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Xu J, Zhao X, Yang S, Tang M, Zhao R, Hu S. Chlorogenic acid and intestinal health: mechanistic insights and therapeutic applications. Food Funct 2025. [PMID: 40357998 DOI: 10.1039/d5fo00853k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2025]
Abstract
Chlorogenic acid (CGA), a polyphenolic compound found in various plant species, has shown considerable potential in the treatment and management of several diseases due to its potent bioactive properties. Increasing evidence indicates that CGA exerts significant antioxidant, anti-inflammatory, and immunomodulatory effects by modulating key signaling pathways, including MAPK, PTEN/Akt, STAT3, and NF-κB/NLRP3. Furthermore, CGA enhances intestinal barrier function and positively influences the gut microbiota composition, making it a promising natural therapeutic agent for conditions such as inflammatory bowel disease, irritable bowel syndrome, and colorectal cancer. This review provides a comprehensive summary of the most recent research on CGA's role in managing intestinal disorders. It first discusses CGA's chemical structure and pharmacokinetics (including absorption and metabolism), followed by an in-depth analysis of the mechanisms through which CGA mediates its therapeutic effects. These insights aim to advance our understanding of CGA's therapeutic potential in treating intestinal diseases.
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Affiliation(s)
- Jinzhao Xu
- College of Food Science, Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, 150030, P. R. China.
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, 130018, P. R. China.
| | - Xiao Zhao
- College of Food Science, Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, 150030, P. R. China.
- College of Equipment Management and Support, Engineering University of PAP, Xi'an, 710086, P. R. China
| | - Shuo Yang
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, 130018, P. R. China.
| | - Mengqi Tang
- College of Food Science, Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, 150030, P. R. China.
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, 130018, P. R. China.
| | - Runan Zhao
- College of Food Science, Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, 150030, P. R. China.
- College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang University, Hangzhou 310058, P. R. China
| | - Shumeng Hu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, 130018, P. R. China.
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Zhai J, Li Y, Liu J, Dai C. Neuroimmune interactions: The bridge between inflammatory bowel disease and the gut microbiota. Clin Transl Med 2025; 15:e70329. [PMID: 40400119 PMCID: PMC12095209 DOI: 10.1002/ctm2.70329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2024] [Revised: 04/16/2025] [Accepted: 04/21/2025] [Indexed: 05/23/2025] Open
Abstract
BACKGROUND The multidimensional regulatory mechanism of the gut-brain-immune axis in the context of inflammatory bowel disease (IBD) has garnered significant attention, particularly regarding how intestinal microbiota finely regulates immune responses through immune cells and sensory neurons. MAIN BODY Metabolites produced by intestinal microbiota influence the phenotype switching of immune cells via complex signalling pathways, thereby modulating their anti-inflammatory and pro-inflammatory functions during intestinal inflammation. Furthermore, sensory neurons exhibit heightened sensitivity to microbial-derived signals, which is essential for preserving intestinal balance and controlling pathological inflammation by integrating peripheral environmental signals with local immune responses. The dynamic equilibrium between immune cells and the neuroimmunoregulation mediated by sensory neurons collectively sustains immune homeostasis within the intestine. However, this coordination mechanism is markedly disrupted under the pathological conditions associated with IBD. CONCLUSION An in-depth exploration of the interactions among immune cells, gut microbiota and sensory neurons may yield significant insights into the pathological mechanisms underlying IBD and guide the creation of new treatment approaches. KEY POINTS The gut microbiota regulates the gut-brain-immune axis, modulating neuroimmune interactions in IBD. Microbiota-derived metabolites influence immune cells, thereby affecting neurons. Neurons secrete mediators, enabling bidirectional neuroimmune communication essential for intestinal homeostasis. Disruptions contribute to IBD, offering therapeutic targets.
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Affiliation(s)
- Jinxia Zhai
- Department of GastroenterologyFirst Affiliated Hospital, China Medical UniversityShenyang CityLiaoning ProvinceChina
| | - Yingjie Li
- Department of GastroenterologyFirst Affiliated Hospital, Jinzhou Medical UniversityJinzhou CityLiaoning ProvinceChina
| | - Jiameng Liu
- Department of GastroenterologyFirst Affiliated Hospital, China Medical UniversityShenyang CityLiaoning ProvinceChina
| | - Cong Dai
- Department of GastroenterologyFirst Affiliated Hospital, China Medical UniversityShenyang CityLiaoning ProvinceChina
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Hu Y, Chen LL, Ye Z, Li LZ, Qian HZ, Wu MQ, Wang J, Qin KH, Ye QB. Indigo naturalis as a potential drug in the treatment of ulcerative colitis: a comprehensive review of current evidence. PHARMACEUTICAL BIOLOGY 2024; 62:818-832. [PMID: 39475104 PMCID: PMC11533244 DOI: 10.1080/13880209.2024.2415652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 08/25/2024] [Accepted: 10/03/2024] [Indexed: 11/06/2024]
Abstract
CONTEXT Ulcerative colitis (UC) is an intractable inflammatory bowel disease that threatens the health of patients. The limited availability of therapeutic strategies makes it imperative to explore more efficient and safer drugs. Indigo naturalis (IN) is a traditional Chinese medicine that possesses many pharmacological activities, including anti-inflammatory, antioxidant, and immunomodulatory activities. The treatment potential of IN for UC has been proven by numerous preclinical and clinical studies in recent years. OBJECTIVE This article provides a comprehensive review of the utility and potential of IN in the treatment of UC. METHODS 'Indigo naturalis' 'Qing dai' 'Qingdai' 'Ulcerative colitis' and 'UC' are used as the keywords, and the relevant literature is collected from online databases (Elsevier, PubMed, and Web of Science). RESULTS AND CONCLUSION Indirubin, indigo, isatin, tryptanthrin, and β-sitosterol are considered the key components in the treatment of UC with IN. Both preclinical and clinical studies support the efficacy of IN for UC, especially in severe UC or in those who do not respond to or have poor efficacy with existing therapies. The mechanisms of IN for UC are associated with the aryl hydrocarbon receptor pathway activation, immune regulation, oxidative stress inhibition, and intestinal microbial modulation. However, the clinical use of IN has the risks of adverse events such as pulmonary hypertension, which suggests the necessity for its rational application. As a potential therapeutic agent for UC that is currently receiving more attention, the clinical value of IN has been initially demonstrated and warrants further evaluation.
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Affiliation(s)
- Yu Hu
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Liu-lin Chen
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Zhen Ye
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Lin-zhen Li
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Huan-zhu Qian
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Ming-quan Wu
- Department of Pharmacy, Sichuan Provincial Orthopedic Hospital, Chengdu, China
| | - Juan Wang
- School of Public Health, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Kai-hua Qin
- Health Preservation and Rehabilitation College, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Qiao-bo Ye
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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Sittipo P, Anggradita LD, Kim H, Lee C, Hwang NS, Lee YK, Hwang Y. Cell Surface Modification-Mediated Primary Intestinal Epithelial Cell Culture Platforms for Assessing Host-Microbiota Interactions. Biomater Res 2024; 28:0004. [PMID: 38327615 PMCID: PMC10845607 DOI: 10.34133/bmr.0004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Accepted: 12/29/2023] [Indexed: 02/09/2024] Open
Abstract
Background: Intestinal epithelial cells (IECs) play a crucial role in regulating the symbiotic relationship between the host and the gut microbiota, thereby allowing them to modulate barrier function, mucus production, and aberrant inflammation. Despite their importance, establishing an effective ex vivo culture method for supporting the prolonged survival and function of primary IECs remains challenging. Here, we aim to develop a novel strategy to support the long-term survival and function of primary IECs in response to gut microbiota by employing mild reduction of disulfides on the IEC surface proteins with tris(2-carboxyethyl)phosphine. Methods: Recognizing the crucial role of fibroblast-IEC crosstalk, we employed a cell surface modification strategy, establishing layer-to-layer contacts between fibroblasts and IECs. This involved combining negatively charged chondroitin sulfate on cell surfaces with a positively charged chitosan thin film between cells, enabling direct intercellular transfer. Validation included assessments of cell viability, efficiency of dye transfer, and IEC function upon lipopolysaccharide (LPS) treatment. Results: Our findings revealed that the layer-by-layer co-culture platform effectively facilitates the transfer of small molecules through gap junctions, providing vital support for the viability and function of primary IECs from both the small intestine and colon for up to 5 days, as evident by the expression of E-cadherin and Villin. Upon LPS treatment, these IECs exhibited a down-regulation of Villin and tight junction genes, such as E-cadherin and Zonula Occludens-1, when compared to their nontreated counterparts. Furthermore, the transcription level of Lysozyme exhibited an increase, while Mucin 2 showed a decrease in response to LPS, indicating responsiveness to bacterial molecules. Conclusions: Our study provides a layer-by-layer-based co-culture platform to support the prolonged survival of primary IECs and their features, which is important for understanding IEC function in response to the gut microbiota.
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Affiliation(s)
- Panida Sittipo
- Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungnam-do 31151, Republic of Korea
| | - Laurensia Danis Anggradita
- Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungnam-do 31151, Republic of Korea
- Department of Integrated Biomedical Science,
Soonchunhyang University, Asan-si, Chungnam-do 31538, Republic of Korea
| | - Hyunbum Kim
- Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungnam-do 31151, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes,
Seoul National University, Seoul 08826, Republic of Korea
| | - Chanyoung Lee
- Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungnam-do 31151, Republic of Korea
- Department of Integrated Biomedical Science,
Soonchunhyang University, Asan-si, Chungnam-do 31538, Republic of Korea
| | - Nathaniel S. Hwang
- School of Chemical and Biological Engineering, Institute of Chemical Processes,
Seoul National University, Seoul 08826, Republic of Korea
- Bio-MAX/N-Bio Institute, Institute of Bio-Engineering,
Seoul National University, Seoul 08826, Republic of Korea
- Institute of Engineering Research,
Seoul National University, Seoul 08826, Republic of Korea
| | - Yun Kyung Lee
- Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungnam-do 31151, Republic of Korea
- Department of Integrated Biomedical Science,
Soonchunhyang University, Asan-si, Chungnam-do 31538, Republic of Korea
| | - Yongsung Hwang
- Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungnam-do 31151, Republic of Korea
- Department of Integrated Biomedical Science,
Soonchunhyang University, Asan-si, Chungnam-do 31538, Republic of Korea
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Shrum SA, Nukala U, Shrimali S, Pineda EN, Krager KJ, Thakkar S, Jones DE, Pathak R, Breen PJ, Aykin-Burns N, Compadre CM. Tocotrienols Provide Radioprotection to Multiple Organ Systems through Complementary Mechanisms of Antioxidant and Signaling Effects. Antioxidants (Basel) 2023; 12:1987. [PMID: 38001840 PMCID: PMC10668991 DOI: 10.3390/antiox12111987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 10/31/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023] Open
Abstract
Tocotrienols have powerful radioprotective properties in multiple organ systems and are promising candidates for development as clinically effective radiation countermeasures. To facilitate their development as clinical radiation countermeasures, it is crucial to understand the mechanisms behind their powerful multi-organ radioprotective properties. In this context, their antioxidant effects are recognized for directly preventing oxidative damage to cellular biomolecules from ionizing radiation. However, there is a growing body of evidence indicating that the radioprotective mechanism of action for tocotrienols extends beyond their antioxidant properties. This raises a new pharmacological paradigm that tocotrienols are uniquely efficacious radioprotectors due to a synergistic combination of antioxidant and other signaling effects. In this review, we have covered the wide range of multi-organ radioprotective effects observed for tocotrienols and the mechanisms underlying it. These radioprotective effects for tocotrienols can be characterized as (1) direct cytoprotective effects, characteristic of the classic antioxidant properties, and (2) other effects that modulate a wide array of critical signaling factors involved in radiation injury.
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Affiliation(s)
- Stephen A. Shrum
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
- Tocol Pharmaceuticals, LLC, Little Rock, AR 77205, USA
| | - Ujwani Nukala
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
- Joint Bioinformatics Graduate Program, University of Arkansas at Little Rock, Little Rock, AR 72204, USA
| | - Shivangi Shrimali
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
- Joint Bioinformatics Graduate Program, University of Arkansas at Little Rock, Little Rock, AR 72204, USA
| | - Edith Nathalie Pineda
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
- Joint Bioinformatics Graduate Program, University of Arkansas at Little Rock, Little Rock, AR 72204, USA
| | - Kimberly J. Krager
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
| | - Shraddha Thakkar
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
| | - Darin E. Jones
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
| | - Rupak Pathak
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
| | - Philip J. Breen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
| | - Nukhet Aykin-Burns
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
| | - Cesar M. Compadre
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (U.N.); (S.S.); (E.N.P.); (K.J.K.); (S.T.); (D.E.J.); (R.P.); (P.J.B.); (N.A.-B.)
- Tocol Pharmaceuticals, LLC, Little Rock, AR 77205, USA
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Wang X, Zeng X, Zhang X, Wei J, Zhang Y, Long F, Yue T, Yuan Y. Aspergillus cristatus attenuates DSS-induced intestinal barrier damage through reducing the oxidative stress, regulating short-chain fatty acid and inhibiting MAPK signaling pathways. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023; 103:1736-1748. [PMID: 36372907 DOI: 10.1002/jsfa.12334] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 10/26/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Probiotics are regarded as a promising strategy for relieving colitis caused by dextran sulfate sodium (DSS). One of the dominant probiotic fungi in Fuzhuan brick tea is identified as Aspergillus cristatus, but whether it can effectively improve colitis remains poorly understood. Here, the improving effect of A. cristatus on colitis was investigated. RESULTS Our results showed that A. cristatus intervention prominently alleviated gut damage as evidenced by the inhibition of shortened colon length, goblet cell depletion, and histological injury. Mechanistically, after administration with low concentrations of A. cristatus H-1 and A. cristatus S-6, the expression of interleukin-6, tumor necrosis factor-α, interleukin-1β, nitric oxide, and malondialdehyde were significantly downregulated, and the content of glutathione, catalase, interleukin-10, immunoglobulin G, claudin-1, occludin, and zonula occludens-1 were effectively upregulated. More importantly, live A. cristatus supplementation lightened DSS-induced gut barrier damage by suppressing activation of the mitogen-activated protein kinase (MAPK) signaling pathway, increasing the synthesis of short-chain fatty acids (SCFAs) and stimulating the increase in peroxisome proliferator-activated receptor γ expression. CONCLUSION Together, A. cristatus can attenuate DSS-induced intestinal barrier damage through reducing the oxidative stress, regulating SCFA and inhibiting MAPK signaling pathways (P38/JNK/ERK). Our findings indicate that A. cristatus replenishment has potential as a new probiotic fungi to reduce DSS-induced colitis. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Xin Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Laboratory of Quality and Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, China
| | - Xuejun Zeng
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Laboratory of Quality and Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, China
| | - Xiao Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Laboratory of Quality and Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, China
| | - Jianping Wei
- College of Food Science and Technology, Northwest University, Xian, China
| | - Yuxiang Zhang
- College of Food Science and Technology, Northwest University, Xian, China
| | - Fangyu Long
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Laboratory of Quality and Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Laboratory of Quality and Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, China
- College of Food Science and Technology, Northwest University, Xian, China
| | - Yahong Yuan
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- Laboratory of Quality and Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, China
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Sinigrin Attenuates the Dextran Sulfate Sodium-induced Colitis in Mice by Modulating the MAPK Pathway. Inflammation 2023; 46:787-807. [PMID: 36622573 DOI: 10.1007/s10753-022-01780-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/09/2022] [Accepted: 12/28/2022] [Indexed: 01/10/2023]
Abstract
Ulcerative colitis (UC) is an intestinal inflammatory disease characterised by the loss of intestinal crypts, edema, mucosal ulceration, and infiltration of inflammatory cells in the mucosa. The current study aimed to investigate the protective and therapeutic effects of sinigrin and underlying mechanisms in a dextran sulfate sodium (DSS)-induced mouse model of ulcerative colitis. DSS-induced colitis models were used to demonstrate sinigrin's therapeutic/protective action. Mice were orally administered with sinigrin (15 mg/kg or 30 mg/kg) for a period of 12 days in both prophylactic and therapeutic models. Animal weights, stool consistency, and bleeding parameters were measured throughout the experimental period. After the experimental period, colon lengths were measured, and colon tissues were harvested to determine the levels of oxidative stress-inducing factors (nitrates and MDA levels) and anti-oxidant components (GSH, SOD, and catalase). Furthermore, gene expression analysis, IL-17 levels, and inflammatory marker expressions were measured using RT-qPCR, ELISA, and immunohistochemical methods respectively. Furthermore, histopathological observations and elucidation of the mechanism of action were determined using H&E analysis and Western blot analysis. Sinigrin treatment (in both prophylactic and therapeutic models) significantly mitigated the DSS-induced body weight loss, attenuated the colon length shrinkage, and improved the disease index score (p < 0.001). Further results revealed that sinigrin's protective/therapeutic effect is associated with a significant attenuation of pro‑inflammatory cytokine production (p < 0.001), reversing the anti-oxidant enzyme levels (p < 0.001) and substantial improvement (2 folds) of the disruption of the colonic morphology in colon tissues compared to DSS control. Immunohistochemical analysis showed that sinigrin treatment remarkably reduced the DSS-induced myeloperoxidase, neutrophil elastase, and CD68 expression in colon tissues. Additionally, sinigrin successfully abrogated the DSS-induced IL-17 levels (p < 0.001) and improved the colonic barrier in colon tissues. Overall, these results demonstrated that sinigrin exerts protective and therapeutic effects on DSS‑induced colitis, by enhancing the anti-oxidant enzymes and suppressing the intestinal inflammatory cascade of markers by regulating the MAPK pathway.
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Gastrointestinal consequences of lipopolysaccharide-induced lung inflammation. Inflamm Res 2023; 72:57-74. [PMID: 36322182 PMCID: PMC9628607 DOI: 10.1007/s00011-022-01657-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 09/15/2022] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Respiratory inflammation is the body's response to lung infection, trauma or hypersensitivity and is often accompanied by comorbidities, including gastrointestinal (GI) symptoms. Why respiratory inflammation is accompanied by GI dysfunction remains unclear. Here, we investigate the effect of lipopolysaccharide (LPS)-induced lung inflammation on intestinal barrier integrity, tight-junctions, enteric neurons and inflammatory marker expression. METHODS Female C57bl/6 mice (6-8 weeks) were intratracheally administered LPS (5 µg) or sterile saline, and assessed after either 24 or 72 h. Total and differential cell counts in bronchoalveolar lavage fluid (BALF) were used to evaluate lung inflammation. Intestinal barrier integrity was assessed via cross sectional immunohistochemistry of tight junction markers claudin-1, claudin-4 and EpCAM. Changes in the enteric nervous system (ENS) and inflammation in the intestine were quantified immunohistochemically using neuronal markers Hu + and nNOS, glial markers GFAP and S100β and pan leukocyte marker CD45. RESULTS Intratracheal LPS significantly increased the number of neutrophils in BALF at 24 and 72 h. These changes were associated with an increase in CD45 + cells in the ileal mucosa at 24 and 72 h, increased goblet cell expression at 24 h, and increased expression of EpCAM at 72 h. LPS had no effect on the expression of GFAP, S100β, nor the number of Hu + neurons or proportion of nNOS neurons in the myenteric plexus. CONCLUSIONS Intratracheal LPS administration induces inflammation in the ileum that is associated with enhanced expression of EpCAM, decreased claudin-4 expression and increased goblet cell density, these changes may contribute to systemic inflammation that is known to accompany many inflammatory diseases of the lung.
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Lee HS, Kim EN, Jeong GS. Ameliorative Effect of Citropten Isolated from Citrusaurantifolia Peel Extract as a Modulator of T Cell and Intestinal Epithelial Cell Activity in DSS-Induced Colitis. Molecules 2022; 27:4633. [PMID: 35889507 PMCID: PMC9321940 DOI: 10.3390/molecules27144633] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 07/18/2022] [Accepted: 07/18/2022] [Indexed: 02/01/2023] Open
Abstract
Citropten is a coumarin that is mainly found in fruits of Rutaceae trees, but its anti-inflammatory activities in colitis is still unknown. In this study, we investigated its attenuating effect of citropten isolated from Citrus aurantifolia extract on DSS-induced colitis through the modulation of the activity of T cells and intestinal epithelial cells. We found that pre-treatment with citropten downregulates the activity of T cells and intestinal epithelial cells without a negative effect on the viability of Jurkat and HT-29 cells. The results from the Western blot analysis revealed that pre-treatment with citropten reduces the NFκB and MAPK signaling pathway in activated T cells and intestinal epithelial cells. We elucidated that the oral administration of citropten alleviates the colonic inflammation and activity of effector T cells in DSS-induced colitis by measuring changes in body weight, histological scoring from H&E-stained sections, mRNA levels of pro-inflammatory cytokines and the phosphorylation level of the MAPK signaling pathway.
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Affiliation(s)
- Hyun-Su Lee
- Department of Physiology, School of Medicine, Daegu Catholic University, Daegu 42472, Korea;
| | - Eun-Nam Kim
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea;
| | - Gil-Saeng Jeong
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea;
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Jenkins BR, Blaseg NA, Grifka-Walk HM, Deuling B, Swain SD, Campbell EL, Walk ST, Kominsky DJ. Loss of interleukin-10 receptor disrupts intestinal epithelial cell proliferation and skews differentiation towards the goblet cell fate. FASEB J 2021; 35:e21551. [PMID: 34042222 DOI: 10.1096/fj.202002369r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 03/02/2021] [Accepted: 03/08/2021] [Indexed: 01/08/2023]
Abstract
Intestinal epithelial cells (IEC) are crucial for maintaining proper digestion and overall homeostasis of the gut mucosa. IEC proliferation and differentiation are tightly regulated by well described pathways, however, relatively little is known about how cytokines shape these processes. Given that the anti-inflammatory cytokine interleukin (IL)-10 promotes intestinal barrier function, and insufficient IL-10 signaling increases susceptibility to intestinal diseases like inflammatory bowel disease, we hypothesized that IL-10 signaling modulates processes underlying IEC proliferation and differentiation. This was tested using in vivo and in vitro IEC-specific IL-10 receptor 1 (IL-10R1) depletion under homeostatic conditions. Our findings revealed that loss of IL-10R1 drove lineage commitment toward a dominant goblet cell phenotype while decreasing absorptive cell-related features. Diminished IL-10 signaling also significantly elevated IEC proliferation with relatively minor changes to apoptosis. Characterization of signaling pathways upstream of proliferation demonstrated a significant reduction in the Wnt inhibitor, DKK1, increased nuclear localization of β-catenin, and increased transcripts of the proliferation marker, OLFM4, with IL-10R1 depletion. Phosphorylated STAT3 was nearly completely absent in IL-10R1 knockdown cells and may provide a mechanistic link between our observations and the regulation of these cellular processes. Our results demonstrate a novel role for IL-10 signaling in intestinal mucosal homeostasis by regulating proper balance of proliferation and IEC lineage fate.
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Affiliation(s)
- Brittany R Jenkins
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
| | - Nathan A Blaseg
- University of South Dakota Sanford School of Medicine, Sioux Falls, SD, USA
| | - Heather M Grifka-Walk
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
| | - Benjamin Deuling
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
| | - Steve D Swain
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
| | - Eric L Campbell
- Centre for Experimental Medicine, Queens University Belfast, Belfast, Northern Ireland
| | - Seth T Walk
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
| | - Douglas J Kominsky
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
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11
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Qu L, Lin X, Liu C, Ke C, Zhou Z, Xu K, Cao G, Liu Y. Atractylodin Attenuates Dextran Sulfate Sodium-Induced Colitis by Alleviating Gut Microbiota Dysbiosis and Inhibiting Inflammatory Response Through the MAPK Pathway. Front Pharmacol 2021; 12:665376. [PMID: 34335244 PMCID: PMC8320761 DOI: 10.3389/fphar.2021.665376] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 04/14/2021] [Indexed: 12/14/2022] Open
Abstract
In this study, we investigated the therapeutic effects and mechanism of atractylodin (ATL) on dextran sulfate sodium (DSS)-induced ulcerative colitis in mice. We found that atractylodin could significantly reverse the effects of DSS-induced ulcerative colitis, such as weight loss, disease activity index score; shorten the colon length, and reverse the pathological changes in the colon of mice. Atractylodin could inhibit the activation of colonic macrophages by inhibiting the MAPK pathway and alleviate intestinal inflammation in the mouse model of ulcerative colitis. Moreover, it could protect the intestinal barrier by inhibiting the decrease of the tight junction proteins, ZO-1, occludin, and MUC2. Additionally, atractylodin could decrease the abundance of harmful bacteria and increase that of beneficial bacteria in the intestinal tract of mice, effectively improving the intestinal microecology. In an LPS-induced macrophage model, atractylodin could inhibit the MAPK pathway and expression of the inflammatory factors of macrophages. Atractylodin could also inhibit the production of lactate, which is the end product of glycolysis; inhibit the activity of GAPDH, which is an important rate-limiting enzyme in glycolysis; inhibit the malonylation of GAPDH, and, thus, inhibit the translation of TNF-α. Therefore, ours is the first study to highlight the potential of atractylodin in the treatment of ulcerative colitis and reveal its possible mechanism.
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Affiliation(s)
- Linghang Qu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China
| | - Xiong Lin
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China
| | - Chunlian Liu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China
| | - Chang Ke
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China
| | - Zhongshi Zhou
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China.,Center for Hubei TCM Processing Technology Engineering, Wuhan, China
| | - Kang Xu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China.,Center for Hubei TCM Processing Technology Engineering, Wuhan, China
| | - Guosheng Cao
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China.,Center for Hubei TCM Processing Technology Engineering, Wuhan, China
| | - Yanju Liu
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China.,Center for Hubei TCM Processing Technology Engineering, Wuhan, China
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12
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Guo Y, Wang B, Wang T, Gao L, Yang ZJ, Wang FF, Shang HW, Hua R, Xu JD. Biological characteristics of IL-6 and related intestinal diseases. Int J Biol Sci 2021; 17:204-219. [PMID: 33390844 PMCID: PMC7757046 DOI: 10.7150/ijbs.51362] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 11/07/2020] [Indexed: 12/21/2022] Open
Abstract
The intestine serves as an important digestive and the largest immune organ in the body. Interleukin-6(IL-6), an important mediator of various pathways, participates in the interactions between different kinds of cells and closely correlates with intestinal physiological and pathological condition. In this review we summarize the signaling pathways of IL-6 and its functions in maintaining intestinal homeostasis. We also explored its relation with nervous system and highlight its potential role in Parkinson's disease. Based on its specialty of the double-side influences on intestinal tumors and inflammation, we summarize how they are done through distinctive process.
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Affiliation(s)
- Yuexin Guo
- Department of Oral Medicine, Basic Medical College, Capital Medical University, Beijing 100069, China
| | - Boya Wang
- Undergraduate Student of 2018 Eight Program of Clinical Medicine, Peking University Health Science Center, Beijing, 100081, China
| | - Tiantian Wang
- Department of Physiology and Pathophysiology, Basic Medical College, Capital Medical University, Beijing 100069, China
| | - Lei Gao
- Department of Bioinformatics, College of Bioengineering, Capital Medical University, Beijing 100069, China
| | - Ze-Jun Yang
- Department of Clinical Medicine, Basic Medical College, Capital Medical University, Beijing 100069, China
| | - Fei-Fei Wang
- Department of Clinical Medicine, Basic Medical College, Capital Medical University, Beijing 100069, China
| | - Hong-Wei Shang
- Experimental Center for Morphological Research Platform, Capital Medical University, Beijing 100069, China
| | - Rongxuan Hua
- Department of Clinical Medicine, Basic Medical College, Capital Medical University, Beijing 100069, China
| | - Jing-Dong Xu
- Department of Physiology and Pathophysiology, Basic Medical College, Capital Medical University, Beijing 100069, China
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13
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Gleeson JP, Fein KC, Chaudhary N, Doerfler R, Newby AN, Whitehead KA. The enhanced intestinal permeability of infant mice enables oral protein and macromolecular absorption without delivery technology. Int J Pharm 2020; 593:120120. [PMID: 33249250 DOI: 10.1016/j.ijpharm.2020.120120] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 11/17/2020] [Accepted: 11/22/2020] [Indexed: 12/14/2022]
Abstract
Oral delivery of macromolecular drugs is the most patient-preferred route of administration because it is painless and convenient. Over the past 30 years, significant attention has been paid to oral protein delivery in adults. Unfortunately, there is an outstanding need for similar efforts in infants, a patient population with distinct intestinal physiology and treatment needs. Here, we assess the intestinal permeability of neonatal and infant mice to determine the feasibility of orally delivering peptide and protein drugs without permeation enhancers or other assistance. Using the non-everted gut sac model, we found that macromolecular permeability depended on molecular size, mouse age, and intestinal tissue type using model dextrans. For example, the apparent permeability of 70 kDa FITC-Dextran (FD70) in infant small intestinal tissue was 2-5-fold higher than in adult tissue. As mice aged, the expression of barrier-forming and pore-forming tight junction proteins increased and decreased, respectively. The in vivo oral absorption of 4 kDa FITC-Dextran (FD4) and FD70 was significantly higher in younger mice, and there was a fourfold increase in oral absorption of the 80 kDa protein lactoferrin compared to adults. Oral gavage of insulin (5 IU/kg) reduced blood glucose levels in infants by >20% at 2 and 3 h but had no effect in adults. Oral insulin had 35% and <1% of the pharmacodynamic effect of a 1 IU/kg subcutaneous dose in infants and adults, as measured by area above the curve. These data indicate that the uniquely leaky nature of the infantile intestine may support the oral delivery of biologics without the need for traditional oral delivery technology.
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Affiliation(s)
- John P Gleeson
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Katherine C Fein
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Namit Chaudhary
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Rose Doerfler
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Alexandra N Newby
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Kathryn A Whitehead
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States.
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14
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Frick A, Khare V, Jimenez K, Dammann K, Lang M, Krnjic A, Gmainer C, Baumgartner M, Mesteri I, Gasche C. A Novel PAK1-Notch1 Axis Regulates Crypt Homeostasis in Intestinal Inflammation. Cell Mol Gastroenterol Hepatol 2020; 11:892-907.e1. [PMID: 33189893 PMCID: PMC7900837 DOI: 10.1016/j.jcmgh.2020.11.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS p21-activated kinase-1 (PAK1) belongs to a family of serine-threonine kinases and contributes to cellular pathways such as nuclear factor-κB (NF-κB), mitogen-activated protein kinase (MAPK), phosphatidylinositol 3-kinase/protein kinase B (PI3K/AKT), and Wingless-related integration site(Wnt)/β-catenin, all of which are involved in intestinal homeostasis. Overexpression of PAK1 is linked to inflammatory bowel disease as well as colitis-associated cancer (CAC), and similarly was observed in interleukin (IL)10 knockout (KO) mice, a model of colitis and CAC. Here, we tested the effects of PAK1 deletion on intestinal inflammation and carcinogenesis in IL10 KO mice. METHODS IL10/PAK1 double-knockout (DKO) mice were generated and development of colitis and CAC was analyzed. Large intestines were measured and prepared for histology or RNA isolation. Swiss rolls were stained with H&E and periodic acid-Schiff. Co-immunoprecipitation and immunofluorescence were performed using intestinal organoids, SW480, and normal human colon epithelial cells 1CT. RESULTS When compared with IL10 KO mice, DKOs showed longer colons and prolonged crypts, despite having higher inflammation and numbers of dysplasia. Crypt hyperproliferation was associated with Notch1 activation and diminished crypt differentiation, indicated by a reduction of goblet cells. Gene expression analysis indicated up-regulation of the Notch1 target hairy and enhancer of split-1 and the stem cell receptor leucin-rich repeat-containing G-protein-coupled receptor 5 in DKO mice. Interestingly, the stem cell marker olfactomedin-4 was present in colonic tissue. Increased β-catenin messenger RNA and cytoplasmic accumulation indicated aberrant Wnt signaling. Co-localization and direct interaction of Notch1 and PAK1 was found in colon epithelial cells. Notch1 activation abrogated this effect whereas silencing of PAK1 led to Notch1 activation. CONCLUSIONS PAK1 contributes to the regulation of crypt homeostasis under inflammatory conditions by controlling Notch1. This identifies a novel PAK1-Notch1 axis in intestinal pathophysiology of inflammatory bowel disease and CAC.
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Affiliation(s)
- Adrian Frick
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Vineeta Khare
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Kristine Jimenez
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Kyle Dammann
- Department of Surgery, Saint Luke's University Hospital Bethlehem, Bethlehem, Pennsylvania
| | - Michaela Lang
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Anita Krnjic
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Christina Gmainer
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Maximilian Baumgartner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | | | - Christoph Gasche
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria.
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15
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Dendrobium huoshanense polysaccharide regulates intestinal lamina propria immune response by stimulation of intestinal epithelial cells via toll-like receptor 4. Carbohydr Polym 2019; 222:115028. [DOI: 10.1016/j.carbpol.2019.115028] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 06/16/2019] [Accepted: 06/25/2019] [Indexed: 12/14/2022]
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16
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Zhu L, Han J, Li L, Wang Y, Li Y, Zhang S. Claudin Family Participates in the Pathogenesis of Inflammatory Bowel Diseases and Colitis-Associated Colorectal Cancer. Front Immunol 2019; 10:1441. [PMID: 31316506 PMCID: PMC6610251 DOI: 10.3389/fimmu.2019.01441] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 06/07/2019] [Indexed: 12/17/2022] Open
Abstract
Claudins are a multigene transmembrane protein family comprising at least 27 members. In gastrointestinal tract, claudins are mainly located in the intestinal epithelia; many types of claudins form a network of strands in tight junction plaques within the intercellular space of neighboring epithelial cells and build paracellular selective channels, while others act as signaling proteins and mediates cell behaviors. Claudin dysfunction may contribute to epithelial permeation disorder and multiple intestinal diseases. Over recent years, the importance of claudins in the pathogenesis of inflammatory bowel diseases (IBD) has gained focus and is being investigated. This review analyzes the expression pattern and regulatory mechanism of claudins based on existing evidence and elucidates the fact that claudin dysregulation correlates with increased intestinal permeability, sustained activation of inflammation, epithelial-to-mesenchymal transition (EMT), and tumor progression in IBD as well as consequent colitis-associated colorectal cancer (CAC), possibly shedding new light on further etiologic research and clinical treatments.
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Affiliation(s)
| | | | | | | | | | - Shenghong Zhang
- Division of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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17
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Garg S, Sadhukhan R, Banerjee S, Savenka AV, Basnakian AG, McHargue V, Wang J, Pawar SA, Ghosh SP, Ware J, Hauer-Jensen M, Pathak R. Gamma-Tocotrienol Protects the Intestine from Radiation Potentially by Accelerating Mesenchymal Immune Cell Recovery. Antioxidants (Basel) 2019; 8:antiox8030057. [PMID: 30845647 PMCID: PMC6466604 DOI: 10.3390/antiox8030057] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/24/2019] [Accepted: 02/28/2019] [Indexed: 12/12/2022] Open
Abstract
Natural antioxidant gamma-tocotrienol (GT3), a vitamin E family member, provides intestinal radiation protection. We seek to understand whether this protection is mediated via mucosal epithelial stem cells or sub-mucosal mesenchymal immune cells. Vehicle- or GT3-treated male CD2F1 mice were exposed to total body irradiation (TBI). Cell death was determined by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay. Villus height and crypt depth were measured with computer-assisted software in tissue sections. Functional activity was determined with an intestinal permeability assay. Immune cell recovery was measured with immunohistochemistry and Western blot, and the regeneration of intestinal crypts was assessed with ex vivo organoid culture. A single dose of GT3 (200 mg/kg body weight (bwt)) administered 24 h before TBI suppressed cell death, prevented a decrease in villus height, increased crypt depth, attenuated intestinal permeability, and upregulated occludin level in the intestine compared to the vehicle treated group. GT3 accelerated mesenchymal immune cell recovery after irradiation, but it did not promote ex vivo organoid formation and failed to enhance the expression of stem cell markers. Finally, GT3 significantly upregulated protein kinase B or AKT phosphorylation after TBI. Pretreatment with GT3 attenuates TBI-induced structural and functional damage to the intestine, potentially by facilitating intestinal immune cell recovery. Thus, GT3 could be used as an intestinal radioprotector.
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Affiliation(s)
- Sarita Garg
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Ratan Sadhukhan
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Sudip Banerjee
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Alena V Savenka
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Alexei G Basnakian
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
- Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA.
| | - Victoria McHargue
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Junru Wang
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Snehalata A Pawar
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Sanchita P Ghosh
- Armed Forces Radiobiology Research Institute, USUHS, Bethesda, MD 20814, USA.
| | - Jerry Ware
- Department of Physiology and Biophysics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Martin Hauer-Jensen
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
| | - Rupak Pathak
- Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
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18
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Dunkin D, Iuga AC, Mimouna S, Harris CL, Haure-Mirande JV, Bozec D, Yeretssian G, Dahan S. Intestinal epithelial Notch-1 protects from colorectal mucinous adenocarcinoma. Oncotarget 2018; 9:33536-33548. [PMID: 30323897 PMCID: PMC6173356 DOI: 10.18632/oncotarget.26086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 08/23/2018] [Indexed: 12/30/2022] Open
Abstract
Increasing evidence links Notch-1 signaling with the maintenance of intestinal architecture and homeostasis. Dysfunction in the common Notch-1 pathway transcription factor recombinant binding protein suppressor of hairless (RBP-J) is associated with loss of epithelial barrier integrity and aberrant conversion of proliferative crypt cells into goblet cells. Furthermore, we have recently discovered that epithelial Notch-1 is indispensable in bridging innate and adaptive immunity in the gut and is required for supporting protective epithelial pro-inflammatory responses. Yet, the epithelial specific function of Notch-1 in intestinal tumorigenesis remains unknown. We generated Villin-Cre/Notch-1fl/fl (VN-/-) mice that are selectively deficient in Notch-1 in intestinal epithelial cells. Intestinal epithelial Notch-1 preserved barrier function and integrity, whereas lack of epithelial Notch-1 induced goblet cell hyperplasia, spontaneous serrated lesions, multifocal low- and high-grade dysplasia and colonic mucinous neoplasms in mice. Over time, VN-/- mice displayed high occurrence of colorectal mucinous adenocarcinomas, which correlated with increased levels of mitogenic, angiogenic and pro-tumorigenic gene expression. Finally, we found that the expression of Notch-1 is significantly reduced in human colorectal mucinous adenocarcinoma when compared to colorectal adenocarcinoma. Taken together, our findings reveal a novel and critical protective role for Notch-1 in controlling intestinal tumorigenesis.
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Affiliation(s)
- David Dunkin
- Department of Pediatric Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Alina C Iuga
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032, USA
| | - Sanda Mimouna
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Immunology and Autoimmunity Research Department, Hospital for Special Surgery Research Institute, New York, NY 10021, USA.,Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Carolyn L Harris
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Division of Rheumatology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jean-Vianney Haure-Mirande
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Dominique Bozec
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Brain Tumor Nanotechnology Laboratory, Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Garabet Yeretssian
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,The Leona M. and Harry B. Helmsley Charitable Trust, New York, NY 10169, USA
| | - Stephanie Dahan
- The Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Division of Clinical Immunology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.,Sobi, Inc. Waltham, MA 02452, USA
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19
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Chew CL, Conos SA, Unal B, Tergaonkar V. Noncoding RNAs: Master Regulators of Inflammatory Signaling. Trends Mol Med 2017; 24:66-84. [PMID: 29246760 DOI: 10.1016/j.molmed.2017.11.003] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 11/13/2017] [Accepted: 11/14/2017] [Indexed: 12/15/2022]
Abstract
Inflammatory signaling underlies many diseases, from arthritis to cancer. Our understanding of inflammation has thus far been limited to the world of proteins, because we are only just beginning to understand the role that noncoding RNAs (ncRNA) might play. It is now clear that ncRNA do not constitute transcriptional 'noise' but instead harbor physiological functions in controlling signaling pathways. In this review, we cover the newly discovered mechanisms and functions of ncRNAs in the regulation of inflammatory signaling. We also describe advances in experimental techniques allowing this field of research to take root. These findings have opened new avenues for putative therapeutic intervention in inflammatory diseases, which may be seen translated into clinical outcomes in the future.
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Affiliation(s)
- Chen Li Chew
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; These authors contributed equally
| | - Stephanie Ana Conos
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; These authors contributed equally
| | - Bilal Unal
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore 117597, Singapore
| | - Vinay Tergaonkar
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore 117597, Singapore; Cancer Science Institute of Singapore, Singapore 117599, Singapore; Centre for Cancer Biology (University of South Australia and SA Pathology), Adelaide, SA 5000, Australia.
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20
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Vitale S, Strisciuglio C, Pisapia L, Miele E, Barba P, Vitale A, Cenni S, Bassi V, Maglio M, Del Pozzo G, Troncone R, Staiano A, Gianfrani C. Cytokine production profile in intestinal mucosa of paediatric inflammatory bowel disease. PLoS One 2017; 12:e0182313. [PMID: 28797042 PMCID: PMC5552230 DOI: 10.1371/journal.pone.0182313] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 07/17/2017] [Indexed: 02/07/2023] Open
Abstract
In the recent years, the incidence of inflammatory bowel disease (IBD) has dramatically increased in young subjects, however, the pathogenesis of paediatric IBD is poorly investigated. In this study we aimed to evaluate the cytokine pattern and the phenotype of cytokine producing cells in the intestinal mucosa of paediatric patients affected by Crohn’s disease (CD) or ulcerative colitis (UC) and of non-IBD healthy controls (HC). Cytokine (IL-15, TNF-α, INF-γ) production was analyzed at basal condition and after mitogen stimulation either intracellularly by flow cytometry or in intestinal cell culture supernatants by enzyme-linked immunosorbent assay (ELISA). A higher frequency of enterocytes (EpCam+ cells) was observed in UC patients compared to CD or HC. An expansion of enterocytes producing IL-15 and TNF-α were found in IBD patients compared to HC. A marked expression of IL-15 in the intestinal epithelium of IBD patients was further confirmed by immunohistochemistry. Myeloid dendritic (CD11c+) cells producing TNF-α and INF-γ were increased in IBD biopsies. Unexpectedly, only after a strong mitogen stimulus, as phytohaemagglutinin, the frequency of CD3+ cells producing IFN-γ was increased in IBD compared to control intestinal mucosa. Interestingly, functional studies performed on organ cultures of intestinal biopsies with neutralizing anti-IL-15 monoclonal antibody showed a marked reduction of mononuclear cell activation, proliferation of crypt enterocytes, as well as a reduction of TNF-α release in organ culture supernatants. In conclusion, we found that in the gut mucosa of IBD children both enterocytes and dendritic cells produce proinflammatory cytokines. The over-expression of IL-15 by enterocytes in IBD intestine and the reduced IBD inflammation by IL-15 blockage suggests that this cytokine could be a therapeutic target in IBD.
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Affiliation(s)
- Serena Vitale
- Institute of Protein Biochemistry, CNR, Naples, Italy
| | - Caterina Strisciuglio
- Department of Woman, Child and General and Specialized Surgery, Second University of Naples, Naples, Italy
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Laura Pisapia
- Institute of Genetics and Biophysics Adriano Buzzati Traverso, CNR, Naples, Italy
| | - Erasmo Miele
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Pasquale Barba
- Institute of Genetics and Biophysics Adriano Buzzati Traverso, CNR, Naples, Italy
| | - Alessandra Vitale
- Department of Woman, Child and General and Specialized Surgery, Second University of Naples, Naples, Italy
| | - Sabrina Cenni
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Virginia Bassi
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Mariantonia Maglio
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Giovanna Del Pozzo
- Institute of Genetics and Biophysics Adriano Buzzati Traverso, CNR, Naples, Italy
| | - Riccardo Troncone
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Annamaria Staiano
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
| | - Carmen Gianfrani
- Institute of Protein Biochemistry, CNR, Naples, Italy
- Department of Translational Medical Science (Section of Paediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
- * E-mail:
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21
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Tsuchiya K, Hayashi R, Fukushima K, Hibiya S, Horita N, Negi M, Itoh E, Akashi T, Eishi Y, Motoya S, Takeuchi Y, Kunisaki R, Fukunaga K, Nakamura S, Yoshimura N, Takazoe M, Iizuka B, Suzuki Y, Nagahori M, Watanabe M. Caudal type homeobox 2 expression induced by leukocytapheresis might be associated with mucosal healing in ulcerative colitis. J Gastroenterol Hepatol 2017; 32:1032-1039. [PMID: 27862316 DOI: 10.1111/jgh.13645] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 10/11/2016] [Accepted: 11/07/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND AIM Ulcerative colitis (UC) is a chronic inflammatory disease of the colon with an intractable, recurrent course. Although the goal of UC therapy has recently been to target mucosal healing, the molecular mechanism of mucosal healing remains unknown. In this study, we aimed to elucidate the molecular dynamics related to the proliferation and differentiation of intestinal epithelial cells during cytapheresis therapy in a short duration. METHODS Endoscopy was performed in 26 patients with UC in multicentre hospitals, and biopsy specimens were collected from the rectum before and within two weeks after leukocytapheresis (LCAP). The expression of representative proteins in intestinal epithelial cells and pathological findings was compared before and after LCAP. RESULTS The expression of caudal type homeobox 2 (CDX2) and a hes family bHLH transcription factor 1(HES1) markedly increased after LCAP. Patients with endoscopic improvement after LCAP showed the expression of CDX2 before LCAP. Moreover, the number of goblet cells significantly increased after LCAP. Patients without endoscopic improvement after LCAP did not show the expression of CDX2 before LCAP. However, the expression of CDX2 markedly increased after LCAP. CONCLUSION This study suggests that cytapheresis might induce CDX2 expression without affecting the cell proliferation, thus resulting in mucosal healing with goblet cell restoration.
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Affiliation(s)
- Kiichiro Tsuchiya
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
| | - Ryohei Hayashi
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan.,Endoscopy and Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Keita Fukushima
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shuji Hibiya
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
| | - Nobukatsu Horita
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
| | - Mariko Negi
- Department of Pathology, Graduate School Tokyo Medical and Dental University, Tokyo, Japan
| | - Eisaku Itoh
- Department of Pathology, Graduate School Tokyo Medical and Dental University, Tokyo, Japan
| | - Takumi Akashi
- Department of Pathology, Graduate School Tokyo Medical and Dental University, Tokyo, Japan
| | - Yoshinobu Eishi
- Department of Pathology, Graduate School Tokyo Medical and Dental University, Tokyo, Japan
| | - Satoshi Motoya
- IBD Center, Sapporo Kosei General Hospital, Sapporo, Japan
| | - Yoshiaki Takeuchi
- Department of Medicine, Division of Gastroenterology, Showa University School of Medicine, Tokyo, Japan
| | - Reiko Kunisaki
- Yokohama City University Medical Center, Yokohama, Japan
| | - Ken Fukunaga
- Department of Inflammatory Bowel Disease, Division of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan
| | - Shiro Nakamura
- Department of Inflammatory Bowel Disease, Division of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan
| | | | | | | | - Yasuo Suzuki
- Toho University Medical Center Sakura Hospital, Shimoshizu, Japan
| | - Masakazu Nagahori
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
| | - Mamoru Watanabe
- Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
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22
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23
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Nandipati KC, Subramanian S, Agrawal DK. Protein kinases: mechanisms and downstream targets in inflammation-mediated obesity and insulin resistance. Mol Cell Biochem 2016; 426:27-45. [PMID: 27868170 DOI: 10.1007/s11010-016-2878-8] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 11/07/2016] [Indexed: 12/23/2022]
Abstract
Obesity-induced low-grade inflammation (metaflammation) impairs insulin receptor signaling. This has been implicated in the development of insulin resistance. Insulin signaling in the target tissues is mediated by stress kinases such as p38 mitogen-activated protein kinase, c-Jun NH2-terminal kinase, inhibitor of NF-kB kinase complex β (IKKβ), AMP-activated protein kinase, protein kinase C, Rho-associated coiled-coil containing protein kinase, and RNA-activated protein kinase. Most of these kinases phosphorylate several key regulators in glucose homeostasis. The phosphorylation of serine residues in the insulin receptor and IRS-1 molecule results in diminished enzymatic activity in the phosphatidylinositol 3-kinase (PI3K)/Akt pathway. This has been one of the key mechanisms observed in the tissues that are implicated in insulin resistance especially in type 2 diabetes mellitus (T2-DM). Identifying the specific protein kinases involved in obesity-induced chronic inflammation may help in developing the targeted drug therapies to minimize the insulin resistance. This review is focused on the protein kinases involved in the inflammatory cascade and molecular mechanisms and their downstream targets with special reference to obesity-induced T2-DM.
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Affiliation(s)
- Kalyana C Nandipati
- Department of Surgery, Creighton University School of Medicine, 601 N. 30th Street, Suite # 3700, Omaha, NE, 68131, USA.
- Department of Clinical & Translational Science, Creighton University School of Medicine, 2500, California Plaza, Room # 510, Criss II, Omaha, NE, 68131, USA.
| | - Saravanan Subramanian
- Department of Clinical & Translational Science, Creighton University School of Medicine, 2500, California Plaza, Room # 510, Criss II, Omaha, NE, 68131, USA
| | - Devendra K Agrawal
- Department of Clinical & Translational Science, Creighton University School of Medicine, 2500, California Plaza, Room # 510, Criss II, Omaha, NE, 68131, USA
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Geng X, Xue J. Expression of Treg/Th17 cells as well as related cytokines in patients with inflammatory bowel disease. Pak J Med Sci 2016; 32:1164-1168. [PMID: 27882014 PMCID: PMC5103126 DOI: 10.12669/pjms.325.10902] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVE To investigate the expressions of peripheral regulatory T cells (Treg) and T helper cells (Th17) as well as related cytokines in peripheral blood of patients with inflammatory bowel disease (IBD). METHODS One hundred four cases of IBD patients admitted in our hospital were selected for this study. One hundred cases of people receiving healthy physical examination were included in the control group in the corresponding period. The levels of CD4+CD25+Treg and Th17 subsets were analyzed in peripheral blood of two groups using flow cytometry. The expressions of IL-10, TGF-β1, IL-17 and IL-23 mRNA and protein were detected using real-time fluorescence quantitative PCR and ELISA. RESULTS Compared with the control group, the proportion of Treg in peripheral blood was decreased significantly in observation group (P<0.05), the proportion of Th17 cells was increased significantly (P<0.05), and Treg/Th17 was decreased significantly (P<0.05). Compared with the control group, the expressions of IL-10 and TGF-β1 mRNA and protein in peripheral blood of patients were significantly down-regulated in observation group, while the expressions of Th17 cytokines IL-17 and IL-23 mRNA and protein were significantly increased (P<0.05). CONCLUSION The proportion of Th17 and increased cytokine level suggested the inflammatory level was higher in IBD patients. The down regulations of Treg and cytokine suggested that the immunosuppression function was down-regulated in IBD patients, and the disproportionality might be one of the mechanisms of IBD.
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Affiliation(s)
- Xianhui Geng
- Xianhui Geng, Department of Gastroenterology, PLA 153rd Central Hospital, Zhengzhou 450042, China
| | - Jie Xue
- Jie Xue, Department of Ultrasonography, Zhengzhou People's Hospital, Zhengzhou 450003, China
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25
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Maoa R, Zou F, Yang L, Lin S, Li Y, Ma M, Yin P, Liang X, Liu J. The loss of MiR-139-5p promotes colitis-associated tumorigenesis by mediating PI3K/AKT/Wnt signaling. Int J Biochem Cell Biol 2016; 69:153-61. [PMID: 27022656 DOI: 10.1016/j.biocel.2015.10.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
MiR-139-5p down-regulation has frequently been implicated in colorectal carcinoma. However, there is little known about its biological function between inflammation and cancer in vivo. Here, a transgenic murine model of colorectal carcinoma was used to investigate pathogenetic role of miR-139-5p in colitis and colitis-associated tumorigenesis. We showed that miR-139-5p knockout mice were higher sensitive to DSS-induced colitis and enhanced formation of intestinal neoplasia was observed when mice were exposed to AOM/DSS treatment. MiR-139-5p knockout mice exhibited an increased expression of genes involved in Wnt pathway. Such genes are closely associated with cell proliferation and differentiation, promoting the β-catenin nuclear accumulation. Furthermore, biochemical studies in HCT-116 cells revealed that the over-expression of miR-139-5p inhibited the crosstalk between PI3K/AKT and Wnt pathway mediated by IGF-1R. Collectively, these findings indicate that miR-139-5p plays a crucial role in the development and progression of colitis-associated tumorigenesis and suggest that miR-139-5p may serve as a potential therapeutic target for the treatment of colitis-associated cancer in the future.
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26
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Ratanasirintrawoot S, Israsena N. Stem Cells in the Intestine: Possible Roles in Pathogenesis of Irritable Bowel Syndrome. J Neurogastroenterol Motil 2016; 22:367-82. [PMID: 27184041 PMCID: PMC4930294 DOI: 10.5056/jnm16023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 03/08/2016] [Indexed: 12/13/2022] Open
Abstract
Irritable bowel syndrome is one of the most common functional gastrointestinal (GI) disorders that significantly impair quality of life in patients. Current available treatments are still not effective and the pathophysiology of this condition remains unclearly defined. Recently, research on intestinal stem cells has greatly advanced our understanding of various GI disorders. Alterations in conserved stem cell regulatory pathways such as Notch, Wnt, and bone morphogenic protein/TGF-β have been well documented in diseases such as inflammatory bowel diseases and cancer. Interaction between intestinal stem cells and various signals from their environment is important for the control of stem cell self-renewal, regulation of number and function of specific intestinal cell types, and maintenance of the mucosal barrier. Besides their roles in stem cell regulation, these signals are also known to have potent effects on immune cells, enteric nervous system and secretory cells in the gut, and may be responsible for various aspects of pathogenesis of functional GI disorders, including visceral hypersensitivity, altered gut motility and low grade gut inflammation. In this article, we briefly summarize the components of these signaling pathways, how they can be modified by extrinsic factors and novel treatments, and provide evidenced support of their roles in the inflammation processes. Furthermore, we propose how changes in these signals may contribute to the symptom development and pathogenesis of irritable bowel syndrome.
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Affiliation(s)
- Sutheera Ratanasirintrawoot
- Stem Cell and Cell Therapy Research Unit, Chulalongkorn University, Bangkok, Thailand.,Department of Research Affairs, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Nipan Israsena
- Stem Cell and Cell Therapy Research Unit, Chulalongkorn University, Bangkok, Thailand.,Department of Pharmacology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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27
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Wen YA, Li X, Goretsky T, Weiss HL, Barrett TA, Gao T. Loss of PHLPP protects against colitis by inhibiting intestinal epithelial cell apoptosis. Biochim Biophys Acta Mol Basis Dis 2015; 1852:2013-23. [PMID: 26187040 DOI: 10.1016/j.bbadis.2015.07.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 07/10/2015] [Accepted: 07/13/2015] [Indexed: 12/12/2022]
Abstract
A common feature of inflammatory bowel disease (IBD) is the loss of intestinal epithelial barrier function due to excessive apoptosis of intestinal epithelial cells (IECs). However, the molecular mechanism underlying increased IEC apoptosis remains unclear. Here, we investigated the role of PHLPP, a novel family of protein phosphatases, in regulating inflammation-induced IEC apoptosis in mouse models of colitis. Both Phlpp1 and Phlpp2 genes were deleted in mice. Compared with wild-type mice, PHLPP double knockout (DKO) mice were protected from colitis induced by DSS as demonstrated by lower histopathological scores, and this reduced susceptibility to colitis was associated with decreased apoptosis and increased Akt activity in IECs in vivo. In addition, epithelial organoids derived from PHLPP DKO mice were more resistant to inflammation-induced apoptosis while inhibition of Akt activity abolished the protective effect of PHLPP-loss. Furthermore, we found that PHLPP expression was significantly reduced in IECs following the induction of colitis by DSS and in human IBD patient samples. This inflammation-induced downregulation of PHLPP was partially blocked by treating cells with a proteasome inhibitor. Taken together, our results indicated that proteasome-mediated degradation of PHLPP at the onset of inflammation plays an important role in protecting IEC injury by inhibiting apoptosis.
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Affiliation(s)
- Yang-An Wen
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536-0509, USA
| | - Xin Li
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536-0509, USA
| | - Tatiana Goretsky
- Division of Digestive Diseases and Nutrition, Department of Internal Medicine, University of Kentucky, Lexington, KY 40536-0509, USA
| | - Heidi L Weiss
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536-0509, USA
| | - Terrence A Barrett
- Division of Digestive Diseases and Nutrition, Department of Internal Medicine, University of Kentucky, Lexington, KY 40536-0509, USA
| | - Tianyan Gao
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536-0509, USA; Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536-0509, USA.
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28
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Yang L, Yan Y. Protein kinases are potential targets to treat inflammatory bowel disease. World J Gastrointest Pharmacol Ther 2014; 5:209-217. [PMID: 25374761 PMCID: PMC4218950 DOI: 10.4292/wjgpt.v5.i4.209] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Revised: 04/05/2014] [Accepted: 07/29/2014] [Indexed: 02/06/2023] Open
Abstract
Protein kinases play a crucial role in the pathogenesis of inflammatory bowel disease (IBD), the two main forms of which are ulcerative colitis and Crohn’s disease. In this article, we will review the mechanisms of involvement of protein kinases in the pathogenesis of and intervention against IBD, in terms of their effects on genetics, microbiota, mucous layer and tight junction, and the potential of protein kinases as therapeutic targets against IBD.
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29
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Mouse and human Notch-1 regulate mucosal immune responses. Mucosal Immunol 2014; 7:995-1005. [PMID: 24424521 DOI: 10.1038/mi.2013.118] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Accepted: 11/22/2013] [Indexed: 02/04/2023]
Abstract
The Notch-1 signaling pathway is responsible for homeostatic tight junction expression in vitro, and promotes barrier function in vivo in the RAG1-adoptive transfer model of colitis. In this study, we sought to determine the role of colonic Notch-1 in the lymphoepithelial crosstalk in health and disease. We utilized in vivo and in vitro knockdown to target the expression of Notch-1. We identified that epithelial Notch-1 is required for appropriate activation of intestinal epithelial cells at steady state and upon inflammatory stimulus. Notch-1 expression modulates mucosal chemokine and cytokine secretion, and FoxP3 and effector T-cell responses. We showed that epithelial Notch-1 controls the immune function of the epithelium through crosstalk with the nuclear factor-κB (NF-κB)/mitogen-activated protein kinase (MAPK) pathways that, in turn, elicits T-cell responses. Overall, epithelial Notch-1 bridges innate and adaptive immunity in the gut. Our findings highlight an indispensable role for Notch-1-mediated signaling in the intricate epithelial-immune crosstalk, and validate that epithelial Notch-1 is necessary and sufficient to support protective epithelial proinflammatory responses.
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30
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Mahajan S, Liao M, Barkan P, Takahashi K, Bhargava A. Urocortin 3 expression at baseline and during inflammation in the colon: corticotropin releasing factor receptors cross-talk. Peptides 2014; 54:58-66. [PMID: 24462512 PMCID: PMC4006935 DOI: 10.1016/j.peptides.2014.01.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/11/2014] [Accepted: 01/13/2014] [Indexed: 02/07/2023]
Abstract
Urocortins (Ucn1-3), members of the corticotropin-releasing factor (CRF) family of neuropeptides, are emerging as potent immunomodulators. Localized, cellular expression of Ucn1 and Ucn2, but not Ucn3, has been demonstrated during inflammation. Here, we investigated the role of Ucn3 in a rat model of Crohn's colitis and the relative contribution of CRF receptors (CRF1 and CRF2) in regulating Ucn3 expression at baseline and during inflammation. Ucn3 mRNA and peptide were ubiquitously expressed throughout the GI tract in naïve rats. Ucn3 immunoreactivity was seen in epithelial cells and myenteric neurons. On day 1 of colitis, Ucn3 mRNA levels decreased by 80% and did not recover to baseline even by day 9. Next, we ascertained pro- or anti-inflammatory actions of Ucn3 during colitis. Surprisingly, unlike observed anti-inflammatory actions of Ucn1, exogenous Ucn3 did not alter histopathological outcomes during colitis and neither did it alter levels of pro-inflammatory cytokines IL-6 and TNF-α. At baseline, colon-specific knockdown of CRF1, but not CRF2 decreased Ucn3 mRNA by 78%, whereas during colitis, Ucn3 mRNA levels increased after CRF1 knockdown. In cultured cells, co-expression of CRF1+CRF2 attenuated Ucn3-stimulated intracellular Ca(2+) peak by 48% as compared to cells expressing CRF2 alone. Phosphorylation of p38 kinase increased by 250% during colitis and was significantly attenuated after Ucn3 administration. Thus, our results suggest that a balanced and coordinated expression of CRF receptors is required for proper regulation of Ucn3 at baseline and during inflammation.
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Affiliation(s)
- Shilpi Mahajan
- Department of Surgery, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA
| | - Min Liao
- Department of Surgery, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA
| | - Paris Barkan
- Department of Surgery, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA; Jefferson Medical College, 1025 Walnut Street, Philadelphia, PA 19107, USA(1)
| | - Kazuhiro Takahashi
- Department of Endocrinology and Applied Medical Science, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan
| | - Aditi Bhargava
- Department of Surgery, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA.
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Lee IA, Kamba A, Low D, Mizoguchi E. Novel methylxanthine derivative-mediated anti-inflammatory effects in inflammatory bowel disease. World J Gastroenterol 2014; 20:1127-38. [PMID: 24574789 PMCID: PMC3921497 DOI: 10.3748/wjg.v20.i5.1127] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 11/26/2013] [Accepted: 01/06/2014] [Indexed: 02/06/2023] Open
Abstract
Family 18 chitinases have a binding capacity with chitin, a polymer of N-acetylglucosamine. Recent studies strongly suggested that chitinase 3-like 1 (CHI3L1, also known as YKL-40) and acidic mammalian chitinase, the two major members of family 18 chitinases, play a pivotal role in the pathogenesis of inflammatory bowel disease (IBD), bronchial asthma and several other inflammatory disorders. Based on the data from high-throughput screening, it has been found that three methylxanthine derivatives, caffeine, theophylline, and pentoxifylline, have competitive inhibitory effects against a fungal family 18 chitinase by specifically interacting with conserved tryptophans in the active site of this protein. Methylxanthine derivatives are also known as adenosine receptor antagonists, phosphodiesterase inhibitors and histone deacetylase inducers. Anti-inflammatory effects of methylxanthine derivatives have been well-documented in the literature. For example, a beneficial link between coffee or caffeine consumption and type 2 diabetes as well as liver cirrhosis has been reported. Furthermore, theophylline has a long history of being used as a bronchodilator in asthma therapy, and pentoxifylline has an immuno-modulating effect for peripheral vascular disease. However, it is still largely unknown whether these methylxanthine derivative-mediated anti-inflammatory effects are associated with the inhibition of CHI3L1-induced cytoplasmic signaling cascades in epithelial cells. In this review article we will examine the above possibility and summarize the biological significance of methylxanthine derivatives in intestinal epithelial cells. We hope that this study will provide a rationale for the development of methylxanthine derivatives, in particular caffeine, -based anti-inflammatory therapeutics in the field of IBD and IBD-associated carcinogenesis.
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Khan RI, Yazawa T, Anisuzzaman ASM, Semba S, Ma Y, Uwada J, Hayashi H, Suzuki Y, Ikeuchi H, Uchino M, Maemoto A, Muramatsu I, Taniguchi T. Activation of focal adhesion kinase via M1 muscarinic acetylcholine receptor is required in restitution of intestinal barrier function after epithelial injury. Biochim Biophys Acta Mol Basis Dis 2013; 1842:635-45. [PMID: 24365239 DOI: 10.1016/j.bbadis.2013.12.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 11/26/2013] [Accepted: 12/16/2013] [Indexed: 12/24/2022]
Abstract
Impairment of epithelial barrier is observed in various intestinal disorders including inflammatory bowel diseases (IBD). Numerous factors may cause temporary damage of the intestinal epithelium. A complex network of highly divergent factors regulates healing of the epithelium to prevent inflammatory response. However, the exact repair mechanisms involved in maintaining homeostatic intestinal barrier integrity remain to be clarified. In this study, we demonstrate that activation of M1 muscarinic acetylcholine receptor (mAChR) augments the restitution of epithelial barrier function in T84 cell monolayers after ethanol-induced epithelial injury, via ERK-dependent phosphorylation of focal adhesion kinase (FAK). We have shown that ethanol injury decreased the transepithelial electrical resistance (TER) along with the reduction of ERK and FAK phosphorylation. Carbachol (CCh) increased ERK and FAK phosphorylation with enhanced TER recovery, which was completely blocked by either MT-7 (M1 antagonist) or atropine. The CCh-induced enhancement of TER recovery was also blocked by either U0126 (ERK pathway inhibitor) or PF-228 (FAK inhibitor). Treatment of T84 cell monolayers with interferon-γ (IFN-γ) impaired the barrier function with the reduction of FAK phosphorylation. The CCh-induced ERK and FAK phosphorylation were also attenuated by the IFN-γ treatment. Immunological and binding experiments exhibited a significant reduction of M1 mAChR after IFN-γ treatment. The reduction of M1 mAChR in inflammatory area was also observed in surgical specimens from IBD patients, using immunohistochemical analysis. These findings provide important clues regarding mechanisms by which M1 mAChR participates in the maintenance of intestinal barrier function under not only physiological but also pathological conditions.
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Affiliation(s)
- Rafiqul Islam Khan
- Division of Cellular Signal Transduction, Department of Biochemistry, Asahikawa Medical University, Asahikawa, Japan; Department of Pharmacy, University of Rajshahi, Rajshahi, Bangladesh
| | - Takashi Yazawa
- Division of Cellular Signal Transduction, Department of Biochemistry, Asahikawa Medical University, Asahikawa, Japan
| | | | - Shingo Semba
- Division of Cellular Signal Transduction, Department of Biochemistry, Asahikawa Medical University, Asahikawa, Japan
| | - Yanju Ma
- Department of Medical Oncology, The First Hospital of China Medical University, Shenyang, China
| | - Junsuke Uwada
- Division of Pharmacology, Department of Biochemistry and Bioinformative Sciences, University of Fukui, Fukui, Japan
| | - Hisayoshi Hayashi
- Laboratory of Physiology, School of Food and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
| | - Yuichi Suzuki
- Laboratory of Physiology, School of Food and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan; Division of Health and Nutrition, Sendai Shirayuri Women's College, Sendai, Japan
| | - Hiroki Ikeuchi
- Inflammatory Bowel Disease Center, Hyogo College of Medicine, Nishinomiya, Japan
| | - Motoi Uchino
- Inflammatory Bowel Disease Center, Hyogo College of Medicine, Nishinomiya, Japan
| | - Atsuo Maemoto
- Department of Gastrointestinal Immunology and Regenerative Medicine, Asahikawa Medical University, Asahikawa, Japan; Inflammatory Bowel Disease Center, Sapporo Higashi Tokushukai Hospital, Sapporo, Japan
| | - Ikunobu Muramatsu
- Division of Pharmacology, Department of Biochemistry and Bioinformative Sciences, University of Fukui, Fukui, Japan; Organization for Life Science Advancement Programs, University of Fukui, Fukui, Japan; Research Center for Child Mental Development, University of Fukui, Fukui, Japan
| | - Takanobu Taniguchi
- Division of Cellular Signal Transduction, Department of Biochemistry, Asahikawa Medical University, Asahikawa, Japan.
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Cosín-Roger J, Ortiz-Masiá D, Calatayud S, Hernández C, Álvarez A, Hinojosa J, Esplugues JV, Barrachina MD. M2 macrophages activate WNT signaling pathway in epithelial cells: relevance in ulcerative colitis. PLoS One 2013; 8:e78128. [PMID: 24167598 PMCID: PMC3805515 DOI: 10.1371/journal.pone.0078128] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 09/09/2013] [Indexed: 12/13/2022] Open
Abstract
Macrophages, which exhibit great plasticity, are important components of the inflamed tissue and constitute an essential element of regenerative responses. Epithelial Wnt signalling is involved in mechanisms of proliferation and differentiation and expression of Wnt ligands by macrophages has been reported. We aim to determine whether the macrophage phenotype determines the expression of Wnt ligands, the influence of the macrophage phenotype in epithelial activation of Wnt signalling and the relevance of this pathway in ulcerative colitis. Human monocyte-derived macrophages and U937-derived macrophages were polarized towards M1 or M2 phenotypes and the expression of Wnt1 and Wnt3a was analyzed by qPCR. The effects of macrophages and the role of Wnt1 were analyzed on the expression of β-catenin, Tcf-4, c-Myc and markers of cell differentiation in a co-culture system with Caco-2 cells. Immunohistochemical staining of CD68, CD206, CD86, Wnt1, β-catenin and c-Myc were evaluated in the damaged and non-damaged mucosa of patients with UC. We also determined the mRNA expression of Lgr5 and c-Myc by qPCR and protein levels of β-catenin by western blot. Results show that M2, and no M1, activated the Wnt signaling pathway in co-culture epithelial cells through Wnt1 which impaired enterocyte differentiation. A significant increase in the number of CD206+ macrophages was observed in the damaged mucosa of chronic vs newly diagnosed patients. CD206 immunostaining co-localized with Wnt1 in the mucosa and these cells were associated with activation of canonical Wnt signalling pathway in epithelial cells and diminution of alkaline phosphatase activity. Our results show that M2 macrophages, and not M1, activate Wnt signalling pathways and decrease enterocyte differentiation in co-cultured epithelial cells. In the mucosa of UC patients, M2 macrophages increase with chronicity and are associated with activation of epithelial Wnt signalling and diminution in enterocyte differentiation.
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Affiliation(s)
- Jesús Cosín-Roger
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - Dolores Ortiz-Masiá
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
- * E-mail:
| | - Sara Calatayud
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | | | - Angeles Álvarez
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | | | - Juan V. Esplugues
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
- FISABIO, Hospital Dr. Peset, Valencia, Spain
| | - Maria D. Barrachina
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
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Antioxidant properties of mesalamine in colitis inhibit phosphoinositide 3-kinase signaling in progenitor cells. Inflamm Bowel Dis 2013; 19:2051-60. [PMID: 23867870 PMCID: PMC8754500 DOI: 10.1097/mib.0b013e318297d741] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Mesalamine, 5-aminosalicylic acid (5-ASA), is a potent antioxidant and is known to enhance peroxisome proliferator-activated receptor γ activity in the intestine. Our previous studies suggested reduced Phosphoinositide 3-Kinase (PI3K)/β-catenin signaling as a mechanism for 5-ASA chemoprevention in chronic ulcerative colitis (CUC). We now hypothesize that 5-ASA mediates changes in intestinal epithelial cell (IEC) reactive oxygen species during colitis to affect phosphatase and tensin homolog (PTEN), PI3K, and β-catenin signaling. METHODS Here, we examined effects of 5-ASA on oxidant-induced cell signaling pathways in HT-29 cells, IECs from mice, and biopsy tissue from control and CUC patients. Samples were selected to control for inflammation between untreated and 5-ASA-treated CUC patients. RESULTS Direct evaluation of IEC in H2O2-stimulated whole colonic crypts indicated that 5-ASA reduces reactive oxygen species levels in lower crypt IECs where long-lived progenitor cells reside. Analysis of biopsies from patient samples revealed that 5-ASA increases expression of the antioxidant catalase in CUC patients. Also, 5-ASA increased nuclear peroxisome proliferator-activated receptor γ protein and target gene expression. Data showed 5-ASA-induced peroxisome proliferator-activated receptor γ DNA binding to the PTEN promoter (chromatin immunoprecipitation) and reduced both phosphorylated and oxidized (inactive) PTEN protein levels. Analysis of patient samples revealed 5-ASA that also reduced levels of active phosphorylated Akt in inflamed colitis tissue. Reduced PI3K/Akt signaling and expression of β-catenin target genes in 5-ASA-treated CUC patients additionally suggests enhanced PTEN activity as well. CONCLUSIONS Therefore, 5-ASA reduces CUC-induced reactive oxygen species in colonic progenitor cells and enhances PTEN activity, thus attenuating PI3K/Akt signaling. These data suggest that the antioxidant properties of 5-ASA may be the predominant mechanism for 5-ASA chemoprevention.
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Miyasaka EA, Feng Y, Poroyko V, Falkowski NR, Erb-Downward J, Gillilland MG, Mason KL, Huffnagle GB, Teitelbaum DH. Total parenteral nutrition-associated lamina propria inflammation in mice is mediated by a MyD88-dependent mechanism. THE JOURNAL OF IMMUNOLOGY 2013; 190:6607-15. [PMID: 23667106 DOI: 10.4049/jimmunol.1201746] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Enteral nutrient deprivation via total parenteral nutrition (TPN) administration leads to local mucosal inflammatory responses, but the underlying mechanisms are unknown. Wild-type (WT) and MyD88(-/-) mice underwent jugular vein cannulation. One group received TPN without chow, and controls received standard chow. After 7 d, we harvested intestinal mucosally associated bacteria and isolated small-bowel lamina propria (LP) cells. Bacterial populations were analyzed using 454 pyrosequencing. LP cells were analyzed using quantitative PCR and multicolor flow cytometry. WT, control mucosally associated microbiota were Firmicutes-dominant, whereas WT TPN mice were Proteobacteria-domiant. Similar changes were observed in MyD88(-/-) mice with TPN administration. UniFrac analysis showed divergent small bowel and colonic bacterial communities in controls, merging toward similar microbiota (but distinct from controls) with TPN. The percentage of LP T regulatory cells significantly decreased with TPN in WT mice. F4/80(+)CD11b(+)CD11c(dull/-) macrophage-derived proinflammatory cytokines significantly increased with TPN. These proinflammatory immunologic changes were significantly abrogated in MyD88(-/-) TPN mice. Thus, TPN administration is associated with significant expansion of Proteobacteria within the intestinal microbiota and increased proinflammatory LP cytokines. Additionally, MyD88 signaling blockade abrogated decline in epithelial cell proliferation and epithelial barrier function loss.
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Affiliation(s)
- Eiichi A Miyasaka
- Section of Pediatric Surgery, Department of Surgery, University of Michigan, Ann Arbor, MI 48109, USA
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Abstract
The epithelium of the gastrointestinal tract, which represents the largest surface area of the body, is constantly exposed to the contents of its surrounding environment. The intestinal epithelium forms barriers that are essential in maintaining equilibrium within the human body. This barrier supports nutrient and water transport while preventing microbial invasion. Intestinal epithelial cells (IECs) sit at the interface between an antigen-rich lumen and a lymphocyte-rich lamina propria (LP). IECs have the capability to discriminate between "peaceful" and "harmful" antigens. The epithelium is constantly sampling luminal contents and making molecular adjustments accordingly. These molecular changes influence the actions of innate and adaptive immune cells. The crosstalk that occurs between the epithelium and the immune compartments serves to maintain intestinal homeostasis. A better understanding of the nature of the interactions between normal LP lymphocytes (LPLs) and IECs will ultimately provide insights into the defects occurring in inflammatory bowel disease patients.
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Vanuytsel T, Senger S, Fasano A, Shea-Donohue T. Major signaling pathways in intestinal stem cells. Biochim Biophys Acta Gen Subj 2012; 1830:2410-26. [PMID: 22922290 DOI: 10.1016/j.bbagen.2012.08.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 07/05/2012] [Accepted: 08/07/2012] [Indexed: 12/12/2022]
Abstract
BACKGROUND The discovery of markers to identify the intestinal stem cell population and the generation of powerful transgenic mouse models to study stem cell physiology have led to seminal discoveries in stem cell biology. SCOPE OF REVIEW In this review we give an overview of the current knowledge in the field of intestinal stem cells (ISCs) highlighting the most recent progress on markers defining the ISC population and pathways governing intestinal stem cell maintenance and differentiation. Furthermore we review their interaction with other stem cell related pathways. Finally we give an overview of alteration of these pathways in human inflammatory gastrointestinal diseases. MAJOR CONCLUSIONS We highlight the complex network of interactions occurring among different pathways and put in perspective the many layers of regulation that occur in maintaining the intestinal homeostasis. GENERAL SIGNIFICANCE Understanding the involvement of ISCs in inflammatory diseases can potentially lead to new therapeutic approaches to treat inflammatory GI pathologies such as IBD and celiac disease and could reveal the molecular mechanisms leading to the pathogenesis of dysplasia and cancer in inflammatory chronic conditions. This article is part of a Special Issue entitled Biochemistry of Stem Cells.
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Affiliation(s)
- Tim Vanuytsel
- Mucosal Biology Research Center, University of Maryland School of Medicine, Baltimore, MD, USA
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Thomson ABR, Chopra A, Clandinin MT, Freeman H. Recent advances in small bowel diseases: Part I. World J Gastroenterol 2012; 18:3336-52. [PMID: 22807604 PMCID: PMC3396187 DOI: 10.3748/wjg.v18.i26.3336] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 04/05/2012] [Accepted: 04/13/2012] [Indexed: 02/06/2023] Open
Abstract
As is the case in all parts of gastroenterology and hepatology, there have been many advances in our knowledge and understanding of small intestinal diseases. Over 1000 publications were reviewed for 2008 and 2009, and the important advances in basic science as well as clinical applications were considered. In Part I of this Editorial Review, seven topics are considered: intestinal development; proliferation and repair; intestinal permeability; microbiotica, infectious diarrhea and probiotics; diarrhea; salt and water absorption; necrotizing enterocolitis; and immunology/allergy. These topics were chosen because of their importance to the practicing physician.
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Reinecke K, Eminel S, Dierck F, Roessner W, Kersting S, Chromik AM, Gavrilova O, Laukevicience A, Leuschner I, Waetzig V, Rosenstiel P, Herdegen T, Sina C. The JNK inhibitor XG-102 protects against TNBS-induced colitis. PLoS One 2012; 7:e30985. [PMID: 22427801 PMCID: PMC3302790 DOI: 10.1371/journal.pone.0030985] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Accepted: 12/30/2011] [Indexed: 12/19/2022] Open
Abstract
The c-Jun N-terminal kinase (JNK)-inhibiting peptide D-JNKI-1, syn. XG-102 was tested for its therapeutic potential in acute inflammatory bowel disease (IBD) in mice. Rectal instillation of the chemical irritant trinitrobenzene sulfonic acid (TNBS) provoked a dramatic acute inflammation in the colon of 7–9 weeks old mice. Coincident subcutaneous application of 100 µg/kg XG-102 significantly reduced the loss of body weight, rectal bleeding and diarrhoea. After 72 h, the end of the study, the colon was removed and immuno-histochemically analysed. XG-102 significantly reduced (i) pathological changes such as ulceration or crypt deformation, (ii) immune cell pathology such as infiltration and presence of CD3- and CD68-positive cells, (iii) the production of tumor necrosis factor (TNF)-α in colon tissue cultures from TNBS-treated mice, (iv) expression of Bim, Bax, FasL, p53, and activation of caspase 3, (v) complexation of JNK2 and Bim, and (vi) expression and activation of the JNK substrate and transcription factor c-Jun. A single application of subcutaneous XG-102 was at least as effective or even better depending on the outcome parameter as the daily oral application of sulfasalazine used for treatment of IBD. The successful and substantial reduction of the severe, TNBS-evoked intestinal damages and clinical symptoms render the JNK-inhibiting peptide XG-102 a powerful therapeutic principle of IBD.
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Affiliation(s)
- Kirstin Reinecke
- Institute of Experimental and Clinical Pharmacology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Sevgi Eminel
- Institute of Experimental and Clinical Pharmacology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | | | - Wibke Roessner
- Pharmaceutical Institute, University of Kiel, Kiel, Germany
| | - Sabine Kersting
- Department of Visceral and General Surgery, St. Josef Hospital, Ruhr-University Bochum, Bochum, Germany
| | - Ansgar Michael Chromik
- Department of Visceral and General Surgery, St. Josef Hospital, Ruhr-University Bochum, Bochum, Germany
| | - Olga Gavrilova
- Institute for Clinical Molecular Biology, University of Kiel, University Hospital Schleswig-Holstein, Kiel, Campus Kiel, Kiel, Germany
| | - Ale Laukevicience
- Department of Physiology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Ivo Leuschner
- Institute of Pathology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Vicki Waetzig
- Institute of Experimental and Clinical Pharmacology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Philip Rosenstiel
- Institute for Clinical Molecular Biology, University of Kiel, University Hospital Schleswig-Holstein, Kiel, Campus Kiel, Kiel, Germany
| | - Thomas Herdegen
- Institute of Experimental and Clinical Pharmacology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
- * E-mail:
| | - Christian Sina
- Institute for Clinical Molecular Biology, University of Kiel, University Hospital Schleswig-Holstein, Kiel, Campus Kiel, Kiel, Germany
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Carbohydrate Elimination or Adaptation Diet for Symptoms of Intestinal Discomfort in IBD: Rationales for "Gibsons' Conundrum". Int J Inflam 2012; 2012:493717. [PMID: 22518336 PMCID: PMC3299284 DOI: 10.1155/2012/493717] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 11/13/2011] [Accepted: 11/14/2011] [Indexed: 12/16/2022] Open
Abstract
Therapeutic use of carbohydrates in inflammatory bowel diseases (IBDs) is discussed from two theoretical, apparent diametrically opposite perspectives: regular ingestion of prebiotics or withdrawal of virtually all carbohydrate components. Pathogenesis of IBD is discussed connecting microbial flora, host immunity, and genetic interactions. The best studied genetic example, NOD2 in Crohn's disease, is highlighted as a model which encompasses these interactions and has been shown to depend on butyrate for normal function. The role of these opposing concepts in management of irritable bowel syndrome (IBS) is contrasted with what is known in IBD. The conclusion reached is that, while both approaches may alleviate symptoms in both IBS and IBD, there is insufficient data yet to determine whether both approaches lead to equivalent bacterial effects in mollifying the immune system. This is particularly relevant in IBD. As such, caution is urged to use long-term carbohydrate withdrawal in IBD in remission to control IBS-like symptoms.
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Zheng X, Tsuchiya K, Okamoto R, Iwasaki M, Kano Y, Sakamoto N, Nakamura T, Watanabe M. Suppression of hath1 gene expression directly regulated by hes1 via notch signaling is associated with goblet cell depletion in ulcerative colitis. Inflamm Bowel Dis 2011; 17:2251-60. [PMID: 21987298 DOI: 10.1002/ibd.21611] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Accepted: 11/15/2010] [Indexed: 12/11/2022]
Abstract
BACKGROUND The transcription factor Atoh1/Hath1 plays crucial roles in the differentiation program of human intestinal epithelium cells (IECs). Although previous studies have indicated that the Notch signal suppresses the differentiation program of IEC, the mechanism by which it does so remains unknown. This study shows that the undifferentiated state is maintained by the suppression of the Hath1 gene in human intestine. METHODS To assess the effect of Notch signaling, doxycycline-induced expression of Notch intracellular domain (NICD) and Hes1 cells were generated in LS174T. Hath1 gene expression was analyzed by quantitative reverse-transcription polymerase chain reaction (RT-PCR). Hath1 promoter region targeted by HES1 was determined by both reporter analysis and ChIP assay. Expression of Hath1 protein in ulcerative colitis (UC) was examined by immunohistochemistry. RESULTS Hath1 mRNA expression was increased by Notch signal inhibition. However, Hath1 expression was suppressed by ectopic HES1 expression alone even under Notch signal inhibition. Suppression of the Hath1 gene by Hes1, which binds to the 5' promoter region of Hath1, resulted in suppression of the phenotypic gene expression for goblet cells. In UC, the cooperation of aberrant expression of HES1 and the disappearance of caudal type homeobox 2 (CDX2) caused Hath1 suppression, resulting in goblet cell depletion. CONCLUSIONS The present study suggests that Hes1 is essential for Hath1 gene suppression via Notch signaling. Moreover, the suppression of Hath1 is associated with goblet cell depletion in UC. Understanding the regulation of goblet cell depletion may lead to the development of new therapy for UC.
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Affiliation(s)
- Xiu Zheng
- Department of Gastroenterology and Hepatology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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Suzuki T, Yoshinaga N, Tanabe S. Interleukin-6 (IL-6) regulates claudin-2 expression and tight junction permeability in intestinal epithelium. J Biol Chem 2011; 286:31263-71. [PMID: 21771795 DOI: 10.1074/jbc.m111.238147] [Citation(s) in RCA: 428] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
In inflammatory bowel diseases (IBD), intestinal barrier function is impaired as a result of deteriorations in epithelial tight junction (TJ) structure. IL-6, a pleiotropic cytokine, is elevated in IBD patients, although the role of IL-6 in barrier function remains unknown. We present evidence that IL-6 increases TJ permeability by stimulating the expression of channel-forming claudin-2, which is required for increased caudal-related homeobox (Cdx) 2 through the MEK/ERK and PI3K pathways in intestinal epithelial cells. IL-6 increases the cation-selective TJ permeability without any changes to uncharged dextran flux or cell viability in Caco-2 cells. IL-6 markedly induces claudin-2 expression, which is associated with increased TJ permeability. The colonic mucosa of mice injected with IL-6 also exhibits an increase in claudin-2 expression. The claudin-2 expression and TJ permeability induced by IL-6 are sensitive to the inhibition of gp130, MEK, and PI3K. Furthermore, expression of WT-MEK1 induces claudin-2 expression in Caco-2 cells. Claudin-2 promoter activity is increased by IL-6 in a MEK/ERK and PI3K-dependent manner, and deletion of Cdx binding sites in the promoter sequence results in a loss of IL-6-induced promoter activity. IL-6 increases Cdx2 protein expression, which is suppressed by the inhibition of MEK and PI3K. These observations may reveal an important mechanism by which IL-6 can undermine the integrity of the intestinal barrier.
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Affiliation(s)
- Takuya Suzuki
- Department of Biofunctional Science and Technology, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima 739-8528, Japan
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Danese S. Immune and nonimmune components orchestrate the pathogenesis of inflammatory bowel disease. Am J Physiol Gastrointest Liver Physiol 2011; 300:G716-22. [PMID: 21233277 DOI: 10.1152/ajpgi.00472.2010] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Inflammatory bowel disease (IBD) pathogenesis is driven by the interactions between the innate and the adaptive immune system. Both systems are actually expressed not only by immune cells, but also by essentially all types of nonimmune cells. Nonimmune cells have classically been considered as simple targets of the aberrant inflammatory process occurring in IBD. However, the discovery that many of the functions traditionally attributed to immune cells are also performed by nonimmune cells has caused a shift to a multidirectional hypothesis in which nonimmune cells and even acellular elements are considered active players of IBD pathogenesis. The aim of this review is to summarize the current role played by each cell type in IBD pathogenesis.
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Affiliation(s)
- Silvio Danese
- IBD Center, Division of Gastroenterology, IRCCS Istituto Clinico Humanitas, Rozzano, Milan, Italy.
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Brown JB, Cheresh P, Goretsky T, Managlia E, Grimm GR, Ryu H, Zadeh M, Dirisina R, Barrett TA. Epithelial phosphatidylinositol-3-kinase signaling is required for β-catenin activation and host defense against Citrobacter rodentium infection. Infect Immun 2011; 79:1863-72. [PMID: 21343355 PMCID: PMC3088123 DOI: 10.1128/iai.01025-10] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Accepted: 02/09/2011] [Indexed: 12/23/2022] Open
Abstract
Citrobacter rodentium infection of mice induces cell-mediated immune responses associated with crypt hyperplasia and epithelial β-catenin signaling. Recent data suggest that phosphatidylinositol-3-kinase (PI3K)/Akt signaling cooperates with Wnt to activate β-catenin in intestinal stem and progenitor cells through phosphorylation at Ser552 (P-β-catenin(552)). Our aim was to determine whether epithelial PI3K/Akt activation is required for β-catenin signaling and host defense against C. rodentium. C57BL/6 mice were infected with C. rodentium and treated with dimethyl sulfoxide (DMSO) (vehicle control) or with the PI3K inhibitor LY294002 or wortmannin. The effects of infection on PI3K activation and β-catenin signaling were analyzed by immunohistochemistry. The effects of PI3K inhibition on host defense were analyzed by the quantification of splenic and colon bacterial clearance, and adaptive immune responses were measured by real-time PCR (RT-PCR) and enzyme-linked immunosorbent assay (ELISA). Increased numbers of P-β-catenin(552)-stained epithelial cells were found throughout expanded crypts in C. rodentium colitis. We show that the inhibition of PI3K signaling attenuates epithelial Akt activation, the Ser552 phosphorylation and activation of β-catenin, and epithelial cell proliferative responses during C. rodentium infection. PI3K inhibition impairs bacterial clearance despite having no impact on mucosal cytokine (gamma interferon [IFN-γ], tumor necrosis factor [TNF], interleukin-17 [IL-17], and IL-1β) or chemokine (CXCL1, CXCL5, CXCL9, and CXCL10) induction. The results suggest that the host defense against C. rodentium requires epithelial PI3K activation to induce Akt-mediated β-catenin signaling and the clearance of C. rodentium independent of adaptive immune responses.
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Affiliation(s)
- Jeffrey B. Brown
- Department of Pediatrics, Northwestern University Feinberg School of Medicine/Children's Memorial Hospital
| | - Paul Cheresh
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Tatiana Goretsky
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Elizabeth Managlia
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Gery R. Grimm
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Hyunji Ryu
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Mojgan Zadeh
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Ramanarao Dirisina
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Terrence A. Barrett
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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Dahan S, Rabinowitz KM, Martin AP, Berin MC, Unkeless JC, Mayer L. Notch-1 signaling regulates intestinal epithelial barrier function, through interaction with CD4+ T cells, in mice and humans. Gastroenterology 2011; 140:550-9. [PMID: 21056041 PMCID: PMC3031772 DOI: 10.1053/j.gastro.2010.10.057] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 10/11/2010] [Accepted: 10/26/2010] [Indexed: 01/09/2023]
Abstract
BACKGROUND & AIMS Interactions between lymphocytes and intestinal epithelial cells occur in the subepithelial space of the gastrointestinal tract. Normal human lamina propria lymphocytes (LPLs) induce differentiation of intestinal epithelial cells. The absence of LPLs in mice, such as in RAG1(-/-) mice, results in defects in epithelial cell differentiation. We investigated the role of lymphoepithelial interactions in epithelial differentiation and barrier function. METHODS We used adoptive transfer to determine if CD4(+) T cells (CD4(+)CD62L(+)CD45Rb(Hi) and/or CD4(+)CD62L(+)CD45Rb(Lo)) could overcome permeability defect (quantified in Ussing chambers). Immunofluorescence staining was performed to determine expression of cleaved Notch-1, villin, and claudin 5 in colon samples from mice and humans. Caco-2 cells were infected with a lentivirus containing a specific Notch-1 or scrambled short hairpin RNA sequence. Tight junction assembly was analyzed by immunoblot and immunofluorescence analyses, and transepithelial resistance was monitored. RESULTS Expression of cleaved Notch-1, villin, or claudin 5 was not detected in RAG1(-/-) colonocytes; their loss correlated with increased intestinal permeability. Transfer of CD45Rb(Hi) and/or CD45Rb(Lo) cells into RAG1(-/-) mice induced expression of cleaved Notch, villin, and claudin 5 in colonocytes and significantly reduced the permeability of the distal colon. Loss of Notch-1 expression in Caco-2 cells correlated with decreased transepithelial resistance and dysregulated expression and localization of tight junction proteins. Levels of cleaved Notch-1 were increased in colonic epithelium of patients with Crohn's disease. CONCLUSIONS LPLs promote mucosal barrier function, which is associated with activation of the Notch-1 signaling pathway. LPLs maintain intestinal homeostasis by inducing intestinal epithelial cell differentiation, polarization, and barrier function.
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Affiliation(s)
- Stephanie Dahan
- Immunology Institute, Mount Sinai School of Medicine, New York, New York 10029, USA.
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Roda G, Sartini A, Zambon E, Calafiore A, Marocchi M, Caponi A, Belluzzi A, Roda E. Intestinal epithelial cells in inflammatory bowel diseases. World J Gastroenterol 2010; 16:4264-71. [PMID: 20818809 PMCID: PMC2937106 DOI: 10.3748/wjg.v16.i34.4264] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The pathogenesis of inflammatory bowel diseases (IBDs) seems to involve a primary defect in one or more of the elements responsible for the maintenance of intestinal homeostasis and oral tolerance. The most important element is represented by the intestinal barrier, a complex system formed mostly by intestinal epithelial cells (IECs). IECs have an active role in producing mucus and regulating its composition; they provide a physical barrier capable of controlling antigen traffic through the intestinal mucosa. At the same time, they are able to play the role of non-professional antigen presenting cells, by processing and presenting antigens directly to the cells of the intestinal immune system. On the other hand, immune cells regulate epithelial growth and differentiation, producing a continuous bi-directional cross-talk within the barrier. Several alterations of the barrier function have been identified in IBD, starting from mucus features up to its components, from epithelial junctions up to the Toll-like receptors, and altered immune responses. It remains to be understood whether these defects are primary causes of epithelial damage or secondary effects. We review the possible role of the epithelial barrier and particularly describe the role of IECs in the pathogenesis of IBD.
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Lee G, Goretsky T, Managlia E, Dirisina R, Singh AP, Brown JB, May R, Yang GY, Ragheb JW, Evers BM, Weber CR, Turner JR, He XC, Katzman RB, Li L, Barrett TA. Phosphoinositide 3-kinase signaling mediates beta-catenin activation in intestinal epithelial stem and progenitor cells in colitis. Gastroenterology 2010; 139:869-81, 881.e1-9. [PMID: 20580720 PMCID: PMC2930080 DOI: 10.1053/j.gastro.2010.05.037] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Revised: 05/11/2010] [Accepted: 05/19/2010] [Indexed: 12/21/2022]
Abstract
BACKGROUND & AIMS Mechanisms responsible for crypt architectural distortion in chronic ulcerative colitis (CUC) are not well understood. Data indicate that serine/threonine protein kinase Akt (Akt) signaling cooperates with Wingless (Wnt) to activate beta-catenin in intestinal stem and progenitor cells through phosphorylation at Ser552 (P-beta-catenin(552)). We investigated whether phosphoinositide 3-kinase (PI3K) is required for Akt-mediated activation of beta-catenin during intestinal inflammation. METHODS The class IA subunit of PI3K was conditionally deleted from intestinal epithelial cells in mice named I-pik3r1KO. Acute inflammation was induced in mice and intestines were analyzed by biochemical and histologic methods. The effects of chemically blocking PI3K in colitic interleukin-10(-/-) mice were examined. Biopsy samples from patients were examined. RESULTS Compared with wild-type, I-pik3r1KO mice had reduced T-cell-mediated Akt and beta-catenin signaling in intestinal stem and progenitor cells and limited crypt epithelial proliferation. Biochemical analyses indicated that PI3K-Akt signaling increased nuclear total beta-catenin and P-beta-catenin(552) levels and reduced N-terminal beta-catenin phosphorylation, which is associated with degradation. PI3K inhibition in interleukin-10(-/-) mice impaired colitis-induced epithelial Akt and beta-catenin activation, reduced progenitor cell expansion, and prevented dysplasia. Human samples had increased numbers of progenitor cells with P-beta-catenin(552) throughout expanded crypts and increased messenger RNA expression of beta-catenin target genes in CUC, colitis-associated cancer, tubular adenomas, and sporadic colorectal cancer, compared with control samples. CONCLUSIONS PI3K-Akt signaling cooperates with Wnt to increase beta-catenin signaling during inflammation. PI3K-induced and Akt-mediated beta-catenin signaling are required for progenitor cell activation during the progression from CUC to CAC; these factors might be used as biomarkers of dysplastic transformation in the colon.
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Affiliation(s)
- Goo Lee
- Department of Internal Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
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Hanson PJ, Moran AP, Butler K. Paracellular permeability is increased by basal lipopolysaccharide in a primary culture of colonic epithelial cells; an effect prevented by an activator of Toll-like receptor-2. Innate Immun 2010; 17:269-82. [PMID: 20472611 DOI: 10.1177/1753425910367813] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Lipopolysaccharide (LPS), which generally activates Toll-like receptor 4 (TLR4), is expressed on commensal colonic bacteria. In a number of tissues, LPS can act directly on epithelial cells to increase paracellular permeability. Such an effect in the colon would have an important impact on the understanding of normal homeostasis and of pathology. Our aim was to use a novel primary culture of colonic epithelial cells grown on Transwells to investigate whether LPS, or Pam(3)CSK( 4), an activator of TLR2, affected paracellular permeability. Consequently, [(14)C]-mannitol transfer and transepithelial electrical resistance (TEER) were measured. The preparation consisted primarily of cytokeratin-18 positive epithelial cells that produced superoxide, stained for mucus with periodic acid-Schiff reagent, exhibited alkaline phosphatase activity and expressed TLR2 and TLR4. Tight junctions and desmosomes were visible by transmission electron microscopy. Basally, but not apically, applied LPS from Escherichia coli increased the permeability to mannitol and to a 10-kDa dextran, and reduced TEER. The LPS from Helicobacter pylori increased paracellular permeability of gastric cells when applied either apically or basally, in contrast to colon cells, where this LPS was active only from the basal aspect. A pan-caspase inhibitor prevented the increase in caspase activity caused by basal E. coli LPS, and reduced the effects of LPS on paracellular permeability. Synthetic Pam(3)CSK(4) in the basal compartment prevented all effects of basal E. coli LPS. In conclusion, LPS applied to the base of the colonic epithelial cells increased paracellular permeability by a mechanism involving caspase activation, suggesting a process by which perturbation of the gut barrier could be exacerbated. Moreover, activation of TLR2 ameliorated such effects.
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Affiliation(s)
- Peter J Hanson
- Life and Health Sciences, Aston University, Birmingham, UK.
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Sipos F, Muzes G, Valcz G, Galamb O, Tóth K, Leiszter K, Krenács T, Tulassay Z, Molnár B. Regeneration associated growth factor receptor and epithelial marker expression in lymphoid aggregates of ulcerative colitis. Scand J Gastroenterol 2010; 45:440-448. [PMID: 20132083 DOI: 10.3109/00365521003624144] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE Mesenchymal-epithelial transition may have crucial role in mucosal regeneration, hence we assayed epithelial growth factor receptor (EGFR), insulin-like growth factor receptor-1 (IGF1R), hepatocyte-derived growth factor receptor (HGFR), CDX2 and cytokeratin (CK) expression in lymphoid aggregates (LA) of ulcerative colitis (UC). MATERIAL AND METHODS Tissue microarrays (TMAs) made of biopsy samples from 20 mildly, 20 moderately and 20 severely active UC, 12 non-specific colitis (NSC) and 20 healthy colon were prepared, and immunolabelled with anti-EGFR, -IGF1R, -HGFR, -CDX2, -CK antibodies. After virtual microscopic evaluation, one-way ANOVA and correlation analysis were performed. For validation, TaqMan real-time RT-PCR was performed by using RNA from laser microdissected LA from 10 healthy colon and 10 endoscopically active UC biopsies. RESULTS The number of LA was in tight positive correlation with the severity of inflammation (r=0.9). The number of EGFR/HGFR positive subepithelial cells was found to be significantly elevated in severe (21.6+/-2.1%/21.3+/-1.9%), moderate (14.3+/-1.7%/14.6+/-1.6%) and mild (7.2+/-1.6%/7.4+/-1.3%) inflammation compared to healthy colon mucosa (2.6+/-1.4%/2.4+/-1.03%) (p < 0.005). Some alterations were found between UC and NSC samples regarding EGFR and HGFR expression. IGF1R immunoreactive cells were only found in a trace number in all cases. Increasing trend of CDX2 and CK positive subepithelial cells was found in active UC, but it was not in significant correlation with the severity of inflammation. CONCLUSION EGFR and HGFR positive subepithelial cells in LA may be involved in the induction of the regenerative mucosal processes. The presence of CDX2/CK positive subepithelial cells suggests that mesenchymal-to-epithelial transition may be located to lymphoid aggregates.
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Affiliation(s)
- Ferenc Sipos
- 2nd Department of Internal Medicine, Semmelweis University, Budapest, Hungary.
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