Editorial
Copyright ©2009 The WJG Press and Baishideng. All rights reserved.
World J Gastroenterol. May 14, 2009; 15(18): 2184-2189
Published online May 14, 2009. doi: 10.3748/wjg.15.2184
Signal transduction pathways in liver and the influence of hepatitis C virus infection on their activities
Magdalena M Dabrowska, Anatol Panasiuk, Robert Flisiak
Magdalena M Dabrowska, Anatol Panasiuk, Robert Flisiak, Department of Infectious Diseases and Hepatology, Medical University of Bialystok, 14 Zurawia Str, 15-540 Bialystok, Poland
Author contributions: Dabrowska MM, Panasiuk A and Flisiak R contributed equally to this paper.
Correspondence to: Magdalena M Dabrowska, MD, Department of Infectious Diseases and Hepatology, Medical University of Bialystok, 14 Zurawia Str, 15-540 Bialystok, Poland. m.dabrowska@op.pl
Telephone: +48-85-7409480
Fax: +48-85-7416921
Received: January 25, 2009
Revised: March 15, 2009
Accepted: March 22, 2009
Published online: May 14, 2009
Abstract

In liver, the most intensively studied transmembrane and intracellular signal transduction pathways are the Janus kinase signal transduction pathway, the mitogen-activated protein kinases signal transduction pathway, the transforming growth factor β signal transduction pathway, the tumor necrosis factor α signal transduction pathway and the recently discovered sphingolipid signal transduction pathway. All of them are activated by many different cytokines and growth factors. They regulate specific cell mechanisms such as hepatocytes proliferation, growth, differentiation, adhesion, apoptosis, and synthesis and degradation of the extracellular matrix. The replication cycle of hepatitis C virus (HCV) is intracellular and requires signal transduction to the nucleus to regulate transcription of its genes. Moreover, HCV itself, by its structural and non-structural proteins, could influence the activity of the second signal messengers. Thus, the inhibition of the transmembrane and intracellular signal transduction pathways could be a new therapeutic target in chronic hepatitis C treatment.

Keywords: Liver; Hepatitis C virus infection; Signal transduction pathway; Proliferation; Apoptosis