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Sheng-Guo Zhao, Jia-Qi Wang, Guang-Lei Liu, Jin-Bo Cheng, Chun-Gang Zhang, State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agriculture Sciences, Beijing 100094, China
Supported by: the Dairy Momentous Project of National Key Technology R&D Program during the 11th Five-Year Plan Period, No. 2006BAD04A03.
Correspondence to: Jia-Qi Wang, Institute of Animal Science, Chinese Academy of Agricultural Science, 2 Yuanmingyuan Western Road, Beijing 100094, China. wang-jia-qi@263.net
Received: September 13, 2007 Revised: February 27, 2008 Accepted: March 28, 2008 Published online: April 8, 2008
Helicobacter pylori (H. pylori) live in the stomach of human. It is a kind of curve bacteria which can lead to chronic gastritis, peptic ulcer and gastric cancer. Usually, antibiotics are used to treat the patients, but they have a lot of side effects. Milk of milch cow immunized with H. pylori vaccine can prevent and treat the infection of H. pylori without side effects. During the production of immune milk, the basic work is to prepare vaccine. During the preparation of sub-unit vaccine, key is to isolate and purify the antigen protein. In this article, we discuss the culture of H. pylori (solid and liquid culture), the recombinant expression and purification of its antigen protein (urease, VacA, CagA and lipopolysaccharide).
是革兰氏阴性菌胞膜的主要组成成分, H. pylori LPS由内核和脂质A组成, 多糖成分主要含有半乳糖、氨基葡萄糖、葡萄糖等[36-37]. H. pylori与沙门氏菌和大肠杆菌相比, 其LPS免疫活性更低, 因为小鼠的半数致死量, H. pylori LPS要高出大肠与沙门菌LPS的500-10 000倍. H. pylori LPS能加速组织胺的释放和DNA合成, 还能增加胃黏膜细胞的超氧阴离子, 引起胃黏膜细胞凋亡[38-39].
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