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p27 kip1 Upregulated by hnRNPC1/2 Antagonizes CagA (a Virulence Factor of Helicobacter pylori )‐Mediated Pathogenesis
Author(s) -
Jin Shenghang,
Wu Minjin,
Cao Hanqin,
Ying Sunke,
Hua Jiping,
Chen Yu
Publication year - 2012
Publication title -
helicobacter
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.206
H-Index - 79
eISSN - 1523-5378
pISSN - 1083-4389
DOI - 10.1111/j.1523-5378.2011.00927.x
Subject(s) - caga , pathogenesis , virulence factor , virulence , helicobacter pylori , downregulation and upregulation , microbiology and biotechnology , medicine , biology , immunology , gene , genetics
Background and Aims: Infection by Helicobacter pylori is one of the major contributing factors of chronic active gastritis and peptic ulcer and is closely associated with the occurrence and progression of gastric cancer. CagA protein is a major virulence factor of H. pylori that interacts with SHP‐2, a true oncogene, to interfere with cellular signaling pathways; CagA also plays a crucial role in promoting the carcinogenesis of gastric epithelial cells. However, currently, the molecular mechanisms of gastric epithelial cells that antagonize CagA pathogenesis remain inconclusive. Methods: We showed that AGS gastric cancer cells transfected with CagA exhibited the inhibition of proliferation and increased activity of caspase 3/7 using two‐dimensional gel electrophoresis and secondary mass spectrometry (MS/MS). Results: It was found that the AGS gastric cancer cells stably expressing CagA displayed significantly increased the expression of 16 proteins, including hnRNPC1/2. Further analysis revealed that hnRNPC1/2 significantly boosted the expression of the p27 kip1 protein. Conclusion: Our data suggested that hnRNPC1/2 upregulates p27 kip1 expression and the subsequent suppression of cell proliferation and induction of apoptosis, thereby providing an important mechanism whereby gastric epithelial cells antagonize CagA‐mediated pathogenesis.