VCP Phosphorylation-Dependent Interaction Partners Prevent Apoptosis in Helicobacter pylori-Infected Gastric Epithelial Cells |
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| Authors: | Cheng-Chou Yu Jyh-Chin Yang Yen-Ching Chang Jiing-Guang Chuang Chung-Wu Lin Ming-Shiang Wu Lu-Ping Chow |
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| Institution: | 1. Graduate Institute of Biochemistry and Molecular Biology, College of Medicine, National Taiwan University Hospital, Taipei, Taiwan.; 2. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.; 3. Department of Pathology, National Taiwan University Hospital, Taipei, Taiwan.; Veterans Affairs Medical Center (111D), United States of America, |
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| Abstract: | Previous studies have demonstrated that valosin-containing protein (VCP) is associated with H. pylori-induced gastric carcinogenesis. By identifying the interactome of VCP overexpressed in AGS cells using a subtractive proteomics approach, we aimed to characterize the cellular responses mediated by VCP and its functional roles in H. pylori-associated gastric cancer. VCP immunoprecipitations followed by proteomic analysis identified 288 putative interacting proteins, 18 VCP-binding proteins belonged to the PI3K/Akt signaling pathway. H. pylori infection increased the interaction between Akt and VCP, Akt-dependent phosphorylation of VCP, levels of ubiquitinated proteins, and aggresome formation in AGS cells. Furthermore, phosphorylated VCP co-localized with the aggresome, bound ubiquitinated proteins, and increased the degradation of cellular regulators to protect H. pylori-infected AGS cells from apoptosis. Our study demonstrates that VCP phosphorylation following H. pylori infection promotes both gastric epithelial cell survival, mediated by the PI3K/Akt pathway, and the degradation of cellular regulators. These findings provide novel insights into the mechanisms of H. pylori infection induced gastric carcinogenesis. |
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