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Helicobacter pylori γ-glutamyltranspeptidase induces cell cycle arrest at the G1-S phase transition

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Abstract

In our previous study, we showed that Helicobacter pylori γ-glutamyltranspeptidase (GGT) is associated with H. pylori-induced apoptosis through a mitochondrial pathway. To better understand the role of GGT in apoptosis, we examined the effect of GGT on cell cycle regulation in AGS cells. To determine the effect of recombinant GGT (rGGT) on cell cycle distribution and apoptosis, rGGT-treated and untreated AGS cells were analyzed in parallel by flow cytometry using propidium iodide (PI). We found that rGGT inhibited the growth of AGS cells in a time-dependent manner, and that the pre-exposure of cells to a caspase-3 inhibitor (z-DEVD-fmk) effectively blocked GGT-induced apoptosis. Cell cycle analysis showed G1 phase arrest and apoptosis in AGS cells following rGGT treatment. The rGGT-mediated G1 phase arrest was found to be associated with down-regulation of cyclin E, cyclin A, Cdk 4, and Cdk 6, and the up-regulation of the cyclindependent kinase (Cdk) inhibitors p27 and p21. Our results suggest that H. pylori GGT induces cell cycle arrest at the G1-S phase transition.

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Correspondence to Seung-Chul Baik.

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These authors contributed equally to this work.

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Kim, KM., Lee, SG., Kim, JM. et al. Helicobacter pylori γ-glutamyltranspeptidase induces cell cycle arrest at the G1-S phase transition. J Microbiol. 48, 372–377 (2010). https://doi.org/10.1007/s12275-010-9293-8

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