Regulation of SIRT3 signal related metabolic reprogramming in gastric cancer by Helicobacter pylori oncoprotein CagA
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Do Yeon Lee1, Dawoon E. Jung2, Sung Sook Yu3, Yeo Song Lee4, Beom Ku Choi5 and Yong Chan Lee1
1Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
2Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
3Department of Biomedical Science, Yonsei University College of Medicine, Seoul, Korea
4Samsung Medical Research Center, Seoul, Korea
5Immune & Cell Therapy Branch, Division of Cancer Biology, National Cancer Center, Gyeonggi-do, Korea
Yong Chan Lee, email: [email protected]
Keywords: helicobacter pylori, CagA, SIRT3, HIF-1α, gastric cancer
Received: December 22, 2016 Accepted: May 22, 2017 Published: June 27, 2017
Injection of the Helicobacter pylori cytotoxin-associated gene A (CagA) is closely associated with the development of chronic gastritis and gastric cancer. Individuals infected with H. pylori possessing the CagA protein produce more reactive oxygen species (ROS) and show an increased risk of developing gastric cancer. Sirtuins (SIRTs) are nicotinamide adenine dinucleotide (NAD+)-dependent deacetylases and mitochondrial SIRT3 is known to be a tumor suppressor via its ability to suppress ROS and hypoxia inducible factor 1α (HIF-1α). However, it is unclear whether increased ROS production by H. pylori is regulated by SIRT3 followed by HIF-1α regulation and whether intracellular CagA acts as a regulator thereof. In this study, we investigated correlations among SIRT3, ROS, and HIF-1α in H. pylori-infected gastric epithelial cells. We observed that SIRT3-deficient AGS cells induce HIF-1α protein stabilization and augmented transcriptional activity under hypoxic conditions. In CagA+ H. pylori infected cells, CagA protein localized to mitochondria where it subsequently suppressed SIRT3 proteins. CagA+ H. pylori infection also increased HIF-1α activity through the ROS production induced by the downregulated SIRT3 activity, which is similar to the hypoxic condition in gastric epithelial cells. In contrast, overexpression of SIRT3 inhibited the HIF-1α protein stabilization and attenuated the increase in HIF-1α transcriptional activity under hypoxic conditions. Moreover, CagA+ H. pylori attenuated HIF-1α stability and decreased transcriptional activity in SIRT3-overexpressing gastric epithelial cells. Taken together, these findings provide valuable insights into the potential role of SIRT3 in CagA+ H. pylori-mediated gastric carcinogenesis and a possible target for cancer prevention via inhibition of HIF-1α.
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