期刊
ANTIOXIDANTS & REDOX SIGNALING
卷 21, 期 18, 页码 2531-2542出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/ars.2013.5604
关键词
-
资金
- NUSHS bench-to-bedside grant [NUHSRO/2011/012/STB/B2B-08]
- National Kidney Foundation [NKFRC/2011/01/04]
Aims: Mitochondrion is considered as the major source of intracellular reactive oxygen species (ROS). H2S has been reported to be an antioxidant, but its mechanism remains largely elusive. P66Shc is an upstream activator of mitochondrial redox signaling. The aim of this study was to explore whether the antioxidant effect of H2S is mediated by p66Shc. Results: Application of exogenous H2S with its donor, NaHS, or overexpression of its generating enzyme, cystathionine beta-synthase, induced sulfhydration of p66Shc, but inhibited its phosphorylation caused by H2O2/D-galactose in SH-SY5Y cells or in the mice cortex. H2S also decreased mitochondrial ROS production and protected neuronal cells against stress-induced senescence. PKC beta II and PP2A are the two key proteins to regulate p66Shc phosphorylation. Although H2S failed to affect the activities of these two proteins, it disrupted their association. Cysteine-59 resides in proximity to serine-36, the phosphorylation site of p66Shc. The C59S mutant attenuated the above-described biological function of H2S. Innovation: We revealed a novel mechanism for the antioxidant effect of H2S and its role in oxidative stress-related diseases. Conclusion: H2S inhibits mitochondrial ROS production via the sulfhydration of Cys-59 residue, which in turn, prevents the phosphorylation of p66Shc. Antioxid. Redox Signal. 21, 2531-2542.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据