期刊
DNA REPAIR
卷 7, 期 11, 页码 1809-1823出版社
ELSEVIER
DOI: 10.1016/j.dnarep.2008.07.010
关键词
hMTH1; Hydrogen peroxide; p53; Noxa; Caspase-3/7; Caspase-8; Apoptosis
资金
- Korea Government (MOST) [M1063901, M20706000032]
Although the accumulation of 8-oxo-dGTP in DNA is associated with apoptotic cell death and mutagenesis, little is known about the exact mechanism of hMTH1-mediated suppression of oxidative-stress-induced cell death. Therefore, we investigated the regulation of DNA- damage-related apoptosis induced by oxidative stress using control and hMTH1 knockdown cells. Small interfering RNA (siRNA) was used to suppress hMTH1 expression in p53-proficient GM00637 and H460 cells, resulting in a significant increase in apoptotic cell death after H2O2 exposure; however, p53-null, hMTH1-deficient H1299 cells did not exhibit H2O2-induced apoptosis. In addition, hMTH1-deficient GM00637 and H460 cells showed increased caspase-3/7 activity, cleaved caspase-8, and Noxa expression, and gamma-H(2)AX formation in response to H2O2. In contrast, the caspase inhibitors, p53-siRNA, and Noxa-siRNA suppressed H2O2-induced cell death. Moreover, in 8-week (long-term) cultured H460 and H1299 cells, hMTH1 suppression increased cell death, Noxa expression, and gamma-H2AX after H2O2 exposure, compared to 3-week (short-term) cultured cells. These data indicate that hMTH1 plays an important role in protecting cells against H2O2-induced apoptosis via a Noxa- and caspase-3/7-mediated signaling pathway, thus conferring a survival advantage through the inhibition of oxidative - stress-in duced DNA damage. (C) 2008 Elsevier B.V. All fights reserved.
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