Abstract
In this study, the role of V12-Rac1 in the cisplatin-induced apoptosis was investigated. Cisplatin-induced apoptosis is associated with cytochrome c release, which can be inhibited by V12-Rac1 expression. The analysis of mitogen-activated protein kinase activity indicated that V12-Rac1 expression led to a decrease in p38 activity after exposure to cisplatin but not c-jun N-terminal kinase and extracellular signal-regulated kinase. Using pharmacological inhibitors, it was found that only p38 is a critical mediator in the cisplatin-induced apoptosis of NIH3T3 cells. This suggests that V12-Rac1 can stimulate the anti-apoptotic signaling pathway in response to cisplatin, and that decreased p38 activity caused by V12-Rac1 expression in cisplatin-treated NIH3T3 cells is crucial for V12-Rac1-dependent cell survival.
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