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Kim, Sun J.,Yune, Tae Y.,Han, Ching T.,Kim, Young C.,Oh, Young J.,Markelonis, George J.,Oh, Tae H. Wiley Subscription Services, Inc., A Wiley Company 2007 JOURNAL OF NEUROSCIENCE RESEARCH - Vol.85 No.1
<P>The neuroprotective effect of mitochondrial isocitrate dehydrogenase (IDPm), an enzyme involved in the reduction of NADP<SUP>+</SUP> to NADPH and the supply of glutathione (GSH) in mitochondria, was examined using SH-SY5Y cells overexpressing IDPm (S1). S1 cells showed higher NADPH and GSH levels than vector transfectant (V) cells and were more resistant to staurosporine-induced cell death than controls. Staurosporine-induced cytochrome c release, caspase-3 activation, and production of reactive oxygen species (ROS) were significantly attenuated in S1 cells as compared to V cells and reduced by antioxidants, trolox and GSH-ethyl ester (GSH-EE). Staurosporine-induced the release of Mcl-1 from mitochondria that formed a complex with Bim. Mcl-1 was then cleaved to a shortened form in a caspase-3 dependent manner; its release was attenuated far more in S1 than in V cells after staurosporine treatment. Finally, the staurosporine-induced decrease in mitochondrial membrane potential (Δψ<SUB>m</SUB>) was correlated with the time of mitochondrial Mcl-1 release; the loss of Δψ<SUB>m</SUB> was attenuated significantly in S1 cells as compared to that in V cells. These results suggest that the neuroprotective effect of IDPm may result from increases in NADPH and GSH levels in the mitochondria. This, in turn, inhibits mitochondrial ROS production after cytochrome c release, which seems to be mediated through Mcl-1 release. © 2006 Wiley-Liss, Inc.</P>