Diazoxide Protects L6 Skeletal Myoblasts from H2o2-Induced Apoptosis Via the Phosphatidylinositol-3 Kinase/Akt Pathway

OBJECTIVES AND DESIGN: Transplanted cell survival might greatly improve the therapeutic efficacy of cell therapy. Diazoxide (DZ), a highly selective mitochondrial ATP-sensitive potassium channel opener, is known to suppress cell apoptosis and protect cells in oxidative stressed ischemic environment. We explored the mechanisms involved in DZ pre-treatment-induced anti-apoptotic effect on L6 skeletal myoblast (SKM). MATERIALS AND METHODS: L6 SKMs were divided into control group, H2O2 group, DZ?+?H2O2 group and DZ?+?LY?+?H2O2 group. Treatments of 400?μmol/L H2O2 for 24?h alone, or after 200?μmol/L DZ pre-treatment for 30?min, or after DZ and 50?μmol/L LY294002 co-administration for 30?min were performed. The cell apoptosis rates were assessed by flow cytometric analysis. The changes of mitochondrial membrane potential were determined by JC-1 mitochondrial staining. The activation of phosphatidylinositol-3 kinase (PI3K)/Akt, caspase-9 and caspase-3 was detected by western blot. RESULTS: Compared with the H2O2 group, DZ pre-treatment protected cells from H2O2-induced damage, increased Akt phosphorylation, prevented mitochondrial membrane depolarization as well as the activation of caspase-9 and caspase-3 and decreased the cell apoptosis rate. However, the DZ-induced cytoprotective and anti-apoptosis effects were partly inhibited by co-administration of a PI3K inhibitor, LY294002. CONCLUSIONS: These data suggest that DZ pre-treatment contributes to protection of L6 SKMs against apoptosis at least partly by activating the PI3K/Akt pathway and subsequently inhibiting the mitochondrial-mediated caspase-dependent apoptotic signalling pathway.

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