Resistin induces rat insulinoma cell RINm5F apoptosis
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Beta-cell apoptosis induced by adipokines may result in beta-cell dysfunction in type 2 diabetes. Resistin, an adipokine-linked obesity with type 2 diabetes, impairs glucose-stimulated insulin secretion (GSIS) in beta-cells. Presently, the effects of resistin on rat insulinoma cells RINm5F were examined. Treatment of RINm5F with resistin induced cell damage. Tissue Inhibitor of Metalloproteinase-1 (TIMP-1) protected resistin-mediated cytotoxicity in RINm5F. Incubation with resistin up-regulated caspase-3 activity and induced the formation of a DNA ladder. TIMP-1 attenuated these effects. The molecular mechanism of TIMP-1 inhibition of resistin-mediated cytotoxicity appeared to involve Akt phosphorylation and activation of IkB-α phosphorylation. Resistin treatment suppressed Akt phosphorylation and activated IkB-α phosphorylation, which could be attenuated by TIMP-1. We conclude that resistin can induce beta-cell apoptosis and that resistin-related beta-cell apoptosis can be prevented by TIMP-1.
KeywordsResistin TIMP-1 Beta-cell Apoptosis
This study was supported by the National Natural Science Foundation of China (No 30371502; 30571978), the Natural Science Foundation of Jiangsu Province (No BK2001120), and a grant from Jiangsu Province Health Department (No RC2002061).
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