1-Methyl-4-phenylpyridinium ion (MPP+), an inhibitor of mitochondrial complex I, has been widely used as a neurotoxin because it elicits a severe Parkinson's disease-like syndrome characterized by elevation of intracellular reactive oxygen species level and apoptotic death. Adiponectin, secreted from adipose tissue, mediates systemic insulin sensitivity with liver and muscle as target organs. Adiponectin can also suppress superoxide generation in endothelial cells. In the present study, we investigated the protective effects of adiponectin on MPP+-induced cytotoxicity in human neuroblastoma SH-SY5Y cells, as well as the underlying mechanism. Our results suggest that the protective effects of adiponectin on MPP+-induced apoptosis may be ascribed to its anti-oxidative properties, anti-apoptotic activity via inducing expression of SOD and catalase, and regulation of Bcl-2 and Bax expression. These data indicated that adiponectin might provide a useful therapeutic strategy for the treatment of progressive neurodegenerative diseases such as Parkinson's disease.
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