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Parkinson's disease (PD) is a severe neurodegenerative disorder characterized by the loss of brain dopaminergic neurons. Beside pharmacologic and symptomatic treatment of PD the neuroprotective therapy has recently attracted more attention. Apelin, a novel neuropeptide, and its receptors have numerous reported roles in regulating brain functions. In addition, this peptide has potent neuroprotective effects in some neurodegenerative situations. In this study, the effects of apelin-13 were investigated in a cell model of PD. Human neuroblastoma SH-SY5Y cell damage was induced by 150 μM 6-hydroxydopamine (6-OHDA) and the cells viability was examined by MTT assay. Intracellular reactive oxygen species (ROS) and mitochondrial membrane potential were determined by fluorescence spectrophotometry method. Immunoblotting analysis was also employed to evaluate cytochrome c release and caspase-3 …