Protective effects of edaravone against cobalt chloride-induced apoptosis in PC12 cells

Objective

To investigate the neuroprotective effects of edaravone (Eda) on cobalt chloride (CoCl₂)-induced oxidative stress and apoptosis in cultured PC12 cells as well as the underlying mechanisms.

Methods

PC12 cells impaired by CoCl₂ were used as the cell model of hypoxia. MTT (methyl thiazolyl tetrazolium) was used to assay the viability of the PC12 cells exposed to Eda with gradient concentrations; Hochest 33258 stain assay was used to analyze the apoptosis ratio of the PC12 cells; Bcl-2 and Bax protein levels in PC12 cells were examined by western blotting. ROS level, the mitochondrial transmembrane potential and caspase-3 activity in each group were detected by spectrofluorometer.

Results

CoCl₂ treatment caused the loss of cell viability in PC12 cells, which was associated with the elevation of apoptotic rate, the formation of ROS and the disruption of mitochondrial transmembrane potential. CoCl₂ also significantly induced the upregulation of Bax/Bcl-2 ratio and the activation of caspase-3. In contrast, Eda significantly reversed these phenotypes, with its maximum protective effect at 0.1 μmol/L.

Conclusion

These results indicated that Eda could protect PC12 cells from CoCl₂-induced cytotoxicity, and this protection might be ascribed to its anti-oxidative and anti-apoptotic activities.