【摘 要】
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Objective:Mitophagy is known to contribute towards progression of Parkinson\'s disease.Korean red ginseng (KRG) is a widely used medicinal herb in East Asia,and recent studies have reported that KRG prevents 1-methyl-4-phenylpyridinium ion (MPP+)-induce
【机 构】
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Department of Korean Medical Science,School of Korean Medicine,Pusan National University,Yangsan,Gye
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Objective:Mitophagy is known to contribute towards progression of Parkinson\'s disease.Korean red ginseng (KRG) is a widely used medicinal herb in East Asia,and recent studies have reported that KRG prevents 1-methyl-4-phenylpyridinium ion (MPP+)-induced cell death.This study was undertaken to investigate whether KRG suppresses MPP+-induced apoptosis and mitophagy.Methods:SH-SY5Y cells were incubated with KRG for 24 h,and subsequently exposed to MPP+.The MPP+-induced cell death was confirmed with the 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl tetrazolium bro-mide assay,and the terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling assay.Changes in the structure and function of mitochondria were confirmed using mitotracker,MitoSOX red mitochondrial superoxide indicator,parkin,and phosphatase and tensin homolog deleted on chromo-some ten-induced putative kinase 1 (PINK1) immunofluorescent staining.Western blotting was per-formed to evaluate the expression of apoptosis-related factors in whole cells,including Bax,Bcl-2 and cleaved caspase-3,and mitophagy-related factors in the mitochondrial fraction,including cytochrome c,parkin,PINK1,translocase of the outer membrane 20 (TOM20),p62 and Beclin 1.Results:MPP+ induced cell death by cytochrome c release and caspase-3 activation;however,this effect was suppressed by KRG\'s regulation of the expressions of Bcl-2 and Bax.Moreover,MPP+ exposure increased the mitochondrial expressions of parkin,PINK1,Beclin 1 and p62,and decreased TOM20,cyto-chrome c and Bcl-2 expressions.These MPP+-induced changes in the mitochondrial fraction were atten-uated by treatment with KRG.Conclusion:KRG effectively prevents MPP+-induced SH-SY5Y cell death by regulating cytochrome c release from mitochondria and PINK1/parkin-mediated mitophagy,through regulation of the Bcl-2 family.
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