Abstract
1-Methyl-4-phenylpyridinium ion (MPP(+)), an active metabolite of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine, induces cell death and inhibition of cell proliferation in various cells. However, the mechanism whereby MPP(+) inhibits cell proliferation is still unclear. In this study, we found that MPP(+) suppressed the proliferation with accumulation in G(1) phase without inducing cell death in p53-deficient MG63 osteosarcoma cells. MPP(+) induced hypophosphorylation of retinoblastoma protein and rapidly down-regulated the protein but not mRNA levels of cyclin D1 in MG63 cells. The down-regulation of cyclin D1 protein was suppressed by a proteasome inhibitor, MG132. The cyclin D1 down-regulation by MPP(+) was also observed in p53-positive PC12, HeLa S3, and HeLa rho(0) cells, which are a subclone of HeLa S3 lacking mitochondrial DNA. Moreover, MPP(+) dephosphorylated Akt in PC12 cells, which was rescued by the pretreatment with nerve growth factor. In addition, the pretreatment with nerve growth factor or lithium chloride, a glycogen synthase kinase-3beta inhibitor, suppressed the cyclin D1 down-regulation caused by MPP(+). Our results demonstrate that MPP(+) induces cell cycle arrest independently of its mitochondrial toxicity...Continue Reading
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