[Effect of ginsenoside Rg1 on expression of p21, cyclin E and CDK2 in the process of cell senescence].

ABSTRACT

AIM: To explore the possible role of p21, cyclin E and cyclin-dependent kinase 2 (CDK2) in the protection of ginsenoside Rg1 against tert-butylhydroperoxide (t-BHP)-induced senescence in WI-38 cells. METHODS: The cellular ultrastructure, cytometric assay and beta-galactosidase (beta-gal) cytochemistry staining were used to evaluate cell senescence. The levels of of p21, cyclin E and CDK2 protein were detected by Western blot. RESULTS: Pretreatment with Rg1 significantly attenuated t-BHP-induced senescence in WI-38 cells. Simultaneously, compared with cells treated with t-BHP alone, Rg1 pretreatment markedly decreased the level of p21 protein and increased the levels of CDK2 and cyclin E. CONCLUSION: p21, cyclin E and CDK2 may be involved in the process of ginsenoside Rg1 protection against t-BHP-induced senescence in WI-38 cells.