Objective:To investigate the effects of an ethanol extract of Kalopanax septemlobus(Thunb.)Koidz.leaf(EEKS) on cell proliferation in human hepatocellular carcinoma cells and its mechanisms of action.Methods:Cells were treated with EEKS and subsequently analyzed for cell proliferation and flow cytometry analysis.Expressions of cell cycle regulators were determined by reverse transcriptase polymerase chain reaction analysis and Western blotting,and activation of eyclin-associaled kinases studied using kinase assays.Results:The EEKS suppressed cell proliferation in both HepG2 and Hep3 B cells,but showed a more sensitive anli-proliferative activity in HepG2 cells.Flow cytometry analysis revealed an association between the growth inhibitory effect of EEKS and with G_1 phase cell cycle arrest in HepG2 cells,along with the dephosphorylation of retinoblastoma protein(pRB) and enhanced binding of pRB with the E2 F transcription factor family proteins.Treatment with EEKS also increased the expression of cyclin-dependent kinase(CDK) inhibitors,such as p21WAF1/CIP1 and p27KIP1.without any noticeable changes in G_1 cyclins and CDKs(except for a slight decrease in CDK4).Treatment of HepG2 cells with EEKS also increased the binding of p21 and p27 with CDK4 and CDK6.which was paralleled by a marked decrease in the cyclin D- and cyclin E-associated kinase activities.Conclusions:Overall,our findings suggest that EEKS may be an effective treatment for liver cancer through suppression of cancer cell proliferation via G_1,cell cycle arrest Further studies arc required to identify the active compounds in EEKS. Objective: To investigate the effects of an ethanol extract of Kalopanax septemlobus (Thunb.) Koidz.leaf (EEKS) on cell proliferation in human hepatocellular carcinoma cells and its mechanisms of action. Methods: Cells were treated with EEKS and subsequently analyzed for cell proliferation and flow cytometry analysis. Expressions of cell cycle regulators were determined by reverse transcriptase polymerase chain reaction analysis and Western blotting, and activation of eyclin-associaled kinases studied using kinase assays. Results: The EEKS suppressed cell proliferation in both HepG2 and Hep3 B cells, but showed a more sensitive anli-proliferative activity in HepG2 cells. Flow cytometry analysis revealed an association between the growth inhibitory effect of EEKS and with G_1 phase cell cycle arrest in HepG2 cells, along with the dephosphorylation of retinoblastoma protein (pRB) and enhanced binding of pRB with the E2 F transcription factor family proteins. Treatment with EEKS also increased the expre ssion of cyclin-dependent kinase (CDK) inhibitors, such as p21WAF1 / CIP1 and p27KIP1.without any noticeable changes in G_1 cyclins and CDKs (except for a slight decrease in CDK4). Treatment of HepG2 cells with EEKS also increased the binding of p21 and p27 with CDK4 and CDK6.which was paralleled by a marked decrease in the cyclin D- and cyclin E-associated kinase activities. Conclusions: Overall, our findings suggest that EEKS may be an effective treatment for liver cancer through suppression of cancer cell proliferation via G_1, cell cycle arrest Further studies arc required to identify the active compounds in EEKS.