Effects of oleanolic acid on apoptosis and cell cycle of HL-60 cells in vitro / 中国病理生理杂志

ABSTRACT

AIM:To study the mechanism of oleanolic acid induced apoptosis and its influence on cell cycle in HL-60 cells in vitro.METHODS:The HL-60 cells were treated with different concentrations of oleanolic acid and then cultured for 12 h,24 h,48 h and 72 h,respectively.MTT assay was used to evaluate the inhibitory effect of oleanolic acid on HL-60 cells in vitro.The argarose gel electrophoresis was used to detect the chromatin DNA fragmentation.FACS was used to analyze the cell cycle of HL-60 cells.Western blotting was used to detect the activation of caspase-3 which has been confirmed the last execution of apoptosis pathway.RESULTS:MTT assay showed that oleanolic acid dramatically inhibited the growth of HL-60 cells in vitro,more than 50% HL-60 cells were inhibited when the cells were treated with 80 ?mol/L oleanolic acid for 48 h;the apparent DNA ladder was detected after exposure of HL-60 cells to oleanolic acid for 48 h.FACS analysis showed that cell cycle of HL-60 cells was arrested in G1 phase,the inhibition ratio of HL-60 cells achieved 63.24% and 67.90% after treated with oleanolic acid for 48 h and 72 h correspondingly.Western blotting detected the activation of caspase-3 after exposure of HL-60 cells to 80 ?mol/L oleanolic acid for 48 h.CONCLUSION:These results suggest that oleanolic acid induces apoptosis and the cell cycle of HL-60 cells is arrested in G1 phase.