Effects of emodin on proliferation cycle and apoptosis of human bladder cancer cell line BIU87 / 中国医师杂志

ABSTRACT

ObjectiveTo study the suppressive role of emodin on the growth and its effect on the proliferation cycle and apoptosis of human bladder cancer cell line BIU87.MethodsThe effect of different concentration of emodin at different time point on cell proliferation of BIU87 were measured with methylthiazole (MTT) chromatometry, the cell proliferation cycle were detected with flow cytometry, expressions of bc1-2 and caspase-3 were detected by SP of immunohistochemistry.ResultsWithin a certain range, the higher concentration of emodin (10 ～ 80 μg/ml) and the longer action time are positive related the more significant inhibition of tumor cell growth and the higher apoptosis rate [(9.84 ± 1.13)％, (18.32 ±2.14)％ ,(29.73+1.42)％ ,(42.13 +2.36)％ ,respectively].Compared with control group [(2.01 ±0.92)％], the differences were statistically significant(F =531.85, P ＜0.01).Emodin could inhibit the proliferation of human bladder cancer cell BIU87 by blocking BIU87 cell in G0/G1 stage, thus cut down cell proportion in stage of S [(33.27 +1.26)％ ,(29.17 ±1.39)％, (16.94 ±0.86)％ ,(10.85 ± 1.47)％,respectively], compared with the control group [(35.45 ± 0.38) ％], the differences were statistically significant(F =524.64, P ＜0.01).After 48 h of emodin treatment, the bc1-2 expression(Grayscale values122.65 + 2.12,131.37 ± 1.62,134.81 ± 1.36,145.55 ± 2.01, respectively) was decreased and the caspase-3 expression(Grayscale values 135.26 + 1.41,130.22 ± 1.74,126.11 ± 1.77,118.36 + 1.53, respectively) was increased in a dose dependent manner.Compared with control group (Grayseale values108.42 + 3.73,149.35 ± 1.82, respectively), the differences were statistically significant (F = 216.23,224.83, P ＜0.01).ConclusionsEmodin could significantly inhibit the growth and induce apoptosis of BIU87 cells in vitro, which may be through down regulation of bc1-2, and up regulation of caspase-3, and blocking BIU87 cell in G0/G1 stage.