他莫昔芬诱导体内外雌激素受体阳性乳腺癌细胞凋亡的周期特异性研究

The Study of Cell-cycle Specificity of Tamoxifen-induced Apoptosis in the ER(+) Breast Cancer Cells

目的研究他莫昔芬(TAM)诱导不同生长状态下雌激素受体阳性(ER(+))乳腺癌细胞凋亡的周期特异性并比较其差异。方法体外培养的ER(+)乳腺癌细胞株MCF-7细胞株和原代培养的ER(+)乳腺癌细胞用TAM作用后,在流式细胞仪(FCM)上用亚G1峰(sub-G1)法检测细胞凋亡率,用细胞周期特异性细胞凋亡检测法(API)检测细胞凋亡的周期特异性。结果TAM诱导不同生长状态的ER(+)乳腺癌细胞凋亡均为G0/G1期发生的周期特异性细胞凋亡,但TAM在体外诱导的乳腺癌细胞凋亡率高于在体乳腺癌细胞。结论在ER(+)乳腺癌细胞中TAM在G0/G1期特异性诱导细胞凋亡,但在不同的生长状态下,TAM诱导细胞凋亡的效率不同。

Objective To study the cell-cycle specificity of tamoxifen-induced apoptosis in the ER(+) breast cancer cells in vitro and in vivo. Methods ER(+) MCF-7 cell line (in vitro) and primary cultured ER(+) breast cancer cells (in vivo) were treated with tamoxifen, and the cell cycle specificity of cell apoptosis and the apoptotic rate were dertermined by flow cytometry. Results Both MCF-7 and primary cultured breast cancer cells were induced to apoptosis with G 0/G 1 phase specificity by tamoxifen. And the apoptotic rate in MCF-7 was higher than that in primary cultured breast cancer cells. Conclusion Tamoxifen could induced G 0/G 1 phase specific apoptosis in the ER(+) breast cnacer cells, and tamoxifen-induced apoptotic rate was higher in vitro than in vivo.