小豆蔻明诱导K562细胞凋亡及其相关凋亡蛋白的表达

目的：探讨小豆蔻明诱导K562细胞凋亡与PTEN、p-Akt、NF-κB、Bcl-2等抑凋亡蛋白及促凋亡蛋白表达量的关系。方法①普通光镜观察小豆蔻明作用K562细胞48h后的细胞形态学变化。②采用MTT法检测小豆蔻明作用K562细胞48h后的凋亡情况，计算IC50。③应用流式细胞仪检测小豆蔻明作用K562细胞48h后的细胞凋亡率。④采用RT-PCR技术检测小豆蔻明作用K562细胞48h后Bcl-2、Bax的mRNA表达量。⑤采用Westernblot技术检测小豆蔻明作用K562细胞48h后PTEN、p-Akt、NF-κB、Bcl-2的蛋白表达量。结果小豆蔻明作用K562细胞48h后，形态学出现明显凋亡现象。MTT提示K562细胞增殖抑制明显且呈量效和时效关系。早期凋亡率与空白组比有显著增加（P＜0.05），呈剂量依赖关系。Bcl-2mRNA的表达较空白组明显下降（P＜0.05），BaxmRNA的表达较空白组明显升高（P＜0.05），呈现浓度依赖性。PTEN蛋白表达量随小豆蔻明的浓度增加明显增加，而p-Akt、NF-κB、Bcl-2蛋白表达量则减少。结论小豆蔻明通过增加PTEN蛋白的表达量，同时下调p-Akt、NF-κB、Bcl-2蛋白的表达量促进K562细胞的凋亡，且呈剂量依赖性。

Apoptotic Effects of Cardamonin on K562 and its expressions of related apoptosis proteins

ObjectiveTo observe the apoptotic effect of cardamonin on K562 cells and its relationship with the expressions of PTEN, p-Akt, NF-κB and Bcl-2.Methods K562 cells were treated with cardamonin for 48 h, and the following tests were performed：（1） The cell morphology was observed by light microscopy.（2）IC50 of the K562 cells was dtermined by MTT test.（3） The apoptosis rate was detected by flow cytometry.（4） The expressions of Bcl-2 and Bax mRNA were detected a by RT-PCR.（5） The expressions of PTEN, p-Akt, NF-κB and Bcl-2 proteins were detected by Western blot.Results Obvious apoptosis was observed in the K562 cells after treated with cardamonin for 48 h.MTT assay indicated that the proliferation of K562 cells was obviously inhibited in a dose-and time-dependent manner. Comparing with the blank group, the early apoptosis rate and expression of Bax mRNA were significantly increased.At the same time, the expression of Bcl-2 mRNA was significantly decreased.All of them presented a dose-dependent manner. The expression of PTEN obviously increased with the increasing dose of cardamonin and the expressions of p-Akt, NF-κB and Bcl-2 were decreased.Conclusions Cardamonin promotes the apoptosis in K562 cells in a dose-dependent manner by increasing the expression of PTEN and decreasing the expressions of p-Akt, NF-κB, and Bcl-2.