康莱特注射液对人乳腺癌MCF-7细胞增殖和凋亡的影响

摘要

目的：观察康莱特注射液对人乳腺癌MCF-7细胞增殖、细胞周期和凋亡的影响,并探讨其作用机制。方法取对数生长期人乳腺癌 MCF-7细胞,分为对照组和康莱特不同浓度组(10、20、40μL/mL)。RPMI-1640培养基培养24 h后药物处理,采用MTT法检测康莱特注射液对MCF-7细胞增殖抑制率,流式细胞仪检测细胞周期和细胞凋亡,Hochest荧光染色法检测细胞核变化,ELISA及Western blot检测Bcl-2、Bax蛋白表达。结果康莱特注射液作用12、24、48 h 对 MCF-7细胞增殖均有显著的抑制作用(P＜0.05,P＜0.01)；与对照组比较,康莱特注射液作用48 h后G1/G0、G2/M期细胞比例增加(P＜0.001,P＜0.01),S期细胞比例下降(P＜0.01),细胞凋亡率升高(P＜0.05,P＜0.001),Bcl-2蛋白表达明显降低、Bax蛋白表达明显升高(P＜0.01,P＜0.001)。结论康莱特注射液能抑制人乳腺癌MCF-7细胞增殖,阻滞细胞周期,诱导细胞凋亡,其机制与降低Bcl-2蛋白表达和增加Bax蛋白活性有关。%Objective To investigate effects of Kanglaite injection on proliferation, cycle and apoptosis of human breast cancer MCF-7 cells;To discuss its relevant mechanism. Methods Logarithmic growth phase cells were divided into control group and Kanglaite-treatment group (10, 20, 40μL/mL). Cells were cultured in RPMI-1640 for 24 h before drug treatment. The inhibition rate of Kanglaite injection on proliferation of human breast cancer MCF-7 cells was detected by MTT assay. Apoptosis and cell cycle of MCF-7 cells were detected by flow cytometry. Changes in cell nucleus were determined by Hochest staining assay. Protein expressions of Bcl-2 and Bax were detected by ELISA and Western blot. Results Kanglaite injection for 12 h, 24 h or 48 h resulted in a significant inhibition of MCF-7 cells proliferation (P<0.05, P<0.01);Compared with the control group, Kanglaite injection-treated cells showed increased percentage in G2/M and G0/G1 phases (P<0.001, P<0.01), but showed decreased percentage in S phase (P<0.01), and apoptosis rate increased (P<0.05, P<0.001). Kanglaite injection significantly decreased protein expression of Bcl-2, and enhanced protein expression of Bax of MCF-7 cells (P<0.01, P<0.001). Conclusion Kanglaite injection can inhibit the proliferation of human breast cancer MCF-7 cells, decrease cell cycle and induce apoptosis, the mechanism is related with decreasing protein expression of Bcl-2 and enhance the protein expression of Bax.