垂盆草总黄酮影响肝星状细胞凋亡的作用机制研究

目的:研究垂盆草总黄酮(SSTF)对大鼠肝星状细胞(HSC-T6)凋亡的影响及其作用机制。方法:将不同质量浓度的SSTF与HSC-T6细胞共培养不同时间后,MTT法检测SSTF对HSC-T6细胞的增殖抑制作用;流式细胞仪Annexin-V/PI双染方法检测SSTF对HSC-T6细胞凋亡的影响;应用Western blotting和Real-time PCR方法观察药物对凋亡相关细胞因子Bcl-2,Bax和Caspase-3蛋白及mRNA表达的影响。结果:SSTF能显著抑制HSC-T6细胞增殖、诱导细胞凋亡,且呈剂量和时间依赖;Western blotting结果显示,SSTF通过抑制Bcl-2,促进Bax和Caspase-3蛋白表达促进细胞凋亡;进一步采用Real-time PCR研究发现,Bcl-2能够从mRNA水平抑制Bcl-2、促进Bax和Caspase-3表达。结论:SSTF具有促进HSC-T6凋亡的作用,这种作用的发挥主要是通过抑制Bcl-2、促进Bax和Caspase-3蛋白和mRNA的表达实现的。

Study on effect of total flavanones of Sedum sarmentosum on apoptosis of hepatic stellate cells and its mechanism

Objective: To study the effect of total flavanones of Sedum sarmentosum (SSTF) on the apoptosis of rat hepatic stellate cells (HSC-T6) and its mechanism. Method: Different concentrations of SSTF and HSC-T6 cells were co-cultured for different period of time. The MTT assay was used to detect the inhibitory effect of SSTF on the proliferation of HSC-T6 cells. The flow cytometry Annexin-V/PI double staining method was adopted to detect SSTF's effect on HSC-T6 cell apoptosis. Western blotting and Real-time PCR methods were applied to observe the effect on the protein and mRNA expressions of apoptosis-related cytokines Bcl-2, Bax and Caspase-3. Result: SSTF significantly inhibited HSC-T6 cell proliferation and induced cell apoptosis in a dose and time dependent manner. According to Western blotting result, SSTF promoted apoptosis by inhibiting Bcl-2, Bax and promoting the protein expression of Caspase-3; according to a further Real-time PCR study, Bcl-2 mRNA levels can inhibit Bcl-2 and promote Bax and Caspase-3 expressions. Conclusion: SSTF has the effect of promoting the apoptosis of HSC-T6 mainly by inhibiting Bcl-2 and promoting protein and mRNA expressions of Bax and caspase-3.