Objective To investigate the effect of interferon alpha ( IFN-α) on apoptosis of vascular smooth muscle cells ( VSMCs) in rats and the related mechanism. Methods The cells were divided into three group:group A, group B and group C.Group A was transfected with nonspecific siRNA, group B was intervened with IFN-α and transfected with nonspecific siRNA, and group C was intervened with IFN-α and transfected with IFI204 siRNA. All the cells were cultured for 48 h. The expression of P204 mRNA was determined by semiquantitative reverse transcription polymerase chain reaction (RT-PCR).P204, RAS protein levels, and phosphorylation levels of RAF and ERK were analyzed by Western blotting. The cell apoptosis was analyzed by flow cytometry with Annexin-V FITC/PI method. Results As compared with group A, the expression of P204 mRNA and protein in group B was up-regulated (P<0.05), the cell apoptosis was increased (P<0.05), in the process of the above, the expression of RAS protein was decreased ( P<0.05) and the phosphorylation levels of RAF and ERK were dropped (P<0.05).In group C, the expression levels of P204 mRNA and protein were down-regulated (P<0.05), and cell apoptosis was decreased ( P<0.05) , the expression of RAS protein and the phosphorylation levels of RAF and ERK were increased ( P<0.05) . Conclusion P204 and RAS signal pathway participates in IFN-α regulation of apoptosis of VSMCs in rats.%目的 观察干扰素-α( IFN-α)对大鼠血管平滑肌细胞( VSMCs)凋亡的影响,并探讨其部分机制. 方法 将VSMCs分为A、B、C 3组,A组转染非特异性siRNA,B组予IFN-α干预后转染非特异性siRNA,C组予IFN-α干预后转染IFN诱导蛋白204基因( IFI204) siRNA,均培养至48 h收集细胞. 反转录聚合酶链反应( RT-PCR)法检测IFN诱导蛋白204( P204) mRNA表达,Western blot检测P204、RAS蛋白表达及RAF/ERK磷酸化变化,流式细胞仪Annexin-V FITC/PI法检测细胞凋亡. 结果 与A组比较,B组P204 mRNA和蛋白表达上调(P<0.05),细胞凋亡增多(P<0.05),伴RAS蛋白表达减少(P<0.05),RAF/ERK磷酸化水平下降(P<0.05);C组P204 mRNA及蛋白表达下调(P<0.05),细胞凋亡减少( P<0.05) ,RAS蛋白表达增多和RAF/ERK磷酸化水平上调( P<0.05). 结论 P204及RAS信号途径参与IFN-α诱导大鼠VSMCs凋亡过程的调控.
展开▼
