18α-甘草酸二铵对丝裂霉素C诱导的HepG2细胞凋亡的影响及机制

Inhibition of diammonium glycyrrhizinate on mitomycin C-induced apoptosis in HepG2 cells via apoptotic pathway

目的探讨18α-甘草酸二铵对丝裂霉素(MMC)诱导的HepG2细胞凋亡的影响及机制。方法 18α-甘草酸二铵不同浓度与低剂量MMC(50μg/ml)MMC联合作用,采用MTT比色法观察MMC对HepG2细胞活性率的影响;流式细胞术分析凋亡细胞的百分率、线粒体膜电位的改变及Caspase-3的活性变化;Western Blot检测细胞内细胞色素C的表达及凋亡相关蛋白Bcl-2/Bax的表达情况。结果单独MMC(50μg/ml)处理的HepG2细胞活性率明显降低,凋亡率显著增加,线粒体膜电位下降,Caspase-3活性增加,细胞内细胞色素C表达增加,抗凋亡蛋白Bcl-2表达减少,而促凋亡蛋白Bax表达增加。不同浓度的18α-甘草酸二铵与MMC合用组,这些指标的变化均受到抑制。结论 18α-甘草酸二铵可抑制MMC诱导的HepG2细胞凋亡,其机制可能通过调控凋亡相关蛋白的表达而实现。

Objective To study the inhibition of diammonium glycyrrhizinate on mitomycin C-induced apoptosis in HepC-2 cells via apoptotic pathway. Methods Low dose MMC（50 μg/ml） was used to induce the apoptosis of HepG2 cells. Dose-independent inhibition effect of diammonium glycyrrhizinate on MMC-induced apoptosis was determined. MTT method was used to detect the cell survival rates. Flow cytometry was applied to assess cell apoptosis, mitochondrial membrane permeability and Caspase-3 activity. Western Blot was used to check the expression of apoptosis-related proteins cytochrome C, Bcl-2 and Bax. Results The viability of HepG2 cells decreased significantly after being treated with low dose （50μg/ml） MMC and apoptosis of HepG2 cells was induced, which might be the outcome of up-regulated expression of pro-apoptotic Bax protein and eytochrome C, down-regulated expression of anti-apoptotic Bcl-2, subsequent Caspase-3 activation and loss of mitochondrial transmembrane potential. But these changes were obviously inhibited by diammonium glycyrrhizinate. Conclusion Diammonium glycyrrhizinate can inhibit MMC-induced HepG2 cell apoptosis via regulation of apoptotic pathway.