三七总皂苷对大鼠肝脏药物代谢酶酶活性、mRNA及蛋白表达的影响

研究三七总皂苷对大鼠肝脏药物代谢酶酶活性、mRNA及蛋白表达的影响。将Wistar雄性大鼠随机分为9组,给予受试药后,提取肝脏微粒体,肝脏总RNA和总蛋白,分别采用底物探针法、荧光定量PCR技术和Western blot,检测三七总皂苷对肝脏药物代谢酶相关亚型酶活性、mRNA和蛋白质表达3个水平的调节作用。实验的结果是三七总皂苷能显著诱导CYP1A2和CYP2E1酶活性和mRNA表达,同时对CYP2E1的蛋白表达水平也有显著诱导作用;三七总皂苷显著诱导CYP3A mRNA表达,但对CYP3A酶活性水平无明显的影响;三七总皂苷对CYP1A1和CYP2B mRNA表达和酶活性均无明显影响。三七总皂苷对不同的P450亚型的调节作用具有选择性,主要的调节亚型是CYP1A2和CYP2E1,临床应用时,尤其是与CYP1A2和CYP2E1代谢有关药物合用时,应充分考虑到可能产生的药物相互作用以避免潜在的不良反应和毒副作用,同时对CYP2E1的诱导作用是否与人参皂苷清除自由基作用有关值得进一步研究。

Effect of Panax notoginseng saponins on liver drug metablic enzyme activity, mrna and protein expressions in rats

To study the effect of Panax notoginseng saponins(PNS) on liver drug metabolic enzyme activity, mRNA and protein expressions in rats. Male Wistar rats were randomly divided into nine groups. After administration of the test drugs, their liver microsomes, liver total RNA and total protein were extracted to detect the regulating effect of PNS on liver drug metabolic enzyme activity-related subtype enzymatic activity, mRNA and protein expression by substrate probe, quantitative PCR and Western Blot technology. The result of this experiment was that PNS could significantly induce CYP1A2 and CYP2E1 enzyme activity, mRNA expression, CYP2E1 protein expression level. PNS significantly induced CYP3A mRNA expression, but with no significant effect in CYP3A enzyme activity level. PNS had no significant effect CYP1A1 and CYP2B mRNA expressions and enzyme activity levels. PNS had selective regulations on different P450 subtypes, and the major subtypes were CYP1A2 and CYP2E1. In clinical practice, particularly in the combination with CYP1A2 and CYP2E1 metabolism-related drugs, full consideration shall be given to the possible drug interactions in order to avoid potential toxic and side effects. Meanwhile, whether the induction effect of CYP2E1 gets involved in ginsenoside's effect incavenging free radicals deserves further studies.