金丝桃素抗乙型肝炎病毒作用及机制的体外研究

目的：从细胞水平评价金丝桃素（HY）的抗乙型肝炎作用，并初步探寻其药物作用靶点。方法选择可分泌乙型肝炎病毒的肝细胞株 HepG2．2．15为实验对象，HY 为 HY 组，拉米夫定（3TC）为3TC 组，去离子水为空白对照组，对细胞进行分组给药。给药72 h 后，采用 Southern 印记杂交及荧光定量 PCR 检测病毒 HBV-DNA 的复制水平；ELISA 检测 HBV 表面抗原（HBsAg）和 HBVe 抗原（HBeAg）的抑制率；采用 Northern blot 与荧光定量 PCR 检测 pgRNA 的表达水平；Western blot 及荧光定量 PCR 检测调控因子肝细胞核因子3（HNF3β）、肝细胞核因子4（HNF4α）、过氧化物酶体增殖激活受体／视黄受 X 受体（PPARα／RXRα）的表达水平。结果与空白对照组相比，HY 组与3TC 组对 HepG2．2．15细胞中的 HBV DNA 及 HBsAg、HBeAg 的表达有明显抑制作用（P ＜0．05）。与空白对照组相比，HY 可显著减少 pgRNA 的表达（P ＜0．05），而3TC 无明显变化（P ＞0．05）。与空白对照组和3TC 组相比，HY 对调控因子 HNF3β与 HNF4α的表达有显著影响（P ＜0．05），但对 PPARα和PXRα的表达无影响（P ＞0．05）。结论 HY 具有强效抗乙型肝炎病毒作用，且其可使负向调控因子 HNF3β的表达升高并降低正向调控因子 HNF4α的表达。提示其药物作用靶点可能为 pgRNA。

In vitro study on anti-HBV effects and mechanism of hypericin

Objective To evaluate the anti-HBV effect of hypericin from the cellular level and to preliminarily explore its po-tential drug target point.Methods Liver cell line HepG2.2.15 cells secreting HBV particles were selected as the experimental ob-jects.Hypericin served as the HY group,lamivudine was taken as 3TC group and deionized water as the blank control group.The cells were grouped and administrated.The HBV-DNA copy level was measured at72 h after medication by Southern blot and fluo-rescent quantitative PCR;the inhibition rate of HBsAg and HBeAg was detected by using ELISA assay;the pgRNA expression level was tested by using Northern blot and fluorescent quantitative PCR;Western blot and fluorescent quantitative PCR were adopted to detect the expression of regulatory factors including HNF3β,HNF4α,PPARαand RXRα.Results Compared to the blank control group,both hypericin and lamivudine had significant inhibiting effect on HBV DNA and expression level of HBsAg and HBeAg in HepG2.2.15 cells (P <0.05).Hypericin could significantly decrease the pgRNA expression compared with the blank control group (P <0.05),while lamivudine had no obvious change (P <0.05).Moreover,hypericin exhibited significant effects on the expression of HNF3βand regulatory factor HNF4αcompared with the blank control group and 3TC group(P <0.05).Conclusion Hypericin represents a strong anti-HBV effect,moreover could increase the negative regulatory factor HNF3βn expression and decreases the positive factor HNF4αexpression,prompting that its drug target point could be pgRNA.