8－溴乙氧基大黄酸的合成及其对肝癌 HepG2．2．15细胞乙肝病毒抑制作用的研究

摘要

Aim To synthesize 8-bromo-ethoxy Rhein and investigate its mechanisms and inhibition effect on hepatitis B surface antigen ( HBsAg ) and e antigen ( HBeAg) in HepG2.2.15 cells.Methods 8-bromo-ethoxy Rhein was synthesized based on the chemical structure of Rhein , and its structure was identified by IR,1 H-NMR and 13 C-NMR spectra.MTT assay was used to test the inhibitory effect of 8-bromo-ethoxy Rhein on HepG2.2.15 cells.After the cells treatment by 8-bromo-ethoxy Rhein , the HBsAg and HBeAg in cell supernatant were detected by ELISA .The expres-sion of hepatitis B virus X gene ( HBx) was detected by Western blot .The cell cycles were examined with flow cytometry.The intracellular free calcium concentration was detected by laser scanning confocal microscopy . Results The structure of 8-bromo-ethoxy Rhein was confirmed by IR,1 H-NMR and 13 C-NMR.MTT results showed that synthetic product and Rhein could inhibit the cell proliferation in HepG2.2.15 cells.After trea-ted with 8-bromo-ethoxy Rhein and Rhein for 72 h,the half inhibitory concentration 50%( IC50 ) was 14.29 mg・ L-1 and 11.59 mg・ L-1 , respectively .Using non-cytotoxic dose of 8-bromo-ethoxy Rhein , the inhibitory effect on HBsAg and HBeAg was gradually enhanced with increasing 8-bromo-ethoxy Rhein concentration . The inhibitory effect of synthetic product on hepatitis B virus was better than that of Rhein .8-bromo-ethoxy Rhein could down-regulate the expression of HBx , in-tracellular calcium ion concentration and block the hepatitis B virus ( HBV ) replication.Flow cytometry results showed 8-bromo-ethoxy Rhein didn′t affect the cell cycle .Conclusions Compare with Rhein , the synthesis of 8-bromo-ethoxy Rhein shows stronger inhi-bition on hepatitis B virus in HepG2.2.15, and its mechanisms may involve down-regulating the expres-sion of HBx and reducing calcium ion concentration .%目的：合成8－溴乙氧基大黄酸，探讨8－溴乙氧基大黄酸对肝癌HepG2．2．15细胞分泌的乙型肝炎病毒表面抗原（HBsAg）和e抗原（HBeAg）的抑制作用和机制。方法以大黄酸为结构基础，化学全合成8－溴乙氧基大黄酸，采用红外光谱（IR）、核磁共振氢谱（1H－NMR）及碳谱（13C－NMR）对其结构进行表征；MTT法测定8－溴乙氧基大黄酸对细胞生长的抑制作用；ELISA检测HepG2．2．15细胞分泌的HBsAg和 HBeAg；Western blot 法检测细胞内乙肝病毒 X 基因（ HBx）蛋白的表达；流式细胞仪分析细胞周期；激光共聚焦显微镜测定细胞内游离钙离子浓度。结果 IR、1 H－NMR和13 C－NMR的结果确证合成产物为8－溴乙氧基大黄酸，合成产物和大黄酸对HepG2．2．15细胞具有较好的抑制细胞生长的作用，作用72 h后IC50分别为14．29 mg・ L－1和11．59 mg・ L－1。采用无细胞毒剂量的8－溴乙氧基大黄酸处理细胞后，对细胞分泌的HBsAg和HBeAg有抑制作用，其抑制作用随着浓度的增加，呈现剂量依赖性，且合成产物的抑制效果优于大黄酸；8－溴乙氧基大黄酸可降低HBx蛋白表达水平和细胞内钙离子浓度，阻碍乙型肝炎病毒（ HBV ）复制，但不影响细胞周期。结论本研究合成的8－溴乙氧基大黄酸显示了比大黄酸更为优越的抑制HepG2．2．15细胞HBsAg和HBeAg的分泌作用的活性，其作用机制可能是通过降低HBx蛋白表达、减少钙离子浓度而实现。