黄芪汤组分抑制胆汁淤积性肝纤维化大鼠胆管上皮细胞增殖及其转分化的效应

Huangqi decoction inhibits cholangiocyte proliferation and transdifferentiation in cholestatic liver fibrosis induced by BDL in rats

目的探讨胆管上皮细胞增殖及其转分化在肝纤维化形成过程中的作用及黄芪汤组分抑制肝纤维化的效应和机制。方法30只SD雄性大鼠采用胆总管结扎制备胆汁淤积性肝纤维化模型，假手术对照组仅对胆总管作分离，不结扎。胆管结扎术后1周随机分为模型对照组和药物干预组（经灌胃给予黄芪汤组分4周），5周后麻醉下处死大鼠，获取肝组织与血清标本。检测肝功能、肝组织学及羟脯氨酸（Hyp）含量；激光共聚焦显微镜观察肝组织角蛋白-7（CK7）与α-平滑肌肌动蛋白（仅SMA）共定位，Westernblot检测CK7、α-SMA蛋白表达。计量资料比较采用单因素方差分析中的LSD法或非参数检验中的H检验进行统计学分析，计数资料采用Radit检验，CK7与α—SMA蛋白表达间关系采用直线回归与相关分析。结果与假手术对照组比较，模型对照组大鼠病死率33．3％，腹水出现率90％，肝功能显著异常，肝组织肝细胞显著减少，胆管上皮细胞及纤维组织大量增生，肝组织Hyp含量、CK7及α-SMA蛋白表达显著增加（尸值均〈0．01），并有大量的CK7及OCSMA共定位阳性细胞表达。与模型对照组比较，药物干预组大鼠病死率、腹水出现率及脾脏质量均显著降低（P值均〈0．05），肝功能显著改善，肝组织肝细胞减少及胆管上皮细胞与纤维增生程度轻，CK7与αSMA共定位阳性细胞显著臧少。药物干预组与模型对照组大鼠肝Hyp含量分别为（1026．8±132．47）ug／g和（887．4±95．56）μg／g，CK7表达量分别为0．812±0．298和0．318±0．143，dSMA蛋白表达量分别为0．787±0．277和0．341±0．119，差异均有统计学意义（JD值均〈0．01）。结论黄芪汤组分可有效抑制胆管结扎大鼠胆管上皮细胞增生及胆管上皮细胞向α-SMA阳性的肌成纤维细胞的转分化。

Objective To elucidate the antifibrotic mechanism of Huangqi decoction in rats with BDL-induced cholestatic liver fibrosis. Methods Liver fibrosis model was induced by ligating the common bile duct （BDL） in rats. Sham-operation was performed in control rats. The BDL rats were randomly devided into two groups： the BDL group and the Huangqi decoction group. Huanqi decoction was given intragastrically for 4 weeks. At the end of the fifth week after BDL, animals were sacrificed. Results Compared with the sham control group, mortality rate in BDL group was 33.3% and incidence rate of ascites was 90%, and hepatic function was abnormal in most of the rats in BDL group. The number of Hepatocytes was decreased and the number of cholangiocytes significantly increased in BDL group. In addition, Hyp content of liver tissue and protein expression of CK 7 and α-SMA were significantly increased, Immunostaining indicated that CK 7 and α -SMA were co-localized in BDL group. These changes were markedly suppressed by the Huangqi decoction. Conclusions These observations suggest that Huangqi decoction can inhibit cholangiocyte proliferation and cholangiocyte transdifferentiation.