激活素和卵泡抑素mRNA在肝纤维化形成过程中的作用

目的 观察四氯化碳（ＣＣｌ４）诱导实验性肝纤维化模型大鼠肝纤维化形成过程中激活素（ＡＣＴ）βＡ、βＣ、βＥ及卵泡抑素（ＦＳ）ｍＲＮＡ的表达。方法 ４０％ＣＣｌ４皮下注射制备大鼠实验性肝纤维化模型，注射 ＣＣｌ４后１、２、３、４、５、６、７周分批处死动物，每次 ６～１２只，采用半定量 ＲＴ—ＰＣＲ检测 ＡＣＴ βＡ、βＣ、βＥ亚基及 ＦＳｍＲＮＡ的表达。结果 正常肝脏可检测到ＡＣＴ βＡ、βＣ、βＥ及ＦＳ亚基ｍＲＮＡ，往射ＣＣｌ４２～３周后，βＡ水平下降至检测不到的水平，４周以后，又逐渐升高，注射 ６～７周时其表达水平明显高于正常对照组（Ｐ＜０．０１）；注射ＣＣｌ４１～４周可检测到βＣ亚基ｍＲＮＡ，５～７周后其表达水平明显高于正常对照组（Ｐ＜０．０５）。βＥ亚基ｍＲＮＡ在 ＣＣｌ４注射１～５周后水平下降至检测下到的水平，注射 ６～７周后其表达水平则明显高于正常对照组（Ｐ＜０．０５）。ＣＣｌ４注射后的各个时期均未检测到ＦＳ ｍＲＮＡ表达。结论 肝纤维化形成过程中ＡＣＴ、ＦＳ表达发生了不同的变化，ＡＣＴ—ＦＳ系统失衡可能参与了肝纤维化的形成。

Expression of activins, follistatin mRNA in the development of hepatic fibrosis

OBJECTIVE: To examine the expression changes of activin beta A, beta C, beta E and follistatin mRNA in the development of rat hepatic fibrosis induced by carbon tetrachloride (CCl(4)). METHODS: Hepatic fibrosis was induced in rats by subcutaneous injections of 40% carbon tetrachloride oily solution for a period of 1 to 7 weeks. After carbon tetrachloride injection of 1, 2, 3, 4, 5, 6, and 7 weeks, the 6-12 rats were killed every time. The kinetics of activin beta A, beta C, beta E and follistatin mRNA expression were assessed by the semi-quantity RT-PCR. RESULTS: Activin beta A, beta C, beta E and follistatin mRNA could be detected in normal rat livers. After CCl(4) injection for 2 or 3 weeks, beta A mRNA was transiently decreased and became undetectable, then increased gradually. After CCl injection for 6 and 7 weeks, beta A mRNA level was significantly higher than controls (P<0.01). beta C mRNA could be detected after CCl(4) injection for 1 to 4 weeks and was significantly increased after 5 weeks over controls (P<0.05). beta E mRNA could not be detected after CCl(4) injection for 1 to 5 weeks, but significantly increased after CCl(4) injection for 6 or 7 weeks compared with controls (P<0.01). Except for normal rat liver, no follistatin mRNA was detected in rats after CCl(4) injection. CONCLUSIONS: Activins and follistatin have different expression changes in the development of hepatic fibrosis and the imbalance of activins and follistatin expression may involve in the formation of hepatic fibrosis.