脾切除对肝纤维化大鼠肝脏PDGF-B表达及血清PDGF-BB水平的影响

目的 研究脾切除对肝纤维化大鼠肝脏PDGF-B表达和血清PDGF-BB水平的影响,探讨脾切除在肝纤维化治疗中的作用.方法 大鼠皮下注射CCl4,建立65只肝纤维化大鼠模型.于建模开始、肝纤维化期以及肝硬化期三组切除大鼠睥脏,并设立同期假手术组作为对照组.第一、二组及其对照组于建模后第10周,第三组及其对照组于建模后12周分别取大鼠肝脏和血液标本.用免疫组化SABC法测定肝脏PIGF-B的表达.HE染色检测肝纤维化,用双抗体夹心ELISA法测定血清PIGF-BB水平.结果 各切脾组PDGF-B阳性细胞A值(光密度值)明显低于其对照组;各切脾组血清PDGF-BB含量明显低于其对照组.根据HE染色,建模开始时切脾再行肝纤维化诱导,肝纤维化进程缓慢;建模第5周切脾后,肝脏病理状态比对照组明显缓解;肝硬化期切脾后,肝脏炎性改变和纤维化程度有一定减轻.结论 早期脾脏切除对实验性肝纤维化有一定延缓作用.脾切除后PDGF水平的下降可能是造成该延缓的机制之一.

Abstract：

Objective To explore the effects of splenectomy on hepatic fibrosis and on the expression of PDGF-B in the liver and PDGF-BB in the serum of rats with hepatic fibrosis. Methods By hypodermic injection CCl4, we established 65 rat models with hepatic fibrosis, splenectomies were performed in the three groups at different phases: before hypodermic injection CCl4 (A group), five weeks after hypodermic injection CCl4 (B group), and ten weeks hypodermic injection CCl4 (C group). The control groups were established at the same time, with samples of the livers and serum of the rats taken in different phases. The expressions of PDGF in the liver were detected by immunohistochemistry technique and the degree of hepatic fibrosis was detected by HE staining. The serum levels of PDGF-BB were analyzed by ELISA technique. Results Absorbance values of PDGF-B in the experimental group were significantly lower than the control groups (P＜0. 05). Serum levels of PDGF-BB of the rats after splenectomy were significantly lower than those in the control groups (P＜0.05). HE and Masson's staining showed that the progression of Hepatic fibrosis was slow in the A group. Hepatic pathologic state was significantly relieved in the B group and the inflammation and fibrosis was relieved in the C group. Conclusion Earlier period splenectomy could delay the proceeding of experimental hepatic fibrosis. After splenectomy the decline in the level of PDGF may be one of the mechanisms causing the delay.

Effects of splencectomy on the expression of PDGF-B in the live and the serum level of PDGF-BB of the rats with hepatic fibrosis

Objective To explore the effects of splenectomy on hepatic fibrosis and on the expression of PDGF-B in the liver and PDGF-BB in the serum of rats with hepatic fibrosis. Methods By hypodermic injection CCl4, we established 65 rat models with hepatic fibrosis, splenectomies were performed in the three groups at different phases: before hypodermic injection CCl4 (A group), five weeks after hypodermic injection CCl4 (B group), and ten weeks hypodermic injection CCl4 (C group). The control groups were established at the same time, with samples of the livers and serum of the rats taken in different phases. The expressions of PDGF in the liver were detected by immunohistochemistry technique and the degree of hepatic fibrosis was detected by HE staining. The serum levels of PDGF-BB were analyzed by ELISA technique. Results Absorbance values of PDGF-B in the experimental group were significantly lower than the control groups (P＜0. 05). Serum levels of PDGF-BB of the rats after splenectomy were significantly lower than those in the control groups (P＜0.05). HE and Masson's staining showed that the progression of Hepatic fibrosis was slow in the A group. Hepatic pathologic state was significantly relieved in the B group and the inflammation and fibrosis was relieved in the C group. Conclusion Earlier period splenectomy could delay the proceeding of experimental hepatic fibrosis. After splenectomy the decline in the level of PDGF may be one of the mechanisms causing the delay.