金属蛋白酶组织抑制因子-2在大鼠肝组织中的定位及表达

用人血白蛋白攻击的方法制备实验性免疫性肝纤维化大鼠模型，以正常大鼠为对照。采用免疫化法及原位杂交技术分别检测肝脏中金属酶组织抑制因子－2在正常及实验性免疫性肝纤维化大鼠肝组织中的定位及表达状态。结果为实验组肝脏中TIMP－2mRNA和相关抗原表达在肌纤维细胞、成纤维细胞，以汇管区及纤维间隔中最明显，阳性信号位于细胞胞浆中，未见细胞核表达。提示在肝纤维化中，成纤维细胞及肌成纤维细胞是TIMP－2表达的主要细胞，并随着病损肝脏中肝纤维化程度的加重，TIMP－2基因和蛋白表达水平随之增高。

THE LOCALIZATION AND EXPRESSION OF TIMP-2 IN EXPERIMENTAL HEPATIC FIBROSIS IN RAT

An experimental immunity hepatic fibrosis rat model was prepared by means of immunologic assault with human serum albumin, and normal rats served as a control group. The immunohistochemistry methods and in situ hybridization were respectively used to detect TIMP 2 mRNA and related antigens in the liver,and to investigate the localization and expression of TIMP 2 in the liver of both normal and experimental hepatic fibrosis rats. The results showed that TIMP 2 mRNA and related antigens in the livers of experimental group were expressed in myofibroblasts and fibroblasts, especially in the portal area and fibrous septum. The positive signal was located in the cytoplasm, but not in the nucleus. On the other hand, there was a high level of expression of TIMP 2 in the liver of the experimental group.It is suggested that in the process of hepatic fibrosis, fibroblasts and myofibroblasts are the major cells expressing TIMP 2. The severer the hepatic fibrosis in the injured liver is, the higher the levels of TIMP 2 related antigens and gene expression are.