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DMN诱发大鼠肝硬化模型MMP-2活性的动态变化

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Author:: No author available

Journal Title:: WORLD CHINESE JOURNAL OF DIGESTOLOGY

Issue:: 7

DOI:: 10.3969/j.issn.1009-3079.2005.07.022

Key Word:: No keyword available

Abstract：目的:探讨二甲基亚硝胺(Dimethylnitrosamine,DMN)诱发大鼠肝硬化过程中Ⅳ型胶原、Ⅳ型胶原酶(MMP-2)活性及基质金属蛋白酶抑制物-2(TIMP-2)表达的动态变化.方法:采用DMN诱发大鼠肝硬化模型,设2 d,1,2,3,4,5,6,8,12,24 wk共10个观察点,分别用生化方法测定其肝组织羟脯氨酸(hydroxyproline,Hyp)含量、血清丙氨酸氨基转移酶(alanine aminotransferase,ALT)活性和白蛋白(albumin,ALB)含量,Envision两步法(免疫组化)测定肝组织Ⅳ型胶原和TIMP-2表达,酶图法测定肝组织MMp-2活性.结果:模型大鼠肝组织Hyp、Ⅳ型胶原含量,血清ALT活性显著高于正常组,ALB含量显著低于正常组.2 d时MMp-2活性显著高于正常组,然后在正常范围内波动.正常组和8 wk以前各组模型大鼠TIMP-2表达微弱,12 wk表达明确,24 wk表达增强.结论:DMN诱发Wistar大鼠肝硬化模型形成前后MMP-2功能主要通过蛋白分泌量和活化量调节而实现,此期肝窦基底膜Ⅳ型胶原含量主要通过MMP-2活性调节,和蛋白分泌及TIMP-2表达关系不大.在肝硬化恢复期TIMP-2调节的重要性逐渐上升,故TIMP-2表达量是肝硬化时肝窦毛细血管化能否恢复的关键因素之一.

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