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Relationship of changes in basement membrane of microvessels after cerebral ischemia/reperfusion and plasminogen activator system in aged rats
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- Author:
- No author available
- Journal Title:
- CHINESE CRITICAL CARE MEDICINE
- Issue:
- 11
- DOI:
- 10.3760/j.issn:1003-0603.2005.11.005
- Key Word:
- 老龄;大鼠;缺血-再灌注,脑;微血管基底膜;细胞外基质;纤溶酶原激活系
Abstract： 目的研究老龄大鼠脑缺血-再灌注(I/R)不同时期微血管基底膜损伤与纤溶酶原激活系的关系.方法采用大脑中动脉阻塞(MCAO)线栓法制备大鼠局灶性脑I/R模型,将大鼠分为青年假手术组、老龄假手术组、青年模型组和老龄模型组,其中模型组又分为I 3 h,I/R 6、12、24、72和144 h各时间点组.采用免疫组化、酶谱与反向酶谱分析等方法测定各脑微血管结构、基底膜Ⅳ型胶原、层连蛋白(LN)和纤溶酶原激活系的变化.结果与青年假手术组比较,老龄假手术组Ⅳ型胶原、LN表达增强.随着I/R时间的延长,老龄与青年大鼠基底膜成分Ⅳ型胶原和LN表达递减;组织型纤溶酶原激活剂(t-PA)、尿激酶型纤溶酶原激活剂(u-PA)、纤溶酶原激活物抑制剂(PAI-1)表达水平呈先增强后降低的趋势.与青年模型组相同时间点比较,老龄模型组Ⅳ型胶原(I 3 h、I/R 6 h、I/R 12 h)、LN(I 3 h、I/R 6 h～24 h)、t-PA(I/R 6 h～24 h)、u-PA(I/R 12 h～144 h)表达增强,PAI-1(I/R 12 h、I/R 24 h)表达降低,差异均有显著性.另外,PAI-1的反向酶谱分析比较,量的变化与免疫表达规律基本一致.结论随着增龄,大鼠脑微血管基底膜成分Ⅳ型胶原、LN增加.在脑I/R微血管基底膜损伤方面,老龄大鼠较青年严重,其损伤的特点与纤溶酶原激活系变化有关.
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