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Expression of Cathepsin-B and -D in Rat's Brain after Traumatic Brain Injury
Author(s): 
Pages: 404-406,410,封2
Year: Issue:  6
Journal: JOURNAL OF FORENSIC MEDICINE

Keyword:  脑外伤溶酶体cathepsin-Bcathepsin-Dcaspase-3;
Abstract: 目的 研究大鼠脑外伤后溶酶体酶cathepsin-B和-D是否被激活及其不同时段表达变化,阐述其与凋亡执行因子caspase-3表达的关系,并探讨对脑外伤诊断及形成时间的意义.方法 采用自由落体打击法建立脑外伤动物模型,并对模型及对照样本进行免疫荧光、双标和激光共聚焦检测,结果 用SPSS10.0软件处理.结果脑外伤后1 h cathepsin-B表达即增加,4~8 d达高峰,脑外伤后32 d仍处于高表达水平;cathepsin-D的表达于脑外伤后12h增加,4~8d达高峰,32d的表达仍然高于12h的表达水平.脑外伤初期,cathepsin-B和-D阳性细胞与caspase-3阳性细胞重叠较少,脑外伤后6h开始增加,32d仍然有很多阳性细胞重叠.结论 脑外伤后cathepsin-B和-D被激活,其激活在脑外伤早期可能抑制细胞凋亡执行因子caspase-3的激活,之后(6h后)则与caspase-3起协同作用,共同促进细胞死亡;cathepsin-B和-D表达的时程变化对于脑外伤的法医学诊断和中晚期的时间推断有参考意义.
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