脑出血大鼠血肿周围组织细胞凋亡与胱冬酶-3和程序性细胞死亡分子-5蛋白表达

Apoptosis and the expressions of caspase-3 and programmed cell death 5 protein in perihematoma tissue after intracerebral hemorrhage in rats

目的 观察脑出血大鼠脑血肿周围组织细胞凋亡及其与胱冬酶-3和程序性细胞死亡分子-5（programmed cell death-5,PDCD-5）蛋白表达之间的关系,探讨脑出血后的损伤机制.方法 54只雄性wistar大鼠,随机分为假手术组和脑出血组,后者又分为3 h、6 h、12 h、1 d、2 d、3 d、5 d和7 d等8个亚组,每组6只.自体尾动脉不凝血50μl注入尾状核区建立脑出血模型,TUNEL法检测细胞凋亡,免疫组化法观察胱冬酶-3和PDCD-5蛋白表达.结果 脑出血大鼠血肿周围组织3 h出现凋亡细胞,2～3 d达高峰,3 d后凋亡细胞数量开始下降.血肿周围组织3 h可见胱冬酶-3和PDCD-5蛋白阳性细胞,1～2 d达高峰,3 d后逐渐减少.脑出血大鼠血肿周围组织胱冬酶-3（r=0.971,P＜0.01）和PDCD-5（r=0.334,P＜0.01）阳性细胞数量与凋亡细胞数量呈正相关.结论 脑出血大鼠血肿周围组织存在细胞凋亡,且与胱冬酶-3和PDCD-5蛋白表达一致,胱冬酶-3和PDCD-5蛋白可能促进脑出血后血肿周围组织细胞凋亡.

Objective To observe apoptosis and its relationship between the expression of caspase-3 and programmed cell death 5 （PDCD5） protein in perihematoma tissue after intracerebral hemorrhage in rats and to investigate the injury mechanism after intracerebral hemorrhage. Methods A total of 54 male Wistar rats were randomly divided into sham operation and intracerebral hemorrhage groups, and the latter were redivided into 3,6, 12 hours, days 1,2,3, 5, and 7 subgroups （n = 6 in each group）. A model of intracerebral hemorrhage was induced by injecting 50 μL autologous tail artery blood into the caudate nucleus. Apoptosis was detected by TUNEL method. The expressions of Caspase-3 and PDCD5 was observed by immunohistochemistry. Results The apoptotic cells were found in perihematoma tissue of rats at 3 hours,they reached the peak at day 2 to day 3 and reduced gradually after 3 days. Caspose-3 and PDCD5 positive cells were found in perihematoma tissue of rats at 3 hours, they reached peak at day 1 to day 2 and reduced gradually after 3 days. The numbers of Caspase-3 （r =0. 971, P 〈0. 01 ） and PDCD5 （r = -0. 334, P 〈0. 01 ） positive cells were positively correlated with those of apoptotic cells in perihematoma tissue after intracerebral hemorrhage in rats. Conclusions The perihematoma tissue of intracerebral hemorrhage in rats existed apoptosis, and it was consistent with the expressions of Caspase-3 and PDCD5. Caspase-3 and PDCD5 may promote apoptosis in perihematoma tissue after intracerebral hemorrhage.