黄芪注射液对脑出血大鼠细胞凋亡影响的研究

目的 研究脑出血大鼠细胞凋亡的规律及黄芪注射液对出血后脑组织含水量和血肿周围区细胞凋亡的影响.方法 采用肝素化Ⅶ型胶原酶脑内注入法制作大鼠(160只)脑出血模型.制模后根据药物干预的时间随机分成4个治疗组(手术同时组,术后6 h组、12 h组、24 h组,每组32只)和出血对照组(共32只).各治疗组每日经腹腔给予黄芪注射液1次,各组分别于第4 d及第7 d处死.再从上述5组中各选取12只大鼠用于脑组织含水量测定(干湿法),观察不同时间开始治疗对大鼠脑组织含水量、血肿周围区细胞凋亡(脑组织切片TUNEL荧光染色)的影响.结果 治疗组出血同时组(第4 d)、6 h组(第4 d、7 d)、12 h组(第4 d)]脑组织含水量较出血对照组明显减少(均P<0.01);脑出血后6 h血肿周围凋亡细胞开始出现,3 d达高峰,7 d后明显减少;各治疗组血肿周围细胞凋亡均明显降低,出血同时治疗组和6 h治疗组比24 h治疗组细胞凋亡率明显降低(均P<0.01);脑出血后存在血管内皮细胞凋亡.结论 脑出血后血肿周围神经细胞凋亡是脑出血后继发性神经损伤机制之一;黄芪注射液治疗脑出血,具有减轻脑水肿和神经细胞凋亡作用,以早期用药疗效更好.

Study of the effect of Astragalus injection on the cell apoptosis of intracerebral hemorrhage in rats

Objective To investigate the rule of cell apoptosis after intracerebral hemorrhage (ICH) in rats, and to analyze the effect of Astragalus injection on the brain tissue water content and cell apoptosis perihematoma.Methods Experimental ICH models of rats were produced in by injection of Collagenase into right caudate nucleus using stereotaxis technique. After operation, 160 SD rats were randomly divided into 4 test groups according to different intervention time (operation meanwhile group, 6 h group,12 h group and 24 h group after operation, 32 rats in each group) and hemorrhagic control group (32 rats). The rats in test groups were treated with Astragalus injection intraperitoneally once a day. All ICH animals were killed at 4 d or 7 d after ICH. 12 rats from the above each group were used to measure brain tissue water content (dry-wet method). The effect of different initiation time point of treatment on brain tissue water content and cell apoptosis perihematoma was observed. The apoptosis perihematoma was detected by TUNEL technique.Results Compared with hemorrhagic control group, brain tissue water contents improved significantly in operation meanwhile group (4 d), 6 h group (both 4 d and 7 d) and 12 h group (4 d)(all P<0.01). The cell apoptosis perihematoma after ICH operation appeared at 6 h, peaked at 3 d, and decreased gradually since 7 d. The TUNEL-positive cells in the all test groups obviously decreased. The apoptosis rate in operation meanwhile group and 6 h group was significantly lower than in 24 h group (P<0.01).Cell apoptosis was also found in vascular endothelial cells after ICH.Conclusions Cell apoptosis is presented in the border zone of ICH and it is one of the factors that cause secondary brain injury following intracerebra1 hemorrhage. Astragalus injection can be used to treat ICH for anti-apoptosis and should be used as early as possible.