促红细胞生成素对大鼠脑出血神经的保护作用

目的 研究促红细胞生成素(EPO)对脑出血神经保护作用的机制.方法 用立体定向技术,将自体小凝血注入大鼠尾状核区制备脑出血模型.110只Wistar雄性大鼠,随机分成四组:正常组、假手术组、ICH对照组、rhEPO治疗组.应用免疫组化及原位细胞凋亡检测脑出血灶周组织Bcl-2、Bax表达及凋亡细胞.统计学方法采用LSD-t检验及Pearson相关分析.结果 ICH对照组及rhEPO治疗组术后6 h血肿周围皮质TUNEL,Bcl-2,Bax阳性细胞明显增加,72 h达到高峰,120 h下降,各时间点与假手术组比较,差异具有统计学意义(P<0.01).rhEPO治疗组TUNEL、Bax阳性细胞数明显少于同时点ICH对照组(P<0.01),但Bcl-2阳性细胞数明显增加(P<0.01).Bax蛋白表达及Bax/Bcl-2均与细胞凋亡呈正相关(P<0.01).结论 凋亡机制参与脑出血后继发性损伤过程,EPO通过上调Bcl-2蛋白表达,下调Bax蛋白表达,对脑出血后神经损伤起保护作用.

Neuroprotective effect of erythropoietin on intracerebral hemorrhage

Objective To study the neuroprotective effects of erythropoietin on intracerebral hemorrhage (ICH). Method The rat models of 1CH were produced by injecting autologous blood into caudate necleus by using stereotatic techique. One hundred ten male wistar rats were randomly divided into 4 groups, namely normal group,sham operation group, 1CU group, and EPO treatment group. The immunohistochemistry and TUNEL were used to detect expressions of Bc 1-2 and Bax,and apoptosis cells. LSD- t and Pearson correlation were used to analyzing data. Results The positive cells of TUNEL Bcl-2 and Bax in ICH group and EPO group obviously increased over 6 hours,and reached peak 72 hours later,and decreased over 120 hours,and the positive cells in different intervals significantly decreased in ICH group and EPO group compared with those in sham operation group (P < 0.01). The positive cells of TUNEL and Bax in EPO group in different intervals significantly decreased compared with those in ICH group (P < 0.01). The Bcl-2 positive cells in EPO group in different intervals significantly increased compared with those in ICH group (P < 0.01). The Bax protein expression, Bax/Bcl-2 and apoptosis presented positive correlation (P < 0.01). Conclusions Apoptosis may induce some brain injury after ICH,and EPO can decrease the number of apoptotic cells after ICH by up-regulating Bcl-2 and down-regulating Bax.