| 摘 要： | ![]()
目的 探讨雌激素对缺氧/复氧诱导新生大鼠皮质神经元损伤的保护作用及其机制.方法 将培养7 d的大鼠皮质神经元随机分为三组,A组为正常对照组,B组采用缺氧/复氧(H/R),C组采用雌激素(17βE2)预处理加H/R处理,各组在H/R后0、1、3、6、12、24 h各时间点,以TUNEL法比较各组凋亡细胞,免疫组化方法比较各组高迁移率族蛋白B1(HMGB1)、核因子-κB(NF-κB)表达.结果 ①B组凋亡神经元明显多于正常对照组(H/R后3～24 h),C组凋亡细胞数目显著少于B组,三组比较差异有统计学意义.②B组HMGB1、NF-κB的表达较正常对照组明显增加,C组HMGB1、NF-κB表达较B组明显减少.结论 雌激素可使H/R后神经元HMGB1、NF-κB表达降低,抑制神经元凋亡,提高其存活率,这可能是其脑保护作用的机制之一.Abstract：Objective To explore the protective effects of estrogen on injured neurons induced by H/R and the mechanisms of that. Methods The cortical neurons cultured for 7 days were randomly divided into group A (normal control group), group B (H/R alone), group C (pretreatment with Estrogen -17βE2 and H/R). Then the apoptotic neurons were count by TUNEL, and the expression of HMGB1,NF- κB was observed by immunocytochemical technique, on each time point after reoxygenation 0,1,3,6,12,24 h of each group. Results ①The number of apoptotic neurons in group B was more than that in control group after H/R 3-24 h, and was less in group C than in group B. ②Compared with group A, the expression of HMGB1 and NF-κB was higher in group B,and was lower in group C than in group B. Conclusions Estrogen could decrease the expression of HMGB1 and NF-κB to inhibit neuronal apoptosis after H/R, which may be one of the mechanisms in which estrogen exerts its neuro-protective effect.
|
