尼莫地平对大鼠脑出血周边组织AQP4表达的影响

目的 观察尼莫地平对ICH周边组织AQP4表达、细胞内Ca2+浓度变化及对BBB保护作用的影响.方法 参考Rosenberg等方法复制大鼠ICH动物模型,随机将120只Wistar大鼠分为假手术组(n=20)、脑出血组(n=50)和尼莫地平治疗组(n=50),脑出血后分别观察6h、1d、3d、5d、7d等5个时间点.用免疫组化法测定ICH周边组织AQP4的表达,用荧光标记检测胞内Ca2+及EB作为示踪剂监测BBB的损伤程度,用干湿法测定脑组织含水量.结果 (1)脑出血组3d含水量达到高峰,第7天明显下降,但仍高于正常水平;尼莫地平组3d含水量达高峰,但低于脑出血组;(2)脑出血后6h血肿周边组织EB含量增加,1d达高峰,7d已明显下降;尼莫地平干预后各时间点EB含量明显低于脑出血组,高于假手术组,7d后EB含量恢复正常;(3)脑出血后6h血肿周边组织AQP4表达及细胞内Ca2+浓度逐渐增高,3d达高峰,7d后下降明显;尼莫地平组血肿周边组织AQP4表达及细胞内Ca2+浓度逐渐增高,3d达高峰,明显低于脑出血组.结论 (1)Ca2+能促进AQP4的过度表达,使BBB通透性增加,参与出血性脑水肿的病理过程;(2)尼莫地平可阻断Ca2+向细胞内过度内流,进而降低AQP4的表达,减轻脑水肿程度,为脑出血治疗提供新的靶点.

Effects of nimodipine on the expression of AQP4 around the edema after intracerebral hemorrhage in rats

Objective To study the influence of nimodipine in the dynamic expression of Aquaporin-4 and the concentration of free intracellular calcium,blood-brain barrier and brain water content around intracerebral hemorrhage(ICH) in rats.Methods A rats model of ICH was made according to the methods of Rosenberg,160 wistar rats were randomly separated into sham group(n=20),ICH group(n=50),nimodipine group(n=50),and observed the expression of AQP4 and the concentration of free intracellular calcium by the time of 6h,1...