G-CSF干预对老龄慢性脑缺血大鼠模型认知改善与胶质细胞可塑性的影响

目的 探讨粒细胞集落刺激因子(G-CSF)干预后,慢性脑缺血老龄鼠学习记忆功能改善与海马胶质细胞可塑性改变的相关性.方法 12月龄雄性SD大鼠2VO术后饲养3个月,构建15月龄的2VO慢性脑缺血老龄鼠模型.分为2VO/G-CSF组(n=10)、2VO/NS组(n=7),Sham组(n=10).采用Morris水迷宫检测大鼠空间学习记忆能力,通过免疫组化和图像分析技术检测海马CA1区胶质细胞的数目及胞质突起长度.结果 水迷宫实验:2VO/NS组逃逸时间显著长于Sham组和2VO/G-CSF组(P＜0.01);2VO/NS组大鼠在平台象限的停留时间少于Sham组(P＜0.01)和2VO/G-CSF组(P＜0.05);2VO/NS组大鼠跨过平台区域的次数少于Sham组和2VO/G-CSF组(P＜0.01).HE染色发现G-CSF干预后海马CA1区锥体细胞排列层数增加,胞体增大.免疫组化染色:2VO/NS组海马CA1区GFAP阳性细胞少于Sham组和2VO/G-CSF组(P＜0.05).2VO/NS组大鼠GFAP阳性细胞胞质突起长度低于Sham组和2VO/G-CSF组(P＜0.05).认知功能与胶质细胞可塑性的相关分析:2VO/NS组、Sham组及2VO/G-CSF组海马CA1区胶质细胞的数量、胞质突起长度与空间记忆能力均呈正相关(P＜0.05).结论 慢性脑缺血可致老龄鼠的空间学习记忆能力明显受损,G-CSF可诱导海马锥体细胞增生及胶质细胞可塑性改变,有效改善空间学习记忆功能.其中,胶质细胞可塑性改变与空间记忆功能改善密切相关.

The correlation of cognitive handicap and gliacyte plasticity after G-CSF treatment in chronic cerebral hypoperfusion of the aged rats

Objective To investigate correlation of granulocyte colony stimulating factor(G-CSF) on cognitive handicap and gliacyte plasticity in chronic cerebral ischemia aged rats.Methods 12 months male SD rats were regularly fed for 3 months after bilateral common carotid arteries occlusion surgery(2VO) to set up 15 month-old chronic cerebral ischemia aged rats.The male SD rats were randomly divided into 2VO/NS(n=7),Sham(n=10) and 2VO/G-CSF(n=10) groups.Spatial learning and memory were accessed by Morris water maze,...