新生大鼠大脑皮质星形胶质细胞的体外培养

[目的]建立新生大鼠大脑皮质星形胶质细胞体外培养的方法.[方法]选用出生后24 h内的SD大鼠,分离大鼠大脑皮质细胞,加入含体积分数10%胎牛血清的高糖DMEM培养基培养,于倒置相差显微镜下观察细胞生长形态;取传代培养的第3代细胞,采用计数板计数法和四甲基偶氮唑盐(MTT)法检测细胞生长情况.[结果]从新生大鼠大脑皮质分离的细胞生长旺盛,星形胶质细胞形态典型,未见其他种类细胞生长.[结论]建立了一种简单易行的大鼠星形胶质细胞体外培养方法.     

Suppression of the multidrug transporter P-glycoprotein using RNA interference in cultured rat astrocytes induced by coriaria lactone

Abstract

The overexpression of the multidrug resistance gene (MDR-1) and its translational product p-glycoprotein (P-gp) may play an important role in pharmacoresistant epilepsy. We established the rat astrocyte model overexpressing P-gp induced by coriaria lactone and successfully nucleofected it with the siRNA-hairpin expression vector pSIREN-shuttle designed to target MDR-1B mRNA. The mRNA expression of MDR-1B gene was mostly knock down by 67.70% (p<0.01). The expression of P-gp in experimental group was significantly lower than that in negative control (p<0.05), and the rhodamine efflux ratio of experimental group (23.08%) was remarkably lower than that of negative control (78.35%, p<0.01). We first employed RNA interfering to the drug resistance reversal of refractory epilepsy and this may provide a new way for refractory epilepsy remedy.     

蛇床子素对Aβ_(25-35)诱导的星形胶质细胞NF-κB活化机制的影响

【目的】探讨蛇床子素（Osthole,Ost）拮抗β淀粉样蛋白25—35（Ap25-35）毒性损伤、保护神经细胞的作用及其与核因子-κB（NF—κB）活化机制的关系。【方法】以原代培养的大鼠星形胶质细胞（astrocytes,AS）为靶标建立阿尔茨海默病（Alzheimer＇s disease,AD）细胞模型。采用CCK-8（cell counting kit-8）法检测细胞活力,进行AB25-35造模浓度、时间以及Ost预处理最适宜浓度的选择。经Aβ25-35和Ost干预后,采用激光共聚焦显微镜检测分析异硫氰酸荧光素／碘化丙啶（FITC／PI）双重标记的NF—κB与其抑制蛋白（IKBot）在细胞内的激活程度,结合形态学观察分析Ost对星形胶质细胞的保护作用。【结果】Ost可拮抗Aβ25-35的神经毒性作用,尤其以低浓度（0．01-1μmol／L）为佳,随着浓度的升高,对细胞的保护作用呈减弱趋势。40μmol／L的Aβ25-35作用于As24h可过度活化NF—κB的表达（P〈0．01）,激活IκBα发生磷酸化及降解（P〈0．01）。低浓度的Ost可显著抑制NF—κB的过度活化（P〈0．01）,上调细胞核内IκBα的表达（P〈0．01）。【结论】Ost抑制Aβ25-35的神经毒性作用,延缓AD发生发展的作用机理可能与NF—κB活化机制有关。     

补阳还五汤和黄芪对脑缺血再灌注后星形胶质细胞的影响

[目的]为了探讨补阳还五汤和黄芪对脑缺血再灌注后星形胶质细胞（AS）的影响。[方法]采用沙土鼠双侧颈动脉夹闭脑缺血模型。于脑缺血15min再灌注24h和48h后运用免疫组织化学技术观察星型胶质纤维酸性蛋白（GFAP）的动态表达。[结果]缺血15min再灌注24h后，GFAP免疫阳性反应达高峰，补阳还五汤和黄芪可使GFAP免疫反应减轻；缺血15min再灌注48h后GFAP表达减弱，补阳还五汤和黄芪可使其增强。[结论]补阳还五汤和黄芪对脑缺血再灌注后星形胶质细胞的调节作用可能与脑缺血损伤后神经功能的恢复有关。