红景天苷对大鼠局灶性脑缺血/再灌注损伤的神经保护作用

摘要

目的：探讨红景天苷( salidroside,Sal)对大鼠局灶性脑缺血/再灌注损伤的神经保护作用及其机制。方法健康成年♂ SD大鼠36只,随机分为3组：假手术组( sham)、模型对照组( MCAO组)、红景天苷给药组( MCAO+Sal组)。通过线栓法制作大鼠局灶性脑缺血/再灌注损伤模型,Longa评分法对大鼠神经功能损伤评分,焦油紫染色法对神经细胞内尼氏(Nissl)小体染色,RT-qPCR技术检测大鼠缺血侧脑组织Neun、Nogo-A与NgR mRNA的表达, Western blot法检测大鼠缺血侧脑组织Bcl-2、Neun、BDNF、NGF、Nogo-A与NgR蛋白的表达。结果与MCAO组比较,红景天苷能明显降低神经功能损伤,增加 Nissl 阳性细胞的数量,促进 Bcl-2、Neun、NGF、BDNF 的蛋白表达,降低 Nogo-A 及其受体 NgR的mRNA及蛋白表达。结论红景天苷能够降低MCAO模型大鼠神经功能损伤,增加Nissl阳性细胞数目,提高Neun的表达,具有神经保护作用,此作用是通过促进抗凋亡因子Bcl-2及神经营养因子NGF、BDNF的蛋白表达,下调轴突生长抑制因子Nogo-A及其受体NgR的蛋白表达所实现。%Aim To investigate the effect of Salidroside on the focal celebral ischemia/reperfusion injury in rats and its underlying mechanism. Methods Adult male Sprague-Dawley rats, weighing 260-300 g, were ran-domly divided into three groups: sham, MCAO, MCAO+salidroside ( Sal ) groups. The rats were sub-jected to local celebral ischemia reperfusion with su- ture-occluded method. The rats of MCAO +Sal group were treated intraperitoneally with salidroside ( 50 mg ·kg-1 ) for 6 days. Neurological deficit testing was performed with Longa’ s Scale. The mRNA expressions of Neun,Nogo-A,and NgR were detected by RT-qPCR in ischemic brain. The protein expressions of Neun, NGF , BDNF , Nogo-A and NgR were determined by Western blot. Results Compared with MCAO group, salidroside significantly improved the neurological defi-cit,promoted the expressions of Bcl-2,Neun,NGF,BD-NF, and inhibited the expressions of Nogo-A, NgR. Conclusion Salidroside can reduce neurological defi-cit, increase the number of Nissl’ s Body and the ex-pression of Neun, and protect rats against focal cele- bral ischemia/reperfusion injury,which may be accom-plished by increasing the expressions of Bcl-2, NGF, BDNF, and inhibiting the expressions of Nogo-A, NgR.