丹酚酸B对脑缺血再灌注大鼠神经细胞损伤和神经发生的影响

本文旨在观察丹酚酸B对脑缺血再灌注大鼠神经发生和神经细胞损伤的影响，探讨丹酚酸B促进机体功能恢复的作用环节。研究采用大鼠局灶性脑缺血再灌注模型，治疗给药，用BrdU法观察海马齿状回颗粒下层(sub-granular zone，SGZ)和侧脑室下层(sub-ventricular zone，SVZ)神经发生的变化；尼氏体染色观察神经细胞损伤；平衡杆法观察肢体功能恢复。结果显示，缺血后再灌注7 d，模型组SGZ和SVZ的BrdU细胞明显多于假手术组(P<0.05)，丹酚酸B(10 mg·kg^-1)显著增加SGZ和SVZ的BrdU细胞数目(P<0.01 vs模型组)；缺血再灌注14 d，模型动物缺血侧海马CA1区和皮层神经细胞明显减少，丹酚酸B(10 mg·kg^-1)明显改善神经细胞损伤(P<0.01 vs模型组)；同时，丹酚酸B(10 mg·kg^-1)明显促进缺血动物肢体功能恢复。以上结果表明，丹酚酸B能够增加脑缺血大鼠SVZ和SGZ的BrdU细胞数目，改善缺血区神经细胞损伤，促进肢体功能恢复，提示促进神经发生是丹酚酸B改善脑功能的重要环节。

Effect of salvianolic acid B on neural cells damage and neurogenesis after brain ischemia-reperfusion in rats

This study is to observe the effect of salvianolic acid B (Sal B) on neural cells damage and neurogenesis in sub-granular zone (SGZ) and sub-ventricular zone (SVZ) after brain ischemia-reperfusion (I/R) in rats. A modified middle cerebral artery occlusion (MCAO) model of focal cerebral ischemia-reperfusion was used. The rats were divided into four groups: sham control group, ischemia-reperfusion group, Sal B 1 and 10 mg x kg(-1) groups. Sal B was consecutively administrated once a day by ip injection after MCAO. The neurogenesis in SGZ and SVZ was investigated by BrdU method 7 days after MCAO. The Nissl staining for neurons in the hippocampal CA1 and cerebral cortex was performed 14 days after MCAO. A beam-walking test was used to monitor the motor function recovery. We found that brain ischemia resulted in an increase of BrdU positive cells both in ipsilateral SGZ and SVZ at 7th day after MCAO. Sal B (10 mg x kg(-1)) significantly increased further the number of BrdU positive cells both in SGZ and SVZ (P < 0.01). Ipsilateral hippocampal neuron damage occurred and CA1 almost lost 14 days after MCAO. Sal B (10 mg x kg(-1)) obviously attenuated the neuron damage and increased the number of neuron both in ipsilateral CA1 and cerebral cortex (P < 0.01). We also observed an obvious improvement of motor function recovery when Sal B (10 mg x kg(-1)) administrated. From the results above we concluded that Sal B stimulated neurogenesis process both in SGZ and SVZ after brain ischemia, and also alleviated neural cells loss and improved motor function recovery after brain ischemia in rats.