目的 观察绞股蓝总皂苷 (GP)对血管性痴呆 (VD)大鼠海马神经元型一氧化氮合酶 (n NOS)及核酸的保护作用。方法 采用改良的 Pulsinelli 4 -血管阻断 (4- VO)方法建立大鼠 VD模型 ,用免疫组化法研究 GP对大鼠海马 n NOS的表达的影响 ,并用吖啶橙染色法进行 GP对 VD大鼠海马的 DNA和 RNA保护作用的研究。结果与正常对照组比较 ,VD大鼠海马 CA1 区和 CA3区 n NOS阳性神经元数目明显减少 ,而 DNA和 RNA吖啶橙染色后的荧光强度 (反映 DNA和 RNA含量 )明显减弱 ,GP2 0 0 mg/ kg ig给药组海马各亚区的 n NOS阳性神经元神经细胞数比 VD模型组明显增多。DNA和 RNA吖啶橙染色后的荧光强度强于 VD模型组 ,与正常对照组相似。结论 GP可明显增强 VD大鼠海马 n NOS阳性神经元的表达 ,并对 DNA和 RNA有保护作用

Object To observe the protective effect of gypenosides (GP) on the neurons of hippocampus, cerebral cortex, corpus striatum, and dentate gyrus in cerebral ischemia-reperfusion injury of rats.Modified 4-vessel occlusion (4-VO) method was used to establish the model of acute global ischemia. The acridine orange (AO) staining method was used to observe the DNA and RNA contents of cerebral ischemia-reperfusion injury model in the areas.The fluorescent intensity (reflecting DNA and RNA contents) of the DNA and RNA in the areas of cerebral ischemia-reperfusion injury was markedly abated compared with the normal control group. In the group of ig GP (100 mg/kg) it was enhanced compared with the model group and was the same as the normal control group.The injury of the DNA and RNA in the areas of ischemia-reperfusion model was decreased by GP.