松果菊苷对脑缺血大鼠海马、纹状体胆碱、乙酰胆碱水平的影响

Effects of echinacoside on extracellular acetylcholine and choline levels of hippocampus and striatum of cerebral ischemia rats

松果菊苷（echinacoside，ECH）是从新疆特色植物、国家重点保护野生药材肉苁蓉中分离、纯化的苯乙醇苷类化合物的主要成分，研究表明，ECH具有明显的神经保护作用，主要表现在抗氧化作用、抗神经元凋亡作用、改善学习记忆能力和抗衰老作用等。血管性痴呆（vascular dementia，VD）是以记忆、认知功能缺损为主。伴有语言、运动、视空间障碍等脑血管病变损害导致的痴呆，

The aim of this study is to investigate the effect of echinacoside （ECH） on cholinergic neurotransmitter extracellular of hippocampus and striatum and its possible mechanisms of neuro-protective effect against vascular dementia rats. In this study brain microdialysis technique combined with HPLC-IMER- ECD （high-performance liquid chromatography-immobilized enzyme reactor-electrochemical detector） was used. The bilateral common carotid arteries occluded in two times operation at 72 h interval for vascular dementia model rats were used and the successful vascular dementia model rats were examined by Morris water maze. The content of acetylcholine （ACh） and choline （Ch） of microdialysate extracellular of hippocampus and striatum was determined by HPLC-IMER-ECD and the AChE activity in the hippocampus was measured. The results showed that the success rate of vascular dementia model was 83.08% after six weeks; the results also showed that echinacoside and galantamine could increase the content of ACh and reduce the content of Ch extracellular of hippocampus and striatum significantly and the AChE activity increased significantly compared with that of the model group. The results suggested that echinacoside could promote the recovery of cholinergic neurotransmitter levels in vascular dementia rats＇ brain, which may be one of the mechanisms of neuro-protection.