阿米替林对局灶性脑缺血/再灌注损伤脑内单胺类神经递质的影响

目的研究阿米替林对大鼠局灶性脑缺血/再灌注损伤的作用。方法用线栓法建立大鼠局灶性脑缺血/再灌注损伤模型,用TTC染色和图像分析系统测梗死体积;神经功能缺损采用0～5级评分;荧光分光光度法测定大脑皮层和纹状体多巴胺(DA)、去甲肾上腺素(NE)、5-羟色胺(5-HT)及5-羟吲哚乙酸(5-HIAA)。观察阿米替林对大鼠局灶性脑缺血1h/再灌注2h时脑梗死体积、神经功能及大脑皮层和纹状体单胺类神经递质的影响。结果缺血1h/再灌注2h时,阿米替林可使脑梗死体积变小、神经功能缺损评分分值明显降低、单胺递质含量明显提高,与模型组相比差异有显著性。结论阿米替林对大鼠局灶性脑缺血/再灌注引起的神经损伤有保护作用。其机制可能与其减少缺血/再灌注期间单胺类神经递质的释放有关。

Effects of amitriptyline on monoamines of brain tissue in rats with focal cerebral ischemia-reperfusion injury

Aim To study the effects of amitriptyline(Ami)on focal cerebral ischemia-reperfusion injury in rats.Methods An animal model of focal cerebral ischemia-reperfusion injury was induced by the middle cerebral artery occlusion(MCAO) by reversibly inserting a nylon thread method.The rats were decapitated after ischemia for 1 hour and reperfusion for 2 hours.The infarct volumes were determined using a 2,3,5-tri-phenyl tetrazolium chloride(TTC) staining and assessed by image analysis system.The neurologic deficit status were evaluated on 0~5 grade scale.The levels of dopamine(DA),norepinephrine(NE),serotonin(5-HT) and its metabolic product~hydroxyindole acetic acid(5-HIAA) in cortex and striatum were measured by fluoro-spectrophotometry.Results Ami treatment exhibited a remarkable reduction in infarct volume and neurologic deficit scores.The monoamines content of cortex and striatum had a significant increase compared with ischemia-reperfusion group.Conclusion Amitriptyline has protective effect on cerebral ischemia-reperfusion injury in rats.The mechanism might be related to reducing the release of NE,DA and 5-HT during cerebral ischemia-reperfusion,attenuating or inhibiting of the neurotoxic effects of monoamine neurotransmitters.