二十二碳六烯酸乙酯对脑缺血再灌注氧化损伤及脑水肿的影响

目的 研究二十二碳六烯酸乙酯(ethyl docosahexaenoate，E-DHA)对沙土鼠脑缺血再灌注引起的氧化损伤和脑水肿的保护作用。方法 采用沙土鼠双侧颈总动脉阻断法制作全脑缺血再灌注损伤模型。检测E-DHA对缺血再灌注后脑中丙二醛(MDA)和谷胱甘肽(GSH)含量；谷胱甘肽过氧化物酶(GSH-Px)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)、ATP酶活性；水及Na^ 、Ca^2 含量的影响．并进行了病理检查。结果 缺血前E-DHA预防给药10周有效阻止了脑缺血再灌注引起的MDA升高，GsH降低，GsH-Px、CAT活性降低．ATP酶活性降低，水及Ca^2 、Na^ 含量升高。结论 E-DHA对沙土鼠脑缺血再灌注具有保护作用，其机理与清除自由基和减轻脑水肿有关。

Protective effects of ethyl docosahexaenoate on brain oxidative injury and edema induced by cerebral ischemic reperfusion

Objective To investigate the protective effects of ethyl docosahexaenoate on brain oxidative injury and edema induced by cerebral ischemic/reperfusion in gerbils. Methods The gerbils were subjected to both common carotid arteries occlusion. The contents of MDA and GSH, the activities of GSH-PX, CAT, SOD and ATPase, the water content and the concentrations of Na + and Ca 2+ were measured. Histopathological examination was also done. Results The pretreatment with E-DHA significantly prevented the raise of MDA level, the decline of GSH content, the activities of GSH-Px, CAT, ATPase and the increases of Ca 2+, Na + and water content. Conclusion E-DHA has protective effect on brain ischemic injury and edema, which may be due to an inhibitory action on hydroxyl radical formation and brain edema.