腺苷A_(2A)受体在小鼠大脑中动脉局灶缺血损伤中的作用及机制

目的 探讨阻断腺苷A2A受体对神经元缺血性损伤的影响及其可能机制.方法 将腺苷A2A受体基因敲除(A2ARKO)小鼠24只及同窝野生型(A2ARWT)小鼠24只分为A2ARKO组和A2ARWT组,每组下设脑缺血2 h(各6只)、脑缺血后再灌注22 h(各6只)和脑缺血后再灌注46 h(各12只)3个时相点,另外9只A2ARWT小鼠设为假手术组.线栓法制作大脑中动脉阻寒(middle cerebral artery occlusion,MCAO)模型,脑组织切片甲酚紫染色结合网象分析技术测定脑梗死体积,干湿质量法测定脑组织含水量,免疫组化染色榆测钙结合蛋白(Calbindin D-28k,CB)和水通道白4(aquaporin,AQP4).结果 在脑缺血2 h、脑缺血后再灌注22 h和脑缺血后再灌注46 h,测定A2ARKO组的腩梗死体积均小于A2ARWT组的梗死体积;与A2ARWT组比较,A2ARKO组脑内CB表达较多,AQP4表达较少,脑含水最较低.结论 阻断腺苷A2A受体对脑缺血急性期和再灌注期损伤均有保护作用,并减轻缺血引起的脑水肿,可能与抑制细胞内钙超载和AQP4的表达有关.

Role of adenosine A_(2A) receptor in ischemic brain injury induced by transient middle cerebral artery occlusion in mice

Objective To investigate the effect of adenosine A2A receptor deficiency on the ischemic neuronal injury and its potential mechanism.Methods Transient(2 h)cerebral ischemia was induced by the middle cerebral artery occlusion(MCAO)in mice.Adenosine A2A receptor knockout(A2ARKO)mice and their wild-type littermates(A2ARWT)were divided into 2-hour cerebral ischemia group,cerebral ischemia with 22-hour reperfusion group and cerebral ischemia with 46-hour reperfusion group.Cerebral infarction volume was measured ...