茶多酚对大鼠全脑缺血再灌注损伤的影响

目的 探讨茶多酚对大鼠全脑缺血再灌注损伤的影响.方法 健康清洁级雄性SD大鼠45只,体重180～220 g,采用随机数字表法,将大鼠随机分为3组(n=15):假手术组(S组)、脑缺血再灌注组(IR组)和茶多酚组(TP组).采用四血管阻塞法建立大鼠全脑缺血再灌注模型.IP组于再灌注即刻腹腔注射茶多酚200 mg/kg.再灌注后24h时,随机取5只大鼠,尾静脉注射伊文思蓝(EB)3ml/kg,处死后取脑组织,测定EB含量;随机取5只大鼠处死后,取脑组织,计算脑含水量;随机取5只大鼠进行Morris水迷宫实验.结果 与S组比较,IR组和TP组脑EB含量和脑含水量升高,IR组逃避潜伏期延长,穿越原平台区域的次数减少(P＜0.05);与IR组比较,TP组脑EB含量和脑含水量降低,逃避潜伏期缩短,穿越原平台区域的次数增多(P＜0.05).结论 茶多酚可减轻大鼠全脑缺血再灌注损伤.

Effect of tea polyphenols on global cerebral ischemia reperfusion injury in rats

Objective To investigate the effect of tea polyphenols on global cerebral ischemia reperfusion injury in rats.Method Forty-five pathogen-free male SD rats weighing 180-220 g were randomly divided into 3 groups( n =15 each):sham operation group (group S),cerebral ischemia reperfusion group (group IR) and tea polyphenols group (group TP).Global cerebral ischemia reperfusion injury was establish by four-vessel occlusion method.At 24 h of reperfusion,five rats were chosen and Evan's blue(EB) was injected iv,and then sacrificed and brain was removed for determination of EB content; another five rats were sacrificed and brain was removed for determination of water content; five rats were chosen for Morris water maze test.Result Compared with group S,EB content and water content in brain tissue were increased in groups IR and 'rP,and escape latency was prolonged,frequency of crossing the original platform was reduced in group IR ( P ＜ 0.05 ).Compared with group IR,EB content and water content in brain tissue were decreased,and escape latency was shortened,frequency of crossing the original platform was increased in group Tp ( P ＜ 0.05).Conclusion Tea polyphenols can attenuate global cerebral ischemia reperfusion injury in rats.