摘要
目的 评价钙蛋白酶在七氟醚麻醉诱发老龄大鼠海马神经元凋亡中的作用.方法 健康雌性SD大鼠54只,18月龄,体重450~ 550 g,采用随机数字表法,将其分为3组(n=18):对照组(C组)、七氟醚组(Sev组)和钙蛋白酶抑制剂MDL28170组(M组).C组吸入50%O2-50%N2混合气体3 h;Sev组吸入3%七氟醚3 h;M组尾静脉注射MDL28170 10 mg/kg,30 min后吸入3%七氟醚3h,同时尾静脉输注MDL28170 3.33 mg·kg-1·h-1.每组取9只大鼠,分别于麻醉前30 min和麻醉后1~5d时采用Morris水迷宫实验评价认知功能,记录逃避潜伏期和穿越原平台次数;分别于麻醉前30 min和麻醉后1、5d水迷宫测试结束后,每组处死3只大鼠,取海马组织,采用流式细胞术测定神经元凋亡率和胞浆钙离子浓度.结果 与C组比较,Sev组和M组麻醉后1d时逃避潜伏期延长,穿越原平台次数减少,神经元凋亡率和胞浆钙离子浓度升高(P<0.05);与Sev组比较,M组麻醉后1d时逃避潜伏期缩短,穿越原平台次数增多,神经元凋亡率降低(P<0.05),胞浆钙离子浓度差异无统计学意义(P>0.05).结论 钙蛋白酶激活参与了七氟醚麻醉诱发老龄大鼠海马神经元凋亡.
Objective To evaluate the role of calpain in sevoflurane anesthesia-induced apoptosis in hippocampal neurons of aged rats.Methods Fifty-four healthy female Sprague-Dawley rats,aged 18 months,weighing 450-550 g,were randomly divided into 3 groups (n=12 each) using a random number table:control group (group C),sevoflurane group (Sev group) and calpain inhibitor M DL28170 group (group M).In group C,the rats inhaled 50% O2-50%N2 for 3 h.In Sev group,the rats inhaled 3% sevoflurane for 3 h.In group M,MDL28170 10 mg/kg was injected via the tail vein,30 min later 3% sevoflurane was inhaled for 3 h,and MDL28170 was simultaneously infused at 3.33 mg · kg 1 · h-1 via the tail vein.Nine rats in each group were selected,and cognitive function was assessed by using Morris water maze test at 30 min before anesthesia and 1-5 days after anesthesia.The escape latency and frequency of crossing the original platform were recorded.After the end of Morris water maze test performed at 30 min before anesthesia and 1-5 days after anesthesia,3 rats in each group were sacrificed,and hippocampal tissues were obtained for detection of cell apoptosis (by flow cytometry) and intracellular [Ca2+] i.Apoptotic rate was calculated.Results Compared with group C,the escape latency was significantly prolonged,and the frequency of crossing the original platform was decreased,and the apoptotic rate and intracellular [Ca2+]i were increased at 1 day after anesthesia in Sev and M groups.Compared with group Sev,the escape latency was significantly shortened,the frequency of crossing the original platform was increased,and the apoptotic rate was decreased at 1 day after anesthesia,and no significant change was found in intracellular [Ca2+]i in group M.Conclusion Calpain activation is involved in sevoflurane anesthesia-induced apoptosis in hippocampal neurons of aged rats.
出处
《中华麻醉学杂志》
CAS
CSCD
北大核心
2015年第4期423-425,共3页
Chinese Journal of Anesthesiology
基金
河北省2012年度医学适用技术跟踪项目(GL2012046)
河北省科技支撑项目(14277750D)