芦丁对三甲基锡损害学习记忆功能的保护作用与拮抗突触囊泡蛋白表达下调有关

摘要

目的：探讨芦丁对三甲基锡（Trimethyltin, TMT）损害小鼠学习记忆功能的保护作用及可能机制。方法以6~9周龄雄性BALB/c小鼠为研究对象，随机分为生理盐水组（对照）、TMT组、TMT+芦丁组、芦丁组，每组各10只；建立TMT（2.25 mg/kg· B. W.）急性暴露模型，后两组芦丁（10 mg/kg· B.W.）预处理1周，均腹腔注射；TMT给药后24 h，Morris水迷宫测试各组的逃逸潜伏期，Western检测各组海马和皮层脑区突触囊泡蛋白（Synaptophysin, SYP）的表达情况。结果 Morris水迷宫显示TMT给药后24 h，与TMT组相比，对照组和芦丁组及TMT+芦丁组逃逸潜伏期显著缩短（P<0.05），与芦丁组及对照组相比，TMT+芦丁组逃逸潜伏期无统计学意义（P>0.05）；Western显示TMT给药后24 h，与对照组相比，TMT组海马和皮层脑区SYP蛋白表达显著降低（P<0.05）；与TMT组相比，TMT+芦丁组海马和皮层脑区SYP蛋白表达显著升高（P<0.05），与芦丁组及对照组相比，TMT+芦丁组海马和皮层脑区SYP蛋白表达无统计学意义（P>0.05）。结论芦丁预处理对TMT急性暴露损害小鼠学习记忆功能有保护作用，其保护作用可能与拮抗海马和皮层脑区SYP表达下调有关。%Objective To explore the protective effects of rutin against learning and memory impairment induced by trimethyltin (TMT) and investigate the possible mechanism. Methods Forty 6- to 9-week-old male BALB/c mice were randomized equally into saline group (control), TMT group, TMT+rutin group, and rutin group. Mouse models of learning and memory impairment were establish by acute TMT (2.25 mg/kg) exposure. In TMT+rutin and rutin treatment groups, the mice received intraperitioneal injection of rutin (10 mg/kg) for 1 week before TMT exposure. Twenty-four hours after TMT exposure, Morris water maze test was employed to test the escape latency of the mice, and the synaptophysin expression in the hippocampus and cortex were analyzed by Western blotting. Results Compared that in TMT group, the escape latency of the mice in water maze test was significantly shorter in the other 3 groups (P<0.05);the escape latency in TMT+rutin group was similar with that in the control and rutin groups (P>0.05). Western blotting showed significantly decreased synaptophysin expression in the hippocampus and cortex in TMT group (P<0.05); synaptophysin expression in TMT+rutin group increased significantly compared with that in TMT group (P<0.05) but showed no statistical significance from that in rutin and control groups (P>0.05). Conclusion Rutin pretreatment offers protective effect against TMT- induced learning and memory impairment in mice possibly by antagonizing decreased synaptophysin in the hippocampus and cortex.