摘要目的 探讨异氟醚麻醉对新生大鼠海马激活肌细胞增强因子2(MEF2)信号通路的影响.方法 取出生5 d的SD大鼠24只,雌雄不拘,体重10～13 g,采用随机数字表法,将大鼠随机分为2组(n=12):对照组(C组)和异氟醚组(I组).I组大鼠放置在密闭箱中,吸人1.5%异氟醚和纯氧,吸入时间6 h,C组不做任何处理.于异氟醚麻醉2、4、6 h和麻醉结束后24 h(T1-4)时(C组于相应时点)分别取3只大鼠,断头处死,取海马组织,采用RT-PCR法测定MEF2mRNA、synGAPⅠ mRNA和Arc mRNA及突触素Ⅰ mRNA的表达水平,采用Westrn blot法测定突触素Ⅰ蛋白的表达水平.结果 与C组比较,I组T1-3时海马MEF2mRNA、synGAP Ⅰ mRNA、Arc mRNA和突触素Ⅰ mRNA、T2-4时海马突触素Ⅰ蛋白表达水平均上调(P＜0.05).结论 吸入麻醉浓度的异氟醚可能通过激活新生大鼠海马MEF2信号通路从而影响发育期突触的形成.

abstractsObjective To investigate the effects of isoflurane anenthesia on myocyte enhancer factor 2(MEF2) signaling pathway in neonatal rat hippocampus. Methods Twenty-four 5-day-old SD rats of both sexes,weighing 10-13 g, were randomly divided into 2 groups ( n = 12 each): control group (group C) and isoflurane group (group I). In group I, 1.5% isoflurane in 100% O2 was inhaled for 6 h. Group C received no treatment.Three rata in each group were sacrificed at 2, 4, 6 h of isoflurane anenthesia and 24 h after isoflurane anenthesia (T1-4), and the hippocampi removed for determination of MEF2 mRNA, synGAP Ⅰ mRNA, Arc mRNA and synapsinⅠ mRNA expression (by PT-PCR) and synapsin Ⅰ protein expression (by Western blot).Results Compared with group C, the expression of MEF2 mRNA, synGAP Ⅰ mRNA, Arc mRNA and synapsin Ⅰ mRNA at T1-3 and synapsin Ⅰ protein at T2-4 was up-regulated in group I ( P ＜ 0.05). Conclusion Inhalation of anaesthetic concentration of isoflurane may affect synapse formation during the development of central nervous system by actirating hippocampal MEF2 signaling pathways in neonatal rats.