摘要:
目的:观察颞叶癫痫大鼠海马组织中let-7e和miR-23在癫痫持续状态( SE)后不同时间点的表达变化。方法160只大鼠,随机分为生理盐水对照组10只、癫痫模型组150只,癫痫模型组制备氯化锂-匹罗卡品诱导的颞叶癫痫大鼠模型,并将SE后不同时间点(0 h、1 h、6 h、12 h、1天、2天、7天、10天、30天、50天)分为10个组,每组15只。采用荧光实时定量PCR检测各组大鼠海马组织let-7e和miR-23。结果癫痫模型组SE后0 h、1 h、6 h、12 h、1天、2天、7天、10天、30天、50天let-7e相对表达量分别为0.61、0.84、0.85、1.40、10.74、0.71、0.65、1.52、1.69、0.13,miR-23相对表达量分别为0.27、0.31、0.41、0.39、4.49、0.21、0.18、0.12、0.83、2.40,与生理盐水对照组比较,P均<0.05。结论颞叶癫痫大鼠SE后海马组织中let-7e和miR-23均先出现表达水平上调,24 h达到峰值后表达水平下调,let-7e在10~30天表达水平再次升高,miR-23在30~50天表达水平再次升高。%Objective To detect the expression changes of let-7e and miR-23 in the hippocampus tissues of rats with temporal lobe epilepsy ( TLE) at different time points after status epilepticus ( SE) .Methods A total of 160 rats were randomly divided into the control group ( n=10 ) which was injected with normal saline , and the TLE group ( n=150 ) which was induced by lithium-pilocarpine.TLE group was divided into 10 subgroups by different time points (0 hour, 1 hour, 6 hours, 12 hours, 1 day, 2 days, 7 days, 14 days, 30 days and 50 days) after SE and each subgroup was consist of 15 rats.The real-time fluorescent quantitative PCR was performed to detect the expression changes of let -7e and miR-23 in all rats.Results The relative expression levels of let-7e in the TLE subgroups were 0.61, 0.84, 0.85, 1.40, 10.74, 0.71, 0.65, 1.52, 1.69 and 0.13 at 0 h, 1 h, 6 h, 12 h, 1 d, 2 d, 7 d, 14 d, 30 d and 50 d.When we compared with that of the normal saline group, significant differences were found (all P<0.05).The relative expression levels of miR-23 in the TLE subgroups were 0.27, 0.31, 0.41, 0.39, 4.49, 0.21, 0.18, 0.12, 0.83 and 2.4 at 0 h, 1 h, 6 h, 12 h, 1 d, 2 d, 7 d, 14 d, 30 d and 50 d.When we compared with that of the normal saline group , significant differences were found (all P<0.05).Conclusions The expression of let-7e and miR-23 in the hippocampus of TLE rats was first up-reg-ulated and reached the peak value at 24 h after SE and then it began to down-regulate.A second up-regulated expression was seen from 10 d to 30 d after SE with let-7e and from 30 d to 50 d with miR-23.