大鼠急性一氧化碳中毒迟发性脑病模型中干预剂叔丁基对苯二酚对Nrf2及HO-1表达的影响

摘要

目的:初步探讨大鼠急性一氧化碳中毒迟发性脑病(DEACMP)模型中干预剂叔丁基对苯二酚(tBHQ)前后脑组织海马区核因子E2相关因子2(Nrf2)及其下游靶基因血红素加氧酶1(HO-1)的变化,从而进一步研究DEACMP的发病机制,同时为其靶向治疗的研究提供一定的实验基础.方法:将240只大鼠按随机数字表法分为一氧化碳中毒组(CO组)、空气对照组(AC组)、一氧化碳+3%乙醇组(EC组)、一氧化碳+tBHQ组(TC组),再将各组大鼠按染毒后1、3、7、14、21、28 d随机分为6个亚组,随后用Morris水迷宫试验观察大鼠行为学表现,免疫组织化学及蛋白免疫印迹法(Western blot)检测大鼠干预剂tBHQ前后Nrf2及HO-1的表达变化,TUNEL染色检测细胞凋亡情况.结果:CO组、EC组、TC组大鼠海马区Nrf2及HO-1表达均表现为染毒后第1天升高,3 d达高峰,随后逐渐下降的趋势,各时间点与AC组比较差异均有统计学意义,TC组与CO组比较Nrf2及HO-1表达增高,各亚组比较差异均有统计学意义.CO组、EC组、TC组大鼠与AC组比较凋亡细胞随时间明显增多,且均表现为增高-高峰(7~14 d)-降低的趋势,TC组与CO组比较凋亡细胞(7~14 d)减少,差异有统计学意义.结论:DEACMP的发生发展中Nrf2/ARE/HO-1通路起着重要作用,tBHQ特异性激活Nrf2通路达到早期保护作用,有望减少或减轻DEACMP.%Objective:Preliminary study on rats with delayed encephalopathy after acute carbon monoxide poisoning (DEACMP) model intervention agent tBHQ before and after the nuclear factor E2-related factor 2(Nrf2) and its downstream target genes of heme oxygenase 1(HO-1) change in hippocampus associated,in order to further study the pathogenesis of DEACMP,at the same time for the targeted therapy of provide a certain experimental basis.Methods: One hundred and twenty rats were randomly divided into carbon monoxide poisoning group(CO group),air control group(AC group),carbon monoxide+3% ethanol group(EC group),carbon monoxide+tBHQ group(group TC),then the rats in exposure after 1 d,3 d,7 d,14 d,21 d,28 d,with the machine was divided into 6 sub groups,followed by the Morris water maze test to observe the behavior of rats,immunohistochemistry and protein Western blot method of chemical(Western blot) detecting expression of Nrf2 and HO-1 mploying intervention agent tBHQ before and after,and then TUNEL staining was detected cell apoptosis.Results: CO group,EC group,TC group Nrf2 in hippocampus of rats and the expression of HO-1 were increased in the first day and reach a peak at the third day,then gradually decreased,and at each time point in AC group were statistically significant,TC group and CO group Nrf2 and HO-1 were increased in each sub group and the deffirences were statistically meaning.Comparison apoptotic cells in CO group,EC group,TC group with AC group rats increased significantly over time,and showed higher peak(7-14 d)-decreased.TC group compared with CO group,the apoptotic cells(7-14 d) decreased,the difference was statistically significant.Conclusion: The Nrf2/ARE/HO-1 pathway plays an important role in the development of DEACMP,and the tBHQ specific activation of the Nrf2 pathway achieves early protection and is expected to reduce or mitigate DEACMP.