硫化氢对大鼠海马神经元缺氧复氧损伤后的作用及其机制
发布时间:2018-03-21 21:49
本文选题:硫化氢 切入点:氧糖缺失/恢复 出处:《华中科技大学》2013年硕士论文 论文类型:学位论文
【摘要】:目的研究外源性硫化氢(hydrogensulfide,H_2S)对大鼠海马神经元氧糖缺失/恢复(oxygen-glucosedeprivationandrecovery,OGD/R)损伤后的作用,并探讨海马神经元OGD/R损伤后缺氧诱导因子-1α(hypoxia-induciblefactor-1α,HIF-la)的变化及H_2S的干预作用。 方法孕16-18d胎鼠海马神经元原代培养,培养7d后神经元特异性烯醇化酶(neuron-specificenolase,NSE)免疫组化法作神经元鉴定,培养第8天时OGD1h/R24h造成缺氧/复氧损伤,缺氧同时给予硫氢化钠(sodiumhydrosulfide,NaHS)干预。将大鼠海马神经元随机分为3组:正常培养组(Ⅰ组)、OGD/R组(Ⅱ组)、OGD/R+NaHS组(Ⅲ组),Ⅲ组又根据NaHS浓度分为Ⅲ1-5亚组;NaHS浓度分别为25、50、100、200、400μmol/L。MTT法测定各组细胞活力,比色法检测各组培养液中乳酸脱氢酶(lactatedehydrogenase,LDH)活性,流式法检测各组细胞凋亡,RT-PCR法检测各组细胞Caspase-3mRNA,HIF-1mRNA表达。 结果(1)与正常组相比较,模型组细胞活力明显降低,培养液中LDH漏出增多,凋亡加重,Caspase-3mRNA、HIF-1αmRNA表达增高(P<0.01);(2)与模型组相比较,Ⅲ1组细胞活力、培养液中LDH漏出、凋亡、Caspase-3mRNA、HIF-1αmRNA表达的差异无统计学意义(P>0.05);(3)与模型组相比较,Ⅲ2-4组细胞活力明显增高,培养液中LDH漏出减轻,凋亡减轻,Caspase-3mRNA表达降低,HIF-1αmRNA表达明显增高(P<0.01);(4)与模型组相比较,Ⅲ5组细胞活力明显降低,,培养液中LDH漏出增多,凋亡加重,Caspase-3mRNA表达增高,HIF-1αmRNA表达明显降低(P<0.01)。 结论低浓度H_2S(25μmol/L)对海马神经元OGD/R损伤无明显影响,中浓度H_2S(50-200μmol/L)可以减轻海马神经元OGD/R损伤,增加细胞活力,减轻细胞凋亡,但高浓度H_2S(400μmol/L)则可加重其损伤;海马神经元OGD/R损伤后HIF-1αmRNA表达增强,适当浓度H_2S(50-200μmol/L)可能通过上调HIF-lα的表达发挥保护作用。
[Abstract]:Objective to study the effect of exogenous hydrogen sulfide (H2S) on oxygen-glucose privacy and recovery of oxygen-glucose privacy and recovery after oxygen-glucose deprivation and recovery of hypoxic-inducible factor-1 伪 hypoxia-inducible factor-1 伪 (HIF-laA) in hippocampal neurons after OGD/R injury in rats and to explore the effect of H2S on HIF-la-la-induced by hypoxia inducible factor 1 伪 hypoxia-inducible factor-1 伪 (HIF-laa) in hippocampal neurons after injury of hypoxia inducible factor 1 伪 hypoxia-inducible factor-1 伪 (HIF-laa). Methods Neuron specific enolase neuron-specific enolase (NSE) immunohistochemical method was used to identify the neurons in hippocampal neurons of fetal rats on the 16th to 18th day of gestation. Hypoxia / reoxygenation injury was induced by OGD1h/R24h on the 8th day of culture. The hippocampal neurons of rats were randomly divided into three groups: normal culture group (group 鈪
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