右美托咪定对脓毒症小鼠炎症反应的影响及机制研究
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篇名: | 右美托咪定对脓毒症小鼠炎症反应的影响及机制研究 |
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摘要: | 目的:研究右美托咪定(Dex)对脓毒症小鼠炎症反应的影响及机制。方法:将小鼠随机分为正常对照组、模型组、微小RNA- 146a(miR-146a)抑制剂(50 mg/kg)+Dex(50 μg/kg)组和Dex低、中、高剂量组(10、30、50 μg/kg),每组10只。除正常对照组外,其余各组小鼠ip脂多糖建立脓毒症模型,0.5 h后ip相应药物。药物干预6 h后,实时荧光定量聚合酶链式反应法检测各组小鼠外周血单核细胞中miR-146a表达及其靶基因白细胞介素1(IL-1)受体相关激酶(IRAK1)、肿瘤坏死因子(TNF)受体相关因子6(TRAF6)mRNA表达,Western blot法检测外周血单核细胞中IRAK1、TRAF6蛋白的表达,酶联免疫吸附法检测血清中TNF-α、IL-6的水平。结果:与正常对照组比较,模型组小鼠的miR-146a表达增强,TNF-α、IL-6水平升高,IRAK1、TRAF6 mRNA和蛋白表达增强(P<0.01)。与模型组比较,Dex中、高剂量组小鼠外周血单核细胞中miR-146a表达增强,TNF-α、IL-6水平下降,IRAK1、TRAF6蛋白表达减弱(P<0.05或P<0.01),但IRAK1、TRAF6 mRNA表达变化不明显(P>0.05)。与Dex高剂量组比较,miR-146a抑制剂+Dex组小鼠外周血单核细胞中miR-146a表达减弱,TNF-α、IL-6水平升高,IRAK1、TRAF6蛋白表达增强(P<0.05或P<0.01),但IRAK1、TRAF6 mRNA表达变化不明显(P>0.05)。结论:Dex可抑制脓毒症小鼠炎症反应,其机制可能与诱导miR-146a表达、抑制Toll样受体4/核因子κB通路中的两个重要接头蛋白IRAKI和TRAF6的表达有关。 |
ABSTRACT: | OBJECTIVE: To study the effect and its mechanism of dexmedetomidine (Dex) on inflammatory response in septic mice. METHODS: Mice were randomly divided into normal control group, model group, miR-146a inhibitor (50 mg/kg)+Dex (50 μg/kg) group, Dex low-dose, medium-dose, high-dose groups (10, 30, 50 μg/kg), 10 in each group. Except for normal control group, other groups were intraperitoneally injected lipopolysaccharide to induce septic models, intraperitoneally injected relevant medicines after 0.5 h. After drug intervention for 6 h, miR-146a expression, IRAK1 and TRAF6 mRNA expressions in peripheral blood mononuclear cells in each group were detected by real-time fluorescence quantitative polymerase chain reaction method. IRAK1, TRAF6 protein expressions in peripheral blood mononuclear cells in each group were detected by Western blot method. TNF-α, IL-6 levels in serum were detected by enzyme-linked immunosorbent method. RESULTS: Compared with normal control group, miR-146a expression, TNF-α and IL-6 levels, IRAK1, TRAF6 mRNA and protein expressions in peripheral blood mononuclear cells in model group were increased (P<0.01). Compared with model group, miR-146a expression in peripheral blood mononuclear cells in Dex medium-dose, high-dose groups were increased; TNF-α and IL-6 levels, IRAK1, TRAF6 protein expressions were decreased (P<0.05 or P<0.01); while IRAK1, TRAF6 mRNA expressions changed less obviously (P>0.05). Compared with Dex high-dose group, miR-146a expression, in peripheral blood mononuclear cells in miR-146a inhibitor+Dex group was decreased; TNF-α and IL-6 levels, IRAK1, TRAF6 protein expressions were increased (P<0.05 or P<0.01); while IRAK1, TRAF6 mRNA expressions changed less obviously (P>0.05). CONCLUSIONS: Dex can inhibit the inflammatory response in septic mice. The mechanism may associate with inducing miR-146a expression and inhibiting the 2 important adaptor proteins IRAK1, TRAF6 expressions in Toll-like receptor 4/nuclear factor-κB pathway. |
期刊: | 2017年第28卷第19期 |
作者: | 郭茂,王文明 |
AUTHORS: | GUO Mao,WANG Wenming |
关键字: | 脓毒症;右美托咪定;miR-146a;炎症反应;小鼠;Toll样受体4/核因子κB |
KEYWORDS: | Sepsis; Dexmedetomidine; miR-146a; Inflammatory response; Mice; Toll-like receptor 4/nuclear factor-κB |
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