NRG-1β干预抗氧化酶SOD、NQO1在脑出血大鼠血肿周围表达及作用机制研究
发布时间:2018-08-22 13:43
【摘要】:目的:研究神经调节素-1β(neuregulin-1β,NRG-1β)对脑出血(intracerebral hemorrhage,ICH)血肿组织周围超氧化物歧化酶(Superoxide dismutase,SOD)和醌氧化还原酶(NADPH:quinine oxidoreductase,NQO1)表达的影响,评估脑水肿和神经功能障碍程度,进而探讨NRG-1β在脑出血的神经保护作用及机制。方法:选取健康雄性SD大鼠58只,采用立体定位尾状核注射Ⅳ型胶原酶建立大鼠脑出血模型。假手术组12只雄性SD大鼠,按上述方法同位置注射生理盐水。成功制备48只脑出血模型大鼠纳入统计学范围,随机分成模型组、NRG-1β治疗组(2ug/kg),每组24只。每组再分为两个时间点:24h、72h,根据各时间点再分为两个亚组。假手术组每个亚组各6只大鼠,模型组和NRG-1β治疗组每个时间点12只。术后按既定时间点分别处死大鼠,采用改良的神经功能缺损评分法(modified neurological severity score,m NSS)评估各组大鼠神经功能障碍程度,应用干-湿重法测定ICH后脑组织含水量,免疫印迹、免疫组化分别检测大鼠脑血肿周围组织抗氧化酶SOD、NQO1的表达水平。结果:1.与假手术组相比,模型组和NRG-1β治疗组脑组织含水量明显增多在大鼠ICH后24h和72h时间点,有统计学意义(P0.05)。NRG-1β治疗组各时间点脑组织含水量与模型组相比降低,统计学分析有意义(P0.05),提示NRG-1β能够减轻ICH急性期脑水肿程度。2.与假手术组相比,模型组和NRG-1β治疗组神经功能障碍明显在大鼠ICH后24h和72h时间点,有统计学意义(P0.05)。与模型组同时间点比较,NRG-1β治疗组神经功能障碍程度明显减轻,统计学分析有意义(P0.05),表明NRG-1β能够改善ICH急性期神经功能障碍。3.各组大鼠脑血肿周围组织免疫结果显示,假手术组仅在进针部位可见散在分布的单个SOD、NQO1阳性颗粒细胞表达,各时间点比较无明显差异。在24h和72h时间点模型组和NRG-1β治疗组可观察到在大鼠ICH周围组织表达明显的SOD、NQO1阳性颗粒,以神经元细胞、小胶质细胞、中性粒细胞等多见。与模型组相比,NRG-1β治疗组相同时间点SOD、NQO1阳性颗粒数量更显著,差异有统计学意义(P0.05),表明在ICH急性期,NRG-1β能够上调抗氧化酶SOD、NQO1表达。4.各组大鼠脑血肿周围组织Western Blot检测结果显示,模型组和NRG-1β组均可见较亮的SOD、NQO1蛋白条带影在大鼠ICH后24h和72h时间点。与假手术组相比,模型组和NRG-1β治疗组各时间点SOD、NQO1相对蛋白灰度值均较高(P0.05),差异有统计学意义。NRG-1β治疗组各时间点SOD、NQO1相对蛋白灰度值高于模型组,统计学分析有意义(P0.05),表明NRG-1β在大鼠ICH后急性期能够上调抗氧化酶SOD、NQO1水平。结论:在ICH损伤急性期,NRG-1β能够增加抗氧化酶SOD、NQO1水平,减少自由基生成,减轻氧化应激,显著改善脑水肿及神经功能障碍,发挥神经保护作用。
[Abstract]:Objective: to study the effect of neuregulin-1 尾 (neuregulin-1 尾 -NRG-1 尾) on the expression of Superoxide dismutase (Superoxide dismutase) and NADPH:quinine oxidoreductase (NADPH:quinine) NQO1, and to evaluate the degree of brain edema and neurological dysfunction in patients with intracerebral hemorrhage. To explore the neuroprotective effect and mechanism of NRG-1 尾 in intracerebral hemorrhage. Methods: 58 male Sprague-Dawley rats were selected and intracerebral hemorrhage model was established by injection of type 鈪,
本文编号:2197274
[Abstract]:Objective: to study the effect of neuregulin-1 尾 (neuregulin-1 尾 -NRG-1 尾) on the expression of Superoxide dismutase (Superoxide dismutase) and NADPH:quinine oxidoreductase (NADPH:quinine) NQO1, and to evaluate the degree of brain edema and neurological dysfunction in patients with intracerebral hemorrhage. To explore the neuroprotective effect and mechanism of NRG-1 尾 in intracerebral hemorrhage. Methods: 58 male Sprague-Dawley rats were selected and intracerebral hemorrhage model was established by injection of type 鈪,
本文编号:2197274
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