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Stroke:短暂局灶性脑缺血后IL - 4基因敲除小鼠的脑损伤加重

2011-07-03 MedSci原创 MedSci原创

背景和目的卒中可通过激活引起损伤的炎症反应导致脑损伤。假说认为抗炎细胞因子白细胞介素4(IL - 4)可减少IL - 4基因敲除(KO)的成年雄性小鼠卒中后损伤,我们对其进行了检验。 方法制作IL – 4敲除小鼠及野生型小鼠短暂性大脑中动脉阻塞模型。通过氯化三苯四唑染色法评估了梗死体积的预后,神经评分和自发活动评估了行为结果的预后以及免疫染色和体视学计数评估了细胞应答的预后。 结果与野生型小

背景和目的
卒中可通过激活引起损伤的炎症反应导致脑损伤。假说认为抗炎细胞因子白细胞介素4(IL - 4)可减少IL - 4基因敲除(KO)的成年雄性小鼠卒中后损伤,我们对其进行了检验。


方法
制作IL – 4敲除小鼠及野生型小鼠短暂性大脑中动脉阻塞模型。通过氯化三苯四唑染色法评估了梗死体积的预后,神经评分和自发活动评估了行为结果的预后以及免疫染色和体视学计数评估了细胞应答的预后。

结果
与野生型小鼠相比,IL - 4基因敲除小鼠24小时梗死体积明显增大,神经病学评分明显较差并且自发活动减少。IL - 4基因敲除小鼠梗死核心区可见巨噬细胞/小胶质细胞浸润增加,髓过氧化物酶阳性细胞数增加以及Th1/Th2比值增大。IL - 4基因敲除小鼠皮质半影区可见星形胶质细胞活性降低。在大脑中动脉闭塞前,脑室内重组IL -4治疗可显著减少IL - 4基因敲除小鼠梗死体积,改善神经学评分,减少巨噬细胞/小胶质细胞(浸润),并降低Th1/Th2比值,但野生型小鼠则无改变。

结论
IL - 4基因敲除小鼠IL - 4信号缺失与预后差相关,可通过给予外源性IL - 4逆转。预后差与核心部位炎症增加有关,给予外源性IL – 4后,IL – 4敲除小鼠的预后可逆转,而野生型小鼠则变化不明显。而这与IL - 4信号可减轻核心部位炎症相符,并可能有益于半影区星形胶质细胞活化。

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    2011-07-29 171.67.253.175

    怎么原文作者和单位都不放上,太不尊重别人劳动了

    0

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