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钴原卟啉诱导HO-1表达增加对老龄小鼠骨骼肌组织氧化应激和炎症反应的影响

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Keywords: 血红素加氧酶,骨骼肌,老化,氧化应激,炎症反应

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Abstract:

目的探讨注射钴原卟啉(cobaltprotoporphyrin,CoPP)诱导血红素加氧酶-1(hemeoxygenase1,HO-1)表达增加在老龄小鼠骨骼肌微环境包括氧化应激、炎症反应的调节作用。方法分别将正常成年(2月龄)和老年(18月龄)C57BL/6雄性小鼠按照简单随机抽样法分为对照组及注射CoPP组;CoPP组小鼠连续3d腹腔注射CoPP溶液[5mg/(kg·d)],对照组注射同体积生理盐水。在3、7、14d后取新鲜腓肠肌组织,Westernblot检测HO-1(3d组)的表达,ELISA检测过氧化标志分子丙二醛(MDA)、过氧化氢(H2O2)含量及抗氧化酶类CuZn-超氧歧化酶(SOD)等活性变化。用老年C57BL/6小鼠建立腓肠肌损伤模型,采用简单随机抽样法分为CoPP处理组和对照组,分别在3、7、14d后检测中性粒细胞和M2型巨噬细胞浸润。结果正常老年组HO-1表达量高于成年组,老年组注射CoPP后HO-1表达升幅显著低于成年组(P<0.05);注射CoPP后,成年和老年组MDA、H2O2含量均下降,SOD、CuZn-SOD、GSH-Px和CAT酶活性升高,且老年CoPP组过氧化标志分子含量高于成年CoPP组,抗氧化酶活性较低(P<0.05)。骨骼肌损伤后3、7d,CoPP处理组中性粒细胞浸润均低于对照组;CD163阳性M2型巨噬细胞浸润出现较晚,且注射CoPP后,M2型巨噬细胞的浸润显著高于对照组。结论老年骨骼肌对CoPP的反应性下降,抗氧化应激能力下降。损伤后诱导HO-1表达增加能够降低早期中性粒细胞、促进M2型巨噬细胞的浸润,可能有助于骨骼肌损伤修复。

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