宁巍 1,李静 2,漆秀洁 1,3,许峰 2,方芳 1
NING Wei1, LI Jing2, QI Xiu-jie1,3, XU Feng2, FANG Fang1
1. Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Training Base of Clinical Resident Standard Training in Chongqing, Children’s Hospital of Chongqing Medical University, Chongqing 400014, China; 2. Department of Pediatric Intensive Care Unit, Children’s Hospital of Chongqing Medical University, Chongqing 400014, China; 3. Department of Emergency Department, Children’s Hospital of Chongqing Medical University, Chongqing 400014, China
摘要:
目的 ·观察新生鼠和幼鼠高氧肺损伤的异同,并初步探索Rho/Rock信号通路在年龄相关高氧肺损伤中的作用。方法 ·将新生SD大鼠(新生鼠)与3周龄SD大鼠(幼鼠)分为新生鼠空气组、新生鼠高氧组、幼鼠空气组、幼鼠高氧组,建立动物模型直至第14日,统计生存率、体质量变化,取SD大鼠肺组织行病理学检查、损伤程度评分、羟脯氨酸含量测定、SOD与MDA检测,以及ROCK1、p-MYPT1、MYPT1表达的检测。结果 ·①新生鼠高氧组较新生鼠空气组、幼鼠空气组、幼鼠高氧组生存率明显降低,幼鼠空气组与高氧组生存率无明显差异;新生鼠高氧组较空气组、幼鼠高氧组较空气组体质量增长缓慢,且新生鼠高氧组较幼鼠高氧组体质量增长更为缓慢。②新生鼠高氧组、幼鼠高氧组出现肺组织损伤及纤维化改变,且新生鼠较幼鼠更为严重。③新生鼠高氧组较空气组、幼鼠高氧组较空气组MDA含量升高,SOD活力降低;与幼鼠高氧组相比,新生鼠高氧组SOD活力基础值较低且高氧后降低更为明显。④新生鼠高氧组较空气组、幼鼠高氧组较空气组肺组织ROCK1蛋白表达有上升趋势,p-MYPT1蛋白表达增强,且新生鼠高氧组较幼鼠高氧组p-MYPT1蛋白表达增强更为明显。结论 ·高氧肺损伤具有年龄依赖性,新生鼠对高氧耐受力明显弱于幼鼠,与其自身抗氧化能力弱有关;Rho/Rock信号通路活化程度的不同可能在年龄相关高氧肺损伤中发挥重要作用。