血管紧张素Ⅱ灌注大鼠模型肾小球足细胞损伤观察

目的:复制AngⅡ致肾脏损伤模型,初步观察在高浓度AngⅡ和高血压状态下足细胞损伤改变。方法:SD大鼠随机分为A、B、C3组,A、B组分别皮下埋置渗透性微泵,以200ng/(kg·min)、400ng/(kg·min)浓度持续灌注AngⅡ,C组为对照组,由生理盐水代替AngⅡ。每周测量体重、收缩压、24h尿蛋白,并用podocalyxin标记的间接免疫荧光法计数尿液足细胞,于第2和第4周末处死动物,留取电镜和光镜标本观察病理学改变。结果:A、B组大鼠在植入微泵后收缩压和尿蛋白在第1周时即增高,后持续增加。第2周肾小球光镜病理改变不明显,第4周可见系膜基质增多等病理变化;电镜观察2周时部分足突融合,4周时足突广泛融合,足突间隙狭窄。第1周开始A、B组部分大鼠尿液可检测到足细胞,随实验进展逐渐增多,尿足细胞排泄与收缩压和24h尿蛋白成正相关关系(r值分别为0.526、0.721,P<0.05)。结论:外源性灌注AngⅡ可成功复制AngⅡ致肾脏损伤模型,在此模型中足细胞主要在超微结构水平发生改变,尿液足细胞检测可以作为足细胞损伤的敏感指标反映体内足细胞损伤状态。

Study of glomerular podocye injury in rats with an infusion of angiotensin Ⅱ

Objective To establish a rat model of renal impairment induced by AngⅡand to explore the changes of the impaired podocytes in the state of hypertension due to the high Ang Ⅱlevel. Methods 36 rats were randomly divided into three groups. The rats in Group A and B were administered with AngⅡ(200 ng/(kg·min) and 400 ng/(kg·min)respectively) via subcutaneous osmotic minipumps, and the rats in Group C with normal saline. Body weight, systolic pressure, and the content of uric protein for 24 hours were measured a...