单侧肾切除及微渗透泵灌注血管紧张素II诱导小鼠肾纤维化与高血压模型的建立

目的 建立单侧肾切除及微渗透泵灌注血管紧张素II诱导小鼠肾纤维化模型。方法 将36只雄性野生型 c57BL/6小鼠随机分为3组正常组、模型组、生理盐水对照组,每组12只。正常组不做处理,模型组行单侧肾切除及微渗透泵灌注血管紧张素II,生理盐水对照组行单侧肾切除及微渗泵灌注生理盐水。观察造模前及造模后第2周、第4周小鼠血压,及造模4周后的24 h尿蛋白定量、血肌酐、尿素氮、肾脏病理。结果 实验第二周时,生理盐水对照组(P<0.05)及模型组(P<0.01)的血压较正常组升高,模型组较生理盐水对照组也升高(P<0.05);实验第四周时,模型组血压较正常组(P<0.01)及生理盐水对照组(P<0.05)均升高。模型组的血肌酐、血尿素氮数值较正常组均上升(P<0.05);模型组24 h尿蛋白定量数值较正常组与生理盐水对照组的升高(P<0.01),模型组HE染色结果近曲小管上皮细胞浑浊肿胀;模型组Masson染色结果胶原纤维阳性率显著高于正常组和生理盐水对照组(P<0.05)。结论 单侧肾切除+微渗透泵灌注血管紧张素II可以成功建立小鼠肾纤维化模型及高血压模型。

Establishment of a mouse model of renal fibrosis and hypertension induced by unilateral nephrectomy and infusion of angiotensin II using a micro-osmotic pump

Objective To establish a mouse model of renal fibrosis and hypertension induced by unilateral nephrectomy and infusion of angiotensin II using a micro-osmotic pump. Methods Thirty-six 8-week old wild type male c57BL/6 mice were randomly divided equally into three groups. The normal group was not treated, model group underwent unilateral nephrectomy and infusion of angiotensin II using a micro-osmotic pump, and the saline control group underwent unilateral nephrectomy and infusion of physiological saline using a micro-osmotic pump. Blood pressure was measured before and two and four weeks after modeling. The 24 h urine protein quantity, serum creatinine (Scr), and blood urea nitrogen (BUN) were measured, and renal pathology was examined at 4 weeks after modeling. Results At 2 weeks of the experiment, the blood pressure in the saline control group and model group was significantly higher compared with that of the normal group (P<0.05, P<0.01), and the blood pressure of the model group was significantly higher than that of the saline control group (P<0.05). Four weeks after operation, the blood pressure in the model group was still higher than that of the normal group (P<0.01) and the saline control group (P<0.05). Both the levels of Scr and BUN in the saline control group and model group were significantly higher than those of the control group (P<0.05, P<0.05). The 24 h urine protein quantity in the model group was markedly higher compared with that of the saline control group and normal group (P<0.01). The pathological examination showed that proximal tubular epithelial cells were swollen in the model group. Histology using Masson staining showed that the positive rate of collagen fibers in the model group was significantly higher than that of the normal group and saline control group (P<0.05).Conclusions Our results demonstrate that a mouse model of renal fibrosis and hypertension can be successfully established by unilateral nephrectomy and infusion of angiotensin II using a micro-osmotic pump.