VEGF受体抑制剂对I型糖尿病肾病大鼠足细胞病的治疗作用

目的:探讨血管内皮生长因子(VEGF)受体抑制剂SU5416对糖尿病肾病足细胞病的治疗作用。方法:SPF级SD雄性大鼠共30只,设为正常对照组(NC)、糖尿病肾病模型组(DN)、SU5416治疗组(SU5416),每组10只。DN大鼠由链脲菌素(STZ)诱导形成。SU5416治疗后第8周,分别测定大鼠体重(body we ight,BW)、肾重(k idney we ight,KW)、血糖(glucose,G lu)、大鼠24 h尿蛋白排泄率(24 h UAER)和血肌酐(Scr)。免疫荧光技术观察肾脏足细胞标记蛋白nephrin和podoc in表达,Real tim e-PCR技术检测nephrin、podoc in和VEGF mRNA水平,并观察肾脏病理变化。结果:与NC组大鼠相比,DN组大鼠BW明显下降,KW增加显著(P<0.05),24 h UAER、G lu和Scr均明显升高,肾组织VEGF mRNA水平明显升高,nephrin、podoc in蛋白水平及mRNA水平明显下降(P<0.05),肾小球基底膜增厚、系膜基质增生;SU5416治疗后大鼠肾脏病理改善,KW较DN组明显下降,24 hUAER明显降低,nephrin、podoc in蛋白水平及mRNA水平上调(P<0.05),但BW、G lu、Scr和VEGF mRNA水平治疗前后无统计学差异(P>0.05)。结论:SU5416治疗能降低DN大鼠24 h UAER、改善肾脏病理表现和上调肾小球足细胞标记蛋白nephrin和podoc in水平。表明VEGF受体抑制剂对DN的治疗作用与其足细胞保护有关,抑制VEGF活性可能成为控制DN足细胞病进展的治疗手段之一。

The effects of VEGF-R inhibitor on podocytopathy of rats with type I diabetic nephropathy

AIM: To explore the effect of VEGF inhibitor SU5416 on podocytopathy of rats with type I diabetic nephropathy.METHODS: Thirty male SD rats were randomly divided into three groups: normal control group(NC),diabetic nephropathy group(DN) and diabetic nephropathy treated with SU5416 group(SU5416).Rats with DN were induced by STZ.At the end of 8 weeks after SU5416 treatment,body weight(BW),kidney weight(KW),24 h urine albuminuria excretion rate(24 h UAER),plasma glucose and creatinine were detected respectively...