目的观察糖尿病大鼠肾小管上皮细胞转分化及氯沙坦对其的影响,探讨ARB糖尿病肾病保护作用中与TEMT有关的新机制。方法50只雄性W istar大鼠随机分为对照组(n=10只)和糖尿病模型组(n=40只);模型组大鼠给予腹腔内一次注射链脲佐菌素(STZ)60mg/kg诱导糖尿病模型。模型成功后再随机分为糖尿病组和氯沙坦组。氯沙坦组给予氯沙坦20mg/kg.d-1一次灌胃。于干预后第16周测定尿蛋白和内生肌酐清除率;光镜观察肾小管间质损害及纤维化;免疫组织化学法检测肾小管上皮细胞TGF-β1、V im entin和α-SMA表达,并对结果进行半定量分析。结果糖尿病组大鼠24 h尿蛋白排泄增加(P<0.01),肾小管上皮细胞α-SMA、V im entin和TGF-β1阳性表达面积分别为0.3690±0.0587,0.1546±0.0141和0.3716±0.0657;氯沙坦组大鼠24 h尿蛋白排泄较糖尿病组减少,肾小管间质损伤和间质纤维化程度减轻;其肾小管上皮细胞α-SMA、V im entin及TGF-β1表达较糖尿病组显著下调(P<0.01)。结论氯沙坦能显著下调糖尿病大鼠肾小管上皮细胞α-SMA、V im e...
【英文摘要】
Objective To observe the renal tubular epithelial cells transdifferentiation and the effects of Losartan on streptozotocin-induced diabetic rats,explore the renal protective mechanisms of ARB in DN.Methods Fifty Wistar rats were randomly divided into three groups:(1) Normal control group without streptozotocin-induced diabetes and without therapy(n=10);(2)diabetes without therapy group(n=20),(3)diabetes therapy group with Losartan 20 mg/Kg ·d~(-1)(n=20);Rat models of diabetic mellitus were established by in...