益肾通络方对膜性肾病大鼠肾组织中转化生长因子-β1、Ⅳ型胶原mRNA表达的影响

摘要

Objective To observe the effects of Yishen Tongluo Decoction (YTD) on the renal mRNA expression of transforming growth factor-β1 ( TGF-β1) and collagen Ⅳ ( ColⅣ) in membranous nephropathy ( MN) rats. Methods SD rats were randomly divided into normal group, model group, benazepril group (in the dosage of 10 mg·kg-1·d-1) , YTD group ( in the dosage of 20 g·kg-1·d-1) . The rats in various groups were given intragastric administration of corresponding agents. At the end of the fourth week, 24-hour urinary protein quantity, albumin ( ALB) , total protein ( TP) , triglyceride ( TG) , total cholesterol ( TC) , blood urea nitrogen ( BUN) , and creatinine (Cr) levels were observed. The mRNA expression levels of TGF-β1 and ColⅣ in renal tissue of rats were detected by immunofluorescence method, electron microscopy and real-time polymerase chain reaction (PCR) method. Results In the model group, urinary protein quantity in rats was increased, serum levels of TP and ALB were significantly lowered, serum levels of TC and TG were significantly increased, renal pathological changes were present, and mRNA expression levels of TGF-β1 and ColIV in renal tissue were up-regulated (P<0.05 compared with normal group). Compared with the model group, 24-hour urinary protein quantity, TC and TG levels were significantly lowered, TP and ALB levels were significantly increased, rat renal injury was relieved, mRNA expression levels of TGF-β1 and ColIV in renal tissue were down-regulated in the treatment groups ( P<0.05) . However, the differences between benazepril group and YTD group were insignificant ( P>0.05) . Conclusion The therapeutic mechanism of YTD for MN is probably related with the inhibition of mRNA expression of TGF-β1 and ColⅣin renal tissue.%目的观察益肾通络方对膜性肾病(MN)大鼠肾组织中转化生长因子-β(transforming growth factor， TGF-β1)、Ⅳ型胶原（collagenⅣ， ColⅣ） mRNA表达的影响。方法将SD大鼠随机分为正常组、模型组、盐酸贝那普利组(剂量为10 mg·kg-1·d-1）、益肾通络方组(剂量为20 g·kg-1·d-1），各组按相应剂量灌胃，于第4周末观察24 h尿蛋白定量、白蛋白(ALB)、总蛋白(TP)、甘油三酯(TG)、总胆固醇(TC)、尿素氮(BUN)、肌酐(Cr)水平；采用免疫荧光、电镜及Real-time PCR法检测各组大鼠TGF-β1、 ColⅣmRNA在肾组织的表达。结果与正常组比较，模型组大鼠出现大量蛋白尿，血清TP、ALB水平均显著降低，血清TC、 TG水平均显著升高，肾组织出现病理损害，肾组织中TGF-β1、 ColⅣmRNA均显著上调(P<0.05)；与模型组比较，各治疗组24 h尿蛋白定量， TC、 TG水平均显著降低，血清TP、 ALB水平均显著升高，肾组织病理损害较轻，肾组织中TGF-β1、 ColⅣmRNA均显著下调(P<0.05)。盐酸贝那普利组与益肾通络方组比较差异无统计学意义(P>0.05)。结论益肾通络方对MN的治疗作用与其能够抑制TGF-β1、 ColⅣmRNA在肾组织中的表达有关。