从HIF-1信号通路探讨六味地黄汤干预5/6肾切除大鼠肾间质纤维化实验研究
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摘要
目的:观察六味地黄汤对5/6肾切除大鼠肾间质纤维化的影响,从HIF-1信号通路探讨其作用机制。
     方法:80只健康雄性SD大鼠随机分成空白对照组、假手术组、模型组、六味地黄汤组和依那普利组。采用5/6肾切除法复制肾间质纤维化动物模型,造模12周后处死动物,收集大鼠尿液检测24h尿蛋白,腹主动脉采血检测血尿素氮(BUN)和血清肌酐(SCr)水平,观察肾功能变化;HE、Masson染色观察大鼠肾组织形态学改变;免疫组化、ⅤVestern blot法检测Ⅰ型胶原(Col Ⅰ)、Ⅲ型胶原(ColⅢ)、纤维连接蛋白(FN)蛋白表达水平,观察肾组织细胞外基质积聚的情况;免疫组化、Western blot.RT-PCR法检测肾组织缺氧诱导因子1α (HIF-1α).结缔组织生长因子(CTGF)、血浆纤溶酶原激活物抑制物-1(PAI-1)、金属基质蛋白酶组织抑制因子-1(TIMP-1)蛋白及mRNA的表达,观察HIF-1信号通路对肾间质纤维化的影响。
     结果:
     1、六味地黄汤能降低5/6肾切除12周后大鼠24h尿蛋白,能降低BUN和SCr水平,能减轻大鼠肾组织肾小球硬化、肾小管萎缩及间质纤维化程度,具有保护和修复肾脏组织的作用。
     2、六味地黄汤能降低5/6肾切除12周后大鼠肾组织中ColⅠ、ColⅢ、 FN蛋白表达水平,具有改善细胞外基质积聚的作用。
     3、六味地黄汤能降低5/6肾切除12周后大鼠肾组织HIF-1α、 CTGF、PAI-1、TIMP-1蛋白及:mRNA表达水平,具有下调HIF-1信号通路,延缓肾间质纤维化的作用。
     结论:六味地黄汤能改善晚期肾间质纤维化大鼠肾功能、减轻肾脏组织形态变化及减少细胞外基质的积聚,其作用机制可能通过抑制HIF-1信号通路,因而明确了其抗肾间质纤维化的作用机制,同时HIF-1α可作为抗肾间质纤维化治疗的新靶点。
Objective:To observe the effect of Liuweidihuang Decoction on renal interstitial fibrosis in rats with5/6nephrectomy, and to explore its mechanism from the HIF-1signal pathway.
     Methods:Eighty healthy male Sprapue-Demey rats were randomly divided into blank control group, sham operation group, model group, Liuweidihuang Decoction group and enalapril group. The method of5/6nephrectomy was used to construct animal model of renal interstitial fibrosis. Rats were killed after12weeks, urine and abdominal aortic blood were collected to test24h urine protein, BUN and SCr respectively, which to monitor the changes of renal function. HE and Masson staining methods were used to observe the morphological changes of the renal tissues in rats. Immunohistochemistry and Western blot method were used to detect expression level of Col I, Col III and FN protein, which to observe the deposition of extracellular matrix. Immunohistochemistry, Western blot and RT-PCR methods were used to detection of expression levels of HIF-1a, CTGF, PAI-1and TIMP-1, which to observe the effect of HIF-1signal pathway on renal interstitial fibrosis.
     Result:
     1. Liuweidihuang Decoction can reduce24h urine protein, BUN and SCr levels in rats with5/6nephrectomy after12weeks. It also can attenuate the renal tissue of rats with glomerulosclerosis, tubular atrophy and interstitial fibrosis. Liuweidihuang Decoction has the function of protect and restore kidney.
     2. After12weeks, Liuweidihuang Decoction decrease expression levels of Col I, Col Ⅲand FN protein in rats renal tissue with5/6nephrectomy, and it also can inhibit the deposition of extracellular matrix.
     3. Liuweidihuang Decoction can reduce the expression protein and mRNA levels of HIF-1α, CTGF, PAI-1, TIMP-1in rats renal tissue with5/6nephrectomy after12weeks. It has the role for down-regulating HIF-1signaling pathway and delaying the interstitial fibrosis of renal.
     Conclusion:Liuweidihuang Decoction can improve renal interstitial fibrosis of kidney function, relieve pathological advancement of renal tissue and inhibit the extracellular matrix accumulation, and its mechanism of renal interstitial fibrosis may be correlated with down-regulation of HIF-1signaling pathway. Our results suggest HIF-1α can be used as a new target of renal interstitial fibrosis therapy.
引文
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