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作 者:邵滢[1] 吕川[1] 吴灿[1] 周月宏[2] 王秋月[1]
机构地区:[1]中国医科大学附属第一医院内分泌科,沈阳110001 [2] 沈阳市第八人民医院内分泌科
出 处:《中华内分泌代谢杂志》2016年第7期556-563,共8页Chinese Journal of Endocrinology and Metabolism
基 金:辽宁省高等学校“高端人才队伍建设工程”[(2014)187];2011年辽宁省“百千万人才工程”资助项目(2011377);辽宁省科技攻关计划项目(2011225017)
摘 要:目的探讨MicroRNA-217(Mir-217)、沉默信息调节因子1(Sirt1)及低氧诱导因子1α(HIF-1α)在高糖诱导大鼠肾小球系膜细胞( RMCs)炎症反应及纤维化中的作用。方法以Sirt1激活剂白藜芦醇预处理体外高糖培养的RMCs或转染Sirt1小干扰RNA( siRNA)、HIF-1αsiRNA及Mir-217抑制物。采用实时定量PCR检测Mir-217、Sirt1 mRNA、HIF-1αmRNA的表达,Western印迹检测Sirt1、HIF-1α、结缔组织生长因子(CTGF)、内皮素1、纤连蛋白(FN)的表达,酶联免疫吸附法检测转化生长因子-β1(TGF-β1)、血管内皮生长因子( VEGF)的表达。结果高糖促进RMCs中Mir-217、HIF-1α、CTGF、ET-1、FN、TGF-β1及VEGF的表达(均P<0.01),下调Sirt1表达(P<0.01)。 Mir-217基因沉默或25μmol/L白藜芦醇预处理可逆转高糖刺激的HIF-1α、CTGF、内皮素1、FN、TGF-β1及VEGF表达(均P<0.01)。结论在高糖培养的RMCs中,Mir-217通过调节Sirt1/HIF-1α通路促进炎症反应及纤维化,为Sirt1在糖尿病肾病中发挥保护作用的机制提供新的理论依据。Objective To explore the roles of MircroRNA-217 ( Mir-217 ) , silent information regulator 1 (Sirt1), and hypoxia-inducible factor-1α(HIF-1α)in high glucose-induced inflammation and fibrosis in rat glomerular mesangial cells( RMCs) . Methods RMCs were pre-incubated with a Sirt1 activator resveratrol prior to high glucose treatment or transfected with Sirt1 small interfering RNA( siRNA) , HIF-1αsiRNA, and Mir-217 inhibitor. Real-time PCR was used to analyze the expressions of Mir-217, Sirt1 mRNA, and HIF-1α mRNA; Western blot was used to observe the protein expressions of Sirt1, HIF-1α, connective tissue growth factor(CTGF), endothelin-1(ET-1), and fibronectin( FN) . Enzyme-linked immunosorbent assay was applied to detect protein expression of transforming growth factor-β1(TGF-β1)and vascular endothelial growth factor(VEGF). Results High glucose increased Mir-217, HIF-1α, CTGF, ET-1, FN, TGF-β1, and VEGF expressions(all P〈0. 01), while decreased Sirt1 expression. In addition, Mir-217 gene silencing or 25μmol/L resveratrol suppressed high glucose-stimulated expressions of HIF-1α, CTGF, endothelin-1, FN, TGF-β1, and VEGF(all P〈0. 01). Conclusion Mir-217 mediates high glucose-induced inflammation and fibrosis in RMCs via Sirt1/HIF-1αsignal pathway. This study provides new evidence to clarify the protective mechanisms of Sirt1 in diabetic nephropathy.
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