高糖通过miR-192调控CAV-1/EGF影响肾小球系膜细胞增殖、迁移及细胞外基质形成的机制研究

目的 探讨高糖条件下miR-192对肾小球系膜细胞增殖、迁移及细胞外基质形成的影响及可能的作用机制。方法 体外培养人肾小球系膜细胞并分为6组：正糖（NG,5.6 mmol/L葡萄糖）组、高糖（HG,25 mmol/L葡萄糖）组、正糖加miR-192模拟物（NG+mimics）组、高糖加miR-192模拟物（HG+mimics）组、正糖加miR-192抑制剂（NG+inhibitor）组、高糖加miR-192抑制剂（HG+inhibitor）组。干预24 h后,CCK-8法检测细胞增殖活性,划痕实验检测细胞迁移能力,实时荧光定量PCR（qPCR）技术检测miR-192、小窝蛋白1（CAV-1）、表皮生长因子（EGF）、1型胶原蛋白（COLⅠ）、纤连蛋白（FN）mRNA水平,Western blot检测相关蛋白表达。结果 与NG组相比,HG组细胞增殖率和划痕愈合率增加,EGF、FN、COLⅠ mRNA和蛋白表达升高,CAV-1 mRNA和蛋白表达降低（均P<0.05）。在NG组和HG组分别加入miR-192 inhibitor后,细胞增殖率和划痕愈合率减少,EGF、FN、COLⅠmRNA和蛋白表达降低,CAV-1 mRNA和蛋白表达升高（均P<0.05）,HG组加入miR-192 inhibitor变化更加明显。在NG组和HG组分别加入miR-192 mimics后,细胞增殖率和划痕愈合率增加,EGF、FN、COLⅠ mRNA和蛋白表达升高,CAV-1 mRNA和蛋白表达降低（均P<0.05）。结论 高糖通过miR-192-CAV-1-EGF途径增加肾小球系膜细胞增殖和迁移,导致细胞外基质的形成。

Effects of high glucose on the proliferation and migration of mesangial cells and extracellular matrix formation by regulating the CAV-1/EGF through miR-192

Objective To investigate the effect of miR-192 on proliferation, migration and extracellular matrix of mesangial cells under high glucose condition. Methods Human mesangial cells were cultured in vitro for 24 h and divided into six groups: the normal glucose concentration (NG, 5.6 mmol/L glucose) group, the high glucose concentration (HG, 25 mmol/L glucose) group, the normal glucose concentration+miR-192 mimics (NG+mimics) group, the high glucose concentration+miR-192 mimics (HG+ mimics) group, the normal glucose concentration+miR-192 inhibitor (NG+inhibitor) group and the high glucose concentration+miR-192 inhibitor (HG+inhibitor) group. After 24 h of intervention, cell viability was detected by CCK-8 assay, the cell migration ability was detected by Scratch healing test, and expression levels of miR-192, caveolin 1 (CAV-1), epidermal growth factor (EGF), collagen type 1 (COLⅠ) and fibronectin (FN) mRNA and related proteins were detected by qPCR and Western blot assay. Results Compared with the NG group, the proliferation and migration rates were increased, the expression levels of EGF, FN and COLⅠmRNA and protein were increased, and the expression of CAV-1 mRNA and protein decreased in the HG group (all P<0.05). When miR-192 inhibitor was added to the NG group and the HG group, the cell proliferation and migration were decreased, the expression of EGF, FN and COLⅠ mRNA and protein were decreased, while the expression levels of CAV-1 mRNA and protein were increased (all P<0.05). Changes were more significant in the HG group after the addition of miR-192 inhibitor. After adding miR-192 mimics to the NG group and the HG group, the cell proliferation and migration increased, expression levels of EGF, FN and COLⅠ mRNA and protein increased, and the expression of CAV-1 decreased (all P<0.05). Conclusion High glucose increases the proliferation and migration of glomerular mesangial cells through miR-192-CAV-1-EGF pathway, leading to the formation of extracellular matrix and participating in the occurrence and development of diabetic nephropathy.