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Klotho attenuates diabetic nephropathy in db/db mice and ameliorates high glucose-induced injury of human renal glomerular endothelial cells.
Cell Cycle 2019 Februrary 21
Glomerular endothelial cell injury plays an important role in the development and progression of diabetic nephropathy (DN). The expression and function of klotho in glomerular endothelial cells remain unclear. Thus, this study aimed to investigate the expression and the functional role of klotho in DN progression in mice and in high glucose (HG)-induced cell injury of human renal glomerular endothelial cells (HRGECs) and the underlying mechanism. In this study, HRGECs were cultured with media containing HG to induce endothelial cell injury and db/db mice were used as DN model mice. Klotho was overexpressed or knocked down in HRECs to evaluate its role in HG-induced HRGECs injury. klotho-overexpressing adenovirus (rAAV-klotho) was injected into db/db mice via the tail vein to further validate the protective effect of klotho in DN. Decreased klotho expression was observed in DN patients, DN mice, and HG-exposed HRGECs. Furthermore, klotho overexpression significantly abolished the HG-induced HRGECs injury and activation of Wnt/β-catenin pathway and RAAS. In contrast, klotho knockdown exerted the opposite effects. Moreover, klotho attenuated diabetic nephropathy in db/db mice, which was also associated with inhibition of the Wnt/β-catenin pathway and RAAS. In conclusion, klotho attenuates DN in db/db mice and ameliorates HG-induced injury of HRGECs.
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