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mTORC1 activation in podocytes is a critical step in the development of diabetic nephropathy in mice

Inoki, K. and Mori, H. and Wang, J. and Suzuki, T. and Hong, S. and Yoshida, S. and Blattner, S. M. and Ikenoue, T. and Ruegg, M. A. and Hall, M. N. and Kwiatkowski, D. J. and Rastaldi, M. P. and Huber, T. B. and Kretzler, M. and Holzman, L. B. and Wiggins, R. C. and Guan, K. -L.. (2011) mTORC1 activation in podocytes is a critical step in the development of diabetic nephropathy in mice. Journal of Clinical Investigation, 121 (6). pp. 2181-2196.

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Official URL: http://edoc.unibas.ch/dok/A5844193

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Abstract

Diabetic nephropathy (DN) is among the most lethal complications that occur in type 1 and type 2 diabetics. Podocyte dysfunction is postulated to be a critical event associated with proteinuria and glomerulosclerosis in glomerular diseases including DN. However, molecular mechanisms of podocyte dysfunction in the development of DN are not well understood. Here we have shown that activity of mTOR complex 1 (mTORC1), a kinase that senses nutrient availability, was enhanced in the podocytes of diabetic animals. Further, podocyte-specific mTORC1 activation induced by ablation of an upstream negative regulator (PcKOTsc1) recapitulated many DN features, including podocyte loss, glomerular basement membrane thickening, mesangial expansion, and proteinuria in nondiabetic young and adult mice. Abnormal mTORC1 activation caused mislocalization of slit diaphragm proteins and induced an epithelial-mesenchymal transition-like phenotypic switch with enhanced ER stress in podocytes. Conversely, reduction of ER stress with a chemical chaperone significantly protected against both the podocyte phenotypic switch and podocyte loss in PcKOTsc1 mice. Finally, genetic reduction of podocyte-specific mTORC1 in diabetic animals suppressed the development of DN. These results indicate that mTORC1 activation in podocytes is a critical event in inducing DN and suggest that reduction of podocyte mTORC1 activity is a potential therapeutic strategy to prevent DN.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Growth & Development > Biochemistry (Hall)
05 Faculty of Science > Departement Biozentrum > Neurobiology > Pharmacology/Neurobiology (Rüegg)
UniBasel Contributors:Hall, Michael N. and Rüegg, Markus A.
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Society for Clinical Investigation
ISSN:0021-9738
e-ISSN:1558-8238
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:08 Nov 2017 14:23
Deposited On:14 Sep 2012 06:38

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