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Welsh, Gavin I.; Hale, Lorna J.; Eremina, Vera; Jeansson, Marie; Maezawa, Yoshiro; Lennon, Rachel; Pons, Deborah A.; Owen, Rachel J.; Satchell, Simon C.; Miles, Mervyn J.; Caunt, Christopher J.; McArdle, Craig A.; Pavenstädt, Hermann; Tavaré, Jeremy M.; Herzenberg, Andrew M.; Kahn, C. Ronald; Mathieson, Peter W.; Quaggin, Susan E.; Saleem, Moin A.; Coward, Richard J.M.
Cell metabolism, 10/2010, Letnik: 12, Številka: 4Journal Article
Diabetic nephropathy (DN) is the leading cause of renal failure in the world. It is characterized by albuminuria and abnormal glomerular function and is considered a hyperglycemic “microvascular” complication of diabetes, implying a primary defect in the endothelium. However, we have previously shown that human podocytes have robust responses to insulin. To determine whether insulin signaling in podocytes affects glomerular function in vivo, we generated mice with specific deletion of the insulin receptor from their podocytes. These animals develop significant albuminuria together with histological features that recapitulate DN, but in a normoglycemic environment. Examination of “normal” insulin-responsive podocytes in vivo and in vitro demonstrates that insulin signals through the MAPK and PI3K pathways via the insulin receptor and directly remodels the actin cytoskeleton of this cell. Collectively, this work reveals the critical importance of podocyte insulin sensitivity for kidney function. Display omitted ► Podocyte-specific insulin resistance results in features of diabetic nephropathy ► Insulin signals to the podocyte via the insulin receptor and PI3K/MAPK pathways ► Insulin can rapidly remodel the actin cytoskeleton of the podocyte
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