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We showed elevated IGF-1 expression in the DKD kidneys after 16 wk of diabetic onset. Intraperitoneal administration of IGF-1R inhibitor (glycogen synthase kinase-3\u03b2, GSK4529) from week 8 to week 16 postdiabetes induction ameliorated urinary albumin excretion and kidney histological changes due to diabetes, including amelioration of glomerulomegaly, inflammatory infiltration, and tubulointerstitial fibrosis. The GSK4529 treatment also attenuated alterations in renal tubular expression of E-cad and matrix protein fibronectin. Moreover, renal fibrosis in DKD (without treatment) was associated with Snail1 overexpression that was effectively prevented by IGF-1R inhibition. Further experiments in cultured renal epithelial cells (NRK) showed that IGF-1 silencing reproduced in vivo effects of IGF-1R inhibition with markedly attenuated Snail1 expression and near normalization of the Ecad1 and fibronectin expression pattern. Further Snail1 silencing prevented high-glucose-induced changes without affecting IGF-1 expression, consistent with Snail1 acting downstream to IGF-1. The antifibrotic effects were also shown with benazepril or insulin treatment but to a much lesser degree. In summary, in STZ-induced diabetic mice, activation of IGF-1 in diabetic kidneys induces fibrogenesis through Snail1 upregulation. The diabetes-related histological and functional changes, as well as fibrogenesis, can be attenuated by IGF-1\/IGF-1R inhibition.<\/jats:p>","DOI":"10.1152\/ajpendo.00071.2019","type":"journal-article","created":{"date-parts":[[2019,7,30]],"date-time":"2019-07-30T15:58:01Z","timestamp":1564502281000},"page":"E686-E698","source":"Crossref","is-referenced-by-count":37,"title":["IGF-1\/IGF-1R blockade ameliorates diabetic kidney disease through normalizing Snail1 expression in a mouse model"],"prefix":"10.1152","volume":"317","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2372-9833","authenticated-orcid":false,"given":"Rong","family":"Dong","sequence":"first","affiliation":[{"name":"Guozhou University School of medicine, Gui Yang, China"},{"name":"Department of Nephrology, Guizhou Provincial People\u2019s Hospital, Gui Yang, China"},{"name":"NHC Key Laboratory of Pulmonary Immunological Diseases, Guizhou Provincial People\u2019s Hospital, Gui Yang, 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