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However, identification of targets that retard the progression of established DN\u2013which is more clinically relevant\u2013is lacking. Therefore, we tested the hypothesis that arginase inhibition would prevent the progression of established DN. Effects of arginase inhibition were compared with treatment with the angiotensin-converting enzyme inhibitor captopril, a current standard of care in DN. Experiments were conducted in Ins2<jats:sup>Akita<\/jats:sup>mice treated with the arginase inhibitor S-(2-boronoethyl)-l-cysteine (BEC) or captopril starting at 6 wk of age for 12 wk (early treatment) or starting at 12 wk of age for 6 wk (late treatment). Early and late treatment with BEC resulted in protection from DN as indicated by reduced albuminuria, histological changes, kidney macrophage infiltration, urinary thiobarbituric acid-reactive substances, and restored nephrin expression, kidney nitrate\/nitrite, kidney endothelial nitric oxide synthase phosphorylation, and renal medullary blood flow compared with vehicle-treated Ins2<jats:sup>Akita<\/jats:sup>mice at 18 wk of age. Interestingly, early treatment with captopril reduced albuminuria, histological changes, and kidney macrophage infiltration without affecting the other parameters, but late treatment with captopril was ineffective. These findings highlight the importance of arginase inhibition as a new potential therapeutic intervention in both early and late stages of diabetic renal injury.<\/jats:p>","DOI":"10.1152\/ajprenal.00137.2015","type":"journal-article","created":{"date-parts":[[2015,6,4]],"date-time":"2015-06-04T11:07:45Z","timestamp":1433416065000},"page":"F447-F455","source":"Crossref","is-referenced-by-count":28,"title":["Arginase inhibition: a new treatment for preventing progression of established diabetic nephropathy"],"prefix":"10.1152","volume":"309","author":[{"given":"Hanning","family":"You","sequence":"first","affiliation":[{"name":"Department of Medicine, Division of Nephrology, Penn State University College of Medicine, Hershey, Pennsylvania;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ting","family":"Gao","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Nephrology, Penn State University College of Medicine, Hershey, 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