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Reactive oxygen species contribute significantly to renal inflammation and fibrosis, but most research has focused on superoxide and hydrogen peroxide (H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub>). The animal heme peroxidases myeloperoxidase (MPO), eosinophil peroxidase (EPX), and peroxidasin (PXDN) uniquely metabolize H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub>into highly reactive and destructive hypohalous acids, such as hypobromous and hypochlorous acid. However, the role of these peroxidases and their downstream hypohalous acids in the pathogenesis of renal fibrosis is unclear. Our study defines the contribution of MPO, EPX, and PXDN to renal inflammation and tubulointerstitial fibrosis in the murine unilateral ureteral obstruction (UUO) model. Using a nonspecific inhibitor of animal heme peroxidases and peroxidase-specific knockout mice, we find that loss of EPX or PXDN, but not MPO, reduces renal fibrosis. Furthermore, we demonstrate that eosinophils, the source of EPX, accumulate in the renal interstitium after UUO. These findings point to EPX and PXDN as potential therapeutic targets for renal fibrosis and CKD and suggest that eosinophils modulate the response to renal injury.<\/jats:p>","DOI":"10.1152\/ajprenal.00291.2018","type":"journal-article","created":{"date-parts":[[2018,12,19]],"date-time":"2018-12-19T16:21:57Z","timestamp":1545236517000},"page":"F360-F371","source":"Crossref","is-referenced-by-count":39,"title":["Peroxidasin and eosinophil peroxidase, but not myeloperoxidase, contribute to renal fibrosis in the murine unilateral ureteral obstruction model"],"prefix":"10.1152","volume":"316","author":[{"given":"Selene","family":"Colon","sequence":"first","affiliation":[{"name":"Division of Nephrology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee"},{"name":"Vanderbilt Center for Kidney Disease, Vanderbilt University Medical Center, Nashville, 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