Hypertension is a major contributor to 20-hydroxyeicosatetraenoic acid-mediated kidney injury in diabetic nephropathy.

Gangadhariah MH, Luther JM, Garcia V, Paueksakon P, Zhang MZ, Hayward SW, Love HD, Falck JR, Manthati VL, Imig JD, Schwartzman ML, Zent R, Capdevila JH, Pozzi A
J Am Soc Nephrol. 2015 26 (3): 597-610

PMID: 25071086 · PMCID: PMC4341468 · DOI:10.1681/ASN.2013090980

In the kidney, 20-hydroxyeicosatetraenoic acid (20-HETE) is a primary cytochrome P450 4 (Cyp4)-derived eicosanoid that enhances vasoconstriction of renal vessels and induces hypertension, renal tubular cell hypertrophy, and podocyte apoptosis. Hypertension and podocyte injury contribute to diabetic nephropathy and are strong predictors of disease progression. In this study, we defined the mechanisms whereby 20-HETE affects the progression of diabetic nephropathy. We used Cyp4a14KO male mice that exhibit androgen-sensitive hypertension due to increased Cyp4a12-mediated 20-HETE production. We show that, upon induction of diabetes type 1 via streptozotocin injection, Cyp4a14KO male mice developed worse renal disease than streptozotocin-treated wild-type mice, characterized by increased albuminuria, mesangial expansion, glomerular matrix deposition, and thickness of the glomerular basement membranes. Castration blunted androgen-mediated Cyp4a12 synthesis and 20-HETE production, normalized BP, and ameliorated renal damage in diabetic Cyp4a14KO mice. Notably, treatment with a 20-HETE antagonist or agents that normalized BP without affecting Cyp4a12 expression and 20-HETE biosynthesis also ameliorated diabetes-mediated renal damage and albuminuria in Cyp4a14KO male mice. Taken together, these results suggest that hypertension is the major contributor to 20-HETE-driven diabetes-mediated kidney injury.

Copyright © 2015 by the American Society of Nephrology.

MeSH Terms (16)

Animals Collagen Cytochrome P-450 Enzyme System Cytochrome P450 Family 4 Diabetic Nephropathies Glomerular Basement Membrane Hydralazine Hydrochlorothiazide Hydroxyeicosatetraenoic Acids Hypertension Male Mice, Knockout Orchiectomy Renin-Angiotensin System Reserpine Sodium

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