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- Title
Endothelial HIF-2 mediates protection and recovery from ischemic kidney injury.
- Authors
Kapitsinou, Pinelopi P.; Hideto Sano; Michael, Mark; Hanako Kobayashi; Davidoff, Olena; Bian, Aihua; Bing Yao; Ming-Zhi Zhang; Harris, Raymond C.; Duffy, Kevin J.; Erickson-Miller, Connie L.; Sutton, Timothy A.; Haase, Volker H.
- Abstract
The hypoxia-inducible transcription factors HIF-1 and HIF-2 mediate key cellular adaptions to hypoxia and contribute to renal homeostasis and pathophysiology; however, little is known about the cell type--specific functions of HIF-1 and HIF-2 in response to ischemic kidney injury. Here, we used a genetic approach to specifically dissect the roles of endothelial HIF-1 and HIF-2 in murine models of hypoxic kidney injury induced by ischemia reperfusion or ureteral obstruction. In both models, inactivation of endothelial HIF increased injury-associated renal inflammation and fibrosis. Specifically, inactivation of endothelial HIF-2α, but not endothelial HIF-1α, resulted in increased expression of renal injury markers and inflammatory cell infiltration in the postischemic kidney, which was reversed by blockade of vascular cell adhesion molecule-1 (VCAM1) and very late antigen-4 (VLA4) using monoclonal antibodies. In contrast, pharmacologic or genetic activation of HIF via HIF prolyl-hydroxylase inhibition protected wild-type animals from ischemic kidney injury and inflammation; however, these same protective effects were not observed in HIF prolyl-hydroxylase inhibitor--treated animals lacking endothelial HIF-2. Taken together, our data indicate that endothelial HIF-2 protects from hypoxia-induced renal damage and represents a potential therapeutic target for renoprotection and prevention of fibrosis following acute ischemic injury.
- Subjects
ISCHEMIA; KIDNEY injuries; HYPOXIA-inducible factors; HOMEOSTASIS; PATHOLOGICAL physiology
- Publication
Journal of Clinical Investigation, 2014, Vol 124, Issue 6, p2396
- ISSN
0021-9738
- Publication type
Article
- DOI
10.1172/JCI69073