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Specific endothelial heparin-binding EGF-like growth factor deletion ameliorates renal injury induced by chronic angiotensin II infusion

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Renal Physiology

Published online on

Abstract

Transactivation of EGF receptor (EGFR) by angiotensin II (Ang II) plays important roles in the initiation and progression of chronic kidney diseases. Studies suggest that heparin-binding EGF-like factor (HB-EGF) may be a critical mediator in this process, but its role in vivo has not been investigated. In the current study, we found that in response to Ang II-infusion, kidneys from endothelial HB-EGF deletion mice had significantly reduced EGFR activation compared to controls. Meanwhile, it decreased Ang II-infusion related renal injury, as demonstrated by 1) less albuminuria; 2) less glomerulosclerosis; 3) preserved endothelial integrity and decreased podocyte injury, as shown by greater glomerular tuft area and WT1 positive cells, and fewer apoptotic cells measured by cleaved caspase 3 staining; and 4), reduced Ang II-infusion induced renal inflammation as indicated by less infiltration of F4/80 positive macrophage and CD3 positive T lymphocytes and lower levels of proinflammatory cytokines, such as IL-6 and MCP-1 in both serum and kidney. In conclusion, our results suggest that shedding of HB-EGF from endothelium plays an important role in Ang II-induced renal injury by linking Ang II-AT1R with EGFR transactivation. Inhibition of HB-EGF shedding could be a potential therapeutic strategy for chronic kidney disease.