Endothelin receptor B controls the production of fibroblast growth factor 23.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Martina FegerMichael Föller

Abstract

Endothelin-1 (ET-1) is a member of the endothelin family of peptide hormones first discovered as endothelium-derived mediators regulating vascular tone. ET-1 also regulates the proliferation and differentiation of bone cells that synthesize fibroblast growth factor 23 (FGF23). FGF23 is a hormone controlling renal phosphate and vitamin D metabolism. Here, we studied the role of ET-1 and endothelin receptor B (ETB) for FGF23 production. Fgf23 gene expression was studied in IDG-SW3 bone cells by quantitative RT-PCR. ETB-expressing (etb+/+ ) and rescued ETB-deficient mice (etb-/- ) were studied in metabolic cages. Their serum FGF23, PTH, and 1,25(OH)2 D3 concentrations were determined by ELISA, serum and urinary phosphate and Ca2+ by photometric methods. ET-1 and ETB agonist sarafotoxin 6c suppressed Fgf23 mRNA in IDG-SW3 cells. Serum C-terminal and intact FGF23 as well as bone Fgf23 mRNA levels were significantly higher in etb-/- mice than in etb+/+ mice. Renal phosphate excretion was significantly higher in etb-/- mice despite lower phosphate levels. In addition, etb-/- animals exhibited calciuria and a significantly higher serum 1,25(OH)2 D3 concentration compared to etb+/+ mice. In conclusion, ETB-dependent ET-1 signaling is a ...Continue Reading

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