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- W2022604691 abstract "The phosphaturic activity of intact, full-length, fibroblast growth factor-23 (FGF-23) is well documented. FGF-23 circulates as the intact protein and as fragments generated as the result of proteolysis of the full-length protein. To assess whether short fragments of FGF-23 are phosphaturic, we compared the effect of acute, equimolar infusions of full-length FGF-23 and various FGF-23 fragments carboxyl-terminal to amino acid 176. In rats, intravenous infusions of full-length FGF-23 and FGF-23 176–251 significantly and equivalently increased fractional phosphate excretion (FE Pi) from 14 ± 3 to 32 ± 5% and 15 ± 2 to 33 ± 2% (p < 0.001), respectively. Chronic administration of FGF-23 176–251 reduced serum Pi and serum concentrations of 1α,25-dihydroxyvitamin D. Shorter forms of FGF-23 (FGF-23 180–251 and FGF-23 184–251) retained phosphaturic activity. Further shortening of the FGF-23 carboxyl-terminal domain, however, abolished phosphaturic activity, as infusion of FGF-23 206–251 did not increase urinary phosphate excretion. Infusion of a short fragment of the FGF-23 molecule, FGF-23 180–205, significantly increased FE Pi in rats and reduced serum Pi in hyperphosphatemic Fgf-23 −/− knockout mice. The activity of FGF-23 180–251 was confirmed in opossum kidney cells in which the peptide reduced Na+-dependent Pi uptake and enhanced internalization of the Na+-Pi IIa co-transporter. We conclude that carboxyl terminal fragments of FGF-23 are phosphaturic and that a short, 26-amino acid fragment of FGF-23 retains significant phosphaturic activity." @default.
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- W2022604691 date "2007-02-27" @default.
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- W2022604691 title "Biological activity of FGF-23 fragments" @default.
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- W2022604691 doi "https://doi.org/10.1007/s00424-007-0231-5" @default.
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