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Erschienen in: Calcified Tissue International 4/2018

07.06.2018 | Original Research

Effect of Continuous Intravenous Calcium Loading on Fibroblast Growth Factor 23 in Normal and Uremic Rats

verfasst von: Yasuto Shikida, Masahide Mizobuchi, Takashi Inoue, Toma Hamada, Hiroaki Ogata, Fumihiko Koiwa, Takanori Shibata

Erschienen in: Calcified Tissue International | Ausgabe 4/2018

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Abstract

Fibroblast growth factor 23 (FGF23) is associated with mortality in patients with CKD. However, the mechanisms underlying stimulation of FGF23 remain to be investigated. We examined whether hypercalcemia induced by continuous intravenous (CIV) calcium (Ca) infusion regulates FGF23 levels in normal rats (Normal) and 5/6 nephrectomized uremic rats (Nx). Microinfusion pumps were implanted in the Normal and Nx rats for CIV Ca infusion, and blood, urine, kidney, and tibia were collected. The results showed an increase in serum Ca-stimulated FGF23 independently of serum phosphate (P) and creatinine levels in Normal and Nx rats. FGF23 mRNA from the tibia was also increased by the Ca infusion. Despite high FGF23 levels after Ca infusion, urinary P excretion was decreased. Renal α-Klotho expression was significantly reduced by Ca infusion. These results suggest that intravenous Ca loading might stimulate FGF23 production from bone in normal and uremic rats. Reduction of renal P excretion suggests that the bioactivity of FGF23 is inhibited, and the decrease in renal α-Klotho expression might have a role in this pathological process. In conclusion, CIV Ca loading increased FGF23 in normal and uremic rats, and renal α-Klotho is necessary to maintain the bioactivity of FGF23 as a phosphaturic factor.
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Metadaten
Titel
Effect of Continuous Intravenous Calcium Loading on Fibroblast Growth Factor 23 in Normal and Uremic Rats
verfasst von
Yasuto Shikida
Masahide Mizobuchi
Takashi Inoue
Toma Hamada
Hiroaki Ogata
Fumihiko Koiwa
Takanori Shibata
Publikationsdatum
07.06.2018
Verlag
Springer US
Erschienen in
Calcified Tissue International / Ausgabe 4/2018
Print ISSN: 0171-967X
Elektronische ISSN: 1432-0827
DOI
https://doi.org/10.1007/s00223-018-0440-2

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