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Calcified Tissue International

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01.07.2014 | Original Research

Circulating FGF23 Levels in Response to Acute Changes in Plasma Ca²⁺

verfasst von: Eva Gravesen, Maria L. Mace, Jacob Hofman-Bang, Klaus Olgaard, Ewa Lewin

Erschienen in: Calcified Tissue International | Ausgabe 1/2014

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Abstract

The regulation of fibroblast growth factor 23 (FGF23) synthesis and secretion is still incompletely understood. FGF23 is an important regulator of renal phosphate excretion and has regulatory effects on the calciotropic hormones calcitriol and parathyroid hormone (PTH). Calcium (Ca) and phosphate homeostasis are closely interrelated, and it is therefore likely that Ca is involved in FGF23 regulation. It has recently been reported that dietary Ca influenced FGF23 levels, with high Ca increasing FGF23. The mechanism remains to be clarified. It remains unknown whether acute changes in plasma Ca influence FGF23 levels and whether a close relationship, similar that known for Ca and PTH, exists between Ca and FGF23. Thus, the aim of the present study was to examine whether acute hypercalcemia and hypocalcemia regulate FGF23 levels in the rat. Acute hypercalcemia was induced by an intravenous Ca infusion and hypocalcemia by infusion of ethylene glycol tetraacetic acid (EGTA) in normal and acutely parathyroidectomized rats. Intact plasma FGF23 and intact plasma PTH and plasma Ca²⁺ and phosphate were measured. Acute hypercalcemia and hypocalcemia resulted as expected in adequate PTH secretory responses. Plasma FGF23 levels remained stable at all plasma Ca²⁺ levels; acute parathyroidectomy did not affect FGF23 secretion. In conclusion, Ca is not a regulator of acute changes in FGF23 secretion.

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Titel: Circulating FGF23 Levels in Response to Acute Changes in Plasma Ca2+
verfasst von: Eva Gravesen
Maria L. Mace
Jacob Hofman-Bang
Klaus Olgaard
Ewa Lewin
Publikationsdatum: 01.07.2014
Verlag: Springer US
Erschienen in: Calcified Tissue International / Ausgabe 1/2014
Print ISSN: 0171-967X
Elektronische ISSN: 1432-0827
DOI: https://doi.org/10.1007/s00223-014-9861-8

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