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Interactions between FGF23 and vitamin D.

Mohammed S Razzaque1

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Summary
This summary is machine-generated.

Fibroblast growth factor-23 (FGF23) and vitamin D exhibit counter-regulation to maintain mineral homeostasis. FGF23 inhibits vitamin D activation, while vitamin D stimulates FGF23 production, forming a critical feedback loop.

Keywords:
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Area of Science:

  • Endocrinology
  • Mineral Metabolism
  • Molecular Biology

Background:

  • Fibroblast growth factor-23 (FGF23) is a key hormone regulating phosphate and vitamin D homeostasis.
  • FGF23 influences vitamin D metabolism by modulating renal 1α-hydroxylase and 24-hydroxylase activity.
  • A reciprocal regulatory relationship exists between FGF23 and active vitamin D (1,25(OH)2D3).

Purpose of the Study:

  • To elucidate the counter-regulatory mechanisms between FGF23 and vitamin D.
  • To investigate the impact of FGF23 on vitamin D activation and degradation.
  • To examine the role of vitamin D in regulating FGF23 synthesis and release.

Main Methods:

  • Genetic ablation of FGF23 activity in mice.
  • Genetic ablation of 1α-hydroxylase activity in mice.
  • Measurement of serum and renal vitamin D metabolite levels.
  • Assessment of FGF23 levels in vivo.

Main Results:

  • Mice lacking FGF23 activity showed increased renal 1α-hydroxylase and serum 1,25(OH)2D3.
  • Mice lacking 1α-hydroxylase activity exhibited reduced serum FGF23 levels.
  • These findings confirm a feedback loop where FGF23 suppresses vitamin D activation and vitamin D stimulates FGF23 production.

Conclusions:

  • FGF23 and vitamin D engage in a crucial counter-regulatory feedback system to maintain mineral balance.
  • Dysregulation of this FGF23-vitamin D axis is implicated in various human diseases.
  • Further research into the subcellular regulation of this axis is warranted for a comprehensive understanding in health and disease.