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Related Experiment Videos

Recent findings in phosphate homeostasis.

Dominique Prié1, Laurent Beck, Pablo Urena

  • 1Inserm U 426 et Institut Fédératif de Recherche 02, Faculty of Medicine, Xavier Bichat, Paris, France. prie@necker.fr

Current Opinion in Nephrology and Hypertension
|June 3, 2005
PubMed
Summary

Maintaining phosphate (Pi) homeostasis relies on sodium/inorganic phosphate (Na/Pi) cotransporters. Fibroblast growth factor 23 (FGF23) is key in regulating Pi levels, impacting health and lifespan.

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Area of Science:

  • Biochemistry
  • Physiology
  • Endocrinology

Background:

  • Sodium/inorganic phosphate (Na/Pi) cotransporters are vital for phosphate homeostasis.
  • Regulation of phosphate transport involves complex cellular and endocrine mechanisms.

Purpose of the Study:

  • To review recent findings on proteins interacting with Na/Pi cotransporters.
  • To summarize factors regulating Pi homeostasis and their pathological roles.

Main Methods:

  • Analysis of studies in animal models and cell lines.
  • Review of human genetic studies and clinical observations.

Main Results:

  • Identified proteins crucial for kidney Na/Pi cotransporter NPT2a trafficking and regulation by parathyroid hormone.

Related Experiment Videos

  • Highlighted calcitriol, Nedd-4, and serum glucocorticoid inducible kinase in controlling intestinal NPT2b expression.
  • Confirmed the central role of fibroblast growth factor 23 (FGF23) in Pi homeostasis, with mutations causing hypophosphatemic rickets and tumoral calcinosis.
  • Noted FGF23's involvement in chronic kidney disease-related hyperparathyroidism.
  • Identified novel phosphaturic factors and linked Klotho gene disruption to hyperphosphatemia and reduced lifespan.
  • Demonstrated that polymorphisms in Klotho influence vascular calcification and survival.

    • Conclusions:

    • Pi homeostasis is maintained by Na/Pi cotransporters in the intestine and kidney, regulated by cellular and endocrine factors, with FGF23 playing a pivotal role.
    • Proper Pi homeostasis control is essential, as elevated serum Pi and gene polymorphisms can affect aging and lifespan.