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Excessive phosphate levels, or hyperphosphatemia, disrupt cellular functions and cause organ damage. The fibroblast growth factor 23 (FGF23)-αKlotho system is key to maintaining phosphate balance and preventing toxicity.

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Fibroblast growth factor 23 (FGF23)Oxidative stressPhosphate toxicityPhosphate-induced signalingαKlotho

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Area of Science:

  • Biochemistry
  • Physiology
  • Toxicology

Background:

  • Phosphorus is vital for cellular functions like energy metabolism and nucleic acid synthesis.
  • The fibroblast growth factor 23 (FGF23)-αKlotho system regulates phosphate homeostasis in mammals.
  • Elevated phosphate levels (hyperphosphatemia) are toxic and linked to increased morbidity and mortality in humans.

Purpose of the Study:

  • To review the current understanding of phosphate toxicity.
  • To highlight the role of the FGF23-αKlotho system in phosphate balance.
  • To discuss the cellular mechanisms underlying phosphate-induced damage.

Main Methods:

  • Literature review of experimental studies on phosphate toxicity.
  • Analysis of data from cell and animal models of hyperphosphatemia.
  • Examination of the FGF23-αKlotho system's role in phosphate homeostasis.

Main Results:

  • Hyperphosphatemia causes extensive tissue damage, premature aging, and reduced lifespan in mouse models.
  • Cytotoxic and inflammatory effects of high phosphate are partly mediated by aberrant cell signaling and oxidative stress.
  • Disruption of the FGF23-αKlotho system leads to hyperphosphatemia and associated pathologies.

Conclusions:

  • Phosphate toxicity poses significant health risks, impacting multiple organ systems.
  • Maintaining phosphate homeostasis through systems like FGF23-αKlotho is crucial for preventing adverse health outcomes.
  • Further research into phosphate toxicity mechanisms can inform therapeutic strategies.