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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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Phosphate Transport in Epithelial and Nonepithelial Tissue.

Nati Hernando1, Kenneth Gagnon1, Eleanor Lederer1

  • 1University of Zurich-Irchel, Institute of Physiology, Zurich, Switzerland; Department of Medicine, University of Louisville School of Medicine, Louisville, Kentucky; and Robley Rex VA Medical Center, Louisville, Kentucky.

Physiological Reviews
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Phosphate transporters, crucial for life, regulate nutrient levels via SLC34 and SLC20 families. Understanding their nonredundant functions is key to preventing mineralization disorders.

Keywords:
epitheliumphosphate transport, sodium phosphate cotransporters

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Phosphate is vital for bone formation, cell structure, and energy metabolism (ATP).
  • Serum phosphate levels are tightly regulated, impacting bone mineralization and soft tissue calcification.
  • Sodium-dependent transporter proteins, SLC34 and SLC20 families, are key regulators of phosphate homeostasis.

Purpose of the Study:

  • To review the roles of SLC34 and SLC20 phosphate transporter families.
  • To highlight the importance of these transporters in regulating phosphate levels.
  • To emphasize the need for further research into phosphate transport mechanisms.

Main Methods:

  • Review of existing literature on phosphate transporters.
  • Analysis of the functions and regulation of SLC34 and SLC20 families.
  • Discussion of clinical implications of mutations in these transporters.

Main Results:

  • SLC34 isoforms (SLC34A1-A3) are tissue-specific, controlling intestinal absorption and renal excretion.
  • SLC34A2 regulates phosphate in various bodily fluids like milk and saliva.
  • SLC20 isoforms are ubiquitously expressed, responding to ambient phosphate levels for cellular needs.
  • Mutations in these transporters lead to distinct clinical presentations, indicating nonredundant functions.

Conclusions:

  • Phosphate transporters are essential for maintaining phosphate homeostasis and overall health.
  • The SLC34 and SLC20 families play distinct, nonredundant roles in phosphate regulation.
  • Further research is crucial to fully elucidate the complex functions and coordination of phosphate transporters, including intracellular transport.