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Related Experiment Videos

Cell surface, Ca2+(cation)-sensing receptor(s): one or many?

D Riccardi1

  • 1School of Biological Sciences, University of Manchester, UK. RICCARDI@fs1.scg.man.ac.uk

Cell Calcium
|December 22, 1999
PubMed
Summary
This summary is machine-generated.

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The calcium-sensing receptor (CaR) regulates extracellular calcium levels, crucial for bodily functions. This review explores CaR

Area of Science:

  • Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Extracellular calcium concentration ([Ca2+]o) is vital for numerous mammalian processes, including bone mineralization, blood coagulation, and membrane excitability.
  • A complex homeostatic system, involving parathyroid glands, kidneys, bones, and the intestine, tightly controls [Ca2+]o.
  • The extracellular calcium-sensing receptor (CaR) is a key regulator within this system, influencing parathyroid hormone secretion and mineral ion excretion/reabsorption.

Purpose of the Study:

  • To describe the discovery of the calcium-sensing receptor (CaR), a novel class of ion-sensing receptors.
  • To elucidate the receptor-effector coupling mechanisms associated with CaR.
  • To review the known and potential roles of CaR both within and outside the calcium homeostasis system.

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Main Methods:

  • Literature review of CaR discovery and characterization.
  • Analysis of CaR's structural classification as a G protein-coupled receptor.
  • Examination of studies investigating CaR presence in various organs and its functional implications.

Main Results:

  • CaR was initially identified in bovine parathyroid glands and subsequently found in numerous other organs.
  • CaR belongs to the G protein-coupled receptor superfamily, sharing structural similarities with other receptors.
  • Beyond its established role in calcium homeostasis, CaR's function in organs like the brain, stomach, and skin is under investigation, potentially involving chemotaxis, cell proliferation, and apoptosis.

Conclusions:

  • The calcium-sensing receptor (CaR) is a critical component of calcium homeostasis.
  • CaR's presence extends to diverse tissues, suggesting broader physiological roles beyond mineral ion regulation.
  • Further research is needed to fully understand the multifaceted functions of CaR in various cellular and organ systems.