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Calcium-sensing receptors.

William G Goodman1

  • 1Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA. wgoodman@ucla.edu

Seminars in Nephrology
|January 20, 2004
PubMed
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The calcium-sensing receptor (CaSR) regulates calcium levels by sensing blood calcium and influencing parathyroid hormone. CaSR activation has implications for bone and mineral metabolism disorders.

Area of Science:

  • Physiology
  • Endocrinology
  • Molecular Biology

Background:

  • Extracellular calcium concentration variations impact physiological functions across tissues via the calcium-sensing receptor (CaSR).
  • In parathyroid tissue, CaSR mediates the detection of blood ionized calcium, modulating parathyroid hormone (PTH) secretion to maintain serum calcium homeostasis.
  • CaSR also plays roles in kidney function, regulating calcium excretion and electrolyte/water transport, and is present in other tissues like the intestine, placenta, and brain.

Purpose of the Study:

  • To elucidate the physiological roles of the calcium-sensing receptor (CaSR) in various tissues.
  • To explore the potential of CaSR as a therapeutic target for disorders of bone and mineral metabolism.
  • To understand the involvement of CaSR in parathyroid gland hyperplasia, particularly in chronic kidney disease.

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Main Methods:

  • Review of existing literature on calcium-sensing receptor (CaSR) physiology and function.
  • Analysis of CaSR's role in parathyroid hormone secretion and calcium homeostasis.
  • Investigation of CaSR's signaling pathways in different tissue types.

Main Results:

  • CaSR is crucial for maintaining calcium homeostasis by sensing blood calcium and regulating PTH secretion.
  • CaSR influences renal calcium excretion and water/electrolyte transport in the kidney.
  • CaSR activation is linked to cell cycle regulation, potentially relevant to secondary hyperparathyroidism pathogenesis.

Conclusions:

  • The calcium-sensing receptor (CaSR) is a key regulator of calcium homeostasis and has diverse physiological roles.
  • CaSR represents a promising therapeutic target for managing bone and mineral metabolism disorders.
  • Further research is needed to fully understand the functional importance of other calcium-ion-responsive receptors.