How are ionized serum calcium changes recognized by the parathyroid gland in the pathophysiology of hypocalcemia?

Updated: Aug 08, 2019
  • Author: Manish Suneja, MD, FASN, FACP; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

The parathyroid gland has a remarkable sensitivity to ionized serum calcium changes. These changes are recognized by the calcium-sensing receptor (CaSR), a 7-transmembrane receptor linked to G-protein with a large extracellular amino-terminal region. Binding of calcium to the CaSR induces activation of phospholipase C and inhibition of PTH secretion. On the other hand, a slight decrease in calcium stimulates the chief cells of the parathyroid gland to secrete PTH.


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