Parathyroid hormone ( PTH) is an important hormone secreted by parathyroid cells , and regulates the metabolism of calcium and phosphorus in the body .In recent years , the toxic effect of PTH on myocardium has been re-ported.Calcium-sensing receptor (CaSR), a member of G protein-coupled receptor family, can feel the subtle change of extracellular calcium concentration and regulate intracellular calcium concentration through multifarious ways in order to control the secretion of PTH .The expression of CaSR is observed in parathyroid cells , renal tubular epithelial cells , myo-cardial cells, etc.Intracellular calcium, as a second messenger, participates in various cell functions , such as excitation-contraction coupling , fertilization and so on .The injury of myocardial cells is intimately linked with high concentrations of PTH and intracellular calcium , and high expression of CaSR .
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