ESPE Abstracts

The calcium-sensing receptor (CaSR) is the master regulator of calcium homeostasis. This class C G-protein coupled receptor binds extracellular calcium and phosphate, and is the target of calcimimetic and calcilytic drugs. The CaSR is expressed on the cell surface as a homodimer and is most highly expressed in the parathyroid glands and the renal thick ascending limb, where it acts to maintain a near-constancy of plasma calcium concentrations by regulating parathyroid hormone ...

Background: Patients with autosomal dominant hypocalcemia type 1 (ADH1), due to germline gain-of-function calcium-sensing receptor (CASR) mutations, have hypocalcemia and seizures, hyperphosphatemia, hypercalciuria and inappropriately low parathyroid hormone (PTH) concentrations. Treatment for ADH1 comprises calcium and vitamin D analogs, however, their use predisposes to nephrocalcinosis and renal impairment. In contrast, recombinant human PTH(1-34) may incre...