
is a selective potent calcium ion-sensing receptor antagonist with IC50 of 43 and Ca2+ concentrations and parathyroid hormone secretion, respectively. NPS-2143 in cytoplasmic Ca2+ concentrations elicited by human Ca2+ receptors expressed in 2143 , even at much higher concentrations (3 μM), did not influence the activity of a number protein-coupled receptors, including those most structurally homologous to the Ca2+