The calcium-sensing receptor (CaSR) is a Class C G-protein coupled receptor which senses extracellular levels of calcium ion. It is primarily expressed in the parathyroid gland and the renal tubules of the kidney.
Calhex 231 hydrochloride is a CaSR inhibitor with the potential for diabetic cardiomyopathy treatment. It blocks Ca2+-induced accumulation of [3H]inositol phosphate (IC50: 0.39 μM in HEK293 cells).