NPS-2143

• CAT Number: I002966
• CAS Number: 284035-33-2
• Molecular Formula: C24H25ClN2O2
• Molecular Weight: 408.93
• Purity: ≥95%
• Synonyms: 2-chloro-6-[(2R)-2-hydroxy-3-[(2-methyl-1-naphthalen-2-ylpropan-2-yl)amino]propoxy]benzonitrile
• Target: CaSR
• Solubility: DMSO ≥80mg/mL Water <1.2mg/mL Ethanol <1.2mg/mL
• Storage: 3 years -20C powder
• IC50: 43 nM(for Ca2+ receptor) [1]

NPS-2143(SB 262470A ) is a selective potent calcium ion-sensing receptor antagonist with IC50 of 43 and 41 nM for cytoplasmic Ca2+ concentrations and parathyroid hormone secretion, respectively.IC50 value: 43 nM(for Ca2+ receptor) [1]Target: CaSRin vitro: NPS 2143, even when tested at much higher concentrations (3 microM), did not affect the activity of a number of other G protein-coupled receptors, including those most structurally homologous to the Ca2+ receptor. NPS 2143 stimulated parathyroid hormone (PTH) secretion from bovine parathyroid cells (EC50 of 41 nM) over a range of extracellular Ca2+ concentrations and reversed the effects of the calcimimetic compound NPS R-467 on [Ca2+]i and on secretion of PTH [1]. The first reported calcilytic compound was NPS 2143, an orally active molecule which elicits rapid, 3- to 4-fold increases in circulating levels of PTH [2].in vivo: When infused intravenously in normal rats, NPS 2143 caused a rapid and large increase in plasma levels of PTH. Ca2+ receptor antagonists are termed calcilytics and NPS 2143 is the first substance (either atomic or molecular) shown to possess such activity [1]. When administered together with an antiresorptive agent (estradiol), NPS 2143 causes an increase in trabecular bone volume and bone mineral density in osteopenic rats [2].

Reference

[1]. Nemeth EF, et al. Calcilytic compounds: potent and selective Ca2+ receptor antagonists that stimulate secretion of parathyroid hormone. J Pharmacol Exp Ther. 2001 Oct;299(1):323-31.
[2]. Nemeth EF. The search for calcium receptor antagonists (calcilytics). J Mol Endocrinol. 2002 Aug;29(1):15-21.