| Bioactivity | NPS-2143 hydrochloride (SB-262470A hydrochloride), an orally active calcilytic agent, is a selective and potent calcium ion-sensing receptor (CaSR) antagonist. NPS-2143 hydrochloride (SB-262470A hydrochloride) blocks increases in cytoplasmic Ca2+ concentrations (IC50=43 nM) elicited by activating the Ca2+ receptor in HEK 293 cells expressing the human Ca2+ receptor[1][2]. |
| Invitro | NPS-2143 hydrochloride (SB-262470A hydrochloride) stimulates parathyroid hormone (PTH) secretion from bovine parathyroid cells with EC50 of 41 nM. Moreover, NPS-2143 hydrochloride also blocks the inhibitory effects of calcimimetic NPS R-467 on PTH secretion from bovine parathyroid cells and the inhibitory effects of extracellular Ca2+ on isoproterenol-stimulated increases in cyclic AMP formation[1]. |
| In Vivo | When infused intravenously in normal rats, NPS-2143 hydrochloride (SB-262470A hydrochloride) causes 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]. |
| Name | NPS-2143 hydrochloride |
| CAS | 324523-20-8 |
| Formula | C24H26Cl2N2O2 |
| Molar Mass | 445.38 |
| Appearance | Solid |
| Transport | Room temperature in continental US; may vary elsewhere. |
| Storage | 4°C, sealed storage, away from moisture *In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture) |
| Reference | [1]. Huang Y, Breitwieser GE. Rescue of calcium-sensing receptor mutants by allosteric modulators reveals a conformational checkpoint in receptor biogenesis. J Biol Chem. 2007 Mar 30;282(13):9517-25 [2]. Marquis, Robert W.; Lago, Amparo M.; Callahan, James F.;Antagonists of the Calcium Receptor. 2. Amino Alcohol-Based Parathyroid Hormone Secretagogues. Journal of Medicinal Chemistry (2009), 52(21), 6599-6605. [3]. Yamamura A, Guo Q, Yamamura H, Zimnicka AM, Pohl NM, Smith KA, Fernandez RA, Zeifman A, Makino A, Dong H, Yuan JX.Enhanced Ca2+-sensing receptor function in idiopathic pulmonary arterial hypertension.Circ Res. 2012 Aug 3;111(4):469-81. Epub 2012 Jun 22. [4]. Nakajima S, Hira T, Hara H.Calcium-sensing receptor mediates dietary peptide-induced CCK secretion in enteroendocrine STC-1 cells.Mol Nutr Food Res. 2012 May;56(5):753-60. [5]. Davey AE, Leach K, Valant C, Conigrave AD, Sexton PM, Christopoulos A.Positive and negative allosteric modulators promote biased signaling at the calcium-sensing receptor.Endocrinology. 2012 Mar;153(3):1232-41. Epub 2011 Dec 30. [6]. 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. |
NPS-2143 hydrochloride
CAS: 324523-20-8 F: C24H26Cl2N2O2 W: 445.38
NPS-2143 hydrochloride (SB-262470A hydrochloride), an orally active calcilytic agent, is a selective and potent calcium
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