BQ-123 TFA 

BQ-123 TFA is a potent and selective endothelin A (ETA) receptor antagonist with an IC₅₀ of 7.3 nM and a K_i of 25 nM. BQ-123 TFA inhibits endothelin-1-mediated proliferation of human pulmonary artery smooth muscle cells and lowers blood pressure in different rat models of hypertension^[1][2][3].

IC50: 7.3 nM (Endothelin A receptors)^[1]
Ki: 25 nM (Endothelin A receptors)^[2]

Sustained infusions of BQ-123 (0.16-164 nmol/kg per min, intravenously, for 6 h) produces dose-dependent reductions in mean arterial pressure in spontaneously hypertensive rats (SHR), the maximal reduction being obtained with a dose of 16 nmol/kg per min^[4].
BQ-123 (3 mg/kg; i.v.; given 15 minutes before pentylenetetrazole (PTZ)) impedes the formation and spread of seizure to a great degree in PTZ (50 mg/kg; i.p.) +BQ-123 groups^[5].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

724.72

C₃₃H₄₃F₃N₆O₉

O=C(N[C@](C(N(CCC1)[C@]1([H])C2=O)=O)([H])CC(O)=O)[C@H](NC([C@@H](NC([C@H](N2)C(C)C)=O)CC(C)C)=O)CC3=CNC4=CC=CC=C34.OC(C(F)(F)F)=O

Room temperature in continental US; may vary elsewhere.

Please store the product under the recommended conditions in the Certificate of Analysis.

• [1]. Ihara M, et al. In vitro biological profile of a highly potent novel endothelin (ET) antagonist BQ-123 selective for the ETA receptor. J Cardiovasc Pharmacol. 1992;20 Suppl 12:S11-S14.  [Content Brief]

  [2]. Sakamoto A, et al. Distinct subdomains of human endothelin receptors determine their selectivity to endothelinA-selective antagonist and endothelinB-selective agonists. J Biol Chem. 1993 Apr 25;268(12):8547-53.  [Content Brief]

  [3]. Zamora MA, et al. BQ123, an ETA receptor antagonist, inhibits endothelin-1-mediated proliferation of human pulmonary artery smooth muscle cells. Am J Respir Cell Mol Biol. 1993;9(4):429-433.  [Content Brief]

  [4]. Douglas SA, et al. BQ-123, a selective endothelin subtype A-receptor antagonist, lowers blood pressure in different rat models of hypertension. J Hypertens. 1994;12(5):561-567.  [Content Brief]

  [5]. Erdogan H et al. The protective effects of endothelin-A receptor antagonist BQ-123 in pentylenetetrazole-induced seizure in rats. Hum Exp Toxicol, 2014 Oct, 33(10):1008-16.  [Content Brief]