SCH79797 dihydrochloride 

SCH79797 dihydrochloride is a highly potent, selective nonpeptide protease activated receptor 1 (PAR1) antagonist. SCH79797 dihydrochloride inhibits binding of a high-affinity thrombin receptor-activating peptide to PAR1 with an IC₅₀ of 70 nM and a K_i of 35 nM. SCH79797 dihydrochloride inhibits thrombin-induced platelet aggregation with an IC₅₀ of 3 μM. SCH79797 dihydrochloride has antiproliferative and pro-apoptotic effects, and limits myocardial ischemia/reperfusion injury in rat hearts. SCH79797 dihydrochloride also potently prevents PAR1 activation in vascular smooth muscle cells, endothelial cells, and astrocytes^[1][2][3][4].

Protease activated receptor 1 (PAR1)^[1]; Apoptosis^[3]

SCH79797 inhibits high-affinity thrombin receptor-activating peptide ([³H]haTRAP) binding in a competitive manner. SCH79797 inhibits α-thrombin- and haTRAP-induced aggregation of human platelets, but does not inhibit human platelet aggregation induced by the tethered ligand agonist for protease-activated receptor-4 (PAR-4), γ-thrombin, ADP, or collagen. Thrombin produces transient increases in cytosolic free Ca²⁺ concentration ([Ca²⁺]_i) in hCASMC. SCH79797 effectively inhibits this increase in [Ca²⁺]_i. SCH79797 completely inhibits Thrombin- and TK-stimulated [³H]thymidine incorporation ^[1].
SCH79797 is able to interfere with the growth of several human and mouse cell lines, in a concentration-dependent manner. The ED₅₀ for growth inhibition iss 75 nM, 81 nM and 116 nM for NIH 3T3, HEK 293 and A375 cells, respectively. In NIH 3T3 cells, SCH79797 inhibits serum-stimulated activation of p44/p42 mitogen-activated protein kinases (MAPK) at low concentrations and induces apoptosis at higher concentrations^[2].

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

SCH79797 (2.5-250 μg/kg; intravenous injection; male Sprague Dawley rats) treatment immediately before or during ischemia reduces myocardial necrosis following I/R in the intact rat heart in two rat models of myocardial ischemia/reperfusion (I/R) injury. This response is dose-dependent with the optimal dose being 25 μg/kg^[4].

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

444.40

Solid

C₂₃H₂₇Cl₂N₅

1216720-69-2

Cl[H].Cl[H].NC1=NC(NC2CC2)=NC3=CC=C(N(CC4=CC=C(C(C)C)C=C4)C=C5)C5=C31

Room temperature in continental US; may vary elsewhere.

4°C, sealed storage, away from moisture

*In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture)

• [1]. Ahn HS, et al. Inhibition of cellular action of thrombin by N3-cyclopropyl-7-[[4-(1-methylethyl)phenyl]methyl]-7H-pyrrolo[3, 2-f]quinazoline-1,3-diamine (SCH 79797), a nonpeptide thrombin receptor antagonist. Biochem Pharmacol. 2000 Nov 15;60(10):1425-34.  [Content Brief]

  [2]. Di Serio C, et al. Protease-activated receptor 1-selective antagonist SCH79797 inhibits cell proliferation and induces apoptosis by a protease-activated receptor 1-independent mechanism. Basic Clin Pharmacol Toxicol. 2007 Jul;101(1):63-9.  [Content Brief]

  [3]. Sokolova E, et al. A novel therapeutic target in various lung diseases: airway proteases and protease-activated receptors. Pharmacol Ther. 2007 Jul;115(1):70-83.  [Content Brief]

  [4]. Strande JL, et al. SCH 79797, a selective PAR1 antagonist, limits myocardial ischemia/reperfusion injury in rat hearts. Basic Res Cardiol. 2007 Jul;102(4):350-8.  [Content Brief]