Atopaxar_product_DataBase

Bioactivity

Atopaxar (E5555) is a potent, orally active, selective and reversible thrombin receptor protease-activated receptor-1 (PAR-1) antagonist. Atopaxar, an antiplatelet agent, interferes with platelet signaling. Atopaxar can be used for the research of atherothrombotic disease[1][2].

Target

PAR-1

Invitro

Atopaxar (0.0001-10 μM; 1h) inhibits haTRAP (high-affinity thrombin receptor activating peptide) binding to PAR-1 on human platelet membranes in a concentration-dependent manner, with an IC50 of 0.019 μM[2].Atopaxar inhibits human platelet aggregation induced by thrombin or TRAP in a concentration-dependent manner[2].Atopaxar does not inhibit PRP (platelet-rich plasma) aggregation induced by ADP, U46619, collagen, and PAR-4ap, up to a concentration of 20 μM[2].

In Vivo

Atopaxar (30-100 mg/kg; p.o.) causes a dose-dependent prolongation of the time to occlusion of the femoral artery in photochemically-induced thrombosis (PIT) guinea pigs model[2]. Atopaxar does not prolong bleeding time in guinea pigs at the highest tested dosage of 1000 mg/kg[2]. Animal Model:

Name

Atopaxar

CAS

751475-53-3

Formula

C29H38FN3O5

Molar Mass

527.63

Appearance

Solid

Transport

Room temperature in continental US; may vary elsewhere.

Storage

Powder	-20°C	3 years
	4°C	2 years
In solvent	-80°C	6 months
	-20°C	1 month

Reference

[1]. Chris Dockendorff, et al. Discovery of 1,3-Diaminobenzenes as Selective Inhibitors of Platelet Activation at the PAR1 Receptor. ACS Med Chem Lett. 2012 Mar 8; 3(3): 232–237. [2]. Motoji Kogushi, et al. The novel and orally active thrombin receptor antagonist E5555 (Atopaxar) inhibits arterial thrombosis without affecting bleeding time in guinea pigs. Eur J Pharmacol. 2011 Apr 25;657(1-3):131-7.

PeptideDB

Atopaxar

CAS: 751475-53-3 F: C29H38FN3O5 W: 527.63