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Discovery and clinical evaluation of 1-{N-[2-(amidinoaminooxy)ethyl]amino}carbonylmethyl-6-methyl-3-[2,2-difluoro-2-phenylethylamino]pyrazinone (RWJ-671818), a thrombin inhibitor with an oxyguanidine P1 motif.

Author(s): Lu T, Markotan T, Ballentine SK, Giardino EC, Spurlino J, Crysler CS, Brown K, Maryanoff BE, Tomczuk BE, Damiano BP, Shukla U, End D, Andrade-Gordon P, Bone RF, Player MR

Affiliation(s): Johnson & Johnson Pharmaceutical Research and Development, Welsh and McKean Roads, Spring House, Pennsylvania 19477-0776, USA.

Publication date & source: 2010-02-25, J Med Chem., 53(4):1843-56.

Publication type: In Vitro; Randomized Controlled Trial

We have identified RWJ-671818 (8) as a novel, low molecular weight, orally active inhibitor of human alpha-thrombin (K(i) = 1.3 nM) that is potentially useful for the acute and chronic treatment of venous and arterial thrombosis. In a rat deep venous thrombosis model used to assess antithrombotic efficacy, oral administration of 8 at 30 and 50 mg/kg reduced thrombus weight by 87 and 94%, respectively. In an anesthetized rat antithrombotic model, where electrical stimulation of the carotid artery created a thrombus, 8 prolonged occlusion time 2- and 3-fold at 0.1 and 1.0 mg/kg, i.v., respectively, and more than doubled activated clotting time and activated partial thromboplastin time at the higher dose. This compound had excellent oral bioavailability of 100% in dogs with an estimated half-life of approximately 3 h. On the basis of its noteworthy preclinical data, 8 was advanced into human clinical trials and successfully progressed through phase 1 studies.

Page last updated: 2010-10-05

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