title: Relationship between the antithrombotic effect of YM-75466, a novel factor Xa inhibitor, and coagulation parameters in rats.
abstract: The relationship between the antithrombotic effects of intravenous infusions of YM-75466 [N-[4-[(1-acetimidoyl-4-piperidyl)oxy]phenyl]-N-[(7-amidino-2-naph thyl)methyl] sulfamoyl]acetic acid monomethanesulfonate), a novel factor Xa (FXa) inhibitor, and various coagulation parameters (prothrombin time, activated partial thromboplastin time, thrombin-antithrombin III complex (TAT), anti-FXa activity and anti-thrombin activity) in rats was studied and compared with results for heparin. In the arterio-venous shunt model, both agents exerted antithrombotic effects in a dose-dependent manner. Coagulation parameters were studied simultaneously with antithrombotic effects. YM-75466 did not prolong coagulation time even at the dose which exerted significant antithrombotic effects, while it decreased TAT level in plasma in a dose-dependent manner. YM-75466 exerted anti-FXa activity but not anti-thrombin activity. In contrast, heparin prolonged activated partial thromboplastin time in a dose-dependent manner and decreased TAT level in plasma with increasing inhibition of thrombus formation. Heparin exerted both anti-FXa and anti-thrombin activity in a dose-dependent manner. These results suggest that TAT is a suitable parameter for monitoring the antithrombotic effect of YM-75466 in the arterio-venous shunt model in rats and that YM-75466, unlike heparin, exerts its antithrombotic effect through specific inhibition of FXa without any effect on thrombin.
authors.affiliation: Institute for Drug Discovery Research, Yamanouchi Pharmaceutical, Tsukuba, Ibaraki, Japan. satoh_k@yamanouchi.co.jp
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: Y
authors.initials: Y
authors.lastname: Taniuchi
authors.forename: T
authors.initials: T
authors.lastname: Kawasaki
authors.forename: F
authors.initials: F
authors.lastname: Hirayama
authors.forename: H
authors.initials: H
authors.lastname: Koshio
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
mesh_terms: D000818:Animals; D000990:Antithrombin III / Q000378:metabolism; D001166:Arteriovenous Shunt, Surgical; D001777:Blood Coagulation / Q000187:drug effects*; D015951:Factor Xa / Q000378:metabolism; D065427:Factor Xa Inhibitors; D005343:Fibrinolytic Agents / Q000494:pharmacology*; D006493:Heparin / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D010447:Peptide Hydrolases / Q000378:metabolism; D010880:Piperidines / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013449:Sulfonamides / Q000494:pharmacology*
chemical_list: D065427:Factor Xa Inhibitors; D005343:Fibrinolytic Agents; D010880:Piperidines; D013449:Sulfonamides; C114145:YM 75466; C046193:antithrombin III-protease complex; D000990:Antithrombin III; D006493:Heparin; D010447:Peptide Hydrolases; D015951:Factor Xa