Factor VIIa Inhibitors: Chemical Optimization, Preclinical Pharmacokinetics, Pharmacodynamics, and Efficacy in a Baboon Thrombosis Model
[FA7_HUMAN] Defects in F7 are the cause of factor VII deficiency (FA7D) [MIM:227500]. A hemorrhagic disease with variable presentation. The clinical picture can be very severe, with the early occurrence of intracerebral hemorrhages or repeated hemarthroses, or, in contrast, moderate with cutaneous-mucosal hemorrhages (epistaxis, menorrhagia) or hemorrhages provoked by a surgical intervention. Finally, numerous subjects are completely asymptomatic despite very low factor VII levels.                       
[FA7_HUMAN] Initiates the extrinsic pathway of blood coagulation. Serine protease that circulates in the blood in a zymogen form. Factor VII is converted to factor VIIa by factor Xa, factor XIIa, factor IXa, or thrombin by minor proteolysis. In the presence of tissue factor and calcium ions, factor VIIa then converts factor X to factor Xa by limited proteolysis. Factor VIIa will also convert factor IX to factor IXa in the presence of tissue factor and calcium. [TF_HUMAN] Initiates blood coagulation by forming a complex with circulating factor VII or VIIa. The [TF:VIIa] complex activates factors IX or X by specific limited protolysis. TF plays a role in normal hemostasis by initiating the cell-surface assembly and propagation of the coagulation protease cascade.
Publication Abstract from PubMed
Highly selective and potent factor VIIa-tissue factor (fVIIa.TF) complex inhibitors were generated through structure-based design. The pharmacokinetic properties of an optimized analog (9) were characterized in several preclinical species, demonstrating pharmacokinetic characteristics suitable for once-a-day dosing in humans. Analog 9 inhibited platelet and fibrin deposition in a dose-dependent manner after intravenous administration in a baboon thrombosis model, and a pharmacodynamic concentration-response model was developed to describe the platelet deposition data. Results for heparin and enoxaparin (Lovenox) in the baboon model are also presented.
Factor VIIa inhibitors: chemical optimization, preclinical pharmacokinetics, pharmacodynamics, and efficacy in an arterial baboon thrombosis model.,Young WB, Mordenti J, Torkelson S, Shrader WD, Kolesnikov A, Rai R, Liu L, Hu H, Leahy EM, Green MJ, Sprengeler PA, Katz BA, Yu C, Janc JW, Elrod KC, Marzec UM, Hanson SR Bioorg Med Chem Lett. 2006 Apr 1;16(7):2037-41. Epub 2006 Jan 18. PMID:16412633
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.