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  • Title: Design, synthesis, and biological evaluation of peptidomimetic inhibitors of factor XIa as novel anticoagulants.
    Author: Lin J, Deng H, Jin L, Pandey P, Quinn J, Cantin S, Rynkiewicz MJ, Gorga JC, Bibbins F, Celatka CA, Nagafuji P, Bannister TD, Meyers HV, Babine RE, Hayward NJ, Weaver D, Benjamin H, Stassen F, Abdel-Meguid SS, Strickler JE.
    Journal: J Med Chem; 2006 Dec 28; 49(26):7781-91. PubMed ID: 17181160.
    Abstract:
    Human coagulation factor XIa (FXIa), a serine protease activated by site-specific cleavage of factor XI by thrombin, FXIIa, or autoactivation, is a critical enzyme in the amplification phase of the coagulation cascade. To investigate the potential of FXIa inhibitors as safe anticoagulants, a series of potent, selective peptidomimetic inhibitors of FXIa were designed and synthesized. Some of these inhibitors showed low nanomolar FXIa inhibitory activity with >1000-fold FXa selectivity and >100-fold thrombin selectivity. The X-ray structure of one of these inhibitors, 36, demonstrates its unique binding interactions with FXIa. Compound 32 caused a doubling of the activated partial thromboplastin time in human plasma at 2.4 microM and was efficacious in a rat model of venous thrombosis. These data suggest that factor XIa plays a significant role in venous thrombosis and may be a suitable target for the development of antithrombotic therapy.
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