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Clot-Targeted Antithrombotics for Venous Thromboprophylaxis

用于预防静脉血栓的凝块靶向抗血栓药物

基本信息

批准号：
10474980
负责人：
Elliot Chaikof
金额：
$ 46.58万
依托单位：
BETH ISRAEL DEACONESS MEDICAL CENTER
依托单位国家：
美国
项目类别：
财政年份：
2019
资助国家：
美国
起止时间：
2019-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10474980
关键词：
Antibodies Anticoagulants Antiplatelet Drugs Automobile Driving Biological Products Blood Platelets Charge Clinical Coagulation Process Complex Development Effectiveness Event Fibrin Fibrinolytic Agents Fibrosis Generations HMGB1 gene Hemorrhage Hemostatic Agents Hospital Mortality Hospitals Human Hybrids Immune response In Vitro Inflammatory Response Leukocytes Maintenance Maps Molecular Conformation Morbidity - disease rate Pathway interactions Peptides Peripheral Blood Mononuclear Cell Platelet Activation Play Population Postphlebitic Syndrome Process Production Property Proteins Recombinants Resolution Risk Role Site Surface T-Lymphocyte Epitopes Therapeutic Thrombin Thrombosis Thrombus Ticks Transgenic Mice Urokinase Variant Veins Venous Venous Thrombosis base computerized tools de-immunization design effective therapy experimental study immunogenic immunogenicity in vivo lead candidate mouse model neutrophil pharmacokinetics and pharmacodynamics prevent response venous thromboembolism

项目摘要

Project Summary We currently lack effective therapies that reduce the risk of venous thromboembolism without an attendant risk of bleeding. The assembled investigative team has recently identified single chain antibodies that selectively block activated platelets and enrich therapeutics at the site of a developing thrombus. In the process, we have discovered that selective targeting of activated platelets allows a wide variety of antithrombotic agents to be efficacious, well below systemic concentrations that cause bleeding. In this proposal, we postulate that selective targeting to activated platelets provides a means to locally concentrate antiplatelet, anticoagulant, and fibrinolytic agents at the site of a growing venous thrombus without disrupting essential hemostatic processes. We believe that this strategy will enable the design of high potency agents for venous thromboprophylaxis, but without an increased risk of major bleeding. In this proposal, we intend to: (1) Define the ability of clot-targeted “dual pathway” antithrombotics to prevent venous thrombosis and inhibit postthrombotic vein wall fibrosis without hemostatic disturbance. The efficacy of “dual pathway” antithrombotics based on SCE5-TAP, a single chain antibody with both antiplatelet and anticoagulant activity will be defined using murine models of venous thrombosis. These studies will evaluate the capacity of SCE5-TAP and related new variants to prevent venous thrombosis, limit early and late inflammatory responses, and inhibit thrombus-induced remodeling of the vein wall without hemostatic disturbance. (2) Determine the capacity of clot-targeted antithrombotics that display anti-platelet and fibrinolytic activity to inhibit venous thrombosis and postthrombotic vein wall remodeling. The effectiveness of antithrombotics based on SCE5-scuPA, a single chain antibody with both antiplatelet and fibrinolytic activity will be defined using murine models of venous thrombosis alone or in combination with SCE5-TAP or related new variants. We will also design recombinant clot-targeted hybrid constructs (SCE5-TAP-scuPA) that display antiplatelet, anticoagulant, and fibrinolytic activity. The ability of these agents to inhibit thrombosis, promote thrombus resolution, and limit the development of vein wall fibrosis will be defined. (3) Mitigate the immune response to clot-targeted antithrombotics with the design of functionally deimmunized TAP variants through deletion of immunogenic T cell epitopes. The cellular immunogenicity of TAP (tick anticoagulant peptide) will be assessed and T cell epitopes, which drive the response mapped in naïve human peripheral blood mononuclear cells. Computational tools will be used to design functionally deimmunized TAP variants that will be evaluated in vitro and ex vivo for their maintenance of FXa inhibitory activity and their reduction of cellular immunogenicity. The wild type and resulting lead candidate will be assessed for cellular and humoral immunogenicity in vivo in humanized HLA transgenic mice. The successful deimmunization of TAP will allow us to generate deimmunized clot-targeted antithrombotics.

项目总结