ABSTRACT
The platelet aggregation is a crucial step in a pathophisiology of thromboses, leading to development of cardio-vascular diseases (myocardial infarction, transient ischemic attacks, strokes, etc.). The final step in the aggregation is the binding of fibrinogen to receptor - glycoprotein IIb/IIIa (GP IIb/IIIa) on the surface of activated platelets. In recent years the increasing attention is paid to the role of fibrinogen antagonists in the prevention of thrombosis. The search for these compounds is based on the molecular design of structures mimicking some fragment of RGD (Arg-Gly-Asp) sequence, responsible for the binding of fibrinogen to GP IIb/IIIa. Up to now, a large number of potent and selective GP IIb/IIIa antagonists, including non-peptide inhibitors are identified (derivatives of benzodiazepines, aminobenzamidinosuccinyles, isoxazolines, isoquinolines). The modification of natural peptide structures for obtaining of more active and selective fibrinogen receptor antagonists is realized in several ways: substitution of main pharmacophores of RGD sequence; cyclization of RGD-containing peptides; design of conformationally constrained peptidomimetics. For the treatment of chronic cardio-vascular diseases, the clinic needs high orally active RGD-peptidomimetics. This task is realized by obtaining of prodrugs on the base of the most potent RGD-mimetics. In our laboratory the molecular design and synthesis of non-peptide fibrinogen receptor antagonists were carried out. The series of RGD-mimetics on the basis of 4-oxo-(piperazine-1-yl)butyric acid as Arg-mimetic and beta-aryl-beta-alanines as Asp-Phe-mimetics were synthesized. Obtained RGD-mimetics showed a high antiaggregatory activity in vitro experiments with IC(50)values of 10(-7) - 10(-9) M.
Subject(s)
Oligopeptides/pharmacology , Platelet Aggregation Inhibitors/pharmacology , Platelet Glycoprotein GPIIb-IIIa Complex/antagonists & inhibitors , Prodrugs , Receptors, Fibrinogen/antagonists & inhibitors , Animals , Biomimetics , Blood Platelets/metabolism , Drug Design , Fibrinogen/metabolism , Humans , Molecular Structure , Oligopeptides/chemistry , Platelet Aggregation Inhibitors/chemistry , Protein Conformation , Structure-Activity RelationshipABSTRACT
The literature data on effective approaches to the development of the novel peptidomimetics, antagonists of fibrinogen GP IIb/IIIa receptors as potential antithrombotic agents are generalized and systematized in the review. The data obtained by the authors on the synthesis and properties of novel peptidomimetics are reported.
