RESUMEN
Platelet P2Y12 receptors play a central role in the regulation of platelet function and inhibition of this receptor by treatment with drugs such as clopidogrel results in a reduction of atherothrombotic events. We discovered that modification of natural and synthetic dinucleoside polyphosphates and nucleotides with lipophilic substituents on the ribose and base conferred P2Y12 receptor antagonist properties to these molecules producing potent inhibitors of ADP-mediated platelet aggregation. We describe methods for the preparation of these functionalized dinucleoside polyphosphates and nucleotides and report their associated activities. By analysis of these results and by deconstruction of the necessary structural elements through selected syntheses, we prepared a series of highly functionalized nucleotides, resulting in the selection of an adenosine monophosphate derivative (62) for further clinical development.
Asunto(s)
Plaquetas/metabolismo , Proteínas de la Membrana/antagonistas & inhibidores , Nucleótidos/síntesis química , Inhibidores de Agregación Plaquetaria/síntesis química , Antagonistas del Receptor Purinérgico P2 , Adenosina Monofosfato/análogos & derivados , Adenosina Monofosfato/síntesis química , Adenosina Monofosfato/química , Adenosina Monofosfato/farmacología , Calcio/metabolismo , Línea Celular Tumoral , Fosfatos de Dinucleósidos/síntesis química , Fosfatos de Dinucleósidos/química , Fosfatos de Dinucleósidos/farmacología , Humanos , Técnicas In Vitro , Nucleótidos/química , Nucleótidos/farmacología , Agregación Plaquetaria/efectos de los fármacos , Inhibidores de Agregación Plaquetaria/química , Inhibidores de Agregación Plaquetaria/farmacología , Receptores Purinérgicos P2Y12 , Relación Estructura-ActividadRESUMEN
Dinucleoside polyphosphates act as agonists on purinergic P2Y receptors to mediate a variety of cellular processes. Symmetrical, naturally occurring purine dinucleotides are found in most living cells and their actions are generally known. Unsymmetrical purine dinucleotides and all pyrimidine containing dinucleotides, however, are not as common and therefore their actions are not well understood. To carry out a thorough examination of the activities and specificities of these dinucleotides, a robust method of synthesis was developed to allow manipulation of either nucleoside of the dinucleotide as well as the phosphate chain lengths. Adenosine containing dinucleotides exhibit some level of activity on P2Y(1) while uridine containing dinucleotides have some level of agonist response on P2Y(2) and P2Y(6). The length of the linking phosphate chain determines a different specificity; diphosphates are most accurately mimicked by dinucleoside triphosphates and triphosphates most resemble dinucleoside tetraphosphates. The pharmacological activities and relative metabolic stabilities of these dinucleotides are reported with their potential therapeutic applications being discussed.
