The novel P2Y 12 antagonist AZD6140 rapidly and reversibly reduces platelet activation in diabetic rats.
BACKGROUND
Excessive platelet activation fundamentally contributes to cardiovascular events and mortality in patients with diabetes mellitus. Functional resistance has been described for current antiplatelet therapies in broad populations that include patients with diabetes. We investigated acute and chronic effects of AZD6140, a reversible oral rapid-onset P2Y(12) antagonist, on platelet reactivity in diabetic rats.


METHODS
Diabetes was induced by streptozotocin injection in male Wistar rats. After 4 weeks, AZD6140 was administered (5mg/kg by gavage) and achieved sufficient plasma levels within 30 minutes. Platelet reactivity was determined by ADP-induced P-selectin expression, aggregation and adhesion on fibrinogen coated membranes under arterial flow conditions.


RESULTS
At 0.5 hour, AZD6140 strongly reduced ADP-induced P-selectin surface expression, inhibited ADP-induced platelet aggregation, and significantly reduced platelet adhesion to fibrinogen under arterial flow conditions. Chronic treatment with AZD6140 (10mg/kg bid for 2 weeks, based on data obtained in the acute study) starting at day 14 reduced P-selectin surface expression on circulating platelets, indicating lower in vivo platelet activation. Platelet reactivity was improved 12 hours after the last dose, while basal platelet activity remained reduced. AZD6140 was rapidly absorbed in diabetic rats and inhibited platelet reactivity. Chronic treatment lowered in vivo platelet activation of circulating platelets.


CONCLUSIONS
AZD6140 inhibits platelet reactivity in diabetic rats rapidly and reversibly. Markers of tonic platelet activation, which were increased in diabetic rats, were lowered to levels comparable to non-diabetic rats following chronic treatment with AZD6140.
Medizinische Klinik und Poliklinik I, Universitätsklinikum Würzburg, Julius-Maximilians-Universität Würzburg, Germany.
Ulrike
U
Flierl
Corinna
C
Schöpp
Juliane
J
Jaitner
Johann
J
Bauersachs
Andreas
A
Schäfer
D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D003921:Diabetes Mellitus, Experimental / Q000097:blood* / Q000378:metabolism; D008297:Male; D015539:Platelet Activation / Q000187:drug effects*; D058919:Purinergic P2 Receptor Antagonists; D051381:Rats; D017208:Rats, Wistar; D013311:Streptozocin / Q000494:pharmacology; D000077486:Ticagrelor; D013997:Time Factors; D023382:Toxicity Tests, Acute; D036401:Toxicity Tests, Chronic
D058919:Purinergic P2 Receptor Antagonists; D013311:Streptozocin; D000077486:Ticagrelor; D000241:Adenosine