The platelet P2Y12 receptor (P2Y12R) for adenosine 5'diphosphate (ADP) plays a central role in platelet function, hemostasis, and thrombosis [3].Prasugrel (PCR 4099), a thienopyridine and prodrug, inhibits platelet function. Prasugrel is an orally active and potent P2Y12 receptor antagonist, and inhibits ADP-induced platelet aggregation. Prasugrel acts faster and is significantly more potent than Clopidogrel in vivo. Prasugrel is an inactive prodrug that requires metabolic processing in vivo to generate the active antiplatelet metabolite. Prasugrel is rapidly absorbed from the gut. After oral administration of standard-loading doses of 60 mg, maximum plasma levels of the active metabolite are achieved within 1 h, effective, maximum inhibition of platelet aggregation at 1-2h [4]. Oral administration of prasugrel to rats resulted in dose-related and time-related inhibition of ex vivo platelet aggregation, and its effect was about 10 times more potent than that of clopidogrel. In rat platelets, prasugrel AM inhibited in vitro platelet aggregation induced by adenosine 5'-diphosphate (ADP) (10 microm) with an IC(50) value of 1.8 microm[5]. Post-administration of prasugrel for 3 and 5 days reduced neurological deficit scores and improved the spontaneous activity/short term spatial memory using the Y-maze paradigm. On the molecular level, prasugrel turned off SUMO2/3-inhibitory kappa (Iκ)Bα, Ubc9 and nuclear factor kappa (NF-κ)B. Besides, it inhibited malondialdehyde (MDA) and inactivated astrocytes by downregulating the glial fibrillary acidic protein (GFAP) hippocampal immune-expression[6].
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