title: Impairment of ADP-induced platelet aggregation by hashish components.
abstract: ADP-induced aggregation of washed human platelets is inhibited by the hashish components delta1-tetrahydrocannabinol (THC) and cannabidiol (CBD). The inhibition is counteracted by added ADP. When the cannabinoids are present at concentrations higher than 10(-5)M, the platelets aggregate non-reversibly, independently of an added inducer, apparently due to lysis and release of endogenous inducers. THC is clearly more potent than CBD in exhibiting the biphasic effect. Collagen- and thrombin-induced aggregation of washed platelets are hardly affected by the cannabinoids. THC and CBD also curtail ADP-induced reversible aggregation in platelet-rich plasma, while serotonin release and irreversible aggregation, caused by either ADP, collagen or thrombin, are not affected by the cannabinoids in platelet-rich plasma. The data point to associated sites for ADP and the cannabinoids on the platelet membrane.
mesh_terms: D000244:Adenosine Diphosphate / Q000037:antagonists & inhibitors*; D002185:Cannabidiol / Q000494:pharmacology; D002186:Cannabinoids / Q000494:pharmacology*; D013759:Dronabinol / Q000494:pharmacology; D006801:Humans; D010974:Platelet Aggregation / Q000187:drug effects*
chemical_list: D002186:Cannabinoids; D002185:Cannabidiol; D000244:Adenosine Diphosphate; D013759:Dronabinol