SQ22536 is an inhibitor of adenylyl cyclase with an IC50 of 1.4 M. It can inhibit PGE1-stimulated increases in cAMP levels in intact human platelets.SQ22536(250 mol/L) attenuates the inhibitory effect of adenosine against ADP-induced platelet aggregation from 85 to 575%, respectively (p<0.001). SQ22536 also attenuates an increase of intraplatelet levels of cAMP by adenosine from 292 to 91 pmol/108 platelets (p<0.05). It has no effect on the platelet antiaggregant activity of inosine (1 to 4 mmol/L) and ADP-induced platelet aggregation
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