Prostaglandin E 1 Inhibits Platelet Aggregation by a Pathway Independent of Adenosine 3′,5′-Monophosphate

Abstract
Aggregation of human blood platelets induced by adenosine diphosphate or l -epinephrine was inhibited when the platelets were suspended in plasma which had been previously exposed to an insolubilized ω-aminohexylagarose derivative of prostaglandin E 1 . This decrease of platelet aggregation was not accompanied by a change in the concentration of adenosine 3′,5′-monophosphate (cyclic AMP) in platelets. The results demonstrate the existence of an alternative pathway independent of cyclic AMP for the inhibition of platelet aggregation by plasma.