Abstract
Osthole, isolated from Chinese herb Angelica pubescens, inhibited platelet aggregation and ATP release induced by ADP, arachidonic acid, PAF, collagen, ionophore A23187 and thrombin in washed rabbit platelets. It showed a weak activity in platelet-rich plasma. Osthole inhibited the thromboxane B2 formation caused by arachidonic acid, collagen, ionophore A23187 and thrombin in washed platelets, and also the thromboxane B2 formation caused by the incubation of lysed platelet homogenate with arachidonic acid. The generation of inositol phosphates in washed platelets caused by collagen, PAF and thrombin was suppressed by osthole. These data indicate that the inhibitory effect of osthole on platelet aggregation and release reaction was due to the inhibition of thromboxane formation and phosphoinositides breakdown.
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