Thrombin-induced oxygen consumption, malonyldialdehyde formation and serotonin secretion in human platelets

The relationship of a thrombin-induced burst in O2 consumption to lipid peroxidation in washed human platelets was investigated by measuring malonyldialdehyde, a by-product of endoperoxide degradation in platelets. The ratio of O2 consumed by malonyldialdehyde produced was approximately 7:1. Acetylsalicylate blocked the formation of malonyldialdehyde completely and partially inhibited the O2 burst induced by thrombin. 5,8,11,14-Eicosatetraynoic acid inhibited the O2 burst as well as the malonyldialdehyde formation completely. The release of [14C]serotonin was not affected by either inhibitor.