Platelet aggregation and thromboxane A2 production after adrenergic stimulation in young healthy humans

The effects of adrenergic stimulation on platelet aggregation (platelet aggregation ratio; PAR), beta-thromboglobulin (beta-TG) release and plasma thromboxane B2 (TxB2) levels were investigated in 25 healthy young volunteers. Adrenergic stimulation induced by cold application was checked by evaluating the changes in the calculated vascular resistance in the forearm. A prompt increase in platelet aggregates and plasma beta-TG and TxB2 concentrations was observed after adrenergic stimulation. PAR changed from resting values of 0.97 +/- 0.05 to 0.75 +/- 0.08 (p less than 0.001) at the end of cold application. At the same time, beta-TG plasma concentration increased from 32.09 +/- 19.64 to 135.48 +/- 37.97 ng/ml (p less than 0.001) and TxB2 plasma levels changed from 0.49 +/- 0.24 to 0.99 +/- 0.39 pmol/ml (p less than 0.001). TxB2 levels, but not PAR and beta-TG concentration came back to the resting values at the end of the observation period (10 min). Aspirin, as the lysine acetylsalicylate equivalent to 5 mg/kg i.v. of acetylsalicylic acid, although able to completely inhibit platelet cyclooxygenase failed to inhibit the plasma TxB2 increase induced by adrenergic stimulation. This strongly suggests that the increase in plasma TxB2 following adrenergic stimulation is of extraplatelet origin. Also beta-TG and PAR changes were not affected by aspirin administration.