Platelet alpha 2-adrenoceptor binding and function during the menstrual cycle.

Blood platelet receptors are widely used as peripheral models of central nervous system receptors, particularly in attempts to understand the biological basis of a number of neurological and psychiatric disorders. It is important to differentiate factors other than the primary disease process which may influence platelet receptors. One such potential factor is the menstrual cycle. In this study we have determined platelet high-affinity alpha 2-adrenoceptor binding, using the agonist ligand 3H-UK-14,304 and platelet aggregatory responses to adrenaline in 14 healthy young women, sampled on four occasions at weekly intervals. Our results indicate that, within the limits of individual variation, neither the KD or Bmax of high-affinity 3H-UK-14,304 binding or the aggregatory responses to adrenaline differed significantly between various stages of the menstrual cycle.