Binding of [H-3]paroxetine to serotonin uptake sites and of [H-3]lysergic acid diethylamide to 5-HT2A receptors in platelets from women with premenstrual dysphoric disorder during gonadotropin releasing hormone treatment

Changes in serotonergic parameters have been reported in psychiatric condit ions such as depression but also in the premenstrual dysphoric disorder (PM DD). In addition, hormonal effects on serotonergic activity have been estab lished. In the present;study, binding of [H-3]paroxetine to platelet seroto nin uptake sites: and binding of [H-3]lysergic acid diethylamide ([H-3]LSD) to platelet serotonin (5-HT)(2A) receptors were studied in patients with P MDD treated with a low dose of a gonadotropin releasing hormone (GnRH) agon ist (buserelin) or placebo and compared to controls. The PMDD patients were relieved of premenstrual symptoms like depression and irritability during buserelin treatment. The number of [H-3]paroxetine binding sites (B-max) we re significantly higher in the follicular phase in untreated PMDD patients compared to controls. When treated with buserelin the difference disappeare d. No differences in [ H-3]LSD binding between the three groups were shown. The present study demonstrated altered platelet [3H]paroxetine binding cha racteristics in women with PMDD compared to controls. Furthermore, [H-3]par oxetine binding was affected by PMDD treatment with a low dose of buserelin . The results are consistent with the hypothesis that changes in serotonerg ic transmission could be a trait in the premenstrual dysphoric disorder. (C ) 2001 Elsevier Science Ltd. All rights reserved.