Gender-specific aging effects on the serotonin 1A receptor

The effects of age on serotonergic function have been hypothesized to under lie age-related changes in mood and behaviors such as sleep and eating. Of particular interest is the serotonin type-1A (5-HT1A) receptor, due to its putative role in mediating the therapeutic efficacy of antidepressant treat ment. Using positron emission tomography (PET) and [C-11-carbonyl] WAY10063 5, we assessed 5-HT1A receptor binding in 21 healthy subjects (10 men, 11 w omen) ranging in age from 21 to 80 years. Regional binding potential values were generated using a reference tissue model and corrected for partial vo lume effects. We observed an inverse relationship between age and binding o f [C-11-carbonyl] WAY100635 to the 5-HT1A receptor in men, but not women. T his finding is in accord with observations reported in the postmortem liter ature. Gender-specific effects of age on central serotonergic function may relate to differences between men and women in behavior, mood, and suscepti bility to neuropsychiatric disease across the adult lifespan. (C) 2001 Else vier Science B.V. All rights reserved.