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• W2001713576 abstract "Winter depressions in seasonal affective disorder (SAD) are associated with central serotonergic (5-HT) dysfunction. SAD patients demonstrate rather specific, state-dependent, abnormal increases in 'activation-euphoria' ratings following intravenous infusion of the 5-HT receptor agonist meta-chlorophenylpiperazine (m-CPP). Several studies are also consistent with abnormal serotonergic regulation of the hypothalamic-pituitary-adrenal (HPA) axis in SAD. Here, we investigated the effects of the 5-HT1A receptor partial agonist ipsapirone, which produces behavioral effects and HPA-axis activation, to further characterize the 5-HT receptor subtype-specificity of these disturbances in SAD. Eighteen SAD patients and 18 control subjects completed two drug challenges (ipsapirone 0.3 mg/kg and placebo) separated by 3-5 days in randomized order. We measured behavioral responses with the NIMH self-rating scale, and plasma ACTH, cortisol, and prolactin concentrations. Compared with placebo, ipsapirone was associated with significant increases in self-rated 'functional deficit' and 'altered self-reality', and in each of the hormones. There were no differences between groups on any measures. The level of depression in SAD patients was inversely correlated with their ipsapirone-induced cortisol responses. There were significant drug x order effects on baseline 'anxiety' scores, ACTH and cortisol concentrations, such that subjects were significantly more stressed (higher 'anxiety', ACTH and cortisol) prior to their first challenge compared with their second. In conclusion, post-synaptic 5-HT1A receptors appear to function normally in SAD. The previously observed m-CPP-induced behavioral abnormality may be mediated by either 5-HT2C or 5-HT7 receptors." @default.
• W2001713576 created "2016-06-24" @default.
• W2001713576 creator A5005056353 @default.
• W2001713576 creator A5006832486 @default.
• W2001713576 creator A5026475727 @default.
• W2001713576 creator A5027281573 @default.
• W2001713576 creator A5040158309 @default.
• W2001713576 creator A5063256213 @default.
• W2001713576 creator A5063416939 @default.
• W2001713576 creator A5083458677 @default.
• W2001713576 date "1999-04-01" @default.
• W2001713576 modified "2023-10-01" @default.
• W2001713576 title "Serotonin hypothesis of winter depression: behavioral and neuroendocrine effects of the 5-HT1A receptor partial agonist ipsapirone in patients with seasonal affective disorder and healthy control subjects" @default.
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