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  • Title: Abnormal serotonergic control of prolactin and cortisol secretion in patients with seasonal affective disorder.
    Author: Coiro V, Volpi R, Marchesi C, De Ferri A, Davoli C, Caffarra P, Rossi G, Caffarri G, Davolio M, Chiodera P.
    Journal: Psychoneuroendocrinology; 1993; 18(8):551-6. PubMed ID: 8127946.
    Abstract:
    The effects of the serotonergic agent d,l-fenfluramine (60 mg PO) or a placebo on serum prolactin (PRL) and cortisol levels were evaluated in seven patients (five men and two women) with seasonal affective disorders (SAD) and in eight normal controls (eight men and two women). Both groups were tested in fall/winter when patients with SAD suffered depressive symptoms and in spring/summer, when patients were euthymic. Spring/summer and fall/winter tests gave similar results. PRL and cortisol patterns were similar in all subjects after placebo, whereas both hormonal responses to d,l-fenfluramine were significantly lower in patients with SAD than in normal controls. Correlation studies between the two hormonal responses revealed that on both periods the amplitudes of PRL and cortisol increments were significantly and positively correlated in patients with SAD. These data show diminished serotonergic responsiveness in SAD regardless of the actual depressive status of the patients. They are consistent with a decrease of central serotonergic activity in SAD.
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