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  • Title: Hormonal responses to the administration of m-chlorophenylpiperazine in patients with seasonal affective disorder and controls.
    Author: Garcia-Borreguero D, Jacobsen FM, Murphy DL, Joseph-Vanderpool JR, Chiara A, Rosenthal NE.
    Journal: Biol Psychiatry; 1995 May 15; 37(10):740-9. PubMed ID: 7640329.
    Abstract:
    We report on the plasma cortisol and prolactin responses to the serotonergic agonist m-CPP (0.1 mg/kg) in 10 patients with winter seasonal affective disorder (SAD) and 10 controls during the winter, in both untreated and bright light-treated conditions; and on 8 other SAD patients and 8 other controls during the summer. Following m-CPP infusion, untreated patients had exaggerated prolactin (p < .05) and cortisol (p < .05) responses compared to controls. Light treatment significantly reduced responses of both hormones to m-CPP (prolactin: p < .01; cortisol: p < .01). When untreated winter subjects and summer subjects were compared, cortisol, but not prolactin responses to m-CPP were found to be higher in patients than in controls during the winter, and lower in patients than in controls during the summer (diagnosis by season: p < .05). These results are consistent with those of our previous report on the behavioral responses to m-CPP in the same patients and suggest an abnormality in serotonergic function in untreated SAD patients in winter, which is normalized following treatment with light therapy and naturally during the summer.
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