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Related Experiment Videos

Rhythm-related changes in pituitary-adrenal function in depression.

B M Sherman, B Pfohl

    Journal of Affective Disorders
    |July 1, 1985
    PubMed
    Summary

    Depressed patients exhibit altered pituitary-adrenal activity, with abnormal adrenocorticotropic hormone (ACTH) and cortisol pulse characteristics. These rhythm disturbances may offer a more sensitive indicator of pituitary-adrenal dysregulation than the Dexamethasone Suppression Test.

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    Area of Science:

    • Neuroendocrinology
    • Chronobiology
    • Psychiatry

    Background:

    • The pituitary-adrenal axis plays a crucial role in the stress response and is frequently implicated in mood disorders.
    • Circadian rhythms of hormone secretion are fundamental to physiological regulation.
    • Previous research suggests potential alterations in the hypothalamic-pituitary-adrenal (HPA) axis in depression, but the precise nature of these changes, particularly concerning pulsatile secretion patterns, remains incompletely understood.

    Purpose of the Study:

    • To investigate and compare the pulsatile secretion patterns of adrenocorticotropic hormone (ACTH) and cortisol over a 24-hour period in individuals with depression and healthy controls.
    • To determine if alterations in pituitary-adrenal rhythmicity are associated with depression and the response to dexamethasone suppression.
    • To evaluate whether rhythm-related indices of pituitary-adrenal function are more sensitive indicators of HPA axis dysregulation than the Dexamethasone Suppression Test.

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    Main Methods:

    • Plasma samples were collected from depressed patients and healthy controls at 20-minute intervals over 24 hours.
    • Pulsatile secretion of ACTH and cortisol was analyzed using the PULSAR program to quantify pulse number, amplitude, duration, maximum concentration, and interval.
    • Patients were assessed for their response to the dexamethasone suppression test.

    Main Results:

    • Both healthy and depressed subjects demonstrated circadian patterns of pituitary-adrenal activity driven by significant changes in pulse amplitude, not frequency.
    • Depressed patients with an abnormal dexamethasone suppression test showed increased ACTH and cortisol pulse amplitude and duration, along with a phase advance in cortisol rhythm, compared to controls.
    • Some of these rhythm alterations were also observed in depressed patients who responded normally to dexamethasone, suggesting a broader pattern of dysregulation.

    Conclusions:

    • The circadian rhythm of pituitary-adrenal activity in humans is primarily regulated by variations in hormone pulse amplitude.
    • Specific alterations in ACTH and cortisol pulsatility, including increased amplitude and duration, and phase advance in cortisol rhythm, are associated with depression.
    • Rhythm-related indices of pituitary-adrenal function may serve as more sensitive biomarkers for detecting disturbed pituitary-adrenal regulation in depression than the conventional Dexamethasone Suppression Test.