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A Chronic Immobilization Stress Protocol for Inducing Depression-Like Behavior in Mice
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Pathophysiology of hypercortisolism in depression.

B J Carroll1, F Cassidy, D Naftolowitz

  • 1Pacific Behavioral Research Foundation, Carmel, CA, USA. bcarroll@redshift.com

Acta Psychiatrica Scandinavica. Supplementum
|February 7, 2007
PubMed
Summary

Depression involves increased adrenocorticotropin (ACTH) secretion, regardless of cortisol levels. Hypercortisolemia in depression stems from adrenal changes causing irregular cortisol release, indicating physiological stress.

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Area of Science:

  • Neuroendocrinology
  • Psychiatry
  • Biomarker Research

Background:

  • Hypercortisolemia is observed in depression but its underlying mechanisms are debated.
  • Understanding the hypothalamic-pituitary-adrenal (HPA) axis dynamics is crucial for depression research.

Purpose of the Study:

  • To investigate the dynamics of adrenocorticotropin (ACTH) and cortisol secretion in depressed patients with and without hypercortisolemia.
  • To elucidate the role of HPA axis regulation in different subtypes of depression.

Main Methods:

  • Utilized deconvolution analysis for 24-hour pulsatile secretion patterns of ACTH and cortisol.
  • Employed approximate entropy (ApEn) to assess secretory regularity and cross-ApEn for ACTH-cortisol synchrony.
  • Applied cosine regression to analyze 24-hour rhythmicity of the HPA axis.

Main Results:

  • Hypercortisolemia in depression is linked to melancholic and psychotic subtypes, with elevated ACTH and cortisol secretion primarily due to increased burst masses.
  • Cortisol secretion was irregular (high ApEn) with impaired ACTH-cortisol feedforward coupling, while ACTH secretion patterns and adrenal responsiveness remained normal.
  • Non-hypercortisolemic depressed patients showed normal ACTH regulation but reduced total cortisol secretion.

Conclusions:

  • Severe depression features central HPA axis overdrive, evidenced by increased ACTH secretion irrespective of cortisol levels.
  • Depressive hypercortisolemia arises from adrenal cortex alterations leading to disordered, ACTH-independent cortisol release, signifying physiological stress in specific depression subtypes.