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Mood disorders and allostatic load.

Bruce S McEwen1

  • 1Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology, The Rockefeller University, New York, New York 10021, USA.

Biological Psychiatry
|August 2, 2003
PubMed
Summary

Chronic stress causes brain changes, leading to "allostatic load." This damage, seen in depression and PTSD, affects nerve cells and body systems, highlighting the need for documentation.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Stress Research

Background:

  • The brain manages responses to stress via hormones and neural circuits.
  • Key brain regions like the amygdala and hippocampus are involved in stress interpretation and regulation.
  • Both regions show altered structure and function under stress, particularly in psychiatric conditions.

Purpose of the Study:

  • To explore the neural mechanisms underlying stress responses.
  • To define the concept of allostatic load and its impact on the brain and body.
  • To link allostatic load to psychiatric disorders like depression and PTSD.

Main Methods:

  • Review of neurobiological stress response pathways.
  • Examination of structural and functional changes in the amygdala and hippocampus.
  • Analysis of hormonal mediators and their effects on neural tissues.
  • Correlation of neural changes with physiological outcomes.

Main Results:

  • The amygdala shows hyperactivity and hypertrophy with repeated stress.
  • The hippocampus exhibits atrophy, reduced dendritic branching, and neuronal loss.
  • Chronic stress leads to 'allostatic load,' characterized by wear and tear on the body.
  • Allostatic load is associated with impaired immunity, metabolic dysfunction, and neural atrophy.

Conclusions:

  • Neural changes mirror systemic damage from chronic stress, termed allostatic load.
  • Allostatic load contributes to physical and mental health problems, including depression and PTSD.
  • Further documentation of allostatic load in chronic anxiety disorders is warranted.

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