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The brain, depression, and the immune system.

R M Restak1

  • 1Department of Neurology, Georgetown University Medical Center, Washington, DC 20009.

The Journal of Clinical Psychiatry
|May 1, 1989
PubMed
Summary

The brain

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Area of Science:

  • Neuroimmunology
  • Psychoneuroimmunology
  • Brain-Immune Interactions

Background:

  • The brain significantly influences immune system functions crucial for health.
  • Immune system modulation by the brain may be lateralized, with a stronger link to left cerebral activity.
  • Depression is associated with neuroimmune changes, often observed after left-sided brain lesions.

Purpose of the Study:

  • To explore the relationship between brain function, immune responses, and psychological states like depression and stress.
  • To investigate the lateralization of brain influence on immune functioning.
  • To examine the impact of stress, particularly uncontrollable stress, on the hypothalamic-pituitary-adrenal (HPA) axis and its parallels with depression.

Main Methods:

  • Review of existing literature on brain-immune interactions.
  • Analysis of studies examining cerebral lesions and subsequent psychological and immunological changes.
  • Discussion of stress paradigms and their measurement, including HPA axis activation (elevated plasma adrenocorticotrophic hormone).

Main Results:

  • Left cerebral involvement is more frequently associated with depression and neuroimmune changes compared to right-sided involvement.
  • Uncontrollable stress can lead to hypothalamic-pituitary-adrenal axis (HPA) dysfunction, mirroring changes seen in depression.
  • The controllability of stress is a critical factor, with psychological resources potentially mitigating the impact of uncontrollable stressors.

Conclusions:

  • Brain lateralization plays a role in modulating immune responses and psychological states.
  • HPA axis dysfunction due to stress shares similarities with neuroimmune changes in depression.
  • Further research is needed to determine if individual differences in stress tolerance correlate with specific neuroimmune markers.

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