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Published on: July 22, 2011

Evaluation of immune parameters in depressed patients

M E Bauer1, G J Gauer, C Luz

  • 1Department of Genetics, UFRGS, Porto Alegre, Brazil.

Life Sciences
|January 1, 1995
PubMed

Insights

Major depression is linked to reduced natural killer cell activity (NKCA), a key part of the immune system. This study found NKCA was lower in depressed patients, suggesting immune changes in depression.

Area of Science:

  • Immunology
  • Psychiatry
  • Cellular Biology

Background:

  • The link between depression and immune system dysfunction is frequently proposed.
  • Existing experimental data on this association are often contradictory.

Purpose of the Study:

  • To investigate cellular and humoral immunological activities in patients with major depressive disorder, unipolar subtype.
  • To compare immune markers in depressed patients with healthy controls.

Main Methods:

  • Evaluation of natural killer cell activity (NKCA).
  • Assessment of lymphocyte mitogenic responses.
  • Measurement of immunoglobulin (IgG, IgM, IgA) titers.
  • Analysis of hematological, hormonal, and nutritional variables.
  • Examination of the impact of familial depression history.

Main Results:

  • Natural killer cell activity (NKCA) was significantly reduced in major depression patients compared to controls (p < 0.001).
  • Lymphocyte mitogenic responses and immunoglobulin titers remained similar between groups.
  • Hematological, hormonal, and nutritional markers were within normal ranges for both patients and controls.
  • A family history of depression correlated with lower NKCA and increased phytohemagglutinin responses (p < 0.01).

Conclusions:

  • Depression, specifically the unipolar subtype, is associated with significantly reduced natural killer cell activity.
  • These findings suggest a potential differential inhibition of cellular immune responses in individuals with major depression.
  • Familial predisposition to depression may influence specific immune responses, including NKCA and lymphocyte reactivity.

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