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Related Experiment Videos

Altered cytokine production in the elderly

L Rink1, I Cakman, H Kirchner

  • 1Institute of Immunology and Transfusion Medicine, University of Lübeck School of Medicine, Germany. rink@immu.mu-luebeck.de

Mechanisms of Ageing and Development
|August 28, 1998
PubMed
Summary

Elderly individuals exhibit an altered immune response, with decreased T-cell proliferation and a shift towards TH2-functions, increasing susceptibility to infections. Monocyte responses appear heightened, indicating a complex immune dysregulation in aging.

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Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Elderly individuals are more prone to infections and neoplasias due to impaired immune responses.
  • Key immune cells like lymphocytes show reduced function with age.

Purpose of the Study:

  • To investigate age-related changes in immune cell function, specifically lymphocytes and monocytes.
  • To identify cellular defects and dysfunctions contributing to altered immune responses in the elderly.

Main Methods:

  • Assessed lymphocyte proliferation and cytokine release (IL-2, sIL-2R, IFN-gamma, IL-4, IL-10) after mitogen induction.
  • Quantified T-helper 1 (TH1) and T-helper 2 (TH2) cytokine production.
  • Evaluated monocyte and leukocyte responses to lipopolysaccharide (LPS) and viral induction of IFN-alpha.

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Main Results:

  • Elderly lymphocytes exhibited decreased proliferation, reduced IL-2 and sIL-2R release, and lower IFN-gamma production.
  • A shift towards TH2 dominance (increased IL-4, IL-10) was observed in elderly lymphocytes.
  • Monocytes and leukocytes from the elderly showed increased production of pro-inflammatory cytokines (IL-1, IL-6, TNF-alpha) but decreased IFN-alpha induction by viruses.

Conclusions:

  • Aging is associated with significant cellular defects and dysfunctions in the immune system.
  • The elderly immune system displays a dysregulated TH1/TH2 balance, favoring TH2 responses, and altered monocyte/leukocyte activity.
  • These age-related immune changes contribute to increased susceptibility to infections and potentially other diseases in older adults.