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Related Experiment Videos

Age-associated decrease in virus-specific CD8+ T lymphocytes during primary influenza infection.

John Leander Z Po1, Elizabeth M Gardner, Farvardin Anaraki

  • 1Department of Microbiology and Immunology, MCP Hahnemann School of Medicine, 2900 Queen Lane, Philadelphia, PA 19129, USA.

Mechanisms of Ageing and Development
|June 5, 2002
PubMed
Summary

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Aging impairs CD8+ T cell expansion during influenza A virus infection. This defect in T cell expansion, not effector function, delays viral clearance in aged mice.

Area of Science:

  • Immunology
  • Virology
  • Gerontology

Background:

  • CD8+ T cell responses are crucial for controlling viral infections.
  • Age-associated declines in immune function can increase susceptibility to pathogens.
  • The specific mechanisms underlying reduced CD8+ T cell efficacy in aged individuals remain incompletely understood.

Purpose of the Study:

  • To investigate the impact of aging on CD8+ T cell responses during primary influenza A virus infection.
  • To elucidate the mechanisms responsible for age-related deficits in CD8+ T cell function and viral clearance.

Main Methods:

  • Comparison of pulmonary CD8+ T cell responses in young adult (6 months) and aged (22 months) C57BL/6 mice infected with influenza A virus.
  • Flow cytometry analysis using MHC Class I tetramers for influenza A nucleoprotein (NP) epitope.

Related Experiment Videos

  • Assessment of virus-specific cytotoxic T lymphocyte (CTL) activity and cytokine production (interferon-gamma).

    • Main Results:

    • Aged mice exhibited a significant reduction in the percentage and number of influenza-specific CD8+ T cells (NP+CD8+).
    • Virus-specific CTL activity and interferon-gamma production by CD8+ T cells were diminished in aged mice.
    • Aged mice showed delayed expansion of NP+CD8+ T cells, correlating with delayed viral clearance.

    Conclusions:

    • Age-related impairment of CD8+ T cell responses during influenza A infection is primarily due to defective T cell expansion.
    • Effector functions of influenza-specific CD8+ T cells appear largely preserved in aged mice.
    • These findings highlight a critical age-related defect in T cell expansion impacting host defense against viral pathogens.