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Related Experiment Videos

T-cell function in aging: mechanisms of decline.

D M Murasko1, I M Goonewardene

  • 1Medical College of Pennsylvania.

Annual Review of Gerontology & Geriatrics
|January 1, 1990
PubMed
Summary

Aging impairs T-cell proliferation due to defects in intracellular signaling, particularly calcium mobilization in memory T cells. While some surface markers and cytokine production change, the exact causes of reduced T-cell function in older adults remain under investigation.

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Area of Science:

  • Immunology
  • Aging Research
  • Cellular Biology

Background:

  • T lymphocyte proliferation declines with age, impacting immune responses.
  • The precise mechanisms underlying age-related T-cell dysfunction are not fully understood.

Purpose of the Study:

  • To summarize current data on age-associated changes in T lymphocytes.
  • To identify potential causes for decreased T-cell proliferation in elderly subjects.

Main Methods:

  • Review of existing literature on T-cell function in aging.
  • Analysis of data on cell surface markers, intracellular signaling pathways (e.g., calcium mobilization), and cytokine production.

Main Results:

  • T-cell interaction with foreign stimuli appears largely intact.

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  • Defects in intracellular signaling, such as reduced calcium (Ca++) accumulation, may impair T-cell activation, especially in memory T cells.
  • Decreased production of Interleukin-2 (IL-2) and Interferon-gamma (IFN-gamma) is observed in some species, including humans, but not consistently across all.

    • Conclusions:

    • Age-related T-cell proliferation defects are likely multifactorial, involving intracellular signaling pathways.
    • Further research is needed to elucidate the role of specific signaling defects and genetic factors in human aging.
    • Understanding these changes is crucial for addressing age-related immune decline.