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Related Experiment Videos

Interleukin-6 production does not increase with age.

A A Beharka1, M Meydani, D Wu

  • 1Jean Mayer US Department of Agriculture Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts 02111, USA.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|February 24, 2001
PubMed
Summary

Aging does not increase interleukin-6 (IL-6) production in healthy individuals. Higher IL-6 levels in older adults may indicate underlying health issues, not normal aging. This study focused on healthy young and elderly men.

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Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Conflicting reports exist regarding the effect of aging on interleukin-6 (IL-6) production.
  • Previous studies often lacked rigorous health screening of subjects, potentially confounding results.
  • IL-6 is a cytokine implicated in inflammation and age-related diseases.

Purpose of the Study:

  • To investigate the effect of age on IL-6 production in carefully screened healthy young and elderly men.
  • To examine IL-6 production by peripheral blood mononuclear cells (PBMC) and murine macrophages.
  • To assess the influence of IL-6 on other inflammatory mediators.

Main Methods:

  • Health screening of 20 young (20-30 years) and 26 elderly (>65 years) male subjects.
  • Measurement of circulating IL-6 levels.

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  • In vitro culture of PBMC with and without mitogens (PHA, ConA) in autologous plasma (AP) or fetal bovine serum (FBS).
  • Assessment of IL-6 production by murine peritoneal macrophages (Mphi).

    • Main Results:

    • No significant difference in circulating IL-6 levels between healthy young and elderly subjects.
    • Age did not affect spontaneous or mitogen-stimulated IL-6 production by PBMC in FBS.
    • Elderly subjects' PBMC produced less IL-6 upon ConA stimulation in AP compared to young subjects.
    • Murine macrophage IL-6 production was not influenced by age.

    Conclusions:

    • Increased IL-6 production is not a normal consequence of aging in healthy individuals.
    • Elevated IL-6 in older populations may be indicative of undiagnosed disease.
    • IL-6 does not appear to influence the production of prostaglandin E2 or nitric oxide by macrophages.