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Humoral immunity in aging

R Paganelli1, E Scala, I Quinti

  • 1Department of Clinical Immunology, La Sapienza University, Roma, Italy.

Aging (Milan, Italy)
|June 1, 1994
PubMed
Summary

Aging impairs immune function, reducing T-cell IL-2 production but increasing other cytokines that affect B-cell differentiation. This leads to altered immunoglobulin levels and impaired humoral immunity in the elderly.

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Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Aging is associated with immune system decline, affecting both B and T lymphocyte functions.
  • T cells from aged individuals show reduced interleukin-2 (IL-2) production, a key cytokine for T-cell proliferation and function.
  • Conversely, certain pro-inflammatory cytokines, including IL-1, IL-3, IL-4, IL-6, and TNF-alpha, are upregulated in elderly subjects.

Purpose of the Study:

  • To review the complex changes in B and T lymphocyte interactions during aging.
  • To analyze the impact of age-related cytokine alterations on humoral immune responses.
  • To discuss the implications for B cell differentiation, immunoglobulin production, and overall immune function in aged populations.

Main Methods:

  • Review of existing literature on immune function in aging.
  • Analysis of cytokine production profiles in aged mice and humans.
  • Examination of immunoglobulin (Ig) subclass levels and B lymphocyte populations in sera of aged subjects.

Main Results:

  • Aged T cells exhibit diminished IL-2 production, while IL-1, IL-3, IL-4, IL-6, and TNF-alpha levels are elevated.
  • Increased production of these cytokines influences B cell differentiation, isotype switching, and immunoglobulin (Ig) production.
  • A significant rise in IgG subclasses and IgA is observed in aged individuals, despite a decrease in circulating B lymphocytes.

Conclusions:

  • Aging presents a paradoxical immune profile with reduced T-cell signaling but enhanced cytokine production affecting B cells.
  • These alterations contribute to impaired primary immune responses, mucosal immunity, and autoantibody production in the elderly.
  • Understanding these age-related immune shifts is crucial for addressing health challenges in aging populations.

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