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[Aging and the immune system. Experimental aspects].

F Barrat1, B Lesourd, H J Boulouis

  • 1Laboratoire de Microbiologie, Immunologie, Institut National de Recherche Agronomique (INRA), Ecole Nationale Vétérinaire d'Alfort, Maisons, France.

Bulletin De L'Academie Nationale De Medecine
|November 24, 1999
PubMed
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Pregnancy and sex significantly impact immune system aging in mice. Parity influences immune cell distribution and T cell function, potentially explaining women's longer lifespan.

Area of Science:

  • Immunology
  • Aging Research
  • Reproductive Biology

Background:

  • Age-related immune system decline (immunosenescence) is a significant health concern.
  • The influence of reproductive history (parity) and sex on immunosenescence remains understudied.
  • Understanding these factors is crucial for addressing age-related diseases and sex-specific longevity.

Purpose of the Study:

  • To investigate the impact of pregnancies and sex on age-related changes in immune cell populations and T cell function in mice.
  • To compare immune profiles of multiparous females, virgin females, and males across different age groups.

Main Methods:

  • Flow cytometry was used to analyze spleen cell populations (T cells, B cells, macrophages) in mice at 2, 8, 15, and 23 months of age.
  • Development of naive and memory T cells (CD4+ and CD8+) was assessed.

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  • In vitro cytokine secretion (IL-2, IL-4, gamma-interferon, GM-CSF) from activated spleen cells was measured.
  • Main Results:

    • Pregnancy (parity) had both short-term (e.g., preserved IL-2 production) and long-term (e.g., elevated macrophage levels) effects on immune aging.
    • Multiparous females showed delayed memory CD4+ cell appearance and higher IL-4 and GM-CSF production in late adulthood.
    • Sex differences included lower macrophage levels and gamma-interferon secretion in males compared to females in later life.

    Conclusions:

    • Immune cell distribution and T cell function during aging are dependent on parity and sex.
    • These parity- and sex-dependent immune changes may influence age-related disease susceptibility and contribute to observed sex differences in longevity.