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Heterogeneity of changes in lymphoproliferative ability with increasing age

D M Murasko1, B J Nelson, D Matour

  • 1Department of Microbiology, Medical College of Pennsylvania, Philadelphia 19129.

Experimental Gerontology
|January 1, 1991
PubMed

Insights

Aging reduces lymphoproliferation, but individual responses vary greatly. Interleukin-2 (IL-2) levels and responses to supplemental IL-2 also show significant heterogeneity in elderly individuals.

Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Immune function, including lymphoproliferation, generally declines with age.
  • Significant individual variability exists in immune responses among elderly populations.

Purpose of the Study:

  • To investigate the heterogeneity in mitogen-induced lymphoproliferation and interleukin-2 (IL-2) production in aging individuals.
  • To determine the impact of exogenous IL-2 on lymphoproliferation in elderly subjects.
  • To explore the influence of genetic factors on age-related changes in immune responses.

Main Methods:

  • Measurement of mitogen-induced lymphoproliferation in human subjects.
  • Quantification of detectable interleukin-2 (IL-2) levels post-stimulation.
  • Assessment of proliferation response following exogenous IL-2 administration.
  • Analysis of immune responses in inbred rat strains under controlled conditions.

Main Results:

  • Individual variations in lymphoproliferation and IL-2 levels were observed in elderly subjects.
  • Exogenous IL-2 supplementation enhanced proliferation in approximately one-third of elderly participants.
  • Genetic factors significantly impact proliferation levels and age-related decline, with variation present even within inbred rat strains.

Conclusions:

  • Age-related decline in lymphoproliferation is characterized by substantial individual heterogeneity.
  • Interleukin-2 (IL-2) availability and response are key factors contributing to this variability.
  • Genetic background plays a crucial role in modulating immune responses during aging.

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