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Immune memory in CD4+ CD45RA+ T cells

D Richards1, M D Chapman, J Sasama

  • 1Department of Allergy and Respiratory Medicine, United Medical School of Guy's Hospital, London, UK.

Immunology
|July 1, 1997
PubMed
Summary
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Human peripheral CD4+ CD45RA+ T cells demonstrate antigen-specific immune memory, similar to CD4+ CD45RO+ T cells. This finding supports the hypothesis that immune memory resides in both cell types during chronic responses to inhaled antigens.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Immune memory is crucial for adaptive immunity.
  • CD4+ T cells are key players in immune responses.
  • The role of CD45RA+ T cells in immune memory is not fully understood.

Purpose of the Study:

  • To investigate whether human peripheral CD4+ CD45RA+ T cells possess antigen-specific immune memory.
  • To compare the immune memory capacity of CD4+ CD45RA+ and CD4+ CD45RO+ T cells.

Main Methods:

  • Isolation of CD4+ CD45RA+ and CD4+ CD45RO+ T cells using positive and negative selection.
  • Determination of responder frequencies to Dermatophagoides pteronyssinus antigen.
  • Cloning of antigen-specific T cells via limiting dilution.
  • Analysis of cytokine production (IL-4, IFN-gamma) and V beta gene usage.

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Main Results:

  • CD4+ CD45RA+ T cells exhibited antigen-specific responses to Dermatophagoides pteronyssinus.
  • Responder frequencies in CD4+ CD45RA+ cells were comparable to CD4+ CD45RO+ cells, particularly in atopic donors.
  • Cloned T cells from both populations proliferated in response to the specific antigen.
  • Cytokine production patterns did not significantly differ between clones derived from CD4+ CD45RA+ and CD4+ CD45RO+ precursors.

Conclusions:

  • Human peripheral CD4+ CD45RA+ T cells possess antigen-specific immune memory.
  • Immune memory resides in both CD4+ CD45RA+ and CD4+ CD45RO+ T cell populations during chronic immune responses.
  • These findings have implications for understanding T cell subsets in allergic and chronic inflammatory diseases.