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Interleukin 15 controls both proliferation and survival of a subset of memory-phenotype CD8(+) T cells

Adam D Judge1, Xiaohong Zhang, Hideki Fujii

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037, USA.

The Journal of Experimental Medicine
|October 9, 2002
PubMed

Insights

Memory T cells show mixed dependence on interleukin-15 (IL-15). Some CD8(+) T cell subsets require IL-15 for proliferation and survival, while others do not.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Previous research identified interleukin-15 (IL-15) as a key regulator of memory-phenotype CD44(hi) CD8(+) T cells.
  • The precise extent of IL-15 dependency for these T cells remained incompletely understood.

Purpose of the Study:

  • To investigate the heterogeneity of IL-15 dependency within memory-phenotype CD44(hi) CD8(+) T cell populations.
  • To delineate distinct subsets of CD44(hi) CD8(+) T cells based on their IL-15 sensitivity.

Main Methods:

  • Flow cytometry analysis of CD44, CD8, CD122, and Ly49 expression on T cells.
  • Assessment of T cell proliferation, survival, and bystander proliferation under varying IL-15 conditions.

Main Results:

  • CD44(hi) CD8(+) T cells are a mixed population with both IL-15-dependent and IL-15-independent subsets.
  • The CD122(hi) CD44(hi) CD8(+) T cell subset, particularly Ly49(+) cells, exhibits strong IL-15 dependency for proliferation and survival.
  • CD122(lo) CD44(hi) CD8(+) and CD44(hi) CD4(+) T cells are largely IL-15 independent.

Conclusions:

  • Memory T cell subsets display significant variability in their requirement for IL-15.
  • Differential IL-15 sensitivity among T cell subsets has implications for immune regulation and response.

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