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Increased peripheral IL-4 leads to an expanded virtual memory CD8+ population.

Vanessa Kurzweil1, Ami LaRoche2, Paula M Oliver3

  • 1Cell and Molecular Biology Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and.

Journal of Immunology (Baltimore, Md. : 1950)
|May 6, 2014
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Summary

Excess peripheral interleukin-4 (IL-4) can induce a virtual memory (VM) CD8(+) T cell phenotype, suggesting VM and innate CD8(+) T cells may share similar origins. This finding impacts understanding of T cell memory development.

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Area of Science:

  • Immunology
  • T cell biology
  • Cellular immunology

Background:

  • Memory-phenotype CD8(+) T cells can develop without direct antigen (Ag) stimulation.
  • Virtual memory (VM) CD8(+) T cells arise peripherally, dependent on IL-15.
  • Innate CD8(+) T cells develop in the thymus due to thymic IL-4.

Purpose of the Study:

  • To investigate the relationship between VM CD8(+) T cells and innate CD8(+) T cells.
  • To determine if peripheral IL-4 can induce a memory phenotype in CD8(+) T cells.

Main Methods:

  • Utilized Nedd4-family interacting protein 1-deficient mice.
  • Analyzed CD4(+) T cell production of IL-4 due to JunB degradation defects.
  • Assessed peripheral CD8(+) T cell phenotype, including marker expression (CD44, CD122, Eomesodermin, CD49d).

Main Results:

  • Nedd4-family interacting protein 1(-/-) mice exhibited overproduction of IL-4 by CD4(+) T cells.
  • Excess peripheral IL-4 was sufficient to expand the VM CD8(+) T cell population.
  • Induced memory-like phenotype in CD8(+) T cells included elevated CD44, CD122, Eomesodermin and decreased CD49d.

Conclusions:

  • Peripheral IL-4 overproduction can drive the development of VM CD8(+) T cells.
  • VM CD8(+) T cells and innate CD8(+) T cells may originate from similar mechanisms.
  • This research provides new insights into T cell memory differentiation pathways.