Age-related CD8+ T cell clonal expansions express elevated levels of CD122 and CD127 and display defects in perceiving homeostatic signals

Ilhem Messaoudi, Jessica Warner, Janko Nikolich-Žugich

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Aging is accompanied by numerous changes in T cell biology. Among the most dramatic changes at the population level are the appearance and persistence of CD8+ T cell clonal expansions (TCE), whose frequency increases steadily with age, and whose biology is incompletely understood. In this study, we examined trafficking, phenotypic makeup, and homeostatic responsiveness of TCE, which arise spontaneously in specific pathogen-free mice. We show that these cells make up a specialized subset of central memory T cells with distinguishable phenotypic characteristics, most notably the higher expression of CD122 and CD127, molecules that make up IL-15R and IL-7R, respectively, than other memory T cells. We confirm that these cells proliferate at a continuous pace upon adoptive transfer into the eulymphoid recipient, unlike their non-TCE memory-phenotype counterparts, which remain undivided and die. However, upon transfer into lymphopenic recipients, TCE fail to rapidly expand, but rather resume their slow, continuous proliferation. The above results are discussed in light of possible mechanisms that afford selective survival advantage to TCE over other T cells in an aged T lymphocyte pool.

Original languageEnglish (US)
Pages (from-to)2784-2792
Number of pages9
JournalJournal of Immunology
Volume177
Issue number5
DOIs
StatePublished - Sep 1 2006
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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