Skewed representation of functionally distinct populations of Vγ9Vδ2 T lymphocytes in aging

Francesca Re, Fabrizio Poccia, Alessia Donnini, Beatrice Bartozzi, Giovanni Bernardini, Mauro Provinciali

Research output: Contribution to journalArticle

Abstract

We recently demonstrated that numerical and functional alterations of γδ T cells are present in healthy elderly. Here we observed that the decreased absolute number of Vγ9Vδ2 T cells present in old subjects in comparison with young/adult and middle aged donors is due to the reduction of naive and central memory Vγ9Vδ2 T cells bearing CD27 and CCR7 antigens. The proportion of effector/memory Vγ9Vδ2 T cells lacking CD27 or CCR7 markers was significantly increased in the peripheral blood of old subjects in comparison with younger donors. Moreover, the percentage of CD69+ γδ T cells was significantly increased in old subjects in comparison with younger donors after overnight activation, confirming that more effector cells are available in aged people. A functional analysis in young/adult and middle aged donors revealed that effector/memory CD27- Vγ9Vδ2 T cells are increased after 10-days of in vitro colture in the presence of isopentenylpyrophosphate (IPP) and IL-2. In contrast, the IPP+IL-2 mediated differentiation and expansion of CD27 - effector/memory cells was absent in old subjects, confirming a lack of naive and central memory cells responding to IL-2. Accordingly, the expansion index of effector/memory CD27- Vγ9Vδ2 T cells was negatively correlated with the donor age. Finally, terminally differentiated Vγ9Vδ2 T cells measured as perforin content after 10-day in vitro expansion showed no age-related difference. These data demonstrated a shift of the circulating γδ T cell population towards CD27- and CCR7- effector T cells in the elderly with the reduction of immature CD27+ and CCR7+ T cell precursors.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalExperimental Gerontology
Volume40
Issue number1-2
DOIs
Publication statusPublished - Jan 2005

Keywords

  • CD27
  • Chemokine receptors
  • Effector functions
  • Human γδ T cells
  • Immunosenescence

ASJC Scopus subject areas

  • Ageing
  • Medicine(all)
  • Biochemistry
  • Cell Biology
  • Endocrinology
  • Genetics
  • Molecular Biology

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