Effects of IL-7 on memory CD8+ T cell homeostasis are influenced by the timing of therapy in mice

Som G. Nanjappa, Jane H. Walent, Michel Morre, M. Suresh

Research output: Contribution to journalArticlepeer-review

Abstract

IL-7 is integral to the generation and maintenance of CD8+ T cell memory, and insufficient IL-7 is believed to limit survival and the persistence of memory CD8+ T cells. Here, we show that during the mouse T cell response to lymphocytic choriomeningitis virus, IL-7 enhanced the number of memory CD8+ T cells when its administration was restricted to the contraction phase of the response. Likewise, IL-7 administration during the contraction phase of the mouse T cell response to vaccinia virus or a DNA vaccine potentiated antigen-specific CD8+ memory T cell proliferation and function. Qualitatively, CD8+ T cells from IL-7-treated mice exhibited superior recall responses and improved viral control. IL-7 treatment during the memory phase stimulated a marked increase in the number of memory CD8+ T cells, but the effects were transient. IL-7 therapy during contraction of the secondary CD8+ T cell response also expanded the pool of memory CD8+ T cells. Collectively, our studies show differential effects of IL-7 on memory CD8+ T cell homeostasis and underscore the importance of the timing of IL-7 therapy to effectively improve CD8+ T cell memory and protective immunity. These findings may have implications in the clinical use of IL-7 as an immunotherapeutic agent to bolster vaccine-induced CD8+ T cell memory.

Original languageEnglish (US)
Pages (from-to)1027-1039
Number of pages13
JournalJournal of Clinical Investigation
Volume118
Issue number3
DOIs
StatePublished - Mar 2008
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)

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