IL-15 is required for sustained lymphopenia-driven proliferation and accumulation of CD8 T cells

Michelle M. Sandau, Colleen J. Winstead, Stephen C. Jameson

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Naive T cells undergo slow homeostatic proliferation in response to T cell lymphopenia, which is also called lymphopenia-induced proliferation (LIP). IL-7 is critically required for this process, but previous studies suggested IL-15 was expendable for LIP of naive CD8 T cells. In contrast, we show that IL-15 is important for sustained CD8 T cell proliferation and accumulation in a lymphopenic setting, as revealed by truncated LIP in IL-15-/- hosts. At the same time, we find that IL-12 enhances LIP by acting directly on the CD8 T cells and independently of IL-15, suggesting distinct pathways by which cytokines can regulate homeostatic proliferation. Interestingly, the memory-phenotype CD8 T cell generated by LIP in IL-15-/- hosts are phenotypically distinct from the rare endogenous memory-phenotype cells found in IL-15-/- animals, suggesting these cells are generated by different means. These findings demonstrate that cytokine requirements for LIP change during the process itself, illustrating the need to identify factors that regulate successive stages of lymphopenia-driven proliferation.

Original languageEnglish (US)
Pages (from-to)120-125
Number of pages6
JournalJournal of Immunology
Volume179
Issue number1
DOIs
StatePublished - Jul 1 2007

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