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Immunity. 2008 Jul 18;29(1):90-100. doi: 10.1016/j.immuni.2008.04.022. Epub 2008 Jun 26.

Thymic selection determines gammadelta T cell effector fate: antigen-naive cells make interleukin-17 and antigen-experienced cells make interferon gamma.

Author information

1
Department of Microbiology and Immunology, Stanford University, Stanford, CA 94305, USA.

Abstract

gammadelta T cells uniquely contribute to host immune defense, but how this is accomplished remains unclear. Here, we analyzed the nonclassical major histocompatibility complex class I T10 and T22-specific gammadelta T cells in mice and found that encountering antigen in the thymus was neither required nor inhibitory for their development. But when triggered through the T cell receptor, ligand-naive lymphoid-gammadelta T cells produced IL-17, whereas ligand-experienced cells made IFN-gamma. Immediately after immunization, a large fraction of IL-17(+) gammadelta T cells were found in the draining lymph nodes days before the appearance of antigen-specific IL-17(+) *beta T cells. Thus, thymic selection determines the effector fate of gammadelta T cells rather than constrains their antigen specificities. The swift IL-17 response mounted by antigen-naive gammadelta T cells suggests a critical role for these cells at the onset of an acute inflammatory response to novel antigens.

PMID:
18585064
PMCID:
PMC2601709
DOI:
10.1016/j.immuni.2008.04.022
[Indexed for MEDLINE]
Free PMC Article

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