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IL-15 produced and trans-presented by DCs underlies homeostatic competition between CD8 and {gamma}{delta} T cells in

Jeong-su Do1, Booki Min

  • 1Department of Immunology, Lerner Research Institute, The Cleveland Clinic Foundation, OH 44195, USA.

Blood
|April 22, 2009
PubMed

Homeostatic mechanism by which peripheral T-cell subsets are maintained in vivo remains largely unknown. Using a T-cell proliferation model under lymphopenic settings, we now demonstrate that gammadelta T cells limit CD8 T-cell expansion but not the initial proliferation after transfer into lymphopenic recipients. Interleukin-15 (IL-15) produced by and trans-presented on the membrane of the CD11c(+) dendritic cells (DCs) is the key factor that mediates homeostatic competition between CD8 and gammadelta T cells, revealing previously unrecognized IL-15-dependent homeostatic mechanisms between different T-cell subsets in vivo.

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