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2015 ; 16
(6
): 635-41
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Thymic regulatory T cell niche size is dictated by limiting IL-2 from
antigen-bearing dendritic cells and feedback competition
#MMPMID25939026
Weist BM
; Kurd N
; Boussier J
; Chan SW
; Robey EA
Nat Immunol
2015[Jun]; 16
(6
): 635-41
PMID25939026
show ga
The thymic production of regulatory T cells (Treg cells) requires interleukin 2
(IL-2) and agonist T cell antigen receptor (TCR) ligands and is controlled by
competition for a limited developmental niche, but the thymic sources of IL-2 and
the factors that limit access to the niche are poorly understood. Here we found
that IL-2 produced by antigen-bearing dendritic cells (DCs) had a key role in
Treg cell development and that existing Treg cells limited new development of
Treg cells by competing for IL-2. Our data suggest that antigen-presenting cells
(APCs) that can provide both IL-2 and a TCR ligand constitute the thymic niche
and that competition by existing Treg cells for a limited supply of IL-2 provides
negative feedback for new production of Treg cells.