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2013 ; 190
(11
): 5506-15
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Regulation of the expression of GARP/latent TGF-?1 complexes on mouse T cells and
their role in regulatory T cell and Th17 differentiation
#MMPMID23645881
Edwards JP
; Fujii H
; Zhou AX
; Creemers J
; Unutmaz D
; Shevach EM
J Immunol
2013[Jun]; 190
(11
): 5506-15
PMID23645881
show ga
GARP/LRRC32 was defined as a marker of activated human regulatory T cells (Tregs)
that is responsible for surface localization of latent TGF-?1. We find that GARP
and latent TGF-?1 are also found on mouse Tregs activated via TCR stimulation;
however, in contrast to human Tregs, GARP is also expressed at a low level on
resting Tregs. The expression of GARP can be upregulated on mouse Tregs by IL-2
or IL-4 exposure in the absence of TCR signaling. GARP is expressed at a low
level on Tregs within the thymus, and Treg precursors from the thymus
concomitantly express GARP and Foxp3 upon exposure to IL-2. The expression of
GARP is independent of TGF-?1 and TGF-?1 loading into GARP and is independent of
furin-mediated processing of pro-TGF-?1 to latent TGF-?1. Specific deletion of
GARP in CD4(+) T cells results in lack of expression of latent TGF-?1 on
activated Tregs. GARP-deficient Tregs develop normally, are present in normal
numbers in peripheral tissues, and are fully competent suppressors of the
activation of conventional T cells in vitro. Activated Tregs expressing
GARP/latent TGF-?1 complexes are potent inducers of Th17 differentiation in the
presence of exogenous IL-6 and inducers of Treg in the presence of IL-2.
Induction of both Th17-producing cells and Tregs is caused preferentially by
Tregs expressing the latent TGF-?1/GARP complex on their cell surface rather than
by secreted latent TGF-?1.