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2017 ; 199
(2
): 391-396
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Cutting Edge: Active TGF-?1 Released from GARP/TGF-?1 Complexes on the Surface of
Stimulated Human B Lymphocytes Increases Class-Switch Recombination and
Production of IgA
#MMPMID28607112
Dedobbeleer O
; Stockis J
; van der Woning B
; Coulie PG
; Lucas S
J Immunol
2017[Jul]; 199
(2
): 391-396
PMID28607112
show ga
Production of active TGF-? is regulated at a posttranslational level and implies
release of the mature cytokine dimer from the inactive, latent TGF-? precursor.
There are several cell-type specific mechanisms of TGF-? activation. We
identified a new mechanism operating on the surface of human regulatory T cells
and involving membrane protein GARP, which binds latent TGF-?1. The paracrine
activity of regulatory T cell-derived TGF-?1 contributes to immunosuppression and
can be inhibited with anti-GARP Abs. Whether other immune cell types use surface
GARP to activate latent TGF-?1 was not known. We show in this study that
stimulated, human B lymphocytes produce active TGF-?1 from surface GARP/latent
TGF-?1 complexes with isotype switching to IgA production.