Regulation of the expression of GARP/latent TGF-ß1 complexes on mouse T cells and their role in regulatory T cell and Th17 differentiation.
J Immunol
; 190(11): 5506-15, 2013 Jun 01.
Article
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| MEDLINE
| ID: mdl-23645881
ABSTRACT
GARP/LRRC32 was defined as a marker of activated human regulatory T cells (Tregs) that is responsible for surface localization of latent TGF-ß1. We find that GARP and latent TGF-ß1 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-ß1 and TGF-ß1 loading into GARP and is independent of furin-mediated processing of pro-TGF-ß1 to latent TGF-ß1. Specific deletion of GARP in CD4(+) T cells results in lack of expression of latent TGF-ß1 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-ß1 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-ß1/GARP complex on their cell surface rather than by secreted latent TGF-ß1.
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Banco de datos:
MEDLINE
Asunto principal:
Diferenciación Celular
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Linfocitos T Reguladores
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Proteínas de Unión a TGF-beta Latente
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Células Th17
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Proteínas de la Membrana
Límite:
Animals
Idioma:
En
Año:
2013
Tipo del documento:
Article