Lnk/Sh2b3 controls the production and function of dendritic cells and regulates the induction of IFN-γ-producing T cells.
J Immunol
; 193(4): 1728-36, 2014 Aug 15.
Article
em En
| MEDLINE
| ID: mdl-25024389
ABSTRACT
Dendritic cells (DCs) are proficient APCs that play crucial roles in the immune responses to various Ags and pathogens and polarize Th cell immune responses. Lnk/SH2B adaptor protein 3 (Sh2b3) is an intracellular adaptor protein that regulates B lymphopoiesis, megakaryopoiesis, and expansion of hematopoietic stem cells by constraining cytokine signals. Recent genome-wide association studies have revealed a link between polymorphism in this adaptor protein and autoimmune diseases, including type 1 diabetes and celiac disease. We found that Lnk/Sh2b3 was also expressed in DCs and investigated its role in the production and function of DC lineage cells. In Lnk(-/-) mice, DC numbers were increased in the spleen and lymph nodes, and growth responses of bone marrow-derived DCs to GM-CSF were augmented. Mature DCs from Lnk(-/-) mice were hypersensitive and showed enhanced responses to IL-15 and GM-CSF. Compared to normal DCs, Lnk(-/-) DCs had enhanced abilities to support the differentiation of IFN-γ-producing Th1 cells from naive CD4(+) T cells. This was due to their elevated expression of IL-12Rß1 and increased production of IFN-γ. Lnk(-/-) DCs supported the appearance of IFN-γ-producing T cells even under conditions in which normal DCs supported induction of regulatory T cells. These results indicated that Lnk/Sh2b3 plays a regulatory role in the expansion of DCs and might influence inflammatory immune responses in peripheral lymphoid tissues.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Células Dendríticas
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Interferon gama
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Células Th1
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Linfopoese
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Peptídeos e Proteínas de Sinalização Intracelular
Limite:
Animals
Idioma:
En
Revista:
J Immunol
Ano de publicação:
2014
Tipo de documento:
Article