Colitogenic effector T cells: roles of gut-homing integrin, gut antigen specificity and γδ T cells.
Immunol Cell Biol
; 92(1): 90-8, 2014 Jan.
Article
in En
| MEDLINE
| ID: mdl-24189163
ABSTRACT
Disturbance of T-cell homeostasis could lead to intestinal inflammation. Naive CD4 T cells undergoing spontaneous proliferation, a robust proliferative response that occurs under severe lymphopenic conditions, differentiate into effector cells producing Th1- and/or Th17-type cytokines and induce a chronic inflammation in the intestine that resembles human inflammatory bowel disease. In this study, we investigated the key properties of CD4 T cells necessary to induce experimental colitis. α4ß7 upregulation was primarily induced by mesenteric lymph node (mLN) resident CD11b(+) dendritic cell subsets via transforming growth factor beta (TGFß)/retinoic acid-dependent mechanism. Interestingly, α4ß7 expression was essential but not sufficient to induce inflammation. In addition to gut-homing specificity, expression of gut Ag specificity was also crucial. T-cell acquisition of the specificity was dramatically enhanced by the presence of γδ T cells, a population previously shown to exacerbate T-cell-mediated colitis. Importantly, interleukin (IL)-23-mediated γδ T cell stimulation was necessary to enhance colitogenicity but not gut antigen reactivity of proliferating CD4 T cells. These findings demonstrate that T-cell colitogenicity is achieved through multiple processes, offering a therapeutic rationale by intervening these pathways.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
CD4-Positive T-Lymphocytes
/
Integrins
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Receptors, Antigen, T-Cell, gamma-delta
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Colitis
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Gastrointestinal Tract
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Th17 Cells
Language:
En
Journal:
Immunol Cell Biol
Journal subject:
ALERGIA E IMUNOLOGIA
Year:
2014
Document type:
Article
Affiliation country: