Differential effects of α4ß7 and GPR15 on homing of effector and regulatory T cells from patients with UC to the inflamed gut in vivo.
Gut
; 65(10): 1642-64, 2016 10.
Article
em En
| MEDLINE
| ID: mdl-26209553
OBJECTIVE: Gut homing of lymphocytes via adhesion molecules has recently emerged as new target for therapy in IBDs. We aimed to analyse the in vivo homing of effector (Teff) and regulatory (Treg) T cells to the inflamed gut via α4ß7 and G protein receptor GPR15. DESIGN: We assessed the expression of homing receptors on T cells in peripheral blood and inflamed mucosa. We studied the migration pattern and homing of Teff and Treg cells to the inflamed gut using intravital confocal microscopy and FACS in a humanised mouse model in dextran sodium sulfate-treated NSG (NOD.Cg-Prkdcscid-Il2rgtm1Wjl/SzJ) mice. RESULTS: Expression of GPR15 and α4ß7 was significantly increased on Treg rather than Teff cells in peripheral blood of patients with UC as compared with Crohn's disease and controls. In vivo analysis in a humanised mouse model showed augmented gut homing of UC Treg cells as compared with controls. Moreover, suppression of UC (but not control) Teff and Treg cell homing was noted upon treatment with the α4ß7 antibody vedolizumab. In contrast, siRNA blockade of GPR15 had only effects on homing of Teff cells but did not affect Treg homing in UC. Clinical vedolizumab treatment was associated with marked expansion of UC Treg cells in peripheral blood. CONCLUSIONS: α4ß7 rather than GPR15 is crucial for increased colonic homing of UC Treg cells in vivo, while both receptors control UC Teff cell homing. Vedolizumab treatment impairs homing of UC Treg cells leading to their accumulation in peripheral blood with subsequent suppression of systemic Teff cell expansion.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Colite Ulcerativa
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Doença de Crohn
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Integrinas
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Receptores Acoplados a Proteínas G
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Anticorpos Monoclonais Humanizados
Limite:
Animals
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Humans
Idioma:
En
Revista:
Gut
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Alemanha