A Toll-like receptor 2/6 agonist reduces allergic airway inflammation in chronic respiratory sensitisation to Timothy grass pollen antigens.
Int Arch Allergy Immunol
; 152(2): 131-9, 2010.
Article
en En
| MEDLINE
| ID: mdl-20016195
ABSTRACT
BACKGROUND:
The hygiene hypothesis negatively correlates the microbial burden of the environment with the prevalence of T helper type 2 (Th2)-related disorders, e.g. allergy and asthma. This is explained by Th1 triggering through pathogen-associated molecular patterns via Toll-like receptors (TLRs). In this study, the biological effects of a TLR2/6 agonist as a potential treatment of allergic inflammation are explored.METHODS:
In a model of chronic allergic airway inflammation induced by intranasal administration of Timothy grass pollen allergen extract, early TLR agonism and/or interferon (IFN)-gamma administration was compared to the therapeutic and immune-modulating effects of dexamethasone with regard to the cellular inflammation and cytokine profiles.RESULTS:
Eosinophilic inflammation was clearly reduced by TLR2/6 agonism. This effect was also seen without simultaneous administration of IFN-gamma. However, lymphocyte counts were not affected among the different treatment groups. More precise determination of the lymphocyte-mediated immune reaction showed that TLR2/6 agonism induced neither CD4+foxp3+ regulatory T cells in draining lymph nodes nor a pronounced Th1 immune response. In contrast, dexamethasone reduced both sensitisation as well as allergic inflammation and, in addition, CD11c+ antigen-presenting cells in lymph nodes. Our data clearly point to the potential to rebalance Th2-skewed allergic immune responses by therapeutic TLR2/6 agonist administration.CONCLUSION:
The use of the TLR2/6 agonist is a promising therapeutic approach in diseases with an imbalance in T cell responses, such as allergy and asthma.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Polen
/
Hipersensibilidad Respiratoria
/
Phleum
/
Receptor Toll-Like 2
/
Receptor Toll-Like 6
/
Antígenos de Plantas
/
Lipopéptidos
Tipo de estudio:
Prognostic_studies
/
Risk_factors_studies
Idioma:
En
Año:
2010
Tipo del documento:
Article