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Persistence of asthma following allergen avoidance is associated with proTh2 myeloid dendritic cell activation

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Froidure, Antoine [UCL] Vandenplas, Olivier [UCL] D'Alpaos, Vinciane [UCL] Evrard, Geneviève [UCL] Pilette, Charles [UCL]

Background The natural history of asthma includes in some patients periods of disease remission, but the underlying mechanisms are unknown. Objectives We explored whether type 1 myeloid dendritic cell (mDC) dysfunction could be involved in the persistence of asthma, studying the controlled setting of occupational asthma after allergen avoidance. Methods We recruited 32 patients with occupational asthma to flour or latex ascertained by specific inhalation challenge and who were no longer exposed to the causal allergen. Leukapheresis was performed in each patient to isolate and characterise blood type 1 mDCs, and their functionality was studied in coculture with allogeneic CD4+ T cells from controls. Results At follow-up, 11/32 patients (34%) were characterised by the absence of symptoms and non-specific bronchial hyper-responsiveness to histamine and were considered to be cured. When compared with cured patients, mDCs from patients with persistent disease increased the production of interleukin (IL) 5 and IL-13 by CD4+ T cells, and upregulated programmed death ligand 2 (PD-L2) upon allergen pulsing. In addition, IL-5 and IL-13 responses could be reversed by exogenous IL-12, as well as by PD-L2 blockade. Conclusions This study indicates that pro-Th2 features of mDCs correlate with disease activity in asthma after cessation of exposure to the causal allergen. The findings also highlight that the Th2 programming by dendritic cells is flexible and partly mediated by PD-L2. © 2015 BMJ Publishing Group Ltd & British Thoracic Society.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2015
Language Anglais
Journal information "Thorax : an international journal of respiratory medicine" - Vol. 70, no.10, p. 967-973 (2015)
Peer reviewed yes
Publisher B M J Group ((United Kingdom) London)
issn 0040-6376
e-issn 1468-3296
Publication status Publié
Affiliations UCL - (SLuc) Service de pneumologie
UCL - SSS/IREC/LUNS - Pôle pneumologie, ORL (airways) et dermatologie (skin)
UCL - (MGD) Service de pneumologie
UCL - SSS/IREC/SLUC - Pôle St.-Luc
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Bibliographic reference Froidure, Antoine ; Vandenplas, Olivier ; D'Alpaos, Vinciane ; Evrard, Geneviève ; Pilette, Charles. Persistence of asthma following allergen avoidance is associated with proTh2 myeloid dendritic cell activation. In: Thorax : an international journal of respiratory medicine, Vol. 70, no.10, p. 967-973 (2015)
Permanent URL http://hdl.handle.net/2078.1/165457