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Surfactant protein D inhibits early airway response in Aspergillus fumigatus-sensitized mice

: Erpenbeck, V.J.; Ziegert, M.; Cavalet-Blanco, D.; Martin, C.; Bälder, R.; Glaab, T.; Braun, A.; Steinhilber, W.; Luettig, B.; Uhlig, S.; Hoymann, H.G.; Krug, N.; Hohlfeld, J.M.


Clinical & experimental allergy 36 (2006), Nr.7, S.930-940
ISSN: 0954-7894
ISSN: 0960-2178
Fraunhofer ITEM ()
allergic inflammation; lung function; collectin; Asthma; pulmonary surfactant

BACKGROUND: The surfactant protein SP-D has been reported to reduce bronchial hyper-responsiveness, blood eosinophilia, and T-helper type 2 cytokines in models of allergic asthma. However, little is known about the functional effect of SP-D on the early airway response upon allergen inhalation, which is an important feature of this disease. OBJECTIVE: We investigated whether SP-D is able to reduce the immediate allergen-induced mediator release and the early bronchial obstruction in addition to its effects on airway inflammation and bronchial hyperresponsiveness in an Aspergillus fumigatus mouse asthma model. METHODS: A. fumigatus-sensitized mice were treated with a recombinant fragment of human SP-D or placebo. Lung functions were measured in orotracheally intubated, spontaneously breathing animals using body plethysmography. In addition, passively sensitized precision-cut lung slices (PCLS) were used to determine the effect of SP-D on allergen-induced histamine release. RESULTS: SP-D inhibited the allergen-induced early airway response and reduced airway hyperresponsiveness compared with placebo. Eosinophilia in bronchoalveolar lavage and lung tissue was reduced after SP-D treatment, possibly by reducing eotaxin levels in the lung. Furthermore, SP-D treatment reduced the allergen-induced histamine release from PCLS. CONCLUSION: These data suggest that SP-D not only reduces allergen-induced eosinophilic inflammation and airway hyperresponsiveness but also provides protection against early airway obstruction by inhibition of early mediator release.