Protective effects of surfactant protein D treatment in 1,3-ß-glucan-modulated allergic inflammation.
Am J Physiol Lung Cell Mol Physiol
; 309(11): L1333-43, 2015 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-26432866
ABSTRACT
Surfactant protein D (SP-D) is a pulmonary collectin important in lung immunity. SP-D-deficient mice (Sftpd(-/-)) are reported to be susceptible to ovalbumin (OVA)- and fungal allergen-induced pulmonary inflammation, while treatment with exogenous SP-D has therapeutic effects in such disease models. ß-Glucans are a diverse group of polysaccharides previously suggested to serve as fungal ligands for SP-D. We set out to investigate if SP-D could interact with 1,3-ß-glucan and attenuate allergic pulmonary inflammation in the presence of 1,3-ß-glucan. Allergic airway disease was induced in Sftpd(-/-) and Sftpd(+/+) mice by OVA sensitization and subsequent challenge with OVA, 1,3-ß-glucan, or OVA/1,3-ß-glucan together. Mice in the combined treatment group were further treated with a high dose of recombinant fragment of human SP-D (rfhSP-D). We demonstrated direct interaction between SP-D and 1,3-ß-glucan. OVA-induced mucous cell metaplasia was increased in Sftpd(-/-) mice, supporting previously reported protective effects of endogenous SP-D in allergy. OVA-induced parenchymal CCL11 levels and eosinophilic infiltration in bronchoalveolar lavage were unaffected by 1,3-ß-glucan, but were reversed with rfhSP-D treatment. 1,3-ß-Glucan treatment did, however, induce pulmonary neutrophilic infiltration and increased TNF-α levels in bronchoalveolar lavage, independently of OVA-induced allergy. This infiltration was also reversed by treatment with rfhSP-D. 1,3-ß-Glucan reduced OVA-induced mucous cell metaplasia, T helper 2 cytokines, and IFN-γ production. rfhSP-D treatment further reduced mucous metaplasia and T helper 2 cytokine secretion to background levels. In summary, rfhSP-D treatment resulted in attenuation of both allergic inflammation and 1,3-ß-glucan-mediated neutrophilic inflammation. Our data suggest that treatment with high-dose SP-D protects from mold-induced exacerbations of allergic asthma.
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MEDLINE
Assunto principal:
Substâncias Protetoras
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Proteína D Associada a Surfactante Pulmonar
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Beta-Glucanas
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Hipersensibilidade
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Inflamação
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article