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Osteopontin protects against pneumococcal infection in a murine model of allergic airway inflammation.
- Source :
-
Allergy [Allergy] 2019 Apr; Vol. 74 (4), pp. 663-674. Date of Electronic Publication: 2018 Nov 19. - Publication Year :
- 2019
-
Abstract
- Background: In atopic asthma, chronic Th2-biased inflammation is associated with an increased risk of pneumococcal infection. The anionic phosphoglycoprotein osteopontin (OPN) is highly expressed in asthma and has been ascribed several roles during inflammation. This study aimed to investigate whether OPN affects inflammation and vulnerability to pneumococcal infection in atopic asthma.<br />Methods: House dust mite (HDM) extract was used to induce allergic airway inflammation in both wild-type (Spp1 <superscript>+/+</superscript> ) and OPN knockout (Spp1 <superscript>-/-</superscript> ) C57BL/6J mice, and the airway was then infected with Streptococcus pneumoniae. Parameters reflecting inflammation, tissue injury, and bacterial burden were measured. In addition, samples from humans with allergic asthma were analyzed.<br />Results: Both allergen challenge in individuals with allergic asthma and the intranasal instillation of HDM in mice resulted in increased OPN levels in bronchoalveolar lavage fluid (BALF). More immune cells (including alveolar macrophages, neutrophils, eosinophils, and lymphocytes) and higher levels of proinflammatory cytokines were found in Spp1 <superscript>-/-</superscript> mice than in Spp1 <superscript>+/+</superscript> mice. Moreover, OPN-deficient mice exhibited increased levels of markers reflecting tissue injury. Upon infection with S. pneumoniae, Spp1 <superscript>+/+</superscript> mice with allergic airway inflammation had a significantly lower bacterial burden in both BALF and lung tissue than did Spp1 <superscript>-/-</superscript> mice. Furthermore, Spp1 <superscript>-/-</superscript> mice had higher levels of cytokines and immune cells in BALF than did Spp1 <superscript>+/+</superscript> mice.<br />Conclusion: OPN reduces inflammation, decreases tissue injury, and reduces bacterial loads during concurrent pneumococcal infection and allergic airway inflammation in a murine model. These findings suggest that OPN significantly affects vulnerability to pneumococcal infection in atopic asthma.<br /> (© 2018 EAACI and John Wiley and Sons A/S. Published by John Wiley and Sons Ltd.)
- Subjects :
- Animals
Asthma chemically induced
Asthma microbiology
Bacterial Load drug effects
Bronchoalveolar Lavage Fluid chemistry
Bronchoalveolar Lavage Fluid immunology
Disease Models, Animal
Humans
Inflammation chemically induced
Lung Injury drug therapy
Lung Injury prevention & control
Mice
Mice, Knockout
Osteopontin genetics
Pneumococcal Infections drug therapy
Protective Agents pharmacology
Pyroglyphidae immunology
Asthma complications
Osteopontin pharmacology
Pneumococcal Infections prevention & control
Subjects
Details
- Language :
- English
- ISSN :
- 1398-9995
- Volume :
- 74
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Allergy
- Publication Type :
- Academic Journal
- Accession number :
- 30362569
- Full Text :
- https://doi.org/10.1111/all.13646