Comprehensive multiplexed protein quantitation delineates eosinophilic and neutrophilic experimental asthma
Artikel i vetenskaplig tidskrift, 2014

Background: Improvements in asthma diagnosis and management require deeper understanding of the heterogeneity of the complex airway inflammation. We hypothesise that differences in the two major inflammatory phenotypes of asthma; eosinophilic and neutrophilic asthma, will be reflected in the lung protein expression profile of murine asthma models and can be delineated using proteomics of bronchoalveolar lavage (BAL). Methods: BAL from mice challenged with ovalbumin (OVA/OVA) alone (standard model of asthma, here considered eosinophilic) or OVA in combination with endotoxin (OVA/LPS, model of neutrophilic asthma) was analysed using liquid chromatography coupled to high resolution mass spectrometry, and compared with steroid-treated animals and healthy controls. In addition, conventional inflammatory markers were analysed using multiplexed ELISA (Bio-Plex T assay). Multivariate statistics was performed on integrative proteomic fingerprints using principal component analysis. Proteomic data were complemented with lung mechanics and BAL cell counts. Results: Several of the analysed proteins displayed significant differences between the controls and either or both of the two models reflecting eosinophilic and neutrophilic asthma. Most of the proteins found with mass spectrometry analysis displayed a considerable increase in neutrophilic asthma compared with the other groups. Conversely, the larger number of the inflammatory markers analysed with Bio-Plex T analysis were found to be increased in the eosinophilic model. In addition, major inflammation markers were correlated to peripheral airway closure, while commonly used asthma biomarkers only reflect central inflammation. Conclusion: Our data suggest that the commercial markers we are currently relying on to diagnose asthma subtypes are not giving us comprehensive or specific enough information. The analysed protein profiles allowed to discriminate the two models and may add useful information for characterization of different asthma phenotypes.

Endotoxin

Mass spectrometry

Ovalbumin

Proteomics

Asthma

Inflammation

Bronchoalveolar lavage

Författare

Maria Bergquist

Uppsala universitet

S. Jonasson

Totalförsvarets forskningsinstitut (FOI)

J. Hjoberg

AstraZeneca AB

Göran Hedenstierna

Uppsala universitet

Jörg Hanrieder

Chalmers, Kemi- och bioteknik, Analytisk kemi

BMC Pulmonary Medicine

1471-2466 (ISSN)

Vol. 14 Art. no. 110- 110

Ämneskategorier

Analytisk kemi

DOI

10.1186/1471-2466-14-110