House dust mite induces direct airway inflammation in vivo: implications for future disease therapy?

• Type: Article in International Scientific Journal
• Date: 2010

Authors

De Alba, J (Author) Other; Raemdonck, K (Author) Other; Dekkak, A (Author) Other; Collins, M (Author) Other; Wong, S (Author) Other; Nials, AT (Author) Other; Knowles, RG (Author) Other; Belvisi, MG (Author) Other; Birrell, MA (Author) Other

Journal

Title: European Respiratory Journal

Vol. 35

Pages: 1377-1387

ISSN: 0903-1936

Publisher: European Respiratory Society

Indexing

ISI Web of Knowledge - 33 Citations

Scopus - 34 Citations

Other information

Authenticus ID: P-00M-WNY

DOI: 10.1183/09031936.00022908

Abstract (EN): House dust mite (HDM) is the major source of allergen in house dust and is strongly associated with the development of asthma. HDM can evoke a direct, nonallergic inflammatory reaction in vitro. We aimed to determine whether this apparent nonallergic, inflammatory response can be observed in a more complex in vivo setting. Vehicle, Alum (TM) or HDM (Dermatophagoides pteronyssinus 5 mu g, i.p. with Alum) sensitised Brown-Norway rats were challenged intratracheally with vehicle (saline), HDM (Der p 10 mu g) or heat-inactivated HDM on day 21. Lung function changes and the associated inflammatory response were evaluated. Tissue and bronchoalveolar lavage from Alum (TM) sensitised Der p challenged animals exhibited strong eosinophilia and neutrophilia associated with an early release of pro-inflammatory cytokines (interleukin-13 and 1 beta, eotaxin and thymus and activation-regulated chemokine). This response was not attenuated by removal of HDM-associated protease activity. Interestingly, the vehicle sensitised group (no Alum (TM)) lacked this inflammatory response. HDM allergen evokes nonallergic airways inflammation with an inflammatory profile similar to that of the asthmatic airway. This response, independent of the protease activity of the HDM extract, appeared to be linked to prior administration of the adjuvant Alum (TM) and the subsequent increase in total immunoglobulin E. This finding could have important implications in the development of future asthma therapies.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11