Johnson VJ, Yucesoy B, Luster MI. Prevention of IL-1 signaling attenuates airway hyperresponsiveness and inflammation in a murine model of toluene diisocyanate-induced asthma.
J Allergy Clin Immunol 2005;
116:851-8. [PMID:
16210060 DOI:
10.1016/j.jaci.2005.07.008]
[Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2005] [Revised: 06/24/2005] [Accepted: 07/12/2005] [Indexed: 11/19/2022]
Abstract
BACKGROUND
IL-1 is a pleotropic cytokine that has been shown to play a prominent role in asthma induced by large-molecular-weight proteins. Increased IL-1 immunostaining in the submucosa of patients with toluene diisocyanate (TDI)-induced asthma has also been observed, suggesting that this cytokine might also be important in asthma associated with low-molecular-weight chemicals.
OBJECTIVE
We sought to determine the role of IL-1 signaling in airway reactivity and inflammation by using a murine model of TDI-induced asthma.
METHODS
C57BL/6 mice were exposed to TDI by means of vapor inhalation (20 ppb; 4 hours per day, 5 days per week, for 6 weeks) and then challenged 2 weeks later by inhalation with 20 ppb TDI vapor for 1 hour.
RESULTS
Sensitized-challenged mice showed increased airway hyperresponsiveness (AHR), increased levels of TDI-specific IgG1 antibodies, airway epithelial thickening, inflammation consisting of infiltrating lymphocytes and eosinophils, and increased mRNA expression of IL-4, intercellular adhesion molecule 1, and vascular cell adhesion molecule 1 in the lung. Prevention of IL-1 signaling through deletion of the IL-1 receptor type I or administration of neutralizing antibodies to both IL-1beta and IL-1alpha abrogated the development of TDI-induced asthma. A partial reduction in AHR and TDI-specific IgG1 levels was observed in mice administered anti-IL-1beta, whereas anti-IL-1alpha had no effect on either parameter. Antibodies to IL-1beta or IL-1alpha alone blocked airway inflammation and the expression of IL-4 and adhesion molecules in the lung.
CONCLUSIONS
These results suggest that IL-1 signaling is critical for AHR and airway inflammation, with IL-1beta and IL-1alpha having unique and overlapping roles in TDI-induced occupational asthma.
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