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IL-12 contributes to allergen-induced airway inflammation in experimental asthma.
- Source :
-
Journal of immunology (Baltimore, Md. : 1950) [J Immunol] 2006 Nov 01; Vol. 177 (9), pp. 6460-70. - Publication Year :
- 2006
-
Abstract
- Lack of sufficient IL-12 production has been suggested to be one of the basic underlying mechanisms in atopy, but a potential role of IL-12 in established allergic airway disease remains unclear. We took advantage of a mouse model of experimental asthma to study the role of IL-12 during the development of bronchial inflammation. Administration of anti-IL-12p35 or anti-IL-12p40 mAb to previously OVA-sensitized BALB/c mice concomitantly with exposure to nebulized OVA, abolished both the development of bronchial hyperresponsiveness to metacholine as well as the eosinophilia in bronchoalveolar lavage fluid and peripheral blood. Anti-IL-12 treatment reduced CD4(+) T cell numbers and IL-4, IL-5, and IL-13 levels in the bronchoalveolar lavage fluid and the mRNA expression of IL-10, eotaxin, RANTES, MCP-1, and VCAM-1 in the lung. Anti-IL-12p35 treatment failed to show these effects in IFN-gamma knockout mice pointing to the essential role of IFN-gamma in IL-12-induced effects. Neutralization of IL-12 during the sensitization process aggravated the subsequent development of allergic airway inflammation. These data together with recent information on the role of dendritic cells in both the sensitization and effector phase of allergic respiratory diseases demonstrate a dual role of IL-12. Whereas IL-12 counteracts Th2 sensitization, it contributes to full-blown allergic airway disease upon airway allergen exposure in the postsensitization phase, with enhanced recruitment of CD4(+) T cells and eosinophils and with up-regulation of Th2 cytokines, chemokines, and VCAM-1. IFN-gamma-producing cells or cells dependent on IFN-gamma activity, play a major role in this unexpected proinflammatory effect of IL-12 in allergic airway disease.
- Subjects :
- Allergens immunology
Animals
Antibodies, Monoclonal pharmacology
Asthma genetics
Asthma pathology
Bronchoalveolar Lavage Fluid chemistry
CD4-Positive T-Lymphocytes drug effects
CD4-Positive T-Lymphocytes immunology
Chemokines analysis
Chemokines genetics
Chemokines metabolism
Disease Models, Animal
Inflammation genetics
Inflammation immunology
Inflammation pathology
Interferon-gamma genetics
Interleukin-12 antagonists & inhibitors
Interleukin-12 Subunit p35 antagonists & inhibitors
Interleukin-12 Subunit p40 antagonists & inhibitors
Interleukins analysis
Interleukins genetics
Interleukins metabolism
Lung chemistry
Lung pathology
Mice
Mice, Inbred BALB C
Mice, Knockout
Ovalbumin immunology
Pneumonia genetics
Pneumonia pathology
RNA, Messenger analysis
RNA, Messenger metabolism
Vascular Cell Adhesion Molecule-1 analysis
Vascular Cell Adhesion Molecule-1 genetics
Vascular Cell Adhesion Molecule-1 metabolism
Asthma immunology
Interferon-gamma physiology
Interleukin-12 physiology
Lung immunology
Pneumonia immunology
Subjects
Details
- Language :
- English
- ISSN :
- 0022-1767
- Volume :
- 177
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Journal of immunology (Baltimore, Md. : 1950)
- Publication Type :
- Academic Journal
- Accession number :
- 17056578
- Full Text :
- https://doi.org/10.4049/jimmunol.177.9.6460