Bacillus Calmette-Guerin Suppresses Asthmatic Responses via CD4+CD25+ Regulatory T Cells and Dendritic Cells.
10.4168/aair.2014.6.3.201
- Author:
Young Joon KIM
1
;
Ha Jung KIM
;
Mi Jin KANG
;
Ho Sung YU
;
Ju Hee SEO
;
Hyung Young KIM
;
Seoung Ju PARK
;
Yong Chul LEE
;
Soo Jong HONG
Author Information
1. Asan Institute for Life Sciences, University of Ulsan College of Medicine, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
BCG;
dendritic cells;
T-lymphocytes, regulatory;
asthma;
allergic inflammation;
mouse
- MeSH:
Animals;
Asthma;
Bacillus*;
Bronchoalveolar Lavage;
Dendritic Cells*;
Eosinophils;
Immunoglobulin E;
Immunoglobulin G;
Inflammation;
Lung;
Mice;
Mycobacterium bovis;
Ovalbumin;
T-Lymphocytes, Regulatory*
- From:Allergy, Asthma & Immunology Research
2014;6(3):201-207
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: Bacillus Calmette-Guerin (BCG) is known to suppress the asthmatic responses in a murine model of asthma and to induce dendritic cells (DCs) maturation. Mature DCs play a crucial role in the differentiation of regulatory T cells (Tregs), which are known to regulate allergic inflammatory responses. To investigate whether BCG regulates Tregs in a DCs-mediated manner, we analyzed in a murine model of asthma. METHODS: BALB/c mice were injected intraperitoneally with BCG or intravenously with BCG-stimulated DCs and then sensitized and challenged with ovalbumin (OVA). Mice were analysed for bronchial hyperresponsiveness (BHR), the influx of inflammatory cells in the bronchoalveolar lavage (BAL) fluid, and histopathological changes in the lung. To identify the mechanisms, IgE, IgG1 and IgG2a in the serum were analysed and the CD25+ Tregs in the mice were depleted with anti-CD25 monoclonal antibody (mAb). RESULTS: BCG and the transfer of BCG-stimulated DCs both suppressed all aspects of the asthmatic responses, namely, BHR, the production of total IgE and OVA-specific IgE and IgGs, and pulmonary eosinophilic inflammation. Anti-CD25mAb treatment reversed these effects. CONCLUSIONS: BCG can attenuate the allergic inflammation in a mouse model of asthma by a Tregs-related mechanism that is mediated by DCs.
