Abstract
Aim:
The hygiene hypothesis suggests a lack of bacterial infections would favor the development of allergic diseases. Mycobacterium bovis bacille Calmette–Guérin (BCG) infection can inhibit allergen-induced asthma reactions, but the underlying mechanism of this infection on the immunological responses is unclear. T-regulatory (Treg) cells are thought to play a role as a crucial immunoregulatory cells that are capable of regulating adaptive immune responses. We conducted this study to investigate whether the protective effect of the BCG vaccination on allergic pulmonary inflammation is associated with the alteration of CD4+CD25+ Treg cells in a murine asthma model and the mechanisms of Treg cells.
Methods:
Newborn C57BL/6 mice were vaccinated 3 times with BCG on d 0, 7, and 14 and subsequently sensitized and challenged with ovalbumin. Eosinophil infiltration was investigated. The frequencies of spleen CD4+CD25+ Treg cells and the expression of specific transcriptional factor Foxp3 were assayed. The cytotoxic lymphocyte associated antigen (CTLA)-4 expression and cytokine interleukin-10 (IL-10) and transforming growth factor-β (TGF-β) levels were measured.
Results:
We showed that treatment of mice with BCG inhibited de novo allergic inflammatory response in a mouse model of asthma. BCG treatments are associated with the increase of CD4+CD25+ Treg cells and Foxp3 expression, accompanied by an increased CTLA-4 expression and cytokine IL-10 and TGF-β levels (P<0.05).
Conclusion:
Neonatal BCG vaccinations ameliorate de novo local eosinophilic inflammation induced by allergen and increase the numbers of CD4+CD25+ Treg cells and Foxp3 expression. The cell–cell contact inhibition and regulatory cytokine production may be involved in the regulatory mechanism.
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Acknowledgements
Project supported by the key programs of the Ministry of Health (WKJ2005-2-039), the key programs of Natural Science Foundation of Zhejiang Province in China (No 2007C24012) and High-level Innovation Personnel Project of Department of Health of Zhejiang Province, China to Hua-hao SHEN.
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Li, Q., Shen, Hh. Neonatal bacillus Calmette–Guérin vaccination inhibits de novo allergic inflammatory response in mice via alteration of CD4+CD25+ T-regulatory cells. Acta Pharmacol Sin 30, 125–133 (2009). https://doi.org/10.1038/aps.2008.3
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DOI: https://doi.org/10.1038/aps.2008.3
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