Orally administered Lactobacillus rhamnosus modulates the respiratory immune response triggered by the viral pathogen-associated molecular pattern poly(I:C)

BMC Immunology

Susana Alvarez¹  Haruki Kitazawa²  Gabriela Marranzino¹  Susana Salva¹  Yohsuke Tomosada²  Eriko Chiba²  Julio Villena² 

[1] Laboratory of Clinical and Experimental Biochemistry, Reference Centre for Lactobacilli (CERELA-CONICET), Tucuman, Argentina;Food Immunology Group, Graduate School of Agricultural Science, Tohoku University, Sendai, 981-8555, Japan

关键词: Respiratory tract;    Antiviral immunity;    Poly(I:C);    L. rhamnosus CRL1505;   

Others  :  1077876
DOI  :  10.1186/1471-2172-13-53

 received in 2012-07-11, accepted in 2012-09-12,  发布年份 2012

【 摘 要 】

Background

Some studies have shown that probiotics, including Lactobacillus rhamnosus CRL1505, had the potential to beneficially modulate the outcome of certain bacterial and viral respiratory infections. However, these studies did not determine the mechanism(s) by which probiotics contribute to host defense against respiratory viruses.

Results

In this work we demonstrated that orally administered Lactobacillus rhamnosus CRL1505 (Lr1505) was able to increase the levels of IFN-γ, IL-10 and IL-6 in the respiratory tract and the number of lung CD3⁺CD4⁺IFN-γ⁺ T cells. To mimic the pro-inflammatory and physiopathological consecuences of RNA viral infections in the lung, we used an experimental model of lung inflammation based on the administration of the artificial viral pathogen-associated molecular pattern poly(I:C). Nasal administration of poly(I:C) to mice induced a marked impairment of lung function that was accompanied by the production of pro-inflammatory mediators and inflammatory cell recruitment into the airways. The preventive administration of Lr1505 reduced lung injuries and the production of TNF-α, IL-6, IL-8 and MCP-1 in the respiratory tract after the challenge with poly(I:C). Moreover, Lr1505 induced a significant increase in lung and serum IL-10. We also observed that Lr1505 was able to increase respiratory IFN-γ levels and the number of lung CD3⁺CD4⁺IFN-γ⁺ T cells after poly(I:C) challenge. Moreover, higher numbers of both CD103⁺ and CD11b^high dendritic cells and increased expression of MHC-II, IL-12 and IFN-γ in these cell populations were found in lungs of Lr1505-treated mice. Therefore, Lr1505 treatment would beneficially regulate the balance between pro-inflammatory mediators and IL-10, allowing an effective inflammatory response against infection and avoiding tissue damage.

Conclusions

Results showed that Lr1505 would induce a mobilization of cells from intestine and changes in cytokine profile that would be able to beneficially modulate the respiratory mucosal immunity. Although deeper studies are needed using challenges with respiratory viruses, the results in this study suggest that Lr1505, a potent inducer of antiviral cytokines, may be useful as a prophylactic agent to control respiratory virus infection.

【 授权许可】

   
2012 Villena et al.; licensee BioMed Central Ltd.

【 图 表 】

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