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Intranasal administration of Lactobacillus rhamnosus GG protects mice from H1N1 influenza virus infection by regulating respiratory immune responses.

Authors: Harata, G  He, F  Hiruta, N  Kawase, M  Kubota, A  Hiramatsu, M  Yausi, H 
Citation: Harata G, etal., Lett Appl Microbiol. 2010 Jun 1;50(6):597-602. Epub 2010 Mar 29.
Pubmed: (View Article at PubMed) PMID:20438620
DOI: Full-text: DOI:10.1111/j.1472-765X.2010.02844.x

AIMS: To investigate whether intranasal Lactobacillus administration protects host animals from influenza virus (IFV) infection by enhancing respiratory immune responses in a mouse model. METHODS AND RESULTS: After 3 days of intranasal exposure to Lactobacillus rhamnosus GG (LGG), BALB/c mice were infected with IFV A/PR/8/34 (H1N1). Mice treated with LGG showed a lower frequency of accumulated symptoms and a higher survival rate than control mice (P < 0.05). The YAC-1 cell-killing activity of lung cells isolated from mice treated with LGG was significantly greater than those isolated from control mice (P < 0.01). Intranasal administration of LGG significantly increased mRNA expression of interleukin (IL)-1 beta, tumour necrosis factor (TNF) and monocyte chemotactic protein (MCP)-1 (P < 0.01). CONCLUSIONS: These results suggest that intranasal administration of LGG protects the host animal from IFV infection by enhancing respiratory cell-mediated immune responses following up-regulation of lung natural killer (NK) cell activation. SIGNIFICANCE AND IMPACT OF STUDY: We have demonstrated that probiotics might protect host animals from viral infection by stimulating immune responses in the respiratory tract.


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RGD Object Information
RGD ID: 4142822
Created: 2010-09-13
Species: All species
Last Modified: 2010-09-13
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.