Cited by 125Probiotics and Fermented FoodsInfluenza Virus Research StudiesImmune Cell Function and Interaction

Consecutive oral administration of Bifidobacterium longum MM‐2 improves the defense system against influenza virus infection by enhancing natural killer cell activity in a murine model

Kawahara, Tomohiro, Takahashi, Tadanobu, Oishi, Kenta, Tanaka, Hiromu, Masuda, Midori, Takahashi, Shunsaku, Takano, Maiko, Kawakami, Tatsuya +3 more·2015·Microbiology and Immunology

Abstract

Bifidobacterium, one of the major components of intestinal microflora, shows anti‐influenza virus (IFV) potential as a probiotic, partly through enhancement of innate immunity by modulation of the intestinal immune system. Bifidobacterium longum MM‐2 (MM‐2), a very safe bacterium in humans, was isolated from healthy humans and its protective effect against IFV infection in a murine model shown. In mice that were intranasally inoculated with IFV, oral administration of MM‐2 for 17 consecutive days improved clinical symptoms, reduced mortality, suppressed inflammation in the lower respiratory tract, and decreased virus titers, cell death, and pro‐inflammatory cytokines such as IL‐6 and TNF‐α in bronchoalveolar lavage fluid. The anti‐IFV mechanism of MM‐2 involves innate immunity through significant increases in NK cell activities in the lungs and spleen and a significant increase in pulmonary gene expression of NK cell activators such as IFN‐γ, IL‐2, IL‐12 and IL‐18. Even in non‐infected mice, MM‐2 administration also induced significant enhancement of both IFN‐γ production by Peyer's patch cells (PPs) and splenetic NK cell activity. Oral administration of MM‐2 for 17 days activates systemic immunoreactivity in PPs, which contributes to innate immunity, including NK cell activation, resulting in an anti‐IFV effect. MM‐2 as a probiotic may function as a prophylactic agent in the management of an IFV epidemic.

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Crossref · 10.1111/1348-0421.12210

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  • Even in non-infected mice, probiotic administration induced significant enhancement in both IFN-γ production and splenetic NK cell activity.

    “Even in non-infected mice, probiotic administration also induced significant enhancement in both IFN-γ production and splenetic NK cell activity [12].”

    From Gut microbiota-mediated immunomodulation in tumor (2021) · cites this paper as [12]

  • Oral administration with Bifidobacterium longum can exert an anti-influenza virus effect in mice through inducing an increase in NK cell activities and gene expression of IFN-γ, IL-2, IL-12 and IL-18 in the lungs.

    “Kawahara et al. showed that oral administration with Bifidobacterium longum can exert anti-influenza virus effect in mice through inducing an increase in NK cell activities and gene expression of IFN-γ, IL-2, IL-12 and IL-18 in the lungs [12].”

    From Gut microbiota-mediated immunomodulation in tumor (2021) · cites this paper as [12]

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Authors
Kawahara, T., Takahashi, T., Oishi, K., Tanaka, H., Masuda, M., Takahashi, S., Takano, M., Kawakami, T., Fukushima, K., Kanazawa, H., & Suzuki, T.
Affiliations
Shizuoka University (JP)
Corresponding author
Suzuki, Takashi
Venue
Microbiology and Immunology
Publisher
Wiley
Published
2015-01
Volume
59
Issue
1
Pages
1-12
ISSN
  • 0385-5600 (ISSN-L)
  • 1348-0421
OpenAlex
W1692592874
Cited by
125
References
48
Citations by year
2026: 4 · 2025: 3 · 2024: 12 · 2023: 11 · 2022: 19 · 2021: 18 · 2020: 24 · 2019: 7 · 2018: 7 · 2017: 8 · 2016: 7 · 2015: 5
FWCI
9.56
Type
journal article
Language
en
Open access
closed
Locations
  • Microbiology and Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science (26670064, 15H05644, 13J10690)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Health Sciences › Medicine › Epidemiology › Influenza Virus Research Studies
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Cell Function and Interaction
Keywords
probiotics, influenza, natural killer cells, innate immunity, Peyer's patches, interferon-gamma, IL-12, IL-18, interleukin-2, inflammatory cytokines, lower respiratory tract inflammation, oral administration, gut microbiota, prophylaxis
MeSH terms
Administration, Oral, Animals, Bifidobacterium, Disease Models, Animal, Female, Killer Cells, Natural, Lung, Mice, Inbred BALB C, Orthomyxoviridae Infections, Spleen, Sulfalene, Survival Analysis, Cytokines, Probiotics, Gene Expression Profiling, Influenza A Virus, H1N1 Subtype

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