Anti-Influenza virus effects of Enterococcus faecalis KH2 and Lactobacillus plantarum SNK12 RNA

Bacterial RNA has recently emerged as an immune-stimulating factor during viral infection. The immune response in an organism is directly related to the progression of virus infections. Lactic acid bacteria in particular have anticancer, bioprotective, and antiallergic effects by modulating immunity...

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Bibliographic Details
Published in:Bioscience of Microbiota, Food and Health Food and Health, 2021, Vol.40(1), pp.43-49
Main Authors: WATANABE, Takumi, HAYASHI, Kyoko, KAN, Tatsuhiko, OHWAKI, Makoto, KAWAHARA, Toshio
Format: Article
Language:English
Subjects:
Antibodies
Anticancer properties
Bacteria
bacterial RNA
Cytokines
E. faecalis
Enterococcus faecalis
Immune response
Immune system
Infections
Inflammation
Influenza
Influenza A
influenza virus
Interleukin 12
L. plantarum
Lactic acid
Lactic acid bacteria
Lactobacilli
Lactobacillus plantarum
Oral administration
Phylogeny
Ribonuclease
Ribonucleic acid
RNA
viral infection
Viral infections
Viruses
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Summary:Bacterial RNA has recently emerged as an immune-stimulating factor during viral infection. The immune response in an organism is directly related to the progression of virus infections. Lactic acid bacteria in particular have anticancer, bioprotective, and antiallergic effects by modulating immunity. Here, we aimed to demonstrate the effect of bacterial RNA on in vitro production of IL-12, a proinflammatory cytokine, and on in vivo activity against influenza A virus (IFV) infection. Oral administration of heat-killed Enterococcus faecalis KH2 (KH2) or Lactobacillus plantarum SNK12 (SNK) in IFV-infected mice suppressed viral replication and stimulated production of virus-specific antibodies. However, ribonuclease-treated KH2 or SNK abrogated the effect, reducing IL-12 production in vitro and anti-IFV effects in vivo. Taken together, KH2 or SNK showed antiviral effects in vivo when administered orally, and the RNAs of KH2 and SNK play a part in these effects, despite the phylogenetic differences between the bacteria.
ISSN:2186-3342
2186-6953
2186-3342
DOI:10.12938/bmfh.2020-019