A Novel Immunobiotics Bacteroides dorei Ameliorates Influenza Virus Infection in Mice

• Published in: Frontiers in immunology Vol. 12; p. 828887
• Main Authors: Song, Liqiong, Huang, Yuanming, Liu, Guoxing, Li, Xianping, Xiao, Yuchun, Liu, Chang, Zhang, Yue, Li, Jintong, Xu, Jianguo, Lu, Shan, Ren, Zhihong
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Media S.A 26.01.2022
• Subjects: Animals; B. dorei; Bacteroides - immunology; Biomarkers; Brain-Gut Axis - immunology; cytokines; Cytokines - blood; Cytokines - metabolism; Disease Models, Animal; Female; Gastrointestinal Microbiome - immunology; gut microbiota; Host-Pathogen Interactions - immunology; Immunology; Immunomodulation; influenza; Influenza A virus - physiology; interferon; Interferons - metabolism; Metagenome; Metagenomics - methods; Mice; Microbial Interactions - immunology; Orthomyxoviridae Infections - immunology; Orthomyxoviridae Infections - metabolism; Orthomyxoviridae Infections - pathology; Orthomyxoviridae Infections - virology; Probiotics; Quercetin - metabolism; Viral Load; influenza; cytokines; B. dorei; interferon; gut microbiota
• ISSN: 1664-3224; 1664-3224
• DOI: 10.3389/fimmu.2021.828887

Probiotics can modulate immune responses to resist influenza infection. This study aims to evaluate the anti-viral efficacy of . C57BL/6J mice were infected with influenza virus together with treatment of PBS vehicle, , or oseltamivir respectively. Anti-influenza potency of and the underlying mechanism were determined by measuring survival rate, lung viral load and pathology, gene expression and production of cytokines and chemokines, and analysis of gut microbiota. Administration of increased (by 30%) the survival of influenza-infected mice, and improved their weight loss, lung pathology, lung index, and colon length compared to the vehicle control group. treatment reduced (by 61%) the viral load of lung tissue and increased expression of type 1 interferon more rapidly at day 3 postinfection. At day 7 postinfection, dorei-treated mice showed lower local (lung) and systemic (serum) levels of interferon and several proinflammatory cytokines or chemokines (IL-1β, IL-6, TNF-α, IL-10, MCP-1 and IP-10) with a efficacy comparable to oseltamivi treatment. treatment also altered gut microbiota as indicated by increased levels of Bacteroides, Prevotella, and Lactobacillus and decreased levels of Escherichia, Shigella, and Parabacteroides. has anti-influenza effect. Its working mechanisms involve promoting earlier interferon expression and down-regulating both local and systemic inflammatory response. changes the composition of gut microbiota, which may also contribute to its beneficial effects.