Biogeography of the Relationship between the Child Gut Microbiome and Innate Immune System.

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  • Additional Information
    • Source:
      Publisher: American Society for Microbiology Country of Publication: United States NLM ID: 101519231 Publication Model: Electronic Cited Medium: Internet ISSN: 2150-7511 (Electronic) NLM ISO Abbreviation: mBio Subsets: MEDLINE
    • Publication Information:
      Original Publication: Washington, D.C. : American Society for Microbiology
    • Subject Terms:
      Immune System*; Bacteria/*classification ; Gastrointestinal Microbiome/*immunology ; Host Microbial Interactions/*immunology; Animals ; Biodiversity ; Canada ; Child, Preschool ; Cytokines/metabolism ; Fecal Microbiota Transplantation ; Feces/microbiology ; Female ; Gastrointestinal Microbiome/physiology ; Germ-Free Life ; Humans ; Immunity, Innate ; Infant ; Male ; Phylogeography ; Toll-Like Receptor 2
    • Abstract:
      The gut microbiome is a well-recognized modulator of host immunity, and its compositions differ between geographically separated human populations. Systemic innate immune responses to microbial derivatives also differ between geographically distinct human populations. However, the potential role of the microbiome in mediating geographically varied immune responses is unexplored. We here applied 16S amplicon sequencing to profile the stool microbiome and, in parallel, measured whole-blood innate immune cytokine responses to several pattern recognition receptor (PRR) agonists among 2-year-old children across biogeographically diverse settings. Microbiomes differed mainly between high- and low-resource environments and were not strongly associated with other demographic factors. We found strong correlations between responses to Toll-like receptor 2 (TLR2) and relative abundances of Bacteroides and Prevotella populations, shared among Canadian and Ecuadorean children. Additional correlations between responses to TLR2 and bacterial populations were specific to individual geographic cohorts. As a proof of concept, we gavaged germfree mice with human donor stools and found murine splenocyte responses to TLR stimulation were consistent with responses of the corresponding human donor populations. This study identified differences in immune responses correlating to gut microbiomes across biogeographically diverse settings and evaluated biological plausibility using a mouse model. This insight paves the way to guide optimization of population-specific interventions aimed to improve child health outcomes. IMPORTANCE Both the gut microbiome and innate immunity are known to differ across biogeographically diverse human populations. The gut microbiome has been shown to directly influence systemic immunity in animal models. With this, modulation of the gut microbiome represents an attractive avenue to improve child health outcomes associated with altered immunity using population-specific approaches. However, there are very scarce data available to determine which members of the gut microbiome are associated with specific immune responses and how these differ around the world, creating a substantial barrier to rationally designing such interventions. This study addressed this knowledge gap by identifying relationships between distinct bacterial taxa and cytokine responses to specific microbial agonists across highly diverse settings. Furthermore, we provide evidence that immunomodulatory effects of region-specific stool microbiomes can be partially recapitulated in germfree mice. This is an important contribution toward improving global child health by targeting the gut microbiome.
      (Copyright © 2021 Amenyogbe et al.)
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    • Grant Information:
      United Kingdom WT_ Wellcome Trust; PJT-148781 Canada CIHR; CMF-108029 Canada CIHR; 088862/Z/09/Z United Kingdom WT_ Wellcome Trust
    • Contributed Indexing:
      Keywords: biogeography; gut microbiome; innate immunity
    • Accession Number:
      0 (Cytokines)
      0 (TLR2 protein, human)
      0 (Toll-Like Receptor 2)
    • Publication Date:
      Date Created: 20210113 Date Completed: 20210907 Latest Revision: 20210907
    • Publication Date:
      20221213
    • Accession Number:
      PMC7845628
    • Accession Number:
      10.1128/mBio.03079-20
    • Accession Number:
      33436437