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Research Article | Host-Microbe Biology

Dietary Xanthan Gum Alters Antibiotic Efficacy against the Murine Gut Microbiota and Attenuates Clostridioides difficile Colonization

Matthew K. Schnizlein, Kimberly C. Vendrov, Summer J. Edwards, Eric C. Martens, Vincent B. Young
Katherine McMahon, Editor
Matthew K. Schnizlein
aDepartment of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
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Kimberly C. Vendrov
bDepartment of Internal Medicine, Division of Infectious Diseases, University of Michigan, Ann Arbor, Michigan, USA
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Summer J. Edwards
bDepartment of Internal Medicine, Division of Infectious Diseases, University of Michigan, Ann Arbor, Michigan, USA
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Eric C. Martens
aDepartment of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
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Vincent B. Young
aDepartment of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
bDepartment of Internal Medicine, Division of Infectious Diseases, University of Michigan, Ann Arbor, Michigan, USA
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Katherine McMahon
University of Wisconsin—Madison
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DOI: 10.1128/mSphere.00708-19
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ABSTRACT

Dietary fiber provides a variety of microbiota-mediated benefits ranging from anti-inflammatory metabolites to pathogen colonization resistance. A healthy gut microbiota protects against Clostridioides difficile colonization. Manipulation of these microbes through diet may increase colonization resistance to improve clinical outcomes. The primary objective of this study was to identify how the dietary fiber xanthan gum affects the microbiota and C. difficile colonization. We added 5% xanthan gum to the diet of C57BL/6 mice and examined its effect on the microbiota through 16S rRNA gene amplicon sequencing and short-chain fatty acid analysis. Following either cefoperazone or an antibiotic cocktail administration, we challenged mice with C. difficile and measured colonization by monitoring the CFU. Xanthan gum administration is associated with increases in fiber-degrading taxa and short-chain fatty acid concentrations. However, by maintaining both the diversity and absolute abundance of the microbiota during antibiotic treatment, the protective effects of xanthan gum administration on the microbiota were more prominent than the enrichment of these fiber-degrading taxa. As a result, mice that were on the xanthan gum diet experienced limited to no C. difficile colonization. Xanthan gum administration alters mouse susceptibility to C. difficile colonization by maintaining the microbiota during antibiotic treatment. While antibiotic-xanthan gum interactions are not well understood, xanthan gum has previously been used to bind drugs and alter their pharmacokinetics. Thus, xanthan gum may alter the activity of the oral antibiotics used to make the microbiota susceptible. Future research should further characterize how this and other common dietary fibers interact with drugs.

IMPORTANCE A healthy gut bacterial community benefits the host by breaking down dietary nutrients and protecting against pathogens. Clostridioides difficile capitalizes on the absence of this community to cause diarrhea and inflammation. Thus, a major clinical goal is to find ways to increase resistance to C. difficile colonization by either supplementing with bacteria that promote resistance or a diet to enrich for those already present in the gut. In this study, we describe an interaction between xanthan gum, a human dietary additive, and the microbiota resulting in an altered gut environment that is protective against C. difficile colonization.

  • Copyright © 2020 Schnizlein et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Dietary Xanthan Gum Alters Antibiotic Efficacy against the Murine Gut Microbiota and Attenuates Clostridioides difficile Colonization
Matthew K. Schnizlein, Kimberly C. Vendrov, Summer J. Edwards, Eric C. Martens, Vincent B. Young
mSphere Jan 2020, 5 (1) e00708-19; DOI: 10.1128/mSphere.00708-19

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Dietary Xanthan Gum Alters Antibiotic Efficacy against the Murine Gut Microbiota and Attenuates Clostridioides difficile Colonization
Matthew K. Schnizlein, Kimberly C. Vendrov, Summer J. Edwards, Eric C. Martens, Vincent B. Young
mSphere Jan 2020, 5 (1) e00708-19; DOI: 10.1128/mSphere.00708-19
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KEYWORDS

Clostridioides difficile
dietary fiber
microbial ecology
xanthan gum

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