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Related Experiment Video

Updated: Sep 16, 2025

Enteric Bacterial Invasion Of Intestinal Epithelial Cells In Vitro Is Dramatically Enhanced Using a Vertical Diffusion Chamber Model
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Vancomycin-resistant enterococci utilise antibiotic-enriched nutrients for intestinal colonisation.

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|July 10, 2025
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Summary
This summary is machine-generated.

Antibiotic treatment disrupts the gut, enabling vancomycin-resistant enterococci (VRE) to thrive. Mixtures of short-chain fatty acids, depleted by antibiotics, effectively suppress VRE growth by targeting nutrient utilization and niche occupation.

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Area of Science:

  • Microbiology
  • Gut Microbiome Research
  • Infectious Diseases

Background:

  • Antibiotic use disrupts the gut microbiome, leading to opportunistic infections.
  • Vancomycin-resistant enterococci (VRE) colonize the intestine, serving as a reservoir for infections.
  • Antibiotic-induced gut dysbiosis creates an environment favorable for VRE proliferation.

Purpose of the Study:

  • To investigate how antibiotic treatment alters the gut environment and promotes VRE colonization.
  • To identify specific nutrients and metabolites affected by antibiotics that influence VRE growth.
  • To determine the efficacy of short-chain fatty acids (SCFAs) in suppressing VRE growth and colonization.

Main Methods:

  • Analysis of nutrient and microbial metabolite concentrations in antibiotic-treated versus control fecal microbiomes.
  • In vitro assessment of VRE growth suppression by individual and mixed SCFAs.
  • Characterization of VRE nutrient utilization preferences.
  • Modeling of VRE niche occupation in the antibiotic-treated gut.

Main Results:

  • Antibiotics increase nutrient availability and decrease microbial metabolites in the gut.
  • Individual SCFAs partially inhibit VRE growth, while SCFA mixtures provide near-complete suppression.
  • VRE utilize enriched nutrients as carbon and nitrogen sources, with distinct preferences between Enterococcus faecium and Enterococcus faecalis.
  • E. faecium and E. faecalis occupy overlapping but distinct nutrient-defined niches, supporting co-growth and growth with carbapenem-resistant Enterobacteriaceae.

Conclusions:

  • VRE colonize distinct intestinal niches in antibiotic-treated hosts, driven by nutrient availability and reduced inhibitory metabolites.
  • SCFA mixtures represent a promising therapeutic strategy to combat VRE colonization and infection.
  • Understanding VRE nutrient utilization and niche dynamics is crucial for developing targeted interventions against antibiotic-resistant infections.