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Enteric Bacterial Invasion Of Intestinal Epithelial Cells In Vitro Is Dramatically Enhanced Using a Vertical Diffusion Chamber Model
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How enteric pathogens know they hit the sweet spot.

Israel Alvarado1, Ernesto Abel-Santos

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Antibiotics disrupt the gut microbiota, allowing pathogens like Salmonella and C. difficile to thrive. Commensal bacteria release host sugars, which fuel the expansion of these dangerous enteric pathogens.

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Area of Science:

  • Microbiology
  • Gastroenterology
  • Immunology

Background:

  • The human gut microbiota is crucial for host health.
  • Antibiotic use can disrupt this protective microbial community.
  • Enteric pathogens exploit disruptions to cause infections.

Purpose of the Study:

  • To identify signals enabling enteric pathogens to colonize hosts after antibiotic treatment.
  • To understand the mechanism by which gut microbiota alterations promote pathogen expansion.

Main Methods:

  • Investigated the role of host-derived sugars in pathogen growth.
  • Examined the interaction between commensal bacteria, host mucus, and enteric pathogens.
  • Utilized Salmonella typhimurium and Clostridium difficile infection models.

Main Results:

  • Commensal bacteria liberate host-specific sugars from intestinal mucus.
  • These liberated sugars promote the post-antibiotic expansion of Salmonella typhimurium and Clostridium difficile.
  • Antibiotic-induced microbiota changes enable pathogens to utilize symbiotic functions.

Conclusions:

  • Host sugars released by commensal bacteria are key signals for pathogen expansion after antibiotic treatment.
  • Disruption of the gut microbiome by antibiotics creates a niche for pathogens.
  • Understanding these mechanisms can inform strategies to prevent antibiotic-associated infections.