Polyethylene glycol influences microbial interactions with intestinal epithelium

Area of Science:

• Gastroenterology
• Microbiology
• Biomedical Engineering

Background:

• Polyethylene glycol (PEG) is a common bowel preparation.
• Emerging evidence suggests PEG may protect the intestinal epithelium from microbial invasion.
• Microbial translocation is a concern in shock and trauma patients.

Purpose of the Study:

• To investigate the effects of low-molecular-weight (LMW) and high-molecular-weight (HMW) PEG on interactions between intestinal epithelial cells and common microbes.
• To assess the potential of PEG in preventing microbial invasion and colonization.

Main Methods:

• In vitro studies using Caco-2 enterocytes and gentamicin protection assays to evaluate bacterial internalization.
• In vitro studies using immunosorbent assays to measure fungal adherence.
• In vivo studies in mice orally inoculated with Escherichia coli, Candida albicans, or Candida glabrata, with PEG administration via drinking water.

Main Results:

• Both LMW and HMW PEG inhibited Escherichia coli internalization by Caco-2 cells.
• Both LMW and HMW PEG reduced adherence of Candida albicans and Candida glabrata to Caco-2 cells.
• In vivo, HMW PEG decreased E. coli cecal colonization, while both LMW and HMW PEG reduced Candida species colonization.

Conclusions:

• PEG demonstrates potential in reducing microbial interactions with the intestinal epithelium.
• PEG may serve as a protective agent against microbial invasion and colonization in the gut.
• Further research into PEG's role in maintaining intestinal barrier integrity is warranted.