An anaerobic in vitro flow model for studying interactions at the gastrointestinal host-microbe interface

Area of Science:

• Microbiology
• Gastroenterology
• Biotechnology

Background:

• In vitro studies of human gut host-microbe interactions are challenging due to differing oxygen requirements.
• Existing models are often complex, hindering experimental data acquisition.

Purpose of the Study:

• To develop a simple in vitro model for culturing anaerobic gut microbiota with human intestinal epithelium.
• To enable long-term co-culture and study of host-microbe interactions under physiological flow.

Main Methods:

• Integration of an anaerobization unit for online media deoxygenation via liquid-to-liquid gas diffusion.
• Co-culture of human intestinal epithelial cells with obligate anaerobic bacteria (Clostridioides difficile, Bacteroides fragilis).
• Maintenance of stable oxygen levels below 1% for several days.

Main Results:

• The model successfully maintains anaerobic conditions for obligate anaerobes co-cultured with human intestinal epithelium.
• Stable low oxygen levels (<1%) were sustained for multiple days without compromising epithelial viability.
• Demonstrated simulation of prolonged C. difficile and B. fragilis colonization and vancomycin treatment persistence.

Conclusions:

• This novel in vitro model simplifies the study of anaerobic gut microbiota and host-microbe interactions.
• It supports long-term co-culture, offering a valuable tool for gut health research and drug efficacy studies.
• The model accurately reflects C. difficile persistence post-antibiotic treatment in a simulated gut environment.