Comparing In Vitro Faecal Fermentation Methods as Surrogates for Phage Therapy Application

Area of Science:

• Microbiology
• Virology
• Gastroenterology

Background:

• The human gut microbiome plays a crucial role in health and disease.
• Bacteriophages (phages) are bacterial viruses abundant in the gut microbiome.
• Disruptions in gut microbial composition are linked to intestinal diseases.

Purpose of the Study:

• To develop and compare in vitro fecal fermentation systems as surrogates for the human colon.
• To investigate the impact of bacteriophage introduction on bacterial and viral gut communities.
• To assess the suitability of simple 50 mL tubes for short-term phage-bacteria interaction studies.

Main Methods:

• Development of in vitro fecal fermentation systems.
• Introduction of a high-titer single phage preparation into fermentation systems.
• Analysis of bacterial and viral composition changes over 24 hours.
• Comparison of data from simple 50 mL tubes and sophisticated fermenters.

Main Results:

• In vitro fermentation systems were established as surrogates for the human colon.
• Significant changes in bacterial and viral composition were observed after phage introduction.
• 50 mL plastic tubes provided data comparable to advanced fermenter systems within 24 hours.
• The presence or absence of a bacterial host influenced phage impact.

Conclusions:

• Simple in vitro systems can effectively model short-term bacteriophage dynamics in the gut.
• This research provides a foundation for understanding bacteriophage transplants in human recipients.
• Further studies can utilize these methods to explore phage therapy and gut microbiome modulation.