Pseudobutyrivibrio xylanivorans adhesion to epithelial cells

Area of Science:

• Microbiology
• Gastroenterology
• Probiotics Research

Background:

• Pseudobutyrivibrio xylanivorans strain 2 (P. xylanivorans 2) is a ruminal bacterium crucial for plant fiber digestion.
• Bacterial adherence to host epithelium is a key characteristic for probiotic candidates.
• Understanding P. xylanivorans 2 adhesion mechanisms is vital for its potential probiotic applications.

Purpose of the Study:

• To assess the adhesion of P. xylanivorans 2 to SW480 intestinal cells.
• To characterize the adhesion process using advanced microscopy techniques.
• To investigate the ultrastructure of P. xylanivorans 2, including potential novel structures.

Main Methods:

• Co-culturing P. xylanivorans 2 with SW480 cells at varying multiplicities of infection.
• Employing confocal microscopy to visualize bacterial attachment and host cell response (F-actin).
• Utilizing transmission electron microscopy (TEM) for ultrastructural analysis of bacterial-epithelial interactions and bacterial morphology.

Main Results:

• Optimal adhesion of P. xylanivorans 2 to SW480 cells occurred at a multiplicity of infection of 200 CFU/cell.
• Heat-shock treatment indicated that proteinaceous structures mediate bacterial attachment.
• P. xylanivorans 2 binding induced F-actin enrichment on SW480 cells and formed pedestal-like structures; novel bacterial microcompartments were observed within the bacteria.

Conclusions:

• P. xylanivorans 2 utilizes surface proteins to adhere to intestinal epithelial cells, triggering host cell rearrangements.
• The formation of pedestal-like structures suggests a specific interaction mechanism.
• This study provides the first ultrastructural evidence of bacterial microcompartments in the Pseudobutyrivibrio genus.