Uncovering bacterial-mammalian cell interactions via single-cell tracking

Area of Science:

• Microbiology
• Cell Biology
• Biophysics

Background:

• Bacterial pathogen-host interactions are complex, with limited understanding of how motility affects antibiotic tolerance and adhesion.
• Developing quantitative microscopy is crucial for predicting bacterial population behavior.

Purpose of the Study:

• To investigate bacterial motility, adhesion, and antibiotic tolerance using single-cell tracking.
• To compare the behavior of Pseudomonas aeruginosa and Escherichia coli on mammalian cell surfaces.

Main Methods:

• Utilized single-cell tracking approaches to analyze bacterial behavior.
• Quantified mean-squared displacement (MSD) and adherence patterns.
• Investigated the impact of genetic mutations, specifically in the fliD gene of P. aeruginosa.

Main Results:

• P. aeruginosa showed complex interactions (adhesion, rotation, swimming) with mammalian cells, unlike E. coli.
• P. aeruginosa had lower MSD values and greater adherence compared to E. coli.
• Deletion of the fliD gene in P. aeruginosa altered displacement patterns, reduced adherence, and decreased antibiotic tolerance.

Conclusions:

• Single-cell tracking is vital for assessing bacterial behavior and guiding interventions.
• Targeting the fliD gene presents a potential therapeutic strategy against P. aeruginosa infections.