Bacterial Swimming and Accumulation on Endothelial Cell Surfaces

Area of Science:

• Microbiology
• Biophysics
• Cell Biology

Background:

• Flagellar motility is crucial for bacterial surface colonization, infection, and contamination.
• Previous studies on bacterial motion near surfaces used simplified models with artificial substrates.
• The behavior of bacteria interacting with living biological surfaces remains poorly understood.

Purpose of the Study:

• To investigate bacterial motion and adhesion dynamics on biological surfaces composed of vascular endothelial cells.
• To compare bacterial behavior on living cellular surfaces versus traditional artificial surfaces.
• To elucidate the physical factors governing bacterial interaction with single-layer cell surfaces.

Main Methods:

• Experimental investigation of bacterial swimming and adhesion.
• Utilized vascular endothelial cells as biological surfaces.
• Analyzed bacterial motion patterns, including radii of circular motion and adhesion modes.

Main Results:

• Bacterial trapping on inorganic surfaces was contrasted by reduced circular motion radii on cellular surfaces.
• Identified two distinct bacterial adhesion modes: tight and loose.
• Living cells enhanced bacterial surface enrichment, intensified by flow through bias-swimming.

Conclusions:

• Physical effects are the dominant regulators of bacterial motility and accumulation at the single-cell-layer level in vitro.
• Findings bridge simplified hydrodynamic models and complex biological interactions.
• Results have implications for understanding biofilm formation and bacterial contamination on living tissues.