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Surface hydrophilicity promotes bacterial twitching motility.

Megan T O'Hara1, Tori M Shimozono1, Keane J Dye1

  • 1Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, USA.

Msphere
|August 28, 2024
PubMed
Summary
This summary is machine-generated.

Bile salts enhance bacterial twitching motility by altering surface properties, not by inducing stress. This finding is crucial for understanding how surface characteristics influence the function of type IV pili in bacterial pathogens.

Keywords:
AcinetobacterPseudomonas aeruginosabile saltsdetergentshydrophilicitysurface propertytwitching motility

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Surface Science

Background:

  • Bacterial twitching motility, powered by type IV pili (T4P), is vital for virulence and is often studied using colony expansion assays.
  • The functionality of T4P is critical for many antibiotic-resistant pathogens, making it a target for countermeasures.
  • Previous observations noted that twitching motility of *Acinetobacter* species varied with growth media, with MacConkey agar supporting it better than Luria-Bertani (LB) agar.

Purpose of the Study:

  • To investigate the role of bile salts in modulating bacterial twitching motility.
  • To elucidate the mechanism by which bile salts and other detergents affect T4P-mediated motility.
  • To understand how surface properties influence bacterial colonization and infection by critical pathogens.

Main Methods:

  • Assessing twitching motility of *Acinetobacter nosocomialis*, *Acinetobacter baumannii*, and *Pseudomonas aeruginosa* on different agar media and surfaces.
  • Supplementing Luria-Bertani (LB) agar with bile salts and other detergents to observe effects on twitching.
  • Comparing the effects of detergents with antibiotic-induced stress on twitching motility.
  • Evaluating twitching motility on surfaces with varying hydrophilicity, including glass and treated polystyrene.

Main Results:

  • Bile salts significantly enhanced twitching motility in *A. nosocomialis*, *A. baumannii*, and *P. aeruginosa* when added to LB agar.
  • The stimulatory effect of bile salts on twitching was attributed to altering the physicochemical properties of the twitching surface, specifically reducing hydrophilicity, rather than inducing a physiological stress response.
  • Unlike detergents, antibiotics like polymyxin B did not enhance twitching motility.
  • Bacteria exhibited increased twitching on hydrophilic surfaces (glass, tissue culture-treated polystyrene), and bile salts lost their stimulatory effect on these surfaces.

Conclusions:

  • Bile salts and detergents promote bacterial twitching motility by modifying surface hydrophilicity, not through stress responses.
  • Hydrophilic surfaces inherently support T4P-mediated twitching, independent of detergent additives.
  • Surface properties are critical determinants of T4P functionality, impacting bacterial virulence and colonization on medical implants and host tissues.