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Cysteamine Inhibits Glycine Utilisation and Disrupts Virulence in Pseudomonas aeruginosa

Douglas J Fraser-Pitt1, Stephen K Dolan2, David Toledo-Aparicio1

  • 1NovaBiotics Ltd, Aberdeen, United Kingdom.

Frontiers in Cellular and Infection Microbiology
|October 11, 2021
PubMed

Insights

Cysteamine inhibits Pseudomonas aeruginosa

Area of Science:

  • Microbiology
  • Pathogen Research
  • Drug Discovery

Background:

  • Pseudomonas aeruginosa is a significant opportunistic pathogen, frequently causing chronic lung infections in cystic fibrosis (CF) patients.
  • P. aeruginosa infections in CF patients often develop antibiotic resistance and mucoid phenotypes.
  • Cysteamine, an aminothiol, has shown potential in preventing biofilm formation and enhancing antibiotic efficacy against P. aeruginosa.

Purpose of the Study:

  • To investigate the anti-virulence properties of cysteamine against Pseudomonas aeruginosa.
  • To determine if cysteamine interferes with glycine utilization and virulence factor production in P. aeruginosa.
  • To evaluate the efficacy of cysteamine in a Galleria mellonella infection model.

Main Methods:

  • Assessing cysteamine's effect on glycine utilization in P. aeruginosa.
  • Measuring hydrogen cyanide (HCN) production in the presence of cysteamine.
  • Evaluating cysteamine's impact on P. aeruginosa virulence factors (pyocyanin, pyoverdine, exopolysaccharide) and toxicity in a Galleria mellonella model.

Main Results:

  • Cysteamine was found to inhibit glycine utilization by P. aeruginosa, a novel finding in prokaryotes.
  • Cysteamine significantly reduced hydrogen cyanide (HCN) production, indicating interference with virulence regulation.
  • Cysteamine impaired bacterial chemotaxis, reduced pyocyanin, pyoverdine, and exopolysaccharide production, and decreased secreted factor toxicity in vivo.

Conclusions:

  • Cysteamine exhibits potent anti-virulence properties against Pseudomonas aeruginosa beyond its previously known effects.
  • Cysteamine's inhibition of glycine metabolism and virulence factor synthesis supports its therapeutic potential for CF and other P. aeruginosa infections.
  • Further research into cysteamine as an anti-virulence agent is warranted for clinical applications.

Keywords:
Pseudomonas aeruginosabiofilmglycine cleavage complexnovel therapeuticvirulence

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