Interplay among Resistance Profiles, High-Risk Clones, and Virulence in the Caenorhabditis elegans Pseudomonas aeruginosa Infection Model

Antimicrob Agents Chemother. 2017 Nov 22;61(12):e01586-17. doi: 10.1128/AAC.01586-17. Print 2017 Dec.

Abstract

The increasing prevalence of nosocomial infections produced by multidrug-resistant (MDR) or extensively drug-resistant (XDR) Pseudomonas aeruginosa is frequently linked to widespread international strains designated high-risk clones. In this work, we attempted to decipher the interplay between resistance profiles, high-risk clones, and virulence, testing a large (n = 140) collection of well-characterized P. aeruginosa isolates from different sources (bloodstream infections, nosocomial outbreaks, cystic fibrosis, and the environment) in a Caenorhabditis elegans infection model. Consistent with previous data, we documented a clear inverse correlation between antimicrobial resistance and virulence in the C. elegans model. Indeed, the lowest virulence was linked to XDR profiles, which were typically linked to defined high-risk clones. However, virulence varied broadly depending on the involved high-risk clone; it was high for sequence type 111 (ST111) and ST235 but very low for ST175. The highest virulence of ST235 could be attributed to its exoU+ type III secretion system (TTSS) genotype, which was found to be linked with higher virulence in our C. elegans model. Other markers, such as motility or pigment production, were not essential for virulence in the C. elegans model but seemed to be related with the higher values of the statistical normalized data. In contrast to ST235, the ST175 high-risk clone, which is widespread in Spain and France, seems to be associated with a particularly low virulence in the C. elegans model. Moreover, the previously described G154R AmpR mutation, prevalent in ST175, was found to contribute to the reduced virulence, although it was not the only factor involved. Altogether, our results provide a major step forward for understanding the interplay between P. aeruginosa resistance profiles, high-risk clones, and virulence.

Keywords: Caenorhabditis elegans; Pseudomonas aeruginosa; extensively drug resistant; high-risk clones; multidrug resistant; virulence.

MeSH terms

  • Animals
  • Anti-Bacterial Agents / pharmacology
  • Bacteremia / microbiology
  • Bacteremia / pathology
  • Bacterial Proteins / genetics*
  • Bacterial Proteins / metabolism
  • Caenorhabditis elegans / microbiology*
  • Clone Cells
  • Cross Infection / microbiology
  • Cross Infection / pathology
  • Disease Models, Animal
  • Drug Resistance, Multiple, Bacterial / genetics*
  • Genotype
  • Humans
  • Microbial Sensitivity Tests
  • Pseudomonas Infections / microbiology
  • Pseudomonas Infections / pathology
  • Pseudomonas aeruginosa / drug effects
  • Pseudomonas aeruginosa / genetics*
  • Pseudomonas aeruginosa / isolation & purification
  • Pseudomonas aeruginosa / pathogenicity
  • Type III Secretion Systems / genetics*
  • Type III Secretion Systems / metabolism
  • Virulence

Substances

  • Anti-Bacterial Agents
  • Bacterial Proteins
  • Type III Secretion Systems
  • AmpR protein, Bacteria