Register      Login
Microbiology Australia Microbiology Australia Society
Microbiology Australia, bringing Microbiologists together
RESEARCH ARTICLE

Cytotoxic factor influencing acquired antimicrobial resistance in Pseudomonas aeruginosa

Dinesh Subedi A , Ajay Kumar Vijay B , Scott A Rice C and Mark Willcox D
+ Author Affiliations
- Author Affiliations

A School of Optometry and Vision Science, UNSW Sydney, NSW 2052, Australia. Tel: +61 4 1397 3921, Fax: +61 2 9313 6243, Email: d.subedi@unsw.edu.au, subedi.dnes@gmail.com

B School of Optometry and Vision Science, UNSW Sydney, NSW 2052, Australia. Tel: +61 2 9385 4503, Fax: +61 2 9313 6243, Email: v.ajaykumar@unsw.edu.au

C School of Biological Sciences, NTU. Tel: +65 6592 7944, Office: SBS B1N 27, Email: rscott@ntu.edu.sg

D School of Optometry and Vision Science, UNSW Sydney, NSW 2052, Australia. Tel: +61 2 9385 4164, Email: m.willcox@unsw.edu.au

Microbiology Australia 40(4) 161-164 https://doi.org/10.1071/MA19048
Published: 29 October 2019

Abstract

The Gram-negative opportunistic bacterium Pseudomonas aeruginosa is associated with different types of human infections and because of emerging multidrug-resistant strains, these infections are of major global public health concern. Certain strains possess a unique cytotoxic effector protein ExoU, which contributes to the fitness of this organism in different ecological niches and is associated with acquired antibiotic resistance. This article summarises the current knowledge of the exoU gene in P. aeruginosa, including genetics, distribution in strains from different locations and association with antibiotic resistance. Understanding of this effector protein may have important implications for the understanding of pathogenesis and antimicrobial resistance in P. aeruginosa infections.


References

[1]  Hauser, A.R. (2009) The type III secretion system of Pseudomonas aeruginosa: infection by injection. Nat. Rev. Microbiol. 7, 654–665.
The type III secretion system of Pseudomonas aeruginosa: infection by injection.Crossref | GoogleScholarGoogle Scholar | 19680249PubMed |

[2]  Feltman, H. et al. (2001) Prevalence of type III secretion genes in clinical and environmental isolates of Pseudomonas aeruginosa. Microbiology 147, 2659–2669.
Prevalence of type III secretion genes in clinical and environmental isolates of Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 11577145PubMed |

[3]  Fleiszig, S.M. et al. (1997) Pseudomonas aeruginosa-mediated cytotoxicity and invasion correlate with distinct genotypes at the loci encoding exoenzyme S. Infect. Immun. 65, 579–586.
| 9009316PubMed |

[4]  Hauser, A.R. et al. (2002) Type III protein secretion is associated with poor clinical outcomes in patients with ventilator-associated pneumonia caused by Pseudomonas aeruginosa. Crit. Care Med. 30, 521–528.
Type III protein secretion is associated with poor clinical outcomes in patients with ventilator-associated pneumonia caused by Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 11990909PubMed |

[5]  Finck-Barbançon, V. et al. (1997) ExoU expression by Pseudomonas aeruginosa correlates with acute cytotoxicity and epithelial injury. Mol. Microbiol. 25, 547–557.
ExoU expression by Pseudomonas aeruginosa correlates with acute cytotoxicity and epithelial injury.Crossref | GoogleScholarGoogle Scholar | 9302017PubMed |

[6]  Hauser, A.R. et al. (1998) PepA, a secreted protein of Pseudomonas aeruginosa, is necessary for cytotoxicity and virulence. Mol. Microbiol. 27, 807–818.
PepA, a secreted protein of Pseudomonas aeruginosa, is necessary for cytotoxicity and virulence.Crossref | GoogleScholarGoogle Scholar | 9515706PubMed |

[7]  Wolfgang, M.C. et al. (2003) Conservation of genome content and virulence determinants among clinical and environmental isolates of Pseudomonas aeruginosa. Proc. Natl. Acad. Sci. USA 100, 8484–8489.
Conservation of genome content and virulence determinants among clinical and environmental isolates of Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 12815109PubMed |

[8]  Subedi, D. et al. (2018) Comparative genomics of clinical strains of Pseudomonas aeruginosa strains isolated from different geographic sites. Sci. Rep. 8, 15668.
Comparative genomics of clinical strains of Pseudomonas aeruginosa strains isolated from different geographic sites.Crossref | GoogleScholarGoogle Scholar | 30353070PubMed |

[9]  Freschi, L. et al. (2018) Genomic characterisation of an international Pseudomonas aeruginosa reference panel indicates that the two major groups draw upon distinct mobile gene pools. FEMS Microbiol. Lett. 365, fny120.
Genomic characterisation of an international Pseudomonas aeruginosa reference panel indicates that the two major groups draw upon distinct mobile gene pools.Crossref | GoogleScholarGoogle Scholar | 29897457PubMed |

[10]  Boulant, T. et al. (2018) Higher prevalence of PldA, a Pseudomonas aeruginosa trans-kingdom H2-type VI secretion system effector, in clinical isolates responsible for acute infections and in multidrug resistant strains. Front. Microbiol. 9, 2578.
Higher prevalence of PldA, a Pseudomonas aeruginosa trans-kingdom H2-type VI secretion system effector, in clinical isolates responsible for acute infections and in multidrug resistant strains.Crossref | GoogleScholarGoogle Scholar | 30420847PubMed |

[11]  Rutherford, V. et al. (2018) Environmental reservoirs for exoS+ and exoU+ strains of Pseudomonas aeruginosa. Environ. Microbiol. Rep. 10, 485–492.
Environmental reservoirs for exoS+ and exoU+ strains of Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 29687624PubMed |

[12]  Bradbury, R.S. et al. (2010) Virulence gene distribution in clinical, nosocomial and environmental isolates of Pseudomonas aeruginosa. J. Med. Microbiol. 59, 881–890.
Virulence gene distribution in clinical, nosocomial and environmental isolates of Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 20430902PubMed |

[13]  Costerton, J.W. et al. (1999) Bacterial biofilms: a common cause of persistent infections. Science 284, 1318–1322.
Bacterial biofilms: a common cause of persistent infections.Crossref | GoogleScholarGoogle Scholar | 10334980PubMed |

[14]  Choy, M.H. et al. (2008) Comparison of virulence factors in Pseudomonas aeruginosa strains isolated from contact lens- and non-contact lens-related keratitis. J. Med. Microbiol. 57, 1539–1546.
Comparison of virulence factors in Pseudomonas aeruginosa strains isolated from contact lens- and non-contact lens-related keratitis.Crossref | GoogleScholarGoogle Scholar | 19018027PubMed |

[15]  Zhu, H. et al. (2006) Type III secretion system-associated toxins, proteases, serotypes, and antibiotic resistance of Pseudomonas aeruginosa isolates associated with keratitis. Curr. Eye Res. 31, 297–306.
Type III secretion system-associated toxins, proteases, serotypes, and antibiotic resistance of Pseudomonas aeruginosa isolates associated with keratitis.Crossref | GoogleScholarGoogle Scholar | 16603462PubMed |

[16]  Borkar, D.S. et al. (2014) Cytotoxic clinical isolates of Pseudomonas aeruginosa identified during the Steroids for Corneal Ulcers Trial show elevated resistance to fluoroquinolones. BMC Ophthalmol. 14, 54.
Cytotoxic clinical isolates of Pseudomonas aeruginosa identified during the Steroids for Corneal Ulcers Trial show elevated resistance to fluoroquinolones.Crossref | GoogleScholarGoogle Scholar | 24761794PubMed |

[17]  Klockgether, J. et al. (2004) Sequence analysis of the mobile genome island pKLC102 of Pseudomonas aeruginosa. C. J. Bacteriol. 186, 518.
Sequence analysis of the mobile genome island pKLC102 of Pseudomonas aeruginosa. C.Crossref | GoogleScholarGoogle Scholar | 14702321PubMed |

[18]  Stover, C.K. et al. (2000) Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen. Nature 406, 959–964.
Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen.Crossref | GoogleScholarGoogle Scholar | 10984043PubMed |

[19]  Subedi, D. et al. (2019) Accessory genome of the multi-drug resistant ocular isolate of Pseudomonas aeruginosa PA34. PLoS One 14, e0215038.
Accessory genome of the multi-drug resistant ocular isolate of Pseudomonas aeruginosa PA34.Crossref | GoogleScholarGoogle Scholar | 30986237PubMed |

[20]  Lee, D.G. et al. (2006) Genomic analysis reveals that Pseudomonas aeruginosa virulence is combinatorial. Genome Biol. 7, R90.
Genomic analysis reveals that Pseudomonas aeruginosa virulence is combinatorial.Crossref | GoogleScholarGoogle Scholar | 17038190PubMed |

[21]  Kulasekara, B.R. et al. (2006) Acquisition and evolution of the exoU locus in Pseudomonas aeruginosa. J. Bacteriol. 188, 4037–4050.
Acquisition and evolution of the exoU locus in Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 16707695PubMed |

[22]  Treangen, T.J. et al. (2014) The Harvest suite for rapid core-genome alignment and visualization of thousands of intraspecific microbial genomes. Genome Biol. 15, 524.
The Harvest suite for rapid core-genome alignment and visualization of thousands of intraspecific microbial genomes.Crossref | GoogleScholarGoogle Scholar | 25410596PubMed |

[23]  Wong-Beringer, A. et al. (2008) Comparison of type III secretion system virulence among fluoroquinolone-susceptible and -resistant clinical isolates of Pseudomonas aeruginosa. Clin. Microbiol. Infect. 14, 330–336.
Comparison of type III secretion system virulence among fluoroquinolone-susceptible and -resistant clinical isolates of Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 18190571PubMed |

[24]  Cho, H.H. et al. (2014) Correlation between virulence genotype and fluoroquinolone resistance in carbapenem-resistant Pseudomonas aeruginosa. Ann. Lab. Med. 34, 286–292.
Correlation between virulence genotype and fluoroquinolone resistance in carbapenem-resistant Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 24982833PubMed |

[25]  Sawa, T. et al. (2014) Association between Pseudomonas aeruginosa type III secretion, antibiotic resistance, and clinical outcome: a review. Crit. Care 18, 668.
Association between Pseudomonas aeruginosa type III secretion, antibiotic resistance, and clinical outcome: a review.Crossref | GoogleScholarGoogle Scholar | 25672496PubMed |

[26]  Lakkis, C. and Fleiszig, S.M. (2001) Resistance of Pseudomonas aeruginosa isolates to hydrogel contact lens disinfection correlates with cytotoxic activity. J. Clin. Microbiol. 39, 1477–1486.
Resistance of Pseudomonas aeruginosa isolates to hydrogel contact lens disinfection correlates with cytotoxic activity.Crossref | GoogleScholarGoogle Scholar | 11283074PubMed |

[27]  Garey, K.W. et al. (2008) Prevalence of type III secretion protein exoenzymes and antimicrobial susceptibility patterns from bloodstream isolates of patients with Pseudomonas aeruginosa bacteremia. J. Chemother. 20, 714–720.
Prevalence of type III secretion protein exoenzymes and antimicrobial susceptibility patterns from bloodstream isolates of patients with Pseudomonas aeruginosa bacteremia.Crossref | GoogleScholarGoogle Scholar | 19129069PubMed |

[28]  Subedi, D. et al. (2018) Association between possession of ExoU and antibiotic resistance in Pseudomonas aeruginosa. PLoS One 13, e0204936.
Association between possession of ExoU and antibiotic resistance in Pseudomonas aeruginosa.Crossref | GoogleScholarGoogle Scholar | 30265709PubMed |