Inhibition of quorum-sensing-dependent virulence factors and biofilm formation of clinical and environmental Pseudomonas aeruginosa strains by ZnO nanoparticles.

Abstract

UNLABELLED:

Quorum quenching decreases Pseudomonas aeruginosa virulence factors and biofilm formation, alleviating infections in animal models. Nevertheless, it is usually performed in laboratory strains such as PAO1 and PA14, and studies involving clinical or environmental isolates are scarce. In this work, the effects of ZnO nanoparticles, a potent quorum and virulence quencher for the PAO1 strain, were tested in six clinical strains from cystic fibrosis patients, a furanone C-30 resistant clinical strain from urine, two PA14 gallium resistant mutants, a PA14 C-30 resistant mutant and four environmental isolates. ZnO nanoparticles effectively decreased elastase, pyocyanin, and biofilm formation for most of the strains; regardless their origin or their resistance against the canonical quorum quencher C-30 or the novel antimicrobial gallium. The data indicate ZnO nanoparticles may have a broad spectrum for the quorum quenching of relevant strains and that may be an alternative to treat Ps. aeruginosa recalcitrant infections.

SIGNIFICANCE AND IMPACT OF THE STUDY:

Virulence inhibition by quorum quenchers in Pseudomonas aeruginosa is usually tested in laboratory strains and studies of their effects in relevant clinical and environmental strains are scarce. This study is significant as the effects of ZnO nanoparticles in QS-dependent virulence factor production were tested in six clinical strains from cystic fibrosis patients, a C-30 resistant clinical strain from urine, two PA14 gallium resistant mutants, a PA14 C-30 resistant mutant, and four environmental isolates. ZnO nanoparticles decreased elastase, pyocyanin, and biofilms for most of the strains; indicating they have broad spectrum and may be an alternative to treat Ps. aeruginosa infections.

• Authors: B García-Lara, M Á Saucedo-Mora, J A Roldán-Sánchez, B Pérez-Eretza, M Ramasamy, J Lee, R Coria-Jimenez, M Tapia, V Varela-Guerrero, R García-Contreras
• Journal: Letters in applied microbiology (Lett Appl Microbiol) Vol. 61 Issue 3 Pg. 299-305 (Sep 2015) ISSN: 1472-765X [Electronic] England
• PMID: 26084709 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2015 The Society for Applied Microbiology.

Chemical References

• Anti-Bacterial Agents
• Furans
• Virulence Factors
• furanone C-30
• Pyocyanine
• Gallium
• Pancreatic Elastase
• Zinc Oxide

Topics

• Animals
• Anti-Bacterial Agents (pharmacology)
• Biofilms (drug effects, growth & development)
• Cystic Fibrosis (microbiology)
• Drug Resistance, Bacterial (genetics)
• Furans
• Gallium (pharmacology)
• Humans
• Metal Nanoparticles
• Pancreatic Elastase (metabolism)
• Pseudomonas Infections (drug therapy)
• Pseudomonas aeruginosa (drug effects, pathogenicity)
• Pyocyanine (metabolism)
• Quorum Sensing (drug effects)
• Virulence
• Virulence Factors (biosynthesis)
• Zinc Oxide (pharmacology)