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Region Hovedstaden - en del af Københavns Universitetshospital
Udgivet

Phenotypic shift in Pseudomonas aeruginosa populations from cystic fibrosis lungs after 2-week antipseudomonal treatment

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

DOI

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BACKGROUND: The influence of suppressive therapy on the different P. aeruginosa phenotypes harbored in the lungs of cystic fibrosis (CF) patients remains unclear. Our aim was to investigate the phenotypic changes (mucoidy, hypermutability, antibiotic resistance, transcriptomic profiles and biofilm) in P. aeruginosa populations before and after a 2-week course of suppressive antimicrobial therapy in chronically infected CF patients in Denmark.

MATERIAL AND METHODS: Prospective observational clinical study. Sputum samples were assessed before and after treatment for P. aeruginosa, with regard to: a) colony-forming units (CFU/mL), b) frequency of mucoids and non-mucoids, c) resistance pattern to anti-pseudomonal drugs, d) hypermutability, e) transcriptomic profiles, and f) presence of biofilms.

RESULTS: We collected 23 sputum samples (12 before antibiotic treatment and 11 after) and 77 P. aeruginosa from different CF patients. After treatment, the P. aeruginosa burden diminished but antimicrobial resistance to aztreonam, tobramycin and ceftazidime rose; non-mucoid phenotypes presented increased resistance to colistin, tobramycin, meropenem, and ciprofloxacin, and hypermutable phenotypes to ciprofloxacin. In spite of biofilm persistence, a down-regulation of genes involved in denitrification was detected.

CONCLUSION: A 2-week course of suppressive therapy reduces P. aeruginosa lung colonization and influences nitrogen metabolism genes, but also promotes antimicrobial resistance while P. aeruginosa persists in biofilms.

OriginalsprogEngelsk
TidsskriftJournal of cystic fibrosis : official journal of the European Cystic Fibrosis Society
Vol/bind16
Udgave nummer2
Sider (fra-til)222-229
ISSN1569-1993
DOI
StatusUdgivet - 2017

ID: 49768980