Molecular analysis and antimicrobial resistance pattern of distinct strains of Pseudomonas aeruginosa isolated from cystic fibrosis patients in Iran

  • Mohammad Emaneini
  • Davood Kalantar-Neyestanaki
  • Leila Jabalameli
  • Mojtaba Hashemi
  • Reza Beigverdi
  • Fereshteh Jabalameli

Abstract

Background and Objectives: Colonization of Pseudomonas aeruginosa in Cystic Fibrosis (CF) patients may lead to severe pulmonary disease and death. Different characteristics of P. aeruginosa from these patients were determined in the present study.

Materials and Methods: Antimicrobial susceptibility and AmpC-overproduction were determined. The β-lactamase genes were detected by PCR and the oprD gene was sequenced in some of the carbapenem resistance isolates. Distribution of exo genes was determined by PCR. Cytotoxicity of Exo effector proteins was measured using A549 cells. Biofilm production was determined by microtiter plate assay. Random amplified polymorphic DNA (RAPD) –PCR was performed for molecular analysis.

Results: Polymyxin B, piperacillin/tazobactam and meropenem were the most active antibiotics and 9.6% of isolates were

 

ampC overproducers. The prevalence of bla

 

, bla

 

, bla

 

, and bla

 

genes were as follow: 22.7%, 3.75%, 6.25% and

 

VEB

 

OXA

 

VIM

 

PER

 

3.75%, respectively. A high proportion (83.5%) of isolates was able to produce biofilm. The exoT gene was present in all isolates while exoU was present in about 35% of them. RAPD-PCR revealed 49 patterns among 78 tested isolates in which

34 patterns were detected once.

Conclusion: Biofilm formation ability and relatively high frequency of exoS may contribute to the persistence of bacteria within lungs of CF patients. Some characteristics of isolates recovered from a single patient after several sampling proce- dures were similar, while others lacked resemblance.

Published
2019-06-12
Section
Articles