Expression of resistance-nodulation-cell-division efflux pumps in commonly used Burkholderia pseudomallei strains and clinical isolates from northern Australia

Ayush Kumar, Mark Mayo, Lily A. Trunck, Allen C. Cheng, Bart J. Currie, Herbert P. Schweizer

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Summary: Burkholderia pseudomallei is the aetiological agent of melioidosis. Therapy for this disease is lengthy and limited to only a few antibiotics because of this bacterium's intrinsic antibiotic resistance to many clinically useful antibiotics. These properties of B. pseudomallei may partially be due to expression of efflux pumps of the resistance-nodulation-cell-division (RND) family. The patterns and magnitude of RND efflux pump expression in commonly used strains and clinical isolates of B. pseudomallei from the Royal Darwin Hospital, Darwin, Australia, were assessed in cells grown to late exponential phase using quantitative real-time PCR (qRT-PCR). Expression of the three previously identified RND efflux pumps AmrAB-OprA, BpeAB-OprB and BpeEF-OprC, as well as four other yet uncharacterized pumps, was found to be widespread in the clinical isolates. In 45 of 50 isolates (90%), mRNA was detected for at least one of the seven RND pumps. Of these 45 isolates, 41 (82%) expressed multiple pumps with nine strains expressing all seven pumps tested. While these studies revealed no striking correlation between RND efflux pump expression and clinically significant antibiotic resistance, the data support the notion that RND pumps probably play important roles in this bacterium's physiology, defence against toxic compounds, and perhaps virulence.

Original languageEnglish (US)
Pages (from-to)S145-S151
JournalTransactions of the Royal Society of Tropical Medicine and Hygiene
Volume102
Issue numberSUPPL. 1
DOIs
StatePublished - Dec 2008
Externally publishedYes

Keywords

  • Antibiotic resistance
  • Burkholderia pseudomallei
  • Efflux pumps
  • Melioidosis
  • Polymerase chain reaction
  • Resistance-nodulation-cell division

ASJC Scopus subject areas

  • Parasitology
  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

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