Rapid antimicrobial susceptibility test for identification of new therapeutics and drug combinations against multidrug-resistant bacteria.

Therapeutic Approaches

Abstract

Current antimicrobial susceptibility testing has limited screening capability for identifying empirical antibiotic combinations to treat severe bacterial infections with multidrug-resistant (MDR) organisms. We developed a new antimicrobial susceptibility assay using automated ultra-high-throughput screen technology in combination with a simple bacterial growth assay. A rapid screening of 5170 approved drugs and other compounds identified 25 compounds with activities against MDR Klebsiella pneumoniae. To further improve the efficacy and reduce the effective drug concentrations, we applied a targeted drug combination approach that integrates drugs' clinical antimicrobial susceptibility breakpoints, achievable plasma concentrations, clinical toxicities and mechanisms of action to identify optimal drug combinations. Three sets of three-drug combinations were identified with broad-spectrum activities against 10 MDR clinical isolates including K. pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, Citrobacter freundii, Enterobacter cloacae and Escherichia coli. Colistin-auranofin-ceftazidime and colistin-auranofin-rifabutin suppressed >80% growth of all 10 MDR strains; while rifabutin-colistin-imipenem inhibited >75% of these strains except two Acinetobacter baumannii isolates. The results demonstrate this new assay has potential as a real-time method to identify new drugs and effective drug combinations to combat severe clinical infections with MDR organisms.

Authors

Sun, Wei; Weingarten, Rebecca A; Xu, Miao; Southall, Noel; Dai, Sheng; Shinn, Paul; Sanderson, Philip; Williamson, Peter R; Frank, Karen M; Zheng, Wei;

Keywords

  • Acinetobacter Infections/ microbiology
  • Acinetobacter baumannii/ drug effects
  • Acinetobacter baumannii/ growth & development
  • Acinetobacter baumannii/ isolation & purification
  • Anti-Bacterial Agents/ pharmacology
  • Antirheumatic Agents/ pharmacology
  • Auranofin/ pharmacology
  • Bacterial Infections/ microbiology
  • Colistin/ pharmacology
  • Drug Combinations
  • Drug Discovery/ methods
  • Drug Resistance, Multiple, Bacterial
  • Drug Synergism
  • Humans
  • Klebsiella pneumoniae/ drug effects
  • Klebsiella pneumoniae/ growth & development
  • Klebsiella pneumoniae/ isolation & purification
  • Microbial Sensitivity Tests
  • Pseudomonas aeruginosa/ drug effects
  • Pseudomonas aeruginosa/ growth & development
  • Pseudomonas aeruginosa/ isolation & purification

External Links