Anthelmintic closantel enhances bacterial killing of polymyxin B against multidrug-resistant Acinetobacter baumannii

Thien B. Tran, Soon Ee Cheah, Heidi H. Yu, Phillip J. Bergen, Roger L. Nation, Darren J. Creek, Anthony Purcell, Alan Forrest, Yohei Doi, Jiangning Song, Tony Velkov, Jian Li

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14 Citations (Scopus)

Abstract

Polymyxins, an old class of antibiotics, are currently used as the last resort for the treatment of multidrug-resistant (MDR) Acinetobacter baumannii. However, recent pharmacokinetic and pharmacodynamic data indicate that monotherapy can lead to the development of resistance. Novel approaches are urgently needed to preserve and improve the efficacy of this last-line class of antibiotics. This study examined the antimicrobial activity of novel combination of polymyxin B with anthelmintic closantel against A. baumannii. Closantel monotherapy (16 mg l-1) was ineffective against most tested A. baumannii isolates. However, closantel at 4-16 mg l-1 with a clinically achievable concentration of polymyxin B (2 mg l-1) successfully inhibited the development of polymyxin resistance in polymyxin-susceptible isolates, and provided synergistic killing against polymyxin-resistant isolates (MIC ≥4 mg l-1). Our findings suggest that the combination of polymyxin B with closantel could be potentially useful for the treatment of MDR, including polymyxin-resistant, A. baumannii infections. The repositioning of non-Antibiotic drugs to treat bacterial infections may significantly expedite discovery of new treatment options for bacterial 'superbugs'.

Original languageEnglish
Pages (from-to)415-421
Number of pages7
JournalJournal of Antibiotics
Volume69
Issue number6
DOIs
Publication statusPublished - 01-06-2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Drug Discovery

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    Tran, T. B., Cheah, S. E., Yu, H. H., Bergen, P. J., Nation, R. L., Creek, D. J., Purcell, A., Forrest, A., Doi, Y., Song, J., Velkov, T., & Li, J. (2016). Anthelmintic closantel enhances bacterial killing of polymyxin B against multidrug-resistant Acinetobacter baumannii. Journal of Antibiotics, 69(6), 415-421. https://doi.org/10.1038/ja.2015.127