Activity of Bedaquiline and Imipenem against Actively Growing, Nutrient-Starved, and Intracellular Mycobacterium abscessus.

Olumide Martins, Jin Lee, Amit Kaushik, Nicole C Ammerman, Kelly E Dooley, Eric L Nuermberger
Author Information
  1. Olumide Martins: Center for Tuberculosis Research, Department of Medicine, Johns Hopkins Universitygrid.21107.35grid.471401.7grid.21107.35 School of Medicine, Baltimore, Maryland, USA.
  2. Jin Lee: Center for Tuberculosis Research, Department of Medicine, Johns Hopkins Universitygrid.21107.35grid.471401.7grid.21107.35 School of Medicine, Baltimore, Maryland, USA.
  3. Amit Kaushik: Center for Tuberculosis Research, Department of Medicine, Johns Hopkins Universitygrid.21107.35grid.471401.7grid.21107.35 School of Medicine, Baltimore, Maryland, USA. ORCID
  4. Nicole C Ammerman: Center for Tuberculosis Research, Department of Medicine, Johns Hopkins Universitygrid.21107.35grid.471401.7grid.21107.35 School of Medicine, Baltimore, Maryland, USA. ORCID
  5. Kelly E Dooley: Center for Tuberculosis Research, Department of Medicine, Johns Hopkins Universitygrid.21107.35grid.471401.7grid.21107.35 School of Medicine, Baltimore, Maryland, USA. ORCID
  6. Eric L Nuermberger: Center for Tuberculosis Research, Department of Medicine, Johns Hopkins Universitygrid.21107.35grid.471401.7grid.21107.35 School of Medicine, Baltimore, Maryland, USA. ORCID

Abstract

Mycobacterium abscessus lung disease is difficult to treat due to intrinsic drug resistance and the persistence of drug-tolerant bacteria. Currently, the standard of care is a multidrug regimen with at least 3 active drugs, preferably including a β-lactam (imipenem or cefoxitin). These regimens are lengthy and toxic and have limited efficacy. The search for more efficacious regimens led us to evaluate Bedaquiline, a diarylquinoline licensed for treatment of multidrug-resistant tuberculosis. We performed time-kill experiments to evaluate the activity of Bedaquiline alone and in combination with the first-line drug imipenem against M. abscessus under various conditions. Against actively growing bacteria, Bedaquiline was largely bacteriostatic and antagonized the bactericidal activity of imipenem. Contrarily, against nutrient-starved persisters, Bedaquiline was bactericidal, while imipenem was not, and Bedaquiline drove the activity of the combination. In an intracellular infection model, Bedaquiline and imipenem had additive bactericidal effects. Correlations between ATP levels and the bactericidal activity of imipenem and its antagonism by Bedaquiline were observed. Interestingly, the presence of Tween 80 in the media affected the activity of both drugs, enhancing the activity of imipenem and reducing that of Bedaquiline. Overall, these results show that Bedaquiline and imipenem interact differently depending on culture conditions. Previously reported antagonistic effects of Bedaquiline on imipenem were limited to conditions with actively multiplying bacteria and/or the presence of Tween 80, whereas the combination was additive or indifferent against nutrient-starved and intracellular M. abscessus, where promising bactericidal activity of the combination suggests it may have a role in future treatment regimens.

Keywords

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Grants

  1. K24 AI150349/NIAID NIH HHS
  2. Research Fellowship Award/Roche Holding | Genentech (Genentech Inc)
  3. /Cystic Fibrosis Foundation (CFF)
  4. R21 AI137814/NIAID NIH HHS
  5. K24-AI150349/HHS | National Institutes of Health (NIH)
  6. R21-AI137814/HHS | National Institutes of Health (NIH)

MeSH Term

Anti-Bacterial Agents
Diarylquinolines
Humans
Imipenem
Microbial Sensitivity Tests
Mycobacterium Infections, Nontuberculous
Mycobacterium abscessus
Nutrients

Chemicals

Anti-Bacterial Agents
Diarylquinolines
Imipenem
bedaquiline

Word Cloud

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