Distinct contribution of hyperbaric oxygen therapy to human neutrophil function and antibiotic efficacy against Staphylococcus aureus

Franziska A. Schwartz*, Christian J. Lerche, Lars Christophersen, Peter Østrup Jensen, Anne Sofie Laulund, Anders Woetmann, Niels Høiby, Claus Moser

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

3 Citations (Scopus)

Abstract

Staphylococcus aureus (SA) causes superficial and severe endovascular infections. The present in vitro study investigates the anti-SA mechanisms of hyperbaric oxygen therapy (HBOT) on direct bacterial killing, antibiotic potentiation, and polymorphonuclear leukocyte (PMN) enhancement. SA was exposed to isolated human PMNs, tobramycin, ciprofloxacin, or benzylpenicillin. HBOT was used as one 90-min session. Bacterial survival was evaluated after 4 h by quantitative bacteriology. PMN functionality as reactive oxygen species (ROS) production was measured by means of dihydrorhodamine 123 analysis. We showed that HBOT exhibits significant direct anti-SA effects. HBOT increased the anti-SA effects of PMNs by 18% after PMA stimulation (p = 0.0004) and by 15% in response to SA (p = 0.36). HBOT showed an additive effect as growth reductions of 26% to sub-MICs of tobramycin (p = 0.0057), 44% to sub-MICs of ciprofloxacin (p = 0.0001), and 26% to sub-MICs of penicillin (p = 0.038). The present in vitro study provides evidence that HBOT has differential mechanisms mediating its anti-SA effects. Our observation supports the clinical possibility for adjunctive HBOT to augment the host immune response and optimize the efficacy of antibiotic treatments.

Original languageEnglish
JournalActa Pathologica Microbiologica et Immunologica Scandinavica
Volume129
Issue number9
Pages (from-to)566-573
ISSN0903-4641
DOIs
Publication statusPublished - 2021

Bibliographical note

Publisher Copyright:
© 2021 Scandinavian Societies for Medical Microbiology and Pathology.

Keywords

  • host response
  • hyperbaric oxygen therapy
  • Infection
  • neutrophils
  • oxidative stress

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