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Reactive oxygen species induce antibiotic tolerance during systemic Staphylococcus aureus infection

An Author Correction to this article was published on 10 February 2020

This article has been updated

Abstract

Staphylococcus aureus is a major human pathogen that causes an array of infections ranging from minor skin infections to more serious infections, including osteomyelitis, endocarditis, necrotizing pneumonia and sepsis1. These more serious infections usually arise from an initial bloodstream infection and are frequently recalcitrant to antibiotic treatment1. Phagocytosis by macrophages and neutrophils is the primary mechanism through which S. aureus infection is controlled by the immune system2. Macrophages have been shown to be a major reservoir of S. aureus in vivo3, but the role of macrophages in the induction of antibiotic tolerance has not been explored. Here, we show that macrophages not only fail to efficiently kill phagocytosed S. aureus, but also induce tolerance to multiple antibiotics. Reactive oxygen species generated by respiratory burst attack iron–sulfur cluster-containing proteins, including TCA-cycle enzymes, result in decreased respiration, lower ATP and increased antibiotic tolerance. We further show that respiratory burst induces antibiotic tolerance in the spleen during a murine systemic infection. These results suggest that a major component of the innate immune response is antagonistic to the bactericidal activities of antibiotics.

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Fig. 1: Induction of antibiotic tolerance by stimulated macrophages.
Fig. 2: ROS decreases the metabolic activity of S. aureus.
Fig. 3: Macrophage-derived ROS induce antibiotic tolerance in S. aureus.
Fig. 4: Host-derived ROS induce antibiotic tolerance in a mouse model of sepsis.

Data availability

Additional data that support the findings of this study are available from the corresponding author upon request.

Change history

  • 10 February 2020

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Acknowledgements

This work was supported primarily by NIH grant nos R01AI137273 and K22AI125501 to B.P.C. The Microscopy Services Laboratory is supported in part by the P30 CA016086 Cancer Center Core Support Grant to the UNC Lineberger Comprehensive Cancer Center. The oxygraph experiments were supported by grant no. R01CA211732 to Q.Z. The animal experiments were supported by grant nos R01AI137273 and K22AI125501 to B.P.C, and grant nos AI133236, AI139304, AI119073, AI136920 and the Yang Biomedical Scholars Award to E.A.M. The UNC Lineberger Animal Studies Core Facility, which is supported in part by an NCI Center Core support grant (grant no. CA16086) to the UNC Lineberger Comprehensive Cancer Center, assisted with the animal experiments. We are grateful to the Gastrointestinal Biology and Disease (CGIBD) Imaging and Histology Core, supported by NIH grant no. P30-DK 034987 awarded to the CGIBD Imaging and Histology Core, for processing the histology samples. We thank G. Jones and J. Arthur for their technical advice and equipment.

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B.P.C., S.E.R., N.J.W. and E.A.M. conceptualized the project. B.P.C. and S.E.R. wrote the manuscript. S.E.R., N.J.W., L.C.R., A.D.W., J.E.B. and L.L. performed the in vitro experiments. N.J.W. and J.E.B. performed the tissue culture experiments. S.E.R., N.J.W., L.C.R., J.E.B. and L.L. performed the animal experiments. Q.Z. provided equipment. S.E.R., N.J.W. and J.E.B. produced the figures. B.P.C. and E.A.M. provided funding for the project.

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Correspondence to Brian P. Conlon.

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Extended data

Extended Data Fig. 1 Induction of antibiotic tolerance by ROS.

(a) S. aureus strain COL or (be) HG003 was grown to mid-exponential phase in vitro and exposed to 80 μM menadione (MD), 0.125μg/ml mupirocin, acidified media (pH4.5), 5mM paraquat (PQ), 120 mM hydrogen peroxide (H2O2), 4mM N-acetyl cysteine (NAC) or 150mM thiourea (TU) for 20 min and either (a, c, d) challenged with 10µg/ml rifampicin or (b) plated for cfu or (e) OD600 was recorded every 30min for 10h. (ad) At indicated times, an aliquot was removed and plated on tryptic soy agar (TSA) to enumerate cfu. Averages of n=3 biologically independent samples. Error bars represent standard deviation. Statistical significance was determined using (a, c) Student’s t-test (unpaired, two- tailed) or (d) One-Way ANOVA with Dunnett’s multiple comparison test. Source data

Extended Data Fig. 2 ROS induces multidrug tolerance in S. aureus.

HG003 was grown to exponential phase in vitro and exposed to 80μM menadione (MD) for 20min prior to challenge with (a) 2.34μg/ml ciprofloxacin (cip), (b) 50μg/ml oxacillin (ox) or (c) 50μg/ml vancomycin (vanc). (d) Survival of S. aureus cells after internalization by unstimulated J774 macrophages (unstim.) or macrophages that were stimulated overnight with LPS/IFNγ (stim.). 40μg/ml cip was added at Time 0 (dotted lines). At the indicated times, an aliquot was removed, washed and plated to enumerate survivors. (e) % Survival of S. aureus cells treated with ciprofloxacin for 4h compared to the untreated control (data extrapolated from d). Averages of n=3 biologically independent samples. Error bars represent standard deviation. Statistical significance was determined using (a-c, e) the Student’s t-test (unpaired, two-tailed) or (d) One-Way ANOVA with Sidak’s multiple comparison test. Source data

Extended Data Fig. 3 Growth cessation is insufficient to induce tolerance to rifampicin.

S. aureus strain HG003 was grown to mid-exponential phase in vitro and exposed to 80μM menadione (MD), 5mM paraquat (PQ), 120mM hydrogen peroxide (H2O2) or 30µg/ml chloramphenicol (Cam) for 20min and either (a) plated for cfu or (b) challenged with 10µg/ml rifampicin. At indicated times, an aliquot was removed and plated on tryptic soy agar (TSA) to enumerate cfu. Averages of n=3 biologically independent samples. Error bars represent standard deviation. Source data

Extended Data Fig. 4 ROS decreases the metabolic activity of S. aureus.

HG003 was grown to mid-exponential phase and treated with 80μM menadione (MD), 5mM paraquat (PQ), 120mM hydrogen peroxide (H2O2), 4mM N-acetyl cysteine (NAC) or 5.5mM glucose (gluc) for (af, j) 2h or (g, h) 0.5h and then assayed for (a, e) succinate dehydrogenase (SDH) activity, (b, f) isocitrate dehydrogenase (IDH) activity and (d, g, j) aconitase activity. (c) Transcriptional activity of acn, sdh and icd genes was determined using promoter-gfp reporters. (h) ATP was quantified using a BactiterGlo Cell Viability Assay. (i) At indicated times, ROS production was measured using L-012 luminescent probe and expressed as a fold-increase compared to the untreated control. RLU denotes relative luminescence units. Averages of n=3 biologically independent samples. Error bars represent standard deviation. Statistical significance was determined using (ac) Student’s t-test (unpaired, two-tailed) or (d, e, j) One-Way ANOVA with Dunnett’s multiple comparison test, (fh) One-Way ANOVA with Sidak’s multiple comparison test or (i) Two-Way ANOVA with Sidak’s multiple comparison test. Source data

Extended Data Fig. 5 Macrophage-derived ROS induce antibiotic tolerance in S. aureus.

(a, b) Survival of S. aureus strain HG003 after internalization by THP-1 macrophages. Where indicated, macrophages were pretreated with 20 μM BHA for 1 h prior to the addition of bacteria. (a) 10μg/ml rifampicin (rif) was added at Time 0 (dotted lines). (b) % rifampicin tolerant cells was determined by comparing survivors after 6h of rifampicin treatment to survivors of the corresponding untreated time point (extrapolated from a). (c) ROS production by THP-1 macrophages with or without BHA treatment was quantified using the luminescent probe L-012. RLU denotes relative luminescence units. (d, e) Survival of S. aureus strain HG003 (WT), HG003acnA::erm (acnA) and HG003sdhB::erm (sdhB) mutants after internalization by (d) unstimulated J774 macrophages or macrophages that were (e) pre-stimulated overnight with LPS/IFNγ. 10μg/ml rifampicin (rif) was added at Time 0 (dotted lines). Averages of n=3 biologically independent samples. Error bars represent standard deviation. Statistical significance was determined using (a, d, e) One-Way ANOVA with Sidak’s multiple comparison test or (b-c) Student’s t-test (unpaired, two-tailed). Source data

Extended Data Fig. 6 Host-derived ROS induces antibiotic tolerance in a mouse model of sepsis.

Sepsis was induced by intravenous injection of S. aureus strain HG003 into (a, b) C57BL/6J wild type (WT) and Ncf1−/− mutant mice or (c, d) wild type mice treated with or without 25mM tempol. At 24h.p.i., mice were treated daily with 25mg/kg rifampicin or the vehicle control. S. aureus cfu were enumerated from the kidney and liver at 48h.p.i. or 72h.p.i. The mean is indicated by a horizontal line and the limit of detection is indicated by the x-axis (ad). (a, b) Wild type mice: vehicle/rifampicin n=9 animals, Ncf1-/- mice: vehicle n=10 / rifampicin n=11 animals. (c, d) control n=4 / tempol n=5 animals (at 24h p.i,) and control/tempol mice: vehicle/rifampicin n=10 animals (at 48h and 72h.p.i.). (e-f) Extracellular bacterial numbers were enumerated in the spleen and liver of control (n=3 animals) and tempol treated (n=4 animals) mice at 24h.p.i. prior to antibiotic challenge and error bars represent standard deviation. Statistical significance was determined using (ad) Kruskal Wallis One-Way ANOVA with Dunn’s multiple comparison test or the (e, f) Mann- Whitney test. Source data

Extended Data Fig. 7 Resistance does not contribute to menadione-induced antibiotic tolerance.

HG003 was grown to mid-exponential phase in vitro and exposed to 80μM menadione (MD) for 20min prior to addition of 10µg/ml rifampicin. At indicated times, an aliquot was removed and plated on tryptic soy agar (TSA) to enumerate survivors or TSA containing 10µg/ml rifampicin to enumerate rifampicin-resistant mutants (rifR). Averages of n=3 biologically independent samples. Error bars represent standard deviation. Statistical significance was determined using Student’s t-test (unpaired, two-tailed). Source data

Extended Data Fig. 8 ROS does not inactivate rifampicin.

At indicated times the minimum inhibitory concentration (MIC) of rifampicin (rif) was determined following exposure to ROS in the in vitro antibiotic survival assays (Fig. 1c) and in tissue culture intracellular survival assays (Fig. 1a).

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Rowe, S.E., Wagner, N.J., Li, L. et al. Reactive oxygen species induce antibiotic tolerance during systemic Staphylococcus aureus infection. Nat Microbiol 5, 282–290 (2020). https://doi.org/10.1038/s41564-019-0627-y

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