Abstract
Increasing incidence of multidrug-resistant bacteria presents an imminent risk to global health. Polymyxins are ‘last-resort’ antibiotics against Gram-negative ‘superbugs’; however, nephrotoxicity remains a key impediment in their clinical use. Molecular mechanisms underlying this nephrotoxicity remain poorly defined. Here, we examined the pathways which led to polymyxin B induced cell death in vitro and in vivo. Human proximal tubular cells were treated with polymyxin B (12.5–100 μM) for up to 24 h and showed a significant increase in micronuclei frequency, as well as abnormal mitotic events (over 40% in treated cells, p < 0.05). Time-course studies were performed using a mouse nephrotoxicity model (cumulative 72 mg/kg). Kidneys were collected over 48 h and investigated for histopathology and DNA damage. Notable increases in γH2AX foci (indicative of double-stranded breaks) were observed in both cell culture (up to ~ 44% cells with 5+ foci at 24 h, p < 0.05) and mice treated with polymyxin B (up to ~ 25%, p < 0.05). Consistent with these results, in vitro assays showed high binding affinity of polymyxin B to DNA. Together, our results indicate that polymyxin B nephrotoxicity is associated with DNA damage, leading to chromosome missegregation and genome instability. This novel mechanistic information may lead to new strategies to overcome the nephrotoxicity of this important last-line class of antibiotics.
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18 June 2018
In the original publication of the article, part of Fig. 6 is missing. The missing subpanels, Fig. 6c, d are given below.
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Acknowledgements
J.L. and T.V. are supported by the National Institute of Allergy and Infectious Diseases of the National Institutes of Health (R01 AI111965). Part of this work was supported by National Health and Medical Research Council (Australia) project Grant GNT1127209 (D.H.) and by the Victorian Government’s Operational Infrastructure Support Program. J.L. is an NHMRC Senior Research Fellow and T.V. is an NHMRC Career Development Industrial Fellow. This study utilised Australian Phenomics Network Histopathology and Organ Pathology Service, University of Melbourne for analysis of mouse kidneys.
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Yun, B., Zhang, T., Azad, M.A.K. et al. Polymyxin B causes DNA damage in HK-2 cells and mice. Arch Toxicol 92, 2259–2271 (2018). https://doi.org/10.1007/s00204-018-2192-1
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DOI: https://doi.org/10.1007/s00204-018-2192-1