Neurodegenerative Disease Treatment Drug PBT2 Breaks Intrinsic Polymyxin Resistance in Gram-Positive Bacteria

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dc.contributor.authorDe Oliveira, D.M.P.
dc.contributor.authorKeller, B.
dc.contributor.authorHayes, A.J.
dc.contributor.authorOng, C.-L.Y.
dc.contributor.authorHarbison-Price, N.
dc.contributor.authorEl-Deeb, I.M.
dc.contributor.authorLi, G.
dc.contributor.authorKeller, N.
dc.contributor.authorBohlmann, L.
dc.contributor.authorBrouwer, S.
dc.contributor.authorTurner, A.G.
dc.contributor.authorCork, A.J.
dc.contributor.authorJones, T.R.
dc.contributor.authorPaterson, D.L.
dc.contributor.authorMcEwan, A.G.
dc.contributor.authorDavies, M.R.
dc.contributor.authorMcDevitt, C.A.
dc.contributor.authorItzstein, M.V.
dc.contributor.authorWalker, M.J.
dc.date.issued2022
dc.description.abstractGram-positive bacteria do not produce lipopolysaccharide as a cell wall component. As such, the polymyxin class of antibiotics, which exert bactericidal activity against Gram-negative pathogens, are ineffective against Gram-positive bacteria. The safe-for-human-use hydroxyquinoline analog ionophore PBT2 has been previously shown to break polymyxin resistance in Gram-negative bacteria, independent of the lipopolysaccharide modification pathways that confer polymyxin resistance. Here, in combination with zinc, PBT2 was shown to break intrinsic polymyxin resistance in Streptococcus pyogenes (Group A Streptococcus; GAS), Staphylococcus aureus (including methicillinresistant S. aureus), and vancomycin-resistant Enterococcus faecium. Using the globally disseminated M1T1 GAS strain 5448 as a proof of principle model, colistin in the presence of PBT2 + zinc was shown to be bactericidal in activity. Any resistance that did arise imposed a substantial fitness cost. PBT2 + zinc dysregulated GAS metal ion homeostasis, notably decreasing the cellular manganese content. Using a murine model of wound infection, PBT2 in combination with zinc and colistin proved an efficacious treatment against streptococcal skin infection. These findings provide a foundation from which to investigate the utility of PBT2 and next-generation polymyxin antibiotics for the treatment of Gram-positive bacterial infections.
dc.description.statementofresponsibilityDavid M. P. De Oliveira, Bernhard Keller, Andrew J. Hayes, Cheryl-Lynn Y. Ong, Nichaela Harbison-Price, Ibrahim M. El-Deeb, Gen Li, Nadia Keller, Lisa Bohlmann, Stephan Brouwer, Andrew G. Turner, Amanda J. Cork, Thomas R. Jones, David L. Paterson, Alastair G. McEwan, Mark R. Davies, Christopher A. McDevitt, Mark von Itzstein, and Mark J. Walker
dc.identifier.citationAntibiotics, 2022; 11(4):449-1-449-15
dc.identifier.doi10.3390/antibiotics11040449
dc.identifier.issn2079-6382
dc.identifier.issn2079-6382
dc.identifier.orcidMcDevitt, C.A. [0000-0003-1596-4841]
dc.identifier.urihttps://hdl.handle.net/2440/135123
dc.language.isoen
dc.publisherMDPI AG
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1176180
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1194130
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/2009677
dc.relation.granthttp://purl.org/au-research/grants/arc/FT170100006
dc.rights© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
dc.source.urihttps://doi.org/10.3390/antibiotics11040449
dc.subjectantimicrobial resistance
dc.subjectpolymyxins
dc.subjectPBT2
dc.subjectionophores
dc.subjectGram-positive bacteria
dc.titleNeurodegenerative Disease Treatment Drug PBT2 Breaks Intrinsic Polymyxin Resistance in Gram-Positive Bacteria
dc.typeJournal article
pubs.publication-statusPublished

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