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dc.contributor.authorBetts, JWen_US
dc.contributor.authorHornsey, Men_US
dc.contributor.authorWareham, DWen_US
dc.contributor.authorLa Ragione, RMen_US
dc.date.accessioned2017-08-17T15:21:42Z
dc.date.available2017-06-21en_US
dc.date.issued2017-09en_US
dc.date.submitted2017-08-09T10:09:27.370Z
dc.identifier.issn2193-8229en_US
dc.identifier.urihttp://qmro.qmul.ac.uk/xmlui/handle/123456789/25297
dc.description.abstractINTRODUCTION: Acinetobacter baumannii is an important human nosocomial pathogen; most clinical isolates are multidrug-resistant (MDR). Infections caused by A. baumannii often lead to high morbidity and mortality, with limited treatment options. Owing to the small number of anti-Gram-negative antibiotics in the development pipeline, researchers are looking to other natural compounds. The aim of this study was to determine the in vitro kill kinetics, in vivo efficacy and toxicity of theaflavin-epicatechin combinations against MDR A. baumannii. METHODS: Kill-kinetic assays were performed in Mueller-Hinton 2 broth over 24 h. Toxicity of the compound in the insect model, Galleria mellonella was investigated. The effect of theaflavin-epicatechin combinations on mortality and morbidity were assessed in Acinetobacter baumannii-infected G. mellonella. Larvae were scored for morbidity (melanisation: scale; 0-4) and mortality over 96 h. RESULTS: Kill-kinetic assays revealed that monotherapy had bacteriostatic activity over 24 h, whereas theaflavin-epicatechin combinations were bactericidal (a >3 log reduction in bacterial numbers at 24 h compared with the starting inoculum). Both polyphenols were non-toxic to G. mellonella at concentrations of up to 1000 mg/kg. In vivo treatment assays showed that the combination significantly increased (t test; p ≤ 0.05) larval survival at 96 h to 86% [±17 standard deviation percentage points (pp)] compared to monotherapy with theaflavin (52% ± 14 pp), epicatechin (44% ± 25 pp) or PBS (31% ± 13 pp). Morbidity was also lower in larvae treated with the combination, compared with monotherapy. CONCLUSION: Polyphenol combinations produce effective antibacterial action against A. baumannii and show great potential for the treatment of infections caused by MDR A. baumannii.en_US
dc.format.extent435 - 442en_US
dc.languageengen_US
dc.language.isoenen_US
dc.relation.ispartofInfect Dis Theren_US
dc.rightsCC-BY-NC
dc.subjectAcinetobacteren_US
dc.subjectGalleria mellonellaen_US
dc.subjectIn vivoen_US
dc.subjectMultidrug-resistanten_US
dc.subjectPolyphenolsen_US
dc.titleIn vitro and In vivo Activity of Theaflavin-Epicatechin Combinations versus Multidrug-Resistant Acinetobacter baumannii.en_US
dc.typeArticle
dc.rights.holder© The Author(s) 2017
dc.identifier.doi10.1007/s40121-017-0161-2en_US
pubs.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/28639145en_US
pubs.issue3en_US
pubs.notesNo embargoen_US
pubs.notesnoneen_US
pubs.organisational-group/Queen Mary University of London
pubs.organisational-group/Queen Mary University of London/Faculty of Medicine & Dentistry
pubs.organisational-group/Queen Mary University of London/Faculty of Medicine & Dentistry/Blizard Institute
pubs.organisational-group/Queen Mary University of London/Faculty of Medicine & Dentistry/Blizard Institute/Immunobiology
pubs.organisational-group/Queen Mary University of London/REF
pubs.organisational-group/Queen Mary University of London/REF/REF - SMD - Blizard
pubs.publication-statusPublisheden_US
pubs.volume6en_US


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