Optimization of Antimicrobial Photodynamic Therapy in Biofilms by Inhibiting Efflux Pump

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dc.contributor.authorDe Aguiar Coletti, Tatiana Maria Starck Fogaça [UNESP]
dc.contributor.authorDe Freitas, Laura Marise [UNESP]
dc.contributor.authorAlmeida, Ana Marisa Fusco [UNESP]
dc.contributor.authorFontana, Carla Raquel [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:13:11Z
dc.date.available2018-12-11T17:13:11Z
dc.date.issued2017-07-01
dc.description.abstractBackground: One of the main mechanisms of microbial resistance is given by efflux pumps, which reduce the effectiveness of antimicrobials by decreasing their intracellular concentration. Objective and methods: Considering that efflux pump inhibitors are promising adjuvant molecules for antibiotics in infections, in this study, using XTT test and colony forming unit (CFU) counting, we evaluated the association between the pump inhibitor verapamil (VP) and the antimicrobial photodynamic therapy (aPDT) mediated by methylene blue (MB) in biofilms of Escherichia coli and Staphylococcus aureus to optimize the bacterial reduction. Results: By applying 44 J/cm2, 215 μg/mL of VP, and 200 μg/mL of MB, we obtained 80% of metabolism reduction and 3.4 log10 CFU/mL decrease for E. coli. Biofilm of S. aureus presented 80% of metabolism reduction and 3.65 log10 CFU/mL decrease when 22 J/cm2, 312 μg/mL of VP, and 200 μg/mL of MB was used. Applying 200 μg/mL of MB, the E. coli biofilm required a higher dose of light, while the S. aureus biofilm required a higher concentration of VP to obtain the same reduction. Conclusions: The VP optimized the efficiency of aPDT and showed no toxicity when used alone in both strains, proving that inhibiting efflux pumps in combination with aPDT has great potential for clinical application.en
dc.description.affiliationUniversidade Estadual Paulista (UNESP) Faculdade de Ciências Farmacêuticas Campus Araraquara Departamento de Análises Clínicas, Rodovia Araraquara-Jau s/n
dc.description.affiliationUnespUniversidade Estadual Paulista (UNESP) Faculdade de Ciências Farmacêuticas Campus Araraquara Departamento de Análises Clínicas, Rodovia Araraquara-Jau s/n
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent378-385
dc.identifierhttp://dx.doi.org/10.1089/pho.2016.4246
dc.identifier.citationPhotomedicine and Laser Surgery, v. 35, n. 7, p. 378-385, 2017.
dc.identifier.doi10.1089/pho.2016.4246
dc.identifier.issn1549-5418
dc.identifier.scopus2-s2.0-85022023456
dc.identifier.urihttp://hdl.handle.net/11449/174860
dc.language.isoeng
dc.relation.ispartofPhotomedicine and Laser Surgery
dc.relation.ispartofsjr0,443
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectantimicrobial photodynamic therapy
dc.subjectbiofilms
dc.subjectefflux pump
dc.subjectmethylene blue
dc.titleOptimization of Antimicrobial Photodynamic Therapy in Biofilms by Inhibiting Efflux Pumpen
dc.typeArtigo
unesp.author.lattes3716273524139678[3]
unesp.author.lattes5168319315634298[4]
unesp.author.orcid0000-0002-2115-8988[3]
unesp.author.orcid0000-0002-9135-3690[4]

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