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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Biofilms of Candida albicans and Streptococcus sanguinis and their susceptibility to antimicrobial effects of photodynamic inactivation

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do Rosario Palma, Ana Luiza [1] ; de Paula-Ramos, Lucas [1] ; Domingues, Nadia [1] ; Back-Brito, Graziella Nuernberg [1] ; de Oliveira, Luciane Dias [1] ; Pereira, Cristiane Aparecida [1] ; Cardoso Jorge, Antonio Olavo [1]
Total Authors: 7
[1] Sao Paulo State Univ Unesp, Dept Biosci & Oral Diag, Inst Sci & Technol, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Photodiagnosis and Photodynamic Therapy; v. 24, p. 95-101, DEC 2018.
Web of Science Citations: 1

This study evaluated the effects of photodynamic inactivation (PDI) on single and multi-species biofilms, compounds by Candida albicans and Streptococcus sanguinis. Biofilms were formed, on microplate of 96 wells, by suspensions of C. albicans (ATCC 18804) and S. sanguinis (ATCC 7073) adjusted in 10(7) cells/mL, followed by incubation of 48 h (with 5% CO2). The effects of the photosensitizer erythrosine (ER) at 400 mu M for 5 min and green light-emitting diode (LED - 532 +/- 10 nm) for 3 min, alone and conjugated, were evaluated. After normality test, results was analysed by Tukey's test (P < 0.05). PDI group promoted reductions of 1.07 and 0.39 log(10), respectively, in biofilms of C. albicans alone and in association with S. sanguinis. Biofilms of S. sanguinis alone were more sensitive, with reduction of 4.48 log(10). When in association with the yeast, S. sanguinis have a decrease of 2.67 log(10). SEM analysis revealed a decrease in bacterial and fungal structures of biofilms treated with PDI. In conclusion PDI promoted significant microbial reductions in both species of microorganisms grown on mixed biofilms. This study is one of the pioneers to evaluate the antimicrobial action of PDI on biofilms of S. sanguinis and C. albicans, demonstrating a way to control these microorganisms of clinical importance. (AU)

FAPESP's process: 13/07411-6 - Polymicrobial biofilms: study, characterization, evaluation of pathogenicity in Galleria mellonella, and influence in the expression of C. albicans virulence genes.
Grantee:Cristiane Aparecida Pereira
Support type: Scholarships in Brazil - Post-Doctorate