Volume 14, Issue 10 e202100150
RESEARCH ARTICLE

In vitro evaluation of photodynamic activity of methylene blue against Trichophyton verrucosum azole-susceptible and -resistant strains

Sebastian Gnat

Corresponding Author

Sebastian Gnat

Faculty of Veterinary Medicine, Department of Veterinary Microbiology, University of Life Sciences, Lublin, Poland

Correspondence

Sebastian Gnat, Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Life Sciences, Lublin, Poland.

Email: [email protected]

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Dominik Łagowski

Dominik Łagowski

Faculty of Veterinary Medicine, Department of Veterinary Microbiology, University of Life Sciences, Lublin, Poland

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Mariusz Dyląg

Mariusz Dyląg

Faculty of Biological Sciences, Department of Mycology and Genetics, University of Wroclaw, Wroclaw, Poland

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Jessica Zielinski

Jessica Zielinski

Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina, USA

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Aneta Nowakiewicz

Aneta Nowakiewicz

Faculty of Veterinary Medicine, Department of Veterinary Microbiology, University of Life Sciences, Lublin, Poland

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First published: 29 June 2021
Citations: 2

Abstract

The intense search for the “Holy Grail” of antifungal therapy can be observed today. The searches are not limited only to discovery of potential antifungal drugs, but also new therapeutic strategies involving the use of chemosensitizers to achieve synergistic effect or physicochemical factors inducing stress conditions in fungal cells. In this study was examined in vitro effectiveness of photodynamic antifungal strategy with methylene blue using a light beam with a wavelength equal to 635 nm toward the Trichophyton verrucosum susceptible and itraconazole- and/or fluconazole-resistant strains. Methylene blue used at concentration equal to 5 μg/mL and in the presence of 40 J/cm2 of light energy showed fungicidal effect toward the susceptible strains. However, for azole-resistant isolates, only the energy dose equal to 60 J/cm2 at 5 μg/mL of methylene blue allowed to kill the pathogen. This study confirms that methylene blue induced by red light has a definite inhibitory effect on zoophilic dermatophytes.image

CONFLICT OF INTEREST

The authors declare no potential conflict of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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