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Photodynamic antimicrobial chemotherapy (PACT) with methylene blue increases membrane permeability in Candida albicans

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Abstract

Photodynamic antimicrobial chemotherapy (PACT) is a potential antimicrobial therapy that combines light and a photosensitizing drug, promoting a phototoxic effect on the treated cells, in general via oxidative damage. In this work we studied the effect of PACT, using methylene blue (MB), on the permeability of Candida albicans membrane. Our results demonstrated that the combination of MB and laser (684 nm) promoted a decrease in Candida growth. The inhibition was more pronounced in the presence of 0.05 mg/ml MB and with an energy density of 28 J/cm2. The decrease in Candida growth was associated with an increase in membrane permeabilization. Thus, we suggest that a PACT mechanism using MB can be related to damage in the plasma membranes of the cells.

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Acknowledgments

The authors acknowledge the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), for the grants numbered 2004/10539-5 and 2001/12754-2, under which this research was conducted.

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Authors and Affiliations

  1. Instituto de Pesquisa e Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, 12244-000, São José dos Campos, SP, Brazil

    Ligia Maria Giroldo, Monalisa Poliana Felipe, Marco Antonio de Oliveira, Egberto Munin, Leandro Procópio Alves & Maricilia Silva Costa

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  1. Ligia Maria Giroldo
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  2. Monalisa Poliana Felipe
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  3. Marco Antonio de Oliveira
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  4. Egberto Munin
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  5. Leandro Procópio Alves
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  6. Maricilia Silva Costa
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Correspondence to Maricilia Silva Costa.

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Giroldo, L.M., Felipe, M.P., de Oliveira, M.A. et al. Photodynamic antimicrobial chemotherapy (PACT) with methylene blue increases membrane permeability in Candida albicans . Lasers Med Sci 24, 109–112 (2009). https://doi.org/10.1007/s10103-007-0530-2

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  • DOI: https://doi.org/10.1007/s10103-007-0530-2

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