Abstract
Introduction
Infections associated with medical devices are often related to colonization by Candida spp. biofilm; in this way, numerous strategies have been developed and studied, mainly in order to prevent this type of fungal growth.
Aim
Considering the above, the main objective of the present study is to make a rational choice of the best antifungal therapy for the in vitro treatment of the biofilm on venous catheters, proposing an innovative formulation of a film-forming system to coat the surface in order to prevent the formation of biofilms.
Methodology
Anidulafungin, fluconazole, voriconazole, ketoconazole, amphotericin B, and the association of anidulafungin and amphotericin B were tested against biofilms of C. albicans, C. tropicalis, and C. parapsilosis strains in microtiter plates and in a polyurethane catheter. Besides, anidulafungin, amphotericin B, and the combination of both were incorporated in a film-forming system and were evaluated against biofilm.
Results
The superior activity of anidulafungin was demonstrated in relation to the other antifungal agents. Although amphotericin B showed good activity, high concentrations were required. The combination showed a synergistic action, in solution and in the formulation, showing excellent results, with activity above 90%.
Conclusion
Due to the superiority of anidulafungin and the synergistic activity of the combination, these alternatives were the most promising options for use in a formulation proposal as a new strategy to combat the Candida spp. biofilm. These formulations demonstrated high in vitro performance in the prevention of biofilms, indicating that they are candidates with great potential for in vivo tests.
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Acknowledgments
The authors thank the Núcleo de Apoio Estatístico and Centro de Microscopia e Microanálise, Campus do Vale, Universidade Federal do Rio Grande do Sul, Porto Alegre/RS, Prof. Dr. Patrícia Valente da Silva, and to Dr. Bruna Pippi. A. M. Fuentefria is grateful to CNPq for their research fellowships.
Funding
This work was supported by the Brazilian agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Fundação de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS–EDITAL 04/2016 –PRONUPEQ 2016).
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Reginatto, P., Bergamo, V.Z., Berlitz, S.J. et al. Rational selection of antifungal drugs to propose a new formulation strategy to control Candida biofilm formation on venous catheters. Braz J Microbiol 51, 1037–1049 (2020). https://doi.org/10.1007/s42770-020-00242-z
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DOI: https://doi.org/10.1007/s42770-020-00242-z