Cited by 19Antifungal resistance and susceptibilityPhotodynamic Therapy Research StudiesBacterial biofilms and quorum sensing

Effect of antimicrobial photodynamic therapy using toluidine blue on dual-species biofilms of Candida albicans and Candida krusei

Rodrigues, Ana Beatriz Furtado, Passos, Juliene Cristina da Silva, Costa, Maricilia Silva·2023·Photodiagnosis and Photodynamic Therapy

Abstract

Background Although Candida albicans is the most frequent etiological agent of candidiasis, it has been reported a sizable number of infections related to the non-albicans Candida (NAC) species, Candida krusei. In addition, dual biofilms (biofilms composed by two species) may easily occur in vivo, becoming even more challenging the treatment of an infection. The fungicide effect of Photodynamic Therapy (PDT), using toluidine blue O (TBO) on both C. albicans and C. krusei development has been demonstrated. Thus, the objective of this study was to investigate the effects of PDT on dual-species biofilms of Candida albicans and Candida krusei.Methods The effect of PDT was observed on the metabolic activity of mature dual-species biofilms of Candida albicans and Candida krusei by a metabolic assay based on the reduction of XTT (2,3-bis(2‑methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide sodium salt) assay and the identification of Candida albicans and Candida krusei was performed on CHROMagar Candida medium.Results it was observed a reduction of ∼30% in the metabolic activity of a mature biofilm treated with PDT, using 0.05 mg·mL-1 TBO and during biofilm formation a predominance of C. albicans on C. krusei was observed. The inhibition observed was related to reduction in the number of Colony Forming Units (CFU) of Candida albicans from 31.33 ± 3.7 to 17.0 ± 1.5. The number of CFU of C. krusei was not significantly modified.Conclusions These results demonstrated the efficiency of PDT in inhibiting the dual-species biofilms of Candida albicans and Candida krusei by reducing C. albicans development.

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Crossref · 10.1016/j.pdpdt.2023.103600

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Authors
Rodrigues, A. B. F., Passos, J. C. D. S., & Costa, M. S.
Affiliations
Universidade do Vale do Paraíba (BR)
Venue
Photodiagnosis and Photodynamic Therapy
Publisher
Elsevier BV
Published
2023-06
Volume
42
Pages
103600
ISSN
1572-1000 (ISSN-L)
OpenAlex
W4372313618
Cited by
19
References
58
Citations by year
2026: 3 · 2025: 8 · 2024: 5 · 2023: 3
FWCI
3.91
Type
journal article
Language
en
Open access
closed
Locations
  • Photodiagnosis and Photodynamic Therapy (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fundação de Amparo à Pesquisa do Estado de São Paulo
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Photodynamic Therapy Research Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
Keywords
antimicrobial photodynamic therapy, toluidine blue, dual-species biofilms, Candida albicans, Candida krusei, non-albicans Candida, candidiasis, biofilm inhibition, colony-forming units
MeSH terms
Anti-Infective Agents, Candida, Candida albicans, Photochemotherapy, Pichia, Tolonium Chloride, Photosensitizing Agents, Biofilms

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