Volume 26, Issue 8 pp. 1810-1819
ORIGINAL ARTICLE

Antifungal activity of Punicalagin–nystatin combinations against Candida albicans

Rafaela Alves da Silva

Rafaela Alves da Silva

Integrated Research Center, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: Conceptualization, ​Investigation, Methodology, Visualization, Writing - original draft, Writing - review & editing

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Bella Luna Colombini Ishikiriama

Bella Luna Colombini Ishikiriama

Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: ​Investigation, Writing - review & editing

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Marcelo Milanda Ribeiro Lopes

Marcelo Milanda Ribeiro Lopes

Integrated Research Center, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: ​Investigation, Writing - original draft

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Ricardo Dias de Castro

Ricardo Dias de Castro

Department of Clinical and Social Dentistry, Federal University of Paraíba, Castelo Branco III, João Pessoa, Brazil

Contribution: Methodology, Validation, Writing - original draft

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Cindy Ruiz Garcia

Cindy Ruiz Garcia

Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: Formal analysis, Methodology, Writing - original draft

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Vinicius Carvalho Porto

Vinicius Carvalho Porto

Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: Formal analysis, Writing - original draft

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Carlos Ferreira Santos

Carlos Ferreira Santos

Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: Conceptualization, Funding acquisition, Writing - original draft, Writing - review & editing

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Karin Hermana Neppelenbroek

Corresponding Author

Karin Hermana Neppelenbroek

Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Correspondence

Karin Hermana Neppelenbroek, Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo (USP), Alameda Dr. Octávio Pinheiro Brisolla, 9-75, 17012-901 Bauru, São Paulo, Brazil.

Email: [email protected]

Contribution: Project administration, Validation, Writing - original draft, Writing - review & editing

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Vanessa Soares Lara

Vanessa Soares Lara

Department of Surgery, Stomatology, Pathology and Radiology, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil

Contribution: Conceptualization, Project administration, Supervision, Validation, Visualization, Writing - original draft, Writing - review & editing

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First published: 24 June 2020
Citations: 11

Abstract

Objectives

Oral candidiasis is the most common opportunistic fungal infection of oral mucosa and results from an overgrowth of Candida, especially Candida albicans. The potential anti-C. albicans and cytotoxicity of punicalagin (PCG), isolated from Punica granatum, alone or with nystatin (NYS) were evaluated.

Methods

Activity of compounds alone or in combinations was determined against two C. albicans strains (ATCC 90028 and SC5314). Minimal inhibitory concentration (MIC)-50 and Minimum Fungicidal Concentration (MFC) were assessed by XTT assay and CFU counts, respectively. For combinations, determination of fractional inhibitory concentration index was performed. Ergosterol pathway was investigated as a possible PCG antifungal mechanism. Cytotoxicity assays were undertaken on human primary oral keratinocytes and gingival fibroblasts incubated with antifungal concentrations of PCG and/or NYS for 24 hr.

Results

Combination of NYS and PCG increased antifungal efficacy, compared with compounds tested alone. Combinations 4 (PCG-6.25 μg/ml; NYS-3.9 μg/ml) and 5 (PCG-12.5 μg/ml; NYS-1.95 μg/ml) were more effective since they reduced the MIC-50 of PCG (50 μg/ml) by 8 and 4 times, respectively, increased the candidal inhibition and nullified the PCG cytotoxicity for keratinocytes. PCG antifungal mechanism did not involve ergosterol biosynthesis pathway.

Conclusions

The favorable outcomes for combination of PCG and NYS encourage further testing this therapeutic strategy against C. albicans.

CONFLICTS OF INTEREST

None to declare.

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