Author:
Fernández-Calderón María Coronada,Hernández-González Laura,Gómez-Navia Carolina,Blanco-Blanco María Teresa,Sánchez-Silos Rosa,Lucio Leopoldo,Pérez-Giraldo Ciro
Abstract
Abstract
Background
Resistance to traditional antifungal agents is a considerable health problem nowadays, aggravated by infectious processes related to biofilm formation, usually on implantable devices. Therefore, it is necessary to identify new antimicrobial molecules, such as natural products, to develop new therapeutic strategies to prevent and eradicate these infections. One promising product is propolis, a natural resin produced by honeybees with substances from various botanical sources, beeswax and salivary enzymes. The aim of this work was to study the effect of a new Spanish ethanolic extract of propolis (SEEP) on growth, cell surface hydrophobicity, adherence and biofilm formation of Candida glabrata, a yeast capable of achieving high levels of resistance to available anti-fungal agents.
Methods
The antifungal activity of SEEP was evaluated in the planktonic cells of 12 clinical isolates of C. glabrata. The minimum inhibitory concentration (MIC) of propolis was determined by quantifying visible growth inhibition by serial plate dilutions. The minimum fungicide concentration (MFC) was evaluated as the lowest concentration of propolis that produced a 95% decrease in cfu/mL, and is presented as MFC50 and MFC90, which corresponds to the minimum concentrations at which 50 and 90% of the C. glabrata isolates were inhibited, respectively. Influence on cell surface hydrophobicity (CSH) was determined by the method of microbial adhesion to hydrocarbons (MATH). The propolis effect on adhesion and biofilm formation was determined in microtiter plates by measurement of optical density (OD) and metabolic activity (XTT-assay) in the presence of sub-MIC concentrations of SEEP.
Results
SEEP had antifungal capacity against C. glabrata isolates, with a MIC50 of 0.2% (v/v) and an MFC50 of 0.4%, even in azole-resistant strains. SEEP did not have a clear effect on surface hydrophobicity and adhesion, but an inhibitory effect on biofilm formation was observed at subinhibitory concentrations (0.1 and 0.05%) with a significant decrease in biofilm metabolism.
Conclusions
The novel Spanish ethanolic extract of propolis shows antifungal activity against C. glabrata, and decreases biofilm formation. These results suggest its possible use in the control of fungal infections associated with biofilms.
Funder
Consejería de Educación y Empleo, Junta de Extremadura
Publisher
Springer Science and Business Media LLC
Subject
Complementary and alternative medicine
Reference55 articles.
1. Álvez F, Figueras C, Roselló E. Infecciones fúngicas invasivas emergentes. Anales españoles de pediatría. 2010;73(1):52.
2. Bolotin-Fukuhara M, Fairhead C. Candida glabrata: a deadly companion? Yeast. 2014;31(8):279–88. https://doi.org/10.1002/yea.3019.
3. Schell WA, Jones AM, Borroto-Esoda K,Alexander BD. 2017. Antifungal activity of SCY-078 and standard antifungal agents against 178 clinical isolates of resistant and susceptible Candida species. Antimicrob Agents Chemother. 61:e01102–17. https://doi.org/10.1128/AAC.01102-17.
4. Vale-Silva LA, Sanglard D. Tipping the balance both ways: drug resistance and virulence in Candida glabrata. FEMS Yeast Res. 2015;15(4):fov025.
5. Diaz MC, Camponovo R, Araya I, Cerda A, Santander MP, Carrillo-Muñoz AJ. Identification and in vitro antifungal susceptibility of vaginal Candida spp. isolates to fluconazole, clotrimazole and nystatin. Rev Esp Quimioter. 2016;29(3):151–4.
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