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Meral Ocal M, Aydin M, Sumlu E, Korucu EN, Ozturk A (2025) Myricetin Exerts Antibiofilm Effects on Candida albicans by Targeting the RAS1/cAMP/EFG1 Pathway and Disruption of the Hyphal Network. J Fungi (Basel) 11(5)
Pubmed Entry


Abstract:Increasing antifungal resistance and side effects of existing drugs demand alternative approaches for treating Candida (C.) infections. This study aimed to comprehensively evaluate the antifungal efficacy of myricetin (MYR), a natural flavonoid, against both fluconazole (FLC)-resistant and susceptible clinical Candida strains, with a particular focus on its inhibitory effects on C. albicans biofilms. Antifungal susceptibility was evaluated on Candida spp. by the broth microdilution method, and the impact of myricetin on C. albicans biofilms was determined using the Cell Counting Kit-8 (CCK-8) assay. To understand the molecular mechanisms underlying the antibiofilm properties of myricetin, expression analysis of genes in the RAS1/cAMP/EFG1 pathway (ALS3, HWP1, ECE1, UME6, HGC1) and cAMP-dependent protein kinase regulation (RAS1, CYR1, EFG1) involved in the transition from yeast to hyphae was performed. Field emission scanning electron microscopy (FESEM) was used to study the ultrastructural changes and morphological dynamics of Candida biofilms after exposure to MYR and FLC. The in vivo toxicity of myricetin was evaluated by survival analysis using the Galleria mellonella model. Myricetin significantly suppressed key genes related to hyphae development (RAS1, CYR1, EFG1, UME6, and HGC1) and adhesion (ALS3 and HWP1) in both clinical and reference Candida strains at a concentration of 640 microg/mL. FESEM analysis revealed that myricetin inhibited hyphae growth and elongation in C. albicans. This study highlights the promising antibiofilm potential of myricetin through a significant inhibition of biofilm formation and hyphal morphogenesis.
Status: Published Type: Journal Article PubMed ID: 40422732


Topics addressed in this paper
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Topics
Topics not linked to GenesGenes linked to topics
ALS3
(C. albicans)
CYR1
(C. albicans)
ECE1
(C. albicans)
EFG1
(C. albicans)
HGC1
(C. albicans)
HWP1
(C. albicans)
RAS1
(C. albicans)
UME6
(C. albicans)
Biofilms
Candida albicans







Candida glabrata







Candida krusei







Candida lusitaniae







Candida parapsilosis







Candida tropicalis







Filamentous Growth
Other Candida







RNA Levels and Processing
Sensitivity/response to drugs/other treatments
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