A Potent Fluorescent Derivative of 8-Hydroxyquinoline Suggests Cell Wall Damage as a Possible Cellular Action of the 5-Triazole 8-Hydroxyquinoline Class
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applmicrobiol-05-00038-v2.pdf
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Author(s)
Gentz, Caroline de Bem
Lopes, Marcela Silva
Quatrin, Priscilla Maciel
Gionbelli, Mariana Pies
de Cesare, Maycon Antonio
Perin, Ana Paula
Lopes, William
Fuentefria, Alexandre Meneghello
Vainstein, Marilene Henning
Andrade, Saulo Fernandes de
Date Issued
April 10, 2025
Journal
Applied Microbiology
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Gentz, C.d.B.; Lopes, M.S.; Quatrin, P.M.; Gionbelli, M.P.; de Cesare, M.A.; Perin, A.P.; Lopes, W.; Fuentefria, A.M.; Vainstein, M.H.; Andrade, S.F.d. A Potent Fluorescent Derivative of 8-Hydroxyquinoline Suggests Cell Wall Damage as a Possible Cellular Action of the 5-Triazole 8-Hydroxyquinoline Class. Appl. Microbiol. 2025, 5, 38.
Version
Final published version
Abstract
Fungal infections are a major but often neglected global health challenge, affecting both human health and agricultural productivity. Current treatments are limited by few drug classes and increasing multidrug resistance, exacerbated by the widespread use of antifungal agents in clinical and agricultural settings. This study investigates the antifungal potential of a novel 8-hydroxyquinoline derivative with a triazole core at the 5-position, synthesized to improve both efficacy and mechanistic understanding as a fluorescent chemical probe. Biological assays demonstrated significant antifungal activity of compound 10 against a range of pathogens, which was active against all Candida species, dermatophytes, and Fusarium solani with MIC values ranging from 0.5 to 4 µg/mL. Confocal fluorescence microscopy of treated fungal cells was conducted and showed a high accumulation of compound 10 at the cell edge. To further investigate the mode of action, results from a sorbitol protection assay suggested a possible cell wall action, and scanning electron microscopy (SEM) revealed cell wall disruption, such as cell shrinkage and surface roughness, in treated fungal cells. These findings highlight the 8-hydroxyquinoline-triazole scaffold as a promising antifungal agent with cell wall damage properties, providing a basis for future therapeutic development against human and plant fungal pathogens.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.3390/applmicrobiol5020038
