Antidermatophytic activity of synthetic peptides: Action mechanisms and clinical application as adjuvants to enhance the activity and decrease the toxicity of Griseofulvin.

Autor: Souza PFN; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Lima PG; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Freitas CDT; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Sousa DOB; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Neto NAS; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Dias LP; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Vasconcelos IM; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Freitas LBN; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Silva RGG; Department of Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Sousa JS; Department of Physics, Federal University of Ceará, Fortaleza, Ceará, Brazil., Silva AFB; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil., Oliveira JTA; Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, Ceará, Brazil.
Jazyk: angličtina
Zdroj: Mycoses [Mycoses] 2020 Sep; Vol. 63 (9), pp. 979-992. Date of Electronic Publication: 2020 Aug 07.
DOI: 10.1111/myc.13138
Abstrakt: Background: Dermatophytes belonging to the Trichophyton genus are important human pathogens, but they have developed resistance to griseofulvin, the most common antifungal drug used to treat dermatophytosis.
Objective: This study was aimed to evaluate the antidermatophytic activity of synthetic peptides, as well as mechanisms of action and synergistic effect with griseofulvin.
Methods: Scanning electron microscopy (SEM), atomic force microscopy (AFM) and fluorescence microscopy (FM) were employed to understand the activity and the mechanism of action of peptides.
Results: Here we report that synthetic peptides at 50 μg/mL, a concentration 20-fold lower than griseofulvin, reduced the microconidia viability of T. mentagrophytes and T. rubrum by 100%, whereas griseofulvin decreased their viability by only 50% and 0%, respectively. The action mechanism of peptides involved cell wall damage, membrane pore formation and loss of cytoplasmic content. Peptides also induced overproduction of reactive oxygen species (ROS) and enhanced the activity of griseofulvin 10-fold against both fungi, suggesting synergistic effects, and eliminated the toxicity of this drug to human erythrocytes. Docking analysis revealed ionic and hydrophobic interactions between peptides and griseofulvin, which may explain the decline of griseofulvin toxicity when mixed with peptides.
Conclusion: Therefore, our results strongly suggest six peptides with high potential to be employed alone as new drugs or as adjuvants to enhance the activity and decrease the toxicity of griseofulvin.
(© 2020 Blackwell Verlag GmbH.)
Databáze: MEDLINE
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