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Type: Artigo de Periódico
Title: Effect of farnesol on growth, ergosterol biosynthesis, and cell permeability in Coccidioides posadasii
Authors: Caetano, Erica Pacheco
Brilhante, Raimunda Sâmia Nogueira
Lima, Rita Amanda Chaves de
Leite, João Jaime Giffoni
Castelo-Branco, Débora de Souza Collares Maia
Ribeiro, Joyce Fonteles
Pinheiro, Tereza de Jesus
Cordeiro, Rossana de Aguiar
Monteiro, André Jalles
Sidrim, José Júlio Costa
Rocha, Marcos Fábio Gadelha
Keywords: Coccidioidomicose;Fungos
Issue Date: May-2013
Publisher: Antimicrobial Agents and Chemotherapy
Citation: CAETANO, E P. et al. Effect of farnesol on growth, ergosterol biosynthesis, and cell permeability in Coccidioides posadasii. Antimicrobial Agents and Chemotherapy, Washington, v. 57, n. 5, p. 2167-70, maio, 2013.
Abstract: Coccidioidomycosis is a systemic mycosis caused by the dimorphic fungi Coccidioides spp. The treatment for chronic and/or disseminated coccidioidomycosis can be prolonged and complicated. Therefore, the search for new drugs is necessary. Farnesol is a precursor in the sterol biosynthesis pathway that has been shown to present antifungal activity. Thus, the objective of this study was to evaluate the in vitro antifungal activity of farnesol alone and in combination with antifungal agents against clinical and environmental strains of Coccidioides posadasii as well as to determine their effect on the synthesis of ergosterol and on cell permeability. This study employed the broth macrodilution method to determine the MIC of farnesol against 18 strains of C. posadasii. Quantification of ergosterol was performed with 10 strains of C. posadasii after exposure to subinhibitory concentrations of farnesol. Finally, the activity of farnesol was evaluated in the presence of osmotic stress, induced by the addition of NaCl to the culture medium, during the susceptibility tests. The results showed that farnesol exhibited low MICs (ranging from 0.00171 to 0.01369 mg/liter) against all tested strains. The combination of farnesol with the antifungals showed synergistic effects (fractional inhibitory concentration index [FICI]<0.5). As for the ergosterol quantification, it was observed that exposure to subinhibitory concentrations of farnesol decreased the amount of ergosterol extracted from the fungal cells. Furthermore, farnesol also showed lower MIC values when the strains were subjected to osmotic stress, indicating the action of this compound on the fungal membrane. Thus, due to the high in vitro antifungal activity, this work brings perspectives for the performance of in vivo studies to further elucidate the effects of farnesol on the host cells.
ISSN: 0066-4804 Impressa
1098-6596 On line
Appears in Collections:DMC - Artigos publicados em revistas científicas

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