Cited by 63Fungal Infections and StudiesHeat shock proteins researchAntifungal resistance and susceptibility

Inhibition of heat-shock protein 90 enhances the susceptibility to antifungals and reduces the virulence of Cryptococcus neoformans/Cryptococcus gattii species complex

Cordeiro, Rossana de Aguiar, Evangelista, Antonio José de Jesus, Serpa, Rosana, Marques, Francisca Jakelyne de Farias, Melo, Charlline Vládia Silva de, Oliveira, Jonathas Sales de, Franco, Jônatas da Silva, Alencar, Lucas Pereira de +4 more·2016·Microbiology

Abstract

Heat-shock proteins (Hsps) are chaperones required for the maintenance of cellular homeostasis in different fungal pathogens, playing an important role in the infectious process. This study investigated the effect of pharmacological inhibition of Hsp90 by radicicol on the Cryptococcus neoformans/Cryptococcus gattii species complex--agents of the most common life-threatening fungal infection amongst immunocompromised patients. The influence of Hsp90 inhibition was investigated regarding in vitro susceptibility to antifungal agents of planktonic and sessile cells, ergosterol concentration, cell membrane integrity, growth at 37 °C, production of virulence factors in vitro, and experimental infection in Caenorhabditis elegans. Hsp90 inhibition inhibited the in vitro growth of planktonic cells of Cryptococcus spp. at concentrations ranging from 0.5 to 2 μg ml(-1) and increased the in vitro inhibitory effect of azoles, especially fluconazole (FLC) (P < 0.05). Inhibition of Hsp90 also increased the antifungal activity of azoles against biofilm formation and mature biofilms of Cryptococcus spp., notably for Cryptococcus gattii. Furthermore, Hsp90 inhibition compromised the permeability of the cell membrane, and reduced planktonic growth at 37 °C and the capsular size of Cryptococcus spp. In addition, Hsp90 inhibition enhanced the antifungal activity of FLC during experimental infection using Caenorhabditis elegans. Therefore, our results indicate that Hsp90 inhibition can be an important strategy in the development of new antifungal drugs.

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Crossref · 10.1099/mic.0.000222

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Authors
Cordeiro, R. D. A., Evangelista, A. J. D. J., Serpa, R., Marques, F. J. D. F., Melo, C. V. S. D., Oliveira, J. S. D., Franco, J. D. S., Alencar, L. P. D., Bandeira, T. D. J. P. G., Brilhante, R. S. N., Sidrim, J. J. C., & Rocha, M. F. G.
Affiliations
  • Universidade Federal do Ceará (BR)
  • Specialized Medical Mycology Center,Federal University of Ceará,Fortaleza, CE, Brazil
  • Universidade Estadual do Ceará (BR)
Venue
Microbiology
Published
2016-02-01
Volume
162
Issue
2
Pages
309-317
ISSN
  • 1350-0872 (ISSN-L)
  • 1465-2080
OpenAlex
W2227223477
Cited by
63
References
42
Citations by year
2026: 2 · 2025: 5 · 2024: 4 · 2023: 7 · 2022: 7 · 2021: 10 · 2020: 9 · 2019: 5 · 2018: 5 · 2017: 5 · 2016: 4
FWCI
3.67
Type
journal article
Language
en
Open access
closed
Locations
  • Microbiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
Keywords
HSP90, HSP90 inhibition, radicicol, Cryptococcus neoformans, Cryptococcus gattii, cryptococcosis, antifungal susceptibility, fluconazole, azoles, biofilm formation, plasma membrane integrity, capsular polysaccharide, virulence factors, Caenorhabditis elegans infection model, immunocompromised patients
MeSH terms
Amphotericin B, Animals, Antifungal Agents, Cell Membrane, Cryptococcosis, Cryptococcus neoformans, Ergosterol, Humans, Melanins, Microbial Sensitivity Tests, Plankton, Fluconazole, Caenorhabditis elegans, Itraconazole, Biofilms, HSP90 Heat-Shock Proteins, Cryptococcus gattii, Voriconazole

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