Cited by 35Fungal Infections and StudiesAntifungal resistance and susceptibilityFungal Plant Pathogen Control

From the environment to the host: How non-azole agrochemical exposure affects the antifungal susceptibility and virulence of Cryptococcus gattii

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Bastos, Rafael Wesley, Freitas, Gustavo José Cota, Carneiro, Hellem Cristina Silva, Oliveira, Lorena Vívien Neves, Gouveia-Eufrasio, Ludmila, Santos, Anderson Philip Nonato, Moyrand, Frédérique, Maufrais, Corinne +2 more·2019·Science of The Total Environment

Abstract

Agrochemicals such as the non-azoles, used to improve crop productivity, poses severe undesirable effects on the environment and human health. In addition, they induce cross-resistance (CR) with clinical drugs in pathogenic fungi. However, till date emphasis has been given to the role of azoles on the induction of CR. Herein, we analyzed the effect of a non-azole agrochemical, pyraclostrobin (PCT), on the antifungal susceptibility and virulence of the human and animal pathogens Cryptococcus gattii and C. neoformans. We determined the minimum inhibitory concentration (MIC) of fluconazole (FLC), itraconazole, ravuconazole, amphotericin B, and PCT on colonies: (i) that were not exposed to PCT (non-adapted-NA-cultures), (ii) were exposed at the maximum concentration of PCT (adapted-A-cultures) and (iii) the adapted colonies after cultivation 10 times in PCT-free media (10 passages-10p-cultures). Our results showed that exposure to PCT induced both temporary and permanent CR to clinical azoles in a temperature-dependent manner. With the objective to understand the mechanism of induction of CR through non-azoles, the transcriptomes of NA and 10p cells from C. gattii R265 were analyzed. The transcriptomic analysis showed that expression of the efflux-pump genes (AFR1 and MDR1) and PCT target was higher in resistant 10p cells than that in NA. Moreover, the virulence of 10p cells was reduced as compared to NA cells in mice, as observed by the differential gene expression analysis of genes related to ion-metabolism. Additionally, we observed that FLC could not increase the survival rate of mice infected with 10p cells, confirming the occurrence of permanent CR in vivo. The findings of the present study demonstrate that the non-azole agrochemical PCT can induce permanent CR to clinical antifungals through increased expression of efflux pump genes in resistant cells and that such phenomenon also manifests in vivo.

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Crossref · 10.1016/j.scitotenv.2019.05.094

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  • Laboratory studies have shown that selection for resistance to environmental agrochemicals, primarily through upregulation of ERG11 and drug efflux pumps, can lead to cross-resistance to clinically deployed antifungals.

    “Laboratory studies have shown that selection for resistance to environmental agrochemicals, primarily through the upregulation of the azole target gene ERG11 and drug efflux pumps, can lead to cross-resistance to clinically deployed antifungals19,20.”

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Authors
Bastos, R. W., Freitas, G. J. C., Carneiro, H. C. S., Oliveira, L. V. N., Gouveia-Eufrasio, L., Santos, A. P. N., Moyrand, F., Maufrais, C., Janbon, G., & Santos, D. A.
Affiliations
  • Universidade Federal de Minas Gerais (BR)
  • Institut Pasteur (FR)
Corresponding author
Santos, Daniel Assis
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2019-09
Volume
681
Pages
516-523
ISSN
0048-9697 (ISSN-L)
OpenAlex
W2944566098
Cited by
35
References
44
Citations by year
2026: 4 · 2025: 9 · 2024: 5 · 2023: 3 · 2022: 6 · 2021: 6 · 2020: 2
FWCI
2.66
Type
journal article
Language
en
Open access
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
Funders
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (440010/2018-7, 403006/2016-3)
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
  • Fundação de Amparo à Pesquisa do Estado de Minas Gerais (APQ-00727-16, PPM-00061-18)
Topics
  • Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Fungal Plant Pathogen Control
Keywords
Cryptococcus gattii, Cryptococcus neoformans, pyraclostrobin, cross-resistance, azole resistance, antifungal susceptibility, virulence, efflux pump genes, MDR1, transcriptome, fluconazole, itraconazole, ravuconazole, amphotericin B, temperature-dependent resistance, ion metabolism, mouse infection model
MeSH terms
Strobilurins, Animals, Antifungal Agents, Cryptococcus neoformans, Humans, Microbial Sensitivity Tests, Agrochemicals, Drug Resistance, Fungal, Mice, Cryptococcus gattii

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