Cited by 109Antifungal resistance and susceptibilityFungal Plant Pathogen ControlFungal and yeast genetics research

Echinocandin Resistance in Candida Species: Mechanisms of Reduced Susceptibility and Therapeutic Approaches

Beyda, Nicholas D, Lewis, Russell E, Garey, Kevin W·2012·Annals of Pharmacotherapy

Abstract

OBJECTIVE: To summarize published data regarding mechanisms of reduced echinocandin susceptibility in Candida spp., the impact of echinocandin resistance on the fitness and virulence of Candida isolates, and current and future treatment approaches. DATA SOURCES: A search of MEDLINE databases (1966-September 2011) was conducted. STUDY SELECTION AND DATA EXTRACTION: Databases were searched using the terms echinocandin, resistance, and Candida. Citations from publications were reviewed for additional references. DATA SYNTHESIS: Echinocandins have in vitro activity against most Candida spp. and are first-line agents in the treatment of candidemia. However, case reports describing echinocandin treatment failure due to resistant isolates have been published. Reduced echinocandin susceptibility has been shown to occur via 3 main mechanisms: (1) adaptive stress responses, which result in elevated cell wall chitin content and paradoxical growth in vitro at supra minimum inhibitory concentrations (MICs); (2) acquired FKS mutations, which confer reduced glucan synthase sensitivity, elevated MICs, and are associated with clinical failure; and (3) intrinsic FKS mutations, which are naturally occurring mutations in C. parapsilosis and C. guilliermondii, which confer elevated MIC levels but a lower level of reduced glucan synthase sensitivity compared with acquired FKS mutations. Some FKS mutants have been shown to have significantly reduced fitness and virulence versus wild type isolates and may contribute to the low incidence of echinocandin resistance reported in large surveillance studies. Treatment strategies evaluated for FKS mutants include echinocandin dose escalation and combination with agents such as calcineurin inhibitors, HSP90 inhibitors, and chitin synthase inhibitors. CONCLUSIONS: While the incidence of echinocandin resistance in Candida spp. is low, it can present a significant therapeutic challenge, especially in multidrug-resistant Candida isolates. Dose escalation is unlikely to be effective in treating FKS mutant isolates, and significant adverse effects limit the clinical use of agents evaluated as combination therapy. Patients with infections failing to respond to echinocandin therapy should undergo susceptibility testing and be treated with an alternative antifungal agent if possible.

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Crossref · 10.1345/aph.1r020

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  • Intrinsic FKS mutations result in elevated MIC levels but lower level of reduced β-1,3-d-glucan synthase sensitivity compared with acquired FKS mutations.

    “intrinsic FKS mutations, also resulting in elevated MIC levels (but in a lower level of reduced β-1,3-d-glucan synthase sensitivity when compared with the acquired FKS mutations) [118,120,121].”

    From Candida glabrata Biofilms: How Far Have We Come? (2017) · cites this paper as [118]

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Authors
Beyda, N. D., Lewis, R. E., & Garey, K. W.
Affiliations
University of Houston (US)
Venue
Annals of Pharmacotherapy
Published
2012-07
Volume
46
Issue
7-8
Pages
1086-1096
ISSN
  • 0012-6578 (ISSN-L)
  • 1060-0280
  • 1542-6270
OpenAlex
W2123330154
Cited by
109
References
69
Citations by year
2026: 5 · 2025: 8 · 2024: 9 · 2023: 5 · 2022: 5 · 2021: 5 · 2020: 5 · 2019: 6 · 2018: 9 · 2017: 5 · 2016: 5 · 2015: 16 · 2014: 13 · 2013: 11 · 2012: 2
FWCI
1.68
Type
journal article
Language
en
Open access
closed
Locations
  • Annals of Pharmacotherapy (publishedVersion)
  • PubMed (publishedVersion)
  • Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Fungal Plant Pathogen Control
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
Keywords
echinocandin resistance, Candida, reduced susceptibility, glucan synthase, adaptive stress response, chitin content, candidemia, antifungal treatment failure, dose escalation, calcineurin inhibitors, Hsp90 inhibitors, chitin synthase inhibitors, virulence, Candida parapsilosis, Candida guilliermondii, multidrug resistance
MeSH terms
Antifungal Agents, Candida, Candidiasis, Glucosyltransferases, Humans, Microbial Sensitivity Tests, Mutation, Drug Resistance, Fungal, Echinocandins

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