Cited by 647Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Plant Pathogen Control

Mechanisms of Antifungal Drug Resistance

Open access
Cowen, Leah E., Sanglard, Dominique, Howard, Susan J., Rogers, P. David, Perlin, David S.·2015·Cold Spring Harbor Perspectives in Medicine

Abstract

Antifungal therapy is a central component of patient management for acute and chronic mycoses. Yet, treatment choices are restricted because of the sparse number of antifungal drug classes. Clinical management of fungal diseases is further compromised by the emergence of antifungal drug resistance, which eliminates available drug classes as treatment options. Once considered a rare occurrence, antifungal drug resistance is on the rise in many high-risk medical centers. Most concerning is the evolution of multidrug- resistant organisms refractory to several different classes of antifungal agents, especially among common Candida species. The mechanisms responsible are mostly shared by both resistant strains displaying inherently reduced susceptibility and those acquiring resistance during therapy. The molecular mechanisms include altered drug affinity and target abundance, reduced intracellular drug levels caused by efflux pumps, and formation of biofilms. New insights into genetic factors regulating these mechanisms, as well as cellular factors important for stress adaptation, provide a foundation to better understand the emergence of antifungal drug resistance.

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Crossref · 10.1101/cshperspect.a019752

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  • Growth conditions influence the degree of tolerance exhibited by a strain.

    “In addition to genetic determinants of tolerance level, growth conditions influence the degree of tolerance exhibited by a strain.”

    From Drug resistance and tolerance in fungi. (2020) · cites this paper as [68]

    The Biofilms section reports that biofilm growth makes normally susceptible planktonic cells highly resistant, supporting the broader point that growth state affects drug response. The Adaptive Cellular Factors section discusses drug tolerance, but our copy does not directly establish that growth conditions change the degree of tolerance exhibited by a given strain. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Calcineurin inhibitors reduce echinocandin tolerance.

    “whereas calcineurin inhibitors reduce echinocandin tolerance (measured using MIC assays analyzed after 72 h)68,78.”

    From Drug resistance and tolerance in fungi. (2020) · cites this paper as [68]

    The Adaptive Cellular Factors section says calcineurin signaling helps fungi survive echinocandin-induced stress, and Drug Resistance Mechanisms reports that calcineurin inhibitors eliminate paradoxical growth at high echinocandin concentrations. This supports reduced tolerance, but our copy does not establish the specified measurement by MIC assays analyzed after 72 hours. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Studies using inhibitors or mutant strains showed that these pathways reduce fungal growth in combination with caspofungin or anidulafungin.

    “Specifically, studies of these pathways using either inhibitors or mutant strains showed they reduce fungal growth in combination with caspofungin or anidulafungin.”

    From Drug resistance and tolerance in fungi. (2020) · cites this paper as [68]

    The Cell Integrity Circuit section reports that deleting pathway genes increases susceptibility to echinocandins and that kinase inhibitors act synergistically with echinocandins against fungi. The Hsp90 section likewise reports reduced echinocandin tolerance after genetic or pharmacological compromise. These passages support the general finding, but do not establish the claimed growth reduction specifically in combination with caspofungin or anidulafungin; they describe inhibiting the pathways, not the pathways themselves reducing growth. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Many core stress response pathways in C. albicans, including Hsp90, Ca2+-calmodulin-calcineurin, lysine deacetylases, protein kinase C and HOG pathways, also affect echinocandin responses.

    “Importantly, many of these same core stress response pathways in C. albicans (Hsp90, Ca2+-calmodulin-calcineurin, lysine deacetylases, protein kinase C and HOG (high osmolarity glycerol responses) pathways) t also affect echinocandin responses68,86,87.”

    From Drug resistance and tolerance in fungi. (2020) · cites this paper as [68]

    The Hsp90, Chitin Synthesis, and Cell Integrity Circuit sections link Hsp90, calcineurin, PKC, and HOG signaling to echinocandin responses in C. albicans. The Hsp90 and Related Factors section discusses lysine deacetylases in relation to C. albicans azole resistance, but does not establish their effect on its echinocandin responses. Page numbers are not available in our copy. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Tolerance is not a function of either uptake or efflux rates.

    “but that tolerance is not a function of either uptake or efflux rates, despite the well-known role of efflux in drug resistance [65][66][67][68][69] .”

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Authors
Cowen, L. E., Sanglard, D., Howard, S. J., Rogers, P. D., & Perlin, D. S.
Affiliations
  • University of Toronto (CA)
  • Centre Hospitalier Universitaire Vaudois (CH)
  • University of Liverpool (GB)
  • University of Tennessee Health Science Center (US)
  • Rutgers, The State University of New Jersey (US)
Venue
Cold Spring Harbor Perspectives in Medicine
Published
2014-11-10
Volume
5
Issue
7
Pages
a019752
ISSN
2157-1422 (ISSN-L)
OpenAlex
W2136677555
Cited by
647
References
222
Citations by year
2026: 55 · 2025: 64 · 2024: 79 · 2023: 77 · 2022: 78 · 2021: 74 · 2020: 71 · 2019: 53 · 2018: 40 · 2017: 21 · 2016: 23 · 2015: 12
Type
posted content
Language
en
Open access
Locations
  • Cold Spring Harbor Perspectives in Medicine (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • IRIS (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion)
Funders
  • National Institutes of Health (2r01ai109025-11)
  • National Institute of Allergy and Infectious Diseases (R01AI058145, R01AI-109025)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Fungal Plant Pathogen Control
Keywords
antifungal resistance, Candida, multidrug resistance, efflux pumps, biofilm, drug target alterations, stress adaptation, fungal infection, acquired resistance, molecular mechanisms of resistance
MeSH terms
Antifungal Agents, Humans, Mycoses, Biofilms, RNA Stability, Drug Resistance, Fungal

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