Cited by 374Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Plant Pathogen Control

Echinocandin resistance in Candida.

Open access
Perlin, David S.·2015·Clinical Infectious Diseases

Abstract

Invasive fungal infections are an important infection concern for patients with underlying immunosuppression. Antifungal therapy is a critical component of patient care, but therapeutic choices are limited due to few drug classes. Antifungal resistance, especially among Candida species, aggravates the problem. The echinocandin drugs (micafungin, anidulafungin, and caspofungin) are the preferred choice to treat a range of candidiasis. They target the fungal-specific enzyme glucan synthase, which is responsible for the biosynthesis of a major cell wall polymer. Therapeutic failure involves acquisition of resistance, although it is a rare event among most Candida species. However, in some settings, higher-level resistance has been reported among Candida glabrata, which is also frequently resistant to azole drugs, resulting in difficult-to-treat multidrug-resistant strains. The mechanism of echinocandin resistance involves amino acid changes in "hot spot" regions of FKS-encoded subunits of glucan synthase, which decreases the sensitivity of enzyme to drug, resulting in higher minimum inhibitory concentration values. The cellular processes promoting the formation of resistant FKS strains involve complex stress response pathways that yield a variety of adaptive compensatory genetic responses. Standardized broth microdilution techniques can be used to distinguish FKS mutant strains from wild type, but testing C. glabrata with caspofungin should be approached cautiously. Finally, clinical factors that promote echinocandin resistance include prophylaxis, host reservoirs including biofilms in the gastrointestinal tract, and intra-abdominal infections. An understanding of clinical and molecular factors that promote echinocandin resistance is critical to develop better diagnostic tools and therapeutic strategies to overcome resistance.

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Crossref · 10.1093/cid/civ791

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  • In echinocandin-tolerant Candida isolates, β-1,3- and β-1,6-glucan crosslink modifications and higher chitin content have been described.

    “In echinocandin-tolerant Candida isolates, β-1,3- and β-1,6-glucans crosslinks modifications and higher chitin content have been described (Perlin, 2015), while higher β-D-glucan composition has been found in amphotericin-B-resistant Aspergillus flavus isolates (Seo et al., 1999).”

    From Fungal Cell Wall: Emerging Antifungals and Drug Resistance. (2019) · cites this paper as Perlin, 2015

    The Drug Tolerance section describes increased chitin synthesis as a response to echinocandins and says Candida cell-wall mutants with elevated chitin are less susceptible. It does not describe modifications to β-1,3- and β-1,6-glucan crosslinks; it says only that chitin and glucans are biosynthetically interdependent. (LLM, conf=0.88)

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  • Persistent echinocandin exposure leads to FKS mutations and organisms with marked and stable resistance emerge with a high chitin content in the cell wall.

    “Eventually, persistent echinocandin exposure leads to FKS mutations and organisms with marked and stable resistance emerge with a high chitin content in the cell wall (Walker et al., 2013; Perlin, 2015).”

    From Fungal Cell Wall: Emerging Antifungals and Drug Resistance. (2019) · cites this paper as Perlin, 2015

    The Risk Factors for Resistance Emergence section says resistance generally requires prolonged or repeated echinocandin exposure, though it can emerge rapidly. The Drug Tolerance section says tolerant cells can develop stable FKS mutations and higher-level resistance. It links elevated chitin to compensatory drug tolerance, however, not specifically to the organisms that emerge with stable FKS-mediated resistance. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The host environment and antifungal stress can lead to cell wall modifications related to drug resistance.

    “The host environment and antifungal stress can lead to cell wall modifications related to drug resistance.”

    From Fungal Cell Wall: Emerging Antifungals and Drug Resistance. (2019) · cites this paper as Perlin, 2015

    The Drug Tolerance section says echinocandin stress prompts compensatory chitin synthesis that strengthens the cell wall, and cells with elevated chitin are less susceptible to the drugs. The Risk Factors for Resistance Emergence section links host conditions, including gastrointestinal biofilms, to the emergence of resistant mutants, but does not say the host environment itself causes the cell-wall modifications. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • An intermediary step to antifungal resistance is the development of tolerance.

    “An intermediary step to antifungal resistance is the development of tolerance (Perlin, 2015).”

    From Fungal Cell Wall: Emerging Antifungals and Drug Resistance. (2019) · cites this paper as Perlin, 2015

    The Drug Tolerance section says echinocandin-tolerant Candida cells can develop higher-level resistance over time through stable FKS mutations. The Conclusions similarly say drug-adapted persister states may form resistant mutants. This supports tolerance as a possible intermediate state, but not as a necessary step for antifungal resistance generally. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • CSP treatment readily triggers cell wall integrity signaling involving several pathways and transcription factors, leading to cell wall remodeling and stress adaptations such as increased chitin exposure via the activation of chitin synthesis.

    “In line with this, CSP treatment readily triggers cell wall integrity signaling involving several pathways and transcription factors, thus leading to cell wall remodeling and stress adaptations (55, 79) such as increased chitin exposure (80, 81) via the activation of chitin synthesis.”

    From Transcriptomics and Phenotyping Define Genetic Signatures Associated with Echinocandin Resistance in Candida auris (2022) · cites this paper as [79]

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Cites

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Research works printed but not linked: 5

  1. [7]7. Pfaller MA, Castanheira M, Lockhart SR, Ahlquist AM, Messer SA, Jones RN. Frequency of decreased susceptibility and resistance to echi- nocandins among fluconazole-resistant bloodstream isolates of Candi- da glabrata. J Clin Microbiol 2012; 50:1199-203.
  2. [14]14. Johnson ME, Katiyar SK, Edlind TD. A new Fks hotspot for acquired echi- nocandin resistance in yeast, and its contribution to intrinsic resistance of Scedosporium species. Antimicrob Agents Chemother 2011; 55:3774-81.
  3. [17]17. Arendrup MC, Perlin DS, Jensen RH, Howard SJ, Goodwin J, Hope W. Differential In vivo activity of anidulafungin, caspofungin and micafun- gin against C. glabrata with and without FKS resistance mutations. Antimicrob Agents Chemother 2012; 56:2435-42.
  4. [37]37. Ben-Ami R, Garcia-Effron G, Lewis RE, et al. The fitness and virulence cost of fks1 mutations causing echinocandin-resistance in Candida al- bicans. J Infect Dis 2011; 204:626-35.
  5. [72]72. Scott LJ. Micafungin: a review of its use in the prophylaxis and treat- ment of invasive Candida infections. Drugs 2012; 72:2141-65.

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Authors
Perlin, D. S.
Affiliations
Rutgers Health (US)
Corresponding author
Perlin, David S.
Venue
Clinical Infectious Diseases
Published
2015-11-05
Volume
61
Issue
suppl_6
Pages
S612-S617
ISSN
  • 1058-4838 (ISSN-L)
  • 1537-6591
OpenAlex
W2231020609
Cited by
374
References
75
Citations by year
2026: 45 · 2025: 48 · 2024: 28 · 2023: 26 · 2022: 31 · 2021: 47 · 2020: 43 · 2019: 43 · 2018: 23 · 2017: 29 · 2016: 9 · 2015: 1
FWCI
16.09
Type
journal article
Language
en
Open access
Locations
  • Clinical Infectious Diseases (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (AI069397, AI109025)
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
echinocandin resistance, Candida, Candida glabrata, glucan synthase, caspofungin, micafungin, anidulafungin, candidiasis, antifungal resistance, multidrug resistance, stress response pathways, biofilm, prophylaxis, intra-abdominal candidiasis, minimum inhibitory concentration
MeSH terms
Caspofungin, Micafungin, Anidulafungin, Antifungal Agents, Azoles, Candida, Candidiasis, Glucosyltransferases, Humans, Mutation, Drug Resistance, Multiple, Fungal, Candida glabrata, Echinocandins, Lipopeptides, Intraabdominal Infections

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