Cited by 311Fungal and yeast genetics researchHeat shock proteins researchAntifungal resistance and susceptibility

Hsp90 Orchestrates Temperature-Dependent Candida albicans Morphogenesis via Ras1-PKA Signaling

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Shapiro, Rebecca S., Uppuluri, Priya, Zaas, Aimee K., Collins, Cathy, Senn, Heather, Perfect, John R., Heitman, Joseph, Cowen, Leah E.·2009·Current Biology

Abstract

Background Hsp90 is an environmentally contingent molecular chaperone that influences the form and function of diverse regulators of cellular signaling. Hsp90 potentiates the evolution of fungal drug resistance by enabling crucial cellular stress responses. Here we demonstrate that in the leading fungal pathogen of humans, Candida albicans, Hsp90 governs cellular circuitry required not only for drug resistance but also for the key morphogenetic transition from yeast to filamentous growth that is crucial for virulence. This transition is normally regulated by environmental cues, such as exposure to serum, that are contingent upon elevated temperature to induce morphogenesis. The basis for this temperature dependence has remained enigmatic.Results We show that compromising Hsp90 function pharmacologically or genetically induces a transition from yeast to filamentous growth in the absence of external cues. Elevated temperature relieves Hsp90-mediated repression of the morphogenetic program. Hsp90 regulates morphogenetic circuitry by repressing Ras1-PKA signaling. Modest Hsp90 compromise enhances the phenotypic effects of activated Ras1 signaling whereas deletion of positive regulators of the Ras1-PKA cascade blocks the morphogenetic response to Hsp90 inhibition. Consistent with the requirement for morphogenetic flexibility for virulence, depletion of C. albicans Hsp90 attenuates virulence in a murine model of systemic disease.Conclusions Hsp90 governs the integration of environmental cues with cellular signaling to orchestrate fungal morphogenesis and virulence, suggesting new therapeutic strategies for life-threatening infectious disease. Hsp90's capacity to govern a key developmental program in response to temperature change provides a new mechanism that complements the elegant repertoire that organisms utilize to sense temperature.

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Crossref · 10.1016/j.cub.2009.03.017

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  • The MAL2p-HSP90/hsp90Δ strain has a modest reduction of Hsp90 levels even when fully induced in maltose, and growth in glucose/maltose dramatically reduces Hsp90 levels and reduces growth rate and stationary phase density.

    “Under these conditions, the MAL2p-HSP90/hsp90Δ strain has reduced growth rate and reaches approximately half the stationary phase cell density as a wild-type strain [40].”

    From Hsp90 Governs Echinocandin Resistance in the Pathogenic Yeast Candida albicans via Calcineurin (2009) · cites this paper as [40]

    The Results section reports that Hsp90 depletion reduced growth rates, supporting that part of the claim. It also says the depletion had little effect on stationary-phase cell density (Figure S1D), rather than reducing it to approximately half the wild-type density. The same section reports moderately reduced Hsp90 in the MAL2p-HSP90/hsp90Δ strain grown in maltose. (LLM, conf=0.89)

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  • Previous work established that genetic reduction of Hsp90 levels enhances the efficacy of fluconazole in a murine model of disseminated C. albicans infection and that further genetic depletion of C. albicans Hsp90 results in complete clearance of an infection in the murine model.

    “Our previous work established that genetic reduction of Hsp90 levels enhances the efficacy of fluconazole in a murine model of disseminated C. albicans infection [22] and that further genetic depletion of C. albicans Hsp90 results in complete clearance of an infection in the murine model [40].”

    From Hsp90 Governs Echinocandin Resistance in the Pathogenic Yeast Candida albicans via Calcineurin (2009) · cites this paper as [40]

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  • The UTR2-lacZ reporter is activated by calcium chloride and reports calcineurin activation.

    “As expected, exposure of cells containing the UTR2-lacZ reporter to calcium chloride resulted in activation of calcineurin relative to the untreated control (P<0.001, ANOVA, Bonferroni's Multiple Comparison Test Figure 4C).”
  • Hsp90 modulates key virulence traits in C. albicans, such as morphogenesis, and genetic compromise of Hsp90 leads to clearance of otherwise lethal Candida or Aspergillus infections in animal models.

    “Hsp90 also modulates key virulence traits in C. albicans, such as the ability to undergo morphogenesis, and in animal models, genetic compromise of Hsp90 function leads to clearance of otherwise lethal Candida or Aspergillus infections (Cowen et al. 2009; Shapiro et al. 2009).”
  • Hsp90 functions as a signaling hub, stabilizing various signal transducers that modulate key fungal virulence phenotypes.

    “Hsp90 functions as a signaling hub, stabilizing various signal transducers that modulate key fungal virulence phenotypes (Cowen and Lindquist 2005; Shapiro et al. 2009; O’Meara et al. 2019; Hossain et al. 2020).”

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Authors
Shapiro, R. S., Uppuluri, P., Zaas, A. K., Collins, C., Senn, H., Perfect, J. R., Heitman, J., & Cowen, L. E.
Affiliations
  • University of Toronto (CA)
  • Duke Medical Center (US)
Corresponding author
Cowen, Leah E.
Venue
Current Biology
Publisher
Elsevier BV
Published
2009-04
Volume
19
Issue
8
Pages
621-629
ISSN
0960-9822 (ISSN-L)
OpenAlex
W1967864456
Cited by
311
References
50
Citations by year
2026: 8 · 2025: 14 · 2024: 14 · 2023: 11 · 2022: 10 · 2021: 25 · 2020: 20 · 2019: 18 · 2018: 23 · 2017: 15 · 2016: 28 · 2015: 19 · 2014: 16 · 2013: 18 · 2012: 24
FWCI
9.67
Type
journal article
Language
en
Open access
Locations
  • Current Biology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Allergy and Infectious Diseases (AI 73896, R56AI028388, AI28388, R01AI073896, R01AI028388, AI-50438, R01AI050438, K08AI065837)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
Keywords
HSP90, Candida albicans, fungal morphogenesis, yeast-to-hypha transition, temperature dependence, fungal virulence, drug resistance, molecular chaperones, antifungal therapy
MeSH terms
Animals, Candida albicans, Candidiasis, Fungal Proteins, Humans, Isoenzymes, Morphogenesis, Signal Transduction, Cyclic AMP-Dependent Protein Kinases, ras Proteins, HSP90 Heat-Shock Proteins, GTPase-Activating Proteins, Hyphae, Mice, Quorum Sensing, Cyclic Nucleotide Phosphodiesterases, Type 1, Cyclic Nucleotide Phosphodiesterases, Type 2

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