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Candida albicans biofilm–induced vesicles confer drug resistance through matrix biogenesis

Journal Article · · PLoS Biology (Online)
 [1];  [2];  [2];  [2];  [3];  [4];  [2];  [5];  [5];  [6];  [2];  [7]
  1. Univ. of Wisconsin, Madison, WI (United States); DOE/OSTI
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Univ. of Wroclaw (Poland)
  4. Ernst Moritz Arndt Univ. Greifswalk (Germany)
  5. Univ. of Georgia, Athens, GA (United States)
  6. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  7. Univ. of Iowa, Iowa City, IA (United States)

Cells from all kingdoms of life produce extracellular vesicles (EVs). Their cargo is protected from the environment by the surrounding lipid bilayer. EVs from many organisms have been shown to function in cell–cell communication, relaying signals that impact metazoan development, microbial quorum sensing, and pathogenic host–microbe interactions. Here, we have investigated the production and functional activities of EVs in a surface-associated microbial community or biofilm of the fungal pathogen Candida albicans. Crowded communities like biofilms are a context in which EVs are likely to function. Biofilms are noteworthy because they are encased in an extracellular polymeric matrix and because biofilm cells exhibit extreme tolerance to antimicrobial compounds. We found that biofilm EVs are distinct from those produced by free-living planktonic cells and display strong parallels in composition to biofilm matrix material. The functions of biofilm EVs were delineated with a panel of mutants defective in orthologs of endosomal sorting complexes required for transport (ESCRT) subunits, which are required for normal EV production in diverse eukaryotes. Most ESCRT-defective mutations caused reduced biofilm EV production, reduced matrix polysaccharide levels, and greatly increased sensitivity to the antifungal drug fluconazole. Matrix accumulation and drug hypersensitivity of ESCRT mutants were reversed by addition of wild-type (WT) biofilm EVs. Vesicle complementation showed that biofilm EV function derives from specific cargo proteins. Our studies indicate that C. albicans biofilm EVs have a pivotal role in matrix production and biofilm drug resistance. Biofilm matrix synthesis is a community enterprise; prior studies of mixed cell biofilms have demonstrated extracellular complementation. Therefore, EVs function not only in cell–cell communication but also in the sharing of microbial community resources.

Research Organization:
Univ. of Georgia, Athens, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Institute of Allergy and Infectious Diseases (NIAID)
Grant/Contract Number:
SC0015662
OSTI ID:
1612320
Journal Information:
PLoS Biology (Online), Journal Name: PLoS Biology (Online) Journal Issue: 10 Vol. 16; ISSN 1545-7885
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Extracellular vesicles secreted by Saccharomyces cerevisiae are involved in cell wall remodelling journal August 2019
A Novel Protocol for the Isolation of Fungal Extracellular Vesicles Reveals the Participation of a Putative Scramblase in Polysaccharide Export and Capsule Construction in Cryptococcus gattii journal March 2019
Extracellular Vesicle-Mediated RNA Release in Histoplasma capsulatum journal March 2019
Recent advances in understanding Candida albicans hyphal growth journal May 2019
Characterization of Aspergillus fumigatus Extracellular Vesicles and Their Effects on Macrophages and Neutrophils Functions journal September 2019
Linking Cellular Morphogenesis with Antifungal Treatment and Susceptibility in Candida Pathogens journal February 2019
Selection of potential anti-adhesion drugs by in silico approaches targeted to ALS3 from Candida albicans journal October 2019
Answers to naysayers regarding microbial extracellular vesicles journal July 2019
Copper-only superoxide dismutase enzymes and iron starvation stress in Candida fungal pathogens journal December 2019
Probiotic Yeasts Inhibit Virulence of Non -albicans Candida Species journal October 2019
Pseudomonas aeruginosa Leucine Aminopeptidase Influences Early Biofilm Composition and Structure via Vesicle-Associated Antibiofilm Activity journal December 2019

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