Cited by 181Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Infections and Studies

Role of Hyphal Formation in Interactions of Candida albicans with Endothelial Cells

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Phan, Quynh T., Belanger, Paul H., Filler, Scott G.·2000·Infection and Immunity

Abstract

The ability to change from yeast to hyphal morphology is a major virulence determinant of Candida albicans . Mutants with defined defects in filamentation regulatory pathways have reduced virulence in mice. However, is it poorly understood why hyphal formation is critical for C. albicans to cause hematogenously disseminated infections. We used recently constructed mutants to examine the role of hyphal formation in the interactions of C. albicans with endothelial cells in vitro. These interactions included the ability of the mutants to invade and injure endothelial cells. Because the formation of hyphae may influence the host inflammatory response to C. albicans , we also investigated the capacity of these mutants to stimulate endothelial cells to express E-selectin and intercellular adhesion molecule 1. We infected endothelial cells with C. albicans strains containing homozygous null mutations in the following filamentation regulatory genes: CLA4 , CPH1 , EFG1 , and TUP1 . Whereas the wild-type strain formed true hyphae on endothelial cells, we found that neither the Δ efg1 nor the Δ cph1 Δefg1 double mutant germinated. The Δ tup1 mutant formed only pseudohyphae. We also found that the Δ efg1 , Δ cph1 Δefg1 , and Δ tup1 mutants had significantly reduced capacities to invade and injure endothelial cells. Therefore, Efg1p and Tup1p contribute to virulence by regulating hyphal formation and the factors that enable C. albicans to invade and injure endothelial cells. With the exception of the Δcph1 Δefg1 mutant, all other mutants stimulated endothelial cells to express at least one of the leukocyte adhesion molecules. Therefore, the combined activities of Cph1p and Efg1p are required for C. albicans to stimulate a proinflammatory response in endothelial cells.

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Crossref · 10.1128/iai.68.6.3485-3490.2000

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  • Host cell invasion and damage are likely critical virulence attributes of C. albicans because mutants with defects in these processes in vitro are highly likely to have attenuated virulence in experimental animal models of hematogenously disseminated or oropharyngeal candidiasis.

    “Host cell invasion and damage are likely critical virulence attributes of C. albicans because mutants with defects in these processes in vitro are highly likely to have attenuated virulence in experimental animal models of hematogenously disseminated or oropharyngeal candidiasis [5][6][7][8].”

    From Als3 Is a Candida albicans Invasin That Binds to Cadherins and Induces Endocytosis by Host Cells (2007) · cites this paper as [7]

    Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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  • Induction of endocytosis is passive on the part of C. albicans because killed hyphae are endocytosed as avidly as live hyphae.

    “Furthermore, studies with killed organisms indicate that induction of endocytosis is passive on the part of the organism because killed hyphae are endocytosed as avidly as are live hyphae [5,7].”

    From Als3 Is a Candida albicans Invasin That Binds to Cadherins and Induces Endocytosis by Host Cells (2007) · cites this paper as [7]

    The Results report that nearly 70% of methanol-fixed germ tubes were taken up by endothelial cells, and the Discussion says killed C. albicans cells can be endocytosed. This supports endocytosis without a living organism’s active participation, but the paper does not compare uptake of killed and live hyphae or establish that it is equally avid. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • C. albicans mutants with defects in the signal transduction pathways that govern hyphal formation have a significantly reduced capacity to invade both endothelial and oral epithelial cells in vitro.

    “We have found previously that C. albicans mutants with defects in the signal transduction pathways that govern hyphal formation have a significantly reduced capacity to invade both endothelial and oral epithelial cells in vitro [5][6][7].”

    From Als3 Is a Candida albicans Invasin That Binds to Cadherins and Induces Endocytosis by Host Cells (2007) · cites this paper as [7]

    The Results report reduced endothelial-cell endocytosis for several filamentation mutants, with the greatest reductions in Δefg1, Δcph1 Δefg1, and Δtup1. They also state that Δcph1 was not significantly different from wild type. The paper's experiments concern endothelial cells, not oral epithelial cells, so this source does not support the oral-cell portion of the claim. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • C. albicans invades both endothelial cells and oral epithelial cells in vitro by inducing its own endocytosis.

    “Previously, we have found that C. albicans invades both endothelial cells and oral epithelial cells in vitro by inducing its own endocytosis [4,5,7].”

    From Als3 Is a Candida albicans Invasin That Binds to Cadherins and Induces Endocytosis by Host Cells (2007) · cites this paper as [7]

    The Results (page not provided) state that C. albicans invades endothelial cells in vitro predominantly by inducing its own endocytosis, and report endocytosis in the endothelial-cell experiments. Our copy does not address invasion of oral epithelial cells, so it supports only the endothelial-cell part of the sentence. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Authors
Phan, Q. T., Belanger, P. H., & Filler, S. G.
Affiliations
University of California, Los Angeles (US)
Venue
Infection and Immunity
Published
2000-06
Volume
68
Issue
6
Pages
3485-3490
ISSN
  • 0019-9567 (ISSN-L)
  • 1098-5522
OpenAlex
W2134152581
Cited by
181
References
31
Citations by year
2025: 2 · 2024: 2 · 2023: 3 · 2022: 4 · 2021: 4 · 2020: 6 · 2019: 2 · 2018: 8 · 2017: 4 · 2016: 4 · 2015: 6 · 2014: 13 · 2013: 7 · 2012: 7
FWCI
6.28
Type
journal article
Language
en
Open access
Locations
  • Infection and Immunity (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Burroughs Wellcome Fund
  • National Institutes of Health
  • National Institute of Allergy and Infectious Diseases (P01 AI-37194, R29AI040636, R01AI019990, R01-AI19990, P01AI037194)
  • National Center for Research Resources (M01RR000425)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
Keywords
Candida albicans, hyphal development, filamentation, endothelial cells, pseudohyphae, endothelial cell invasion, leukocyte adhesion molecules, E-selectin, ICAM-1, inflammation, virulence, yeast-to-hypha transition
MeSH terms
Candida albicans, DNA-Binding Proteins, Endocytosis, Endothelium, Vascular, Fungal Proteins, Genes, Fungal, Humans, Morphogenesis, Mutation, Nuclear Proteins, Repressor Proteins, Transcription Factors, Protein Serine-Threonine Kinases, Intercellular Adhesion Molecule-1, E-Selectin, Saccharomyces cerevisiae Proteins

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