The Glycosylphosphatidylinositol-Anchored Protease Sap9 Modulates the Interaction of Candida albicans with Human Neutrophils
Open accessAbstract
Human polymorphonuclear neutrophils (PMNs) play a major role in the immune defense against invasive Candida albicans infection. This fungal pathogen produces a set of aspartic proteases that directly contributes to virulence properties such as adhesion, tissue invasion, and immune evasion. We show here that, in contrast to other secreted proteases, the cell surface-associated isoform Sap9 has a major impact on the recognition of C. albicans by PMNs. SAP9 is required for the induction of PMN chemotaxis toward C. albicans filaments, an essential prerequisite of effective PMN activation. Furthermore, deletion of SAP9 leads to a mitigated release of reactive oxygen intermediates (ROI) in human PMNs and decreases C. albicans -induced apoptosis triggered by ROI formation. In confrontation assays, killing of a SAP9 deletion mutant is reduced in comparison to wild-type C. albicans . These data clearly implicate Sap9 protease activity in the initiation of protective innate immunity and suggest novel molecular mechanisms in C. albicans -host interaction leading to neutrophil activation.
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Increased Sap9 expression has been associated with adhesion to epithelial cells and epithelial damage during oral infection, making it an important mediator of host-pathogen interactions.
“Increased Sap9 expression has been associated with adhesion to epithelial cells and epithelial damage during oral infection [62], making it an important mediator of host-pathogen interactions [65].”
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“Increased Sap9 expression has been associated with adhesion to epithelial cells and epithelial damage during oral infection [62], making it an important mediator of host-pathogen interactions [65].”
BackgroundProteolytic Cleavage of Covalently Linked Cell Wall Proteins by Candida albicans Sap9 and Sap10
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- Authors
- Hornbach, A., Heyken, A., Schild, L., Hube, B., Löffler, J., & Kurzai, O.
- Affiliations
- University of Würzburg (DE)
- Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie e. V. - Hans-Knöll-Institut (HKI) (DE)
- University of Würzburg, Department of Internal Medicine II, Würzburg, Germany
- Corresponding author
- Kurzai, Oliver
- Venue
- Infection and Immunity
- Publisher
- American Society for Microbiology
- Published
- 2009-12
- Volume
- 77
- Issue
- 12
- Pages
- 5216-5224
- ISSN
- 0019-9567 (ISSN-L)
- 1098-5522
- PMC
- PMC2786460
- OpenAlex
- W2114844963
- Cited by
- 47
- References
- 61
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 2 · 2019: 4 · 2017: 4 · 2016: 3 · 2015: 3 · 2014: 5 · 2013: 4 · 2012: 7
- FWCI
- 3.21
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Infection and Immunity (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- 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 › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
- Keywords
- Candida albicans, neutrophils, aspartic protease, GPI-anchored proteins, neutrophil chemotaxis, reactive oxygen species, neutrophil apoptosis, innate immunity, fungal virulence, host-pathogen interaction, neutrophil killing
- MeSH terms
- Candida albicans, Fungal Proteins, Humans, Immunologic Factors, Neutrophils, Aspartic Acid Endopeptidases, Gene Deletion, Reactive Oxygen Species, Cell Migration Assays, Leukocyte
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