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Beta-1,2-linked oligomannosides inhibit Candida albicans binding to murine macrophage
Abstract:
Interaction of Candida albicans with cells of the macrophage lineage was examined by using heat-killed (HK) and live yeast cells. Laminarin, an analogue of the cell wall beta-glucans, strongly inhibited HK yeasts adherence to J774 cell line but had no effect on live yeast binding. Phosphopeptidomannan (PPM) from Saccharomyces cerevisiae had a limited effect on the binding of both HK and live yeasts but significant inhibition was achieved by the use of C. albicans PPM. The role of beta-1,2-oligomannosides was examined with regard to their exclusive presence within C. albicans PPM. PPM acid labile beta-1,2-oligomannosides or a synthetic beta-1,2-mannotetraose, inhibited yeasts binding in a manner comparable to the original PPM. These latter results were confirmed by using mouse peritoneal macrophages, thus suggesting a general role for beta-1,2-oligomannosides in the adherence of the yeast to the macrophage membrane.
Insights
Beta-1,2-oligomannosides on Candida albicans yeast cell walls are key to binding with macrophage cells. This interaction is crucial for understanding fungal immune responses and developing new antifungal strategies.
Area of Science:
- Mycology
- Immunology
- Cell Biology
Background:
- Candida albicans is an opportunistic fungal pathogen that interacts with host immune cells like macrophages.
- Understanding the molecular mechanisms of this interaction is vital for developing effective antifungal therapies.
Purpose of the Study:
- To investigate the role of specific yeast cell wall components in the adherence of Candida albicans to macrophages.
- To identify key molecular structures mediating yeast-macrophage interactions.
Main Methods:
- Utilized heat-killed (HK) and live Candida albicans yeast cells for adherence assays.
- Employed laminarin and phosphopeptidomannan (PPM) from Saccharomyces cerevisiae and C. albicans.
- Tested synthetic beta-1,2-mannotetraose and acid-labile PPM fractions.
- Confirmed findings using mouse peritoneal macrophages.
Main Results:
- Laminarin inhibited HK yeast adherence but not live yeast binding.
- C. albicans PPM significantly inhibited yeast adherence, unlike S. cerevisiae PPM.
- Beta-1,2-oligomannosides within C. albicans PPM, including synthetic beta-1,2-mannotetraose, were identified as key inhibitors of yeast adherence.
- These findings were consistent across different macrophage models.
Conclusions:
- Beta-1,2-oligomannosides are critical for Candida albicans adherence to macrophages.
- Targeting these structures could represent a novel therapeutic strategy against C. albicans infections.