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Phagocytosis of nonopsonized Cryptococcus neoformans by swine microglia involves CD14 receptors
M M Lipovsky1, G Gekker, W R Anderson
1Department of Medicine, University Hospital Utrecht, The Netherlands.
Abstract:
The interaction of the opportunistic fungus Cryptococcus neoformans with swine microglia was studied in vitro in the presence and absence of anti-CD14 monoclonal antibodies. In the absence of anti-CD14 antibodies, 36% of microglia had phagocytized nonopsonized, encapsulated cryptococci after 2 hr incubation (effector-to-target ratio, 1:50). Preincubation of microglia with anti-CD14 antibodies resulted in a 63% reduction of phagocytosis. These findings suggest that CD14 receptors facilitate uptake of nonopsonized C, neoformans by resident macrophages within the brain.
Insights
CD14 receptors on swine microglia facilitate the uptake of the fungus Cryptococcus neoformans. Blocking these receptors significantly reduced fungal phagocytosis, indicating their crucial role in brain immune responses.
Area of Science:
- Neuroscience
- Immunology
- Mycology
Background:
- Cryptococcus neoformans is an opportunistic fungal pathogen.
- Microglia are the resident macrophages of the central nervous system.
- The interaction between C. neoformans and microglia is critical for controlling fungal infections in the brain.
Purpose of the Study:
- To investigate the role of CD14 receptors in the phagocytosis of nonopsonized Cryptococcus neoformans by swine microglia.
- To determine the effect of anti-CD14 monoclonal antibodies on this interaction.
Main Methods:
- In vitro study using swine microglia and C. neoformans.
- Phagocytosis assay conducted over 2 hours with an effector-to-target ratio of 1:50.
- Microglia were preincubated with or without anti-CD14 monoclonal antibodies.
Main Results:
- In the absence of anti-CD14 antibodies, 36% of microglia phagocytized nonopsonized, encapsulated C. neoformans.
- Preincubation with anti-CD14 antibodies reduced phagocytosis by 63%.
Conclusions:
- CD14 receptors on microglia play a significant role in the uptake of nonopsonized C. neoformans.
- Targeting CD14 may represent a therapeutic strategy to control cryptococcal infections in the brain.