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In vivo interaction between alveolar macrophages and Cryptococcus neoformans
K Nessa1, N T Gross, C Jarstrand
1Division of Inhalation Toxicology, Karollnska Institute, Stockholm, Sweden.
Mycopathologia
|January 1, 1997
Summary
Rabbit alveolar macrophages (AM) actively engulf Cryptococcus neoformans, showing increased oxidative metabolism and lower phagolysosomal pH. These immune responses are significant 24 hours post-exposure to the pathogenic yeast.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Cryptococcus neoformans is a significant human pathogen.
- Alveolar macrophages (AM) are key immune cells in the lung.
- Understanding host-pathogen interactions is crucial for developing treatments.
Purpose of the Study:
- To investigate the in vivo interaction between rabbit alveolar macrophages and Cryptococcus neoformans.
- To compare the macrophage response to C. neoformans with that to inert silica particles.
Main Methods:
- Rabbits were intratracheally instilled with labeled C. neoformans or silica particles.
- Alveolar macrophages were collected via lung lavage after 24 hours.
- Phagocytosis, oxidative metabolism (NBT reduction), phagolysosomal pH, and morphology were analyzed.
Main Results:
- AM showed similar attachment of C. neoformans and silica particles, but higher ingestion of yeast.
- Quantitative NBT reduction by AM significantly increased after C. neoformans exposure.
- Phagolysosomal pH was generally lower with C. neoformans compared to silica, with some yeast-containing phagolysosomes showing neutral pH.
Conclusions:
- Rabbit alveolar macrophages exhibit significant phagocytic activity against C. neoformans.
- Exposure to C. neoformans markedly enhances AM oxidative metabolism.
- The phagolysosomal pH environment within AM plays a role in controlling C. neoformans infection.