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DAP12 Inhibits Pulmonary Immune Responses to Cryptococcus neoformans
1Infectious Diseases Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
Infection and Immunity
|April 13, 2016
Summary
The DAP12 protein inhibits immune responses against the fungal pathogen Cryptococcus neoformans. Removing DAP12 improves survival and reduces fungal load in mice, highlighting its role in regulating immunity.
Area of Science:
- Immunology
- Mycology
- Infectious Diseases
Background:
- Cryptococcus neoformans is an opportunistic fungal pathogen causing life-threatening meningoencephalitis in immunocompromised individuals.
- The mammalian immune response to respiratory C. neoformans infection is not fully understood.
- DAP12 is a signaling adapter protein involved in myeloid and NK cell functions, with varied roles in lung infections.
Purpose of the Study:
- To investigate the role of DAP12 in the pulmonary immune response to C. neoformans.
- To determine the impact of DAP12 deficiency on infectious outcomes and immune cell populations in the lungs.
Main Methods:
- Comparison of C. neoformans infection outcomes in DAP12(-/-) mice and wild-type (WT) C57BL/6 mice.
- Analysis of immune cell populations (eosinophils, macrophages, NK cells) in the lungs.
- In vitro assessment of NK cell antifungal activity and macrophage activation.
Main Results:
- DAP12(-/-) mice exhibited improved survival and reduced lung fungal burden compared to WT mice.
- Lungs of infected DAP12(-/-) mice showed decreased eosinophils and macrophages, but increased NK cells.
- DAP12(-/-) NK cells inhibited C. neoformans growth in vitro, and DAP12(-/-) macrophages showed enhanced activation and antifungal activity.
Conclusions:
- DAP12 plays an inhibitory role in the pulmonary immune response to C. neoformans.
- DAP12 acts by promoting pulmonary eosinophilia and suppressing NK cell and macrophage activation and antifungal functions.
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