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Published on: June 2, 2023
Immunotherapy for fungal infections with special emphasis on central nervous system infections
Iyer G Parameswaran1, Brahm H Segal
1Division of Infectious Diseases, University at Buffalo School of Medicine, Buffalo, NY, USA.
Abstract:
Opportunistic fungal infections are major causes of morbidity and mortality in the immunocompromized. Fungi have evolved complex and coordinated mechanisms to survive in the environment and the mammalian host. Fungi must adapt to "stressors" in the host, including nutrient scarcity, pH and reactive oxygen and nitrogen intermediates, in addition to evading host immunity. Knowledge of the immunopathogenesis of fungal infections has paved the way to promising strategies for immunotherapy. These include strategies that increase phagocyte number, activate innate host defense pathways in phagocytes and dendritic cells and stimulate antigen-specific immunity (e.g, vaccines). Immunotherapy must be tailored to specific immunocompromized states. Our review focuses on cryptococcosis and coccidioidomycosis because of the propensity of these diseases to involve the central nervous system (CNS). The CNS has long been considered "immunologically privileged" in the sense of being isolated from normal immune surveillance. This notion is only partially accurate. Immune-based therapies for fungal CNS disease are at an exploratory level and merit further evaluation in clinical trials.
Insights
Opportunistic fungal infections pose significant risks to immunocompromised individuals. Immunotherapy strategies, including vaccines, show promise for treating fungal diseases like cryptococcosis and coccidioidomycosis, especially those affecting the central nervous system (CNS).
Area of Science:
- Mycology
- Immunology
- Infectious Diseases
Background:
- Opportunistic fungal infections are a leading cause of illness and death in immunocompromised patients.
- Fungi possess sophisticated survival mechanisms against host defenses and environmental challenges like nutrient scarcity and immune evasion.
Purpose of the Study:
- To review immunopathogenesis of fungal infections.
- To explore immunotherapy strategies for fungal diseases, particularly cryptococcosis and coccidioidomycosis affecting the central nervous system (CNS).
Main Methods:
- Literature review focusing on fungal immunopathogenesis and immunotherapy.
- Analysis of fungal adaptation to host stressors and immune evasion tactics.
- Examination of immunotherapy approaches including enhancing phagocyte function and stimulating adaptive immunity.
Main Results:
- Fungal infections present complex challenges due to fungal adaptation and host immune evasion.
- Immunotherapy strategies aim to boost host defenses, including phagocyte activation and antigen-specific immunity.
- Cryptococcosis and coccidioidomycosis, with their propensity for CNS involvement, are key areas for therapeutic development.
Conclusions:
- Understanding fungal immunopathogenesis is crucial for developing effective immunotherapies.
- Therapeutic strategies must be personalized to specific immunocompromised states.
- Immune-based therapies for fungal CNS infections are in early stages and require further clinical investigation.
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