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It's all in your head: antifungal immunity in the brain
Brendan D Snarr1, Rebecca A Drummond2, Michail S Lionakis1
1Fungal Pathogenesis Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy & Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
Abstract:
As the incidence rate of invasive fungal infections has increased with the use of modern medical interventions, so too has the occurrence of fungi invading the brain. Fungi such as Candida albicans, Cryptococcus neoformans, and Aspergillus fumigatus often infect immunocompromised individuals, and can use several strategies to invade the central nervous system (CNS) by penetrating the blood-brain barrier. Once in the brain parenchyma the specialized resident immune cells need to effectively recognize the fungus and mount an appropriate immune response to clear the infection, without causing debilitating immune-mediated toxicity and neuronal damage. Here we review the current knowledge pertaining to the antifungal response of the CNS and highlight areas where future research is required.
Insights
Fungal brain infections are rising in immunocompromised patients. This review details the central nervous system's (CNS) antifungal defenses and identifies research gaps for better treatment strategies.
Area of Science:
- Neuroscience
- Immunology
- Mycology
Background:
- Invasive fungal infections are increasing due to modern medical interventions.
- Fungal invasion of the brain (fungal neuroinvasion) is a growing concern, particularly in immunocompromised individuals.
- Pathogenic fungi like Candida albicans, Cryptococcus neoformans, and Aspergillus fumigatus can breach the blood-brain barrier to enter the central nervous system (CNS).
Purpose of the Study:
- To review current knowledge on the CNS's antifungal immune response.
- To highlight the mechanisms fungi use to invade the CNS.
- To identify critical areas for future research in fungal neuroinvasion and CNS immunity.
Main Methods:
- Literature review of existing research on fungal neuroinvasion.
- Analysis of immune cell functions within the CNS during fungal infections.
- Synthesis of current understanding of host-pathogen interactions at the blood-brain barrier and within brain parenchyma.
Main Results:
- The CNS possesses specialized resident immune cells, primarily microglia, that detect and respond to fungal pathogens.
- Fungi employ diverse strategies to penetrate the blood-brain barrier and establish infection within the brain.
- Balancing effective fungal clearance with minimizing immune-mediated neuronal damage is a key challenge in CNS antifungal immunity.
Conclusions:
- Understanding the CNS antifungal response is crucial for managing invasive fungal neuroinfections.
- Further research is needed to elucidate specific immune pathways and develop targeted therapies.
- Future studies should focus on optimizing immune responses to clear fungi while preserving neurological function.
