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Decoding Mast Cell-Microglia Communication in Neurodegenerative Diseases
Jagdeep K Sandhu1,2, Marianna Kulka3,4
1Human Health Therapeutics Research Centre, National Research Council Canada, 1200 Montreal Road, Ottawa, ON K1A 0R6, Canada.
Abstract:
Microglia, resident immune cells of the central nervous system (CNS), play a pivotal role in immune surveillance and maintenance of neuronal health. Mast cells are also important resident immune cells of the CNS but they are underappreciated and understudied. Both microglia and mast cells are endowed with an array of signaling receptors that recognize microbes and cellular damage. As cellular sensors and effectors in the CNS, they respond to many CNS perturbations and have been implicated in neuroinflammation and neurodegeneration. Mast cells contain numerous secretory granules packaged with a plethora of readily available and newly synthesized compounds known as 'mast cell mediators'. Mast cells act as 'first responders' to a pathogenic stimuli and respond by degranulation and releasing these mediators into the extracellular milieu. They alert other glial cells, including microglia to initiate neuroinflammatory processes that culminate in the resolution of injury. However, failure to resolve the pathogenic process can lead to persistent activation, release of pro-inflammatory mediators and amplification of neuroinflammatory responses, in turn, resulting in neuronal dysfunction and demise. This review discusses the current understanding of the molecular conversation between mast cells and microglia in orchestrating immune responses during two of the most prevalent neurodegenerative diseases, namely Alzheimer's disease and Parkinson's disease. Here we also survey the potential emerging therapeutic approaches targeting common pathways in mast cells and microglia to extinguish the fire of inflammation.
Insights
Microglia and mast cells, key CNS immune cells, interact during neuroinflammation. Understanding their communication offers new therapeutic targets for neurodegenerative diseases like Alzheimer's and Parkinson's.
Area of Science:
- Neuroimmunology
- Neuroinflammation
- Neurodegenerative Diseases
Background:
- Microglia are the primary immune cells in the central nervous system (CNS), crucial for immune surveillance and neuronal health.
- Mast cells, though understudied, are also vital resident immune cells in the CNS, acting as 'first responders' to stimuli.
- Both cell types possess receptors sensing damage and microbes, participating in neuroinflammatory and neurodegenerative processes.
Purpose of the Study:
- To review the molecular dialogue between mast cells and microglia in neuroinflammation.
- To explore the roles of mast cell-microglia interactions in Alzheimer's disease and Parkinson's disease.
- To survey potential therapeutic strategies targeting shared pathways in these cells for neurodegenerative conditions.
Main Methods:
- Literature review of neuroimmunology and neurodegenerative disease research.
- Analysis of molecular signaling pathways between mast cells and microglia.
- Survey of current and emerging therapeutic approaches.
Main Results:
- Mast cells release mediators that alert microglia, initiating neuroinflammatory responses.
- Dysregulated mast cell-microglia communication can amplify inflammation, leading to neuronal dysfunction.
- Shared pathways in mast cells and microglia are implicated in Alzheimer's and Parkinson's disease pathogenesis.
Conclusions:
- The interaction between mast cells and microglia is critical in orchestrating CNS immune responses.
- Targeting mast cell-microglia pathways presents a promising therapeutic avenue for neurodegenerative diseases.
- Further research into this cellular crosstalk may unlock novel treatments for conditions like Alzheimer's and Parkinson's disease.
