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Microglial phagocytosis in epilepsy: Mechanisms and impact
Abhijeet S Barath1,2,3, Long-Jun Wu1,3
1Department of Neurology, Mayo Clinic, Rochester, MN, USA.
Abstract:
Microglia are resident immune cells critical in maintaining brain homeostasis via their surveillance and phagocytosis function. Under disease contexts such as seizures and epilepsy, microglial phagocytic signalling is activated in response to both inflammatory and non-inflammatory cell death. This process involves a range of well-characterized 'find me' and 'eat me' signals, phagocytic receptors, and less well-characterized intracellular signalling pathways. In addition, epigenetic and transcriptional regulators orchestrate microglial responses to seizures, including the integration of phagocytic and inflammatory pathways. Interestingly, although inhibiting phagocytosis has been shown to improve neuronal survival and cognitive performance after seizures, it paradoxically increases the risk of developing spontaneous recurrent seizures. Reconciling these dual effects requires a deeper understanding the spatiotemporal dynamics of microglial phagocytosis. The objective of this review is to examine the mechanisms and impact of microglial phagocytosis in the context of epilepsy and to highlight unresolved questions that warrant further investigation in this emerging field.
Insights
Microglia
Area of Science:
- Neuroimmunology
- Cellular Biology
- Epilepsy Research
Background:
- Microglia, the brain's immune cells, maintain homeostasis through surveillance and phagocytosis.
- Microglial phagocytosis is activated during seizures and epilepsy in response to cell death.
- This process involves complex signaling pathways and epigenetic regulation.
Purpose of the Study:
- To review the mechanisms and impact of microglial phagocytosis in epilepsy.
- To highlight unresolved questions regarding microglial phagocytosis in seizure disorders.
- To understand the dual role of phagocytosis in neuronal survival and seizure recurrence.
Main Methods:
- Literature review of microglial function in epilepsy.
- Analysis of signaling pathways ('find me'/'eat me' signals, receptors).
- Examination of epigenetic and transcriptional regulation of microglial responses.
Main Results:
- Microglial phagocytosis is a key response to seizures, involving intricate signaling.
- Inhibiting phagocytosis can improve neuronal survival but paradoxically increase seizure risk.
- The spatiotemporal dynamics of phagocytosis are crucial for understanding its dual effects.
Conclusions:
- A deeper understanding of microglial phagocytosis dynamics is needed to reconcile its effects in epilepsy.
- Further research is warranted to explore the complex role of microglia in seizure disorders.
- Investigating microglial phagocytosis offers potential therapeutic avenues for epilepsy management.
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