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Microglia as hackers of the matrix: sculpting synapses and the extracellular space
Joshua D Crapser1, Miguel A Arreola1, Kate I Tsourmas1
1Department of Neurobiology and Behavior, University of California, Irvine, CA, USA.
Abstract:
Microglia shape the synaptic environment in health and disease, but synapses do not exist in a vacuum. Instead, pre- and postsynaptic terminals are surrounded by extracellular matrix (ECM), which together with glia comprise the four elements of the contemporary tetrapartite synapse model. While research in this area is still just beginning, accumulating evidence points toward a novel role for microglia in regulating the ECM during normal brain homeostasis, and such processes may, in turn, become dysfunctional in disease. As it relates to synapses, microglia are reported to modify the perisynaptic matrix, which is the diffuse matrix that surrounds dendritic and axonal terminals, as well as perineuronal nets (PNNs), specialized reticular formations of compact ECM that enwrap neuronal subsets and stabilize proximal synapses. The interconnected relationship between synapses and the ECM in which they are embedded suggests that alterations in one structure necessarily affect the dynamics of the other, and microglia may need to sculpt the matrix to modify the synapses within. Here, we provide an overview of the microglial regulation of synapses, perisynaptic matrix, and PNNs, propose candidate mechanisms by which these structures may be modified, and present the implications of such modifications in normal brain homeostasis and in disease.
Insights
Microglia regulate the brain's extracellular matrix (ECM), influencing synaptic function in health and disease. This study explores how microglia shape the perisynaptic matrix and perineuronal nets (PNNs).
Area of Science:
- Neuroscience
- Cell Biology
- Extracellular Matrix Research
Background:
- Synapses are embedded within an extracellular matrix (ECM), forming a tetrapartite unit with glia.
- Microglia, the brain's immune cells, are increasingly recognized for their role beyond immune surveillance.
- The interplay between microglia, ECM, and synapses is crucial for brain function and dysfunction.
Purpose of the Study:
- To provide an overview of microglial regulation of the synaptic ECM.
- To explore mechanisms by which microglia modify the perisynaptic matrix and perineuronal nets (PNNs).
- To discuss the implications of microglial-ECM interactions in brain homeostasis and disease.
Main Methods:
- Literature review and synthesis of existing research on microglia-ECM-synapse interactions.
- Conceptual framework development for microglial regulation of ECM components.
- Analysis of evidence linking microglial activity to ECM dynamics.
Main Results:
- Microglia actively regulate the perisynaptic matrix and perineuronal nets (PNNs).
- These microglial-ECM interactions are vital for maintaining synaptic function during homeostasis.
- Dysregulation of these processes by microglia is implicated in neurological diseases.
Conclusions:
- Microglia play a significant role in sculpting the ECM environment surrounding synapses.
- Understanding microglial-ECM dynamics offers new insights into synaptic plasticity and neurological disorders.
- Targeting microglial modulation of the ECM may present therapeutic strategies for brain diseases.
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