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Microglia Depletion-Induced Remodeling of Extracellular Matrix and Excitatory Synapses in the Hippocampus of Adult Mice
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Microglia Depletion-Induced Remodeling of Extracellular Matrix and Excitatory Synapses in the Hippocampus of Adult Mice
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Journal Article
Microglia Depletion-Induced Remodeling of Extracellular Matrix and Excitatory Synapses in the Hippocampus of Adult Mice
2021
Overview
The extracellular matrix (ECM) plays a key role in synaptogenesis and the regulation of synaptic functions in the central nervous system. Recent studies revealed that in addition to dopaminergic and serotoninergic neuromodulatory systems, microglia also contribute to the regulation of ECM remodeling. In the present work, we investigated the physiological role of microglia in the remodeling of perineuronal nets (PNNs), predominantly associated with parvalbumin-immunopositive (PV+) interneurons, and the perisynaptic ECM around pyramidal neurons in the hippocampus. Adult mice were treated with PLX3397 (pexidartinib), as the inhibitor of colony-stimulating factor 1 receptor (CSF1-R), to deplete microglia. Then, confocal analysis of the ECM and synapses was performed. Although the elimination of microglia did not alter the overall number or intensity of PNNs in the CA1 region of the hippocampus, it decreased the size of PNN holes and elevated the expression of the surrounding ECM. In the neuropil area in the CA1 str. radiatum, the depletion of microglia increased the expression of perisynaptic ECM proteoglycan brevican, which was accompanied by the elevated expression of presynaptic marker vGluT1 and the increased density of dendritic spines. Thus, microglia regulate the homeostasis of pre- and postsynaptic excitatory terminals and the surrounding perisynaptic ECM as well as the fine structure of PNNs enveloping perisomatic—predominantly GABAergic—synapses.
Publisher
MDPI AG,MDPI
Subject
/ Animals
/ Brain
/ brevican
/ CA1 Region, Hippocampal - drug effects
/ CA1 Region, Hippocampal - metabolism
/ CA1 Region, Hippocampal - pathology
/ CX3C Chemokine Receptor 1 - genetics
/ Electrical Synapses - metabolism
/ Electrical Synapses - pathology
/ Excitatory Postsynaptic Potentials
/ Extracellular Matrix - metabolism
/ Extracellular Matrix - pathology
/ gamma-Aminobutyric Acid - metabolism
/ Green Fluorescent Proteins - genetics
/ Green Fluorescent Proteins - metabolism
/ Luminescent Proteins - genetics
/ Luminescent Proteins - metabolism
/ Macrophage colony-stimulating factor
/ Male
/ Neuropil
/ Power
/ Proteins
/ synapses
