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PMID: 10234016 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Muscarinic control of cytoskeleton in perisynaptic glia.

Georgiou J, Robitaille R, Charlton MP

Abstract

Similar to astrocytes at CNS synapses, perisynaptic Schwann cells (PSCs) surround nerve terminals at the neuromuscular junction (NMJ). These special teloglial cells are sensitive to neurotransmitters and upregulate glial fibrillary acidic protein (GFAP) when deprived of synaptic activity. We found that activation of muscarinic acetylcholine receptors (mAChRs) at PSCs, but not purinergic (ATP and adenosine) or peptidergic [substance P (SP) and calcitonin gene-related peptide (CGRP)] receptors, prevented this upregulation. When applied onto single PSCs, muscarine evoked Ca2+ responses that fatigued but prevented upregulation of this glial cytoskeletal protein. Application of ATP onto single PSCs evoked Ca2+ signals that showed little fatigue, and GFAP upregulation occurred. Thus, Ca2+ signals alone cannot prevent GFAP upregulation in the PSCs. After blockade of cholinergic receptors by gallamine, neuronal activity was not effective in maintaining low GFAP levels in the perisynaptic glia. Last, immunohistochemistry disclosed mAChRs on PSCs and nearby fibroblasts. Thus, acetylcholine secreted by the nerve terminal acts on the PSCs via mAChRs to regulate GFAP. Cytoskeletal changes may influence perisynaptic glial functions, including growth, remodeling, and modulation of the synapse.

MeSH Terms
Animals Calcium/metabolism Cytoskeleton/physiology Glial Fibrillary Acidic Protein/metabolism Muscarinic Antagonists/pharmacology Neurotransmitter Agents/physiology Rana pipiens Receptors, Muscarinic/physiology Schwann Cells/metabolism,physiology Signal Transduction/physiology Synapses/physiology Up-Regulation
Chemicals
Glial Fibrillary Acidic Protein Muscarinic Antagonists Neurotransmitter Agents Receptors, Muscarinic Calcium
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Georgiou J
Department of Physiology, Medical Research Council Group in Nerve Cells and Synapses, and Neuroscience Network, University of Toronto, Toronto, Ontario, Canada M5S 1A8.
Robitaille R
Charlton M P
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Article Info
Journal
The Journal of neuroscience : the official journal of the Society for Neuroscience
Abbr.
J Neurosci
ISSN
1529-2401
Published
1999-05-15
Pages
3836-46
Language
English
Region
United States
NLM ID
8102140
PMCID
PMC6782737
Subset
IM
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