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Nat Commun. 2018 Mar 12;9(1):1032. doi: 10.1038/s41467-018-03427-1.

Vesicular glutamate release from central axons contributes to myelin damage.

Author information

1
University of Plymouth, Plymouth, PL6 8BY, UK.
2
University of Malta, Msida, MSF 2080, Malta.
3
University of Plymouth, Plymouth, PL6 8BY, UK. Robert.fern@plymouth.ac.uk.

Abstract

The axon myelin sheath is prone to injury associated with N-methyl-D-aspartate (NMDA)-type glutamate receptor activation but the source of glutamate in this context is unknown. Myelin damage results in permanent action potential loss and severe functional deficit in the white matter of the CNS, for example in ischemic stroke. Here, we show that in rats and mice, ischemic conditions trigger activation of myelinic NMDA receptors incorporating GluN2C/D subunits following release of axonal vesicular glutamate into the peri-axonal space under the myelin sheath. Glial sources of glutamate such as reverse transport did not contribute significantly to this phenomenon. We demonstrate selective myelin uptake and retention of a GluN2C/D NMDA receptor negative allosteric modulator that shields myelin from ischemic injury. The findings potentially support a rational approach toward a low-impact prophylactic therapy to protect patients at risk of stroke and other forms of excitotoxic injury.

PMID:
29531223
PMCID:
PMC5847599
DOI:
10.1038/s41467-018-03427-1
[Indexed for MEDLINE]
Free PMC Article

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