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Dysmyelinated lower motor neurons retract and regenerate dysfunctional synaptic terminals.


ABSTRACT: Axonal degeneration is the major cause of permanent neurological disability in individuals with inherited diseases of myelin. Axonal and neuronal changes that precede axonal degeneration, however, are not well characterized. We show here that dysmyelinated lower motor neurons retract and regenerate dysfunctional presynaptic terminals, leading to severe neurological disability before axonal degeneration. In addition, dysmyelination led to a decreased synaptic quantal content, an indicator of synaptic dysfunction. The amplitude and rise time of miniature endplate potentials were also increased, but these changes were primarily consistent with an increase in the passive membrane properties of the transgenic muscle fibers. Maintenance of synaptic connections should be considered as a therapeutic target for slowing progression of neurological disability in primary diseases of myelin.

SUBMITTER: Yin X 

PROVIDER: S-EPMC6729343 | biostudies-literature | 2004 Apr

REPOSITORIES: biostudies-literature

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Dysmyelinated lower motor neurons retract and regenerate dysfunctional synaptic terminals.

Yin Xinghua X   Kidd Grahame J GJ   Pioro Erik P EP   McDonough Jennifer J   Dutta Ranjan R   Feltri M Laura ML   Wrabetz Lawrence L   Messing Albee A   Wyatt Ryan M RM   Balice-Gordon Rita J RJ   Trapp Bruce D BD  

The Journal of neuroscience : the official journal of the Society for Neuroscience 20040401 15


Axonal degeneration is the major cause of permanent neurological disability in individuals with inherited diseases of myelin. Axonal and neuronal changes that precede axonal degeneration, however, are not well characterized. We show here that dysmyelinated lower motor neurons retract and regenerate dysfunctional presynaptic terminals, leading to severe neurological disability before axonal degeneration. In addition, dysmyelination led to a decreased synaptic quantal content, an indicator of syna  ...[more]

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