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The Neuromuscular Junction01:19

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Motoneuron Wnts regulate neuromuscular junction development.

Chengyong Shen1, Lei Li2, Kai Zhao3

  • 1Department of Neurology, the First Affiliated Hospital, Institute of Translational Medicine, School of Medicine, Zhejiang University, Zhejiang, China.

Elife
|August 17, 2018
PubMed
Summary
This summary is machine-generated.

Motoneuron Wnt secretion is crucial for neuromuscular junction (NMJ) development, ensuring stable nerve terminals and proper muscle function. Disruption impairs presynaptic assembly and neurotransmission.

Keywords:
Wntmouseneuromuscular junctionneurosciencepresynapsesynapse

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • The neuromuscular junction (NMJ) is vital for motor control, but presynaptic assembly mechanisms remain poorly understood.
  • Previous studies lacked genetic evidence for Wnt signaling's role in mammalian NMJ development due to Wnt complexity.

Purpose of the Study:

  • To investigate the role of Wnt ligand secretion mediator (Wls) in motoneuron-specific Wnt secretion during NMJ development.
  • To elucidate the impact of impaired Wnt secretion on NMJ structure and function.

Main Methods:

  • Generated mutant mice with Wls gene deletion specifically in motoneurons.
  • Analyzed NMJ morphology, synaptic vesicle distribution, and neurotransmission in mutant and control mice.
  • Conducted rescue experiments using Wnt7A and Wnt7B to identify key Wnt ligands.

Main Results:

  • Motoneuron-specific Wls ablation caused muscle weakness and impaired neurotransmission.
  • NMJs in mutants exhibited instability, reduced junctional folds, fragmented acetylcholine receptor (AChR) clusters, swollen nerve terminals, and mislocalized synaptic vesicles.
  • Presynaptic deficits preceded postsynaptic deficits, and phenotypes were absent when Wls was deleted in muscles or Schwann cells.
  • Wnt7A and Wnt7B were identified as critical Wnts for nerve terminal development.

Conclusions:

  • Motoneuron-derived Wnts are essential for proper NMJ development, particularly for presynaptic differentiation.
  • Targeting motoneuron Wnt secretion offers a potential therapeutic strategy for NMJ disorders.