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Related Concept Videos

The Neuromuscular Junction01:19

The Neuromuscular Junction

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Neuromuscular Junction And Blockade01:29

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Related Experiment Video

Updated: Aug 19, 2025

The Fibular Nerve Injury Method: A Reliable Assay to Identify and Test Factors That Repair Neuromuscular Junctions
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DOK7 Promotes NMJ Regeneration After Nerve Injury.

Ethan D Kosco1, Hongyang Jing2, Peng Chen2

  • 1Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, 44106, USA.

Molecular Neurobiology
|December 4, 2022
PubMed
Summary
This summary is machine-generated.

Promoting neuromuscular junction (NMJ) regeneration is crucial for motor function recovery after injury. Increasing agrin signaling via DOK7 enhances NMJ repair, offering a potential therapeutic strategy.

Keywords:
Adeno-associated virus serotype 9DOK7Nerve injuryNeuromuscular junctionRegeneration

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Motor function recovery necessitates muscle fiber and neuromuscular junction (NMJ) regeneration.
  • NMJ regeneration mechanisms remain largely uncharacterized, unlike muscle regeneration.
  • Agrin-LRP4-MuSK signaling is vital for NMJ formation and maintenance.

Purpose of the Study:

  • To investigate if enhanced MuSK activity promotes NMJ regeneration.
  • To evaluate the therapeutic potential of DOK7, a MuSK stimulator, in NMJ regeneration.

Main Methods:

  • Adeno-associated virus serotype 9 (AAV9) vectors encoding DOK7 or GFP were used.
  • AAV9-DOK7-GFP was injected into muscles to increase MuSK activity.
  • Neuromuscular junction regeneration was assessed by evaluating reinnervation, acetylcholine receptor (AChR) cluster density, and endplate area.

Main Results:

  • Muscles injected with AAV9-DOK7-GFP showed improved reinnervation and increased AChR cluster density.
  • Endplate area was larger, and fragmentation was reduced in AAV9-DOK7-GFP treated muscles.
  • These findings indicate expedited NMJ regeneration with increased DOK7 expression.

Conclusions:

  • Increased DOK7 expression accelerates NMJ regeneration.
  • Enhancing agrin signaling benefits motor function recovery post-injury.
  • Promoting NMJ regeneration by boosting agrin signaling presents a novel therapeutic approach for muscle and nerve injuries.