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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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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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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
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Related Experiment Video

Updated: Aug 28, 2025

Characterization of Neuromuscular Junctions in Mice by Combined Confocal and Super-Resolution Microscopy
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Characterization of Neuromuscular Junctions in Mice by Combined Confocal and Super-Resolution Microscopy

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SMN controls neuromuscular junction integrity through U7 snRNP.

Sarah Tisdale1, Meaghan Van Alstyne1, Christian M Simon2

  • 1Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA; Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA; Department of Neurology, Columbia University, New York, NY 10032, USA.

Cell Reports
|September 21, 2022
PubMed
Summary

Spinal muscular atrophy (SMA) involves neuromuscular junction loss. Restoring U7 snRNP assembly, crucial for histone mRNA processing, rescues NMJ integrity and synaptic function in SMA mice.

Keywords:
3′-end mRNA processingCP: NeuroscienceLsm proteinsRNP assemblyU7 small nuclear ribonucleoprotein (snRNP)histone gene regulationmotor neuronsneurodegenerationneuromuscular junction (NMJ)spinal muscular atrophy (SMA)survival motor neuron (SMN)

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The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy
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The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy
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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • The neuromuscular junction (NMJ) is vital for motor function.
  • Loss of NMJ integrity is a hallmark of spinal muscular atrophy (SMA).
  • The SMN protein is critical for NMJ maintenance in SMA.

Purpose of the Study:

  • To investigate the role of SMN protein activity in U7 small nuclear ribonucleoprotein (snRNP) assembly.
  • To determine if U7 snRNP dysfunction contributes to SMA neuromuscular pathology.
  • To explore therapeutic potential of enhancing U7 snRNP function in SMA.

Main Methods:

  • Studied SMN protein's role in U7 snRNP assembly and histone mRNA processing.
  • Utilized co-expression of Lsm10 and Lsm11 to enhance U7 snRNP function in SMA mouse models.
  • Assessed NMJ structure, synaptic transmission, and muscle atrophy in treated SMA mice.
  • Investigated the impact of U7 snRNP dysfunction on Agrin expression at the NMJ.

Main Results:

  • SMN protein activity in U7 snRNP assembly is essential for NMJ integrity.
  • Enhancing U7 snRNP assembly corrected histone mRNA processing defects in SMA mice.
  • Restored U7 snRNP function rescued NMJ denervation, synaptic transmission deficits, and muscle atrophy in SMA mice.
  • U7 snRNP dysfunction led to selective loss of Agrin at NMJs in SMA mice.

Conclusions:

  • U7 snRNP dysfunction directly contributes to neuromuscular pathology in spinal muscular atrophy.
  • Histone gene regulation by U7 snRNP is crucial for maintaining motor neuron-muscle synaptic connections.
  • Targeting U7 snRNP assembly offers a potential therapeutic strategy for SMA.