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Related Concept Videos

The Neuromuscular Junction01:19

The Neuromuscular Junction

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...
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

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...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle Contraction01:15

Muscle Contraction

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Updated: May 7, 2026

Engineering and Characterization of an Optogenetic Model of the Human Neuromuscular Junction
11:07

Engineering and Characterization of an Optogenetic Model of the Human Neuromuscular Junction

Published on: April 14, 2022

Three-dimensional neuron-muscle constructs with neuromuscular junctions.

Yuya Morimoto1, Midori Kato-Negishi, Hiroaki Onoe

  • 1Center for International Research on Micronano Mechatronics (CIRMM), Institute of Industrial Science (IIS), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.

Biomaterials
|September 18, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to create functional muscle tissue constructs. These constructs, co-cultured with motor neurons, successfully formed neuromuscular junctions (NMJs) enabling controlled muscle contractions.

Keywords:
Co-cultureMuscleNerve tissue engineeringNeural cell

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Visualizing the Morphological Characteristics of Neuromuscular Junction in Rat Medial Gastrocnemius Muscle
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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Tissue Engineering

Background:

  • Developing functional engineered tissues requires precise control over cell-cell interactions.
  • Motor neurons are crucial for skeletal muscle function, mediating contraction via neuromuscular junctions (NMJs).
  • Existing models often lack the complexity to replicate in vivo neuromuscular signaling.

Purpose of the Study:

  • To fabricate three-dimensional (3D) muscle tissue constructs co-cultured with motor neurons.
  • To establish functional neuromuscular junctions (NMJs) within these engineered constructs.
  • To evaluate the contractile response of the muscle constructs upon neuronal activation.

Main Methods:

  • Differentiated mouse neural stem cells (mNSCs) into motor neurons on pre-existing skeletal muscle fibers.
  • Co-cultured neurons and muscle fibers to promote neurite outgrowth and synapse formation.
  • Utilized acetylcholine receptor (AChR) formation as an indicator of NMJ development.
  • Stimulated neuronal activation with glutamic acid and assessed muscle contraction.
  • Used curare, an NMJ antagonist, to confirm the role of NMJs in observed contractions.

Main Results:

  • Successfully created 3D free-standing skeletal muscle fibers co-cultured with motor neurons.
  • Demonstrated the formation of functional neuromuscular junctions (NMJs) with acetylcholine receptors (AChRs) at the neuron-muscle interface.
  • Observed directed muscle fiber contractions upon glutamic acid-induced neuronal activation.
  • Confirmed that curare treatment inhibited the muscle contractions, validating NMJ functionality.

Conclusions:

  • The developed fabrication method successfully generates functional neuron-muscle constructs with integrated NMJs.
  • These constructs exhibit controlled, directed contractions mediated by neuronal signaling.
  • The neuron-muscle construct system holds potential for applications in neuromuscular disease research and soft robotics.