Related Experiment Videos
Cell types required to efficiently innervate human muscle cells in vitro
S Guettier-Sigrist1, G Coupin, J M Warter
1Laboratoire de Pathologie des Communications entre Cellules Nerveuses et Musculaires (UPRES 2308), Clinique Neurologique 2, UFR des Sciences Médicales, Université Louis Pasteur, 74 route du Rhin, Illkirch Cedex, 67401, France.
Experimental Cell Research
|August 16, 2000
Summary
Spinal muscular atrophy (SMA) muscle cells cause nerve and muscle degeneration. A simplified nerve-muscle coculture model requires motoneurons, sensory neurons, and Schwann cells for functional neuromuscular junctions, aiding SMA research.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Previous studies identified SMA muscle cells as responsible for myofiber degeneration in innervated cocultures.
- Understanding the specific nerve cell requirements for innervation is crucial for studying neuromuscular diseases.
Purpose of the Study:
- To simplify the nervous component in nerve-muscle cocultures to identify essential nerve cell types for successful innervation.
- To investigate the kinetics of nerve and muscle cell degeneration in the context of SMA.
Main Methods:
- Utilized a reconstituted nerve-muscle coculture system with cloned muscle satellite cells, fibroblasts, motoneurons, sensory neurons, and Schwann cells.
- Assessed functional neuromuscular junction formation through myotube contraction.
- Investigated the role of conditioned media from nerve cells on innervation.
Main Results:
- Motoneurons alone could not innervate myotubes.
- A combination of motoneurons, sensory neurons, and Schwann cells was necessary for functional neuromuscular junction formation.
- Schwann cells could be replaced by conditioned medium, suggesting a soluble innervation-promoting factor.
Conclusions:
- Successful innervation requires motoneurons, sensory neurons, and myotubes to have physical contact.
- Schwann cells contribute a soluble factor that promotes innervation.
- This reconstituted system facilitates the study of neuromuscular disease pathogenesis, particularly spinal muscular atrophy.