Possible pathogenic role of muscle cell dysfunction in motor neuron death in spinal muscular atrophy
Identifieur interne : 003353 ( Main/Exploration ); précédent : 003352; suivant : 003354Possible pathogenic role of muscle cell dysfunction in motor neuron death in spinal muscular atrophy
Auteurs : Séverine Guettier-Sigrist [France] ; Bénédicte Hugel [France] ; Gilliane Coupin [France] ; Jean-Marie Freyssinet [France] ; Philippe Poindron [France] ; Jean-Marie Warter [France]Source :
- Muscle & Nerve [ 0148-639X ] ; 2002-05.
English descriptors
Abstract
We have previously shown that myofibers formed by fusion of muscle satellite cells from spinal muscular atrophy (SMA) I or II undergo degeneration 1 to 3 weeks after innervation by rat embryonic spinal cord explants, whereas normal myofibers survive for several months. In the “muscle component” of the coculture, the only cells responsible for the degeneration are the SMA muscle satellite cells. Moreover, SMA muscle satellite cells do not fuse as rapidly as do normal muscle satellite cells. To determine whether death of muscle cells precedes that of motor neurons, we studied the origin and kinetics of release of apoptotic microparticles. In SMA cocultures, motor neuron apoptosis occurred before myofiber degeneration becomes visible, indicating that SMA myofibers were unable to sustain survival of motor neurons. In normal cocultures, motor neuron apoptosis occurred 4 days after innervation. However, it did not continue beyond 2 days. These results strengthen the hypothesis that SMA is due to a defect in neurotrophic muscle cell function. © 2002 Wiley Periodicals, Inc. Muscle Nerve 25: 000–000, 2002
Url:
DOI: 10.1002/mus.10081
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">We have previously shown that myofibers formed by fusion of muscle satellite cells from spinal muscular atrophy (SMA) I or II undergo degeneration 1 to 3 weeks after innervation by rat embryonic spinal cord explants, whereas normal myofibers survive for several months. In the “muscle component” of the coculture, the only cells responsible for the degeneration are the SMA muscle satellite cells. Moreover, SMA muscle satellite cells do not fuse as rapidly as do normal muscle satellite cells. To determine whether death of muscle cells precedes that of motor neurons, we studied the origin and kinetics of release of apoptotic microparticles. In SMA cocultures, motor neuron apoptosis occurred before myofiber degeneration becomes visible, indicating that SMA myofibers were unable to sustain survival of motor neurons. In normal cocultures, motor neuron apoptosis occurred 4 days after innervation. However, it did not continue beyond 2 days. These results strengthen the hypothesis that SMA is due to a defect in neurotrophic muscle cell function. © 2002 Wiley Periodicals, Inc. Muscle Nerve 25: 000–000, 2002</div>
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