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Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
Published on: December 5, 2012
Retrograde determination of motoneuron properties and their synaptic input
L M Mendell1, W F Collins, J B Munson
1Department of Neurobiology and Behavior, State University of New York at Stony Brook 11794.
Journal of Neurobiology
|June 1, 1994
Summary
Motor neurons and muscle fibers interact to achieve coordinated properties, with evidence suggesting both muscle-to-neuron (retrograde) and neuron-to-muscle (orthograde) signaling pathways influence their development.
Area of Science:
- Neuroscience
- Muscle Physiology
- Cell Biology
Background:
- Motoneurons and muscle fibers exhibit correlated properties, suggesting coordinated development.
- The mechanisms and directionality of this interaction remain incompletely understood.
Purpose of the Study:
- To investigate the directionality of interactions between motoneurons and muscle fibers.
- To explore the roles of orthograde and retrograde signaling in specifying neuronal and muscular properties.
- To examine the influence of muscle-derived factors on motoneuron specification.
Main Methods:
- Analysis of correlated properties between motoneurons and muscle fibers.
- Experiments involving muscle reinnervation with original or foreign motor nerves.
- Investigation of neurotrophin involvement in retrograde signaling.
Main Results:
- Correlated properties suggest non-independent specification of motoneurons and muscle fibers.
- Evidence supports both orthograde and retrograde signaling, with a notable role for retrogradely transported muscle factors.
- Synaptic input to motoneurons also shows coordinated variation, implying retrograde determination from muscle.
- Peripheral nerve manipulations disrupt the coordination between motoneuron properties and synaptic input, indicating independent specification mechanisms.
Conclusions:
- Muscle-derived factors play a significant role in specifying motoneuron properties via retrograde transport.
- While muscle influences motoneuron synaptic input, this process exhibits some independence from motoneuron property specification.
- The findings highlight a complex interplay of signaling pathways in achieving neuromuscular coherence.
