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Developmental regulation of subtype-specific motor neuron excitability
Rosa L Moreno1, Angeles B Ribera
1Department of Physiology and Biophysics, University of Colorado at the Anschutz Medical Center, Aurora, Colorado, USA. rosa.moreno@ucdenver.edu
Annals of the New York Academy of Sciences
|June 12, 2010
Summary
Zebrafish primary motor neuron (PMN) subtypes exhibit distinct electrical properties during early development. These differences influence axonal development and may impact later motor neuron maturation, with Nav1.6 sodium channels playing a key role.
Area of Science:
- Neuroscience
- Developmental Biology
- Electrophysiology
Background:
- Zebrafish embryos offer a model for studying early spinal neuron development.
- Primary motor neuron (PMN) subtypes are identifiable and accessible for physiological studies.
- Electrophysiological differences in PMN subtypes may regulate activity-dependent development.
Purpose of the Study:
- To review findings on the development of electrical properties in zebrafish PMN subtypes.
- To explore the potential cell nonautonomous roles of PMN electrical activity.
- To discuss the involvement of Nav1.6 sodium channels in axonal development.
Main Methods:
- Electrophysiological recordings in zebrafish embryos.
- Analysis of axonal outgrowth and pathfinding.
- Investigation of sodium channel isoform expression and function.
Main Results:
- Zebrafish PMN subtypes display unique electrical properties during critical developmental periods.
- Differences in electrical properties correlate with axonal extension and target innervation.
- Specific sodium channel isoforms, like Nav1.6, are implicated in subtype-specific axonal guidance.
Conclusions:
- Early electrical properties of zebrafish PMN subtypes are crucial for subtype-specific axonal development.
- PMN electrical activity may influence the development of subsequent motor neuron populations.
- Nav1.6 channels are important mediators of activity-dependent axonal outgrowth and pathfinding in specific spinal neuron subtypes.
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