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Analysis of Embryonic and Larval Zebrafish Skeletal Myofibers from Dissociated Preparations
Published on: November 13, 2013
Uncoupling nicotine mediated motoneuron axonal pathfinding errors and muscle degeneration in zebrafish
Lillian Welsh1, Robert L Tanguay, Kurt R Svoboda
1Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Toxicology and Applied Pharmacology
|August 13, 2008
Summary
Nicotine exposure disrupts zebrafish neuromuscular development, affecting both spinal motoneurons and skeletal muscle. However, motoneuron axon pathfinding errors persist even without muscle defects, indicating a direct neurotoxic effect.
Area of Science:
- Developmental biology
- Neuroscience
- Toxicology
Background:
- Nicotine exposure in zebrafish embryos impacts neuromuscular system development.
- Previous studies showed delayed spinal motoneuron development and axonal pathfinding errors.
- The role of skeletal muscle development in these errors was not previously investigated.
Purpose of the Study:
- To investigate the impact of nicotine on skeletal muscle development in zebrafish embryos.
- To determine if altered muscle development contributes to motoneuron axon pathfinding errors.
- To elucidate the direct effects of nicotine on nervous system development.
Main Methods:
- Exposure of zebrafish embryos to nicotine.
- Analysis of skeletal muscle development and spinal motoneuron axon pathfinding.
- Utilizing the zebrafish mutant (sofa potato, [sop]) lacking muscle-specific AChRs.
Main Results:
- Nicotine exposure alters skeletal muscle development via binding to muscle-specific AChRs.
- Skeletal muscle development is unaffected by nicotine in [sop] mutants.
- Motoneuron axon pathfinding errors still occur in [sop] mutants despite normal muscle development.
Conclusions:
- Nicotine directly affects nervous system development, independent of skeletal muscle alterations.
- Nicotine-induced neuromuscular deficits result from both direct neurotoxicity and secondary muscle effects.
