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Octopamine boosts snail locomotion: behavioural and cellular analysis.
Jennifer C Ormshaw1, Christopher J H Elliott
1Department of Biology, University of York, P.O. Box 373, York , YO10 5YW, UK.
Invertebrate Neuroscience : IN
|October 31, 2006
Summary
Octopamine antagonists epinastine and phentolamine significantly reduced pond snail locomotion. This suggests octopamine plays a role in modulating snail movement, potentially via pedal motoneurons.
Area of Science:
- Neuroscience
- Animal Behavior
- Pharmacology
Background:
- Octopamine is a biogenic amine found in invertebrates.
- Its role in regulating physiological processes, including locomotion, is under investigation.
- Understanding octopamine's function can provide insights into invertebrate neurobiology.
Purpose of the Study:
- To investigate the effect of octopamine antagonists on the locomotion of the pond snail, Lymnaea stagnalis.
- To determine if octopamine modulates snail locomotion through effects on specific motoneurons.
Main Methods:
- Transdermal application of epinastine and phentolamine to unrestrained Lymnaea stagnalis.
- Measurement of snail speed and locomotion reduction.
- Electrophysiological recording of pedal A cluster motoneuron firing rates in isolated central nervous system (CNS).
Main Results:
- Epinastine and phentolamine significantly reduced snail locomotion speed.
- Locomotion reduction was dose-dependent.
- Octopamine application increased the firing rate of pedal A cluster motoneurons, which control ciliary locomotion.
Conclusions:
- Octopamine is likely involved in modulating snail locomotion.
- These effects may be mediated, in part, by octopamine's action on pedal motoneurons.
- This study highlights the importance of octopamine in invertebrate motor control.
