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Dopamine and nicotine, but not serotonin, modulate the crustacean ventilatory pattern generator
1Department of Biological Sciences, University of Calgary, Canada.
Journal of Neurobiology
|August 1, 1992
Summary
Dopamine (DA) increases crab ventilation motor neuron burst frequency. Nicotine
Area of Science:
- Neuroscience
- Marine Biology
- Comparative Physiology
Background:
- The crab ventilatory pattern generator (CPGv) controls rhythmic motor output.
- Dopamine (DA) is a neurotransmitter with known modulatory effects on neural circuits.
Purpose of the Study:
- To investigate the role of dopamine and other neurotransmitters in regulating the CPGv rhythm.
- To elucidate the mechanisms underlying nicotine's effects on CPGv activity.
Main Methods:
- Deafferented crab CPGv preparations were used.
- The effects of dopamine, domperidone, serotonin, nicotine, and acetylcholine chloride were examined.
- Pharmacological agents including D2 and D1 dopamine antagonists were applied.
Main Results:
- Dopamine dose-dependently increased CPGv burst frequency (fR).
- Domperidone (D2 antagonist) depressed fR and blocked dopamine's effects.
- Nicotine exhibited a triphasic effect: initial reversal, depression, then excitation; its excitation was blocked by domperidone.
Conclusions:
- Dopaminergic pathways likely maintain the CPGv rhythm.
- Nicotine's acceleratory effects may involve dopamine release or atypical acetylcholine receptor stimulation.