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Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
Published on: October 29, 2012
Heteromeric nicotinic acetylcholine-dopamine autoreceptor complexes modulate striatal dopamine release
Davide Quarta1, Francisco Ciruela, Kshitij Patkar
1Behavioral Neuroscience Branch, National Institute on Drug Abuse, IRP, NIH, DHHS, Baltimore, MD 21224, USA.
Dopamine D(2) autoreceptors and nicotinic acetylcholine (nACh) receptors interact on nerve terminals. These receptors form complexes that modulate dopamine release in the striatum, revealing crosstalk between receptor types.
Area of Science:
- Neuroscience
- Neuropharmacology
Background:
- Dopamine and acetylcholine (ACh) regulate dopamine release in the striatum via D(2) autoreceptors and nicotinic ACh (nACh) heteroreceptors on nerve terminals.
- Investigating functional interactions between these receptors is crucial for understanding striatal dopamine modulation.
Purpose of the Study:
- To investigate the functional interactions between striatal dopamine D(2) autoreceptors and nACh receptors.
- To elucidate the role of these interactions in modulating dopamine release.
Main Methods:
- In vivo microdialysis in freely moving rats to measure extracellular dopamine levels.
- Local perfusion of various agents including nicotine, receptor antagonists, and agonists.
- Co-immunoprecipitation experiments to assess physical interactions between receptor subunits.
Main Results:
- Nicotine perfusion increased extracellular dopamine, an effect blocked by nACh receptor antagonists and D(2) agonists.
- D(2) receptor antagonist perfusion also increased dopamine, partially counteracted by nACh antagonists.
- Demonstrated physical interactions between non-alpha(7) nACh receptor beta(2) subunits and D(2) autoreceptors.
Conclusions:
- Striatal D(2) autoreceptors modulate the efficacy of non-alpha(7) nACh receptor-mediated dopamine release.
- Non-alpha(7) nACh receptors form heteromeric complexes with D(2) autoreceptors, influencing dopamine release.
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