Cited by 285Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchNeurotransmitter Receptor Influence on Behavior

Nicotinic excitation of rat ventral tegmental neurones in vitro studied by intracellular recording

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Calabresi, P., Lacey, M.G., North, R.A.·1989·British Journal of Pharmacology

Abstract

1. Intracellular recordings were made from presumed dopamine-containing neurones in the ventral tegmental area (VTA) in rat brain slices. 2. Nicotine (10-100 microM) and acetylcholine (ACh) depolarized the neurones. The depolarization caused by ACh was typically biphasic; both components were increased by neostigmine (0.1-10 microM), but only the slower component was blocked by scopolamine (1-10 microM). 3. The nicotinic action of ACh, studied in the presence of neostigmine and scopolamine, persisted in the presence of tetrodotoxin (1 microM) and cobalt (2-5 mM). 4. ACh or carbachol (30 microM) caused inward currents in neurones voltage-clamped near the resting potential. These currents reversed polarity at around -4 mV, were blocked by hexamethonium (1-100 microM) in a voltage-dependent manner, and showed desensitization with prolonged or repeated agonist applications. 5. Depolarizations caused by ACh and carbachol were reduced in slices pretreated with kappa-bungarotoxin, but were not changed by alpha-bungarotoxin. 6. These responses to ACh and nicotine resemble those previously described on autonomic ganglion cells. The direct action on VTA neurones may contribute to the positive reinforcement associated with nicotine consumption.

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Crossref · 10.1111/j.1476-5381.1989.tb16873.x

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  1. Smith, J.E. & Lane, J.D. pp. 331-359. Amsterdam: Elsevier.

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Authors
Calabresi, P., Lacey, M. G., & North, R. A.
Affiliations
Oregon Health & Science University (US)
Corresponding author
North, R.A.
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
1989-09
Volume
98
Issue
1
Pages
135-140
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W2074102542
Cited by
285
References
36
Citations by year
2025: 1 · 2024: 2 · 2022: 1 · 2021: 7 · 2020: 3 · 2018: 8 · 2017: 4 · 2016: 5 · 2015: 3 · 2014: 10 · 2013: 7 · 2012: 6
FWCI
3.87
Type
journal article
Language
en
Open access
Locations
  • British Journal of Pharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Health and Human Services
  • National Institute of Mental Health (MH 40416)
  • National Institute on Drug Abuse (DA03161)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
nicotinic acetylcholine receptors, ventral tegmental area, dopaminergic neurons, acetylcholine, nicotine, neostigmine, scopolamine, tetrodotoxin, cobalt, carbachol, inward current, hexamethonium, desensitization, bungarotoxin, positive reinforcement, nicotine use
MeSH terms
Acetylcholine, Animals, Bungarotoxins, Carbachol, Electrophysiology, Hexamethonium Compounds, Male, Membrane Potentials, Neurons, Nicotine, Receptors, Nicotinic, Tegmentum Mesencephali, Rats, In Vitro Techniques

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