Cited by 120Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeuroscience and Neuropharmacology Research

(S)-(−)-cotinine, the major brain metabolite of nicotine, stimulates nicotinic receptors to evoke [3H]dopamine release from rat striatal slices in a calcium-dependent manner

Dwoskin, Linda P., Teng, Lihong, Buxton, Susan T., Crooks, Peter A.·1999·The Journal of Pharmacology and Experimental Therapeutics

Abstract

Cotinine, a major peripheral metabolite of nicotine, has recently been shown to be the most abundant metabolite in rat brain after peripheral nicotine administration. However, little attention has been focused on the contribution of cotinine to the pharmacological effects of nicotine exposure in either animals or humans. The present study determined the concentration-response relationship for (S)-(-)-cotinine-evoked 3H overflow from superfused rat striatal slices preloaded with [3H]dopamine ([3H]DA) and whether this response was mediated by nicotinic receptor stimulation. (S)-(-)-Cotinine (1 microM to 3 mM) evoked 3H overflow from [3H]DA-preloaded rat striatal slices in a concentration-dependent manner with an EC50 value of 30 microM, indicating a lower potency than either (S)-(-)-nicotine or the active nicotine metabolite, (S)-(-)-nornicotine. As reported for (S)-(-)-nicotine and (S)-(-)-nornicotine, desensitization to the effect of (S)-(-)-cotinine was observed. The classic nicotinic receptor antagonists mecamylamine and dihydro-beta-erythroidine inhibited the response to (S)-(-)-cotinine (1-100 microM). Additionally, 3H overflow evoked by (S)-(-)-cotinine (10-1000 microM) was inhibited by superfusion with a low calcium buffer. Interestingly, over the same concentration range, (S)-(-)-cotinine did not inhibit [3H]DA uptake into striatal synaptosomes. These results demonstrate that (S)-(-)-cotinine, a constituent of tobacco products and the major metabolite of nicotine, stimulates nicotinic receptors to evoke the release of DA in a calcium-dependent manner from superfused rat striatal slices. Thus, (S)-(-)-cotinine likely contributes to the neuropharmacological effects of nicotine and tobacco use.

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Crossref · 10.1016/s0022-3565(24)38040-1

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68 of 68 references verified0 citation errors · 0 not checkable

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  • Both nicotine and cotinine have been shown to facilitate dopamine release.

    “both nicotine59 and cotinine60 have been shown to facilitate dopamine release”
  • Prolonged partial occupancy of the receptor by nicotine or cotinine may contribute to the feelings of craving reported 2 h after the last cigarette and throughout the first week of abstinence.

    “Dopamine release has been associated with the feeling of craving58, and both nicotine59 and cotinine60 have been shown to facilitate dopamine release, thus the prolonged partial occupancy of the receptor by nicotine or cotinine, may contribute to the feelings of craving that are reported 2 h after the last cigarette and throughout the first week of abstinence.”
  • Cotinine stimulates nAChRs and may have biological effects.

    “The rather high circulating plasma cotinine levels after nicotine ingestion, coupled with findings that cotinine stimulates nAChRs, has prompted the suggestion that cotinine per se may have biological effects (Dwoskin et al., 1999;O'Leary et al., 2008).”

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Authors
Dwoskin, L. P., Teng, L., Buxton, S. T., & Crooks, P. A.
Affiliations
University of Kentucky (US)
Corresponding author
Dwoskin, Linda P.
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
1999-03
Volume
288
Issue
3
Pages
905-911
ISSN
0022-3565 (ISSN-L)
OpenAlex
W1911378236
Cited by
120
References
73
Citations by year
2026: 3 · 2025: 2 · 2024: 5 · 2023: 4 · 2022: 2 · 2021: 6 · 2020: 12 · 2019: 4 · 2018: 4 · 2017: 6 · 2016: 6 · 2015: 10 · 2014: 10 · 2013: 2 · 2012: 6
FWCI
1.60
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed
Funders
  • National Institutes of Health (5r01da008656-03)
  • National Institute on Drug Abuse (DA-08656)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
cotinine, nicotine metabolites, nicotinic acetylcholine receptors, dopamine release, striatum, calcium dependence, receptor desensitization, mecamylamine, dihydro-beta-erythroidine, dopamine uptake, tobacco use
MeSH terms
Animals, Calcium, Corpus Striatum, Cotinine, Dopamine, Male, Nicotine, Receptors, Nicotinic, Synaptosomes, Tritium, Rats, Sprague-Dawley, Nicotinic Agonists, Nicotinic Antagonists, Rats, In Vitro Techniques

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