Cited by 45Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeuroscience and Neuropharmacology Research

Cotinine selectively activates a subpopulation of α3/α6β2* nicotinic receptors in monkey striatum

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O’Leary, Kathryn, Parameswaran, Neeraja, McIntosh, J. Michael, Quik, Maryka·2008·The Journal of Pharmacology and Experimental Therapeutics

Abstract

The nicotine metabolite cotinine is an abundant long-lived bio-active compound that may contribute to the overall physiological effects of tobacco use. Although its mechanism of action in the central nervous system has not been extensively investigated, cotinine is known to evoke dopamine release in the nigrostriatal pathway through an interaction at nicotinic receptors (nAChRs). Because considerable evidence now demonstrates the presence of multiple nAChRs in the striatum, the present experiments were done to determine the subtypes through which cotinine exerts its effects in monkeys, a species that expresses similar densities of striatal alpha4beta2* (nAChR containing the alpha4 and beta2 subunits, but not alpha3 or alpha6) and alpha3/alpha6beta2* (nAChR composed of the alpha3 or alpha6 subunits and beta2) nAChRs. Competition binding studies showed that cotinine interacts with both alpha4beta2* and alpha3/alpha6beta2* nAChR subtypes in the caudate, with cotinine IC(50) values for inhibition of 5-[(125) I]iodo-3-[2(S)-azetinylmethoxy]pyridine-2HCl ([(125)I]A-85380) and (125)I-alpha-conotoxinMII binding in the micromolar range. This interaction at the receptor level is of functional significance because cotinine stimulated both alpha4beta2* and alpha3/alpha6beta2* nAChR [(3)H]dopamine release from caudate synaptosomes. Our results unexpectedly showed that nicotine evokes [(3)H]dopamine release from two alpha3/alpha6beta2* nAChR populations, one of which was sensitive to cotinine and the other was not. This cotinine-insensitive subtype was only present in the medial caudate and was preferentially lost with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced nigrostriatal damage. In contrast, cotinine and nicotine elicited equivalent levels of alpha4beta2* nAChR-mediated dopamine release. These data demonstrate that cotinine functionally discriminates between two alpha3/alpha6beta2* nAChRs in monkey striatum, with the cotinine-insensitive alpha3/alpha6beta2* nAChR preferentially vulnerable to nigrostriatal damage.

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Authors
O’Leary, K., Parameswaran, N., McIntosh, J. M., & Quik, M.
Affiliations
Parkinson's Institute and Clinical Center (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
2008-05
Volume
325
Issue
2
Pages
646-654
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2103153047
Cited by
45
References
49
Citations by year
2024: 1 · 2023: 2 · 2022: 1 · 2021: 2 · 2020: 4 · 2019: 2 · 2018: 3 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 4 · 2013: 4 · 2012: 5
FWCI
1.51
Type
journal article
Language
en
Open access
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Johns Hopkins University
  • National Institute of Mental Health (MH53631, R01MH053631, R29MH053631)
  • National Institute on Drug Abuse (R01DA012242, DA12242)
  • National Institute of General Medical Sciences (P01GM048677)
  • National Institute of Neurological Disorders and Stroke (R01NS047162, NS42091, NS47162, R01NS042091)
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, nicotinic acetylcholine receptors, alpha4beta2 nAChR, striatum, caudate nucleus, dopamine release, nigrostriatal pathway, MPTP, receptor subtypes
MeSH terms
Animals, Azetidines, Brain, Cocaine, Cotinine, Dopamine, Female, Nicotine, Receptors, Nicotinic, Saimiri, Dopamine Agents, 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine, Nicotinic Agonists, Nicotinic Antagonists, Conotoxins

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