Cited by 165Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeurotransmitter Receptor Influence on Behavior

4 2 Nicotinic Acetylcholine Receptors on Dopaminergic Neurons Mediate Nicotine Reward and Anxiety Relief

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McGranahan, T. M., Patzlaff, N. E., Grady, S. R., Heinemann, S. F., Booker, T. K.·2011·Journal of Neuroscience

Abstract

Nicotine is the primary psychoactive substance in tobacco, and it exerts its effects by interaction with various subtypes of nicotinic acetylcholine receptors (nAChRs) in the brain. One of the major subtypes expressed in brain, the α4β2-nAChR, endogenously modulates neuronal excitability and thereby, modifies certain normal as well as nicotine-induced behaviors. Although α4-containing nAChRs are widely expressed across the brain, a major focus has been on their roles within midbrain dopaminergic regions involved in drug addiction, mental illness, and movement control in humans. We developed a unique model system to examine the role of α4-nAChRs within dopaminergic neurons by a targeted genetic deletion of the α4 subunit from dopaminergic neurons in mice. The loss α4 mRNA and α4β2-nAChRs from dopaminergic neurons was confirmed, as well as selective loss of α4β2-nAChR function from dopaminergic but not GABAergic neurons. Two behaviors central to nicotine dependence, reward and anxiety relief, were examined. α4-nAChRs specifically on dopaminergic neurons were demonstrated to be necessary for nicotine reward as measured by nicotine place preference, but not for another drug of addiction, cocaine. α4-nAChRs are necessary for the anxiolytic effects of nicotine in the elevated plus maze, and elimination of α4β2-nAChRs specifically from dopaminergic neurons decreased sensitivity to the anxiolytic effects of nicotine. Deletion of α4-nAChRs specifically from dopaminergic neurons also increased sensitivity to nicotine-induced locomotor depression; however, nicotine-induced hypothermia was unaffected. This is the first work to develop a dopaminergic specific deletion of a nAChR subunit and examine resulting changes in nicotine-related behaviors.

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Crossref · 10.1523/jneurosci.0937-11.2011

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  • Knockout of the α4 subunit abolishes intracerebroventricular self-administration of nicotine.

    “Similarly, knockout of the α4 subunit abolishes intracerebroventricular (i.c.v.) selfadministration of nicotine, consistent with evidence that α4/β2 Ã nAChRs are required for depolarization of DA neurons in the VTA (Exley et al. 2011;McGranahan et al. 2011).”

    From Mechanisms of Nicotine Addiction (2021) · cites this paper as McGranahan et al. 2011

    The Results section, “α4*-nAChRs on Dopaminergic Neurons Mediate Nicotine Reward” (page unavailable), reports that α4-knockout mice did not develop nicotine conditioned place preference. The Methods section, “Conditioned Place Preference” (page unavailable), describes intraperitoneal nicotine injections, not intracerebroventricular self-administration. The paper supports a loss of nicotine reward in this test, but not the specified self-administration claim. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • In mice with constitutive α6 knockout, intra-VTA self-administration of nicotine is not disrupted, whereas α4* nAChRs are necessary and sufficient for intra-VTA self-administration and nicotine-induced increases in DA neuron firing.

    “In contrast, in mice with constitutive knockout of the α6 subunit, intra-VTA selfadministration of nicotine is not disrupted, whereas α4 Ã nAChRs are necessaryand sufficient for both intra-VTA self-administration, as well as nicotine-induced increases in firing of DA neurons (Exley et al. 2011;McGranahan et al. 2011).”

    From Mechanisms of Nicotine Addiction (2021) · cites this paper as McGranahan et al. 2011

    The Results section, “α4*-nAChRs on Dopaminergic Neurons Mediate Nicotine Reward” (page unavailable), shows that deleting α4 from dopamine neurons abolished nicotine conditioned place preference, supporting a role for α4* receptors in nicotine reward. The Discussion, “Nicotine CPP is Mediated by Dopaminergic α4*-nAChRs” (page unavailable), reports that nicotine-stimulated dopamine-neuron burst firing requires α4β2* receptors. This paper does not establish the stated findings about α6-knockout mice, intra-VTA nicotine self-administration, or sufficiency of α4* receptors for self-administration and increased firing. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The addictive effects of nicotine are mediated primarily through stimulation of nicotinic acetylcholine receptors in the VTA.

    “particularly because the addictive effects of nicotine are mediated primarily through stimulation of nAChRs in the VTA (Drenan et al., 2008; Maskos et al., 2005; McGranahan et al., 2011; Picciotto et al., 1998).”
  • Mice lacking β2* nAChRs in dopamine neurons of the VTA lack anxiolytic responses to nicotine and are insensitive to nicotine reward.

    “mice lacking β2* nAChRs in dopamine neurons of the VTA lack anxiolytic responses to nicotine and are insensitive to nicotine reward (McGranahan et al., 2011)”
  • Nicotine reinforcement and reward is mediated through nAChRs in the mesolimbic system.

    “Nicotine reinforcement and reward is mediated through nAChRs in the mesolimbic system (Maskos et al., 2005; McGranahan et al., 2011; Tolu et al., 2012)”

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Authors
McGranahan, T. M., Patzlaff, N. E., Grady, S. R., Heinemann, S. F., & Booker, T. K.
Affiliations
  • Salk Institute for Biological Studies (US)
  • University of Colorado Boulder (US)
Venue
Journal of Neuroscience
Published
2011-07-27
Volume
31
Issue
30
Pages
10891-10902
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1973295491
Cited by
165
References
60
Citations by year
2026: 9 · 2025: 10 · 2024: 20 · 2023: 12 · 2022: 4 · 2021: 9 · 2020: 12 · 2019: 5 · 2018: 3 · 2017: 9 · 2016: 10 · 2015: 17 · 2014: 14 · 2013: 21 · 2012: 9
FWCI
5.85
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Alcohol Abuse and Alcoholism (AA13018, R01AA013018)
  • National Institute on Drug Abuse (DA018247, R01DA018247, DA012242, R01DA003194, DA003194, R01DA012242)
  • National Institute of Neurological Disorders and Stroke (NS10830, F32NS010830)
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 › Neurotransmitter Receptor Influence on Behavior
Keywords
nicotinic acetylcholine receptors, alpha4beta2 nAChR, dopaminergic neurons, nicotine reward, nicotine dependence, midbrain dopaminergic system, cocaine reward
MeSH terms
Analysis of Variance, Animals, Anxiety, Behavior, Animal, Body Temperature, Conditioning, Operant, Disease Models, Animal, Dopamine, Female, gamma-Aminobutyric Acid, Glutamate Decarboxylase, Male, Mesencephalon, Mice, Inbred C57BL, Neurons, Nicotine, Protein Binding, Pyridines, Receptors, Nicotinic, Reward, Synaptosomes, Tritium, Mice, Knockout, Nicotinic Agonists, Bridged Bicyclo Compounds, Heterocyclic, Dopamine Plasma Membrane Transport Proteins, Mice

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