Cited by 663Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeurotransmitter Receptor Influence on Behavior

Habenular α5 nicotinic receptor subunit signalling controls nicotine intake

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Fowler, Christie D., Lu, Qun, Johnson, Paul M., Marks, Michael J., Kenny, Paul J.·2011·Nature

Abstract

Genetic variation in CHRNA5, the gene encoding the α5 nicotinic acetylcholine receptor subunit, increases vulnerability to tobacco addiction and lung cancer, but the underlying mechanisms are unknown. Here we report markedly increased nicotine intake in mice with a null mutation in Chrna5. This effect was 'rescued' in knockout mice by re-expressing α5 subunits in the medial habenula (MHb), and recapitulated in rats through α5 subunit knockdown in MHb. Remarkably, α5 subunit knockdown in MHb did not alter the rewarding effects of nicotine but abolished the inhibitory effects of higher nicotine doses on brain reward systems. The MHb extends projections almost exclusively to the interpeduncular nucleus (IPN). We found diminished IPN activation in response to nicotine in α5 knockout mice. Further, disruption of IPN signalling increased nicotine intake in rats. Our findings indicate that nicotine activates the habenulo-interpeduncular pathway through α5-containing nAChRs, triggering an inhibitory motivational signal that acts to limit nicotine intake.

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Crossref · 10.1038/nature09797

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  • α5 knockout mice consumed more nicotine only when higher unit doses were available.

    “Interestingly, the knockout mice consumed more nicotine only when higher unit doses of the drug were available (Fowler et al. 2011).”

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

    In “α5* nAChRs control nicotine intake” (page unavailable), the paper reports that knockout mice consumed greater amounts as the unit dose increased and responded more vigorously especially at higher doses. It does not establish the claim’s stricter “only” condition: the passage says “especially,” not that increased consumption occurred exclusively at higher doses. (LLM, conf=0.86)

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  • Chemical inactivation of the MHb or IPN with lidocaine, or disruption of NMDA receptor-mediated glutamatergic transmission with LY2358959, increased nicotine self-administration in rats similarly to α5 knockout.

    “Chemical inactivation of the MHb or the IPN using the local anesthetic lidocaine, or disruption of N-methyl-D-aspartate (NMDA) receptor-mediated glutamatergic transmission in these sites using the competitive antagonist LY2358959, increased nicotine self-administration behavior in rats in a manner similar to the α5 nAChR subunit knockout mice (Fowler et al. 2011).”

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

    In “Habenular-IPN activity limits nicotine intake,” lidocaine inactivation of the IPN or MHb and NMDA-receptor antagonism at those sites increased nicotine self-administration in rats, consistent with the knockout findings reported elsewhere in the paper. The source names the antagonist LY235959, not LY2358959; it also reports the MHb effects only at a higher nicotine dose. Page numbers were not provided in the supplied passages. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • α5 nicotinic acetylcholine receptors in the habenula appear to modulate aversive responses to large doses of nicotine, and habenular α2 receptors along with α5 are involved in nicotine withdrawal.

    “This hypothesis is also consistent with the finding that α5 nicotinic acetylcholine receptors in the habenula appear to modulate aversive responses to large doses of nicotine48 and, along with habenular α2 receptors, nicotine withdrawal (tables 1, 2, circuit 9).”

    From Neurobiology of addiction: a neurocircuitry analysis (2016) · cites this paper as [48]

  • Mice with a null mutation in the α5 subunit intravenously self-administered far more nicotine than wild-type littermates.

    “Consistent with an important role for α5 Ã nAChRs in regulating nicotine intake, it was recently shown that mice with null mutation in this subunit intravenously self-administered far more nicotine than their wild-type littermates (Fowler et al. 2011).”

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

  • The MHb-IPN pathway of α5 knockout mice was far less sensitive to nicotine-induced activation than that of wild-type mice, as measured by Fos immunoreactivity.

    “By using Fos immunoreactivity as a measure of neuronal activation, it was shown that the MHb-IPN pathway of the knockout mice was far less sensitive to nicotine-induced activation than wild-type mice (Fowler et al. 2011).”

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

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Research works printed but not linked: 1

  1. [8]Jackson KJ Role of alpha5 nicotinic acetylcholine receptors in pharmacological and behavioral effects of nicotine in mice J Pharmacol Exp Ther 2010 334 137 146 20400469 PMC2912049

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Authors
Fowler, C. D., Lu, Q., Johnson, P. M., Marks, M. J., & Kenny, P. J.
Affiliations
  • Scripps Research Institute (US)
  • University of Colorado Boulder (US)
Corresponding author
Kenny, Paul J.
Venue
Nature
Published
2011-01-30
Volume
471
Issue
7340
Pages
597-601
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1996499810
Cited by
663
References
62
Citations by year
2026: 22 · 2025: 30 · 2024: 24 · 2023: 34 · 2022: 21 · 2021: 31 · 2020: 78 · 2019: 44 · 2018: 44 · 2017: 34 · 2016: 45 · 2015: 50 · 2014: 60 · 2013: 57 · 2012: 49
FWCI
26.98
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
National Institute on Drug Abuse (P30DA015663, F32DA026693, DA020686, R01DA020686, DA026693, R37DA020686)
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
CHRNA5, nicotine use, tobacco dependence, medial habenula, interpeduncular nucleus, nicotine reward, smoking cessation, lung cancer susceptibility
MeSH terms
Animals, Female, Male, Nicotine, Receptors, Nicotinic, Reward, Tobacco Use Disorder, Signal Transduction, Mice, Knockout, Habenula, Mice, Rats

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