Cited by 72Nicotinic Acetylcholine Receptors StudyMemory and Neural MechanismsSmoking Behavior and Cessation

β2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice

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Davis, Jennifer A., Gould, Thomas J.·2007·Psychopharmacology

Abstract

Rationale Previous research indicates that acute nicotine administration enhances the acquisition of contextual fear conditioning and trace cued fear conditioning. Pharmacological inhibition of alpha4beta2 nicotinic acetylcholine receptors (nAChRs), but not alpha7 nAChRs, blocked the enhancing effect of nicotine on contextual fear conditioning. Similarly, genetic deletion of the beta2 nAChR subunit but not the alpha7 nAChR subunit blocked the enhancing effect of nicotine on contextual fear conditioning.Objectives In the present study, nAChR subunit knockout mice were used to compare the involvement of beta2 subunit-containing nAChRs and alpha7 subunit-containing nAChRs in the effects of nicotine on hippocampus-dependent trace cued fear conditioning and contextual fear conditioning.Methods beta2 nAChR subunit knockout mice, alpha7 nAChR subunit knockout mice, and their wild-type littermates received either nicotine or saline 5 minutes before training and testing. Mice were trained using five conditioned stimulus (CS; 30 s, 85 dB white noise)--trace (30 s)--unconditioned stimulus (US; 2 s footshock) pairings. Freezing to the context and freezing to the CS were assessed 24 h later.Results Both contextual and trace cued fear conditioning were enhanced by nicotine administration in wild-type littermates and in alpha7 nAChR subunit knockout mice. In contrast, neither contextual fear conditioning nor trace cued fear conditioning was enhanced by nicotine administration in beta2 nAChR subunit knockout mice.Conclusions These results suggest that beta2 subunit-containing nAChRs but not alpha7 nAChR subunit-containing nAChRs are critically involved in the enhancing effect of nicotine on contextual and trace cued fear conditioning.

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  • The enhancement of fear conditioning by nicotine requires β2-containing but not α7-containing nAChRs.

    “This enhancement by nicotine requires β2-containing but not α7-containing nAChRs [199].”

    From Mechanistic insights into nicotine withdrawal (2011) · cites this paper as [199]

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  1. Ramirez-Latorre J, Crabtree G, Turner J, Role L (1998) Molecular compositions and biophysical characteristics of nicotinic receptors. In: Arneric SP, Brioni JD (eds) Neuronal nicotinic receptors: pharmacology and therapeutic opportunities. Wiley, New York, pp 43–64

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Authors
Davis, J. A., & Gould, T. J.
Affiliations
Temple University (US)
Corresponding author
Gould, Thomas J.
Venue
Psychopharmacology
Published
2006-11-30
Volume
190
Issue
3
Pages
343-352
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W2072227438
Cited by
72
References
69
Citations by year
2025: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2020: 2 · 2018: 2 · 2017: 4 · 2016: 6 · 2015: 7 · 2014: 2 · 2013: 9 · 2012: 9
FWCI
2.45
Type
journal article
Language
en
Open access
Locations
  • Psychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Drug Abuse (DA017949, R01DA017949, T32DA007237)
  • National Cancer Institute
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
Keywords
nicotine, nicotinic acetylcholine receptors, beta2 subunit, alpha7 subunit, contextual fear conditioning, hippocampal-dependent memory
MeSH terms
Acoustic Stimulation, Analysis of Variance, Animals, Conditioning, Classical, Conditioning, Operant, Cues, Dose-Response Relationship, Drug, Fear, Female, Genotype, Heterozygote, Hippocampus, Male, Mice, Inbred C57BL, Nicotine, Receptors, Nicotinic, Time Factors, Mice, Knockout, Mice, alpha7 Nicotinic Acetylcholine Receptor

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