Cited by 88Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchSmoking Behavior and Cessation

Nicotinic α5 subunit deletion locally reduces high‐affinity agonist activation without altering nicotinic receptor numbers

Brown, Robert W. B., Collins, Allan C., Lindstrom, Jon M., Whiteaker, Paul·2007·Journal of Neurochemistry

Abstract

Neuronal nicotinic acetylcholine receptor subunit α5 mRNA is widely expressed in the CNS. An α5 gene polymorphism has been implicated in behavioral differences between mouse strains, and α5‐null mutation induces profound changes in mouse acute responses to nicotine. In this study, we have examined the distribution and prevalence of α5* nicotinic acetylcholine receptor in mouse brain, and quantified the effects of α5‐null mutation on pre‐synaptic nicotinic acetylcholine receptor function (measured using synaptosomal 86 Rb+efflux) and overall [125 I]epibatidine binding site expression. α5* nicotinic acetylcholine receptor expression was found in nine of fifteen regions examined, although < 20% of the total nicotinic acetylcholine receptor population in any region contained α5. Deletion of the α5 subunit gene resulted in localized loss of function (thalamus, striatum), which was itself confined to the DHβE‐sensitive receptor population. No changes in receptor expression were seen. Consequently, functional changes must occur as a result of altered function per unit of receptor. The selective depletion of high agonist activation affinity sites results in overall nicotinic function being reduced, and increases the overall agonist activation affinity. Together, these results describe the receptor‐level changes underlying altered behavioral responses to nicotine in nicotinic acetylcholine receptor α5 subunit‐null mutants.

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Crossref · 10.1111/j.1471-4159.2007.04700.x

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Authors
Brown, R. W. B., Collins, A. C., Lindstrom, J. M., & Whiteaker, P.
Affiliations
  • University of Colorado Boulder (US)
  • University of Pennsylvania (US)
Corresponding author
Whiteaker, Paul
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
2007-05-21
Volume
103
Issue
1
Pages
204-215
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W2062770122
Cited by
88
References
51
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 3 · 2021: 2 · 2020: 8 · 2019: 5 · 2018: 1 · 2017: 1 · 2016: 4 · 2015: 6 · 2014: 6 · 2013: 6 · 2012: 4
FWCI
3.57
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Drug Abuse (R21DA019655, DA-19655, DA 03194, P30DA015663, DA15663, R01DA003194)
  • National Institute of Neurological Disorders and Stroke (NS11323, R01NS011323)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
Keywords
nicotinic acetylcholine receptors, alpha5 subunit, agonist affinity, epibatidine binding, thalamus, striatum, nicotine sensitivity, mouse brain
MeSH terms
Animals, Behavior, Animal, Binding, Competitive, Brain, Corpus Striatum, Mice, Inbred C57BL, Mice, Neurologic Mutants, Organ Specificity, Pyridines, Receptors, Nicotinic, Rubidium Radioisotopes, Thalamus, Nicotinic Agonists, Bridged Bicyclo Compounds, Heterocyclic, Immunoprecipitation, Mice

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