Cited by 173Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationReceptor Mechanisms and Signaling

Acetylcholine Receptor (AChR) α5 Subunit Variant Associated with Risk for Nicotine Dependence and Lung Cancer Reduces (α4β2)2α5 AChR Function

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Kuryatov, Alexander, Berrettini, Wade, Lindstrom, Jon·2011·Molecular Pharmacology

Abstract

Genomic studies have identified a D398N variation in the α5 subunit of nicotinic acetylcholine receptors (AChRs) that increases risk of nicotine dependence and lung cancer. (α4β2)₂α5 AChRs are a significant brain presynaptic subtype in brain. Their high sensitivity to activation by nicotine and high Ca²+ permeability give them substantial functional impact. α3β4* and α3β2* AChRs are predominant postsynaptic AChRs in the autonomic nervous system, but rare in brain. The amino acid 398 of α5 is located in the large cytoplasmic domain near the amphipathic α helix preceding the M4 transmembrane domain. These helices have been shown to influence AChR conductance by forming portals to the central channel. We report that α5 Asn 398 lowers Ca²+ permeability and increases short-term desensitization in (α4β2)₂α5 but not in (α3β4)₂α5 or (α3β2)₂α5 AChRs. This suggests that a positive allosteric modulator would augment nicotine replacement therapy for those with this risk variant. α5 D398N variation does not alter sensitivity to activation. The high sensitivity to activation and desensitization of (α4β2)₂α5 AChRs by nicotine results in a narrow concentration range in which activation and desensitization curves overlap. This region centers on 0.2 μM nicotine, a concentration typically sustained in smokers. This concentration would desensitize 60% of these AChRs and permit smoldering activation of the remainder. The low sensitivity to activation and desensitization of (α3β4)₂α5 AChRs by nicotine results in a broad region of overlap centered near 10 μM. Thus, at the nicotine concentrations in smokers, negligible activation or desensitization of this subtype would occur.

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  • The impact of the mutation defining the risk allele has been validated repeatedly in vitro and in animal models.

    “The impact of the mutation that defines the risk allele has been validated repeatedly in vitro and in animal models (Kuryatov et al. 2011; Morel et al. 2014).”

    From Nicotine Withdrawal (2015) · cites this paper as Kuryatov et al. 2011

    The Introduction identifies D398N as the risk variant, and the Results and Table 1 report functional effects measured in expressed receptors and oocytes, supporting the in vitro part of the claim. The cited paper does not report validation of this mutation in an animal model, so it does not support that part of the sentence. (LLM, conf=0.86)

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Authors
Kuryatov, A., Berrettini, W., & Lindstrom, J.
Affiliations
University of Pennsylvania (US)
Venue
Molecular Pharmacology
Publisher
Elsevier BV
Published
2011-01
Volume
79
Issue
1
Pages
119-125
ISSN
0026-895X (ISSN-L)
OpenAlex
W2005131991
Cited by
171
References
38
Citations by year
2026: 2 · 2025: 3 · 2024: 6 · 2023: 4 · 2022: 5 · 2021: 9 · 2020: 11 · 2019: 8 · 2018: 14 · 2017: 12 · 2016: 13 · 2015: 16 · 2014: 16 · 2013: 15 · 2012: 22
FWCI
6.77
Type
journal article
Language
en
Open access
Locations
  • Molecular Pharmacology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Drug Abuse (R01DA030929, DA025201, R01DA025201)
  • National Institute of Neurological Disorders and Stroke (NS11323, R01NS011323)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
nicotinic acetylcholine receptors, alpha5 subunit, nicotine dependence, lung cancer risk, calcium permeability, receptor desensitization, nicotine sensitivity, allosteric modulators, nicotine replacement therapy, presynaptic nicotinic receptors
MeSH terms
Animals, Cell Line, Female, Humans, Lung Neoplasms, Nerve Tissue Proteins, Receptors, Nicotinic, Risk Factors, Tobacco Use Disorder, Genetic Variation, Xenopus laevis, Protein Subunits

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