Cited by 232Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeuroscience and Neuropharmacology Research

Regulation of Nicotinic Acetylcholine Receptor Numbers and Function by Chronic Nicotine Exposure

Gentry, C., Lukas, R.·2002·Current Drug Target -CNS & Neurological Disorders

Abstract

Recent advances concerning effects of chronic nicotine exposure on nicotinic acetylcholine receptor (nAChR) expression are reviewed. Implications are assessed of these findings for roles of nAChR in health and disease and for design of drugs for treatment of neurological and psychiatric disorders. Most studies continue to show that chronic nicotine exposure induces increases in numbers of nAChR-like binding or antigenic sites ("upregulation") across all nAChR subtypes investigated, but with time- and dose-dependencies and magnitudes for these effects that are unique to subsets of nAChR subtypes. These effects appear to be post-transcriptionally based, but mechanisms involved remain obscure. With notable exceptions, most studies also show that chronic nicotine exposure induces several phases of nAChR functional loss ("desensitization" and longer-lasting "persistent inactivation") assessed in response to acute nicotinic agonist challenges. Times for onset and recovery and dose-dependencies for nicotine-induced functional loss also are nAChR subtype-specific. Some findings suggest that upregulation and functional loss are not causally- or mechanistically-related. It is suggested that upregulation is not as physiologically significant in vivo as functional effects of chronic nicotine exposure. By contrast, brain levels of nicotine in tobacco users, and perhaps levels of acetylcholine in the extracellular space, clearly are in the range that would alter the balance between nAChR in functionally ready or inactivated states. Further work is warranted to illuminate how effects of chronic nicotinic ligand exposure are integrated across nAChR subtypes and the neuronal circuits and chemical signaling pathways that they service to produce nicotine dependence and/or therapeutic benefit.

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Crossref · 10.2174/1568007023339184

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Authors
Gentry, C., & Lukas, R.
Affiliations
Barrow Neurological Institute (US)
Venue
Current Drug Target -CNS & Neurological Disorders
Published
2002-08-01
Volume
1
Issue
4
Pages
359-385
ISSN
1568-007X (ISSN-L)
OpenAlex
W2024690874
Cited by
232
References
0
Citations by year
2026: 1 · 2025: 4 · 2024: 4 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 25 · 2019: 3 · 2018: 4 · 2017: 5 · 2016: 14 · 2015: 5 · 2014: 8 · 2013: 12 · 2012: 7
FWCI
2.99
Type
journal article
Language
en
Open access
closed
Locations
  • CNS & Neurological Disorders - Drug Targets (publishedVersion)
  • PubMed (publishedVersion)
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 › Neuroscience and Neuropharmacology Research
Keywords
nicotinic acetylcholine receptors, chronic nicotine exposure, receptor up-regulation, receptor desensitization, nAChR subtypes, post-transcriptional regulation, nicotine dependence, acetylcholine, tobacco use, nicotinic agonists
MeSH terms
Animals, Humans, Ligands, Nicotine, Receptors, Nicotinic, Tobacco Use Disorder, Up-Regulation, Nicotinic Agonists

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