Cited by 583Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationReceptor Mechanisms and Signaling

Varenicline Is a Partial Agonist at α4β2 and a Full Agonist at α7 Neuronal Nicotinic Receptors

Mihalak, Karla B., Carroll, F. Ivy, Luetje, Charles W.·2006·Molecular Pharmacology

Abstract

Varenicline, a new nicotinic ligand based on the structure of cytisine, has recently been approved by the U.S. Food and Drug Administration for use as a smoking cessation aid. Varenicline has been shown to be a partial agonist of alpha4beta2 receptors, and in equilibrium binding assays, it is highly selective for the alpha4beta2 receptor. In this study, we have examined the functional activity of varenicline at a variety of rat neuronal nicotinic receptors expressed in Xenopus laevis oocytes and assayed under two-electrode voltage clamp. We also find that varenicline is a potent, partial agonist at alpha4beta2 receptors, with an EC50 of 2.3 +/- 0.3 microM and an efficacy (relative to acetylcholine) of 13.4 +/- 0.4%. Varenicline has lower potency and higher efficacy at alpha3beta4 receptors, with an EC50 of 55 +/- 8 microM and an efficacy of 75 +/- 6%. Varenicline also seems to be a weak partial agonist at alpha3beta2 and alpha6-containing receptors, with an efficacy <10%. It is remarkable that varenicline is a potent, full agonist at alpha7 receptors with an EC50 of 18 +/- 6 microM and an efficacy of 93 +/- 7% (relative to acetylcholine). Thus, whereas varenicline is a partial agonist at some heteromeric neuronal nicotinic receptors, it is a full agonist at the homomeric alpha7 receptor. Some combination of these actions may be involved in the mechanism of varenicline as a smoking cessation aid.

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Crossref · 10.1124/mol.106.025130

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Authors
Mihalak, K. B., Carroll, F. I., & Luetje, C. W.
Affiliations
  • University of Miami (US)
  • RTI International (US)
Venue
Molecular Pharmacology
Publisher
Elsevier BV
Published
2006-09
Volume
70
Issue
3
Pages
801-805
ISSN
0026-895X (ISSN-L)
OpenAlex
W2141246891
Cited by
558
References
26
Citations by year
2026: 12 · 2025: 8 · 2024: 7 · 2023: 23 · 2022: 14 · 2021: 15 · 2020: 20 · 2019: 19 · 2018: 22 · 2017: 32 · 2016: 41 · 2015: 40 · 2014: 44 · 2013: 48 · 2012: 36
FWCI
10.88
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Miami
  • U.S. Food and Drug Administration
  • National Heart, Lung, and Blood Institute (T32HL007188)
  • National Institute of Mental Health (MH-66038, R01MH066038)
  • National Institute on Drug Abuse (R01DA012001, DA12001, DA08102, R01DA008102)
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
varenicline, neuronal nicotinic acetylcholine receptors, alpha4beta2 receptor, partial agonists, full agonists, receptor selectivity, smoking cessation, cytisine derivatives
MeSH terms
Varenicline, Animals, Benzazepines, Neurons, Oocytes, Quinoxalines, Receptors, Nicotinic, Xenopus laevis, Nicotinic Agonists, Rats, alpha7 Nicotinic Acetylcholine Receptor

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