Cited by 43Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchReceptor Mechanisms and Signaling

Cell autonomy, receptor autonomy, and thermodynamics in nicotine receptor up-regulation

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Nashmi, Raad, Lester, Henry·2007·Biochemical Pharmacology

Abstract

Chronic nicotine exposure, in smokers or in experimental rodents administered nicotine, produces elevated levels of nicotinic acetylcholine receptors in several brain regions. However, there are few data on up-regulation of receptors in specific neuronal subtypes. We tested whether functional up-regulation of nicotinic responses occurs in cultured GABAergic neurons of the ventral midbrain. Fura-2 measurements of nicotinic responses were made on ventral midbrain neurons from knock-in mice heterozygous for the alpha4-M2 domain Leu9'Ala mutation, which confers nicotine hypersensitivity. Chronic nicotine exposure at a concentration (10 nM for 3 days) that activates only the hypersensitive alpha4* (Leu9'Ala) receptors, but not wild-type receptors, resulted in significant potentiation of ACh (100 microM)-elicited responses. Experiments were also performed on midbrain neuronal cultures heterozygous for the alpha4* (Leu9'Ala) mutation as well as for a GFP protein fused to a GABA transporter that reliably reveals GABAergic neurons. In cultures chronically treated with 10nM nicotine, there was significantly increased alpha4* nicotinic-induced Ca(2+) influx elicited by low concentration of ACh (3 microM). Furthermore, chronic exposure to the competitive antagonist dihydro-beta-erythroidine, but not to the noncompetitive antagonist mecamylamine, induced up-regulation of ACh elicited nicotinic responses. These results suggest that occupation of alpha4* nicotinic receptor binding site(s), at the interface between two subunits, is sufficient to promote assembly and/or up-regulation of functional receptors in GABAergic neurons. Up-regulation in neurons is both "cell-autonomous", occurring at the cell itself, and "receptor autonomous", occurring at the receptor itself, and may be a thermodynamic necessity of ligand-protein interactions.

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Crossref · 10.1016/j.bcp.2007.06.040

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Authors
Nashmi, R., & Lester, H.
Affiliations
California Institute of Technology (US)
Corresponding author
Lester, Henry
Venue
Biochemical Pharmacology
Publisher
Elsevier BV
Published
2007-10
Volume
74
Issue
8
Pages
1145-1154
ISSN
0006-2952 (ISSN-L)
OpenAlex
W2086750594
Cited by
43
References
60
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2021: 1 · 2019: 2 · 2018: 2 · 2017: 1 · 2016: 2 · 2015: 2 · 2014: 3 · 2013: 1 · 2012: 1
FWCI
2.91
Type
journal article
Language
en
Open access
Locations
  • Biochemical Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Drug Abuse (DA17279, R01DA017279)
  • National Institute of Neurological Disorders and Stroke (NS 11756, R01NS011756)
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
nicotinic acetylcholine receptors, receptor up-regulation, chronic nicotine exposure, GABAergic neurons, ventral midbrain, calcium influx, dihydro-beta-erythroidine, mecamylamine, protein-ligand interactions, receptor assembly, cell autonomy
MeSH terms
Animals, Cells, Cultured, Dihydro-beta-Erythroidine, Mecamylamine, Mesencephalon, Nicotine, Receptors, Nicotinic, Thermodynamics, Up-Regulation, Mice

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