Cited by 127Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeuroscience and Neuropharmacology Research

Chronic nicotine and mecamylamine treatment increase brain nicotinic receptor binding without changing alpha 4 or beta 2 mRNA levels

Pauly, J R, Marks, M J, Robinson, S F, van de Kamp, J L, Collins, A C·1996·The Journal of Pharmacology and Experimental Therapeutics

Abstract

It has recently been shown using regionally dissected tissue that both chronic mecamylamine treatment and chronic nicotine treatment increase the number of [3H]-nicotine binding sites in mouse brain, and that additive increases in the number of binding sites is observed after cotreatment with the two drugs. The studies reported here extend these findings by using quantitative autoradiographic methods to analyze the brains of chronically treated mice at a finer anatomical level of resolution. DBA/2 mice were chronically infused (i.v.) with saline, 4.0 mg/ kg/hr nicotine, 4.0 mg/kg/hr mecamylamine or both drugs for 7 days. The brains of these mice were subsequently analyzed to determine the effects of chronic drug treatment on [3H]-nicotine binding and on the levels of mRNA encoding the nicotinic receptor subunits, alpha 4 and beta 2. [3H]-Nicotine binding was increased in 37 of 46 brain regions after chronic nicotine treatment (average increase = 66.5%), in 41 of 46 regions after chronic mecamylamine treatment (average increase = 56.5%), and in 45 of 46 brain regions after chronic treatment with both drugs (average increase = 107.1%). The changes in [3H]-nicotine binding produced by the two drugs across brain regions were highly (r = 0.98) and significantly correlated. These results are consistent with the proposal that the same receptors are affected by agonist or antagonist treatment. Chronic treatment had no significant effect on the levels of alpha 4 or beta 2 mRNA as measured by in situ hybridization. Therefore, the increases in [3H]-nicotine binding do not arise from changes in the steady-state levels of either alpha 4 or beta 2 mRNA which are believed to encode the subunits of this nicotinic receptor subtype.

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Crossref · 10.1016/s0022-3565(25)20143-4

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Authors
Pauly, J. R., Marks, M. J., Robinson, S. F., van de Kamp, J. L., & Collins, A. C.
Affiliations
Augusta University (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
1996-07
Volume
278
Issue
1
Pages
361-369
ISSN
0022-3565 (ISSN-L)
OpenAlex
W1820461132
Cited by
126
References
0
Citations by year
2022: 2 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 2 · 2016: 5 · 2015: 9 · 2014: 3 · 2013: 8 · 2012: 7
FWCI
1.77
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed
Funders
  • National Institutes of Health (5k05da000197-07)
  • National Institute on Drug Abuse (DA 03194, DA00197, R01DA003194)
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 treatment, mecamylamine, receptor mRNA expression, receptor up-regulation, DBA/2 mice
MeSH terms
Animals, Autoradiography, Binding, Competitive, Brain, Female, Mecamylamine, Mice, Inbred DBA, Nicotine, RNA, Messenger, Up-Regulation, Mice

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