Cited by 126Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchReceptor Mechanisms and Signaling

Desensitization of Nicotine‐Stimulated [3H]Dopamine Release from Mouse Striatal Synaptosomes

Grady, Sharon R., Marks, Michael J., Collins, Allan C.·1994·Journal of Neurochemistry

Abstract

Potential desensitization of brain nicotinic receptors was studied using a [3H]dopamine release assay. Nicotine-stimulated [3H]dopamine release from mouse striatal synaptosomes was concentration-dependent with an EC50 of 0.33 +/- 0.13 microM and a Hill coefficient of 1.44 +/- 0.18. Desensitization by activating concentrations of nicotine had a similar EC50 and a half-time of 35 s. Concentrations of nicotine that evoked little release also induced a concentration-dependent desensitization (EC50 = 6.9 +/- 3.6 nM, t1/2 = 1.6-2.0 min, nH = 1.02 +/- 0.01). Both types of desensitization produced a maximum 75% decrease in [3H]dopamine release. Recovery from desensitization after exposure to low or activating concentrations of nicotine was time-dependent with half-times of 6.1 min and 12.4 min, respectively. Constants determined for binding of [3H]nicotine to striatal membrane at 22 degrees C included a KD of 3.7 +/- 0.5 nM, Bmax of 67.5 +/- 2.2 fmol/mg, and Hill coefficient of 1.07 +/- 0.06. Association of nicotine with membrane binding sites was biphasic with half-times of 9 s and 1.8 min. The fast rate process contributed 37% of the total reaction. Dissociation was a uniphasic process with a half-time of 1.6 min. Comparison of constants determined by the release and binding assays indicated that the [3H]-nicotine binding site could be the presynaptic receptor involved in [3H]dopamine release in mouse striatal synaptosomes.

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Crossref · 10.1046/j.1471-4159.1994.62041390.x

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Authors
Grady, S. R., Marks, M. J., & Collins, A. C.
Affiliations
University of Colorado Boulder (US)
Corresponding author
Collins, Allan C.
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
1994-04
Volume
62
Issue
4
Pages
1390-1398
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W2030003339
Cited by
126
References
33
Citations by year
2022: 1 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 3 · 2012: 2
FWCI
4.44
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01aa006391-07)
  • National Institute on Alcohol Abuse and Alcoholism (AA 06391)
  • National Institute on Drug Abuse (DA 03194, NIDA DA-00116, R01DA003194)
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 receptor desensitization, nicotine, dopamine release, striatal synaptosomes, receptor recovery, Hill coefficient, mouse striatum
MeSH terms
Animals, Corpus Striatum, Dopamine, Dose-Response Relationship, Drug, Drug Tolerance, Female, Kinetics, Mice, Inbred C57BL, Nicotine, Receptors, Nicotinic, Synaptosomes, Tritium, Mice

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