Cited by 110Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchSmoking Behavior and Cessation

Ultrastructural Localization of the α4-Subunit of the Neuronal Acetylcholine Nicotinic Receptor in the Rat Substantia Nigra

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Arroyo-Jiménez, Maria del Mar, Bourgeois, Jean-Pierre, Marubio, Lisa M., Le Sourd, Anne-Marie, Ottersen, Ole Petter, Rinvik, Eric, Fairén, Alfonso, Changeux, Jean-Pierre·1999·The Journal of Neuroscience

Abstract

The distribution of the alpha4-subunit of the neuronal nicotinic acetylcholine receptor (nAChR) in the rat brain was examined at light and electron microscopy levels using immunohistochemical staining. In the present study we demonstrate the specificity, in both tissue homogenates and brain sections, of a polyclonal antibody raised against the rat nAChR alpha4-subunit. The characterization of this antibody involved: (1) Western blot analysis of rat brain homogenates and membrane extracts from cells previously transfected with diverse combinations of neuronal nAChR subunits, and (2) immunohistochemistry using transfected cells and rat brain tissue. At the light microscope level, the alpha4-subunit-like-immunoreactivity (LI) was widely distributed in the rat brain and matched the distribution of the alpha4-subunit transcripts observed previously by in situ hybridization. Strong immunohistochemical labeling was detected in the mesencephalic dopaminergic nuclei. The nAChRs in this region are thought to be responsible for the modulation of dopaminergic transmission. The neurotransmitter identity of alpha4-immunolabeled neurons in the substantia nigra pars compacta (SNpc) and the ventral tegmental area was thus assessed by investigating the possible colocalization of the nAChR alpha4-subunit with tyrosine hydroxylase using confocal microscopy. The double labeling experiments unambiguously indicated that the alpha4-subunit-LI is present in dopaminergic neurons. At the electron microscope level, the neurons in the SNpc exhibited alpha4-subunit-LI in association with a minority of postsynaptic densities, suggesting that the alpha4-subunit may be a component of functional nAChRs mediating synaptic transmission between midbrain cholinergic neurons and mesencephalic dopaminergic neurons.

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Crossref · 10.1523/jneurosci.19-15-06475.1999

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  • Nicotinic acetylcholine receptors are not clustered at postsynaptic membranes apposed to sites of acetylcholine release, but are rather dispersed along the surface and intracellular compartments of neurons, including presynaptic terminals, cell bodies and axons.

    “nAChRs are not clustered at postsynaptic membranes apposed to sites of ACh release, but are rather dispersed along the surface (and intracellular compartments) of neurons, including presynaptic terminals (McGehee et al., 1995; Vidal and Changeux, 1993), cell bodies and even axons (Arroyo-Jimenez et al., 1999; Hill Jr. et al., 1993; Kawai et al., 2007).”
  • There is an anatomical mismatch between the sites of acetylcholine release and the location of cholinergic receptors.

    “There is an anatomical mismatch between the sites of ACh release (Houser, 1990; Wainer et al., 1984a; Wainer et al., 1984b) and the location of cholinergic receptors (Arroyo-Jimenez et al., 1999; Hill Jr. et al., 1993; Kawai et al., 2007).”

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Authors
Arroyo-Jiménez, M. D. M., Bourgeois, J.-P., Marubio, L. M., Le Sourd, A.-M., Ottersen, O. P., Rinvik, E., Fairén, A., & Changeux, J.-P.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • University of Oslo (NO)
  • Consejo Superior de Investigaciones Científicas (ES)
Venue
The Journal of Neuroscience
Published
1999-08-01
Volume
19
Issue
15
Pages
6475-6487
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1818352744
Cited by
110
References
91
Citations by year
2025: 2 · 2024: 1 · 2022: 2 · 2020: 1 · 2018: 3 · 2016: 2 · 2015: 3 · 2014: 2 · 2013: 1 · 2012: 2
FWCI
4.13
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Funders
  • National Alliance for Research on Schizophrenia and Depression
  • Comunidad de Madrid
  • European Commission
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
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
Keywords
nicotinic acetylcholine receptors, alpha4 subunit, substantia nigra, dopaminergic neurons, postsynaptic density, tyrosine hydroxylase, ventral tegmental area, antibody specificity, subcellular localization, rat brain
MeSH terms
Animals, Brain, Immunohistochemistry, Neurons, Receptors, Nicotinic, Substantia Nigra, Tissue Distribution, Tyrosine 3-Monooxygenase, Rats, Sprague-Dawley, Protein Isoforms, Rats

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