The cellular distributions of alpha-amino-3-hydroxy-5-methyl-4- isoxazole propionic acid (AMPA) receptors within the rodent and nonhuman primate basal forebrain magnocellular complex (BFMC) were demonstrated immunocytochemically using anti-peptide antibodies that recognize glutamate receptor (GluR) subunit proteins (i.e., GluR1, GluR4, and a conserved region of GluR2, GluR3, and GluR4c). In both species, many large GluR1-positive neuronal perikarya and aspiny dendrites are present within the medial septal nucleus, the nucleus of the diagonal band of Broca, and the nucleus basalis of Meynert. In this population of neurons in rat and monkey, GluR2/3/4c and GluR4 immunoreactivities are less abundant than GluR1 immunoreactivity. In rat, GluR1 does not colocalize with ChAT, but, within many neurons, GluR1 does colocalize with GABA, glutamic acid decarboxylase (GAD), and parvalbumin immunoreactivities. GluR1- and GABA/GAD-positive neurons intermingle extensively with ChAT-positive neurons. In monkey, however, most GluR1-immunoreactive neurons express ChAT and calbindin-D28 immunoreactivities. The results reveal that noncholinergic GABAergic neurons, within the BFMC of rat, express AMPA receptors, whereas cholinergic neurons in the BFMC of monkey express AMPA receptors. Thus, the cellular localizations of the AMPA subtype of GluR are different within the BFMC of rat and monkey, suggesting that excitatory synaptic regulation of distinct subsets of BFMC neurons may differ among species. We conclude that, in the rodent, BFMC GABAergic neurons receive glutamatergic inputs, whereas cholinergic neurons either do not receive glutamatergic synapses or utilize GluR subtypes other than AMPA receptors. In contrast, in primate, basal forebrain cholinergic neurons are innervated directly by glutamatergic afferents and utilize AMPA receptors.
Cellular localizations of AMPA glutamate receptors within the basal forebrain magnocellular complex of rat and monkey
L. Martin,C. Blackstone,A. Levey,R. Huganir,D. Price
Published 1993 in Journal of Neuroscience
ABSTRACT
PUBLICATION RECORD
- Publication year
1993
- Venue
Journal of Neuroscience
- Publication date
1993-05-01
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- ampa receptors
Ionotropic glutamate receptors that mediate fast excitatory synaptic transmission in the central nervous system.
Aliases: alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors
- basal forebrain magnocellular complex
A brain region containing large neuronal cell bodies involved in arousal and attention, including the medial septal nucleus and nucleus basalis of Meynert.
Aliases: BFMC
- cholinergic neurons
Neurons that utilize acetylcholine as a neurotransmitter, identified here by choline acetyltransferase (ChAT) or calbindin-D28 immunoreactivity.
Aliases: ChAT-positive neurons
- gabaergic neurons
Inhibitory neurons that utilize gamma-aminobutyric acid as a neurotransmitter, identified here by GABA, GAD, or parvalbumin immunoreactivity.
Aliases: GABA/GAD-positive neurons
- glur1
A specific subunit protein of the AMPA glutamate receptor detected in this study using anti-peptide antibodies.
REFERENCES
Showing 1-95 of 95 references · Page 1 of 1