Cited by 50Neurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology ResearchNeurological disorders and treatments

The mediodorsal nucleus of the thalamus in rats: II. Behavioral and neurochemical effects of GABA agonists

Churchill, L., Zahm, D.S., Duffy, P., Kalivas, P.W.·1996·Neuroscience

Abstract

The aim of this study was to determine how GABA receptors in the mediodorsal nucleus of the thalamus in rats might contribute to the regulation of locomotor behavior. Microinjections of the GABAB and GABAA agonists, baclofen and muscimol, into the mediodorsal nucleus produced dose-dependent increases in locomotion that were blocked by co-administration of the GABAB antagonist, 2-hydroxysaclofen. Microinjection of baclofen along the midline, lateral into the ventrolateral thalamus or into the lateral ventricles produced significantly smaller dose-dependent increases in locomotion, indicating that the anatomical locus for baclofen-induced locomotion resides in the mediodorsal nucleus. The motor response elicited by microinjected baclofen was associated with a reduction in dopamine metabolism in the prefrontal cortex and an increase in metabolism in the core of the nucleus accumbens, but not in the accumbal shell or the dorsolateral striatum. These results suggest that GABAergic afferents to the mediodorsal nucleus may oppose a tonic inhibitory tone on locomotor activity. The data also suggest that the motor response produced by baclofen in the mediodorsal thalamus may arise by inhibiting the projections to the prefrontal cortex which modulate mesocorticolimbic dopamine transmission.

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Crossref · 10.1016/0306-4522(95)00352-j

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Authors
Churchill, L., Zahm, D. S., Duffy, P., & Kalivas, P. W.
Affiliations
  • Washington State University (US)
  • Saint Louis University (US)
Corresponding author
Churchill, L.
Venue
Neuroscience
Publisher
Elsevier BV
Published
1996-01
Volume
70
Issue
1
Pages
103-112
ISSN
0306-4522 (ISSN-L)
OpenAlex
W1991194251
Cited by
50
References
64
Citations by year
2025: 1 · 2023: 1 · 2022: 2 · 2017: 1 · 2016: 2 · 2015: 2 · 2012: 4
FWCI
0.94
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (R01MH040817, MH-40817)
  • National Institute on Drug Abuse (DA03906, DA-00158)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
Keywords
mediodorsal nucleus, thalamus, GABA receptors, baclofen, muscimol, locomotor behavior, GABA-B receptor agonist, GABA-A receptor agonists, 2-hydroxysaclofen, dopamine metabolism, prefrontal cortex, nucleus accumbens, GABAergic afferents, tonic inhibition
MeSH terms
Animals, Baclofen, Behavior, Animal, Dose-Response Relationship, Drug, Locomotion, Male, Muscimol, Thalamus, Rats, Sprague-Dawley, Rats

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