Cited by 81Neurotransmitter Receptor Influence on BehaviorMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Distribution of dopamine D2-like receptors in the rat amygdala and their role in the modulation of unconditioned fear and anxiety

de la Mora, M. Perez, Gallegos-Cari, A., Crespo-Ramirez, M., Marcellino, D., Hansson, A.C., Fuxe, K.·2012·Neuroscience

Abstract

Amygdaloid dopamine D(2) receptors play an important role in the modulation of fear/anxiety. Their topographical distribution within the amygdala is however unclear, and their role in unconditioned fear/anxiety remains largely unknown. The aim of this paper was to study the intra-amygdaloid distribution of D(2) receptors and to ascertain their role in unconditioned anxiety. Chemical anatomical studies in the rat, using D(2) and D(3)in situ hybridization, quantitative receptor autoradiography with either [(3)H]raclopride or [(125)I]sulpiride, and D(2)-like immunocytochemistry showed that the highest density of dopamine D(2) receptors is present in the central amygdaloid nucleus, particularly within its latero-capsular division, in which a D(2) but not a D(3) mRNA signal was observed. However, although at considerably reduced densities dopamine D(2) receptors were also found in other locations within the amygdala, including the basolateral nucleus. Behaviorally, the infusion of raclopride (0.75-4 μg/side) in the area of the central amygdaloid nucleus resulted at low doses in the appearance of anxiogenic-like effects in the Shock-Probe Burying test, whereas no effects of raclopride treatment were found at any dose in the Elevated Plus-Maze and the Open-Field test. Our results indicate that amygdaloid dopamine D(2)-like receptors have a topographically differentiated distribution within the rat amygdala, the major location being in the central amygdaloid nucleus. D(2)-like receptors play a role in the modulation of anxiety responses involving a potential differential function of D(2)-like receptors in the central amygdaloid nucleus versus the basolateral amygdaloid nucleus.

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Crossref · 10.1016/j.neuroscience.2011.10.045

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Authors
de la Mora, M. P., Gallegos-Cari, A., Crespo-Ramirez, M., Marcellino, D., Hansson, A. C., & Fuxe, K.
Affiliations
  • Karolinska Institutet (SE)
  • Central Institute of Mental Health (DE)
Venue
Neuroscience
Publisher
Elsevier BV
Published
2012-01
Volume
201
Pages
252-266
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2020505550
Cited by
81
References
86
Citations by year
2026: 2 · 2025: 7 · 2024: 4 · 2023: 6 · 2022: 9 · 2021: 2 · 2020: 8 · 2019: 5 · 2018: 8 · 2017: 2 · 2016: 6 · 2015: 4 · 2014: 7 · 2013: 6 · 2012: 5
FWCI
2.38
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (HA 6102/1-1)
  • Deutsche Forschungsgemeinschaft
  • Medicinska Forskningsrådet (04X-715)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
dopamine D2 receptor, dopamine D3 receptor, amygdala, central amygdala, unconditioned fear, raclopride, sulpiride, receptor distribution, anxiogenic effects
MeSH terms
Amygdala, Analysis of Variance, Animals, Anxiety, Autoradiography, Conditioning, Psychological, Dose-Response Relationship, Drug, Electroshock, Exploratory Behavior, Fear, Gene Expression Regulation, Male, RNA, Messenger, Rats, Wistar, Receptors, Dopamine D2, Dopamine Antagonists, Maze Learning, Raclopride, Receptors, Dopamine D3, Rats

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