Cited by 62Neurotransmitter Receptor Influence on BehaviorMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Dopamine D2 receptors modulate the expression of contextual conditioned fear: role of the ventral tegmental area and the basolateral amygdala

de Souza Caetano, Kátia A., de Oliveira, Amanda R., Brandão, Marcus L.·2013·Behavioural Pharmacology

Abstract

Although dopaminergic systems are more commonly associated with the reinforcing effects of various stimuli, numerous reports have demonstrated a relationship between changes in dopaminergic transmission and aversive situations. In the present study, we examined the involvement of D1-like and D2-like receptors in the expression of conditioned freezing using the context as the conditioned stimulus. Intraperitoneal injections of the D1 agonist SKF38393 or the D1 antagonist SCH23390 did not change the conditioned freezing in rats subjected to the contextual fear paradigm. In contrast, intraperitoneal injections of the D2 agonist quinpirole and the D2 antagonist sulpiride caused a significant dose-dependent reduction in the expression of contextual conditioned freezing. As these data may reflect that the systemic manipulations acted on dopaminergic receptors in different brain areas, the effects of administration of quinpirole and sulpiride into the ventral tegmental area (VTA) and the basolateral amygdala complex (BLA) on the expression of contextual conditioned freezing were also evaluated. Intra-VTA quinpirole and intra-BLA sulpiride injections reduced the conditioned freezing response; intra-VTA sulpiride and intra-BLA quinpirole injections had no significant effects. These data suggest that D2-like receptors, but not D1-like receptors, play an important role in the expression of contextual conditioned freezing. Quinpirole may act at D2 presynaptic receptors located in the VTA, decreasing dopamine levels in the terminal fields of the mesolimbic pathway. The effects of sulpiride, in contrast, appear to be triggered by an action on postsynaptic dopaminergic receptors located in the BLA. However, it cannot be totally excluded that the injected solutions did not also affect neighboring amygdalar regions. Together with previous findings, the present data suggest the need to consider dopaminergic mechanisms in the mesolimbic circuit as novel targets for the pharmacological treatment of fear-related disorders, especially post-traumatic stress disorder.

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Crossref · 10.1097/fbp.0b013e32836356c4

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Authors
de Souza Caetano, K. A., de Oliveira, A. R., & Brandão, M. L.
Affiliations
Universidade de São Paulo (BR)
Venue
Behavioural Pharmacology
Published
2013-08
Volume
24
Issue
4
Pages
264-274
ISSN
0955-8810 (ISSN-L)
OpenAlex
W2025469475
Cited by
62
References
83
Citations by year
2025: 3 · 2024: 6 · 2023: 10 · 2022: 4 · 2021: 4 · 2020: 6 · 2019: 3 · 2018: 3 · 2017: 3 · 2016: 8 · 2015: 6 · 2014: 5 · 2013: 1
FWCI
3.27
Type
journal article
Language
en
Open access
closed
Locations
  • Behavioural Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fundação de Amparo à Pesquisa do Estado de São Paulo
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
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, D1-like receptors, contextual fear, conditioned freezing, quinpirole, sulpiride, ventral tegmental area, basolateral amygdala, mesolimbic system, presynaptic dopamine receptors, postsynaptic dopamine receptors, post-traumatic stress disorder, fear-related disorders
MeSH terms
Amygdala, Animals, Conditioning, Psychological, Electroshock, Exploratory Behavior, Fear, Male, Microinjections, Dopamine Agents, Rats, Wistar, Receptors, Dopamine D2, Ventral Tegmental Area, Freezing Reaction, Cataleptic, Rats

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