Cited by 40Neurotransmitter Receptor Influence on BehaviorSchizophrenia research and treatmentSubstance Abuse Treatment and Outcomes

Differences in D2 dopamine receptor availability and reaction to novelty in socially housed male monkeys during abstinence from cocaine

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Czoty, Paul W., Gage, H. Donald, Nader, Michael A.·2010·Psychopharmacology

Abstract

Rationale Studies in socially housed monkeys have demonstrated an influence of position in the social dominance hierarchy on brain dopamine D2 receptors and the reinforcing effects of cocaine that dissipates after long-term cocaine self-administration.Objective The aims of the study were to examine the effects of abstinence from cocaine on D2 receptors in socially housed monkeys and to extend behavioral characterizations to measures of reactivity to a novel object.Materials and methods Twelve socially housed male cynomolgus monkeys with extensive cocaine self-administration experience were used (average lifetime intakes ∼270 and 215 mg/kg for dominant and subordinate monkeys, respectively). Abstinence lasted for approximately 8 months, after which D2 receptor availability was assessed using positron emission tomography and the D2 ligand [18F]fluoroclebopride. Reaction to novelty was also assessed in these subjects as well as nine individually housed monkeys.Results During abstinence, D2 receptor availability in the caudate nucleus was significantly higher in dominant versus subordinate monkeys. Average latency to touch a novel object was also significantly higher in dominant monkeys compared to subordinates or individually housed monkeys. In socially experienced monkeys, a significant positive correlation was observed between caudate nucleus D2 receptor availability and latencies to touch the novel object.Conclusions Although chronic cocaine self-administration blunts the ability of social dominance to alter D2 receptor availability and sensitivity to the reinforcing effects of cocaine, this influence reemerges during abstinence. In addition, the data suggest that prior experience with social dominance can lead to longer latencies in reaction to novelty--a personality trait associated with low vulnerability to cocaine abuse.

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Authors
Czoty, P. W., Gage, H. D., & Nader, M. A.
Affiliations
Wake Forest University Health Sciences (US)
Corresponding author
Nader, Michael A.
Venue
Psychopharmacology
Published
2010-01-13
Volume
208
Issue
4
Pages
585-592
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W1992295481
Cited by
40
References
36
Citations by year
2023: 4 · 2022: 1 · 2021: 3 · 2020: 6 · 2019: 1 · 2018: 2 · 2017: 2 · 2016: 2 · 2015: 4 · 2014: 3 · 2013: 4 · 2012: 3
FWCI
1.55
Type
journal article
Language
en
Open access
Locations
  • Psychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Drug Abuse (R37DA010584, R37 DA10584)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
Keywords
cocaine abstinence, social dominance hierarchy, novelty reactivity, caudate nucleus, cocaine self-administration, personality traits, Macaca fascicularis
MeSH terms
Animals, Caudate Nucleus, Cocaine, Disease Models, Animal, Exploratory Behavior, Fluorine Radioisotopes, Hierarchy, Social, Housing, Animal, Macaca fascicularis, Male, Putamen, Radioligand Assay, Self Administration, Receptors, Dopamine D2, Cocaine-Related Disorders, Positron-Emission Tomography

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