Cited by 34Neurotransmitter Receptor Influence on BehaviorSubstance Abuse Treatment and OutcomesNeural and Behavioral Psychology Studies

Effects of cocaine self-administration history under limited and extended access conditions on in vivo striatal dopamine neurochemistry and acoustic startle in rhesus monkeys

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Kirkland Henry, Porche’, Davis, Michael, Howell, Leonard L.·2009·Psychopharmacology

Abstract

Rationale The transition from infrequent and controlled cocaine use to dependence may involve enduring changes in neurobiology as a consequence of persistent drug use.Objective The present study utilized an intravenous drug self-administration protocol of increasing cocaine access to evaluate potential changes in dopamine function in vivo, including changes in sensitivity to psychostimulants.Materials and methods Drug-naïve rhesus monkeys were provided limited access (1 h) to cocaine self-administration for 60 days followed by 60 days under an extended access condition (4 h). Basal levels of striatal extracellular dopamine and its metabolites, as well as the effectiveness of cocaine and amphetamine to elevate dopamine, were determined with in vivo microdialysis before the initiation of cocaine self-administration and during limited and extended access. The effect of cocaine and amphetamine on the acoustic startle response was also examined to assess complementary behavioral changes as a function of drug history.Results Extended access to cocaine self-administration lead to increased daily intake compared to limited access conditions but did not result in escalated intake over time. However, cocaine- and amphetamine-induced increases in striatal dopamine were diminished as a function of cocaine self-administration history. Surprisingly, there was no effect of drug-taking history on sensitivity to psychostimulant-induced enhancement of startle amplitude.Conclusions The present experiments provide evidence of a hypofunctional dopamine system that is not associated with an escalation in drug intake or reflected in measures of acoustic startle.

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  • Dopamine levels are decreased in animals chronically exposed to drugs of abuse.

    “Dopamine levels are decreased in animals chronically exposed to drugs of abuse (Castner et al., 2000; Kirkland Henry et al., 2009; Lee et al., 2011; Maisonneuve et al., 1995; Melega et al., 2008; Segal and Kuczenski, 1992; Sorg et al., 1997).”

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Authors
Kirkland Henry, P., Davis, M., & Howell, L. L.
Affiliations
Emory University (US)
Corresponding author
Howell, Leonard L.
Venue
Psychopharmacology
Published
2009-04-14
Volume
205
Issue
2
Pages
237-247
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W2123766280
Cited by
34
References
41
Citations by year
2026: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 4 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 2 · 2014: 3 · 2013: 6 · 2012: 1
FWCI
0.83
Type
journal article
Language
en
Open access
Locations
  • Psychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • U.S. Public Health Service
  • National Institute on Drug Abuse (R01DA018294, Z01DA000517, K02DA000517, DA016589, R01DA016589, DA018294)
  • National Center for Research Resources (RR-00 165, P51RR000165)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
cocaine self-administration, extended access, restricted access, striatal dopamine, acoustic startle response, psychostimulant sensitivity, amphetamine, cocaine dependence, rhesus monkeys, in vivo microdialysis
MeSH terms
Acoustic Stimulation, Analysis of Variance, Animals, Behavior, Animal, Chromatography, High Pressure Liquid, Cocaine, Conditioning, Operant, Corpus Striatum, Dopamine, Dose-Response Relationship, Drug, Female, Homovanillic Acid, Macaca mulatta, Male, Phenols, Psychoacoustics, Reinforcement Schedule, Self Administration, Reflex, Startle, Styrenes, Time Factors, Microdialysis, Dopamine Uptake Inhibitors, Electrochemical Techniques

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