Cited by 187Neurotransmitter Receptor Influence on BehaviorSchizophrenia research and treatmentParkinson's Disease Mechanisms and Treatments

Long-Lasting Psychotomimetic Consequences of Repeated Low-Dose Amphetamine Exposure in Rhesus Monkeys

Castner, S·1999·Neuropsychopharmacology

Abstract

The dopamine hypothesis of schizophrenia posits that dopamine dysregulation plays a key role in the etiology of schizophrenia. In line with this hypothesis, repeated amphetamine (AMPH) exposure has been shown to alter dopamine systems and induce behaviors reminiscent of positive-like and negative-like symptoms in both human and nonhuman primates. The mechanisms by which AMPH produces disturbances in brain function and behavior are not fully understood. The present study has employed a novel AMPH regimen, 12 weeks of intermittent escalating low doses of AMPH, to produce a nonhuman primate model for the purpose of elucidating the behavioral and neural consequences of excessive dopamine exposure. Behavioral responses to acute AMPH challenge (0.4-0.46 mg/kg) were assessed prior to and following the chronic 12-week treatment regimen, and, at present monkeys have been followed out to 28 months post-treatment. After chronic treatment, enhanced behavioral responses to AMPH challenge were readily apparent at 5 days postwithdrawal, and, were still present at 28 months postwithdrawal. The enhanced behavioral responses to low-dose AMPH challenge that were observed in the present study resemble closely the behavioral profile that has been described for chronic high-dose AMPH treatment in monkeys; i.e., hallucinatory-like behaviors, static posturing, and fine-motor stereotypies were all exacerbated in response to AMPH injection. In some animals, acute challenges after chronic AMPH evoked aberrant behavioral responses that lasted for 4 days. AMPH-treated monkeys also exhibited a significant decrease in the incidence of motor stereotypies in the off-drug periods between challenges. The present results are the first to document persistent long-term behavioral effects of intermittent exposure to repeated low-dose AMPH treatment in nonhuman primates. These findings may lay the groundwork for the development of a primate mode of psychosis with possible positive-like and negative-like symptoms.

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Crossref · 10.1016/s0893-133x(98)00050-5

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Authors
Castner, S.
Affiliations
Yale University (US)
Corresponding author
Castner, S
Venue
Neuropsychopharmacology
Published
1999-01
Volume
20
Issue
1
Pages
10-28
ISSN
0893-133X (ISSN-L)
OpenAlex
W2086037111
Cited by
187
References
39
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2022: 4 · 2021: 3 · 2020: 44 · 2018: 2 · 2017: 3 · 2015: 7 · 2014: 8 · 2013: 6 · 2012: 4
FWCI
2.99
Type
journal article
Language
en
Open access
closed
Locations
  • Neuropsychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Mental Health (MH 44866, P50MH044866)
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 › Neurology › Parkinson's Disease Mechanisms and Treatments
Keywords
amphetamine, psychotomimetic effects, dopamine hypothesis of schizophrenia, rhesus monkeys, long-term behavioral effects, amphetamine challenge, motor stereotypies, dopamine dysregulation
MeSH terms
Amphetamine, Animals, Disease Models, Animal, Female, Hallucinogens, Hydrocortisone, Macaca mulatta, Pilot Projects, Prolactin, Psychotic Disorders, Time Factors

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