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Repetitive behaviors in monkeys are linked to specific striatal activation patterns
Esen Saka1, Claudia Goodrich, Patricia Harlan
1Department of Neurology, Akdeniz University Hospital, 07059 Antalya, Turkey.
Summary
Repeated cocaine exposure alters primate behavior. Specific patterns of striatal gene activation in monkeys predict behavioral changes, offering insights into drug-induced stereotypy and basal ganglia function.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Primate Models
Background:
- Psychomotor stimulants like cocaine can profoundly alter spontaneous human behavior with repeated exposure.
- Understanding the neurobiological underpinnings of these drug-induced behavioral changes is crucial for developing effective interventions.
Purpose of the Study:
- To develop and utilize a nonhuman primate model to investigate the neurobiology of psychostimulant-induced behavioral alterations.
- To correlate specific patterns of neuronal activation in the striatum with behavioral changes following cocaine exposure.
Main Methods:
- Ethogram-based behavioral assays were conducted on squirrel monkeys subjected to single or multiple cocaine treatments.
- Anatomical mapping of striatal neurons expressing early-gene proteins was performed in conjunction with behavioral analysis.
- Cocaine challenge was administered after chronic intermittent exposure to assess behavioral and neurobiological responses.
Main Results:
- A final cocaine challenge induced distinct, patterned behavioral changes in monkeys, impacting individual behavioral motifs.
- Striatal gene expression showed a striosome-predominant pattern alongside intense dorsal expression, particularly in the putamen.
- These specific gene expression patterns strongly predicted the degree of stereotypy observed in response to cocaine challenge.
Conclusions:
- Compartmentally and regionally specific striatal activation patterns modulate psychostimulant-induced behaviors in primates.
- Monitoring basal ganglia activity patterns may help elucidate neural mechanisms underlying drug-induced repetitive behaviors and stereotypy syndromes.