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Perinatal diazepam exposure: alterations in exploratory behavior and mesolimbic dopamine turnover
R J Gruen1, A Y Deutch, R H Roth
1Department of Psychology, New York University, NY 10003.
Pharmacology, Biochemistry, and Behavior
|May 1, 1990
Summary
Perinatal diazepam exposure in rats reduced adult exploratory behavior, potentially linked to altered mesolimbic dopamine function. These effects were specific to adulthood, not seen in neonates.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pharmacology
Background:
- Perinatal exposure to diazepam can impact neonatal motor and exploratory behaviors.
- These behaviors are often linked to dopamine system activity in the brain.
- Understanding long-term effects of perinatal drug exposure is crucial for developmental neuroscience.
Purpose of the Study:
- To investigate the long-term effects of perinatal diazepam exposure on adult rat behavior.
- To examine the relationship between perinatal diazepam and mesotelencephalic dopamine turnover in adult rats.
- To determine if behavioral changes are developmentally specific.
Main Methods:
- Administered diazepam during the perinatal period in rats.
- Assessed exploratory and locomotor behavior in adult offspring.
- Measured dopamine turnover in specific brain regions (mesolimbic, mesostriatal) of adult rats.
Main Results:
- Perinatal diazepam exposure resulted in significantly reduced exploratory behavior in adult rats (90 days old).
- This behavioral deficit was not observed at an earlier age (60 days).
- Dopamine turnover was altered specifically in the nucleus accumbens and ventral tegmental area, key mesolimbic sites.
Conclusions:
- Perinatal benzodiazepine exposure can induce lasting behavioral changes into adulthood.
- Altered exploratory behavior in adulthood may be associated with changes in mesolimbic dopamine pathways.
- Developmental timing is critical for the manifestation of diazepam's long-term neurobehavioral effects.