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Cocaine alters behavior in the rat fetus
D K Simonik1, S R Robinson, W P Smotherman
1Department of Psychology, Binghamton University, New York 13902-6000.
Behavioral Neuroscience
|October 1, 1993
Summary
Cocaine exposure in rat fetuses increased motor activity and disrupted sensory responses. This suggests cocaine impairs fetal sensorimotor integration and behavioral development.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Prenatal exposure to cocaine can negatively impact fetal development.
- Understanding the specific effects on the developing central nervous system is crucial.
Purpose of the Study:
- To characterize changes in motor behavior and sensory responsiveness in rat fetuses exposed to cocaine.
- To investigate the impact of cocaine on sensorimotor integration in utero.
Main Methods:
- Acute administration of varying cocaine doses (5, 10, 20 mg/kg) to rat fetuses on gestational Day 21.
- Behavioral bioassays to assess cutaneous and chemosensory responsiveness.
- Monitoring fetal motor activity and behavioral responses to stimuli.
Main Results:
- Increased fetal motor activity observed at higher cocaine doses (10 and 20 mg/kg).
- Reduced facial wiping response to cutaneous (10 and 20 mg/kg) and chemosensory (20 mg/kg) stimuli.
- Fetuses detected and responded to stimuli, indicating sensorimotor disruption rather than lack of detection.
Conclusions:
- Prenatal cocaine exposure disrupts sensorimotor integration and motor coordination in developing rat fetuses.
- In vivo fetal studies offer insights into cocaine's neurodevelopmental toxicity.
- Findings highlight the detrimental effects of cocaine on fetal central nervous system development.