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Behavioral effects of prenatal haloperidol exposure
F M Scalzo1, S F Ali, R R Holson
1Division of Reproductive and Developmental Toxicology, National Center for Toxicological Research, Jefferson, AR 72079.
Pharmacology, Biochemistry, and Behavior
|December 1, 1989
Summary
Prenatal haloperidol (HAL) exposure in rats reduced early-life arousal and activity. These effects diminished with age, suggesting dynamic developmental changes in offspring behavior following maternal HAL treatment.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pharmacology
Background:
- Maternal exposure to antipsychotic medications during pregnancy requires careful assessment of potential offspring neurodevelopmental effects.
- Haloperidol (HAL) is a typical antipsychotic with known effects on neurotransmitter systems, necessitating investigation into its developmental impact.
Purpose of the Study:
- To investigate the long-term behavioral effects of prenatal haloperidol exposure in albino rats.
- To assess how early-life behavioral changes induced by prenatal HAL exposure evolve throughout maturation.
Main Methods:
- Pregnant rats received vehicle (CON), low-dose (2.5 mg/kg), or high-dose (5.0 mg/kg) haloperidol (HAL) from gestational day 6 to 20.
- Offspring were evaluated using five behavioral measures: milk-induced activation (PND 6), shock-precipitated wall climbing (PNDs 9-17), amphetamine and apomorphine-induced stereotypies (PND 30), and barbiturate anesthesia duration (PNDs 34, 62).
Main Results:
- Prenatal HAL exposure led to reduced arousal and increased inactivity in pups on postnatal day 6.
- Shock-precipitated wall climbing was reduced in HAL-exposed rats early in life (PNDs 9, 11) but not later.
- At PND 62, high-dose HAL exposure significantly reduced barbiturate anesthesia duration in both male and female rats.
Conclusions:
- Prenatal haloperidol exposure induces transient early-life behavioral alterations in rat offspring, characterized by reduced arousal.
- These early effects appear to wane with age, indicating a dynamic developmental trajectory.
- Later in development, significant alterations in response to anesthetics suggest potential long-term neurochemical or physiological changes.