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Electrophysiological and behavioral findings in rats prenatally exposed to alcohol
W M Kaneko1, E P Riley, C L Ehlers
1Department of Neuropharmacology CVN-14, Scripps Research Institute, La Jolla, CA 92037.
Insights
Prenatal ethanol exposure in rats led to increased locomotor activity and delayed auditory event-related potential (ERP) components in the hippocampus. These findings suggest ethanol affects brain development and function.
Area of Science:
- Neuroscience
- Developmental Psychology
- Toxicology
Background:
- Prenatal alcohol exposure is linked to behavioral and electrophysiological abnormalities in human infants.
- The hippocampus is a brain region potentially affected by developmental alcohol exposure.
Purpose of the Study:
- To investigate the impact of prenatal ethanol exposure on locomotor behavior in rats.
- To assess auditory event-related potentials (ERPs) in offspring exposed to ethanol in utero.
Main Methods:
- Pregnant rats were administered liquid diets with or without ethanol.
- Offspring were behaviorally tested for locomotor activity.
- Auditory event-related potentials (ERPs) were recorded in mature offspring.
Main Results:
- Prenatal ethanol-exposed rats exhibited significantly increased locomotor activity during the initial 4 hours of their activity cycle.
- Electrophysiological evaluation revealed significantly longer P1 and N1 ERP component latencies in the hippocampus of exposed rats compared to controls.
Conclusions:
- Prenatal ethanol exposure alters locomotor behavior and auditory processing in rats.
- The hippocampus is a key brain area implicated in the neurodevelopmental effects of prenatal alcohol exposure.
Abstract:
Clinical studies have shown that behavioral and electrophysiological abnormalities occur in some human infants born to alcoholic mothers. The present study used rats to evaluate the effects of prenatal ethanol exposure on locomotor behavior and two paradigms for the generation of auditory event-related potentials (ERPs). Pregnant rats were fed liquid diets, one group received alcohol and the other was a nutritional control. The offspring were allowed to mature prior to the electrophysiological and behavioral testing. Prenatal alcohol exposed rats showed significantly more locomotor behavior in the first 4 hours of their activity cycle than nonethanol exposed rats, although not over a subsequent 8-hour period. Evaluation of the electrophysiological data revealed that the prenatal alcohol exposed group had significantly longer latencies of their P1 and N1 ERP components, in the hippocampus, than the control group. These results support anatomical data suggesting that the hippocampus may be an important area in which to direct further study of what brain mechanisms may be altered by prenatal ethanol exposure in the rat.