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In utero ethanol exposure decreases rapid eye movement sleep in female Sprague-Dawley rat offspring
L Sylvester1, C M Kapron, C Smith
1Department of Biology, Trent University, 2151 East Bank Drive, ON K9L 1Z8, Peterborough, Canada.
Insights
Prenatal ethanol exposure significantly reduced rapid eye movement (REM) sleep in female rats, but not males. This finding highlights sex-specific effects of fetal alcohol exposure on sleep patterns.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Prenatal ethanol exposure can cause fetal alcohol syndrome (FAS), leading to developmental abnormalities and cognitive deficits.
- Abnormal sleep patterns, particularly altered rapid eye movement (REM) sleep, are observed in individuals with FAS.
- Understanding the specific impact of prenatal ethanol on sleep is crucial for addressing FAS-related neurological issues.
Purpose of the Study:
- To investigate the effects of prenatal ethanol exposure on sleep patterns in a Sprague-Dawley rat model.
- To determine if ethanol exposure during gestation differentially impacts REM sleep in male and female offspring.
- To analyze changes in slow wave sleep and wakefulness in response to prenatal ethanol exposure.
Main Methods:
- Utilized a Sprague-Dawley rat model to study fetal alcohol syndrome.
- Administered ethanol to pregnant dams during critical periods of prenatal development.
- Monitored and quantified sleep stages, including REM sleep, slow wave sleep, and wakefulness, in offspring.
Main Results:
- Female rats exposed to ethanol in utero exhibited a significant reduction in the amount of time spent in REM sleep compared to controls.
- The percentage of REM sleep was nearly halved in ethanol-exposed females versus saline controls (6.9% vs. 11.9%).
- No significant differences in REM sleep duration or percentage were observed between male rats exposed to ethanol and their saline controls, nor between males and females.
Conclusions:
- Prenatal ethanol exposure has a sex-specific impact on sleep architecture, specifically reducing REM sleep in female offspring.
- The findings suggest that the developing brain's response to ethanol during gestation is modulated by sex.
- Further research is warranted to elucidate the mechanisms underlying these sex differences and their long-term consequences on behavior and cognition.
Abstract:
There is substantial evidence to suggest that ethanol exposure during vulnerable periods of prenatal somatic growth results in a number of morphological abnormalities and cognitive deficits in offspring. Amongst the characteristics exhibited by affected individuals are abnormal sleeping patterns, particularly abnormal rapid eye movement (REM) sleep. To better understand how prenatal ethanol exposure specifically affects sleeping patterns in offspring, an animal model of fetal alcohol syndrome was investigated using the Sprague-Dawley rat. Our study demonstrated that the amount of time spent in REM sleep was reduced in female, but not male rats, which were exposed to ethanol in utero as compared to male and female saline controls. Similarly, % REM sleep for female saline control rats was almost twice that of females exposed to ethanol (11. 9 vs. 6.9%). By contrast, ethanol treated and control saline males did not differ on the % REM measure (11.5 vs. 10.4%), nor did they differ from the female saline controls. No differences were observed between males and females or treatment groups in terms of time spent in either slow wave sleep or wakefulness.
