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Chronic prenatal ethanol exposure-induced decrease of guinea pig hippocampal CA1 pyramidal cell and cerebellar
Tara N McGoey1, James N Reynolds, James F Brien
1Department of Pharmacology & Toxicology, Faculty of Health Sciences, Queen's University, Kingston, ON K7L 3N6, Canada.
Canadian Journal of Physiology and Pharmacology
|May 31, 2003
Summary
Chronic prenatal ethanol exposure harms developing guinea pig brains, causing significant decreases in hippocampal CA1 pyramidal cells and cerebellar Purkinje cells. These neurodegenerative effects manifest at different times after birth, impacting brain development.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Ethanol (alcohol) is a known teratogen, affecting fetal development.
- The developing brain is particularly vulnerable to ethanol's toxic effects, leading to neurodegeneration in specific regions like the hippocampus and cerebellum.
Purpose of the Study:
- To investigate the hypothesis that chronic prenatal ethanol exposure causes distinct temporal patterns of neurodegeneration.
- Specifically examining the linear density of hippocampal CA1 pyramidal cells and cerebellar Purkinje cells in developing guinea pigs.
Main Methods:
- Timed pregnant guinea pigs were administered ethanol, isocaloric-sucrose, or water throughout gestation.
- Offspring were assessed at various developmental stages: near-term fetus (gestational day 62), neonate (postnatal day 1), and early postnatal life (postnatal days 5 and 12).
- Brain, hippocampal, and cerebellar weights were measured, along with the linear density of specific neuronal populations using cell counting and TUNEL assays for apoptosis.
Main Results:
- Ethanol exposure reduced brain, hippocampal, and cerebellar weights across all studied time points.
- No significant changes in neuronal density were observed in near-term fetuses.
- Significant decreases in hippocampal CA1 pyramidal cell density occurred at postnatal days 1, 5, and 12 (25-30%).
- Cerebellar Purkinje cell density decreased by 30% at postnatal day 12, with evidence of increased apoptosis at postnatal day 5.
Conclusions:
- Chronic prenatal ethanol exposure leads to reduced brain size and differential neurodegeneration in the hippocampus and cerebellum.
- The observed neurotoxic effects on hippocampal and cerebellar neurons exhibit distinct time courses during postnatal development.
- These findings highlight the critical impact of maternal ethanol consumption on fetal brain development and neuronal integrity.
