The effect of maternal alcohol consumption on the viability and visceral development of the newborn rat
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Maternal alcohol consumption during pregnancy significantly increases newborn rat mortality and decreases body weight. It also reduces total RNA and DNA levels in vital organs, impacting offspring development.
Area of Science:
- Toxicology
- Developmental Biology
- Neuroscience
Background:
- Clinical observations link maternal alcohol use during pregnancy to fetal alcohol syndrome (FAS), characterized by birth defects and developmental issues.
- A controlled experimental model is needed to understand the specific impacts of prenatal alcohol exposure.
Purpose of the Study:
- To investigate the effects of chronic maternal alcohol intake on offspring viability, growth, and organ biochemistry in a rat model.
- To assess alterations in DNA, RNA, and protein levels, as well as DNA synthesis in key organs of newborn rats exposed to alcohol in utero.
Main Methods:
- Pregnant rats underwent chronic oral alcohol administration for approximately 21 weeks, followed by gestation.
- Offspring viability, body weight, and organ biochemical parameters (DNA, RNA, protein, DNA synthesis) were analyzed at 3 days postpartum.
- Control groups included pair-fed (non-alcohol) pups for comparison.
Main Results:
- Prenatal alcohol exposure led to a 30% increase in newborn mortality and reduced body weight in 3-day-old pups.
- Total RNA levels were significantly decreased (10-30%) in the brain, heart, liver, and kidney of alcohol-exposed offspring.
- DNA concentration was significantly lower in the liver, while protein levels showed minor changes in the brain only.
Conclusions:
- Prolonged maternal alcohol intake adversely affects newborn rat viability and growth.
- Prenatal alcohol exposure significantly impacts total RNA concentration in multiple vital organs.
- The study highlights the detrimental effects of maternal alcohol consumption on fetal development and organ biochemistry.
Abstract:
The clinical observations that offspring of pregnant alcoholics are prone to congenital defects and abnormal growth and development (fetal alcohol syndrome) have generated interest in studying this problem in a well-controlled experimental model. Accordingly, in this study, we assessed the effects of long-term maternal alcohol intake on offspring viability and growth as well as the DNA, total RNA, protein levels and DNA synthesis in brain, heart, liver, and kidney of 3-day-old newborn rats. Chronic oral intake of alcohol (mean 21 weeks plus 20 days of gestation) resulted in maternal blood alcohol levels of 67 to over 150 mg percent. There was a significant increase of newborn mortality (30%) and a decrease in their body weight at 3 days in alcohol-exposed compared to pair-fed (non-alcohol) control pups (p less than 0.025). Protein concentration was unchanged in heart, liver, and kidney and was slightly elevated in brain of 3-day-old pups exposed to ethanol in utero. DNA synthesis rates were normal in all four organs, while DNA concentration was significantly lower only in the liver of the alcohol-exposed group (p less than 0.05). In the alcohol group the total RNA levels were significantly depressed by about 10-30 percent (p less than 0.05) in all four organs studied. In conclusion, our studies suggest that prolonged maternal alcohol intake has an adverse effect on newborn rat viability and growth as well as the total RNA and to some extent DNA concentration of vital organs.