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Moderate Prenatal Alcohol Exposure and Quantification of Social Behavior in Adult Rats
Published on: December 14, 2014
The effects of low-moderate dose prenatal ethanol exposure on the fetal and postnatal rat lung
M E Probyn1, J S M Cuffe1, S Zanini1
1School of Biomedical Sciences, Faculty of Science, The University of Queensland, St Lucia, Australia.
Insights
Prenatal alcohol exposure in rats led to lung fibrosis in males, impacting respiratory function. This study highlights potential long-term pulmonary consequences of low-moderate ethanol exposure during development.
Area of Science:
- Developmental Biology
- Pulmonology
- Toxicology
Background:
- Prenatal exposure to ethanol (EtOH) can affect fetal development, but its impact on lung development and function remains unclear.
- Understanding these effects is crucial for assessing long-term health risks associated with maternal alcohol consumption.
Purpose of the Study:
- To investigate the effects of chronic low-moderate prenatal ethanol exposure on fetal and postnatal lung structure and function in Sprague-Dawley rats.
- To identify specific molecular and structural changes in the lung resulting from gestational alcohol exposure.
Main Methods:
- Sprague-Dawley rats were administered a liquid diet with or without 6% ethanol throughout gestation.
- Pulmonary tissues were analyzed at embryonic day 20, postnatal day 1, and at 8, 10, and 19 months of age.
- Gene and protein expression (aquaporin 5, epithelial sodium channel, surfactant proteins, collagen), airspace percentage, and alveolar size were assessed.
Main Results:
- At embryonic day 20, ethanol-exposed fetuses showed decreased aquaporin 5 mRNA levels.
- No significant differences in airspace percentage or alveolar diameter were observed at postnatal day 1.
- Male offspring exposed to ethanol exhibited upregulated collagen type III α1 gene expression at 8 months, increased collagen deposition at 10 months, and a 25% reduction in surfactant protein B levels at 19 months.
Conclusions:
- Chronic low-moderate prenatal ethanol exposure in male rats may lead to pulmonary fibrosis.
- These findings suggest potential long-term impairment of lung function and reduced respiratory capacity due to prenatal alcohol exposure.
Abstract:
Little is known about whether exposure of the fetus to alcohol alters pulmonary development or function. This study aimed to determine whether low-moderate ethanol (EtOH) exposure throughout gestation alters structural and non-respiratory functional aspects of the fetal and postnatal lung. Sprague-Dawley rats were fed an ad libitum liquid diet ±6% v/v EtOH daily throughout pregnancy, achieving a plasma ethanol (EtOH) concentration of 0.03%. Gene and protein expression was determined in pulmonary tissue collected from fetuses at embryonic day (E) 20 and adult offspring. The percentage of airspace and alveolar size was measured in pulmonary tissue collected at postnatal day (PN) 1. At E20, EtOH-exposed fetuses had decreased aquaporin 5 mRNA levels and a non-significant trend for decreased epithelial sodium channel type α; expression of other pulmonary fluid homeostatic and development genes and surfactant protein genes were not different between groups. At PN1, there was no difference between EtOH-exposed and control offspring in the distal airspace percentage or diameter. At 8 months, collagen type III α1 gene expression was upregulated in EtOH-exposed male offspring; this was associated with increased collagen deposition at 10 months. At 19 months, male EtOH-exposed offspring had a 25% reduction in the protein levels of surfactant protein B. The alterations observed in male EtOH-exposed offspring suggest chronic low-moderate prenatal EtOH-exposure during development may result in increased pulmonary fibrosis. Such an alteration would decrease the respiratory capacity of the lung.
