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Altered maternal thyroid function: fetal and neonatal heart cholesterol and phospholipids
1Defence Institute of Physiology and Allied Science, Delhi Cantt.
Insights
Maternal thyroid function significantly impacts fetal heart lipid metabolism. Both hyperthyroid and hypothyroid conditions in mothers alter cholesterol and phospholipid levels in offsprings, affecting heart development.
Area of Science:
- Endocrinology
- Developmental Biology
- Cardiovascular Physiology
Background:
- Maternal thyroid hormones are crucial for fetal development.
- Thyroid dysfunction can impact various metabolic processes during pregnancy.
- The specific effects on fetal and neonatal heart lipid profiles are not fully understood.
Purpose of the Study:
- To investigate the influence of maternal thyroid status (hyperthyroidism and hypothyroidism) on fetal and neonatal myocardial cholesterol and phospholipid content in a rat model.
- To elucidate the role of maternal thyroid function in regulating lipid metabolism in the developing heart.
Main Methods:
- Utilized a rat model to induce maternal hyperthyroidism and hypothyroidism.
- Analyzed myocardial cholesterol (total, free, esterified) and phospholipid (phosphatidyl choline, phosphatidyl ethanolamine) content in fetuses and neonates.
- Assessed the incorporation of 3H-acetate into phospholipids to evaluate synthesis rates.
Main Results:
- Hyperthyroid offspring showed decreased total cholesterol and increased esterified cholesterol.
- Hypothyroid offspring exhibited increased total, free, and esterified cholesterol.
- Hypothyroid offspring displayed decreased total phospholipids, phosphatidyl choline, and phosphatidyl ethanolamine, with reduced 3H-acetate incorporation.
- Phospholipid fractions in hyperthyroid offspring were not significantly altered.
Conclusions:
- Maternal thyroid function plays a critical role in regulating cholesterol and phospholipid metabolism in fetal and neonatal hearts.
- Maternal hypothyroidism has a more pronounced negative impact on myocardial phospholipid metabolism than hyperthyroidism.
- These findings highlight the importance of maintaining euthyroid status during pregnancy for normal fetal cardiac lipid development.
Abstract:
The influence of maternal thyroid function on the fetal and neonatal myocardial cholesterol and phospholipid content was studied in rats. Fetuses born to hyperthyroid mothers had decreased total cholesterol and increased esterified cholesterol while offsprings born to hypothyroid mothers had increased total, free and esterified cholesterol during late gestation and/or at term. Phospholipid fractions phosphatidyl choline and phosphatidyl ethanolamine in offsprings born to hyperthyroid mothers were not significantly changed. Offsprings born to hypothyroid mothers had decreased total phospholipids, phosphatidyl choline and phosphatidyl ethanolamine at fetal and neonatal stages. 3H-acetate incorporation in phosphatidyl choline and phosphatidyl ethanolamine was also decreased. Maternal thyroid seems to have important role in the regulation of cholesterol and phospholipid metabolism in fetal and neonatal hearts.