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Altered maternal thyroid function: fetal and neonatal myocardial metabolism
1Defence Institute of Physiology & Allied Sciences, Delhi Cantt, India.
Biology of the Neonate
|January 1, 1990
Summary
Maternal thyroid hormones significantly impact fetal and neonatal heart metabolism. Maternal hypothyroidism causes growth issues and altered energy substrate use in offspring, while hyperthyroidism enhances fetal development and metabolism.
Area of Science:
- Endocrinology
- Developmental Biology
- Cardiovascular Physiology
Background:
- Maternal thyroid hormones are crucial for fetal development.
- The specific metabolic effects on the fetal and neonatal heart are not fully understood.
Purpose of the Study:
- To investigate the influence of maternal thyroid status on fetal and neonatal myocardial metabolism in rats.
- To elucidate the roles of thyroid hormones in regulating heart protein, carbohydrate, and lipid metabolism during development.
Main Methods:
- Studied rats with experimentally induced maternal hypothyroidism and hyperthyroidism.
- Analyzed fetal and neonatal offspring for growth, survival rates, and myocardial metabolic parameters.
- Measured heart mitochondrial protein levels, free fatty acid (FFA) oxidation, and glucose oxidation rates.
Main Results:
- Neonates of hypothyroid mothers exhibited growth retardation, reduced survival, decreased heart mitochondrial protein, and impaired FFA and glucose oxidation.
- Offspring of hyperthyroid mothers showed enhanced growth, increased myocardial FFA oxidation, and elevated glucose utilization and glycogen synthesis during fetal stages.
- Maternal thyroid status profoundly altered myocardial substrate utilization in fetuses and neonates.
Conclusions:
- Maternal thyroid hormones are essential regulators of fetal and neonatal myocardial metabolic programming.
- Thyroid dysfunction during pregnancy can lead to significant metabolic derangements in offspring, impacting cardiac function and survival.