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Altered maternal thyroid function: fetal and neonatal development of rat
1Department of Endocrinology and Metabolism, Defence Institute of Physiology and Allied Sciences, Delhi Cantt.
Insights
Maternal thyroid hormones significantly impact fetal development. Hypothyroidism in mothers led to growth issues and high offspring mortality, while hyperthyroidism resulted in larger fetuses.
Area of Science:
- Endocrinology
- Developmental Biology
- Reproductive Science
Background:
- Maternal thyroid hormones are crucial for fetal and neonatal development.
- Disruptions in maternal thyroid status can lead to adverse outcomes in offspring.
Purpose of the Study:
- To investigate the influence of maternal hypothyroidism and hyperthyroidism on fetal and neonatal development in rats.
- To assess the impact of altered maternal thyroid function on offspring growth, survival, and physiological parameters.
Main Methods:
- Induction of maternal hypothyroidism and hyperthyroidism in a rat model.
- Evaluation of reproductive parameters, including offspring body weight, heart weight, body length, and tail length.
- Monitoring of offspring mortality rates and plasma thyroxine levels in fetuses.
Main Results:
- Maternal hypothyroidism caused impaired reproduction and intrauterine growth retardation, evidenced by reduced offspring size and high neonatal mortality.
- Offspring from hypothyroid mothers did not survive beyond eight days.
- Maternal hyperthyroidism did not impair reproduction but led to increased fetal body and heart weight.
- Fetal plasma thyroxine was undetectable until day 21 of gestation in hypothyroid dams.
Conclusions:
- Maternal thyroid status is a critical determinant of successful fetal and neonatal growth and development in rats.
- Thyroid hormone deficiency during gestation poses a significant risk to offspring viability.
- Further research is warranted to elucidate the precise mechanisms underlying these effects.
Abstract:
Influence of maternal thyroid status on fetal and neonatal development of rats has been studied. Maternal hypothyroidism resulted impaired reproduction and intrauterine growth retardation of offsprings as revealed by their reduced body weight, heart weight, body length and tail length. Offsprings born to hypothyroid mothers showed very high rate of mortality and none of them survived beyond eight days. Maternal hyperthyroidism did not cause any abnormality on reproduction. Hyperthyroid mothers showed increased rate in body weight gain during pregnancy which was associated with increased weight of body and heart of fetuses born to hyperthyroid mothers. Plasma thyroxine was not measurable in fetus from hypothyroid mothers till 21st day of gestation. The results of the present study showed that maternal thyroid status plays an important role in fetal and neonatal growth and development.