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[Placental permeability to thyroxine]
Problemy Endokrinologii
|January 1, 1975
Summary
Maternal and fetal thyroid glands do not exchange thyroxin during prenatal development in rats. This suggests the fetal thyroid gland functions autonomously during pregnancy.
Area of Science:
- Endocrinology
- Developmental Biology
- Nuclear Medicine
Context:
- Investigates maternal-fetal exchange of thyroid hormones.
- Utilizes radioisotopes for tracking molecular transport.
- Focuses on the 18th day of gestation in albino rats.
Purpose:
- To determine if I-131-labelled thyroxin crosses the placental barrier.
- To assess the bidirectional transport of thyroxin between mother and fetus.
- To understand the functional development of the fetal thyroid gland.
Summary:
- Albino rats were administered I-131-labelled thyroxin on the 18th day of pregnancy.
- Blood samples from mothers and fetuses were analyzed using radiological and radiochromatographic methods.
- Results indicated no penetration of thyroxin from mother to fetus or vice versa.
Impact:
- Provides evidence for the autonomous function of the fetal thyroid gland during prenatal development.
- Contributes to understanding thyroid hormone regulation in pregnancy.
- Highlights the placental barrier's role in hormone transport.