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Triiodothyronine receptor complex in developing rat brain and pituitary
1Instituto de Investigaciones Biomédicas, Madrid, Spain.
The American Journal of Physiology
|May 1, 1993
Summary
Thyroid hormone (T3) receptors and levels increase significantly in rat brain and pituitary nuclei during development. This suggests T3 plays a crucial role in the differentiation and development of these critical cells.
Area of Science:
- Neuroscience
- Endocrinology
- Developmental Biology
Background:
- Thyroid hormone (T3) is essential for mammalian development.
- Its role in the central nervous system and pituitary gland development requires further elucidation.
Purpose of the Study:
- To investigate the developmental changes in T3 receptor binding and T3 levels in rat pituitary and cerebrocortical nuclei.
- To understand the role of T3 in perinatal development of these tissues.
Main Methods:
- In vitro saturation analysis was performed on rat pituitary and cerebrocortical nuclei.
- Nuclear T3 quantification was utilized to assess T3 binding parameters.
- Analysis spanned from fetal day 14 to postnatal day 20.
Main Results:
- T3 receptors were detectable in neuronal, glial, and pituitary nuclei during fetal development.
- Receptor concentrations and T3 levels increased significantly, peaking in neonatal life.
- Endogenous T3 receptor occupancy showed a six- to ninefold increase.
Conclusions:
- T3 receptors and T3 are present in pituitary and cerebrocortical nuclei during perinatal development.
- These findings support the hypothesis that T3 is vital for cell differentiation and development in these regions.