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Molecular mechanisms of thyroid hormone action. A physiologic perspective
H L Schwartz1, K A Strait, J H Oppenheimer
1Division of Endocrinology and Metabolism, School of Medicine, University of Minnesota, Minneapolis.
Clinics in Laboratory Medicine
|September 1, 1993
Summary
Thyroid hormone receptors (TRs) regulate gene expression at the nuclear level. Further in vivo studies are essential to understand thyroid hormone action in whole animals.
Area of Science:
- Molecular Endocrinology
- Gene Regulation
- Nuclear Receptors
Background:
- Thyroid hormone exerts major actions at the nuclear level by regulating mRNA levels.
- At least three thyroid hormone receptor (TR) isoforms mediate hormonal effects.
- TRs are part of a large superfamily of transactivating proteins.
Purpose of the Study:
- To investigate the complex interactions of thyroid hormone receptors (TRs) with DNA and other proteins.
- To understand the tissue-specific gradations of thyroid hormone effects.
- To bridge the gap between in vitro findings and in vivo physiological mechanisms.
Main Methods:
- Review of recent studies on TR isoform characterization and function.
- Analysis of molecular interactions between T3-receptor complex, DNA, and other regulatory proteins.
- Emphasis on the need for in vivo studies and transgenic models.
Main Results:
- Thyroid hormone action is primarily mediated by TRs at the nuclear level, regulating gene expression.
- TRs exhibit complex associations with DNA and interact with multiple proteins.
- In vitro studies have revealed potential mechanisms, but in vivo validation is crucial.
Conclusions:
- Understanding TRs' ligand-independent functions and interactions is an active area of research.
- Tissue-specific differences in thyroid hormone effects are influenced by complex molecular interactions.
- Future research should focus on in vivo molecular mechanisms using transgenic models to fully elucidate thyroid hormone biology.