Alternative ligands for thyroid hormone receptors

Area of Science:

• Endocrinology
• Molecular Biology
• Genetics

Background:

• Thyroid hormone receptors (TRs) are crucial ligand-dependent transcription factors.
• TRs regulate diverse physiological processes by activating or repressing gene transcription.
• 3,3',5-L-triiodothyronine is the primary cognate ligand for TRs.

Purpose of the Study:

• To review current knowledge on alternative ligands binding to TRs.
• To discuss the molecular interactions between TRs and various ligands.
• To highlight the role of these interactions in thyroid hormone signaling and therapeutic development.

Main Methods:

• Literature review of studies on TR-ligand interactions.
• Analysis of research on endogenous and synthetic TR ligands.
• Examination of molecular mechanisms of TR activation and gene regulation.

Main Results:

• TRs can be activated by alternative ligands beyond 3,3',5-L-triiodothyronine.
• Endogenous molecules like 3,5-diiodo-L-thyronine and 3,5,3'-triiodothyroacetic acid modulate TR activity.
• Synthetic thyromimetics and endocrine disruptors reveal specific TR isoform interactions and binding site residues.

Conclusions:

• Alternative ligands induce diverse TR conformations, influencing thyroid hormone signaling.
• Understanding TR-ligand interactions is key for developing targeted therapies for thyroid disorders.
• Ligand design can achieve tissue-specific regulation of TR activity.