Target intelligence / Profile preview

Thyroid Hormone Receptor (TR)

Target: TR
Molecular classification: Nuclear receptor, Transcription factor, Hormone receptor

Overview

The thyroid hormone receptor (TR) is a nuclear receptor that mediates the effects of thyroid hormones (T3 and T4) by regulating gene expression. It plays a crucial role in development, growth, and metabolism. TRs exist as different isoforms (TRα1, TRα2, TRβ1, and TRβ2) encoded by two genes (THRA and THRB). TRs bind to specific DNA sequences called thyroid hormone response elements (TREs) and, upon ligand binding, recruit coactivators to activate transcription. Dysregulation of TR function is implicated in various diseases.

Other names: Nuclear receptor subfamily 1, group I, member 1 (NR1I1)c-ErbA proto-oncogeneThyroid hormone nuclear receptor

Mechanism of action

Ligand-dependent and independent modulation of gene expression via binding to thyroid hormone response elements (TREs) on DNA, recruitment of coactivators or corepressors.

Biological functions

Transcriptional regulationRegulation of gene expressionModulation of metabolismRegulation of developmentRegulation of growthLigand-dependent signaling

Disease associations

Thyroid hormone resistance syndromesHypothyroidismHyperthyroidismDevelopmental abnormalitiesCardiovascular diseaseMetabolic disordersCancer (role varies depending on context)

Safety considerations

Hyperthyroidism (due to excessive thyroid hormone action)Cardiac arrhythmias (in susceptible individuals with excessive thyroid hormone)Bone loss (with long-term excessive thyroid hormone)Drug interactions (with medications affecting thyroid hormone metabolism or binding)Potential for teratogenic effects (during pregnancy)

Interacting drugs

Triiodothyronine (T3)

4 more in the full profile.

Biomarkers

T3 and T4 levels (for assessing thyroid function)TSH levels (indirect measure of thyroid hormone action)TR mutations (in thyroid hormone resistance syndromes)Expression levels of TR target genes (in specific tissues)

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