Thyroid Hormone Receptor Beta Induces a Tumor-Suppressive Program in Anaplastic Thyroid Cancer

Area of Science:

• Molecular endocrinology
• Cancer biology
• Genomics

Background:

• Thyroid hormone receptor beta (TRβ) is crucial for cellular processes and often downregulated in cancers, correlating with aggressive disease.
• TRβ's role as a tumor suppressor is established, but its specific transcriptome and impact in anaplastic thyroid cancer (ATC) remain unclear.

Purpose of the Study:

• To investigate the TRβ-driven tumor suppression transcriptome in ATC.
• To determine the effect of TRβ restoration on the aggressive phenotype of human ATC cells.

Main Methods:

• Restoration of TRβ expression in the SW1736 human ATC cell line (SW-TRβ).
• Transcriptomic analysis using RNA sequencing to identify gene expression patterns.
• Assessment of phenotypic changes including aggressiveness, cancer stem cell populations, and cell death.

Main Results:

• Restored TRβ expression in SW-TRβ cells reduced aggressiveness, decreased cancer stem cell populations, and induced T3-dependent cell death.
• RNA sequencing revealed TRβ regulates PI3K/AKT and JAK1-STAT1 signaling pathways.
• TRβ activation induced thyroid differentiation markers and promoted proapoptotic pathways.

Conclusions:

• TRβ activation induces a tumor suppression program in ATC cells.
• TRβ signaling, particularly via the JAK1-STAT1 pathway, represents a novel therapeutic strategy for ATC.
• TRβ activation is a promising therapeutic option for various cancers.