Abstract
Thyroid hormone receptor α1 (TRα1) mediates the genomic actions of thyroid hormone (T3). The biology of TRα1 in growth and development has been well studied, but the functional role of TRα1 in cancers remains to be elucidated. Analysis of the human thyroid cancer database of The Cancer Genome Atlas (TCGA) showed that THRA gene expression is lost in highly dedifferentiated anaplastic thyroid cancer (ATC). We, therefore, explored the effects of TRα1 on the progression of ATC. We stably expressed TRα1 in two human ATC cell lines, THJ-11T (11T-TRα1 #2, #7, and #8) and THJ-16T (16T-TRα1 #3, #4, and #8) cells. We found that the expressed TRα1 inhibited ATC cell proliferation and induced apoptosis. TCGA data showed that THRA gene expression was best correlated with the paired box gene 8 (PAX8). Consistently, we found that the PAX8 expression was barely detectable in parental 11T and 16T cells. However, PAX8 gene expression was elevated in 11T- and 16T-TRα1-expressing cells at the mRNA and protein levels. Using various molecular analyses, we found that TRα1 directly regulated the expression of the PAX8 gene. Single-cell transcriptomic analyses (scRNA-seq) demonstrated that TRα1 functions as a transcription factor through multiple signaling pathways to suppress tumor growth. Importantly, scRNA-seq analysis showed that TRα1-induced PAX8, via its transcription program, shifts the cell landscape of ATC toward a differentiated state. The present studies suggest that TRα1 is a newly identified regulator of thyroid differentiation and could be considered as a potential therapeutic target to improve the outcome of ATC patients.
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Data availability
scRNA-seq data have been submitted to NCBI GEO. The GEO accession number is GSE235216 for accessing the data.
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Acknowledgements
This research was supported by the Intramural Research Programs of the Center for Cancer Research of the National Cancer Institute, National Institutes of Health. We thank Dr. Michael Kelly and his team for carrying out single-cell RNA sequencing at the Single Cell Analysis Facility, Cancer Research Technology Program, Frederick National Laboratory (Leidos Biomed), NCI. We also thank Joelle Mornini, NIH Library, for manuscript editing assistance.
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Conception and designs were performed by S-YC, EH, WKLD, YJZ and XZ. Development of methodology and acquisition of data were carried out by EH, WKLD, YJZ, XZ, LZ, and YY. Analysis and interpretation of data were performed by EH, WKLD, YJZ, XZ, YY and S-YC. Administrative, technical, or material support were performed by S-YC and LZ.
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Hwang, E., Doolittle, W.K.L., Zhu, Y.J. et al. Thyroid hormone receptor α1: a novel regulator of thyroid cancer cell differentiation. Oncogene 42, 3075–3086 (2023). https://doi.org/10.1038/s41388-023-02815-2
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DOI: https://doi.org/10.1038/s41388-023-02815-2