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- Title
Brn3a/Pou4f1 Functions as a Tumor Suppressor by Targeting c-MET/STAT3 Signaling in Thyroid Cancer.
- Authors
Seung-Nam Jung; Yea Eun Kang; Gun Ho Lee; Lihua Liu; Chan Oh; Yan Li Jin; Mi Ae Lim; Kyungmin Lee; Taejeong Oh; Ho-Ryun Won; Jae Won Chang; Bon Seok Koo; Jung, Seung-Nam; Kang, Yea Eun; Lee, Gun Ho; Liu, Lihua; Oh, Chan; Jin, Yan Li; Lim, Mi Ae; Lee, Kyungmin
- Abstract
<bold>Background: </bold>Brn3a/Pou4f1 is a class IV POU domain-containing transcription factor and has been found to be expressed in a variety of cancers. However, the mechanism and action of Brn3a in thyroid cancer has not been investigated.<bold>Purpose: </bold>To investigate the role of Brn3a in thyroid cancer progression and its clinical implication.<bold>Methods: </bold>We examined Brn3a expression status in patients with thyroid cancer and analyzed relationships between Brn3a expression and clinicopathological findings using The Cancer Genome Atlas (TCGA) database. For functional in vitro analysis, proliferation, migration, invasion assay, and Western blotting were performed after overexpression or suppression of Brn3a.<bold>Results: </bold>The promoter hypermethylation of Brn3a was found in patients with aggressive thyroid cancer and Brn3a was downregulated in tissues of patients with thyroid cancer. In TCGA database, the low-Brn3a-expression group revealed a more aggressive phenotype, including T stage and extrathyroid extension when compared with the high-Brn3a-expression group. Overexpression of Brn3a suppressed cell migration and invasion via regulation of epithelial-mesenchymal transition (EMT)-associated proteins in thyroid cancer cell lines. Brn3a overexpression also downregulated signal transducer and activator of transcription 3 (STAT3) signaling through suppression of tyrosine-protein kinase Met (c-MET). In contrast, knockdown of Brn3a by small interfering ribonucleic acid (siRNA) significantly increased cell migration and invasion through upregulation of c-MET/STAT3. These results imply that Brn3a suppresses tumor metastasis via c-MET/STAT3 inhibition and EMT suppression in thyroid cancer.<bold>Conclusions: </bold>Our findings show that Brn3a is a potential tumor suppressor that leads to reduced cancer cell migration and invasion in thyroid cancer. Elucidation of the Brn3a-regulated cancer pathways may therefore provide novel therapeutic strategies to control thyroid cancer metastasis.
- Subjects
THYROID cancer; TUMOR suppressor genes; APPLIED sciences; VASCULAR endothelial growth factors; CATENINS; MET receptor; MEDICAL sciences; CALCITONIN; PROTEINS; RESEARCH; THYROID gland tumors; ONCOGENES; RESEARCH methodology; MICROARRAY technology; EVALUATION research; MEDICAL cooperation; CELLULAR signal transduction; CELL motility; COMPARATIVE studies; TRANSFERASES; GENES; GENE expression profiling; CELL lines; CARRIER proteins
- Publication
Journal of Clinical Endocrinology & Metabolism, 2020, Vol 105, Issue 9, p1
- ISSN
0021-972X
- Publication type
journal article
- DOI
10.1210/clinem/dgaa316