Abstract
Long non-coding RNAs (lncRNAs) participate in transcription and in epigenetic or post-transcriptional regulation of gene expression. They also have roles in epithelial to mesenchymal transition and in carcinogenesis. Because lncRNAs may also have a role in thyroid cancer progression, we examined a group of thyroid tumors which included papillary thyroid carcinomas and anaplastic thyroid carcinomas to determine the specific lncRNAs that were upregulated during thyroid tumor progression. An RT2 Profiler PCR Array Human Cancer Pathway Finder consisting of 84 lncRNAs (Qiagen) and fresh tissues of normal thyroid, PTCs, and ATCs with gene expression profiling was used to determine genes upregulated and downregulated in ATCs. Two of the most highly upregulated genes, prostate cancer antigen 3 (PCA3) and HOX antisense intergenic RNA myeloid 1 (HOTAIRM1 or HAM-1), were selected for further studies using a thyroid tissue microarray(TMA) with formalin-fixed paraffin-embedded tissues of normal thyroid (NT, n = 10), nodular goiters (NG, n = 10), follicular adenoma (FA, n = 32), follicular carcinoma (FCA, n = 28), papillary thyroid carcinoma (PTC, n = 28), follicular variant of papillary thyroid carcinoma (FVPTC, n = 28), and anaplastic thyroid carcinoma (ATC, n = 10). TMA sections were analyzed by in situ hybridization (ISH) using RNAscope technology. The results of ISH analyses were imaged with Vectra imaging technology and quantified with Nuance® and inForm® software. The TMA analysis was validated by qRT-PCR using FFPE tissues for RNA preparation. Cultured thyroid carcinoma cell lines (n = 7) were also used to analyze for lncRNAs by qRT-PCR. The results showed 11 lncRNAs upregulated and 7 downregulated lncRNAs more than twofold in the ATCS compared with PTCs. Two of the upregulated lncRNAs, PCA3 and HAM-1, were analyzed on a thyroid carcinoma TMA. There was increased expression of both lncRNAs in ATCs and PTCs compared with NT after TMA analysis. qRT-PCR analyses showed increased expression of both lncRNAs in ATCs compared with NT and PTCs. Analyses of these lncRNAs from cultured thyroid carcinoma cell lines by qRT-PCR showed the highest levels of lncRNA expression in ATCs. TGF-β treatment of cultured PTC and ATC cells for 21 days led to increased expression of PCA3 lncRNA in both cell lines by day 14. These results show that the lncRNAs PCA3 and HAM-1 are upregulated during thyroid tumor development and progression and may function as oncogenes during tumor progression.
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Acknowledgements
We kindly thank Dr. John A. Copland III (Mayo Clinic, Jacksonville, FL) for the THJ-16T cell line, Dr. Rebecca E. Schweppe (University of Colorado, Denver, CO) for the BCPAP cell line, Dr. Daniel T. Ruan (Brigham and Women’s Hospital, Boston, MA) for the TPC-1 cell line, and the staff of the Translational Research Initiatives in Pathology (TRIP) Laboratory for technical assistance.
Funding
Dr. Y. Wang received a research grant from the Department of Pathology and Laboratory Medicine at the University of Wisconsin School of Medicine and Public Health.
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Wang, Y., Hardin, H., Chu, YH. et al. Long Non-coding RNA Expression in Anaplastic Thyroid Carcinomas. Endocr Pathol 30, 262–269 (2019). https://doi.org/10.1007/s12022-019-09589-y
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DOI: https://doi.org/10.1007/s12022-019-09589-y