Induction of sodium iodide symporter gene and molecular characterisation of HNF3β/FoxA2, TTF-1 and C/EBPβ in thyroid carcinoma cells

T. Akagi, Q. T. Luong, Dorina Gui, J. Said, J. Selektar, A. Yung, C. M. Bunce, G. D. Braunstein, H. P. Koeffler

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Thyroid carcinoma cells often do not express thyroid-specific genes including sodium iodide symporter (NIS), thyroperoxidase (TPO), thyroglobulin (TG), and thyrotropin-stimulating hormone receptor (TSHR). Treatment of thyroid carcinoma cells (four papillary and two anaplastic cell lines) with histone deacetylase inhibitors (SAHA or VPA) modestly induced the expression of the NIS gene. The promoter regions of the thyroid-specific genes contained binding sites for hepatocyte nuclear factor 3 β (HNF3β)/forkhead box A2 (FoxA2), thyroid transcription factor 1 (TTF-1), and CCAAT/enhancer binding protein β (C/EBPβ). Quantitative reverse transcription-polymerase chain reaction (RT-PCR) showed decreased expression of HNF3β/FoxA2 and TTF-1 mRNA in papillary thyroid carcinoma cell lines, when compared with normal thyroid cells. Forced expression of these genes in papillary thyroid carcinoma cells inhibited their growth. Furthermore, the CpG island in the promoter region of HNF3β/FoxA2 was aberrantly methylated; and treatment with 5-aza-2-deoxycytidine (5-Az) induced its expression. Immunohistochemical staining showed that C/EBPβ was localised in the nucleus in normal thyroid cells but was detected in the cytoplasm in papillary thyroid carcinoma cells. Subcellular fractionation of papillary thyroid carcinoma cell lines also demonstrated high levels of expression of C/EBPβ in the cytoplasm, suggesting that a large proportion of C/EBPβ protein is inappropriately localised in the cytoplasm. In summary, these findings reveal novel abnormalities in thyroid carcinoma cells.

Original languageEnglish (US)
Pages (from-to)781-788
Number of pages8
JournalBritish Journal of Cancer
Volume99
Issue number5
DOIs
StatePublished - Sep 2 2008
Externally publishedYes

Fingerprint

Hepatocyte Nuclear Factors
CCAAT-Enhancer-Binding Proteins
Thyroid Neoplasms
varespladib methyl
Thyroid Gland
Genes
Cytoplasm
decitabine
Genetic Promoter Regions
Cell Line
Gene Expression
CpG Islands
Histone Deacetylase Inhibitors
Thyroglobulin
Thyrotropin
thyroid nuclear factor 1
sodium-iodide symporter
Reverse Transcription
Binding Sites
Hormones

Keywords

  • Anaplastic
  • C/EBPβ
  • HNF3β/FoxA2
  • Papillary
  • Thyroid cancer

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Induction of sodium iodide symporter gene and molecular characterisation of HNF3β/FoxA2, TTF-1 and C/EBPβ in thyroid carcinoma cells. / Akagi, T.; Luong, Q. T.; Gui, Dorina; Said, J.; Selektar, J.; Yung, A.; Bunce, C. M.; Braunstein, G. D.; Koeffler, H. P.

In: British Journal of Cancer, Vol. 99, No. 5, 02.09.2008, p. 781-788.

Research output: Contribution to journalArticle

Akagi, T. ; Luong, Q. T. ; Gui, Dorina ; Said, J. ; Selektar, J. ; Yung, A. ; Bunce, C. M. ; Braunstein, G. D. ; Koeffler, H. P. / Induction of sodium iodide symporter gene and molecular characterisation of HNF3β/FoxA2, TTF-1 and C/EBPβ in thyroid carcinoma cells. In: British Journal of Cancer. 2008 ; Vol. 99, No. 5. pp. 781-788.
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abstract = "Thyroid carcinoma cells often do not express thyroid-specific genes including sodium iodide symporter (NIS), thyroperoxidase (TPO), thyroglobulin (TG), and thyrotropin-stimulating hormone receptor (TSHR). Treatment of thyroid carcinoma cells (four papillary and two anaplastic cell lines) with histone deacetylase inhibitors (SAHA or VPA) modestly induced the expression of the NIS gene. The promoter regions of the thyroid-specific genes contained binding sites for hepatocyte nuclear factor 3 β (HNF3β)/forkhead box A2 (FoxA2), thyroid transcription factor 1 (TTF-1), and CCAAT/enhancer binding protein β (C/EBPβ). Quantitative reverse transcription-polymerase chain reaction (RT-PCR) showed decreased expression of HNF3β/FoxA2 and TTF-1 mRNA in papillary thyroid carcinoma cell lines, when compared with normal thyroid cells. Forced expression of these genes in papillary thyroid carcinoma cells inhibited their growth. Furthermore, the CpG island in the promoter region of HNF3β/FoxA2 was aberrantly methylated; and treatment with 5-aza-2-deoxycytidine (5-Az) induced its expression. Immunohistochemical staining showed that C/EBPβ was localised in the nucleus in normal thyroid cells but was detected in the cytoplasm in papillary thyroid carcinoma cells. Subcellular fractionation of papillary thyroid carcinoma cell lines also demonstrated high levels of expression of C/EBPβ in the cytoplasm, suggesting that a large proportion of C/EBPβ protein is inappropriately localised in the cytoplasm. In summary, these findings reveal novel abnormalities in thyroid carcinoma cells.",
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AU - Gui, Dorina

AU - Said, J.

AU - Selektar, J.

AU - Yung, A.

AU - Bunce, C. M.

AU - Braunstein, G. D.

AU - Koeffler, H. P.

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