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08 November 2017 : Laboratory Research  

BRAFV600E and RET/PTC Promote Proliferation and Migration of Papillary Thyroid Carcinoma Cells In Vitro by Regulating Nuclear Factor-κB

Dehua Zhou1AG, Zhou Li2BCDEF*, Xuefeng Bai3BCDEF

DOI: 10.12659/MSM.904928

Med Sci Monit 2017; 23:5321-5329

Abstract

BACKGROUND: Papillary thyroid carcinoma (PTC) is associated with mutations of BRAFV600E and RET/PTC and high levels of expression of nuclear factor-κB (NF-κB). However, few studies have focused on the association between NF-κB expression and mutations in BRAFV600E and RET/PTC, especially regarding PTC cell proliferation and migration. The aim of this in vitro study was to investigate the effect of BRAFV600E or RET/PTC on NF-κB expression, cell proliferation and cell migration in four established PTC cell lines.

MATERIAL AND METHODS: Four cell lines included TPC-1 (BRAFWT/WT), BCPAP (BRAFV600E/V600E), PCCL3, and PTC3-5 (RET/PTC), were grown in culture in vitro with or without suppression of NF-κB using pyrrolidine dithiocarbamate (PDTC), and cell proliferation, and cell migration were evaluated.

RESULTS: Expression of the BRAF gene was increased in the BCPAP cell line when compared with the TPC-1 cells. Expression of the RET gene was increased in the PTC3-5 cell line when compared with the PCCL3 cells. In the BCPAP and PTC3-5 cell lines, the relative expression of NF-κB protein, including phosphorylated p100/52, phosphorylated p65, phosphorylated IKKa/b, phosphorylated IκBα, and p65 nuclear translocation were increased compared with the TPC-1 and PCCL3 cells. Proliferation and migration of BCPAP and PTC3-5 cells were increased compared with the TPC-1 and PCCL3 cells. Suppression of NF-κB reduced NF-κB protein expression and inhibited the proliferation of cells in the TPC-1, BCPAP, PCCL3 and PTC3-5 cell lines, and migration of the BCPAP and PTC3-5 cells.

CONCLUSIONS: BRAFV600E and RET/PTC and the expression of NF-κB promote the proliferation and migration of papillary thyroid carcinoma cells in vitro.

Keywords: Protein Modification, Translational, Receptor Activator of Nuclear Factor-kappa B

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750