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Differentially expression profiling in a brain metastasis of a papillary thyroid carcinoma and its technical replicate vs. non-brain metastatic papillary thyroid carcinomas, and primary brain tumors

ABSTRACT: Experiment: Establishment of expression profiles in a brain metastasis from a PTC (RNA processing and hybridization to Affymetrix microarray done twice to yield a technical replicate), in non-brain metastatic, stage III and IV PTCs, and primary brain tumors. Biostatistics analysis identified genes and biofunctions related to the brain metastatic PTC.

ORGANISM(S): Homo sapiens

PROVIDER: GSE66463 | GEO | 2016/11/01

SECONDARY ACCESSION(S): PRJNA277017

REPOSITORIES: GEO

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Differentially expression profiling in Hashimoto's thyroiditis (HT), papillary thyroid carcinoma (PTC) with HT in background, PTC without HT in background, micro PTC (mPTC), and three normal thyroid samples (TN).

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2005-02-28 | E-TABM-68 | biostudies-arrayexpress

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Project description:Mice with thyroid-specific expression of oncogenic BRAF (Tg-Braf) develop papillary thyroid cancers (PTC) that are locally invasive and have well-defined foci of poorly differentiated thyroid carcinoma (PDTC). To investigate the PTC-PDTC progression, we performed a microarray analysis using RNA from paired samples of PDTC and PTC collected from the same animals by laser capture microdissection. Analysis of 8 paired samples revealed a profound deregulation of genes involved in cell adhesion and intracellular junctions, with changes consistent with an epithelial-mesenchymal transition (EMT). This was confirmed by IHC, as vimentin expression was increased and E-cadherin lost in PDTC compared to adjacent PTC. Moreover, PDTC stained positively for phospho-Smad2, suggesting a role for transforming growth factor-beta (TGFbeta) in mediating this process. Accordingly, TGFbeta induced EMT in primary cultures of thyroid cells from Tg-Braf mice, whereas wild-type thyroid cells retained their epithelial features. TGFbeta-induced Smad2 phosphorylation, transcriptional activity and induction of EMT required MAPK pathway activation in Tg-Braf thyrocytes. Hence, tumor initiation by oncogenic BRAF renders thyroid cells susceptible to TGFbeta-induced EMT, through a MAPK-dependent process. Comparing the transcription profiles of 8 pairs of murine poorly differentiated thyroid cancer and papillary thyroid cancer collected from the same animals by laser capture microdissection. Co-hybridizations were done in triplicate with a single dye flip.

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Gene and miRNA expression in radioiodine refractory and avid papillary thyroid carcinomas (gene expression dataset)

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