Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of human thyrocytes stably expressing wild type RET/PTC1 oncogene or RET/PTC1 carrying Y451F mutation and parental thyrocytes

ABSTRACT: Mass populations of thyrocytes stably expressing wild type RET/PTC1 oncogene or RET/PTC1 carrying Y451F mutation and parental thyrocytes were used for hybridization on Affymetrix HG-U133A and HG-U133B chips. For each cell condition were generated two different targets (indicated as two different samples in the database, i.e. "Parental Thyrocytes" and "Parental Thyrocytes bis")for a total number of six samples. For the data analysis the two samples from the same condition (i.e. Parental thyrocytes) were considered as duplicates.

ORGANISM(S): Homo sapiens

SUBMITTER: C Ferrario

PROVIDER: E-MEXP-429 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Induction of a proinflammatory program in normal human thyrocytes by the RET/PTC1 oncogene.

Borrello Maria Grazia MG Alberti Luisella L Fischer Andrew A Degl'innocenti Debora D Ferrario Cristina C Gariboldi Manuela M Marchesi Federica F Allavena Paola P Greco Angela A Collini Paola P Pilotti Silvana S Cassinelli Giuliana G Bressan Paola P Fugazzola Laura L Mantovani Alberto A Pierotti Marco A MA

Proceedings of the National Academy of Sciences of the United States of America 20051003 41

Rearrangements of the RET receptor tyrosine kinase gene generating RET/PTC oncogenes are specific to papillary thyroid carcinoma (PTC), the most frequent thyroid tumor. Here, we show that the RET/PTC1 oncogene, when exogenously expressed in primary normal human thyrocytes, induces the expression of a large set of genes involved in inflammation and tumor invasion, including those encoding chemokines (CCL2, CCL20, CXCL8, and CXCL12), chemokine receptors (CXCR4), cytokines (IL1B, CSF-1, GM-CSF, and ...[more]

PMID: 16203990

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Project description:Genomic rearrangements leading to intragenic gene fusion are mainly found in some types of haematopoietic malignancies and sarcomas. Recently they have been described also in carcinomas such as the papillary thyroid histotype (60%-70%) and the Hürthle thyroid tumours (58%). The presence of junction oncogene constitutes an area of exciting research for emerging therapy as targeting the RET-PTC1 fusion oncogene by using small interfering RNA (siRNA) strategies since it is present only in the tumour cells and not in the surrounding normal cells. Therefore, we developed a siRNA against RET-PTC1 junction and assess its efficiency on the human papillary thyroid carcinoma cell line TPC-1 which spontaneously harbours the RET-PTC1 oncogene. The targeted genes are assessed by microarray analysis by comparing the regulated genes by the siRNA_RET-PTC1 vs a siRNA_RET developed on the RET part of the mRNA minus the siRNA_control that contain four mutation within the RET-PTC1 sequence. To test the targeted genes in the TPC-1 cell line that spontaneously harbours RET-PTC1 junction of two siRNAs developed: Within the RET-PTC1 junction, and in the mRNA RET part. A non-specific siRNA harbouring 4 mutations within the RET-PTC1 sequence was used as negative control (siRNA_control). By real-time PCR (Q-RT-PCR) we demonstrated that both siRNAs (siRNA_RET-PTC1 and siRNA_RET) significantly reduce RET mRNA levels of about 85 % in TPC-1 cells. The negative control did not show an effect of RET mRNA levels. Three independent transfections were performed on TPC-1 cells using 5 µl of Lipofectamine 2000 transfection reagent (Invitrogen, Cergy-Pontoise, France) and 50nM of i) siRNA_RET-PTC1 or ii) siRNA_RET or iii) siRNA_control that harbour 4 mutations within its sequence. Total RNAs of untreated cells and transfected cells were purified using the RNA cleanup and concentration kit (QIAGEN, Hilden, Germany) and gathered in 4 pools : 1) TPC-1 harbouring RET-PTC1 ; 2) TPC-1 silenced for RET-PTC1 with siRNA RET-PTC1 ; 3) TPC-1 silenced for siRNA RET ; 4) TPC-1 treated with the siRNA control.

Project description:Radiation is an established cause of thyroid cancer and growing evidence supports a role for H2O2 in spontaneous thyroid carcinogenesis. Little is known about the molecular programs activated by these agents in thyroid cells. We profiled the DNA damage response and cell death induced by M-NM-3-radiation (0.1M-bM-^@M-^S5Gy) and H2O2 (0.0025M-bM-^@M-^S0.3mM) in primary human thyroid cells and T-cells. While the two cell types had more comparable radiation responses, 3- to 10-fold more H2O2 was needed to induce detectable DNA damage in thyrocytes. At H2O2 and radiation doses incurring double-strand breaks (DSB), cell death occurred after 24hrs in T-cells, but not in thyrocytes. We next prepared thyroid and T-cells primary cultures from 8 donors operated for non-cancerous pathologies and profiled their genome-wide transcriptional response 4hr after: 1) exposure to 1 Gy radiation, 2) treatment with H2O2, or 3) no treatment. Two H2O2 doses were investigated, calibrated in each cell type as to elicit levels of single- and double-strand breaks equivalent to 1 Gy M-NM-3-radiation. The transcriptional responses of thyrocyte and T-cells to radiation were similar, involving DNA repair and cell death genes. In addition to this transcriptional program, H2O2 also upregulated antioxidant genes in thyrocytes, including glutathione peroxidases (GPx) at the DSB-inducing dose. By contrast, a transcriptional storm involving thousands of genes was raised in T-cells. Finally, we showed that GPx inhibition reduced the DNA damaging effect of H2O2 in thyrocytes. We conjecture that defects of anti- H2O2 protection could promote spontaneous thyroid cancers. Here we characterize the response of thyrocytes to H2O2 from the perspective of DNA damage (SSB and DSB), cell death and genome-wide transcription. We adopted a dual comparative set up. First, in order to gain preliminary insights about which effects are specific to thyrocytes, all experiments were run in parallel in T-cells. Second, all experiments were replicated with radiation, providing a comparison with a proven etiological agent of PTCs. Hence, we investigated all 4 combinations of two factors: thyrocytes vs. T-cells and H2O2 vs. radiation. Cell lines divide indefinitively owning to basic dysfunctions of cell cycle controls. These have the potential to distort the stress response, DNA repair and cell death in particular. Hence, we worked exclusively on human primary cultures. The radiation and presumably also the H2O2 responses vary among individuals. We seek to average out individual effects by replicating the microarray experiments across the matched T-cells and thyrocytes of 8 donors.

Dataset Information

Transcription profiling of human thyrocytes stably expressing wild type RET/PTC1 oncogene or RET/PTC1 carrying Y451F mutation and parental thyrocytes

Publications

Induction of a proinflammatory program in normal human thyrocytes by the RET/PTC1 oncogene.

Similar Datasets

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