The effect of CDDP and iron chelators for squamous cell carcinoma
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ABSTRACT:
PROVIDER: PRJNA689543 | ENA |
REPOSITORIES: ENA
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Project description:For the purpose of analyzing mechanisms related to the cis-diamminedichloroplatinum (CDDP) resistance in head and neck squamous cell carcinoma (head and neck SCC), we employed a nasal squamous cell carcinoma (nasal SCC) cell line RPMI2650 and its CDDP resistant substrain RPMI2650CR previously described. The identification of the resistance-related microRNA (miR) clusters was conducted between RPMI2650CR and RPMI2650 using microRNA microarray. microRNA expression of parental and CDDP resistant was measured with or without CDDP treatment in duplicate.
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Project description:For the purpose of analyzing mechanisms related to the cis-diamminedichloroplatinum (CDDP) resistance in head and neck squamous cell carcinoma (head and neck SCC), we employed a nasal squamous cell carcinoma (nasal SCC) cell line RPMI2650 and its CDDP resistant substrain RPMI2650CR previously described. The identification of the resistance-related microRNA (miR) clusters was conducted between RPMI2650CR and RPMI2650 using microRNA microarray.
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Project description:The molecular role of iron in gene expression remains poorly characterized. Moreover, the alterations in global gene expression after iron chelation remains unclear and are important to assess for understanding the molecular pathology of iron-depletion and the biological effects of iron chelators. We assessed the effect on whole genome gene expression of two iron chelators (desferrioxamine and Dp44mT). These studies are important for understanding the molecular and cellular effects of iron-depletion.
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Project description:The predictive value of microRNAs for the efficacy of chemoradiation (CRTX) in locally advanced head and neck squamous cell carcinoma (HNSCC) was evaluated. Formalin-fixed, paraffin-embedded tumor material was collected from patients with locally advanced HNSCC treated within the ARO-0401 phase III trial with radiotherapy in combination with either 5-fluorouracil/cisplatin (CDDP-CRTX) or 5-fluorouracil/mitomycin C (MMC-CRTX).
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Project description:Gene expression analysis of SW480 cells treated with inhibitor compounds for 6 hours. Results provide insights into the role of iron in Wnt signalling and demonstrate that iron depletion is the primary mode of actions of these compounds on Wnt pathway. SW480 cells were incubated with 10 mM of compounds (OICR623), control (DMSO) and two known iron chelators (DFO and Deferasirox) for 6 hours. RNA was extracted and cDNA samples isolated from 2-4 independent experiments were hybridized to the Affymetrix GeneChip® Human Gene 1.0 ST array.
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Project description:The plasticity of cancer stem cells (CSCs)/tumor-initiating cells (T-ICs) indicates that multiple CSC/T-IC subpopulations exist within a tumor and multiple oncogenic pathways collaborate to maintain the CSC/T-IC state. Here, we aimed to enrich for T-ICs from clinical ESCC tissues. A chemoresistant human esophageal squamous cell carcinoma (ESCC) patient-derived xenograft model was employed to identify miRNA(s) that contribute to ESCC aggressiveness. We used microarrays to demenstrate the microRNA expression underlying different pretreated conditions. NOG mice bearing subcutaneous tumor xenografts derived from clinical ESCC cells were intraperitoneally treated with CDDP or PBS twice weekly for three weeks. Tumor cells were then isolated and re-inoculated subcutaneously into NOG mice for the next round of treatment. In the 4th round of treatment, the volume of tumors in both CDDP- and PBS-treated groups were approximately the same, suggesting that the cells in CDDP-treated tumors were becoming resistant to CDDP.
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Project description:Iron-deficiency affects 500 million people, yet the molecular role of iron in gene expression remains poorly characterized. Moreover, the alterations in global gene expression after iron chelation remains unclear and are important to assess for understanding the molecular pathology of iron-deficiency and the biological effects of iron chelators. We assessed the effect on whole genome gene expression of two iron chelators (desferrioxamine and 2-hydroxy-1-napthylaldehyde isonicotinoyl hydrazone) that have markedly different permeability properties. Sixteen genes were significantly regulated by both chelators, while a further 50 genes were regulated by either ligand. Most of the genes identified in this study have not been previously described to be iron-regulated and are important for understanding the molecular and cellular effects of iron-deficiency. The MCF-7 cells were incubated with either control medium or this medium containing DFO (250 µM) or 311 (25 µM) for 24 h at 37oC. These concentrations were used since our previous studies demonstrated that under these conditions these chelators lead to up-regulation of iron-responsive genes such as the TfR1 after this incubation time.8 Moreover, the higher concentration of DFO was implemented due to its limited ability to permeate cell membranes. Total RNA was isolated from cells in 1 mL of TRIzol® reagent (Invitrogen). Samples were then prepared and hybridized to the Human Genome U133 Plus 2.0 430 2.0. The human GeneChip® U133 Plus 2.0 consists of greater than 47,000 transcripts and variants from over 38,500 well characterized human genes. On completion of hybridization and washing, microarray chips were scanned with the Affymetrix GeneChip® Scanner 3000 (Affymetrix).
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