Investigation of radiosensitivity gene signatures in cancer cell lines
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE51370 | GEO | 2013/10/18
SECONDARY ACCESSION(S): PRJNA222841
REPOSITORIES: GEO
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Project description:Commercially available cell lines derived from Head and Neck Squamous cell carcinoma (HNSCC) were cultured and baseline gene expression values were assayed. We used microarrays to detail the global programme of gene expression underlying differences in radiosensitivity as measured by surviving fraction at 2Gy (SF2) HNSCC Cell lines (n=11) were cultured in standard conditions. RNA was extracted at subconfluence.
2013-10-18 | E-GEOD-51370 | biostudies-arrayexpress
Project description:The search for biomarkers to predict radiosensitivity is important not only to individualize radiotherapy of cancer patients but also to forecast radiation exposure risks. The aim of this study was to devise a machine learning method to stratify radiosensitivity and to investigate its association with copy number variations (CNVs) as markers of sensitivity to ionizing radiation. We used the Affymetrix CytoScan HD microarrays to for CNV estimation. Celluar radiosensitivity was measured by the clonogenic surviving fraction at 2 Gy (SF2).
2023-05-08 | GSE231621 | GEO
Project description:Nasopharyngeal carcinoma is a squamous cell carcinoma arising from the nasopharynx epithelium. So far, there have been no effective biomarkers to predict the radiosensitivity of NPC. Based on miRNA profile screened out from NPC patients with different radiosensitivity, this study was conducted to explore the correlation between serum miRNAs and radiotherapy response in NPC, and to identify biomarkers for predicting the radiosensitivity of NPC.
2020-03-30 | GSE139164 | GEO
Project description:Purpose: Predominant causes of head and neck cancer recurrence after radiotherapy are rapid repopulation, hypoxia, fraction of cancer stem cells and intrinsic radioresistance. Currently, intrinsic radioresistance can only be assessed by ex-vivo colony assays. Besides being time-consuming, colony assays do not identify causes of intrinsic resistance. We aimed to identify a biomarker for intrinsic radioresistance to be used before start of treatment and to reveal biological processes that could be targeted to overcome intrinsic resistance. Experimental design: We analyzed both micro- and messenger RNA expression in a large panel of HNSCC cell lines. Expression was measured on both irradiated and unirradiated samples. Results were validated using modified cell lines and a series of laryngeal cancer patients. Results: MiRs, mRNAs and gene sets that correlated with resistance could be identified from expression data of unirradiated cells. The presence of epithelial to mesenchymal transition (EMT) and low expression of miRs involved in the inhibition of EMT were important radioresistance determinants. This finding was validated in two independent cell line pairs, in which the induction of EMT reduced radiosensitivity. Moreover, low expression of the most important miR (miR-203) was shown to correlate with local disease recurrence after radiotherapy in a series of laryngeal cancer patients. Conclusions: These findings indicate that EMT and low expression of EMT-inhibiting miRs, especially miR-203, measured in pre-treatment material, causes intrinsic radioresistance of HNSCC, which could enable identification and treatment modification of radioresistant tumors.
2016-03-19 | GSE79371 | GEO
Project description:Purpose: Predominant causes of head and neck cancer recurrence after radiotherapy are rapid repopulation, hypoxia, fraction of cancer stem cells and intrinsic radioresistance. Currently, intrinsic radioresistance can only be assessed by ex-vivo colony assays. Besides being time-consuming, colony assays do not identify causes of intrinsic resistance. We aimed to identify a biomarker for intrinsic radioresistance to be used before start of treatment and to reveal biological processes that could be targeted to overcome intrinsic resistance. Experimental design: We analyzed both micro- and messenger RNA expression in a large panel of HNSCC cell lines. Expression was measured on both irradiated and unirradiated samples. Results were validated using modified cell lines and a series of laryngeal cancer patients. Results: MiRs, mRNAs and gene sets that correlated with resistance could be identified from expression data of unirradiated cells. The presence of epithelial to mesenchymal transition (EMT) and low expression of miRs involved in the inhibition of EMT were important radioresistance determinants. This finding was validated in two independent cell line pairs, in which the induction of EMT reduced radiosensitivity. Moreover, low expression of the most important miR (miR-203) was shown to correlate with local disease recurrence after radiotherapy in a series of laryngeal cancer patients. Conclusions: These findings indicate that EMT and low expression of EMT-inhibiting miRs, especially miR-203, measured in pre-treatment material, causes intrinsic radioresistance of HNSCC, which could enable identification and treatment modification of radioresistant tumors.
2016-03-19 | GSE79370 | GEO
Project description:Purpose: Predominant causes of head and neck cancer recurrence after radiotherapy are rapid repopulation, hypoxia, fraction of cancer stem cells and intrinsic radioresistance. Currently, intrinsic radioresistance can only be assessed by ex-vivo colony assays. Besides being time-consuming, colony assays do not identify causes of intrinsic resistance. We aimed to identify a biomarker for intrinsic radioresistance to be used before start of treatment and to reveal biological processes that could be targeted to overcome intrinsic resistance. Experimental design: We analyzed both micro- and messenger RNA expression in a large panel of HNSCC cell lines. Expression was measured on both irradiated and unirradiated samples. Results were validated using modified cell lines and a series of laryngeal cancer patients. Results: MiRs, mRNAs and gene sets that correlated with resistance could be identified from expression data of unirradiated cells. The presence of epithelial to mesenchymal transition (EMT) and low expression of miRs involved in the inhibition of EMT were important radioresistance determinants. This finding was validated in two independent cell line pairs, in which the induction of EMT reduced radiosensitivity. Moreover, low expression of the most important miR (miR-203) was shown to correlate with local disease recurrence after radiotherapy in a series of laryngeal cancer patients. Conclusions: These findings indicate that EMT and low expression of EMT-inhibiting miRs, especially miR-203, measured in pre-treatment material, causes intrinsic radioresistance of HNSCC, which could enable identification and treatment modification of radioresistant tumors.
2016-03-19 | GSE79368 | GEO
Project description:Purpose: Predominant causes of head and neck cancer recurrence after radiotherapy are rapid repopulation, hypoxia, fraction of cancer stem cells and intrinsic radioresistance. Currently, intrinsic radioresistance can only be assessed by ex-vivo colony assays. Besides being time-consuming, colony assays do not identify causes of intrinsic resistance. We aimed to identify a biomarker for intrinsic radioresistance to be used before start of treatment and to reveal biological processes that could be targeted to overcome intrinsic resistance. Experimental design: We analyzed both micro- and messenger RNA expression in a large panel of HNSCC cell lines. Expression was measured on both irradiated and unirradiated samples. Results were validated using modified cell lines and a series of laryngeal cancer patients. Results: MiRs, mRNAs and gene sets that correlated with resistance could be identified from expression data of unirradiated cells. The presence of epithelial to mesenchymal transition (EMT) and low expression of miRs involved in the inhibition of EMT were important radioresistance determinants. This finding was validated in two independent cell line pairs, in which the induction of EMT reduced radiosensitivity. Moreover, low expression of the most important miR (miR-203) was shown to correlate with local disease recurrence after radiotherapy in a series of laryngeal cancer patients. Conclusions: These findings indicate that EMT and low expression of EMT-inhibiting miRs, especially miR-203, measured in pre-treatment material, causes intrinsic radioresistance of HNSCC, which could enable identification and treatment modification of radioresistant tumors.
2016-03-19 | GSE79369 | GEO
Project description:Purpose: Predominant causes of head and neck cancer recurrence after radiotherapy are rapid repopulation, hypoxia, fraction of cancer stem cells and intrinsic radioresistance. Currently, intrinsic radioresistance can only be assessed by ex-vivo colony assays. Besides being time-consuming, colony assays do not identify causes of intrinsic resistance. We aimed to identify a biomarker for intrinsic radioresistance to be used before start of treatment and to reveal biological processes that could be targeted to overcome intrinsic resistance. Experimental design: We analyzed both micro- and messenger RNA expression in a large panel of HNSCC cell lines. Expression was measured on both irradiated and unirradiated samples. Results were validated using modified cell lines and a series of laryngeal cancer patients. Results: MiRs, mRNAs and gene sets that correlated with resistance could be identified from expression data of unirradiated cells. The presence of epithelial to mesenchymal transition (EMT) and low expression of miRs involved in the inhibition of EMT were important radioresistance determinants. This finding was validated in two independent cell line pairs, in which the induction of EMT reduced radiosensitivity. Moreover, low expression of the most important miR (miR-203) was shown to correlate with local disease recurrence after radiotherapy in a series of laryngeal cancer patients. Conclusions: These findings indicate that EMT and low expression of EMT-inhibiting miRs, especially miR-203, measured in pre-treatment material, causes intrinsic radioresistance of HNSCC, which could enable identification and treatment modification of radioresistant tumors.
2016-03-23 | GSE79493 | GEO
Project description:Purpose: Predominant causes of head and neck cancer recurrence after radiotherapy are rapid repopulation, hypoxia, fraction of cancer stem cells and intrinsic radioresistance. Currently, intrinsic radioresistance can only be assessed by ex-vivo colony assays. Besides being time-consuming, colony assays do not identify causes of intrinsic resistance. We aimed to identify a biomarker for intrinsic radioresistance to be used before start of treatment and to reveal biological processes that could be targeted to overcome intrinsic resistance. Experimental design: We analyzed both micro- and messenger RNA expression in a large panel of HNSCC cell lines. Expression was measured on both irradiated and unirradiated samples. Results were validated using modified cell lines and a series of laryngeal cancer patients. Results: MiRs, mRNAs and gene sets that correlated with resistance could be identified from expression data of unirradiated cells. The presence of epithelial to mesenchymal transition (EMT) and low expression of miRs involved in the inhibition of EMT were important radioresistance determinants. This finding was validated in two independent cell line pairs, in which the induction of EMT reduced radiosensitivity. Moreover, low expression of the most important miR (miR-203) was shown to correlate with local disease recurrence after radiotherapy in a series of laryngeal cancer patients. Conclusions: These findings indicate that EMT and low expression of EMT-inhibiting miRs, especially miR-203, measured in pre-treatment material, causes intrinsic radioresistance of HNSCC, which could enable identification and treatment modification of radioresistant tumors. Matched pairs of pre-treatment biopsies of 34 patients treated at The Netherlands Cancer Institute between 2002 and 2010. Patients with T2-3 laryngeal cancers, all treated with radiotherapy alone with a curative intent. The series was designed to be a matched cohort of 17 patients with local recurrences matched with 17 local cures. There were no significant differences between groups with and without local recurrence in age, gender, subsite, T-stage or treatment year.
2016-03-23 | E-GEOD-79493 | biostudies-arrayexpress
Project description:Twenty-five miRNAs were identified as having differential expression post-irradiation in CL1-0 or CL1-5 cells. Among these miRNAs, miR-449a, which was down-regulated in CL1-0 cells at 24 h after irradiation, was chosen for further investigation. Overexpression of miR-449a in CL1-0 cells effectively increased irradiation-induced DNA damage and apoptosis, altered the cell cycle distribution and eventually led to sensitization of CL1-0 to irradiation. MiR-449a might be a novel radiosensitizer for clinical applications. Two lung adenocarcinoma cell lines (CL1-0 and CL1-5) with different metastatic ability and radiosensitivity were used. In order to understand the regulatory mechanisms of differential radiosensitivity in these isogenic tumor cells, both CL1-0 and CL1-5 were treated with 10 Gy radiation, and were harvested respectively at 0, 1, 4, and 24 h after radiation exposure. The changes in expression of miRNA upon irradiation were examined using Illumina Human microRNA BeadChips.
2012-12-30 | E-GEOD-40602 | biostudies-arrayexpress