Project description:Most of the NPC patients suffer from local recurrences and distant metastases within 1.5 years after radiotherapy due to radioresistance. Distinct patterns of miRNa expression and signatures were found in NPC, and have been used to associate them with cell proliferation, apoptosis, invasion and metastasis, but few miRNA expression profiling studies have been focused on the tumor radioresistance.We used miRNA expression microarray analyses to identify the difference of miRNA in radioresistant NPC CNE2-IR cells and radiosensitive CNE2 cells. Radioresistant subclone of nasopharyngeal carcinoma CNE2-IR cell line was cultured and produced according to the experienment schedule to undergo five rounds of sublethal dose of irradiation (11 Gy),and the parent cell line CNE2 sensitive to radiotherapy as the control
Project description:Most of the NPC patients suffer from local recurrences and distant metastases within 1.5 years after radiotherapy due to radioresistance. Distinct patterns of gene expression and signatures were found in NPC, and have been used to associate them with cell proliferation, apoptosis, invasion and metastasis, but few gene expression profiling studies have been focused on the tumor radioresistance.We used gene expression microarray analyses to identify the difference of mRNA in radioresistant NPC CNE2-IR cells and radiosensitive CNE2 cells. Radioresistant subclone of nasopharyngeal carcinoma CNE2-IR cell line was cultured and produced according to the experienment schedule to undergo five rounds of sublethal dose of irradiation (11 Gy), and the parent cell line CNE2 cell line sensitive to radiotherapy as the control
Project description:This SuperSeries is composed of the following subset Series:; GSE9712: Detection of genes differentially expressed in radioresistant tumors; GSE9713: Detection of genes differentially expressed in radioresistant and radiosensitive tumors before and after irradiation; GSE9714: Interferon response of radioresistant and radiosensitive human head&neck tumor cell lines Experiment Overall Design: Refer to individual Series
Project description:We have sequenced miRNA libraries from human embryonic, neural and foetal mesenchymal stem cells. We report that the majority of miRNA genes encode mature isomers that vary in size by one or more bases at the 3’ and/or 5’ end of the miRNA. Northern blotting for individual miRNAs showed that the proportions of isomiRs expressed by a single miRNA gene often differ between cell and tissue types. IsomiRs were readily co-immunoprecipitated with Argonaute proteins in vivo and were active in luciferase assays, indicating that they are functional. Bioinformatics analysis predicts substantial differences in targeting between miRNAs with minor 5’ differences and in support of this we report that a 5’ isomiR-9-1 gained the ability to inhibit the expression of DNMT3B and NCAM2 but lost the ability to inhibit CDH1 in vitro. This result was confirmed by the use of isomiR-specific sponges. Our analysis of the miRGator database indicates that a small percentage of human miRNA genes express isomiRs as the dominant transcript in certain cell types and analysis of miRBase shows that 5’ isomiRs have replaced canonical miRNAs many times during evolution. This strongly indicates that isomiRs are of functional importance and have contributed to the evolution of miRNA genes
Project description:We have sequenced miRNA libraries from human embryonic, neural and foetal mesenchymal stem cells. We report that the majority of miRNA genes encode mature isomers that vary in size by one or more bases at the 3’ and/or 5’ end of the miRNA. Northern blotting for individual miRNAs showed that the proportions of isomiRs expressed by a single miRNA gene often differ between cell and tissue types. IsomiRs were readily co-immunoprecipitated with Argonaute proteins in vivo and were active in luciferase assays, indicating that they are functional. Bioinformatics analysis predicts substantial differences in targeting between miRNAs with minor 5’ differences and in support of this we report that a 5’ isomiR-9-1 gained the ability to inhibit the expression of DNMT3B and NCAM2 but lost the ability to inhibit CDH1 in vitro. This result was confirmed by the use of isomiR-specific sponges. Our analysis of the miRGator database indicates that a small percentage of human miRNA genes express isomiRs as the dominant transcript in certain cell types and analysis of miRBase shows that 5’ isomiRs have replaced canonical miRNAs many times during evolution. This strongly indicates that isomiRs are of functional importance and have contributed to the evolution of miRNA genes Sequence library of miRNAs from a single sample of human foetal mesenchymal stem cells. Results tested and confirmed by northern blotting. Please note that only raw data files are available for the embryonic and neual samples and thus, directly submitted to SRA (SRX547311, SRX548700, respectively under SRP042115/PRJNA247767)