Unknown,Transcriptomics,Genomics,Proteomics

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Differentially expressed miRNAs in TGF-M-NM-21-knock down mice CT26 colorectal cancer cell lines vs controls

ABSTRACT: To investigate the role of TGF-M-NM-21-regulated miRNAs in the progression of colorectal cancer,we performed comprehensive miRMA microarray analysis on RNA derived from CT26 cell lines and TGF-M-NM-21 knock-down CT26 cell lines. We identified a novel set of TGF-M-NM-21-related miRNAs. Total RNA was isolated from TGF-M-NM-21-knock down CT26 cell lines and controls.Three-condition experiment: Locked nucleic acid microarray analyses to obtain miRNA expression profiles independently in TGFM-NM-21-knocked down CT26 and control cell line at three different time (24hours, 48hours and 72hours).Biological replicates: 1 CT26 cells stably transfected with shRNA-TGF-M-NM-21- pSUPER gfp-neo for 24hours, 1 CT26 cells stably transfected with shRNA-TGF-M-NM-21- pSUPER gfp-neo for 48hours, 1 CT26 cells stably transfected with shRNA-TGF-M-NM-21- pSUPER gfp-neo for 72hours, 1 CT26 cells stably transfected with shRNA-Control- pSUPER gfp-neo for 24hours, 1 CT26 cells stably transfected with shRNA- Control- pSUPER gfp-neo for 48hours, 1 CT26 cells stably transfected with shRNA-Control- pSUPER gfp-neo for 72hours, independently grown and harvested. One replicate per array.

ORGANISM(S): Mus musculus

SUBMITTER: shouli wang

PROVIDER: E-GEOD-53337 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Epithelial-mesenchymal transition (EMT) has recently been recognized as a key element of cell invasion, migration, metastasis, and drug resistance in several types of cancer, including non-small cell lung cancer (NSCLC). Our aim was to clarify microRNA (miRNA) -related mechanisms underlying EMT followed by acquired resistance to epidermal growth factor receptor tyrosine-kinase inhibitor (EGFR-TKI) in NSCLC. MiRNA expression profiles were examined before and after transforming growth factor-beta1 (TGF-M-NM-21) exposure in four human adenocarcinoma cell lines with or without EMT. Correlation between expressions of EMT-related miRNAs and resistance to EGFR-TKI gefitinib was evaluated. MiRNA array and quantitative RT-PCR revealed that TGF-M-NM-21 significantly induced overexpression of miR-134, miR-487b, and miR-655, which belong to the same cluster located on chromosome 14q32, in lung adenocarcinoma cells with EMT. MAGI2 (membrane-associated guanylate kinase, WW and PDZ domain-containing protein 2), a predicted target of these miRNAs and a scaffold protein required for PTEN (phosphatase and tensin homolog), was diminished in A549 cells with EMT after the TGF-M-NM-21 stimulation. Overexpression of miR-134 and miR-487b promoted the EMT phenomenon and affected the drug resistance to gefitinib, whereas knockdown of these miRNAs inhibited the EMT process and reversed TGF-M-NM-21-induced resistance to gefitinib. Our study demonstrated that the miR-134/487b/655 cluster contributed to the TGF-M-NM-21-induced EMT phenomenon and affected the resistance to gefitinib by directly targeting MAGI2, whose suppression subsequently caused loss of PTEN stability in lung cancer cells. The miR-134/miR-487b/miR-655 cluster may be new therapeutic targets in advanced lung adenocarcinoma patients, depending on the EMT phenomenon. miRNA expression profiles before and after TGF-M-NM-21 exposure were assessed in the four lung adenocarcinoma cell lines, A549, LC2/ad, PC3, and, PC9 by TaqMan miRNA arrays. Relative ratios of miRNAs in cells after TGF-M-NM-21 exposure were calculated when compared with the cells before TGF-M-NM-21 exposure.

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Differentially expressed miRNAs in TGF-M-NM-21-knock down mice CT26 colorectal cancer cell lines vs controls

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