Project description:GAS2DN could suppress the growth of chronic myeloid leukemia cells, including K562, MEG-01 and CD34+ cells from patients. In addition, GAS2DN inhibited the tumorigenic ability of MEG-01 cells in nude mice. To understand the molecular insight of this inhibitory effect of GAS2DN, global gene expression were performed. The control and GAS2DN-transduced MEG-01 cells were used for microarray analysis.
Project description:GAS2DN could suppress the growth of chronic myeloid leukemia cells, including K562, MEG-01 and CD34+ cells from patients. In addition, GAS2DN inhibited the tumorigenic ability of MEG-01 cells in nude mice. To understand the molecular insight of this inhibitory effect of GAS2DN, global gene expression were performed. The control and GAS2DN-transduced MEG-01 cells were used for microarray analysis. Three biological independent extracts of control and GAS2DN-transduced cells were pooled together with equal amount, and then the pooled samples were compared with Affymetrix chips.
Project description:Gene expression profiling of immortalized human mesenchymal stem cells with hTERT/E6/E7 transfected MSCs. hTERT may change gene expression in MSCs. Goal was to determine the gene expressions of immortalized MSCs.
Project description:Transcriptional profiling of the effect of shRNA silencing of Runx1 in human AMkL Meg-01 cells. RNA samples obtained from two independent colonies were compared to RNAs from negative control transductions in a two-color design. A total of four microarrays were completed, with a dye-swapped pair performed for each colony.
Project description:Transcriptional profiling of the effect of shRNA silencing of Runx1 in human AMkL Meg-01 cells. RNA samples obtained from two independent colonies were compared to RNAs from negative control transductions in a two-color design. A total of four microarrays were completed, with a dye-swapped pair performed for each colony. Two-condition experiment, Runx1 knockdown vs. negative transduction controls. Biological replicates: 2 knockdown replicates, 2 control replicates.
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:Platelets and their extracellular vesicles (EVs) have emerged as promising liquid biopsy biosources for cancer detection and monitoring. The megakaryoblastic MEG-01 cell line offers a controlled system for generating platelet-like particles (PLPs) and EVs through valproic acid induced differentiation. Here, we performed comprehensive characterization and proteomic validation of MEG-01-derived populations, native human platelets and their EVs using nanoparticle tracking analysis, transmission electron microscopy, imaging flow cytometry and quantitative proteomics. MEG-01 megakaryocytic differentiation is characterized by polylobulated nuclei, proplatelet formation and elevated CD41/CD42a expression. PLPs predominantly exhibit an activated-like phenotype (CD62P+, degranulated morphology), while microvesicles (100-500 nm) and exosomes (50-250 nm) displayed size distributions and phenotypic markers consistent with native platelet-derived EVs. Proteomics identified substantial core proteomes shared across fractions and fraction-specific patterns consistent with selective cargo partitioning during EV biogenesis. Functional enrichment revealed that MEG-01-derived vesicles retained hemostatic, cytoskeletal and immune pathways characteristic of physiological platelet EVs. Ingenuity Pathway Analysis demonstrated that PLPs maintained proliferative transcriptional programs (elevated MYC/RB1/TEAD1, reduced GATA1), while plasma exosomes showed minimal differential pathway activation relative to MEG-01 exosomes. These findings validate MEG-01-derived EVs as representative of megakaryocyte-lineage exosomes and activated platelet-like states; plasma exosomes converge proteomically with EXOs MEG-01, whereas platelet exosomes retain distinct activation-associated features.