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Expression profile of wild type (WT) vs miR-155-/- in FLT3-ITD+ AML (MV4-11) cell lines

ABSTRACT: The expression profile in miR-155-/- FLT3-ITD+ AML is unknown. Using empty vector (EV) or two distinct miR-155 (S3 or S10) lentiviral CRISPR-Cas9 infected FLT3-ITD+ AML cell lines (MV4-11 cells), we performed next generation RNA sequencing to determine the expression profile in these cells dependent on miR-155. We found a number of pathways dysregulated, including STAT5 activation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE71541 | GEO | 2016/07/01

SECONDARY ACCESSION(S): PRJNA291483

REPOSITORIES: GEO

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Expression profile of wild type (WT) vs miR-155-/- in FLT3-ITD+ AML (MV4-11) cell lines

Project description:The expression profile in miR-155-/- FLT3-ITD+ AML is unknown. Using empty vector (EV) or two distinct miR-155 (S3 or S10) lentiviral CRISPR-Cas9 infected FLT3-ITD+ AML cell lines (MV4-11 cells), we performed next generation RNA sequencing to determine the expression profile in these cells dependent on miR-155. We found a number of pathways dysregulated, including STAT5 activation. RNAseq was performed on EV or miR-155 lentiviral CRISPR-Cas9 infected MV4-11 cell lines in triplicate cultures.

2016-07-01 | E-GEOD-71541 | biostudies-arrayexpress

Next generation sequencing identifies small RNA expression in FLT3-ITD+ AML (MV4-11) cell lines

Project description:The expression level of microRNAs in FLT3-ITD+ AML is unknown. Using empty vector (EV) lentiviral CRISPR-Cas9 infected FLT3-ITD+ AML cell lines (MV4-11 cells), we performed next generation RNA sequencing on small RNAs to determine microRNA expression level in these cells. We found a variety of evolutionarily conserved and non-conserved microRNAs expressed in our cells of interest. Small RNAseq on EV lentiviral CRISPR-Cas9 infected MV4-11 cell lines was performed on triplicate cultures.

2016-07-01 | E-GEOD-71543 | biostudies-arrayexpress

Next generation sequencing identifies small RNA expression in FLT3-ITD+ AML (MV4-11) cell lines

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Expression profile of hematopoietic stem and progenitor cell (HSPC) compartment of FLT3-ITD and FLT3-ITD miR-155-/- mice

Project description:The miR-155-dependent differences in gene expression in the HSPC compartment of FLT3-ITD mice is unknown. In this experiment, we performed RNA sequencing on FLT3-ITD and FLT3-ITD miR-155-/- mouse LKS cells.

2017-09-08 | GSE86526 | GEO

GRP94 rewires and buffers the FLT3-ITD signaling network and promotes survival of acute myeloid leukemic stem cells

Project description:Internal tandem duplications in the tyrosine kinase receptor FLT3 (FLT3-ITD) are among the most common lesions in acute myeloid leukemia (AML) and there exists a need for new forms of treatment. Using ex vivo drug sensitivity screening, we found that FLT3-ITD+ patient cells are particularly sensitive to HSP90 inhibitors. While it is well known that HSP90 is important for FLT3-ITD stability, we found that HSP90 family members play a much more complex role in FLT3-ITD signaling than previously appreciated. First, we found that FLT3-ITD activates the unfolded protein response (UPR), leading to increased expression of GRP94/HSP90B1. GRP94 rewires FLT3-ITD signaling by binding and retaining FLT3-ITD in the ER, where it aberrantly activates downstream signaling pathways. Second, HSP90 family proteins protect FLT3-ITD+ AML cells against apoptosis by alleviating proteotoxic stress, and treatment with HSP90 inhibitors results in proteotoxic overload that triggers UPR-induced apoptosis. Importantly, leukemic stem cells are strongly dependent upon HSP90 for their survival, and the HSP90 inhibitor ganetespib causes leukemic stem cell exhaustion in mouse PDX models. Taken together, our study reveals a molecular basis for HSP90 addiction of FLT3-ITD+ AML cells and provides a rationale for including HSP90 inhibitors in the treatment regime for FLT3-ITD+ AML.

2020-09-02 | PXD009423 | Pride

CircMYBL2 Regulates FLT3-ITD FLT3AML Translation in AML

Project description:CircMYBL2 is more highly expressed in AML patients with FLT3-ITD mutations than in those without the FLT3-ITD mutation. We found that circMYBL2 knockdown specifically inhibits proliferation and promotes the differentiation of FLT3-ITD AML cells in vitro and in vivo. We used the ribosome profiling and RNA-seq libraries sequenced with Illumina HiSeq 2500 to identify the mRNA that circMYBL2 targeted. Interestingly, we found that circMYBL2 significantly influences the protein level of mutant FLT3 kinase, which contributes to the activation of FLT3-ITD-dependent signaling pathways. Mechanistically, circMYBL2 enhanced the translational efficiency of FLT3 kinase by increasing the binding of PTBP1 to FLT3 mRNA. Moreover, circMYBL2 knockdown impaired the cytoactivity of inhibitor-resistant FLT3-ITD-positive cells, with a significant decrease in FLT3 kinase expression, followed by the inactivation of its downstream pathways. In summary, we are the first to reveal a circRNA that specifically influences FLT3-ITD AML and regulates FLT3 kinase levels through translational regulation, suggesting that circMYBL2 may be a potential therapeutic target for FLT3-ITD AML.

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MicroRNA profiling of human acute myeloid leukemia samples from patients characterized for subcellular localization/mutation status of NPM1 and FLT3 mutations

Project description:Acute myeloid leukemia (AML) carrying NPM1 mutations and cytoplasmic nucleophosmin (NPMc+ AML) accounts for about one-third of adult AML and shows distinct features, including a unique gene expression profile. MicroRNAs (miRNAs) are small noncoding RNAs of 19-25 nucleotides in length that have been linked to the development of cancer. Here, we investigated the role of miRNAs in the biology of NPMc+ AML. The miRNA expression was evaluated in 85 adult de novo AML patients characterized for subcellular localization/mutation status of NPM1 and FLT3 mutations using a custom microarray platform. Data were analyzed by using univariate t test within BRB tools. We identified a strong miRNA signature that distinguishes NPMc+ mutated (n = 55) from the cytoplasmic-negative (NPM1 unmutated) cases (n = 30) and includes the up-regulation of miR-10a, miR-10b, several let-7 and miR-29 family members. Many of the down-regulated miRNAs including miR-204 and miR-128a are predicted to target several HOX genes. Indeed, we confirmed that miR-204 targets HOXA10 and MEIS1, suggesting that the HOX up-regulation observed in NPMc+ AML may be due in part by loss of HOX regulators-miRNAs. FLT3-ITD+ samples were characterized by up-regulation of miR-155. Further experiments demonstrated that the up-regulation of miR-155 was independent from FLT3 signaling. Our results identify a unique miRNA signature associated with NPMc+ AML and provide evidence that support a role for miRNAs in the regulation of HOX genes in this leukemia subtype. Moreover, we found that miR-155 was strongly but independently associated with FLT3-ITD mutations.

2008-03-14 | E-TABM-429 | biostudies-arrayexpress

Phosphoproteomics of human MV4-11 AML cells treated with Gilteritinib

Project description:Internal tandem duplications (ITD) in the receptor tyrosine kinase FLT3 occur in 25% of acute myeloid leukemia (AML) patients and lead to constitutive activation of FLT3, driving leukemia cell survival and proliferation. Quizartinib, crenolanib and gilteritinib are second-generation FLT3 inhibitors (FLT3i) in phase III trials or clinical use for the targeted treatment of FLT3-ITD+ AML. However, they demonstrated only limited benefit and were not curative. A full understanding of cellular resistance factors contributing to this poor response is lacking. Here, we examined cell-autonomous pathways modulated by FLT3i using global translatome and phosphoproteome proteomics to identify non-genetic resistance mechanisms.

2022-08-25 | PXD023123 | Pride

Comparation the mRNA Expression Profile of the MV4-11 Sorafenib Resistant Cells and the Parental Cells

Project description:Our gene set analysis of MV4-11-R versus MV4-11 indicated decreased depolarization of mitochondria and mitochondrial membrane, mitochondrial dysfunction and anti-apoptosis as other top ranked molecular or cellular functions of differential gene sets. expression of most genes encoding glycolytic enzymes was up-regulated in MV4-11-R cells we revealed a metabolic alteration in sorafenib-resistant cell lines with mitochondrial respiration deficiency, leading to substantial decrease of mitochondria-derived ATP generation and a significant increase in glycolytic activity to maintain sufficient ATP production. Our study revealed a metabolic signature of sorafenib resistance and indicated that increase of glycolytic activity including upregulation of major glycolytic enzymes may be viewed as a marker for early detection of sorafenib resistance in AML patients with FLT3/ITD mutation and glycolytic inhibitors warrant further investigation as alternative therapeutic agents for sorafenib-resistant cells Sorafenib resistant cells MV411-R VS. parental MV4-11 cells. Biological replicates: 3 control replicates, 3 treated replicates.

2016-08-01 | E-GEOD-74666 | biostudies-arrayexpress

Gene expression analysis of Ba/F3-ITD cells treated with DMSO or sorafenib

Project description:The aim of the study is to analyse whether the Sorafenib renders FLT3-ITD-positive acute myeloid leukemia (AML) cells more immunogenic . We used Ba/F3-ITD cells as a model cell line to study the effect of Sorafenib on FLT3-ITD-positive AML cells. Ba/F3-ITD cells are murine pro-B cell lines with a stable FLT3-ITD expression. Ba/F3-ITD cells were treated with DMSO or 10nM sorafenib for 24 hours. Cells were harvested and total RNA was isolated

2018-02-01 | E-MTAB-4487 | biostudies-arrayexpress

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