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Mus musculus

ABSTRACT: Gene expression alterations in Dnmt3aKO/FLT3-ITD leukemia

PROVIDER: PRJNA262830 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1594710_1.fastq.gz	Fastqsanger.gz
	SRR1594710_2.fastq.gz	Fastqsanger.gz
	SRR1594711_1.fastq.gz	Fastqsanger.gz
	SRR1594711_2.fastq.gz	Fastqsanger.gz
	SRR1594712_1.fastq.gz	Fastqsanger.gz

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Project description:RRBS assessment of global methylation alterations alterations in Dnmt3aKO/FLT3-ITD leukemia

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Project description:Trancription factor Fli1 occupancy in Dnmt3aKO/FLT3-ITD lymphoid leukemia

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WGBS assessment of global methylation alterations in Dnmt3aKO/FLT3-ITD lymphoid leukemia

Project description:We generated global DNA methylation maps of FLT3-ITD and Dnmt3aKO/FLT3-ITD lymphoid leukemias, as well as normal control thymocytes.

2016-05-19 | GSE80725 | GEO

Trancription factor Fli1 occupancy in Dnmt3aKO/FLT3-ITD lymphoid leukemia

Project description:We mapped binding of FLI1 in Dnmt3aKO/FLT3-ITD leukemias over-expressing Dnmt3a or GFP.

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MS-based phosphoproteomic of cytarabine-treated FLT3-ITD cells

Project description:ITD mutations in the FLT3 gene occur in the 30% of acute myeloid leukemia patients. The integration of ITD in the tyrosine kinase domain (TKD-ITD) of the FLT3 receptor has been shown to confer resistance to standard chemotherapy treatment. We applied state-of-the-art, high-sensitive, mass spectrometry (MS)-based (phospho)proteomics to investigate the molecular mechanisms underlying the sensitivity to cytarabine therapy in FLT3-ITD cells.

2023-07-20 | PXD038638 | Pride

Phosphoproteome Analysis Reveals Differential Mode of Action of Sorafenib in Wildtype and Mutated FLT3 AML Cells

Project description:Constitutively activating internal tandem duplication (ITD) alterations of the receptor tyrosine kinase FLT3 (Fms-like tyrosine kinase 3) are common in acute myeloid leukemia (AML) and classifies FLT3 as an attractive therapeutic target. So far, application of FLT3 small molecule inhibitors such as Sorafenib has resulted only in partial and transient clinical responses in FLT3-ITD+ patients. Only recently, a prolonged event-free survival has been observed in AML patients who were treated with Sorafenib in addition to standard therapy. Here, we studied the Sorafenib effect on proliferation in a panel of 13 FLT3-ITD- and FLT3-ITD+ AML cell lines. Sorafenib IC50 values ranged from 0.001 to 5.6 µM, whereas FLT3-ITD+ cells (MOLM-13, MV4;11) were found more sensitive to Sorafenib than FLT3-ITD- cells. However, we identified two FLT3-ITD- cell lines (MONO-MAC-1 and OCI-AML-2) which were also Sorafenib sensitive. Phosphoproteome analyses revealed that the affected pathways differed in Sorafenib sensitive FLT3-ITD- and FLT3-ITD+ cells. In MV4;11 cells Sorafenib suppressed mTOR signalling by inhibiting direct inhibition of FLT3. In MONO-MAC-1 cells Sorafenib inhibited the MEK/ERK pathway by inhibition of the RET tyrosine kinase. These data suggest that the FLT3 status in AML patients might not be the only predictive factor for a response to Sorafenib.

2017-05-02 | PXD004442 | Pride

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

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