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BCL6 is required for the initiation and maintenance of chronic myeloid leukemia

ABSTRACT: We identified the BCL6 protooncogene as a critical downstream effector of FoxO3A in self-renewal signaling of CML-initiating cells. BCL6 represses Arf and p53 in CML cells and is required for leukemia stem cell maintenance, colony formation and initiation of leukemia in transplant recipients. Importantly, peptide inhibition of BCL6 in human CML cells compromises colony formation and leukemia-initiation in xenotransplanted mouse recipients. These findings identify peptide-inhibition of BCL6 as a novel strategy to eradicate leukemia-initiating cells in CML.

ORGANISM(S): Homo sapiens

PROVIDER: GSE26085 | GEO | 2011/09/15

SECONDARY ACCESSION(S): PRJNA135225

REPOSITORIES: GEO

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BCL6 is required for the initiation and maintenance of chronic myeloid leukemia

Project description:We identified the BCL6 protooncogene as a critical downstream effector of FoxO3A in self-renewal signaling of CML-initiating cells. BCL6 represses Arf and p53 in CML cells and is required for leukemia stem cell maintenance, colony formation and initiation of leukemia in transplant recipients. Importantly, peptide inhibition of BCL6 in human CML cells compromises colony formation and leukemia-initiation in xenotransplanted mouse recipients. These findings identify peptide-inhibition of BCL6 as a novel strategy to eradicate leukemia-initiating cells in CML. Identification of BCL6 binding sites in human CML cell line JURL-MK1

2011-09-15 | E-GEOD-26085 | biostudies-arrayexpress

BCL6 mediates Chemoresistance in Acute Myeloid Leukemia

Project description:BCL6 is a transcription repressor that plays a crucial role in germinal center formation and lymphomagenesis. However, its role in myeloid malignancies remains unclear. Here, we explored the role of BCL6 in acute myeloid leukemia (AML). Heterogeneous levels of BCL6 were found across AML cell lines and primary AML samples. Cells with higher levels of BCL6 were indeed sensitive to treatment with BCL6 inhibitors. Gene expression profiling of AML cells treated with BCL6 inhibitor revealed a subset of target genes that are common with lymphoma cells. Ex vivo treatment of primary AML cells with BCL6 peptide inhibitor (BPI) induced apoptosis and decrease colony forming capacity which correlated with the levels of BCL6 expression . Importantly, inhibition of BCL6 in primary AML cells with either BPI or BCL6 siRNA resulted in significant reduction of leukemia initiating capacity using immunodeficient mice, suggesting ablation of leukemia stem cells (LSC). Such anti-LSC activity was also observed as downregulation of LSC gene signatures using gene expression analyses of cells treated with a BCL6 inhibitor. Importantly, treatment with cytarabine (AraC) induced BCL6 expression, and the levels of BCL6 induction were correlated with resistance to AraC. Treatment of AML primary derived xenografts (PDX) revealed that when AraC was combined with BCL6 inhibitor, inhibition of BCL6 significantly potentiated the efficacy of AraC and improved cytotoxic effects by interfering with the leukemia initiating capacity of AML cells. This suggests that pharmacological inhibition of BCL6 might provide a novel therapeutic strategy for ablation of LSCs and overcome chemoresistance in AML.

2020-08-01 | GSE133112 | GEO

Gene expression profiles of mouse BM LSKs, wild-type as well as Ezh2 KO mouse CML leukemia initiating cells (LICs)

Project description:Tyrosine kinase inhibitors (TKIs) have revolutionized chronic myelogenous leukemia (CML) management. Disease eradication, however, is hampered by innate resistance of leukemia initiating cells (LICs) to TKI-induced killing, which also provides the basis for subsequent emergence of TKI-resistant mutants. We report that EZH2, the catalytic subunit of Polycomb Repressive Complex 2 (PRC2), is overexpressed in CML LICs, required for colony formation, and survival and cell cycle progression of CML cell lines. A critical role for Ezh2 is supported by genetic studies in a mouse CML model. Inactivation of Ezh2 in conventional conditional mice and through CRISPR/Cas9-mediated gene editing prevents initiation and maintenance of disease and survival of LICs, irrespective of BCR/ABL1 mutational status, and extends survival. Expression of the Ezh2 homolog Ezh1 is reduced in Ezh2-deficient CML LICs, creating a scenario resembling complete loss of PRC2. EZH2-dependence of CML LICs raises prospects for improved therapy of TKI-resistant CML and/or eradication of disease by addition of EZH2 inhibitors.

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Gene expression data of BCR-ABL1 transformed myeloid cells from BCL6 wild-type and BCL6 knockout mice treated with and without Imatinib and RI-BPI

2011-08-24 | GSE24813 | GEO

Gene expression data of BCR-ABL1 transformed myeloid cells from BCL6 wild-type and BCL6 knockout mice treated with and without Imatinib and RI-BPI

Project description:To identify differences in the gene regulation between BCL6+/+ and BCL6-/- CML cells a gene expression analysis has been performed. We investigated the gene expression pattern in BCL6+/+ cells in the presence or absence of Imatinib and a combination of Imatinib and RI-BPI (a novel retro-inverso BCL6 peptide inhibitor). In BCL6-/- CML cells, we investigated the gene expression pattern in the presence or absence of Imatinib. BCR-ABL1 transformed myeloid cells from BCL6+/+ mice were cultured in the presence or absence of 10µM Imatinib or 10µM Imatinib and 20µM RI-BPI for 16 hours. BCR-ABL1 transformed myeloid cells from BCL6-/- mice were cultured in the presence or absence of 10µM Imatinib. Two samples for each condition were processed.

2011-08-23 | E-GEOD-24813 | biostudies-arrayexpress

The differentially expressed genes profile upon HNRPDL silencing in K562 cells

Project description:In our previous study, the roles of heterogeneous nuclear ribonucleoprotein D-like (HNRPDL) in CML cells were revealed. We found that overexpression of HNRPDL transformed murine BaF3 cells and induced lethal mice leukemia. Conversely, HNRPDL silencing inhibited colony-forming cell (CFC) production of CML CD34+ cells and attenuated BCR-ABL induced mice leukemia. In addition, HNRPDL modulated imatinib response of K562 cells and HNRPDL silencing sensitized CML CD34+ cells to imatinib treatment. To obtain molecular insights of how HNRPDL modulates the growth and imatinib response of human CML cells, we generated microarray data comparing HNRPDL silenced K562 cells with control (Scramble) cells.

2019-06-20 | GSE132975 | GEO

Transcriptome profiling of Bmi1 silenced-K562 CML cell line

Project description:The Bmi1 Polycomb protein is involved in the epigenetic repressive control of self renewal and survival of cancer initiating cells. In Chronic Myeloid Leukemia (CML), bmi1 expression increases gradually as the disease progresses from a chronic latent phase to a deadly blast crisis. We developped an inducible shRNA system to silence Bmi1 in the human K562 chronic myeloid leukemia (CML) cell line in order to identify new Bmi1-target genes.

2015-05-12 | GSE54262 | GEO

Transcriptome profiling of Bmi1 silenced-K562 CML cell line

2015-05-12 | E-GEOD-54262 | biostudies-arrayexpress

Gene expression-based imatinib response prediction in chronic phase CML

Project description:Tyrosine kinase inhibitor (TKI) treatment of chronic myeloid leukemia (CML) is guided by the pre-defined European Leukemia Net (ELN) or other response criteria. This allows patient stratification only during but not prior to treatment initiation. Gene expression profiling (GEP)-based response prediction might become a valuable tool for patient stratification in CML, but so far published data for response prediction are conflicting. We generated an imatinib response predicting gene signature by GEP from peripheral blood samples of pre-treated CML patients in late chronic phase.

2021-12-31 | GSE44589 | GEO

Comparison of normal mouse hematopoietic stem cells (HSC) to mobilized and leukemia-inducing hematopoietic stem cells

Project description:Highly purified Hematopoietic stem cells (HSC) from mouse bone marrow (BM) were compared to HSC after two days of cytoxan/GCSF treatment (Cyclophosphamide/granulocyte colony-stimulating factor) (Day2Mob) and leukemic HSC from mice lacking JunB. See Forsberg et. al. 2010 for details. CML - chronic myelogenous leukemia. Biological Replicate

2010-02-16 | E-GEOD-20359 | biostudies-arrayexpress

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