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Epigenetic silencing of UBXN8 contributes to leukemogenesis of t(8;21) acute myeloid leukemia

ABSTRACT: The formation of the AML1-ETO fusion protein, resulting from the t(8;21) translocation, is considered to be among the t(8;21) acute myeloid leukemia (AML) initiating events. However, the mechanisms of the oncogenic activity of AML1-ETO remains unclear. In this study, we found that AML1-ETO triggers the heterochromatic silencing of UBXN8 by recognizing the AML1 binding sites and recruiting chromatin remodeling enzymes to the UBXN8 promoter region. Decitabine, a specific inhibitor of DNA methylation, upregulated the expression of UBXN8 in AML1-ETO+ AML cell lines. Overexpression of UBXN8 inhibited the proliferation and colony-forming ability and promoted cell cycle arrest in t(8;21) AML cell lines. Enhancement of UBXN8 level can significantly inhibit the tumor proliferation of AML1-ETO+ cells in vivo. Thus, our results indicated that epigenetic silencing of UBXN8 via its promoter region methylation mediated by the AML1-ETO fusion protein contributes to the leukemogenesis of t(8;21)AML. These results demonstrated the feasibility and effectiveness of the pharmacological disruption of AML1-ETO/HDACs/DNMTs complex and that the UBXN8 targeting maybe an potential therapeutic strategy for t(8;21)AML.

ORGANISM(S): Homo sapiens

PROVIDER: GSE155466 | GEO | 2021/07/31

REPOSITORIES: GEO

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Epigenetic minicircuitry of AML1-ETO/THAP10/MIR383 contributes t(8;21) AML leukemogenesis

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Project description:Cancer cells maintain a sensitive balance between growth-promoting oncogenes and apoptosis inhibitors. We show that WT RUNX1 is required for survival of t(8;21)-Kasumi-1 and inv(16)-ME-1 AML cell lines. The malignant AML phenotype is sustained by a delicate AML1-ETO/RUNX1 balance that involves competition for common DNA binding sites regulating a subset of AML1-ETO/RUNX1 targets. Genome expression was profiled after performing knockdown of RUNX1 and AML1-ETO in Kasumi-1 cells using specific siRNA-oligo nucleotides, and analyzed using Affymetrix Gene 1.0 ST arrays.

2013-08-18 | E-GEOD-45743 | biostudies-arrayexpress

Addiction of t(8;21) and inv(16) AML to native RUNX1 [Gene Expression data]

2013-08-18 | GSE45743 | GEO

Addiction of t(8;21) and inv(16) AML to native RUNX1 [ChIP-Seq data]

2013-08-18 | GSE45738 | GEO

Addiction of t(8;21) and inv(16) AML to native RUNX1 [ChIP-Seq data]

Project description:Cancer cells maintain a sensitive balance between growth-promoting oncogenes and apoptosis inhibitors. We show that WT RUNX1 is required for survival of t(8;21)-Kasumi-1 and inv(16)-ME-1 AML cell lines. The malignant AML phenotype is sustained by a delicate AML1-ETO/RUNX1 balance that involves competition for common DNA binding sites regulating a subset of AML1-ETO/RUNX1 targets. Genomewide sequencing data is included herein: Transcription factors RUNX1 c-terminus and n-terminus which is shared with AML1-ETO were profiled independently), AML1-ETO and AP4 were profiled using ChIP-Seq in Kasumi-1 cells, as well as control ChIP-Seq experiments of non immune serum. Two replicates were performed for each transcription factor profiling and control experiment.

2013-08-18 | E-GEOD-45738 | biostudies-arrayexpress

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