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A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

OTHER RELATED OMICS DATASETS IN: PRJNA412307PRJNA412430PRJNA412431

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE104309 | GEO | 2018/01/08

SECONDARY ACCESSION(S): PRJNA412307

REPOSITORIES: GEO

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A TFIID-SAGA Perturbation that Targets MYB and Suppresses Acute Myeloid Leukemia.

Project description:Targeting of general coactivators is an emerging strategy to interfere with oncogenic transcription factors (TFs). However, coactivator perturbations often lead to pleiotropic effects by influencing numerous TFs. Here we identify TAF12, a subunit of TFIID and SAGA coactivator complexes, as a selective requirement for acute myeloid leukemia (AML) progression. We trace this dependency to a direct interaction between the TAF12/TAF4 histone-fold heterodimer and the transactivation domain of MYB, a TF with established roles in leukemogenesis. Ectopic expression of the TAF4 histone-fold fragment can efficiently squelch TAF12 in cells, suppress MYB, and regress AML in mice. Our study reveals a strategy for potent MYB inhibition in AML and highlights how an oncogenic TF can be selectively neutralized by targeting a general coactivator complex.

| S-EPMC5764110 | biostudies-literature

A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia (ChIP-seq)

Project description:Targeting of general coactivators, such as BRD4, is an emerging strategy to interfere with oncogenic transcription factors (TFs) in cancer. However, coactivator perturbations have the potential to influence the function of numerous TFs, thereby resulting in biological pleiotropy. Here we identify TAF12, an 18 kilodalton subunit of TFIID/SAGA coactivator complexes, as a selective requirement for acute myeloid leukemia (AML) progression. We trace this AML-specific dependency to a direct interaction between the TAF12/TAF4 histone-fold heterodimer and the transactivation domain of MYB, a TF with established roles in leukemogenesis. Ectopic expression of a histone-fold domain fragment of TAF4 can efficiently squelch TAF12 in cells, suppress MYB, and regress AML in mice. Our study reveals a strategy for potent MYB inhibition in AML and highlights how an oncogenic TF can be selectively neutralized by targeting a general coactivator complex.

2018-01-08 | GSE104307 | GEO

A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia (RNA-seq)

2018-01-08 | GSE104308 | GEO

A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia

Project description:A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia

| PRJNA412307 | ENA

A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia (ChIP-seq)

Project description:A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia (ChIP-seq)

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A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia (RNA-seq)

Project description:A TFIID-SAGA perturbation that targets MYB and suppresses acute myeloid leukemia (RNA-seq)

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Peptidomimetic blockade of MYB in acute myeloid leukemia.

Project description:Aberrant gene expression is a hallmark of acute leukemias. MYB-driven transcriptional coactivation with CREB-binding protein (CBP)/P300 is required for acute lymphoblastic and myeloid leukemias, including refractory MLL-rearranged leukemias. Using structure-guided molecular design, we developed a peptidomimetic inhibitor MYBMIM that interferes with the assembly of the molecular MYB:CBP/P300 complex and rapidly accumulates in the nuclei of AML cells. Treatment of AML cells with MYBMIM led to the dissociation of the MYB:CBP/P300 complex in cells, its displacement from oncogenic enhancers enriched for MYB binding sites, and downregulation of MYB-dependent gene expression, including of MYC and BCL2 oncogenes. AML cells underwent mitochondrial apoptosis in response to MYBMIM, which was partially rescued by ectopic expression of BCL2. MYBMIM impeded leukemia growth and extended survival of immunodeficient mice engrafted with primary patient-derived MLL-rearranged leukemia cells. These findings elucidate the dependence of human AML on aberrant transcriptional coactivation, and establish a pharmacologic approach for its therapeutic blockade.

| S-EPMC5760651 | biostudies-literature

Peptidomimetic blockade of MYB in acute myeloid leukemia

Project description:This SuperSeries is composed of the SubSeries listed below.

2018-02-23 | GSE94242 | GEO

Acute myeloid leukemia targets for bispecific antibodies.

Project description:Despite substantial gains in our understanding of the genomics of acute myelogenous leukemia (AML), patient survival remains unsatisfactory especially among the older age group. T cell-based therapy of lymphoblastic leukemia is rapidly advancing; however, its application in AML is still lagging behind. Bispecific antibodies can redirect polyclonal effector cells to engage chosen targets on leukemia blasts. When the effector cells are natural-killer cells, both antibody-dependent and antibody-independent mechanisms could be exploited. When the effectors are T cells, direct tumor cytotoxicity can be engaged followed by a potential vaccination effect. In this review, we summarize the AML-associated tumor targets and the bispecific antibodies that have been studied. The potentials and limitations of each of these systems will be discussed.

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Identification of a c-MYB-directed therapeutic for acute myeloid leukemia.

Project description:A significant proportion of patients suffering from acute myeloid leukemia (AML) cannot be cured by conventional chemotherapy, relapsed disease being a common problem. Molecular targeting of essential oncogenic mediators is an attractive approach to improving outcomes for this disease. The hematopoietic transcription factor c-MYB has been revealed as a central component of complexes maintaining aberrant gene expression programs in AML. We have previously screened the Connectivity Map database to identify mebendazole as an anti-AML therapeutic targeting c-MYB. In the present study we demonstrate that another hit from this screen, the steroidal lactone withaferin A (WFA), induces rapid ablation of c-MYB protein and consequent inhibition of c-MYB target gene expression, loss of leukemia cell viability, reduced colony formation and impaired disease progression. Although WFA has been reported to have pleiotropic anti-cancer effects, we demonstrate that its anti-AML activity depends on c-MYB modulation and can be partially reversed by a stabilized c-MYB mutant. c-MYB ablation results from disrupted HSP/HSC70 chaperone protein homeostasis in leukemia cells following induction of proteotoxicity and the unfolded protein response by WFA. The widespread use of WFA in traditional medicines throughout the world indicates that it represents a promising candidate for repurposing into AML therapy.

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