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Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition

ABSTRACT: We performed a targeted drug screen in isogenic human cell lines, identifying a number of actionable small molecules that specifically target CREBBP-mutated B-ALL. The most potent was the BCL2 inhibitor Venetoclax, which acts through a non-canonical mechanism resulting in ferroptotic cell death. CREBBP-mutated cell lines showed differences in cell-cycle, metabolism and response to oxidative stress. Lastly, we demonstrate that small-molecule inhibition of CREBBP sensitizes B-ALL cells, regardless of genotype, to Venetoclax-induced ferroptosis in-vitro and in-vivo, providing a potential novel drug combination for broader clinical translation in B-ALL.

ORGANISM(S): Homo sapiens

PROVIDER: GSE248265 | GEO | 2025/03/26

REPOSITORIES: GEO

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Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition [ChIP-seq]

Project description:B-cell acute lymphoblasTc leukemia (B-ALL) is a leading cause of death in childhood and outcomes in adults remain dismal. There is therefore an urgent clinical need for therapies that target the highest risk cases. MutaTons in the histone acetyltransferase CREBBP confer high-risk and increased chemoresistance in ALL. Performing a targeted drug-screen in isogenic human cell lines, we idenTfied a number of small molecules that specifically targeted CREBBP-mutated B-ALL, with the most potent the BCL2-inhibitor Venetoclax. Of note, this acted through a non-canonical mechanism resulTng in ferroptoTc rather than apoptoTc cell death. CREBBP-mutated cell lines showed differences in cell- cycle, metabolism, lipid composiTon and response to oxidaTve stress, predisposing them to ferroptosis, which were further dysregulated upon acquisiTon of Venetoclax resistance. Lastly, small- molecule inhibiTon of CREBBP pharmacocopies CREBBP-mutaTon, sensiTzing B-ALL cells, regardless of genotype, to Venetoclax-induced ferroptosis in-vitro and in-vivo, providing a potential novel drug combination for broader clinical translation in B-ALL.

2025-03-26 | GSE289011 | GEO

Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition [CUT&RUN]

2025-03-26 | GSE289012 | GEO

Ferroptotic Cell Death upon BCL2 Inhibition

Project description:B-cell acute lymphoblastic leukemia (B-ALL) is a leading cause of death in childhood and outcomes in adults remain dismal. There is therefore an urgent clinical need for therapies that target the highest risk cases. Mutations in the histone acetyltransferase CREBBP confer high-risk and increased chemoresistance in ALL. Performing a targeted drug-screen in isogenic human cell lines, we identified a number of small molecules that specifically targeted CREBBP-mutated B-ALL, with the most potent the BCL2-inhibitor Venetoclax. Of note, this acted through a non-canonical mechanism resulting in ferroptotic rather than apoptotic cell death. CREBBP-mutated cell lines showed differences in cell-cycle, metabolism, lipid composition and response to oxidative stress, predisposing them to ferroptosis, which were further dysregulated upon acquisition of Venetoclax resistance. Lastly, small-molecule inhibition of CREBBP pharmacocopies CREBBP-mutation, sensitizing B-ALL cells, regardless of genotype, to Venetoclax-induced ferroptosis in-vitro and in-vivo, providing a potential novel drug combination for broader clinical translation in B-ALL.

2025-04-01 | MSV000097461 | MassIVE

Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition

Project description:Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition

| PRJNA1043135 | ENA

Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition [ChIP-seq]

Project description:Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition [ChIP-seq]

| PRJNA1220605 | ENA

Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition [CUT&RUN]

Project description:Genetic or pharmacological inactivation of CREBBP sensitizes B-cell Acute Lymphoblastic Leukemia to Ferroptotic Cell Death upon BCL2 Inhibition [CUT&RUN]

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Crebbp deletion cooperates with Bcl2 over-expression to promote B-cell lymphoma in mice

Project description:We confirmed that common CREBBP mutations in human FL result in reduced acetyltransferase activity of the protein, and modeled this loss of function by B-cell-specific deletion of one or both alleles of Crebbp in transgenic mouse models. We show that Crebbp deletion results in deficits in B-cell development, and provide the first evidence from transgenic mouse models that Crebbp inactivation can cooperate with Bcl2 over-expression to promote B-cell lymphoma. Through transcriptional and epigenetic profiling of these B-cells we found that Crebbp inactivation was associated with broad transcriptional alterations, but no changes in the patterns of histone acetylation at the regulatory regions of these genes. In contrast, B-cells with Crebbp inactivation showed high expression of Myc and patterns of altered histone acetylation that were localized to intragenic regions that were enriched for Myc DNA binding motifs and Myc binding. These transgenic models therefore provide important links between Crebbp inactivation and Bcl2 dependence, and a potential role for Crebbp inactivation in the induction of Myc expression.

2017-06-01 | GSE85490 | GEO

CREBBP is a novel tumour suppressor in solid tumours

Project description:The contribution of the majority of frequently mutated genes to tumourigenesis is not fully defined. Many aggressive human cancers, such as triple negative breast cancers (TNBCs), have a poor prognosis and lack tractable biomarkers and targeted therapeutic options. Here, we systematically characterize loss-of-function mutations to generate a functional map of novel driver genes in a 3-dimensional model of breast cancer heterogeneity that more readily recapitulates the unfavourable tumour microenvironment in vivo. This identified the histone acetyltransferase CREBBP as a potent tumour suppressor gene whose silencing provided a 3D-specific growth advantage only under oxygen and nutrient deplete conditions. CREBBP protein expression was altered in a substantial proportion of TNBCs as well as several other solid tumours, including endometrial, bladder, ovarian and squamous lung cancers. In multiple primary tumours and cell models, loss of CREBBP activity resulted in upregulation of the FOXM1 transcriptional network. Strikingly, treatment with a range of CDK4/6 inhibitors (CDK4/6i), that indirectly target FOXM1 activity, selectively impaired growth in both CREBBP-altered spheroids and cell line xenografts and patient derived models from multiple tumour types. This study is the first to provide rationale for CREBBP as a biomarker for CDK4/6i response in cancer representing a new treatment paradigm for tumours that harbour CREBBP alterations that have limited therapeutic options.

2022-03-23 | PXD012098 | Pride

Adaptation of the epigenetic regulatory network to the loss of ARID1A and CREBBP

Project description:Epigenetic regulators (ERs) have a central role in regulating gene expression to define cell identity and are amongst the most frequently mutated genes in cancer. However, epigenetic regulators are rarely cell-essential, and in large CRISPR screening projects, human cell lines tolerate the knockout of many key epigenetic regulators with only minor effects on growth. These results indicate that human cells are robust to epigenetic disruption, but how epigenetic pathways interact to form a robust regulatory network is not understood. We are studying the loss of ARID1A and CREBBP, two important ERs that are frequently mutated in multiple cancer types. We analyzed histone post-translational modifications in ARID1A and CREBBP knockout lines in two normal (non-cancerous) human epithelial cell types, HME1 (ATCC, normal human breast epithelia) and HCEC-1CT (Evercyte, normal human colon epithelial).

2025-04-07 | PXD039819 | Pride

MDS and DNA repair defects in Crebbp+/- mice

Project description:Myelodysplastic syndrome (MDS) is considered a disease of hematopoietic stem cell (HSC) origin. To begin to unravel the molecular mechanisms underlying the deregulation of HSCs in MDS, we performed comparative gene expression profiling on Crebbp+/- and wild type HSCs. We chose to isolate HSCs from the fetal liver (FLHSC) because at this stage there were no differences in cell number between Crebbp+/- and wild type fetal livers, suggesting no overt hematopoietic differences. Thus, any change in gene expression found in Crebbp+/- FLHSCs is likely to reflect the initially compromised genetic program of HSC regulation, as opposed to that of Crebbp+/- HSCs in adult bone marrow, where secondary changes in gene expression may also occur as compensatory mechanisms for a compromised or failing hematopoietic system. We used day 14.5 post coitus FLHSC (Sca-1+,Lin-,AA4.1+,c-Kit++) from wild type (wt) and Crebbp heterozygous (ht) embryos to examine changes in gene expression before overt myelodysplastic disease manifestation. Total RNA from wt and Crebbp+/- FLHSCs was isolated, PCR-amplified using the Ovation RNA amplification system and hybridized to Affymetrix Mouse 430 2.0 expression microarrays.

2012-01-01 | E-GEOD-18061 | biostudies-arrayexpress

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