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Tumor cell-specific inhibition of MYC function using small molecule inhibitors of the HUWE1 ubiquitin ligase

ABSTRACT: Deregulated expression of MYC is a driver of colorectal carcinogenesis, necessitating novel strategies to inhibit MYC function. The ubiquitin ligase HUWE1 (HECTH9, ARFBP1, MULE) associates with both MYC and the MYC-associated protein MIZ1. We show here that HUWE1 is required for growth of colorectal cancer cells in culture and in orthotopic xenograft models. Using high throughput screening, we identify small molecule inhibitors of HUWE1, which inhibit MYC-dependent transactivation in colorectal cancer cells, but not in stem and normal colon epithelial cells. Inhibition of HUWE1 stabilizes MIZ1. MIZ1 globally accumulates on MYC target genes and contributes to repression of MYC-activated target genes upon HUWE1 inhibition. Our data show that transcriptional activation by MYC in colon cancer cells requires the continuous degradation of MIZ1 and identify a novel principle that allows for inhibition of MYC function in tumor cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE59223 | GEO | 2014/10/21

SECONDARY ACCESSION(S): PRJNA254756

REPOSITORIES: GEO

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Tumor cell-specific inhibition of MYC function using small molecule inhibitors of the HUWE1 ubiquitin ligase

Project description:Deregulated expression of MYC is a driver of colorectal carcinogenesis, necessitating novel strategies to inhibit MYC function. The ubiquitin ligase HUWE1 (HECTH9, ARFBP1, MULE) associates with both MYC and the MYC-associated protein MIZ1. We show here that HUWE1 is required for growth of colorectal cancer cells in culture and in orthotopic xenograft models. Using high throughput screening, we identify small molecule inhibitors of HUWE1, which inhibit MYC-dependent transactivation in colorectal cancer cells, but not in stem and normal colon epithelial cells. Inhibition of HUWE1 stabilizes MIZ1. MIZ1 globally accumulates on MYC target genes and contributes to repression of MYC-activated target genes upon HUWE1 inhibition. Our data show that transcriptional activation by MYC in colon cancer cells requires the continuous degradation of MIZ1 and identify a novel principle that allows for inhibition of MYC function in tumor cells. MIZ1 and MYC ChIPseq experiments in HUWE1 inhibitor-treated Ls174T cells as well as RNAseq experiments in HUWE1- or MIZ1-depleted Ls174T cells after HUWE1 inhibitor treatment. Sequencing was performed on an Illumina Genome Analyzer IIx.

2014-10-21 | E-GEOD-59223 | biostudies-arrayexpress

Hepatic Huwe1 loss protects mice from non-alcoholic fatty liver disease through lipid metabolic rewiring

Project description:Non-alcoholic fatty liver disease (NAFLD) is the most prevalent form of liver disease worldwide and is estimated to affect nearly a third of the population. Huwe1, also known as ARF-BP1, MULE, and HectH9, is a HECT (homology to E6-APC terminus)-domain E3 ubiquitin ligase originally identified as a binding partner of the tumor suppressor ARF, as well as a direct negative regulator of the tumor suppressor p53. To further elucidate the in vivo role of Huwe1, we generated a liver-specific Huwe1 (Huwe1LKO) knockout mouse model. Surprisingly, liver-specific knockout of Huwe1 protected mice from the development of age-induced hepatic steatosis. To elucidate the mechanism underlying this phenotype, bulk RNAseq analysis was performed on liver tissues from 1-year-old Huwe1LKO and Huwe1WTmice.

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The ubiquitin ligase HUWE1 regulates hematopoietic stem cell maintenance and lymphoid commitment [microarray]

Project description:We identified the ubiquitin ligase Huwe1 as a crucial regulator of hematopoietic stem cell (HSC) functions. We generated Huwe1 conditional knock-out mice and discovered that the loss of this ligase causes an increased proliferation and stem cell exhaustion, together with a decreased lymphoid specification in vivo. We observed that the ubiquitin ligase Huwe1 is controlling the expression of N-myc at the level of the most immature stem and progenitor hematopoietic populations, mediating the described effects. Hematopoietic stem cells (HSC) from the bone marrow of transgenic animals carrying a N-myc/mCherry fusion gene were sorted according to N-myc expression (defined by mCherry) into N-myc high and low subpopulations. Each of these 2 populations was subjected to microarray gene expression profiling.

2016-08-20 | E-GEOD-85832 | biostudies-arrayexpress

Hepatic Huwe1 loss protects mice from non-alcoholic fatty liver disease through lipid metabolic rewiring

Project description:Non-alcoholic fatty liver disease (NAFLD) is the most prevalent form of liver disease worldwide and is estimated to affect nearly a third of the population. Huwe1, also known as ARF-BP1, MULE, and HectH9, is a HECT (homology to E6-APC terminus)-domain E3 ubiquitin ligase originally identified as a binding partner of the tumor suppressor ARF, as well as a direct negative regulator of the tumor suppressor p53. To further elucidate the in vivo role of Huwe1, we generated a liver-specific Huwe1 (Huwe1LKO) knockout mouse model. Surprisingly, liver-specific knockout of Huwe1 protected mice from the development of age-induced hepatic steatosis. To elucidate the mechanism underlying this phenotype, mass spectrometry analysis was performed on liver tissues from 1-year-old Huwe1LKO and Huwe1WT mice.

2024-01-26 | PXD045279 | Pride

Regulation of stem cell maintenance and lymphoid specification by the ubiquitin ligase Huwe1

Project description:The ubiquitin ligase Huwe1 regulates stem cell quiescence, maintenance and lymphoid specification by controlling the expression of N-Myc.

2016-08-18 | GSE85488 | GEO

The ubiquitin ligase HUWE1 regulates hematopoietic stem cell maintenance and lymphoid commitment [microarray]

2016-08-20 | GSE85832 | GEO

Huwe1 supports B-cell development, B-cell-dependent immunity, somatic hypermutation and class switch recombination by regulating proliferation

Project description:The development and differentiation of B cells is intimately linked to cell proliferation and the generation of diverse immunoglobulin gene (Ig) repertoires. The ubiquitin E3 ligase HUWE1 controls proliferation, DNA damage responses, and DNA repair, including the base excision repair (BER) pathway. These processes are of crucial importance for B-cell development in the bone marrow, and the germinal center (GC) response, which results in the clonal expansion and differentiation of B cells expressing high affinity immunoglobulins. Here, we re-examined the role of HUWE1 in B-cell proliferation and Ig gene diversification, focusing on its involvement in somatic hypermutation (SHM) and class switch recombination (CSR). B-cell-specific deletion of Huwe1 resulted in impaired development, differentiation and maturation of B cells in the bone marrow and peripheral lymphoid organs. HUWE1 deficiency diminished SHM and CSR by impairing B-cell proliferation and AID expression upon activation in vitro and in vivo, and was unrelated to the HUWE1-dependent regulation of the BER pathway. Interestingly, we found that HUWE1-deficient B cells showed increased mRNA expression of Myc target genes upon in vitro activation despite diminished proliferation. Our results confirm that the E3 ligase HUWE1 is an important contributor in coordinating the rapid transition of antigen naïve, resting B cells into antigen-activated B cells and regulates mutagenic processes in B cells by controlling AID expression and the post-transcriptional output of Myc target genes.

2022-12-23 | GSE221351 | GEO

The ubiquitin ligase HUWE1 regulates hematopoietic stem cell maintenance and lymphoid commitment [high-throughput sequencing]

2016-08-17 | GSE85723 | GEO

Tumor cell-specific inhibition of MYC function using small molecule inhibitors of the HUWE1 ubiquitin ligase

Project description:HUWE1 was depleted in Ls174T cells with an shRNA and the expression changes relative to a control shRNA were analyzed with microarray. Ls174T cells were treated with two separate HUWE1 inhibitor compounds (BI8622/BI8626) at concentrations of 20 uM and expression profiles relative to DMSO treated control were monitored via microarray. HUWE1-depleted Ls174T cells were treated with BI8622 (20uM) and expression profiles relative to BI8622-treated non-depleted cells were analyzed.

2014-10-22 | E-MTAB-1890 | biostudies-arrayexpress

Analysis of MIZ1, MYC-ER and MYC-ERVD binding sites in MCF10A cells

Project description:Oncogenic levels of Myc expression sensitize cells to multiple apoptotic stimuli and this protects long-lived organisms from cancer development. How cells discriminate physiological from supra-physiological levels of Myc is largely unknown. Here we show that induction of apoptosis by Myc in breast epithelial cells requires association of Myc with Miz1. Gene expression and ChIP-sequencing experiments show that oncogenic levels of Myc, but not of MycV394D, a point mutant that does not bind Miz1, recruit Miz1 to core promoters and enable binding of Myc/Miz1 complexes to low-affinity target sites, correlating with repression of a specific set of target genes. Repressed genes encode proteins involved in cell adhesion, migration and wound healing; their promoters are enriched for binding sites of the serum response (SRF) factor. Restoring SRF activity attenuates Myc-induced apoptosis in response to glutamine starvation, exposure to Trail and to DNA damage. We propose that supra-physiological levels of Myc engage Miz1 in repressive DNA binding complexes and suppress transcriptional progress.

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