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Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy

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

ORGANISM(S): Homo sapiens

PROVIDER: GSE151598 | GEO | 2020/12/22

REPOSITORIES: GEO

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Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy [ChIP-seq]

Project description:Histone demethylases such as KDM4B play critical roles in oncogenic pathophysiology and, therefore may be effective targets for anticancer therapy. Using a TR-FRET demethylation screen assay, in combination with multiple orthogonal validation approaches, we identified geldanamycin and its analog 17-DMAG as novel KDM4B inhibitors. In addition, we found that these Hsp90 inhibitors effect increased degradation of the alveolar rhabdomyosarcoma (aRMS) driver oncoprotein PAX3-FOXO1 and induce the H3K9me3 and H3K36me3 at genomic loci of PAX3-FOXO1 targets. We found that as monotherapy 17-DMAG significantly inhibits expression of PAX3-FOXO1 target genes and multiple oncogenic pathways, induces a muscle differentiation signature, delays tumor growth and extends survival in aRMS xenograft mouse models. The combination of 17-DMAG with conventional chemotherapy significantly enhances therapeutic efficacy, indicating that targeting KDM4B in combination with chemotherapy may serve as a novel therapy to PAX3-FOXO1-positive aRMS.

2020-12-22 | GSE151493 | GEO

Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy [RNA-seq]

Project description:Histone lysine demethylases (KDMs) are emerging as therapeutic targets in cancer. Development of potent KDM inhibitors may provide additional options for epigenomics-oriented therapies. Using a Time-Resolved Fluorescence Resonance Energy Transfer (TR-FRET) functional demethylation assay, in combination with a high-content immunofluorescence imaging phenotypic screen, Matrix-Assisted Laser Desorption/Ionization- Fourier Transform Ion Cyclotron Resonance mass spectrometry (MALDI-FTICR MS) and Amplified Luminescent Proximity Homogeneous Assay (ALPHA), we identified geldanamycin, an inhibitor of heat shock protein 90 (Hsp90), as a novel inhibitor of JmjC-domain containing demethylases such as KDM4B. We further found that geldanamycin can destabilize the PAX3-FOXO1 fusion oncoprotein, an Hsp90 client, which is a driver of clinically unfavorable alveolar rhabdomyosarcoma (aRMS). We then hypothesized that dual inhibition of PAX3-FOXO1 and epigenetic modifiers of aRMS would have synergistic antitumor activity. We repurposed the geldanamycin analog 17-DMAG to target aRMS and found that 17-DMAG significantly delays tumor growth , extends survival in xenograft mouse models, and inhibits expression of PAX3-FOXO1 targets and multiple oncogenic pathways including MYC, E2F and NOTCH. In addition, the combination of 17-DMAG with conventional chemotherapy or the bromodomain inhibitor JQ1 significantly enhances therapeutic efficacy. In summary, we have identified geldanamycin and 17-DMAG as dual KDM/Hsp90 inhibitors and 17-DMAG is efficacious against PAX3-FOXO1-driven rhabdomyosarcoma.

2020-12-21 | GSE151514 | GEO

Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy

Project description:Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy

| PRJNA636501 | ENA

Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy [RNA-seq]

Project description:Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy [RNA-seq]

| PRJNA636180 | ENA

Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy [ChIP-seq]

Project description:Identification of 17-DMAG as a novel KDM4B inhibitor for combination therapy [ChIP-seq]

| PRJNA635950 | ENA