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TP53 wild type/PPM1D mutant diffuse intrinsic pontine gliomas are sensitive to a MDM2 antagonist

ABSTRACT: TP53 wild type/PPM1D mutant diffuse intrinsic pontine gliomas are sensitive to a MDM2 antagonist

PROVIDER: PRJNA781664 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16977181_1.fastq.gz	Fastqsanger.gz
	SRR16977181_2.fastq.gz	Fastqsanger.gz
	SRR16977182_1.fastq.gz	Fastqsanger.gz
	SRR16977182_2.fastq.gz	Fastqsanger.gz
	SRR16977183_1.fastq.gz	Fastqsanger.gz

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TP53 wild type/PPM1D mutant diffuse intrinsic pontine gliomas are sensitive to a MDM2 antagonist

Project description:this study demonstrates the pre-clinical efcacy potential of RG7388 in the TP53 wild type/PPM1D mutant DIPG subgroup in the TP53 wild-type/PPM1D mutant DIPG subgroup mutant DIPG subgroup

2021-11-20 | GSE189152 | GEO

TP53 wild-type/PPM1D mutant diffuse intrinsic pontine gliomas are sensitive to a MDM2 antagonist.

Project description:Diffuse intrinsic pontine gliomas (DIPGs) are high-grade tumors of the brainstem that often occur in children, with a median overall survival of less than one year. Given the fact that DIPGs are resistant to chemotherapy and are not amenable to surgical resection, it is imperative to develop new therapeutic strategies for this deadly disease. The p53 pathway is dysregulated by TP53 (~ 60%) or PPM1D gain-of-function mutations (~ 30%) in DIPG cases. PPM1D gain-of-function mutations suppress p53 activity and result in DIPG tumorigenesis. While MDM2 is a major negative regulator of p53, the efficacy of MDM2 inhibitor has not been tested in DIPG preclinical models. In this study, we performed a comprehensive validation of MDM2 inhibitor RG7388 in patient-derived DIPG cell lines established from both TP53 wild-type/PPM1D-mutant and TP53 mutant/PPM1D wild-type tumors, as well in TP53 knockout isogenic DIPG cell line models. RG7388 selectively inhibited the proliferation of the TP53 wild-type/PPM1D mutant DIPG cell lines in a dose- and time-dependent manner. The anti-proliferative effects were p53-dependent. RNA-Seq data showed that differential gene expression induced by RG7388 treatment was enriched in the p53 pathways. RG7388 reactivated the p53 pathway and induced apoptosis as well as G1 arrest. In vivo, RG7388 was able to reach the brainstem and exerted therapeutic efficacy in an orthotopic DIPG xenograft model. Hence, this study demonstrates the pre-clinical efficacy potential of RG7388 in the TP53 wild-type/PPM1D mutant DIPG subgroup and may provide critical insight on the design of future clinical trials applying this drug in DIPG patients.

| S-EPMC8565061 | biostudies-literature

PPM1D mutations are oncogenic drivers of Diffuse Midline Gliomas and are sufficient to enhance glioma formation

Project description:The role of PPM1D mutations in de novo gliomagenesis has not been systematically explored. Here we analyze whole genomes sequences of 170 pediatric high-grade gliomas and find that truncating mutations in PPM1D that increase the stability of its phosphatase are clonal driver events in 11% of DMGs and are enriched in primary pontine tumors. Through the development of novel DMG mouse models, we show that PPM1D mutations potentiate gliomagenesis and that PPM1D activity is required for in vivo oncogenesis. Finally, we applied integrative phosphoproteomic and functional genomics assays and found that the oncogenic effects of PPM1D truncation converge on regulators of cell cycle, DNA damage response, and p53 pathways, revealing therapeutic vulnerabilities including MDM2 inhibition. Together, these findings highlight PPM1D mutations to represent a targetable driver of pediatric gliomas.

2021-07-11 | GSE179813 | GEO

Characterizing TP53 and PPM1D mutations as resistance drivers to radiation therapy in Diffuse Intrinsic Pontine Gliomas

Project description:Characterizing TP53 and PPM1D mutations as resistance drivers to radiation therapy in Diffuse Intrinsic Pontine Gliomas

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Characterizing TP53 and PPM1D mutations as resistance drivers to radiation therapy in Diffuse Intrinsic Pontine Gliomas

Project description:Characterizing TP53 and PPM1D mutations as resistance drivers to radiation therapy in Diffuse Intrinsic Pontine Gliomas

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Genome-wide Analyses of Diffuse Intrinsic Pontine Gliomas

Project description:Purpose: More than 90% of children with diffuse intrinsic pontine glioma (DIPG) die within 2 years of diagnosis. There is a dire need to identify therapeutic targets, however lack of patient material for research has limited progress. We evaluated a large cohort of diffuse intrinsic pontine gliomas (DIPGs) to identify recurrent genomic abnormalities and gene expression signatures underlying DIPG. Patients and Methods: We used single nucleotide polymorphism arrays to evaluate genomic copy number imbalances in 43 DIPGs from 40 patients and in 8 low-grade exophytic brainstem gliomas. Gene expression arrays were used to evaluate expression signatures from 27 DIPGs, 6 low-grade exophytic brainstem gliomas and 66 low-grade gliomas arising outside the brainstem. Results: Frequencies of specific large-scale and focal imbalances varied significantly between DIPGs and pediatric glioblastomas outside the brainstem. Focal amplifications of genes within the receptor tyrosine kinase-Ras-PI3-kinase signaling pathway were found in 47% of DIPG, with PDGFRA and MET showing the highest frequency. 30% of DIPG contained focal amplifications of cell-cycle regulatory genes controlling RB phosphorylation, and 21% had concurrent amplification of genes from both pathways. Some tumors showed heterogeneity in amplification patterns. DIPGs showed distinct gene expression signatures relating to developmental processes compared to pediatric glioblastomas arising outside the brainstem, while expression signatures of low-grade exophytic brainstem gliomas were similar to low-grade gliomas outside the brainstem. Copy number analaysis: 43 DIPG samples, 8 Low Grade Gliomas using SNP6.0. Available matched normals are also profiled with SNP6.0. Expression analysis: 29 DIPG samples, 6 Low grade samples Please contact Suzanne Baker at Suzanne.Baker@stjude.org for CEL files and genotype calls.

2011-09-20 | E-GEOD-26576 | biostudies-arrayexpress

Illumina Infinium HumanMethylation450 BeadChip profiling of paediatric high grade gliomas and diffuse intrinsic pontine gliomas

Project description:We have used Illumina Infinium HumanMethylation450 BeadChip array profiling to profile paediatric high grade gliomas and diffuse intrinsic pontine gliomas. The 450K methylation array is being used to separate brain tumour samples on the basis of their methylation profiles which represent the cell of origin the time and place in which tumours arise. Methylation arrays provide data for an integrated molecular diagnosis of brain tumours and define specific molecular subgroups and subtypes of high grade gliomas carrying distinct driver mutations and patterns of somatic alterations. These data form part of an integrated meta-analysis of high grade gliomas in children combining DNA copy number, methylation and high throughput sequencing datasets.

2017-09-28 | E-MTAB-5528 | biostudies-arrayexpress

Pembrolizumab in Treating Younger Patients With Recurrent, Progressive, or Refractory High-Grade Gliomas, Diffuse Intrinsic Pontine Gliomas, Hypermutated Brain Tumors, Ependymoma or Medulloblastoma

Project description:This phase I trial studies the side effects and best dose of pembrolizumab and to see how well it works in treating younger patients with high-grade gliomas (brain tumors that are generally expected to be fast growing and aggressive), diffuse intrinsic pontine gliomas (brain stem tumors), brain tumors with a high number of genetic mutations, ependymoma or medulloblastoma that have come back (recurrent), progressed, or have not responded to previous treatment (refractory). Immunotherapy with monoclonal antibodies, such as pembrolizumab, may induce changes in the body’s immune system, and may interfere with the ability of tumor cells to grow and spread.

| 2183538 | ecrin-mdr-crc

Genome-wide Analyses of Diffuse Intrinsic Pontine Gliomas

2011-09-21 | GSE26576 | GEO

Wnt5a and its downstream transcription factor Stat3 are therapeutic targets for diffuse intrinsic pontine gliomas

Project description:Understand how Wnt5a depletion affects the growth of diffuse intrinsic pontine gliomas

2019-04-29 | GSE130407 | GEO