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RNA-seq data of BRAF wild-type and BRAF mutant tumor cells treated with the ERK inhibitor GDC-0994

ABSTRACT: RNA-seq data of BRAF wild-type and BRAF mutant tumor cells treated with the ERK inhibitor GDC-0994

PROVIDER: PRJNA1100606 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28700388_1.fastq.gz	Fastqsanger.gz
	SRR28700388_2.fastq.gz	Fastqsanger.gz
	SRR28700389_1.fastq.gz	Fastqsanger.gz
	SRR28700389_2.fastq.gz	Fastqsanger.gz
	SRR28700390_1.fastq.gz	Fastqsanger.gz

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RNA-seq data of BRAF wild-type and BRAF mutant tumor cells treated with the ERK inhibitor GDC-0994

Project description:BRAF or RAS mutation-induced aberrant activation of the mitogen-activated protein kinase (MAPK) pathway is frequently observed in human cancers. As the key downstream node of MAPK pathway, ERK1/2 is as an important therapeutic target. GDC-0994 (ravoxertinib), an orally bioavailable, highly selective small-molecule inhibitor of ERK1/2, showed acceptable safety and pharmacodynamic profile in a recent phase I clinical trial. In this study, we investigated dependence of the anti-tumor effect of ERK inhibitor GDC-0994 on genetic alterations in the MAPK pathway. Our date showed that the expression of a large number of genes, particularly the genes in the cell cycle pathway, were significantly changed after GDC-0994 treatment in BRAF mutant cells, while no remarkable expression change of such genes was observed in wild-type cells.

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GDC-0879, a BRAF V600E inhibitor, protects kidney podocytes from death

Project description:Sieber J, Wieder N, Clark A, Reitberger M, Matan S, Schoenfelder J, Zhang J, Mandinova A, Bittker JA, Gutierrez J, Aygun O, Udeshi N, Carr SA, Mundel P, Jehle AW, and Greka A. Cell Chem Bio 2017. Progressive kidney diseases affect approximately 500 million people worldwide. Podocytes are terminally differentiated cells of the kidney filter, whose loss leads to disease progression and kidney failure. To date, there are no therapies to promote podocyte survival. Drug repurposing may therefore help accelerate the development of cures in an area of tremendous unmet need. In a newly developed high-throughput screening assay of podocyte viability, we identified the BRAF V600E inhibitor GDC-0879 and the adenylate cyclase agonist forskolin as podocyte survival promoting compounds. GDC-0879 protects podocytes from injury through paradoxical activation of the MEK/ERK pathway. Forskolin promotes podocyte survival by attenuating protein biosynthesis. Importantly, GDC-0879 and forskolin are shown to promote podocyte survival against an array of cellular stressors. This work reveals new therapeutic targets for much needed podocyte-protective therapies, and provides insights into the use of GDC-0879-like molecules for the treatment of progressive kidney diseases.

2017-10-27 | MSV000081651 | MassIVE

eIF4F controls ERK MAPK signaling in melanomas with BRAF and NRAS mutations

Project description:The eIF4F translation initiation complex plays a critical role in melanoma resistance to clinical BRAF and MEK inhibitors. In this study, we uncover a novel function of eIF4F in the negative regulation of the RAS/RAF/MEK/ERK mitogen-activated protein kinase (MAPK) signaling pathway. We demonstrate that eIF4F is essential for maintaining optimal ERK signaling intensity in treatment-naïve melanoma cells harboring BRAF or NRAS mutations. Specifically, the dual-specificity phosphatase DUSP6/MKP3, which acts as a negative feedback regulator of ERK activity, requires continuous production in an eIF4F-dependent manner to limit excessive ERK signaling driven by oncogenic RAF/RAS mutations. Treatment with small molecule eIF4F inhibitors disrupts the negative feedback control of MAPK signaling, leading to ERK hyperactivation and EGR1 overexpression in melanoma cells in vitro and in vivo. Furthermore, our quantitative analyses reveal a high spare signaling capacity in the ERK pathway, suggesting that eIF4F-dependent feedback keeps the majority of ERK molecules inactive under normal conditions. Overall, our findings highlight the crucial role of eIF4F in regulating ERK signaling flux and suggest that pharmacological eIF4F inhibitors can disrupt the negative feedback control of MAPK activity in melanomas with BRAF and NRAS activating mutations.

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BRAF siRNA NHGRI_Liang_BRAF

Project description:BRAF, one of three RAF serine/threonine kinases (ARAF, BRAF and CRAF), plays a major role in the RAS-RAF-MEK-ERK mitogen-activated protein kinase (MAPK) signaling pathway, which mediates cellular responses to growth signals. Recently a high frequency (~60%-70%) of activating BRAF mutations (predominantly V600E) has been reported in malignant melanoma. In order to identify the downstream effects of BRAF signaling on melanoma cell growth and gene expression, cDNA microarray analysis was carried out following BRAF siRNA or MEK1/2 inhibitor (U0126) treatment. Keywords: time series, siRNA time series, siRNA, drug treatment

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Transcriptomic profiling of melanomas treated with BRAF inhibitor

Project description:Transcriptomic profiling of melanomas treated with BRAF inhibitor

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protein levels in BRAF inhibitor resistance melanoma cells treated with PF3758309

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Project description:In melanoma, dysregulation of the MAPK pathway, usually via BRAF(V600) or NRAS(Q61) somatic mutations, leads to constitutive ERK signaling. While BRAF inhibitors are initially effective for BRAF-mutant melanoma, no FDA-approved targeted therapies exist for BRAF-inhibitor-resistant BRAF(V600), NRAS mutant, or wild-type melanoma.The 50% inhibitory concentration (IC50) of SCH772984, a novel inhibitor of ERK1/2, was determined in a panel of 50 melanoma cell lines. Effects on MAPK and AKT signaling by western blotting and cell cycle by flow cytometry were determined.Sensitivity fell into three groups: sensitive, 50% inhibitory concentration (IC50) < 1 ?M; intermediately sensitive, IC50 1-2 ?M; and resistant, >2 ?M. Fifteen of 21 (71%) BRAF mutants, including 4 with innate vemurafenib resistance, were sensitive to SCH772984. All three (100%) BRAF/NRAS double mutants, 11 of 14 (78%) NRAS mutants and 5 of 7 (71%) wild-type melanomas were sensitive. Among BRAF(V600) mutants with in vitro acquired resistance to vemurafenib, those with MAPK pathway reactivation as the mechanism of resistance were sensitive to SCH772984. SCH772984 caused G1 arrest and induced apoptosis.Combining vemurafenib and SCH722984 in BRAF mutant melanoma was synergistic in a majority of cell lines and significantly delayed the onset of acquired resistance in long term in vitro assays. Therefore, SCH772984 may be clinically applicable as a treatment for non-BRAF mutant melanoma or in BRAF-mutant melanoma with innate or acquired resistance, alone or in combination with BRAF inhibitors.

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protein levels in BRAF/MEK inhibitor resistance melanoma cells treated with PF3758309 [CR]

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2017-07-31 | GSE96902 | GEO

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