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Microarray expression data of A375 eIF4B-knockout (KO KO/LacZ) and eIF4B-rescued (KO/eIF4B) cells with or without vemurafenib treatment

ABSTRACT: Microarray expression data of A375 eIF4B-knockout (KO KO/LacZ) and eIF4B-rescued (KO/eIF4B) cells with or without vemurafenib treatment

PROVIDER: PRJNA743872 | ENA |

REPOSITORIES: ENA

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Microarray expression data of A375 eIF4B-knockout (KO; KO/LacZ) and eIF4B-rescued (KO/eIF4B) cells with or without vemurafenib treatment

Project description:Activating Transcription Factor 4 (ATF4) is a key transcription factor of the integrated stress response, which assists cells to survive in response to tumor microenvironmental and therapeutic stresses. BRAF inhibitors, such as vemurafenib, are also known to induce ATF4 in BRAF-mutated melanoma cells, but the mechanisms of ATF4 induction are not fully elucidated. Here, we show that ATF4 expression can be upregulated by eIF4B (eukaryotic initiation factor 4B) in BRAF-mutated A375 cells. In fact, knockout (KO) of eIF4B hindered ATF4 induction as well as ATF4 translation mechanism under vemurafenib treatment, which were effectively recovered by rescue of eIF4B. Transcriptome analysis revealed that eIF4B KO selectively affected ATF4-target gene expression among gene expression altered by vemurafenib. Our results indicate that eIF4B can contribute to cellular stress adaptation by regulating ATF4 expression.

2021-08-13 | GSE179452 | GEO

Expression data from BRAFV600E A375 melanoma cells treated with vehicle or vemurafenib

Project description:Vemurafenib is a BRAF inhibitor with specificity for the most common BRAF mutant encountered in melanomas (BRAFV600E). Vemurafenib suppresses the proliferation of BRAF mutant human melanoma cells by suppressing downstream activation of the MEK/ERK mitogen activated protein kinases. We used microarrays to examine the transcriptional response of a vemurafenib-sensitive BRAFV600E human melanoma cell line (A375) to vemurafenib in order to further delineate the mechanisms by which BRAFV600E drives cell proliferation and energy metabolism in human melanoma. BRAFV600E A375 human melanoma cells were treated with vehicle (0.1% DMSO) or 10 uM vemurafenib for 24 h after which total RNA was extracted. Cells were prepared and RNA was extracted in 3 separate batches (three different cell stocks on three separate days) providing three independent replicates (n=3). Paired replicates (prepared from the same stock of cells on the same day) are denoted by A, B and C.

2014-05-20 | E-GEOD-42872 | biostudies-arrayexpress

Expression data from BRAFV600E A375 melanoma cells treated with vehicle or vemurafenib

2014-05-20 | GSE42872 | GEO

Gene expression in Vemurafenib-treated A375 and A2058 melanoma cell lines

Project description:Human melanoma cell line A375 and A2058 were incubated with DMSO (control group) or Vemurafenib (1 μM in DMSO) for 72 hours. Total RNA was isolated with Qiagen RNA isolation kit; 1.5 μg of total RNA was used as template for cDNA synthesis.

2015-12-02 | GSE52882 | GEO

Gene expression of the A375 melanoma cell line treated with RAF inhibitors Vemurafenib and time-course with EGF stimulation during Vemurafenib RAF inhibitor treatment alone or with the MEK inhibitor Cobimetinib

Project description:We treated for 24 hours the BRAF-V600E melanoma cell line A375 with 7 doses of the RAF inhibitor Vemurafenib and, in a second experimental desing, we treated for 24 hours the BRAF-V600E melanoma cell line A375 with Vemurafenib (1 uM) alone or in combination with the MEK inhibitor Cobimetinib (1 uM) and subsequently stimulated with EGF in a time-course of 7 time points for up to 8 hours (0, 0.5, 1, 2, 3, 4, 8 hours).

2020-10-19 | GSE127988 | GEO

A four-arm study of A375 melanoma cell line-derived xenograft tumors in NSG mice treated with Vemurafenib and CB839

Project description:Melanoma is a rare but deadly form of skin cancer, which is often treated with BRAF inhibitors such as Vemurafenib (referred to as PLX4032). Whilst Vemurafenib prolongs the survival of patients, BRAF inhibitor resistance inevitably occurs in most cases. Previous studies demonstrated that metabolic rewiring occurs in BRAF inhibitor resistance and causes dependence on glutamine. To investigate whether this vulnerability could be exploited with clinically relevant drugs, we used the BRAF inhibitor, Vemurafenib, and the glutaminase imhibitor, CB839 to treat A375-derived melanoma xenografted tumors. We showed that whilst CB839 did not significantly affect the growth of A375-derived tumors compared to those given a vehicle, the addition of CB839 to Vemurafenib treatment had a significant anti-tumor effect. Tumors were taken at the endpoint (Max tumor length 15mm) from the 6 mice in each treatment group and cut into fragments and stored in RNAlater for RNAseq analysis. RNA extraction was performed on 1-3 fragments per tumor to make up 200-300mg of tissue.

2023-04-07 | E-MTAB-12811 | biostudies-arrayexpress

Vemurafenib induces a noncanonical senescence-associated secretory phenotype in melanoma cells which promotes vemurafenib resistance

Project description:To explore the characteristics of senescent melanoma cells induced by vemurafenib or cisplatin, melanoma A375 cells were treated with vemurafenib and cisplatin, respectively. The senescent phenotypes were verified by β-gal staining, EdU assay, cell morphology and the senescence-related pathways. RNA-seq was performed to explore the differentially expressed genes in the senescent cells induced by vemurafenib or cisplatin.

2023-07-07 | GSE209769 | GEO

A new ALK isoform transported by extracellular vesicles confers drug resistance to vemurafenib in A375 melanoma cells

Project description:Despite the successful use of drugs targeting the MAPK signaling pathway and immunotherapy in melanoma, the majority of patients with metastatic disease still undergo disease progression indicating a gradual development of therapy resistance. In the present study, microarray analyses were performed on BRAF inhibitor sensitive melanoma cells A375 and corresponding vemurafenib (PLX4032) - resistant cells A375_X1 to describe changes in the transcriptome that might play a role in drug resistance. For each cell line the microarray experiment was performed in duplicates.

2019-02-28 | E-MTAB-6596 | biostudies-arrayexpress

JQ1 +/- Vemurafenib in BRAF mutant melanoma (A375)

Project description:The combination of JQ1 and Vemurafenib acted synergistically in BRAF-mutant cell lines, resulting in marked apoptosis in vitro, with up-regulation of pro-apoptotic proteins. In vivo, combination treatment suppressed tumor growth and significantly improved survival compared to either drug alone. RNA sequencing of tumor tissues revealed almost four thousand genes that were uniquely modulated by the combination, with several anti-apoptotic genes significantly down-regulated.

2016-06-21 | GSE83592 | GEO

Expression Patterns of SOX10 deficient BRAFi/MEKi tolerant and SOX10 KO A375 cell lines

Project description:Given the heterogeneous expression of SOX10 in naïve melanoma, we sought to characterize SOX10 deficient population. To this end, we generated SOX10 CRISPR/Cas9 knockouts using two different guide RNAs (gRNA, #2 and #4) in the A375 (BRAF mutant) metastatic cell line. Using this approach, we identified multiple clones with loss of SOX10 expression. RNA-seq was performed to characterize the SOX10-regulated transcriptome. We used GSEA analysis to evaluate significant pathway changes in SOX10 knockout cells when compared to parental cells. We observed an enrichment in pathways associated with the tumor microenvironment (epithelial-mesenchymal transition; TGF beta signaling; extracellular structure organization; apical junction; hypoxia; angiogenesis), alterations in metabolic pathways (increase in the glycolysis pathway), a reduction in MYC and E2F targets and upregulation in p53 pathway and TNFA signaling via NFkB in the SOX10 knockout cells compared to parental cells. SOX10 negative clones have been identified in the minimal residual disease in BRAF mutant PDX models following BRAF and MEK inhibition and in patient samples while on treatment and SOX10 loss has been described as a resistant mechanism in BRAF mutant melanoma patients following vemurafenib treatment. Thus, we also analyzed the transcriptome profile of SOX10 low/deficient cells that arose following BRAFi+MEKi treatment in vivo. We performed GSEA analysis on RNA-seq data of CRT34 and CRT35 cells compared to parental A375 cells. CRT34 and CRT35 showed a very similar transcriptome profile to SOX10 KO cells when compared to A375 parental cells

2022-01-24 | GSE180568 | GEO

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