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Time-series RNA-seq experiment performed on nine melanoma cell lines treated with BRAF inhibitor vemurafenib.

ABSTRACT: Time-series RNA-seq experiment performed on nine melanoma cell lines treated with BRAF inhibitor vemurafenib.

PROVIDER: PRJEB21553 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR2019440.fastq.gz	Fastqsanger.gz
	ERR2019450.fastq.gz	Fastqsanger.gz
	ERR2019460.fastq.gz	Fastqsanger.gz
	ERR2019470.fastq.gz	Fastqsanger.gz
	ERR2019441.fastq.gz	Fastqsanger.gz

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Time-series RNA-seq experiment performed on 10 melanoma cell lines treated with BRAF inhibitor vemurafenib.

Project description:BRAF targeted drug vemurafenib have shown very good clinical benefit in melanoma patient containing BRAF V600E mutation. However, resistance always occurs in patient. Early stage of the resistance development require the tumor cell adapted to the targeted drug. We are trying to study the kinetic of melanoma cell adaptation towards vemurafenib. 10 melanoma cell lines with BRAF mutation are treated with targeted therapy vemurafenib. RNA-seq samples are collected after drug treatment for different time (day3 and day21) to compare with DMSO-treated control samples for each cell line. Except innate resistant cell line M381, all other cell lines shows inhibition of proliferation. However, a small cluster of cell lines (M397, M229 and M263) shows some other unique transcriptomic change. For cell line M397, M229 and M263, we also collected the RNA-seq data for long-term (73day/90day) drug treatment condition where the cells developed resistance to vemurafenib treatment. Dedifferentiation is enriched in these unique transcriptomic change within these 3 cell lines. Similar cell state dedifferentiation phenomenon is also reported to cause resistance towards immunotherpay where the resistant de-differentiated melanoma cells are induced by TNF which is secreted by tumor-infiltrating T cells. We also treat our cultured melanoma cells with TNF and collected the treated sample for RNA-seq experiment.

2019-06-22 | E-MTAB-5493 | biostudies-arrayexpress

Vemurafenib response and resistance analysis of metastatic melanomas with mutant and wild type BRAF

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scRNAseq of BRAF-mutant Colo205 cells control or treated for 24h or 72h with vemurafenib

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2021-07-19 | E-MTAB-9890 | 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.

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Concomitant BCORL1 and BRAF mutations in vemurafenib-resistant melanoma cells

Project description:BRAF is the most frequently mutated gene in melanoma. Constitutive activation of mutant BRAFV600E leads to aberrant Ras-independent MAPK signaling and cell transformation. Inhibition of mutant BRAF is a current front-line therapy for such cases, with improved survival compared with chemotherapy. Unfortunately, reactivation of MAPK signaling by several mechanisms has been shown to cause drug resistance and disease recurrence. In this work, we describe the co-occurrence of an in-frame deletion within an amplified BRAFV600E locus, and a missense point mutation of the transcriptional repressor BCORL1, in vemurafenib-resistant A375 melanoma cells. Functional data confirmed that truncated p47BRAFV600E and mutant BCORL1Q1076H both contribute to resistance. Interestingly, either endogenous BCORL1 silencing or ectopic BCORL1Q1076H expression mimicked the effects of a CRISPR/Cas9-edited BCORL1Q1076H locus, suggesting a change-of-function mutation. Transcriptomic data confirmed this hypothesis. Finally, we show that the pan-RAF inhibitor sorafenib is not affected by expression of BRAF deletion variant and effectively synergizes with vemurafenib to block resistant cells, suggesting a possible intervention for this class of mutants.

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Vemurafenib, BRAF inhibitor, Resistance in BRAFV600E Positive Thyroid Cancer cell lines

Project description:We report the application of single-molecule-based sequencing technology for high-throughput profiling of RNAs in BRAFV600E+ thyroid cancer cell lines 8505C and WRO. We generated genome-wide transcriptome maps of 8505C and WRO cells after vemurafenib, BRAF inhibitor, treatment. In addition, we generated genome-wide transcriptome maps of clonally selected vemurafenib-resistant 8505C and WRO cells with or without vemurafenib treatment. Negative control treatment was 0.1% of dimethy solfoxide (DMSO), the diluent used to resuspend vemurafenib. The treatment regine of vemurafenib was 2 µM concentration for 24 hours. We find that both inducible response to BRAFi and acquired BRAFi resistance in thyroid cancer cells showed significant activation of the JAK/STAT pathway. Our study demonstrates that the JAK/STAT-signaling pathway is activated as thyroid cancer cells develop resistance to BRAFi and that this pathway is a potential target for anticancer activity and to overcome drug resistance that commonly develops to treatment with BRAFi in thyroid cancer and potentially in other malignancies.

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Project description:CGH profiling of M249 melanoma cell line treated with step-wise increasing Vemurafenib and Selumetinib to develop resistance (VSR). The resistance mechanims was through BRAF amplification in double minute (DM) format. The control cell line is untreated M249.

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

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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

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.

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