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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transposon mutagenesis reveals fludarabine-resistance mechanisms in chronic lymphocytic leukemia

ABSTRACT: Purpose:To identify resistance mechanisms for the chemotherapeutic drug fludarabine in chronic lymphocytic leukemia (CLL), as innate and acquired resistance to fludarabine-based chemotherapy represents a major challenge for long-term disease control. Methods: We employed piggyBac transposon-mediated mutagenesis, combined with next-generation sequencing, to identify genes that confer resistance to fludarabine in a human CLL cell line. Results: RNA-seq profiling of fludarabine-resistant cells suggested deregulated MAPK signaling as involved in mediating drug resistance in CLL. To address if the fludarabine-resistant HG3 cells were transcriptionally different at a global level compared to their parental cells, we performed RNA-sequencing of three pairs of HG3 pools

ORGANISM(S): Homo sapiens

SUBMITTER: Liqun He

PROVIDER: E-GEOD-75844 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Transposon mutagenesis reveals fludarabine-resistance mechanisms in chronic lymphocytic leukemia

Project description:Purpose:To identify resistance mechanisms for the chemotherapeutic drug fludarabine in chronic lymphocytic leukemia (CLL), as innate and acquired resistance to fludarabine-based chemotherapy represents a major challenge for long-term disease control. Methods: We employed piggyBac transposon-mediated mutagenesis, combined with next-generation sequencing, to identify genes that confer resistance to fludarabine in a human CLL cell line. Results: RNA-seq profiling of fludarabine-resistant cells suggested deregulated MAPK signaling as involved in mediating drug resistance in CLL.

2016-03-31 | GSE75844 | GEO

Gamma-secretase inhibitor plus fludarabine in CLL

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Gamma-secretase inhibitor plus fludarabine in CLL

Project description:Combination of GSI with fludarabine has a synergistic antileukemic effect in primary NOTCH1-mutated CLL cells We used microarrays to detail the mechanism of synergy of GSI and fludarabine combination in NOTCH1-mutated CLL cells Global RNA expression in CLL primary cells treated with GSI, fludarabine and the combination at 48 hours of treatment

2013-09-21 | E-GEOD-51044 | biostudies-arrayexpress

Changes in gene expression induced by CDK9 inhibition alone and in combination with fludarabine

Project description:Using a transcriptomics approach we explored the mechanism(s) of synergy observed between CDKI-73 and fludarabine in primary CLL cells. The cytotoxic effects of CDKI-73 were associated with transcriptional inhibition of cdk9 target genes including MCL1 and XIAP. In contrast, fludarabine induced the transcription of these genes, an effect that was reversed by the combination of CDKI-73 and fludarabine. We used microarrays to explore the cytoxic synergy observed in primary CLL cells when we combined a novel CDK9 inhibitor with the purine nucleoside analogue fludarabine

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Changes in gene expression induced by CDK9 inhibition alone and in combination with fludarabine

2013-06-25 | E-GEOD-48258 | biostudies-arrayexpress

Fludarabine resistance in Mantle cell lymphoma

Project description:SILAC analysis of fludarabine resistance in human Mino cells.

2015-08-03 | PXD002034 | Pride

Transposon mutagenesis screen identifies MHC class II transactivator (CIITA) as an inducer of cellular resistance to Ebola virus and SARS Coronavirus

Project description:U2OS cells were co-transfected with PiggyBac (PB) transposon plasmid pPB-SB-CMV-puro-SD3 and the transposase p-hyPBASE. The modified PiggyBac (PB) transposon, which has a constitutively active CMV promoter which can stimulate or disrupt expression of neighboring genes, depending on insertional orientation. For each library, between 107-108 cells were transfected, cultured with the addition of 2 µg/ml puromycin for one week to select cells that had incorporated the transposon, and then used for screens of virus resistance with minimal further expansion. Mutagenized cells were challenged with replication-competent recombinant EboGP-VSV at MOI of 1 or 10 and propagated for up to 3 weeks with regular media changes to select virus-resistant colonies. After virus resistant cells were selected, genomic DNA (gDNA) was isolated from 5-10 X 106 cells and transposon insertion sites were mapped using high throughput sequencing.

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Fludarabine resistance in Mantle cell lymphoma

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A Drug Repurposing Screen Identifies Fludarabine Phosphate as a Potential Therapeutic Agent for N-MYC Overexpressing Neuroendocrine Prostate Cancers

Project description:Neuroendocrine prostate cancer (NEPC) represents a highly aggressive form of prostate tumors. NEPC results from trans-differentiated castration-resistant prostate cancer (CRPC) with increasing evidence indicating that the incidence of NEPC often results from the adaptive response to androgen deprivation therapy. Recent studies have shown that a subset of NEPC exhibits overexpression of the MYCN oncogene along with the loss of tumor suppressing TP53 and RB1 activities. N-MYC is structurally disordered with no binding pockets available on its surface and so far, no clinically approved drug is available. We adopted a drug-repurposing strategy, screened ~1800 drug molecules and identified Fludarabine Phosphate to preferentially inhibit proliferation of N-MYC overexpressing NEPC cells by inducing ROS. We also show that Fludarabine phosphate affects N-MYC protein levels and N-MYC transcriptional targets in NEPC cells. Moreover, enhanced ROS production destabilizes N-MYC protein by inhibiting AKT signaling and is responsible for the reduced survival of NEPC cells and tumors. Our results indicate that increasing ROS production by administration of Fludarabine Phosphate may represent an effective treatment option for patients with N-MYC overexpressing NEPC tumors.

2022-07-20 | GSE181119 | GEO

Transcription profiling of doxorubicin sensitive and resistant human myeloma cell lines after treatment with doxorubicin to explore the role of the STAT1 signaling pathway in drug and radiation resistance

Project description:The myeloma cell line RPMI 8226/S and its doxorubicin resistant subline 8226/Dox40 were used as models to explore the potential importance of the STAT1 signaling pathway in drug and radiation resistance. The 40-fold doxorubicin resistant subline 8226/Dox40 was found to be crossresistant to single doses of 4 and 8 Gy of radiation. A genome-wide mRNA expression study comparing the 8226/Dox40 cell line to its parental line was performed to identify the underlying molecular mechanisms. Seventeen of the top 50 overexpressed genes have previously been implicated in the STAT1 signaling pathway. STAT1 was over expressed both at the mRNA and protein level. Moreover, analyses of nuclear extracts showed higher abundance of phosphorylated STAT1 (Tyr 701) in the resistant subline. Preexposure of the crossresistant cells to the STAT1 inhibiting drug fludarabine reduced expression of overexpressed genes and enhanced the effects of both doxorubicin and radiation. These results show that resistance to doxorubicin and radiation is associated with increased STAT1 signaling and can be modulated by fludarabine. The data support further development of therapies combining fludarabine and radiation.

2007-01-10 | E-BASE-2 | biostudies-arrayexpress

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