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Gene expression at single cell level of untreated and 10 day palbociclib treated LS8817 cells

ABSTRACT: Gene expression at single cell level of untreated and 10 day palbociclib treated LS8817 cells

PROVIDER: PRJNA1006751 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25691521.fastq.gz	Fastqsanger.gz
	SRR25691522.fastq.gz	Fastqsanger.gz
	SRR25691523.fastq.gz	Fastqsanger.gz
	SRR25691524.fastq.gz	Fastqsanger.gz

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Gene expression at single cell level of untreated and 10 day palbociclib treated LS8817 cells

Project description:Orthoganally complementing our RNA-seq (GSE241031) efforts to define transcriptional changes over time in LS8817(TetOnFMDM2) cells as they progressed from quiesence to senescence, we chose to look at gene expression in unperturbed parental and 10 day palbociclib treated LS8817 parental cells

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Gene expression profiles between the palbociclib monotherpy versus palbociclib alternating with ICI182,780 treatment in breast cancer cells at 10 weeks.

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Transcriptomic expression of A549 CDK2 KO cells treated or untreated with palbociclib

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Transcriptomic expression of A549 CDK2 KO cells treated or untreated with palbociclib

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Expression data from xenograft in BALB/c 6-wk-old nude mice with PC3 prostate cancer cells stably expressing PML or a vector control after treatment of the mice with palbociclib

Project description:Expression data from xenograft in BALB/c 6-wk-old nude mice with PC3 prostate cancer cells stably expressing PML or a vector control after treatment of the mice with palbociclib (100mg/kg/day diluted in sodium lactate 50mM pH4 given by gavage) during 5 consecutive days PML plays a role in the senescence tumor suppressor response of normal cells to oncogenic stress. PML also mediates therapy-induced senescence in acute promyelocytic leukemia cells after treatment with retinoic acid. However, many tumor cell lines fail to engage a complete senescence response to PML activation. Interestingly, in vivo and in vitro combination of PML overexpression with CDK inhibition induce senescence in PC3 prostate cancer cells. We used microarray to characterize the gene expression profile of PC3 stably expressing PML or a control vector after subcutaneous injection in BALB/c 6-wk-old nude mice and treatment of the mice with palbociclib (100mg/kg/day) during 5 consecutive days.. PC3 cells were infected with a retroviral vector that express PML or an empty vector before subcutaneous injection of 10^6 cells in both flanks of BALB/c 6-wk-old nude mice. Then, mice were treated for 5 consecutive days with palbociclib (100mg/kg/day diluted in sodium lactate 50mM pH4 given by gavage)

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Gene expression profiles between the palbociclib monotherpy versus palbociclib alternating with ICI182,780 treatment in breast cancer cells at 10 weeks.

Project description:Gene expression profiles between the palbociclib monotherpy versus palbociclib alternating with ICI182,780 treatment in breast cancer cells at 10 weeks.

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Project description:RNA-seq was performed to compare the transcriptional programmes of A375 cells treated with Palbociclib or GSK3326595 compared to untreated cells Cyclin dependent kinase 4/6 (CDK4/6) inhibitors are an established treatment in estrogen receptor positive breast cancer and are currently in clinical development in melanoma; a tumour that exhibits high rates of CDK4 activation. We analyzed melanoma cells with acquired resistance to the CDK4/6 inhibitor palbociclib, and demonstrated that palbociclib-mediated inhibition of PRMT5 is essential for sensitivity to CDK4/6 inhibitors. Mechanistically, by inhibiting PRMT5 activity, palbociclib alters MDM4 pre-mRNA splicing leading to decreased MDM4 protein expression and subsequent p53 activation. In turn, p53 increases p21 leading to inhibition of CDK2, the main kinase substituting for CDK4/6 and a key driver of resistance to palbociclib. Loss of the ability of palbociclib to regulate the PRMT5-MDM4 axis leads to resistance. Importantly, combining palbociclib with the PRMT5 inhibitor GSK3326595 enhances the efficacy of palbociclib in treatment naïve and resistant models and also delays the emergence of resistance. Our studies have uncovered a novel mechanism of action of CDK4/6 inhibitors in regulating the MDM4 oncogene and the tumor suppressor, p53. Furthermore, we have established that palbociclib inhibition of the PRMT5-MDM4 axis is essential for robust melanoma cell sensitivity and provide pre-clinical evidence that co-inhibition of CDK4/6 and PRMT5 is an effective and well tolerated therapeutic strategy. Overall our data provides a strong rationale for further investigation of novel combinations of CDK4/6 and PRMT5 inhibitors in not only melanoma but other tumour types including breast, pancreatic and esophageal carcinoma.

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TUMOUR KINOME RE-WIRING GOVERNS RESISTANCE TO PALBOCICLIB IN OESTROGEN RECEPTOR POSITIVE BREAST CANCERS, HIGHLIGHTING NEW THERAPEUTIC MODALITIES

Project description:Estrogen receptor positive (ER+) breast cancers are the most common type of breast cancer. Despite the great efficacy of endocrine therapies, resistance remains a problem. Therefore, there is an immediate need for new, effective therapies in ER+ BC. In this study, we have explored the role of a potent CDK4/6 inhibitor called palbociclib. In order to identify differential phosphoproteomic events that underpin the mode of action and recurrence for this treatment, we generated a panel of palbociclib-sensitive and resistant cell lines and did quantitative, shotgun phosphoproteomics using titanium IMAC. Palbociclib sensitive cell lines (wt-MCF7 or MCF7-LTED) were cultured in phenol red-free RPMI supplemented with 10% FBS and 1nM estradiol or 10% dextran-coated charcoal (DCC) respectively. Thereafter, palbociclib resistant cell lines were generated using 1μΜ palbociclib concentration. Samples were harvested at baseline and at the point of resistance.

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Gene expression alterations associated with acquired-resistance to the CDK4/6 inhibitor palbociclib [Palbociclib resistance_RNASeq]

Project description:RNA-seq was performed to compare the transcriptional programmes of palbociclib-resistant A375 and CHL1 cells compared to their parental counterparts Cyclin dependent kinase 4/6 (CDK4/6) inhibitors are an established treatment in estrogen receptor positive breast cancer and are currently in clinical development in melanoma; a tumour that exhibits high rates of CDK4 activation. We analyzed melanoma cells with acquired resistance to the CDK4/6 inhibitor palbociclib, and demonstrated that palbociclib-mediated inhibition of PRMT5 is essential for sensitivity to CDK4/6 inhibitors. Mechanistically, by inhibiting PRMT5 activity, palbociclib alters MDM4 pre-mRNA splicing leading to decreased MDM4 protein expression and subsequent p53 activation. In turn, p53 increases p21 leading to inhibition of CDK2, the main kinase substituting for CDK4/6 and a key driver of resistance to palbociclib. Loss of the ability of palbociclib to regulate the PRMT5-MDM4 axis leads to resistance. Importantly, combining palbociclib with the PRMT5 inhibitor GSK3326595 enhances the efficacy of palbociclib in treatment naïve and resistant models and also delays the emergence of resistance. Our studies have uncovered a novel mechanism of action of CDK4/6 inhibitors in regulating the MDM4 oncogene and the tumor suppressor, p53. Furthermore, we have established that palbociclib inhibition of the PRMT5-MDM4 axis is essential for robust melanoma cell sensitivity and provide pre-clinical evidence that co-inhibition of CDK4/6 and PRMT5 is an effective and well tolerated therapeutic strategy. Overall our data provides a strong rationale for further investigation of novel combinations of CDK4/6 and PRMT5 inhibitors in not only melanoma but other tumour types including breast, pancreatic and esophageal carcinoma.

2019-08-23 | GSE133567 | GEO

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