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Genowide analysis of H2Aub level upon glucose deprivation

ABSTRACT: Genowide analysis of H2Aub level upon glucose deprivation

PROVIDER: PRJNA573710 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10166200.fastq.gz	Fastqsanger.gz
	SRR10166193.fastq.gz	Fastqsanger.gz
	SRR10166194.fastq.gz	Fastqsanger.gz
	SRR10166195.fastq.gz	Fastqsanger.gz
	SRR10166196.fastq.gz	Fastqsanger.gz

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Genowide analysis of H2Aub level upon glucose deprivation

Project description:The role of H2A monoubiquitination at K119 in regulating gene expression and cellular function upon glucose deprivation is unknown. Here, we conducted ChIP-seq for UMRC6 cells cultured with or without glucose for 8 hours using primary antibody against H2Aub. Genes with deregulated H2Aub level under glucose starvation condition were particular of interest.

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The vulnerability of actin cytoskeleton to disulfide stress dictates high SLC7A11-driven cell death upon glucose deprivation

Project description:Solute carrier family 7 member 11 (SLC7A11; also known as xCT) is a cystine transporter frequently overexpressed in cancers. Cancer cells with high expression of SLC7A11 (SLC7A11high) are resistant to ferroptosis but exquisitely sensitive to glucose deprivation-induced cell death, although the underlying mechanism of the latter cell death remains poorly understood. Here we show that We found that glucose deprivation induced a novel type of cell death in SLC7A11high cancer cells that was different from apoptosis or ferroptosis. And the bioorthogonal chemical proteomics analysis revealed that a large amount of actin cytoskeleton proteins were shown with significantly dysregulated disulfides induced by glucose starvation in SLC7A11high cancer cells. In mechanism, SLC7A11high mediated cystine uptake and subsequent reduction to cysteine forced disulfide stress on actin cytoskeleton upon glucose deprivation through draining intracellular reduced nicotinamide adenine dinucleotide phosphate (NADPH) pool, which was independent of generating reactive oxygen species (ROS). The disulfide stress on the actin cytoskeleton induced rapidly contracted actin filaments and detached from the plasma membrane, which incurred cell death. In the end, using whole-genome CRISPR/Cas9 knock-out screening we identified NCKAP1 as a downstream factor of SLC7A11 to promoting cell death upon glucose deprivation by inhibiting branched actin filaments.

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Project description:We investigated the function of the mTORC1 substrates and mRNA translation regulators 4EBP1/2 in the response to glucose deprivation. We uncovered that targeting 4EBP1/2 expression had a direct impact on the survival rates of cells challenged with glucose deprivation. To further define the mechanisms underlying 4EBP1/2 function under glucose deprivation, we conducted a proteomics analysis of HEK293 shRNA control and HEK293 shRNA 4EBP1/2 grown in basal media or under glucose deprivation (1 mM glucose containing media) for 30 hours.

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Project description:This microarray experiment was designed to identify genes and pathways modulated in glucose deprivation resistant (GDR) and glucose deprivation sensitive (GDS) clones of ovarian cancer xenografts. Tumors were established in NOD/SCID mice by s.c. injection of human ovarian cancer cells (IGROV-1 and SKOV3). After sacrifice GDR and GDS clones were obtained from ex vivo cultures of tumors. Once isolated, GDR and GDS clones were cultivated in normal-glucose (0h) or low-glucose condition (6 h and 24 h). Two different time points were selected to investigate both early (6 h) and late (24 h) transcriptional effects of glucose deprivation in IGROV-1 and SKOV3-derived clones. Total RNA was extracted from samples and hybridized on Affymetrix GeneChip™ PrimeView™ Human Gene Expression Arrays. Based on assessment of RNA quality and on quality control analyses (including MAplots and boxplots), only one sample, corresponding to GDR condition at 6 h of glucose deprivation in SKOV3 model, was excluded because it was deemed not suitable for data analysis. In order to evaluate the effects of glucose deprivation in the two models, expression data of IGROV-1 and SKOV3-derived GDR and GDS clones were normalized and analyzed separately. Raw microarray data and pre-processed data matrices are available together with the applied protocols. Results of differential expression analysis are provided as supplementary tables of the associated publication.

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