NOTCH-mediated non-cell autonomous regulation of chromatin structure during senescence [ATAC-Seq]
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE103588 | GEO | 2018/04/24
REPOSITORIES: GEO
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Project description:We describe the accessible chormatin landscape in RAS-induced (RIS) and NOTCH induced senescence (NIS) using ATAC-seq. By expressing active NOTCH (N1ICD) in the context of RIS, we find that N1ICD antagonizes the formation of accessible regions in RIS. By performing co-cultures, we demonstrate that cells expressing a NOTCH1 ligand, JAGGED1, can antagonize the formation of RIS specific accessible regions. Many of these accessible regions form at enhancers, characterised using ChIP-seq against H3K4me1 and H3K27Ac
2018-04-24 | GSE103589 | GEO
Project description:We decribe the accessible chormatin landscape in RAS-induced (RIS) and NOTCH induced senescence (NIS) using ATAC-seq. By expressing active NOTCH (N1ICD) in the context of RIS, we find that N1ICD antagonises the formation of accessible regions in RIS. By performing co-cultures, we demonstrate that cells expressing a NOTCH1 ligand, JAGGED1, can antagonise the formation of RIS specific accessible regions.
2018-04-24 | GSE113060 | GEO
Project description:ER:RAS-G12V expressing IMR90 cells were transduced with N1ICD-containing or control vectors before treatment with either 100nM 4-OHT or vehicle for 6 days leading to Notch-induced senescence (NIS), RAS-induced senescence (RIS) or combined Notch and Ras-induced senescence (RNIS).
2016-06-22 | GSE72404 | GEO
Project description:To further investigate the mechanism how the decline in Notch signaling induces premature senescence in endothelial cells, we performed microarray analysis and identified Id1 nd DUSP1 as the downstream molecules of Notch pathway. In quantitative PCR and western blot analyses, the expression level of Id1 and DUSP1 increased in Notch1 over-expressing endothelial cells and decreased in knockdown similar to the result of microarray. The gene expression of human unbilical endothelial vein cells (HUVEC) infected with retroviral vectors encoding Jagged1, Jagged1-shRNA, or Notch1-shRNA. HUVEC infected with empty vector was used as a control. In each genotypes, three independent lines at passage 8 were performed.
2012-08-28 | E-GEOD-40403 | biostudies-arrayexpress
Project description:The Notch signaling system links cellular fate to that of its neighbors, driving proliferation, apoptosis, and cell differentiation in metazoan organisms, whereas dysfunction leads to debilitating developmental disorders and cancers. Here we probe the molecular architecture of mammalian Notch1 full ectodomain in complex with the canonical ligand Jagged1 using cross-linking mass spectrometry (XL-MS). Our data reveals that three Jagged1 sites, C2-epidermal growth factor (EGF) 1, EGF10 and cysteine-rich domain (CRD), are in proximity to the Notch1 negative regulatory region (NRR) in the Notch1-Jagged1 full ectodomain complex. We verified direct interactions and identified additional interacting regions by quantitative-binding experiments. In addition, XL-MS and structural analysis reveal Notch1 and Jagged1 ectodomain intramolecular interactions and structural flexibility that support the formation of backfolded architectures. Together the data suggest a direct and intricate role for the different extracellular regions of Notch1 and Jagged1 in the activation and regulation of Notch1 signaling.
2021-07-08 | PXD023072 | Pride
Project description:Aim: To determine the role of NOTCH during the response-to-injury and subsequent chronic inflammatory process of the arterial wall underlying atherosclerosis. Methods and results: We have generated an endothelial-specific RBPJK depleted mice using the Cdh5 cadherin promoter (ApoE-/-;RBPJflox/flox;Cdh5- CreERT). Endothelial-specific deletion of the Notch effector RBPJK or systemic deletion of the Notch1 receptor in athero-susceptible ApoE-/- mice fed a HC diet for 6 weeks resulted in reduced atherosclerosis in the aortic arch and sinus. Intravital microscopy revealed decreased leukocyte rolling on the endothelium of ApoE-/-;RBPJflox/flox;Cdh5- CreERT, that correlated with the lesser presence of leukocyts and macrophages in the vascular wall. Consistent with this, transcriptome analysis revealed that proinflammatory and endothelial activation pathways were downregulated in atherosclerotic tissue of RBPJk-mutant mice.. Jagged1 signaling upregulation in endothelial cells promotes the physical interaction and nuclear translocation of the intracellular domain of the Notch1 receptor (N1ICD) with NF-kB,. This N1ICD and NF-kB interaction is required for reciprocal transactivation of target genes including vascular cell adhesion molecule-1 (Vcam1). Conclusions: Notch signaling pathway inactivation decreases leukocyte rolling, thereby preventing endothelial dysfunction and vascular inflammation. Thus attenuating Notch signaling may constitute a useful therapeutic strategy for atherosclerosis. Key words: atherosclerosis, endothelium, signaling pathways, Notch, NF-kB, transcriptional regulation
2017-06-30 | GSE69376 | GEO
Project description:Objective Notch signaling is re-activated in β cells from obese mice, and is causal to β cell dysfunction. Notch activity is determined in part by expression of transmembrane ligand availability in a neighboring cell. We hypothesized that β cell expression of Jagged1 determines the maladaptive Notch response and resultant β cell dysfunction in obese mice. Methods We assessed expression of Notch pathway components in diet-induced obese (DIO) or leptin receptor-deficient (db/db) mice, and performed single cell RNA sequencing (scRNAseq) in islets from patients with and without type 2 diabetes (T2D). We generated and performed glucose tolerance testing in inducible, β cell-specific Jagged1 gain-of- and loss-of-function mice. We also tested effects of monoclonal neutralizing antibodies to Jagged1 in glucose-stimulated insulin secretion (GSIS) assays in isolated islets. Results Jag1 was the only Notch ligand that tracked with increased Notch activity in DIO and db/db mice. Consistently, JAG1 tracked with Notch activity in metabolically inflexible β cells enriched in patients with T2D. Neutralizing antibodies to block Jagged1 in islets isolated from DIO and db/db mice potentiated GSIS ex vivo. To demonstrate if β cell Jagged1 is sufficient to cause glucose tolerance in vivo, we generated inducible β cell-specific Jag1 transgenic mice (β-Jag1TG), which showed impaired glucose intolerance due to reduced GSIS. However, β cell-specific Jagged1 loss-of-function (β-Jag1KO) did not protect against HFD-induced insulin secretory defects or glucose intolerance. Conclusions Jagged1 is increased in islets from obese mice and in patients with T2D, and neutralizing Jagged1 antibodies lead to improved GSIS, suggesting that inhibition of Jagged1-Notch signaling may have therapeutic benefit. However, genetic loss-of-function experiments suggest that β cells are not a likely source of the Jagged1 signal.
2024-02-23 | GSE249170 | GEO
Project description:We analyzed specific genes for DNA copy number variation in hepatoma cells and investigated whether these factors are related to liver cancer phenotype. Chromosome 20p, which includes the ligand for Notch pathways, Jagged1, was found to be amplified in several types of hepatoma cells. In conclusion, amplification of Jagged1 contributed to mRNA expression that activates the Jagged1-Notch signaling pathway in liver cancer and led to poor outcome.
2016-02-04 | GSE77224 | GEO
Project description:We analyzed specific genes for DNA copy number variation in hepatoma cells and investigated whether these factors are related to liver cancer phenotype. Chromosome 20p, which includes the ligand for Notch pathways, Jagged1, was found to be amplified in several types of hepatoma cells. In conclusion, amplification of Jagged1 contributed to mRNA expression that activates the Jagged1-Notch signaling pathway in liver cancer and led to poor outcome. Comparative genomic hybridization arrays spotted with 1,440 bacterial artificial chromosome clones were used to assess copy number changes in 7 hepatoma cell lines and 2 non-hepatoma cell lines to identify chromosomal regions associated with the pathogenesis of liver cancer.
2016-02-04 | E-GEOD-77224 | biostudies-arrayexpress
Project description:Breast cancer is one of the leading causes of cancer-related mortality in women. NOTCH signaling is a well conserved pathway which not only plays critical roles in normal development, but also in cancer progression. One of the Notch ligand, JAGGED1 is overexpressed in about 30% of breast cancer patients. However, the role of JAGGED1 in breast tumorigenesis has not been rigorously examined. By utilizing genetic engineered mouse models of mammary specific Jagged1 expression or knockout, we discover that Jagged1 promotes tumorigenesis in multiple spontaneous mammary tumor models. Jagged1 expression leads to increased infiltration of tumor associated macrophages and decreased presentation of T cells within tumor microenvironment. Depletion of macrophages or T cells by neutralizing antibodies diminishes the tumor-promoting effect caused by Jagged1. Mechanistically, Jagged1 activates Notch signaling in tumor cells, leads to increased expression and secretion of multiple cytokines, including IL-6 and WISP. These cytokines help recruit macrophages into the tumor microenvironment. Macrophages crosstalk with infiltrated T cells and inhibit their cytotoxic killing on tumor cells. In triple negative breast cancer patient samples, high expression level of JAGGED1 correlates with increased macrophage infiltration and decreased T cell infiltration within tumor tissues. JAGGED1 also promotes tumor progression in several other solid cancer types, including melanoma, and colon cancer in a T cell dependent manner. Co-administration of immune checkpoint inhibitor, PD-1 antibody with gamma-secretase inhibitor (GSI) significantly inhibits tumor growth. These findings identify a unique oncogenic crosstalk between tumor derived JAGGED1, Macrophages, and T cells to promote tumor progression.
2022-03-08 | GSE161768 | GEO