Effect of depletion of Notch signaling genes in C2C12 cells on the activation of Notch pathway activity in response to stimulation by plated ligand
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE233573 | GEO | 2023/06/02
REPOSITORIES: GEO
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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:Taxanes are widely used in chemotherapy, but intrinsic and acquired resistance limit the clinical outcomes. Studies showed tumor interaction with suppressive macrophages plays a key role in taxane resistance, yet therapeutic strategies that deplete or repolarize macrophages are challenging. Here we uncovered a novel tumor-macrophage interaction via Notch2-Jag1 justacrine signaling that can be targeted to sensitize paclitaxel response without affecting the broad macrophage functions. Using translatome profiling, we identified Notch2 upregulation during taxol-induced prolonged mitosis. Notch2 was subsequently activated in the post-mitotic G1 phase by Jag1 expressed on neighboring macrophages, which promoted tumor cell survival by upregulating p38 and anti-apoptotic proteins. Notch2 also upregulated cytokines that further recruited Jag1-expressing macrophages. By targeting this Notch2-Jag1 interaction with a pan-Notch inhibitor, RO4929097, taxol resistance was significantly attenuated in multiple mouse tumor models. Our results point to combining Notch inhibitor with taxane as an effective strategy to selectively disrupt tumor-macrophage interaction underlying chemoresistance.
2021-06-29 | GSE158569 | GEO
Project description:Vascular morphogenesis requires a delicate gradient of Notch signaling that is controlled, at least in part, by the distribution of ligands (Dll4 and Jagged1). How jagged1 (JAG1) expression is compartmentalized in the vascular plexus remains unclear. Here we showed that Jag1 mRNA is a direct target of zinc finger protein 36 (ZFP36), an RNA-binding protein involved in mRNA decay that we found robustly induced by VEGF. Endothelial cells lacking ZFP36 displayed high levels of JAG1 and increased angiogenic sprouting in vitro. Similarly, mice lackingZfp36in endothelial cells display mispatterned and increased levels of JAG1 in the developing retinal vascular plexus. Abnormal levels of JAG1 at the sprouting front altered NOTCH1 signaling, increasing the number of tip cells; a phenotype that was rescued by imposing haploinsufficiency ofJag1. Our findings reveal an important feedforward loop, whereby VEGF stimulates ZFP36, consequently suppressing Jag1 to enable adequate levels of Notch signaling during sprouting angiogenesis.
2023-12-04 | GSE235462 | GEO
Project description:ARMMs (arrestin domain-containing protein 1 [ARRDC1]-mediated microvesicles) are extracellular vesicles that bud directly atthe plasma membrane. However, little is known about the physiological function of these vesicles. Here we report that secreted ARMMs contain active NOTCH receptors and mediate a non-canonical intercellular NOTCH signaling. Masss pectrometry of purified ARMMs identifiedNOTCH2 as a protein component of the vesicles. The NOTCH protein in ARMMs contains the critical intracellular region (NICD) that is required for its transcriptional activity in the nucleus. ARRDC1 overexpression increased the NOTCH2 incorporation into ARMMs. Conversely, CRISPR-mediated knockout of ARRDC1 dramatically reduced the amount of NOTCH2 in secreted ARMMs. The incorporation of NOTCH2 into ARMMs is facilitated by the ITCH E3 ligase and ADAM10, which are also secreted into ARMMs. We showed NOTCH2 in ARMMs delivered into recipient cells is further activated by γ-secretase cleavage to induce NOTCH-specific signaling in recipient cells. Together, our findings revealed a role for ARMMs in a novelNOTCH signaling pathway that acts in distance beyond direct cell-cell contact.
2017-10-11 | PXD006416 | Pride
Project description:While Notch signaling has been proposed to play a key role in fibrosis, the direct molecular pathways targeted by Notch signaling and the precise ligand and receptor pair that are responsible for kidney disease remain poorly defined. In this study, we found that JAG1 and NOTCH2 showed the strongest correlation with the degree of interstitial fibrosis in a genome wide expression analysis of a large cohort of human kidney samples. Transcript analysis of mouse kidney disease models, including folic-acid-induced nephropathy, unilateral ureteral obstruction, or APOL1-associated kidney disease, indicated that Jag1 and Notch2 levels were higher in all analyzed kidney fibrosis models. Mice with tubule-specific deletion of Jag1 or Notch2 (Kspcre/Jag1flox/flox and Kspcre/Notch2flox/flox) had no kidney-specific alterations at baseline, but showed protection from folic acid induced kidney fibrosis. Tubule-specific genetic deletion of Notch1 and global knock-out of Notch3 had no effect on fibrosis. In vitro chromatin immunoprecipitation experiments and genome-wide expression studies identified the mitochondrial transcription factor A (Tfam) as a direct Notch target. Re-expression of Tfam in tubule cells prevented Notch-induced metabolic and profibrotic reprogramming. Kidney tubule specific deletion of Tfam resulted in fibrosis. In summary, Jag1/Notch2 plays a key role in kidney fibrosis development by regulating Tfam expression and metabolic reprogramming.
2018-12-31 | GSE118600 | GEO
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:Notch signaling is an evolutionarily conserved pathway that functions via direct cell-cell contact. The Notch ligand Jagged1 (Jag1) has been extensively studied in vascular development, particularly for its role in smooth muscle cell maturation. Endothelial cell-expressed Jag1 is essential for blood vessel formation by signaling to nascent vascular smooth muscle cells and promoting their differentiation. Given the established importance of Jag1 in endothelial cell/smooth muscle crosstalk during development, we sought to determine the extent of this communication in the adult vasculature for blood vessel function and homeostasis.
2022-08-01 | GSE209736 | GEO
Project description:Notch signaling relies on ligand-induced proteolysis to liberate a nuclear effector that drives cell fate decisions. The location and timing of individual steps required for proteolysis and movement of Notch from membrane to nucleus, however, remain unclear. Here, we use proximity labeling with quantitative multiplexed mass spectrometry to monitor the microenvironment of endogenous Notch2 after ligand stimulation in the presence of a gamma secretase inhibitor and then as a function of time after inhibitor removal. Our studies show that gamma secretase cleavage of Notch2 occurs in an intracellular compartment and that formation of nuclear complexes and recruitment of chromatin-modifying enzymes occurs within 45 minutes of inhibitor washout. This work provides a spatiotemporal map of unprecedented detail tracking the itinerary of Notch from membrane to nucleus after activation and identifies molecular events in signal transmission that are potential targets for modulating Notch signaling activity.
2023-08-02 | PXD042123 | Pride
Project description:Notch signaling relies on ligand-induced proteolysis to liberate a nuclear effector that drives cell fate decisions. The location and timing of individual steps required for proteolysis and movement of Notch from membrane to nucleus, however, remain unclear. Here, we use proximity labeling with quantitative multiplexed mass spectrometry to monitor the microenvironment of endogenous Notch2 after ligand stimulation in the presence of a gamma secretase inhibitor and then as a function of time after inhibitor removal. Our studies show that gamma secretase cleavage of Notch2 occurs in an intracellular compartment and that formation of nuclear complexes and recruitment of chromatin-modifying enzymes occurs within 45 minutes of inhibitor washout. This work provides a spatiotemporal map of unprecedented detail tracking the itinerary of Notch from membrane to nucleus after activation and identifies molecular events in signal transmission that are potential targets for modulating Notch signaling activity.
2023-07-03 | PXD039010 | Pride
Project description:Notch signaling relies on ligand-induced proteolysis to liberate a nuclear effector that drives cell fate decisions. The location and timing of individual steps required for proteolysis and movement of Notch from membrane to nucleus, however, remain unclear. Here, we use proximity labeling with quantitative multiplexed mass spectrometry to monitor the microenvironment of endogenous Notch2 after ligand stimulation in the presence of a gamma secretase inhibitor and then as a function of time after inhibitor removal. Our studies show that gamma secretase cleavage of Notch2 occurs in an intracellular compartment and that formation of nuclear complexes and recruitment of chromatin-modifying enzymes occurs within 45 minutes of inhibitor washout. This work provides a spatiotemporal map of unprecedented detail tracking the itinerary of Notch from membrane to nucleus after activation and identifies molecular events in signal transmission that are potential targets for modulating Notch signaling activity.
2023-07-03 | PXD039008 | Pride