Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA146097 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:The mucin MUC4 and its membrane partner the ErbB2 oncogenic receptor are potential actors and partners in pancreatic tumourigenesis. However, the way they function is still largely unknown. We thus undertook in this work to identify the cellular mechanisms and the intracellular signalling pathways under the control of both ErbB2 and MUC4. Using co-immunoprecipitation, we show that MUC4 and ErbB2 interact in the human pancreatic adenocarcinomatous cell line CAPAN-2. Stable Knocked-Down (KD) cellular clones for both MUC4 and ErbB2 were raised by a shRNA approach. Biological properties of these cells were then studied in vitro and in vivo. Our results show that ErbB2-KD cells are more apoptotic and less proliferative (decreased cyclin D1 and increased p27kip1 expression) while migration and invasive properties were not altered. MUC4-KD clones were less proliferative with decreased cyclin D1 expression, G1 cell cycle arrest and altered ErbB2/ErbB3 expression. Their migration properties were reduced whereas invasive properties were increased. Importantly, inhibition of ErbB2 and MUC4 expression did not impair the same signalling pathways (inhibition of MUC4 expression affected the JNK pathway whereas that of ErbB2 altered the MAPK pathway). Finally, ErbB2-KD and MUC4-KD cells showed impaired tumour growth in vivo. This indicates that ErbB2 and MUC4, that physically interact, activate different intracellular signalling pathways to regulate biological properties of pancreatic cancer cells. Altogether, these data bring new information regarding molecular mechanisms under the control of both MUC4 and ErbB2 that will have to be taken into account for developing efficient targeting of both proteins in order to slow down/stop pancreatic tumourigenesis. profiling of pancreatic cells depleted for ErbB2 and MUC4
2012-03-20 | E-GEOD-31322 | biostudies-arrayexpress
Project description:The mucin MUC4 and its membrane partner the ErbB2 oncogenic receptor are potential actors and partners in pancreatic tumourigenesis. However, the way they function is still largely unknown. We thus undertook in this work to identify the cellular mechanisms and the intracellular signalling pathways under the control of both ErbB2 and MUC4. Using co-immunoprecipitation, we show that MUC4 and ErbB2 interact in the human pancreatic adenocarcinomatous cell line CAPAN-2. Stable Knocked-Down (KD) cellular clones for both MUC4 and ErbB2 were raised by a shRNA approach. Biological properties of these cells were then studied in vitro and in vivo. Our results show that ErbB2-KD cells are more apoptotic and less proliferative (decreased cyclin D1 and increased p27kip1 expression) while migration and invasive properties were not altered. MUC4-KD clones were less proliferative with decreased cyclin D1 expression, G1 cell cycle arrest and altered ErbB2/ErbB3 expression. Their migration properties were reduced whereas invasive properties were increased. Importantly, inhibition of ErbB2 and MUC4 expression did not impair the same signalling pathways (inhibition of MUC4 expression affected the JNK pathway whereas that of ErbB2 altered the MAPK pathway). Finally, ErbB2-KD and MUC4-KD cells showed impaired tumour growth in vivo. This indicates that ErbB2 and MUC4, that physically interact, activate different intracellular signalling pathways to regulate biological properties of pancreatic cancer cells. Altogether, these data bring new information regarding molecular mechanisms under the control of both MUC4 and ErbB2 that will have to be taken into account for developing efficient targeting of both proteins in order to slow down/stop pancreatic tumourigenesis.
2012-03-20 | GSE31322 | GEO
Project description:Pancreatic ductal adenocarcinoma (PDAC) remains among the most lethal of human cancers underscoring the need to identify new therapeutic vulnerabilities. Previously, we reported high expression of transcriptional co-regulators C-terminal binding proteins (CtBP) 1 and 2 in human PDAC, however their precise role in PDAC formation or progression remains unclear. Here, we have studied PDAC tumor dependency on CtBPs for growth and metastasis using an orthotopic syngeneic pancreatic tumor mouse model. CRISPR-based homozygous deletion of Ctbp2 dramatically decreased PDAC tumor growth, drastically reduced metastatic potential, and significantly prolonged survival. Interrogating differential gene expression of the orthotopic PDAC tumors from CtBP2 WT vs. CtBP2 KO cohorts, we identified significant downregulation of the EGFR-superfamily receptor ErbB3 in CtBP2 KO tumors, and further determined that CtBP regulates expression of both the ErbB2 and 3 EGFR superfamily genes in PDAC cells. We therefore hypothesized that CtBP regulation of physiologic ErbB2/3 signaling contributes, in part, to PDAC growth and metastasis. Indeed, we observed that CtBP2 KO cells exhibited severely attenuated activation of phospho-Akt after neuregulin stimulation of ErbB2/3, and we demonstrate that human PDAC cells also show CtBP dependence of ErbB2/3 expression. Our results suggest that a subset of PDAC tumors is dependent on physiologic ErbB2/3 signaling and could be targeted by pharmacologic inhibitors of ErbB2 and/or ErbB3. Providing proof of concept, the ErbB2-targeted multikinase inhibitor lapatinib, but not the ErbB1/EGFR targeted agent erlotinib, effectively killed ErbB3 expressing PDAC cells, while CtBP2 KO cells where ErbB3 expression was extinguished, were resistant to lapatinib. Taken together, our data suggests that ErBb2/3 targeted therapeutics can effectively target a critical PDAC dependency on physiologic ErbB2/3 signaling which is the result of CtBP’s oncogenic transcriptional program that drives PDAC tumor progression.
2023-11-10 | GSE228625 | GEO
Project description:Pancreatic ductal adenocarcinoma is a recalcitrant tumor with minimal response to conventional chemotherapeutic approaches. Oncogenic signaling by activated tyrosine kinases has been implicated in cancers resulting in activation of diverse effector signaling pathways. Thus, discovery of aberrantly activated tyrosine kinases is of great interest in developing novel therapeutic strategies in treatment and management of pancreatic cancer. Patient-derived tumor xenografts (PDXs) in immunodeficient mice serve as potentially valuable preclinical model as it maintain the histological and molecular heterogeneity of the progenitor human tumor. Here, we employed high resolution mass spectrometry combined with immuno-affinity purification using anti-phosphotyrosine antibodies to profile tyrosine phosphoproteome across 13 pancreatic ductal adenocarcinoma PDX models. This analysis resulted in identification of 1,219 tyrosine phosphorylated sites mapping on 724 proteins. The mass spectrometric analysis revealed widespread and heterogeneous activation of both receptor and non-receptor tyrosine kinases. Studies carried out in mice confirmed ephrin type-B receptor 4 (EphB4) as a potential therapeutic target based on the efficacy of human serum albumin-conjugated soluble EphB4 in mice bearing orthotopic xenografts. In summary, we present the comprehensive landscape of tyrosine phosphoproteome with EphB4 as a promising therapeutic target in pancreatic ductal adenocarcinoma.
2021-05-24 | PXD021729 | Pride
Project description:One potential approach to restore hearing is to enforce regeneration of hair cells (HCs) through induction of cellular signaling pathways in supporting cells (SCs) that promote dedifferentiation and proliferation. We previously showed that the constitutive activation of ERBB2 signaling in cochlear SCs indirectly promoted SC differentiation to HCs, both in vivo and in vitro. In the current study, we aimed at identifying mechanisms and molecular pathways activated in SCs with constitutive ERBB2 signaling. To this end, we used single cell RNA sequencing (scRNA-seq) to characterize the transcriptomes of individual neonatal mouse cochlear SCs that were induced to express ERBB2. We found that induction of ERBB2 in vivo resulted in generation of a new distinct cluster of cells with unique transcriptome. This population has de novo expression of two members of the small integrin-binding ligand n-linked glycoproteins (SIBLING) family and their regulators. We confirm expression of the SIBLING Secreted phosphoprotein 1 (SPP1) as one of the most up-regulated genes in response to ERBB2 activation. SPP1 mediates signaling through the CD44 receptor, promoting survival, proliferation, and differentiation of osteoblast lineage cells. Histological analyses of cochlear samples collected from young adult mice confirmed that induction of ERBB2 after noise exposure resulted in up-regulation of both SPP1 and its receptor CD44, and the formation of mitotic sensory stem-like cell aggregates in the organ of Corti. Our results suggest that ectopic activation of ERBB2-signaling in young adult mice secondarily promotes SPP1/CD44 signaling, possibly altering the microenvironment of the organ of Corti.
2022-12-13 | GSE202850 | GEO
Project description:Janus kinases (JAKs) and their downstream STAT proteins play key roles in cytokine signaling, tissue homeostasis, and cancer development. Using a novel breast cancer model that conditionally lacks the Janus kinase 1, we show here that JAK1 is essential for IL-6 class inflammatory cytokine signaling and plays a critical role in metastatic cancer progression. JAK1 is indispensable for the oncogenic activation of STAT1, STAT3, and STAT6 in ERBB2-expressing cancer cells, suggesting that ERBB2 receptor tyrosine kinase complexes do not directly activate these STAT proteins in vivo. A genome-wide gene expression analysis revealed that JAK1 signaling has pleiotropic effects on several pathways associated with cancer progression. We established that FOS and MAP3K8 are targets of JAK1/STAT3 signaling that promote tumorsphere formation and cell migration. The results highlight the significance of JAK1 as a rational therapeutic target to block IL-6 class cytokines that are master regulators of cancer-associated inflammation.
2019-03-27 | GSE121064 | GEO
Project description:We conducted RNA-seq analysis of vector (control), SLC22A10_OE and SLC22A15_OE clones to identify any SLC22-specific oncogenic alterations associated with pancreatic cancer progression. Our findings demonstrate substantial activation of key regulators of epithelial-mesenchymal transition (EMT), cancer cell invasion, and drug resistance such as receptor tyrosine kinase like orphan receptor 1 (ROR1) and aldehyde dehydrogenase 1A1 (ALDH1A1) along with enrichment of interferon alpha and gamma signaling pathways in SLC22A10_ and SLC22A15_OE clones compared to the vector clone.
2021-05-31 | GSE155909 | GEO
Project description:Receptor tyrosine kinase (RTK) signaling plays a key role in the development of breast cancer. Defining the genes and pathways in the RTK signaling network that are important regulators of tumorigenesis in vivo will unveil potential candidates for targeted therapeutics. To this end, we utilized microarray comparative genomic hybridization (array CGH) to identify and compare copy number aberrations in 5 mouse models of breast cancer induced by wild-type and mutated forms of oncogenic ErbB2 or the polyomavirus middle T antigen (PyMT). We observed distinct genomic alterations amongst the various models including recurrent chromosome 11 amplifications and chromosome 4 deletions, respectively syntenic with human 17q21-25 and 1p35-36. Expression of oncogenic Erbb2 (NeuNT) under control of the endogenous ErbB2 promoter results in frequent (85%) amplification at the Erbb2 locus with striking structural similarity to the human amplicon, resulting in overexpression of at least 2 of the genes, ErbB2 and Grb7. Chromosome 11 amplicons distal to Erbb2 arise in a model (DB) over expressing a mutant variant of PyMT (Y315/322F) unable to activate PI3K. These amplicons are not observed in DB hyperplasias or in tumors over expressing wild type PyMT, and result in over expression of Grb2 and Itgb4. Distal chromosome 4 deletions occur in a significantly higher proportion of Erbb2 than PyMT tumors and encompass 14-3-3 sigma (Sfn), which is expressed at low or undetectable levels in the majority of TM tumors. Our studies highlight loci and genes important in the regulation of tumorigenic RTK signaling in mammary epithelial cells in vivo. Keywords: Comparative Genomic Hybridization
2005-09-13 | GSE3012 | GEO
Project description:A variety of mechanotransduction forces are altered in the tumor microenvironment (TME) and these biophysical forces can influence cancer progression. One such force is interstitial fluid flow (IFF) - the movement of fluid through the tissue matrix. IFF was previously shown to induce invasion of cancer cells, but the activated signaling cascades remain poorly understood. Here, it is demonstrated that IFF induces invasion of ERBB2/HER2 expressing breast cancer cells via activation of phosphoinositide-3-kinase (PI3K). In constitutively activate ERBB2 expressing cells that have undergone epithelial-to-mesenchymal transition (EMT), IFF-mediated invasion requires the chemokine receptor CXCR4, a gradient of its ligand CXCL12, and activity of the PI3K catalytic subunits p110a and ?. In wild-type ERBB2 expressing cells, IFF-mediated invasion is chemokine receptor-independent and requires only p110a activation. To test whether cells undergoing EMT alter their signaling response to IFF, TGFb1 was used to induce EMT in wild-type ERBB2-expressing cells resulting in IFF-induced invasion dependent on CXCR4 and p110?. 2 cell lines (NeuN, NeuT), 2 conditions (flow, static), 3 replicates each, 12 samples total
2015-01-06 | E-GEOD-64670 | biostudies-arrayexpress
Project description:GNAS, a gene encoding G-protein stimulating alpha subunit, is frequently mutated in intraductal papillary mucinous neoplasms (IPMNs), which is an indolent and slow-growing pancreatic neoplasm that secretes abundant mucin. GNAS mutation is not observed in conventional ductal adenocarcinomas of the pancreas. To determine the functional significance of GNAS mutation in pancreatic ductal cells, we examined in vitro phenotypes and gene expression profiles of cells of pancreatic ductal lineage, HPDE, PK-8, PCI-35, and MIA PaCa-2, with exogenous expression of either wild-type or mutated (R201H) GNAS. We found that exogenous GNAS upregulated intracellular cyclic-adenine monophosphate, particularly in the mutated GNAS transfectants. Exogenous GNAS induced no obvious cell-growth promotion, but induced suppression in some cells. The exogenous GNAS upregulated MUC2 and MUC5AC in HPDE and PK-8, and the latter was most sensitive to exogenous GNAS, exhibiting drastic alteration of the global gene expression that is consistent with that of IPMN. Hence, PK-8 expressing exogenous mutated GNAS may be an ideal in vitro model of IPMN. On the other hand, exogenous GNAS downregulated expression of mucin genes and produced modest alteration of gene expression profiles in PCI-35 and MIA PaCa-2, indicating lower sensitivity to exogenous GNAS. Furthermore, we showed diverse and cell-type specific mucin expression pathways with complicated interactions between signaling pathways of the G-protein coupled receptor (GPCR), the mitogen-activated protein kinase (MAPK), and the phosphatidylinositol 3 kinase (PI3K), in which the GPCR pathway appeared to be dominant in some and the MAPK pathway in others. In conclusion, mutated GNAS found in IPMNs may extensively alter gene expression profiles, including expression of mucin genes, with the interaction with MAPK and PI3K pathways in pancreatic ductal-lineage cells, which may determine the characteristic phenotype of the neoplasm.
2014-02-04 | GSE53350 | GEO