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Loss of ATM accelerates pancreatic cancer formation and epithelial–mesenchymal transition

ABSTRACT: Pancreatic ductal adenocarcinoma (PDAC) is associated with accumulation of particular oncogenic mutations and recent genetic sequencing studies have identified ataxia telangiectasia-mutated (ATM) mutations in PDAC cohorts. Here we report that conditional deletion of ATM in a mouse model of PDAC induces a greater number of proliferative precursor lesions coupled with a pronounced fibrotic reaction. ATM-targeted mice display altered TGFβ-superfamily signalling and enhanced epithelial-to-mesenchymal transition (EMT) coupled with shortened survival. Notably, our mouse model recapitulates many features of more aggressive human PDAC subtypes. Particularly, we report that low expression of ATM predicts EMT, a gene signature specific for Bmp4 signalling and poor prognosis in human PDAC. Our data suggest an intimate link between ATM expression and pancreatic cancer progression in mice and men. KC (Atm+/+) and AKC (Atm-/-) mouse pancreata at 5 weeks old (n= 3 KC; n= 3 AKC) or 10 weeks old (n=3 KC; n=4 AKC) were subjected to microarray analysis.

ORGANISM(S): Mus musculus

SUBMITTER: Martin Zenke

PROVIDER: E-GEOD-68808 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Loss of ATM accelerates pancreatic cancer formation and epithelial–mesenchymal transition

Project description:Pancreatic ductal adenocarcinoma (PDAC) is associated with accumulation of particular oncogenic mutations and recent genetic sequencing studies have identified ataxia telangiectasia-mutated (ATM) mutations in PDAC cohorts. Here we report that conditional deletion of ATM in a mouse model of PDAC induces a greater number of proliferative precursor lesions coupled with a pronounced fibrotic reaction. ATM-targeted mice display altered TGFβ-superfamily signalling and enhanced epithelial-to-mesenchymal transition (EMT) coupled with shortened survival. Notably, our mouse model recapitulates many features of more aggressive human PDAC subtypes. Particularly, we report that low expression of ATM predicts EMT, a gene signature specific for Bmp4 signalling and poor prognosis in human PDAC. Our data suggest an intimate link between ATM expression and pancreatic cancer progression in mice and men.

2015-08-07 | GSE68808 | GEO

Antithetical NFATc1-Sox2 and p53-miR-200 signalling networks governs pancreatic cancer cell plasticity and tumour progression

Project description:Pancreatic ductal adenocarcinoma (PDAC) cells undergo epithelial mesenchymal transdifferentiation (EMT) in adaption to environmental cues, including inflammation, a process that combines tumour cell dedifferentiation with dissemination and acquisition of stemness features. However, the mechanisms coupling inflammation-induced signalling pathways with EMT and stemness remain largely unknown. Here, we reveal the inflammation-induced transcription factor NFATc1 as a central regulator of pancreatic cancer cell plasticity.

2015-02-10 | E-MTAB-2324 | biostudies-arrayexpress

EMT alterations in the solute carrier landscape uncover SLC22A10/A15 imposed vulnerabilities in pancreatic cancer

Project description:<p>The involvement of membrane-bound solute carriers (SLCs) in neoplastic transdifferentiation processes is poorly defined. Here, we examined changes in the SLC landscape during epithelial-mesenchymal transition (EMT) of pancreatic cancer cells. We show that two SLCs from the organic anion/cation transporter family, SLC22A10 and SLC22A15, favor EMT via interferon (IFN) α and γ signaling activation of receptor tyrosine kinase-like orphan receptor 1 (ROR1) expression. In addition, SLC22A10 and SLC22A15 allow tumor cell accumulation of glutathione to support EMT via the IFNα/γ-ROR1 axis. Moreover, a pan-SLC22A inhibitor lesinurad reduces EMT-induced metastasis and gemcitabine chemoresistance to prolong survival in mouse models of pancreatic cancer, thus identifying new vulnerabilities for human PDAC.</p>

2021-10-15 | MTBLS1925 | MetaboLights

Disturbed Balance of Protein Phosphatase Type 2A (PP2A) is Driving Epithelial-to-Mesenchymal Transition in Human Pan-creatic Cancer Patients

Project description:The incidence for pancreatic ductal adenocarcinoma (PDAC) is rising which has a low survival rate. In cancer, Epithelial-to-Mesenchymal transition (EMT) contribute to an aggressive phenotype. Protein Phosphatase Type 2A (PP2A) are initially regarded as tumor suppressors, the connection with EMT in patients is uncertain. We investigated the relation of a ‘PP2A’ gene signature (en-compassing catalytic, structural and regulatory subunits; and endogenous PP2A inhibitors and activators) with EMT in PDAC patients. We could demonstrate a link between PDAC and EMT in four patient datasets using datamining, correlation study and gene set analysis. Furthermore, we identified a strong association of PP2A with EMT in advanced pancreatic cancer patients and in particular a significant upregulation of PP2A inhibitor genes in aggressive/EMT-high PDAC. In vitro, pharmacological inhibition of PP2A through Okadaic acid induced EMT in human pancreatic cells. Two different cell models were developed and their morphology, gene and protein expression determined. In the more advanced OA-induced EMT model (OA7G), statistical changes in proteins of natural PP2A-inhibitors was observed and this requires further investigations. Translationally, these observations indicate that PP2A could be a central factor in cancer and it is therefore attractive to test compounds that can target PP2A enzyme activity in PDAC.

2023-07-20 | PXD037976 | Pride

Spontaneously Evolved Progenitor Niches Escape Yap Oncogene Addiction in Advanced Pancreatic Ductal Adenocarcinomas [Cut&Tag]

Project description:Lineage plasticity has been proposed as a major source of intratumoral heterogeneity and therapeutic resistance. Employing an inducible genetic engineered mouse model, we illustrate that lineage plasticity enables advanced Pancreatic Ductal Adenocarcinoma (PDAC) tumors to develop spontaneous relapse following elimination of the central oncogenic driver - Yap. Transcriptomic and immunohistochemistry analysis of a large panel of PDAC tumors reveals that within high-grade tumors, small niches of PDAC cells gradually evolve to re-activate pluripotent transcription factors (PTFs), which lessen their dependency on Yap. Comprehensive Cut&Tag analysis demonstrate that although acquisition of PTF expression is coupled with the process of epithelial-to-mesenchymal transition (EMT), PTFs form a core transcriptional regulatory circuitry (CRC) with Jun to overcome Yap dependency, which is distinct from the classic TGFb-induced EMT-TF network. A chemical-genetic screen and follow-up functional studies establish Brd4 as an epigenetic gatekeeper for the PTF-Jun CRC, and strong synergy between BET and Yap inhibitors in blocking PDAC growth.

2023-01-11 | GSE210412 | GEO

Spontaneously Evolved Progenitor Niches Escape Yap Oncogene Addiction in Advanced Pancreatic Ductal Adenocarcinomas [RNA-Seq]

2023-03-02 | GSE224566 | GEO

Expression data from stabilized epithelial pancreatic cancer cells

Project description:Pancreatic ductal adenocarcinoma is therapeutically recalcitrant and metastatic. Epithelial to mesenchymal transition (EMT) is associated with metastasis, however, a causal connection needs further unraveling. We explored the impact of stabilized EMT states on PDAC metastasis through the use of genetically-engineered mouse models that exhibit a stabilized epithelial phenotype through the deletion of EMT-driving transcription factors Snail and Twist together We examined the cancer cell-intrinsic pathways associated with stabilized epithelial pancreatic adenocarcinoma cells.

2021-04-13 | GSE164612 | GEO

Nuclear protein (Nupr)-1 is required for pancreatic adenocarcinoma development in Pdx1-cre;LSL-KrasG12D;Ink4a/Arffl/fl mice

Project description:Nuclear Protein 1 (Nupr1) is a major actor of the cell stress response required for KrasG12D-driven formation of pancreatic intraepithelial neoplastic (PanINs) lesions in mice. We investigated the impact of Nupr1-depletion on the development and biology of murin pancreatic adenocarcinomas (PDAC) in the Pdx1-cre;LSL-KrasG12D;Ink4a/Arffl/fl (KIC) mice. We found that only one half of Nupr1-deficient mice developed PDAC. This is related to increased caspase 3 activity and low IER3 expression in Nupr1-deficient;KIC in the pancreas. Moreover, when Nupr1-deficient;KIC mice do develop PDAC, tumors present with impaired epithelial-to-mesenchymal transition (EMT). Transcriptoma analysis revealed that Nupr1-deficient and Nupr1wt;KIC PDACs presented enrichment of gene signatures of the human classical- and quasi-mesenchymal (QM)-PDAC respectively. Moreover, Nupr1-deficient;KIC PDACs shared with human classical-PDACs overexpression of Kras-activation genes. In addition, cells derived from Nupr1-deficient;KIC PDACs formed fewer microspheres in vitro compared to Nupr1wt;KIC cells, indicative of stemness impairment in the absence of Nupr1. Finally, we found that Nupr1-deficient;KIC cells were more sensitive to some anticancer drugs than their Nupr1wt counterpart. Hence, this study establishes the pivotal role of Nupr1 in PDAC progression after PanIN and in PDAC EMT in vivo, with an impact in PDAC cell stemness. As a consequence, according to absence or presence of Nupr1, KIC mice develop tumors that phenocopy human classical- or QM-PDAC, respectively, thus becoming attractive models for preclinical drug trials. We investigated the impact of the homozygous deletion of the Nupr1 gene on pancreatic adenocarcinoma development and biology in the Pdx1-cre;LSL-KrasG12D;Ink4a/Arffl/fl (KIC) mouse model.

2012-12-16 | E-GEOD-42322 | biostudies-arrayexpress

Generation of fibronectin fragments by pancreatic trypsin: a physiological mechanism hampering PDAC progression.

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2023-10-24 | PXD035770 | Pride

Genome-wide map of GATA6 DNA binding in human PDAC cells

Project description:By studying a mouse model, as well as human tumors samples and cell lines, we have revealed a tumor suppressive role for Gata6 in the pathogenesis of pancreatic ductal adenocarcinoma (PDAC). In order to understand the mechanism underlying such tumor suppressive function, we analyzed the genome-wide DNA-binding of GATA6 in a human PDAC cell line (PaTu8988S). GATA6 is found to bind the promoter of genes involved in the epithelial differentiation programme, as well as of genes involved in the mesenchymal programme. With this we describe a novel GATA6-dependent mechanism of regulation of EMT. Examination of GATA6 binding to the DNA in a human PDAC cell line

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