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• W2029761667 abstract "Abstract Tyrosine kinase receptors such as members of the epidermal growth factor receptor family and their respective ligands are frequently overexpressed in pancreatic cancer as well as in chronic pancreatitis. In this study, the role of ErbB2 in the exocrine pancreas was examined by ectopic overexpression under the control of the proximal rat elastase promoter. Three independent transgenic mouse lines overexpressing ErbB2 were established by pronuclear injection. Pancreatic mRNA and protein levels were analyzed by real time PCR, immunohistochemistry and immunoblot analysis, RAS activity by using a specific immunoprecipitation assay and various kinase activities by phosphospecific antibodies. Overexpression of ErbB2 in the exocrine pancreas resulted in increased RAS activity and downstream activation of ERK1/2, but not in transgenic increased proliferation of acinar and ductal cells. At later timepoints, some mice showed focal areas of acinar cell damage with upregulated mRNA levels for Cyclin D1 and p16 INK4a . Despite the increased mRNA level, cyclin D1 protein levels were downregulated. We observed areas of focal infiltrations with inflammatory cells interspersed in the exocrine pancreas. NF‐κB activity was induced in transgenic acinar cells compared with controls contributing to high levels of chemokine and cytokine gene expression such as CCR‐1 and CCL3 . These data suggest that overexpression of ErbB2 in acinar cells leads to increased RAS activity without cell cycle progression and mediates inflammation via NF‐κB. We conclude that the biological response of ErbB2/RAS signaling depends highly on cellular context. © 2007 Wiley‐Liss, Inc." @default.
• W2029761667 created "2016-06-24" @default.
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• W2029761667 date "2007-06-01" @default.
• W2029761667 modified "2023-10-14" @default.
• W2029761667 title "Overexpression ofErbB2 in the exocrine pancreas induces an inflammatory response but not increased proliferation" @default.
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• W2029761667 doi "https://doi.org/10.1002/ijc.22779" @default.
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