Jens T. Siveke

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Initiation of pancreatic ductal adenocarcinoma (PDA) is definitively linked to activating mutations in the KRAS oncogene. However, PDA mouse models show that mutant Kras expression early in development gives rise to a normal pancreas, with tumors forming only after a long latency or pancreatitis induction. Here, we show that oncogenic KRAS upregulates(More)
Recent studies have shown that Wnt/beta-catenin signaling is essential for development of the exocrine pancreas, but the role of beta-catenin-dependent target genes such as Myc during pancreatic development is not well known. Here, we show that tissue-specific deletion of Myc causes a slightly accelerated differentiation of pancreatic epithelial cells into(More)
Growth factors have been implicated in pancreatic carcinogenesis. In this study we analyzed the effect of Tgfa overexpression in addition to mutant Kras(G12D) by crossing Elastase-Tgfa mice with p48(+/Cre);Kras(+/LSL-G12D) mice. We show that concomitant expression of TGFalpha and Kras(G12D) accelerates the progression of mPanIN lesions to metastatic(More)
UNLABELLED Notch signaling through the Notch2 receptor is essential for normal biliary tubulogenesis during liver development. However, the signaling events downstream of Notch2 critical for this process are less well defined. Furthermore, whether Notch signaling also underlies adult hepatic cell fate decisions is largely unknown. By implementing different(More)
T effector subsets, such as Th1 or Th2 cells, are key players in inflammatory reactions. It is not known whether chemokines are able to recruit these subsets differentially, as has been shown for memory vs naive T cells. Here we demonstrate that Th1 and Th2 cells differ in their intrinsic migratory properties and their chemotactic responsiveness toward(More)
Pancreatic cancer is one of the most fatal malignancies lacking effective therapies. Notch signaling is a key regulator of cell fate specification and pancreatic cancer development; however, the role of individual Notch receptors and downstream signaling is largely unknown. Here, we show that Notch2 is predominantly expressed in ductal cells and pancreatic(More)
OBJECTIVE Volume depletion and/or increased hematocrit are associated with poor prognosis in necrotizing pancreatitis. Several studies suggest that intrathoracic blood volume index (ITBI) might be superior to central venous pressure (CVP) with regard to preload assessment. Therefore, the aim of our study was to evaluate the predictive value of CVP and(More)
PURPOSE Validity of the seventh edition of the American Joint Committee on Cancer/International Union Against Cancer (AJCC/UICC) staging systems for gastric cancer has been evaluated in several studies, mostly in Asian patient populations. Only few data are available on the prognostic implications of the new classification system on a Western population.(More)
BACKGROUND & AIMS The mechanisms for tissue regeneration and renewal after acute pancreatitis are not well understood but may involve activation of Notch signaling. To study the effect of Notch signaling ablation during acute experimental pancreatitis, we used a chemical and genetic approach to ablate Notch signaling in cerulein-induced pancreatitis in(More)