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Selective Requirement of PI3K/PDK1 Signaling for Kras Oncogene-Driven Pancreatic Cell Plasticity and Cancer

by: Stefan Eser, Nina Reiff, Marlena Messer, Barbara Seidler, Kathleen Gottschalk, Melanie Dobler, Maren Hieber, Andreas Arbeiter, Sabine Klein, Bo Kong, Christoph W. Michalski, Anna M. Schlitter, Irene Esposito, Alexander J. Kind, Lena Rad, Angelika E. Schnieke, Manuela Baccarini, Dario R. Alessi, Roland Rad, Roland M. Schmid, Günter Schneider, Dieter Saur
Cancer Cell (February 2013), doi:10.1016/j.ccr.2013.01.023  Key: citeulike:12116453

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Abstract

Oncogenic Kras activates a plethora of signaling pathways, but our understanding of critical Ras effectors is still very limited. We show that cell-autonomous phosphoinositide 3-kinase (PI3K) and 3-phosphoinositide-dependent protein kinase 1 (PDK1), but not Craf, are key effectors of oncogenic Kras in the pancreas, mediating cell plasticity, acinar-to-ductal metaplasia (ADM), and pancreatic ductal adenocarcinoma (PDAC) formation. This contrasts with Kras-driven non-small cell lung cancer, where signaling via Craf, but not PDK1, is an essential tumor-initiating event. These in vivo genetic studies together with pharmacologic treatment studies in models of human ADM and PDAC demonstrate tissue-specific differences of oncogenic Kras signaling and define PI3K/PDK1 as a suitable target for therapeutic intervention specifically in PDAC. ⺠PI3K (p110αH1047R)-induced neoplasia phenocopies KrasG12D-driven ADM, PanINs, and PDAC ⺠Deletion of Pdk1 blocks KrasG12D-induced PDAC but not NSCLC ⺠Craf is dispensable for Kras-induced PanIN and PDAC development ⺠The PI3K/PDK1 pathway is a target for therapeutic intervention in Kras-driven PDAC


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