西亚试剂：DYRK1B-dependent autocrine-to-paracrine shift of Hedgehog s

DYRK1B-dependent autocrine-to-paracrine shift of Hedgehog signaling by mutant RAS
Matthias Lauth1,4, ?sa Bergstr?m1, Takashi Shimokawa1, Ulrica Tostar1, Qianren Jin1, Volker Fendrich2, Carmen Guerra3, Mariano Barbacid3 & Rune Toftg?rd1

Synergism between the RAS and Hedgehog (HH) pathways has been suggested for carcinogenesis in the pancreas, lung and colon. We investigated the molecular cross-talk between RAS and HH signaling and found that, although mutant RAS induces or enhances SHH expression and favors paracrine HH signaling, it antagonizes autocrine HH signal transduction. Activated RAS can be found in primary cilia, the central organelle of HH signal transduction, but functions in a cilium-independent manner and interferes with Gli2 function and Gli3 processing. In addition, the cell-autonomous negative regulation of HH signal transduction involves the RAS effector molecule dual specificity tyrosine phosphorylated and regulated kinase 1B (DYRK1B). In line with a redirection of autocrine toward paracrine HH signaling by a KRAS-DYRK1B network, we find high levels of GLI1 expression restricted to the stromal compartment and not to SHH-expressing tumor cells in human pancreatic adenocarcinoma.

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