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- W127503595 abstract "With the dawn of metazoans, the ability of cells to communicate with each other became of paramount importance in maintaining tissue homeostasis. The transforming growth factor β (TGF-β) signaling pathway, which plays important roles during embryogenesis and in the adult organism, signals via a heterodimeric receptor complex consisting of two type II and two type I receptors. After receptor activation through ligand binding, Smads mediate the signal from the receptor complex to the nucleus, where they orchestrate transcription. Depending on the context of activation, TGF-β can mediate a plethora of cellular responses, including proliferation, growth arrest, apoptosis and differentiation. In cancer, TGF-β can act as both as a tumor suppressor and promoter. During early stages of tumorigenesis, TGF-β prevents proliferation. However, TGF-β is also known to promote tumor progression during later stages of the disease, where it can induce differentiation of cancer cells towards a migratory phenotype. The aim of this thesis was to investigate how cells can differentiate their response upon TGF-β pathway activation. The first paper describes the role of Notch signaling in TGF-β induced growth arrest, demonstrating that TGF-β promotes Notch activity and that Notch signaling is required for prolonged TGF-β induced cell cycle arrest. In the second and third paper, we investigate the role of SIK, a member of the AMPK family of kinases, mediating signaling strength of TGF-β through degradation of the TGF-β type I receptor ALK5. While the second paper focuses on the effect of SIK on ALK5 stability and subsequent alterations in TGF-β signaling, the third paper emphasizes cooperation between SIK, Smad7 and the E3 ligase Smurf in degradation of ALK5. Finally, the fourth paper explores a novel role of SIK during TGF-β induced epithelial to mesenchymal transition (EMT). SIK binds to and degrades the polarity protein Par3, leading to enhanced EMT." @default.
- W127503595 created "2016-06-24" @default.
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- W127503595 date "2011-01-01" @default.
- W127503595 modified "2023-10-17" @default.
- W127503595 title "SIK phosphorylates and degrades Par3 to mediate tight junction disassembly during epithelial-mesenchymal transition" @default.
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