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- W4213060897 abstract "Notch signaling, which is essential for tissue development and homeostasis, has received attention as an attractive target for cancer therapy, tissue engineering and regenerative medicine. For signal activation, the Notch receptor undergoes proteolysis after binding to its ligand. This process is mediated by a mechanical pulling force, and receptor trans-endocytosis is known to play a central role in supplying the force. On the other hand, Notch ligands immobilized on carrier materials also induce artificial Notch activation. However, the mechanism of signal activation by immobilized ligand proteins is not fully understood. Here, we found that the actin cytoskeleton in Notch1-expressing cells contributes to signal activation induced by immobilized DLL4 (Delta-like ligand 4), and the results showed that pharmacological inhibition of actin dynamics impaired Notch signaling induced by DLL4-coated beads. Moreover, inhibition of actin dynamics remarkably impaired cell migration and was correlated with Notch signaling activity. We also investigated the contribution of Notch cis-endocytosis (the endocytosis of Notch receptor into signal-receiving cells) as an actin-mediated cell biological process to further explore the mechanism of Notch activation by DLL4-coated beads. Compromising the receptor cis-endocytosis pathway with the dynamin inhibitor did not alter DLL4-coated bead-induced Notch signaling, indicating that signal activation is not mediated by dynamin-dependent receptor cis-endocytosis. These findings suggest that Notch activation by immobilized ligands is primarily driven by actin-based cell movement, which might supply a sufficient mechanical force for receptor cleavage, but not by receptor cis-endocytosis." @default.
- W4213060897 created "2022-02-24" @default.
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- W4213060897 date "2022-04-01" @default.
- W4213060897 modified "2023-09-27" @default.
- W4213060897 title "Immobilized DLL4-induced Notch signaling is mediated by dynamics of the actin cytoskeleton" @default.
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- W4213060897 doi "https://doi.org/10.1016/j.bbrc.2022.02.084" @default.
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