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- W4225973344 abstract "Here we review the regulation of macropinocytosis by Wnt growth factor signaling. Canonical Wnt signaling is normally thought of as a regulator of nuclear β-catenin, but emerging results indicate that there is much more than β-catenin to the Wnt pathway. Macropinocytosis is transiently regulated by EGF-RTK-Ras-PI3K signaling. Recent studies show that Wnt signaling provides for sustained acquisition of nutrients by macropinocytosis. Endocytosis of Wnt-Lrp6-Fz receptor complexes triggers the sequestration of GSK3 and components of the cytosolic destruction complex such as Axin1 inside multivesicular bodies (MVBs) through the action of the ESCRT machinery. Wnt macropinocytosis can be induced both by the transcriptional loop of stabilized β-catenin, and by the inhibition of GSK3 even in the absence of new protein synthesis. The cell is poised for macropinocytosis, and all it requires for triggering of Pak1 and the actin machinery is the inhibition of GSK3. Striking lysosomal acidification, which requires macropinocytosis, is induced by GSK3 chemical inhibitors or Wnt protein. Wnt-induced macropinocytosis requires the ESCRT machinery that forms MVBs. In cancer cells, mutations in the tumor suppressors APC and Axin1 result in extensive macropinocytosis, which can be reversed by restoring wild-type protein. In basal cellular conditions, GSK3 functions to constitutively repress macropinocytosis." @default.
- W4225973344 created "2022-05-05" @default.
- W4225973344 creator A5001643742 @default.
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- W4225973344 date "2022-01-01" @default.
- W4225973344 modified "2023-09-26" @default.
- W4225973344 title "Wnt, GSK3, and Macropinocytosis" @default.
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- W4225973344 doi "https://doi.org/10.1007/978-3-030-94004-1_9" @default.
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