Abstract：
:Sustained canonical Wnt signaling requires the inhibition of glycogen synthase kinase 3 (GSK3) activity by sequestration of GSK3 inside multivesicular endosomes (MVEs). Here, we show that Wnt signaling is increased by the lysosomal inhibitor chloroquine, which causes accumulation of MVEs. A similar MVE expansion and increased Wnt responsiveness was found in cells deficient in presenilin, a protein associated with Alzheimer's disease. The Wnt-enhancing effects were entirely dependent on the functional endosomal sorting complex required for transport (ESCRT), which is needed for the formation of intraluminal vesicles in MVEs. We suggest that accumulation of late endosomal structures leads to enhanced canonical Wnt signaling through increased Wnt-receptor/GSK3 sequestration. The decrease in GSK3 cytosolic activity stabilized cytoplasmic GSK3 substrates such as β-catenin, the microtubule-associated protein Tau, and other proteins. These results underscore the importance of the endosomal pathway in canonical Wnt signaling and reveal a mechanism for regulation of Wnt signaling by presenilin deficiency.
journal_name
Cell Repjournal_title
Cell reportsauthors
Dobrowolski R,Vick P,Ploper D,Gumper I,Snitkin H,Sabatini DD,De Robertis EMdoi
10.1016/j.celrep.2012.09.026subject
Has Abstractpub_date
2012-11-29 00:00:00pages
1316-28issue
5issn
2211-1247pii
S2211-1247(12)00330-0journal_volume
2pub_type
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