Presenilin Deficiency or Lysosomal Inhibition Enhances Wnt Signaling through Relocalization of GSK3 to the Late-Endosomal Compartment

Radek Dobrowolski, Philipp Vick, Diego Ploper, Iwona Gumper, Harriet Snitkin, David D. Sabatini, Edward M. De Robertis

Research output: Contribution to journalArticle

50 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1316-1328
Number of pages13
JournalCell Reports
Volume2
Issue number5
DOIs
StatePublished - Nov 29 2012

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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    Dobrowolski, R., Vick, P., Ploper, D., Gumper, I., Snitkin, H., Sabatini, D. D., & De Robertis, E. M. (2012). Presenilin Deficiency or Lysosomal Inhibition Enhances Wnt Signaling through Relocalization of GSK3 to the Late-Endosomal Compartment. Cell Reports, 2(5), 1316-1328. https://doi.org/10.1016/j.celrep.2012.09.026