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New insights into the mechanism of Wnt signaling pathway activation.

Authors
  • Kikuchi, Akira
  • Yamamoto, Hideki
  • Sato, Akira
  • Matsumoto, Shinji
Type
Published Article
Journal
International review of cell and molecular biology
Publication Date
Jan 01, 2011
Volume
291
Pages
21–71
Identifiers
DOI: 10.1016/B978-0-12-386035-4.00002-1
PMID: 22017973
Source
Medline
License
Unknown

Abstract

Wnts compromise a large family of secreted, hydrophobic glycoproteins that control a variety of developmental and adult processes in all metazoan organisms. Recent advances in the Wnt-signal studies have revealed that distinct Wnts activate multiple intracellular cascades that regulate cellular proliferation, differentiation, migration, and polarity. Although the mechanism by which Wnts regulate different pathways selectively remains to be clarified, evidence has accumulated that in addition to the formation of ligand-receptor pairs, phosphorylation of receptors, receptor-mediated endocytosis, acidification, and the presence of cofactors, such as heparan sulfate proteoglycans, are also involved in the activation of specific Wnt pathways. Here, we review the mechanism of activation in Wnt signaling initiated on the cell-surface membrane. In addition, the mechanisms for fine-tuning by cross talk between Wnt and other signaling are also discussed.

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