The cell adhesion molecule echinoid functions as a tumor suppressor and upstream regulator of the Hippo signaling pathway.

Abstract:

:The Hippo (Hpo) signaling pathway controls tissue growth and organ size in species ranging from Drosophila to mammals and is deregulated in a wide range of human cancers. The core pathway consists of the Hpo/Warts (Wts) kinase cassette that phosphorylates and inactivates the transcriptional coactivator Yorkie (Yki). Here, we report that Echinoid (Ed), an immunoglobulin domain-containing cell adhesion molecule, acts as an upstream regulator of the Hpo pathway. Loss of Ed compromises Yki phosphorylation, resulting in elevated Yki activity that increases Hpo target gene expression and drives tissue overgrowth. Ed physically interacts with and stabilizes the Hpo-binding partner Salvador (Sav) at adherens junctions. Ed/Sav interaction is promoted by cell-cell contact and requires dimerization of Ed cytoplasmic domain. Overexpression of Sav or dimerized Ed cytoplasmic domain suppressed loss-of-Ed phenotypes. We propose that Ed may link cell-cell contact to Hpo signaling through binding and stabilizing Sav, thus modulating the Hpo kinase activity.

journal_name

Dev Cell

journal_title

Developmental cell

authors

Yue T,Tian A,Jiang J

doi

10.1016/j.devcel.2011.12.011

subject

Has Abstract

pub_date

2012-02-14 00:00:00

pages

255-67

issue

2

eissn

1534-5807

issn

1878-1551

pii

S1534-5807(11)00577-6

journal_volume

22

pub_type

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