YAP-dependent induction of amphiregulin identifies a non-cell-autonomous component of the Hippo pathway.

Nature Cell Biology
Jianmin ZhangDaniel A Haber

Abstract

The Hippo signalling pathway regulates cellular proliferation and survival, thus has profound effects on normal cell fate and tumorigenesis. The pivotal effector of this pathway is YAP (yes-associated protein), a transcriptional co-activator amplified in mouse and human cancers, where it promotes epithelial to mesenchymal transition (EMT) and malignant transformation. So far, studies of YAP target genes have focused on cell-autonomous mediators; here we show that YAP-expressing MCF10A breast epithelial cells enhance the proliferation of neighbouring untransfected cells, implicating a non-cell-autonomous mechanism. We identify the gene for the epidermal growth factor receptor (EGFR) ligand amphiregulin (AREG) as a transcriptional target of YAP, whose induction contributes to YAP-mediated cell proliferation and migration, but not EMT. Knockdown of AREG or addition of an EGFR kinase inhibitor abrogates the proliferative effects of YAP expression. Suppression of the negative YAP regulators LATS1 and 2 (large tumour suppressor 1 and 2) is sufficient to induce AREG expression, consistent with physiological regulation of AREG by the Hippo pathway. Genetic interaction between the Drosophila YAP orthologue Yorkie and Egfr signalling com...Continue Reading

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