WW domain-containing proteins, WWOX and YAP, compete for interaction with ErbB-4 and modulate its transcriptional function

Rami I. Aqeilan*, Valentina Donati, Alexey Palamarchuk, Francesco Trapasso, Mohamed Kaou, Yuri Pekarsky, Marius Sudol, Carlo M. Croce

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

177 Scopus citations


The WW domain-containing oxidoreductase, WWOX, is a tumor suppressor that is deleted or altered in several cancer types. We recently showed that WWOX interacts with p73 and AP-2γ and suppresses their transcriptional activity. Yes-associated protein (YAP), also containing WW domains, was shown to associate with p73 and enhance its transcriptional activity. In addition, YAP interacts with ErbB-4 receptor tyrosine kinase and acts as transcriptional coactivator of the COOH-terminal fragment (CTF) of ErbB-4. Stimulation of ErbB-4-expressing cells with 12-O-tetradecanoylphorbol-13-acetate (TPA) results in the proteolytic cleavage of its cytoplasmic domain and translocation of this domain to the nucleus. Here we report that WWOX physically associates with the full-length ErbB-4 via its first WW domain. Coexpression of WWOX and ErbB-4 in HeLa cells followed by treatment with TPA results in the retention of ErbB-4 in the cytoplasm. Moreover, in MCF-7 breast carcinoma cells, expressing high levels of endogenous WWOX, endogenous ErbB-4 is also retained in the cytoplasm. In addition, our results show that interaction of WWOX and ErbB-4 suppresses transcriptional coactivation of CTF by YAP in a dose-dependent manner. A mutant form of WWOX lacking interaction with ErbB-4 has no effect on this coactivation of ErbB-4. Furthermore, WWOX is able to inhibit coactivation of p73 by YAP. In summary, our data indicate that WWOX antagonizes the function of YAP by competing for interaction with ErbB-4 and other targets and thus affect its transcriptional activity.

Original languageAmerican English
Pages (from-to)6764-6772
Number of pages9
JournalCancer Research
Issue number15
StatePublished - 1 Aug 2005
Externally publishedYes


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