Abstract：
:WWOX is a tumor suppressor that functions as a modular protein partner of transcription factors. WWOX contains two WW domains that mediate protein-protein interactions. In this report, we show that WWOX, via its first WW domain, specifically associates with the proline-rich motif of c-Jun proto-oncogene. Our data show that phosphorylation of c-Jun caused by overexpression of mitogen-activated protein kinase kinase kinase 1 (Mekk1), an upstream activator of c-Jun, enhances the interaction of c-Jun with WWOX. Furthermore, exposure of HaCaT keratinocytes to UVC radiation resulted in the association of endogenous WWOX and c-Jun. The WWOX-c-Jun complexes mainly occur in the cytoplasm. Expression of WWOX attenuates the ability of MEKK1 to increase the activity of a c-Jun-driven activating protein-1 (AP-1)-luciferase reporter plasmid. In contrast, a point mutation in the first WW domain of WWOX has no effect on transactivation of AP-1 when coexpressed with c-Jun protein. Our findings reveal a novel functional cross-talk between c-Jun transcription factor and WWOX tumor suppressor protein.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Gaudio E,Palamarchuk A,Palumbo T,Trapasso F,Pekarsky Y,Croce CM,Aqeilan RIdoi
10.1158/0008-5472.CAN-06-3376subject
Has Abstractpub_date
2006-12-15 00:00:00pages
11585-9issue
24eissn
0008-5472issn
1538-7445pii
66/24/11585journal_volume
66pub_type
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