Abstract:
:Human WWOX gene encodes a proapoptotic WW domain-containing oxidoreductase WOX1 (also named WWOX, FOR2 or WWOXv1). Apoptotic and stress stimuli activate WOX1 via Tyr33 phosphorylation and nuclear translocation. WOX1 possesses a tetrad NSYK motif in the C-terminal short-chain alcohol dehydrogenase/reductase (SDR) domain, which may bind estrogen and androgen. Here, we determined that 17beta-estradiol (E(2)) activated WOX1, p53 and ERK in COS7 fibroblasts, primary lung epithelial cells, and androgen receptor (AR)-negative prostate DU145 cells, but not in estrogen receptor (ER)-positive breast MCF7 cells. Androgen also activated WOX1 in the AR-negative DU145 cells. These observations suggest that sex hormone-mediated Tyr33 phosphorylation and nuclear translocation of WOX1 is independent of ER and AR. Stress stimuli increase physical binding of p53 with WOX1 in vivo. We determined here that E(2) increased the formation of p53/WOX1 complex and their nuclear translocation in COS7 cells; however, nuclear translocation of this complex could not occur in MCF7 cells. By immunohistochemistry, we determined that progression of prostate from normal to hyperplasia, cancerous and metastatic stages positively correlate with upregulation and activation of WOX1 and WOX2 (FOR1/WWOXv2). In contrast, breast cancer development to a premetastatic state is associated with upregulation and Tyr33 phosphorylation of cytosolic WOX1 and WOX2, followed by significant downregulation or absent expression during metastasis. These Tyr33-phosphorylated proteins are mostly located in the mitochondria without translocating to the nuclei, which is comparable to those findings in cultured breast cancer cells. Together, sex steroid hormone-induced activation of WOX1 and WOX2 is independent of ER and AR, and this activation positively correlates with cancerous progression of prostate and breast to a premetastatic state.
journal_name
Oncogenejournal_title
Oncogeneauthors
Chang NS,Schultz L,Hsu LJ,Lewis J,Su M,Sze CIdoi
10.1038/sj.onc.1208124subject
Has Abstractpub_date
2005-01-20 00:00:00pages
714-23issue
4eissn
0950-9232issn
1476-5594pii
1208124journal_volume
24pub_type
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