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Complex regulation of human androgen receptor expression by Wnt signaling in prostate cancer cells.

Abstract：

:beta-Catenin, a component of the Wnt signaling pathway, is a coactivator of human androgen receptor (hAR) transcriptional activity. Here, we show that Wnt signaling also influences androgen-mediated signaling through its ability to regulate hAR mRNA and protein in prostate cancer (PCa) cells. Three functional LEF-1/TCF binding sites lie within the promoter of the hAR gene as shown by CHIP assays that captured beta-catenin-bound chromatin from Wnt-activated LNCaP cells. Chimeric reporter vectors that use the hAR gene promoter to drive luciferase expression confirmed that these LEF-1/TCF binding elements are able to confer robust upregulation of luciferase expression when stimulated by Wnt-1 or by transfection with beta-catenin and that dominant-negative TCF or mutations within the dominant TCF-binding element abrogated the response. Semi-quantitative and real time RT-PCR assays confirmed that Wnt activation upregulates hAR mRNA in PCa cells. In contrast, hAR protein expression was strongly suppressed by Wnt activation. The reduction of hAR protein is consistent with evidence that Wnt signaling increased phosphorylation of Akt and its downstream target, MDM2 that promotes degradation of hAR protein through a proteasomal pathway. These data indicate that the hAR gene is a direct target of LEF-1/TCF transcriptional regulation in PCa cells but also show that the expression of the hAR protein is suppressed by a degradation pathway regulated by cross-talk of Wnt to Akt that is likely mediated by Wnt-directed degradation of the B regulatory subunit of protein phosphatase, PP2A.

journal_name

Oncogene

journal_title

Oncogene

authors

Yang X,Chen MW,Terry S,Vacherot F,Bemis DL,Capodice J,Kitajewski J,de la Taille A,Benson MC,Guo Y,Buttyan R

doi

10.1038/sj.onc.1209366

subject

Has Abstract

pub_date

2006-06-08 00:00:00

pages

3436-44

issue

24

eissn

0950-9232

issn

1476-5594

pii

1209366

journal_volume

25

pub_type

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