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Liganded Androgen Receptor Interaction with
-Catenin
NUCLEAR CO-LOCALIZATION AND MODULATION OF TRANSCRIPTIONAL
ACTIVITY IN NEURONAL CELLS*
John E.
Pawlowski,
Jessica R.
Ertel,
Melissa P.
Allen,
Mei
Xu,
Cheryl
Butler,
Elizabeth M.
Wilson§, and
Margaret E.
Wierman¶
From the Research Service, Veterans Affairs Medical
Center and Department of Medicine, University of Colorado Health
Sciences Center, Denver, Colorado 80220 and § Laboratory
of Reproductive Biology, University of North Carolina,
Chapel Hill, North Carolina 27599
A yeast two-hybrid assay was employed to identify
androgen receptor (AR) protein partners in gonadotropin-releasing
hormoneneuronal cells. By using an AR deletion construct
(AR-(371-485))as a bait, -catenin was identified as an
AR-interacting proteinfrom a gonadotropin-releasing hormone neuronal
cell library. Immunolocalizationof co-transfected AR and
FLAG--catenin demonstrated that FLAG--cateninwas predominantly
cytoplasmic in the absence of androgen. In thepresence of
5-dihydrotestosterone, FLAG--catenin completelyco-localized to
the nucleus with AR. This effect was specificto AR because liganded
progesterone, glucocorticoid, or estrogen receptors did not
translocate FLAG--catenin to the nucleus.Agonist-bound AR was
required because the AR antagonists casodexand hydroxyflutamide failed
to translocate -catenin. Time courseexperiments demonstrated that
co-translocation occurred with similarkinetics. Nuclear
co-localization was independent of the glycogensynthase kinase-3,
p42/44 ERK mitogen-activated protein kinase,and phosphatidylinositol
3-kinase pathways because inhibitorsof these pathways had no effect.
Transcription assays demonstratedthat liganded AR repressed
-catenin/T cell factor-responsivereporter gene activity.
Conversely, co-expression of -catenin/Tcell factor repressed AR
stimulation of AR-responsive reportergene activity. Our data suggest
that liganded AR shuttles -cateninto the nucleus and that nuclear
interaction of AR with -cateninmay modulate transcriptional
activity in androgen targettissues.
Androgen activates {beta}-catenin signaling in bladder cancer cells.
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Carcinogenesis
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Androgen-mediated improvement of body composition and muscle function involves a novel early transcriptional program including IGF1, mechano growth factor, and induction of {beta}-catenin.
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Lycopene inhibits IGF-I signal transduction and growth in normal prostate epithelial cells by decreasing DHT-modulated IGF-I production in co-cultured reactive stromal cells.
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Carcinogenesis
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Wnt/beta-Catenin Signaling Is a Component of Osteoblastic Bone Cell Early Responses to Load-bearing and Requires Estrogen Receptor {alpha}.
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Cancer Res.
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Mol. Cell. Proteomics
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The Wnt Co-receptor LRP5 Is Essential for Skeletal Mechanotransduction but Not for the Anabolic Bone Response to Parathyroid Hormone Treatment.
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The Glucocorticoid Receptor Represses Cyclin D1 by Targeting the Tcf-beta-Catenin Complex.
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Mol. Cell. Biol.
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Testosterone Inhibits Adipogenic Differentiation in 3T3-L1 Cells: Nuclear Translocation of Androgen Receptor Complex with {beta}-Catenin and T-Cell Factor 4 May Bypass Canonical Wnt Signaling to Down-Regulate Adipogenic Transcription Factors.
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Endocrinology
147, 141-154
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Interaction of Nuclear Receptors with the Wnt/{beta}-Catenin/Tcf Signaling Axis: Wnt You Like to Know?.
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PNAS
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{beta}-Catenin Is Involved in Insulin-Like Growth Factor 1-Mediated Transactivation of the Androgen Receptor.
The Wnt/{beta}-catenin signaling pathway targets PPAR{gamma} activity in colon cancer cells.
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PNAS
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Mol. Endocrinol.
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Wnt/{beta}-Catenin and Estrogen Signaling Converge in Vivo.
A. P. Kouzmenko, K.-i. Takeyama, S. Ito, T. Furutani, S. Sawatsubashi, A. Maki, E. Suzuki, Y. Kawasaki, T. Akiyama, T. Tabata, et al. (2004)
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Matrix Metalloproteinase Activity Modulates Tumor Size, Cell Motility, and Cell Invasiveness in Murine Aggressive Fibromatosis.
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Cancer Res.
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Endocrinology
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Identification of Aryl Hydrocarbon Receptor as a Putative Wnt/{beta}-Catenin Pathway Target Gene in Prostate Cancer Cells.
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PNAS
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Convergence of Wnt Signaling and Steroidogenic Factor-1 (SF-1) on Transcription of the Rat Inhibin {alpha} Gene.
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Identification of the LIM Protein FHL2 as a Coactivator of beta -Catenin.
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|Abstract »|Full Text »|PDF »