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Regulation of the Transcriptional Coactivator FHL2 Licenses Activation of the Androgen Receptor in Castrate-Resistant Prostate Cancer

Identifieur interne : 005642 ( PascalFrancis/Curation ); précédent : 005641; suivant : 005643

Regulation of the Transcriptional Coactivator FHL2 Licenses Activation of the Androgen Receptor in Castrate-Resistant Prostate Cancer

Auteurs : Meagan J. Mcgrath [Australie] ; Lauren C. Binge Absorn Sriratana [Australie] ; HONG WANG [Australie] ; Paul A. Robinson [Australie] ; David Pook [Australie] ; Clare G. Fedele [Australie] ; Susan Brown [Australie] ; Jennifer M. Dyson [Australie] ; Denny L. Cottle [Australie] ; Belinda S. Cowling [Australie, France] ; Birunthi Niranjan [Australie] ; Gail P. Risbridger [Australie] ; Christina A. Mitchell [Australie]

Source :

RBID : Pascal:13-0291216

Descripteurs français

English descriptors

Abstract

It is now clear that progression from localized prostate cancer to incurable castrate-resistant prostate cancer (CRPC) is driven by continued androgen receptor (AR), signaling independently of androgen. Thus, there remains a strong rationale to suppress AR activity as the single most important therapeutic goal in CRPC treatment. Although the expression of ligand-independent AR splice variants confers resistance to AR-targeted therapy and progression to lethal castrate-resistant cancer, the molecular regulators of AR activity in CRPC remain unclear, in particular those pathways that potentiate the function of mutant AR in CRPC. Here, we identify FHL2 as a novel coactivator of ligand-independent AR variants that are important in CRPC. We show that the nuclear localization of FHL2 and coactivation of the AR is driven by calpain cleavage of the cytoskeletal protein filamin, a pathway that shows differential activation in prostate epithelial versus prostate cancer cell lines. We further identify a novel FHL2-AR-filamin transcription complex, revealing how deregulation of this axis promotes the constitutive, ligand-independent activation of AR variants, which are present in CRPC. Critically, the calpain-cleaved filamin fragment and FHL2 are present in the nucleus only in CRPC and not benign prostate tissue or localized prostate cancer. Thus, our work provides mechanistic insight into the enhanced AR activation, most notably of the recently identified AR variants, including AR-V7 that drives CRPC progression. Furthermore, our results identify the first disease-specific mechanism for deregulation of FHL2 nuclear localization during cancer progression. These results offer general import beyond prostate cancer, given that nuclear FHL2 is characteristic of other human cancers where oncogenic transcription factors that drive disease are activated like the AR in prostate cancer.
pA  
A01 01  1    @0 0008-5472
A02 01      @0 CNREA8
A03   1    @0 Cancer res. : (Chic. Ill.)
A05       @2 73
A06       @2 16
A08 01  1  ENG  @1 Regulation of the Transcriptional Coactivator FHL2 Licenses Activation of the Androgen Receptor in Castrate-Resistant Prostate Cancer
A11 01  1    @1 McGRATH (Meagan J.)
A11 02  1    @1 BINGE ABSORN SRIRATANA (Lauren C.)
A11 03  1    @1 HONG WANG
A11 04  1    @1 ROBINSON (Paul A.)
A11 05  1    @1 POOK (David)
A11 06  1    @1 FEDELE (Clare G.)
A11 07  1    @1 BROWN (Susan)
A11 08  1    @1 DYSON (Jennifer M.)
A11 09  1    @1 COTTLE (Denny L.)
A11 10  1    @1 COWLING (Belinda S.)
A11 11  1    @1 NIRANJAN (Birunthi)
A11 12  1    @1 RISBRIDGER (Gail P.)
A11 13  1    @1 MITCHELL (Christina A.)
A14 01      @1 Department of Biochemistry and Molecular Biol ogy, Monash University, Clayton Victoria @3 AUS @Z 1 aut. @Z 2 aut. @Z 4 aut. @Z 6 aut. @Z 7 aut. @Z 8 aut. @Z 9 aut. @Z 10 aut. @Z 13 aut.
A14 02      @1 Department of Immunology, Monash University, Clayton Victoria @3 AUS @Z 2 aut.
A14 03      @1 Prostate and Breast Cancer Research Group, Department of Anatomy and Developmental Biology, Monash University, Clayton Victoria @3 AUS @Z 3 aut. @Z 5 aut. @Z 11 aut. @Z 12 aut.
A14 04      @1 Department of Oncology, Southern Health @2 East Bentleigh, Victoria @3 AUS @Z 5 aut.
A14 05      @1 Melanoma Research Laboratory, Peter MacCallum Cancer Centre @2 East Melbourne, Victoria @3 AUS @Z 6 aut.
A14 06      @1 Department of Translational Medicine and Neurogenetics, Institut de Genetique et de Biologie Moleculaire et Cellulaire (IGBMC), IIlkirch @2 Strasbourg @3 FRA @Z 10 aut.
A20       @1 5066-5079
A21       @1 2013
A23 01      @0 ENG
A43 01      @1 INIST @2 5088 @5 354000501927990100
A44       @0 0000 @1 © 2013 INIST-CNRS. All rights reserved.
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A47 01  1    @0 13-0291216
A60       @1 P
A61       @0 A
A64 01  1    @0 Cancer research : (Chicago, Ill.)
A66 01      @0 USA
C01 01    ENG  @0 It is now clear that progression from localized prostate cancer to incurable castrate-resistant prostate cancer (CRPC) is driven by continued androgen receptor (AR), signaling independently of androgen. Thus, there remains a strong rationale to suppress AR activity as the single most important therapeutic goal in CRPC treatment. Although the expression of ligand-independent AR splice variants confers resistance to AR-targeted therapy and progression to lethal castrate-resistant cancer, the molecular regulators of AR activity in CRPC remain unclear, in particular those pathways that potentiate the function of mutant AR in CRPC. Here, we identify FHL2 as a novel coactivator of ligand-independent AR variants that are important in CRPC. We show that the nuclear localization of FHL2 and coactivation of the AR is driven by calpain cleavage of the cytoskeletal protein filamin, a pathway that shows differential activation in prostate epithelial versus prostate cancer cell lines. We further identify a novel FHL2-AR-filamin transcription complex, revealing how deregulation of this axis promotes the constitutive, ligand-independent activation of AR variants, which are present in CRPC. Critically, the calpain-cleaved filamin fragment and FHL2 are present in the nucleus only in CRPC and not benign prostate tissue or localized prostate cancer. Thus, our work provides mechanistic insight into the enhanced AR activation, most notably of the recently identified AR variants, including AR-V7 that drives CRPC progression. Furthermore, our results identify the first disease-specific mechanism for deregulation of FHL2 nuclear localization during cancer progression. These results offer general import beyond prostate cancer, given that nuclear FHL2 is characteristic of other human cancers where oncogenic transcription factors that drive disease are activated like the AR in prostate cancer.
C02 01  X    @0 002B14D02
C02 02  X    @0 002B20B02
C03 01  X  FRE  @0 Transcription @5 01
C03 01  X  ENG  @0 Transcription @5 01
C03 01  X  SPA  @0 Transcripción @5 01
C03 02  X  FRE  @0 Récepteur hormonal @5 02
C03 02  X  ENG  @0 Hormonal receptor @5 02
C03 02  X  SPA  @0 Receptor hormonal @5 02
C03 03  X  FRE  @0 Récepteur androgène @5 03
C03 03  X  ENG  @0 Androgen receptor @5 03
C03 03  X  SPA  @0 Receptor andrógeno @5 03
C03 04  X  FRE  @0 Résistance @5 04
C03 04  X  ENG  @0 Resistance @5 04
C03 04  X  SPA  @0 Resistencia @5 04
C03 05  X  FRE  @0 Cancer de la prostate @2 NM @5 05
C03 05  X  ENG  @0 Prostate cancer @2 NM @5 05
C03 05  X  SPA  @0 Cáncer de la próstata @2 NM @5 05
C03 06  X  FRE  @0 Castration @5 06
C03 06  X  ENG  @0 Castration @5 06
C03 06  X  SPA  @0 Castración @5 06
C03 07  X  FRE  @0 Homme @5 07
C03 07  X  ENG  @0 Human @5 07
C03 07  X  SPA  @0 Hombre @5 07
C03 08  X  FRE  @0 Mâle @5 08
C03 08  X  ENG  @0 Male @5 08
C03 08  X  SPA  @0 Macho @5 08
C03 09  X  FRE  @0 Facteur transcription @5 09
C03 09  X  ENG  @0 Transcription factor @5 09
C03 09  X  SPA  @0 Factor transcripción @5 09
C03 10  X  FRE  @0 Protéine FHL2 @4 INC @5 86
C07 01  X  FRE  @0 Pathologie de l'appareil génital mâle @5 37
C07 01  X  ENG  @0 Male genital diseases @5 37
C07 01  X  SPA  @0 Aparato genital macho patología @5 37
C07 02  X  FRE  @0 Pathologie de l'appareil urinaire @5 38
C07 02  X  ENG  @0 Urinary system disease @5 38
C07 02  X  SPA  @0 Aparato urinario patología @5 38
C07 03  X  FRE  @0 Tumeur maligne @2 NM @5 39
C07 03  X  ENG  @0 Malignant tumor @2 NM @5 39
C07 03  X  SPA  @0 Tumor maligno @2 NM @5 39
C07 04  X  FRE  @0 Cancer @2 NM
C07 04  X  ENG  @0 Cancer @2 NM
C07 04  X  SPA  @0 Cáncer @2 NM
C07 05  X  FRE  @0 Pathologie de la prostate @5 40
C07 05  X  ENG  @0 Prostate disease @5 40
C07 05  X  SPA  @0 Prostata patología @5 40
N21       @1 273

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Pascal:13-0291216

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<name sortKey="Niranjan, Birunthi" sort="Niranjan, Birunthi" uniqKey="Niranjan B" first="Birunthi" last="Niranjan">Birunthi Niranjan</name>
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<title level="j" type="main">Cancer research : (Chicago, Ill.)</title>
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<div type="abstract" xml:lang="en">It is now clear that progression from localized prostate cancer to incurable castrate-resistant prostate cancer (CRPC) is driven by continued androgen receptor (AR), signaling independently of androgen. Thus, there remains a strong rationale to suppress AR activity as the single most important therapeutic goal in CRPC treatment. Although the expression of ligand-independent AR splice variants confers resistance to AR-targeted therapy and progression to lethal castrate-resistant cancer, the molecular regulators of AR activity in CRPC remain unclear, in particular those pathways that potentiate the function of mutant AR in CRPC. Here, we identify FHL2 as a novel coactivator of ligand-independent AR variants that are important in CRPC. We show that the nuclear localization of FHL2 and coactivation of the AR is driven by calpain cleavage of the cytoskeletal protein filamin, a pathway that shows differential activation in prostate epithelial versus prostate cancer cell lines. We further identify a novel FHL2-AR-filamin transcription complex, revealing how deregulation of this axis promotes the constitutive, ligand-independent activation of AR variants, which are present in CRPC. Critically, the calpain-cleaved filamin fragment and FHL2 are present in the nucleus only in CRPC and not benign prostate tissue or localized prostate cancer. Thus, our work provides mechanistic insight into the enhanced AR activation, most notably of the recently identified AR variants, including AR-V7 that drives CRPC progression. Furthermore, our results identify the first disease-specific mechanism for deregulation of FHL2 nuclear localization during cancer progression. These results offer general import beyond prostate cancer, given that nuclear FHL2 is characteristic of other human cancers where oncogenic transcription factors that drive disease are activated like the AR in prostate cancer.</div>
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   |type=    RBID
   |clé=     Pascal:13-0291216
   |texte=   Regulation of the Transcriptional Coactivator FHL2 Licenses Activation of the Androgen Receptor in Castrate-Resistant Prostate Cancer
}}

Wicri

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