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Dos Santos DZ, Elbaz M, Branchard E, Schormann W, Brown CE, Meek AR, Njar VCO, Hamilton RJ, Reed MA, Andrews DW, Penn LZ. Sterol-like drugs potentiate statin-triggered prostate cancer cell death by inhibiting SREBP2 nuclear translocation. Biomed Pharmacother 2024; 177:116934. [PMID: 38889639 DOI: 10.1016/j.biopha.2024.116934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 06/07/2024] [Accepted: 06/09/2024] [Indexed: 06/20/2024] Open
Abstract
There is an urgent need to provide immediate and effective options for the treatment of prostate cancer (PCa) to prevent progression to lethal castration-resistant PCa (CRPC). The mevalonate (MVA) pathway is dysregulated in PCa, and statin drugs commonly prescribed for hypercholesterolemia, effectively target this pathway. Statins exhibit anti-PCa activity, however the resulting intracellular depletion of cholesterol triggers a feedback loop that restores MVA pathway activity, thus diminishing statin efficacy and contributing to resistance. To identify drugs that block this feedback response and enhance the pro-apoptotic activity of statins, we performed a high-content image-based screen of a 1508 drug library, enriched for FDA-approved compounds. Two of the validated hits, Galeterone (GAL) and Quinestrol, share the cholesterol-related tetracyclic structure, which is also evident in the FDA-approved CRPC drug Abiraterone (ABI). Molecular modeling revealed that GAL, Quinestrol and ABI not only share structural similarity with 25-hydroxy-cholesterol (25HC) but were also predicted to bind similarly to a known protein-binding site of 25HC. This suggested GAL, Quinestrol and ABI are sterol-mimetics and thereby inhibit the statin-induced feedback response. Cell-based assays demonstrated that these agents inhibit nuclear translocation of sterol-regulatory element binding protein 2 (SREBP2) and the transcription of MVA genes. Sensitivity was independent of androgen status and the Fluva-GAL combination significantly impeded CRPC tumor xenograft growth. By identifying cholesterol-mimetic drugs that inhibit SREBP2 activation upon statin treatment, we provide a potent "one-two punch" against CRPC progression and pave the way for innovative therapeutic strategies to combat additional diseases whose etiology is associated with SREBP2 dysregulation.
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Affiliation(s)
| | - Mohamad Elbaz
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Toronto, ON M5G 1L7, Canada; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Helwan University, Ain Helwan, Helwan, Cairo, Egypt
| | - Emily Branchard
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Wiebke Schormann
- Biological Sciences, Sunnybrook Research Institute, Toronto, ON M4N 3M5, Canada
| | - Carla E Brown
- Krembil Research Institute, 60 Leonard Ave, Toronto, ON M5T 0S8, Canada
| | - Autumn R Meek
- Krembil Research Institute, 60 Leonard Ave, Toronto, ON M5T 0S8, Canada
| | - Vincent C O Njar
- Department of Pharmacology, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA; The Center for Biomolecular Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201, USA
| | - Robert J Hamilton
- Department of Surgical Oncology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - Mark A Reed
- Krembil Research Institute, 60 Leonard Ave, Toronto, ON M5T 0S8, Canada; Department of Pharmacology and Toxicology, Medical Sciences Building,1 King's College Circle, University of Toronto, M5S 1A8, Canada; Department of Chemistry, Lash Miller Building, 80 St. George Street, University of Toronto, Ontario M5S 3H6, Canada
| | - David W Andrews
- Biological Sciences, Sunnybrook Research Institute, Toronto, ON M4N 3M5, Canada; Department of Biochemistry, University of Toronto, 27 King's College Cir, Toronto, ON M5S 1A1, Canada; Department of Medical Biophysics, University of Toronto, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Linda Z Penn
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Toronto, ON M5G 1L7, Canada; Department of Medical Biophysics, University of Toronto, 101 College Street, Toronto, ON M5G 1L7, Canada.
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2
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Zhang B, Liu C, Yang Z, Zhang S, Hu X, Li B, Mao M, Wang X, Li Z, Ma S, Zhang S, Qin C. Discovery of BWA-522, a First-in-Class and Orally Bioavailable PROTAC Degrader of the Androgen Receptor Targeting N-Terminal Domain for the Treatment of Prostate Cancer. J Med Chem 2023; 66:11158-11186. [PMID: 37556600 DOI: 10.1021/acs.jmedchem.3c00585] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
We report small molecular PROTAC compounds targeting the androgen receptor N-terminal domain (AR-NTD), which were obtained by tethering AR-NTD antagonists and different classes of E3 ligase ligands through chemical linkers. A representative compound, BWA-522, effectively induces degradation of both AR-FL and AR-V7 and is more potent than the corresponding antagonist against prostate cancer (PC) cells in vitro. We have shown that the degradation of AR-FL and AR-V7 proteins by BWA-522 can suppress the expression of AR downstream proteins and induce PC cell apoptosis. BWA-522 achieves 40.5% oral bioavailability in mice and 69.3% in beagle dogs. In a LNCaP xenograft model study, BWA-522 was also proved to be an efficacious PROTAC degrader, resulting in 76% tumor growth inhibition after oral administration of a dose of 60 mg/kg. This study indicates that BWA-522 is a promising AR-NTD PROTAC for the treatment of AR-FL- and AR-V7-dependent tumors.
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Affiliation(s)
- Bowen Zhang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
| | - Chang Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
| | - Zhenqian Yang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
| | - Sai Zhang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
- Center for Targeted Protein Degradation and Drug Discovery, Ocean University of China, Qingdao, Shandong 266003, China
| | - Xiaolin Hu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
| | - Baohu Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
| | - Mei Mao
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
| | - Xiao Wang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
- Center for Targeted Protein Degradation and Drug Discovery, Ocean University of China, Qingdao, Shandong 266003, China
| | - Zhuoyue Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
- Center for Targeted Protein Degradation and Drug Discovery, Ocean University of China, Qingdao, Shandong 266003, China
| | - Shumin Ma
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
- Center for Targeted Protein Degradation and Drug Discovery, Ocean University of China, Qingdao, Shandong 266003, China
| | - Siqi Zhang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
- Center for Targeted Protein Degradation and Drug Discovery, Ocean University of China, Qingdao, Shandong 266003, China
| | - Chong Qin
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, China
- Center for Targeted Protein Degradation and Drug Discovery, Ocean University of China, Qingdao, Shandong 266003, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao, Shandong 266137, China
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3
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Blatt EB, Parra K, Neeb A, Buroni L, Bogdan D, Yuan W, Gao Y, Gilbreath C, Paschalis A, Carreira S, DeBerardinis RJ, Mani RS, de Bono JS, Raj GV. Critical role of antioxidant programs in enzalutamide-resistant prostate cancer. Oncogene 2023; 42:2347-2359. [PMID: 37355762 PMCID: PMC10752496 DOI: 10.1038/s41388-023-02756-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 05/22/2023] [Accepted: 06/13/2023] [Indexed: 06/26/2023]
Abstract
Therapy resistance to second-generation androgen receptor (AR) antagonists, such as enzalutamide, is common in patients with advanced prostate cancer (PCa). To understand the metabolic alterations involved in enzalutamide resistance, we performed metabolomic, transcriptomic, and cistromic analyses of enzalutamide-sensitive and -resistant PCa cells, xenografts, patient-derived organoids, patient-derived explants, and tumors. We noted dramatically higher basal and inducible levels of reactive oxygen species (ROS) in enzalutamide-resistant PCa and castration-resistant PCa (CRPC), in comparison to enzalutamide-sensitive PCa cells or primary therapy-naive tumors respectively. Unbiased metabolomic evaluation identified that glutamine metabolism was consistently upregulated in enzalutamide-resistant PCa cells and CRPC tumors. Stable isotope tracing studies suggest that this enhanced glutamine metabolism drives an antioxidant program that allows these cells to tolerate higher basal levels of ROS. Inhibition of glutamine metabolism with either a small-molecule glutaminase inhibitor or genetic knockout of glutaminase enhanced ROS levels, and blocked the growth of enzalutamide-resistant PCa. The critical role of compensatory antioxidant pathways in maintaining enzalutamide-resistant PCa cells was validated by targeting another antioxidant program driver, ferredoxin 1. Taken together, our data identify a metabolic need to maintain antioxidant programs and a potentially targetable metabolic vulnerability in enzalutamide-resistant PCa.
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Affiliation(s)
- Eliot B Blatt
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | - Karla Parra
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | - Antje Neeb
- The Institute of Cancer Research, London, UK
| | | | | | - Wei Yuan
- The Institute of Cancer Research, London, UK
| | - Yunpeng Gao
- Department of Pathology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | - Collin Gilbreath
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | | | | | - Ralph J DeBerardinis
- Children's Medical Center Research Institute, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX, 75390, USA
- Howard Hughes Medical Institute, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX, 75390, USA
| | - Ram S Mani
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
- Department of Pathology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA
| | - Johann S de Bono
- The Institute of Cancer Research, London, UK
- Institute of Cancer Research and the Royal Marsden NHS Foundation Trust, London, UK
| | - Ganesh V Raj
- Department of Urology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA.
- Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA.
- Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, 75390, USA.
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Gujrati H, Ha S, Wang BD. Deregulated microRNAs Involved in Prostate Cancer Aggressiveness and Treatment Resistance Mechanisms. Cancers (Basel) 2023; 15:3140. [PMID: 37370750 PMCID: PMC10296615 DOI: 10.3390/cancers15123140] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 06/06/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023] Open
Abstract
Prostate cancer (PCa) is the most frequently diagnosed cancer and the second leading cause of cancer deaths among American men. Complex genetic and epigenetic mechanisms are involved in the development and progression of PCa. MicroRNAs (miRNAs) are short noncoding RNAs that regulate protein expression at the post-transcriptional level by targeting mRNAs for degradation or inhibiting protein translation. In the past two decades, the field of miRNA research has rapidly expanded, and emerging evidence has revealed miRNA dysfunction to be an important epigenetic mechanism underlying a wide range of diseases, including cancers. This review article focuses on understanding the functional roles and molecular mechanisms of deregulated miRNAs in PCa aggressiveness and drug resistance based on the existing literature. Specifically, the miRNAs differentially expressed (upregulated or downregulated) in PCa vs. normal tissues, advanced vs. low-grade PCa, and treatment-responsive vs. non-responsive PCa are discussed. In particular, the oncogenic and tumor-suppressive miRNAs involved in the regulation of (1) the synthesis of the androgen receptor (AR) and its AR-V7 splice variant, (2) PTEN expression and PTEN-mediated signaling, (3) RNA splicing mechanisms, (4) chemo- and hormone-therapy resistance, and (5) racial disparities in PCa are discussed and summarized. We further provide an overview of the current advances and challenges of miRNA-based biomarkers and therapeutics in clinical practice for PCa diagnosis/prognosis and treatment.
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Affiliation(s)
- Himali Gujrati
- Department of Pharmaceutical Sciences, University of Maryland Eastern Shore School of Pharmacy, Princess Anne, MD 21853, USA
| | - Siyoung Ha
- Department of Pharmaceutical Sciences, University of Maryland Eastern Shore School of Pharmacy, Princess Anne, MD 21853, USA
| | - Bi-Dar Wang
- Department of Pharmaceutical Sciences, University of Maryland Eastern Shore School of Pharmacy, Princess Anne, MD 21853, USA
- Hormone Related Cancers Program, University of Maryland Greenebaum Comprehensive Cancer Center, Baltimore, MD 21201, USA
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5
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Hung CL, Liu HH, Fu CW, Yeh HH, Hu TL, Kuo ZK, Lin YC, Jhang MR, Hwang CS, Hsu HC, Kung HJ, Wang LY. Targeting androgen receptor and the variants by an orally bioavailable Proteolysis Targeting Chimeras compound in castration resistant prostate cancer. EBioMedicine 2023; 90:104500. [PMID: 36893587 PMCID: PMC10011747 DOI: 10.1016/j.ebiom.2023.104500] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 02/12/2023] [Accepted: 02/12/2023] [Indexed: 03/09/2023] Open
Abstract
BACKGROUND Despite the advent of improved therapeutic options for advanced prostate cancer, the durability of clinical benefits is limited due to inevitable development of resistance. By constitutively sustaining androgen receptor (AR) signaling, expression of ligand-binding domain truncated AR variants (AR-V(ΔLBD)) accounts for the major mechanism underlying the resistance to anti-androgen drugs. Strategies to target AR and its LBD truncated variants are needed to prevent the emergence or overcome drug resistance. METHODS We utilize Proteolysis Targeting Chimeras (PROTAC) technology to achieve induced degradation of both full-length AR (AR-FL) and AR-V(ΔLBD) proteins. In the ITRI-PROTAC design, an AR N-terminal domain (NTD) binding moiety is appended to von-Hippel-Lindau (VHL) or Cereblon (CRBN) E3 ligase binding ligand with linker. FINDINGS In vitro studies demonstrate that ITRI-PROTAC compounds mechanistically degrade AR-FL and AR-V(ΔLBD) proteins via ubiquitin-proteasome system, leading to impaired AR transactivation on target gene expression, and inhibited cell proliferation accompanied by apoptosis activation. The compounds also significantly inhibit enzalutamide-resistant growth of castration resistant prostate cancer (CRPC) cells. In castration-, enzalutamide-resistant CWR22Rv1 xenograft model without hormone ablation, ITRI-90 displays a pharmacokinetic profile with decent oral bioavailability and strong antitumor efficacy. INTERPRETATION AR NTD that governs the transcriptional activities of all active variants has been considered attractive therapeutic target to block AR signaling in prostate cancer cells. We demonstrated that utilizing PROTAC for induced AR protein degradation via NTD represents an efficient alternative therapeutic strategy for CRPC to overcome anti-androgen resistance. FUNDING The funding detail can be found in the Acknowledgements section.
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Affiliation(s)
- Chiu-Lien Hung
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Hao-Hsuan Liu
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Chih-Wei Fu
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Hsun-Hao Yeh
- Department of Biochemistry and Molecular Biology, Chang Gung University, Taoyuan 33302, Taiwan
| | - Tsan-Lin Hu
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Zong-Keng Kuo
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Yu-Chin Lin
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Mei-Ru Jhang
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Chrong-Shiong Hwang
- Department of Preclinical Drug Discovery Technology, Biomedical Technology and Devices Research Labs, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Hung-Chih Hsu
- Division of Hematology-Oncology, Chang Gung Memorial Hospital at Linkou, Taoyuan 33305, Taiwan; College of Medicine, Chang Gung University, Taoyuan 33305, Taiwan
| | - Hsing-Jien Kung
- Institute of Molecular and Genomic Medicine, National Health Research Institutes, Zhunan, Miaoli County 35053, Taiwan; Research Center of Cancer Translational Medicine, Taipei Medical University, Taipei 11031, Taiwan; Ph.D. Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 11031, Taiwan
| | - Ling-Yu Wang
- Department of Biochemistry and Molecular Biology, Chang Gung University, Taoyuan 33302, Taiwan; Division of Hematology-Oncology, Chang Gung Memorial Hospital at Linkou, Taoyuan 33305, Taiwan.
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6
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Helsen C, Nguyen TT, Lee XY, Eerlings R, Louros N, Schymkowitz J, Rousseau F, Claessens F, Voet A. Exploiting Ligand-binding Domain Dimerization for Development of Novel Androgen Receptor Inhibitors. Mol Cancer Ther 2022; 21:1823-1834. [PMID: 36218067 DOI: 10.1158/1535-7163.mct-22-0340] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 08/07/2022] [Accepted: 10/03/2022] [Indexed: 01/12/2023]
Abstract
Currently, all clinically used androgen receptor (AR) antagonists target the AR ligand-binding pocket and inhibit T and dihydrotestosterone (DHT) binding. Resistance to these inhibitors in prostate cancer frequently involves AR-dependent mechanisms resulting in a retained AR dependence of the tumor. More effective or alternative AR inhibitors are therefore required to limit progression in these resistant stages. Here, we applied the structural information of the ligand-binding domain (LBD) dimerization interface to screen in silico for inhibitors. A completely new binding site, the Dimerisation Inhibiting Molecules (DIM) pocket, was identified at the LBD dimerization interface. Selection of compounds that fit the DIM pocket via virtual screening identified the DIM20 family of compounds which inhibit AR transactivation and dimerization of the full-length AR as well as the isolated LBDs. Via biolayer interferometry, reversible dose-dependent binding to the LBD was confirmed. While DIM20 does not compete with 3H-DHT for binding in the LBP, it limits the maximal activity of the AR indicative of a noncompetitive binding to the LBD. DIM20 and DIM20.39 specifically inhibit proliferation of AR-positive prostate cancer cell lines, with only marginal effects on AR-negative cell lines such as HEK 293 and PC3. Moreover, combination treatment of DIM compounds with enzalutamide results in synergistic antiproliferative effects which underline the specific mechanism of action of the DIM compounds.
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Affiliation(s)
- Christine Helsen
- Laboratory of Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Tien T Nguyen
- Laboratory of Biomolecular Modelling and Design, Department of Chemistry, KU Leuven, Leuven, Belgium
| | - Xiao Yin Lee
- Laboratory of Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Roy Eerlings
- Laboratory of Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Nikolaos Louros
- Switch Laboratory, VIB-KU Leuven Center for Brain & Disease Research, Leuven, Belgium.,Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Joost Schymkowitz
- Switch Laboratory, VIB-KU Leuven Center for Brain & Disease Research, Leuven, Belgium.,Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Frederic Rousseau
- Switch Laboratory, VIB-KU Leuven Center for Brain & Disease Research, Leuven, Belgium.,Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Frank Claessens
- Laboratory of Molecular Endocrinology, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Arnout Voet
- Laboratory of Biomolecular Modelling and Design, Department of Chemistry, KU Leuven, Leuven, Belgium
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7
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Mai CW, Chin KY, Foong LC, Pang KL, Yu B, Shu Y, Chen S, Cheong SK, Chua CW. Modeling prostate cancer: What does it take to build an ideal tumor model? Cancer Lett 2022; 543:215794. [PMID: 35718268 DOI: 10.1016/j.canlet.2022.215794] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 06/10/2022] [Indexed: 11/17/2022]
Abstract
Prostate cancer is frequently characterized as a multifocal disease with great intratumoral heterogeneity as well as a high propensity to metastasize to bone. Consequently, modeling prostate tumor has remained a challenging task for researchers in this field. In the past decades, genomic advances have led to the identification of key molecular alterations in prostate cancer. Moreover, resistance towards second-generation androgen-deprivation therapy, namely abiraterone and enzalutamide has unveiled androgen receptor-independent diseases with distinctive histopathological and clinical features. In this review, we have critically evaluated the commonly used preclinical models of prostate cancer with respect to their capability of recapitulating the key genomic alterations, histopathological features and bone metastatic potential of human prostate tumors. In addition, we have also discussed the potential use of the emerging organoid models in prostate cancer research, which possess clear advantages over the commonly used preclinical tumor models. We anticipate that no single model can faithfully recapitulate the complexity of prostate cancer, and thus, propose the use of a cost- and time-efficient integrated tumor modeling approach for future prostate cancer investigations.
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Affiliation(s)
- Chun-Wai Mai
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China; Centre for Stem Cell Research, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Selangor, 43000, Malaysia
| | - Kok-Yong Chin
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China; Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, 56000, Malaysia
| | - Lian-Chee Foong
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China; Centre for Stem Cell Research, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Selangor, 43000, Malaysia
| | - Kok-Lun Pang
- Newcastle University Medicine Malaysia, Iskandar Puteri, 79200, Malaysia
| | - Bin Yu
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Yu Shu
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Sisi Chen
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Soon-Keng Cheong
- Centre for Stem Cell Research, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Selangor, 43000, Malaysia
| | - Chee Wai Chua
- State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
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8
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Kuznik NC, Solozobova V, Lee II, Jung N, Yang L, Nienhaus K, Ntim EA, Rottenberg JT, Muhle-Goll C, Kumar AR, Peravali R, Gräßle S, Gourain V, Deville C, Cato L, Neeb A, Dilger M, Cramer von Clausbruch CA, Weiss C, Kieffer B, Nienhaus GU, Brown M, Bräse S, Cato ACB. A chemical probe for BAG1 targets androgen receptor-positive prostate cancer through oxidative stress signaling pathway. iScience 2022; 25:104175. [PMID: 35479411 PMCID: PMC9036123 DOI: 10.1016/j.isci.2022.104175] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 03/01/2022] [Accepted: 03/25/2022] [Indexed: 11/16/2022] Open
Abstract
BAG1 is a family of polypeptides with a conserved C-terminal BAG domain that functions as a nucleotide exchange factor for the molecular chaperone HSP70. BAG1 proteins also control several signaling processes including proteostasis, apoptosis, and transcription. The largest isoform, BAG1L, controls the activity of the androgen receptor (AR) and is upregulated in prostate cancer. Here, we show that BAG1L regulates AR dynamics in the nucleus and its ablation attenuates AR target gene expression especially those involved in oxidative stress and metabolism. We show that a small molecule, A4B17, that targets the BAG domain downregulates AR target genes similar to a complete BAG1L knockout and upregulates the expression of oxidative stress-induced genes involved in cell death. Furthermore, A4B17 outperformed the clinically approved antagonist enzalutamide in inhibiting cell proliferation and prostate tumor development in a mouse xenograft model. BAG1 inhibitors therefore offer unique opportunities for antagonizing AR action and prostate cancer growth. BAG1L interacts with a sequence overlapping a polyalanine tract in the AR NTD Knockdown of BAG1L increase AR dynamics in the nucleus BAG1L uses ROS pathway to regulate AR+ prostate cancer cell proliferation A small molecule BAG1 inhibitor inhibits prostate tumor growth in mouse xenografts
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Affiliation(s)
- Nane C Kuznik
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Valeria Solozobova
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Irene I Lee
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Nicole Jung
- Institute of Biological and Chemical Systems, Functional Molecular Systems, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Linxiao Yang
- Institute of Applied Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Karin Nienhaus
- Institute of Applied Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Emmanuel A Ntim
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Jaice T Rottenberg
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Claudia Muhle-Goll
- Institute of Biological Interfaces 4, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Amrish Rajendra Kumar
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Ravindra Peravali
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Simone Gräßle
- Institute of Biological and Chemical Systems, Functional Molecular Systems, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Victor Gourain
- LabEx IGO "Immunotherapy, Graft, Oncology", Centre de Recherche en Transplantation et Immunologie - UMR1064, 44093 Nantes, France
| | - Célia Deville
- Department of Integrative Structural Biology, Institut de Génétique et de Biologie Moléculaire et Cellulaire, INSERM, U964, CNRS, UMR-7104, Université de Strasbourg, 67404 Illkirch-Graffenstaden, France
| | - Laura Cato
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Antje Neeb
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Marco Dilger
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Christina A Cramer von Clausbruch
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Carsten Weiss
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Bruno Kieffer
- Department of Integrative Structural Biology, Institut de Génétique et de Biologie Moléculaire et Cellulaire, INSERM, U964, CNRS, UMR-7104, Université de Strasbourg, 67404 Illkirch-Graffenstaden, France
| | - G Ulrich Nienhaus
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
- Institute of Applied Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
- Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Myles Brown
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Stefan Bräse
- Institute of Biological and Chemical Systems, Functional Molecular Systems, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
| | - Andrew C B Cato
- Institute of Biological and Chemical Systems, Biological Information Processing, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
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9
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Vorontsova SK, Zavarzin IV, Shirinian VZ, Bozhenko EI, Andreeva OE, Sorokin DV, Scherbakov AM, Minyaev ME. Synthesis and crystal structures of D-annulated pentacyclic steroids: looking within and beyond AR signalling in prostate cancer. CrystEngComm 2022. [DOI: 10.1039/d1ce01417j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbocyclic steroids D-annulated at 16α and 17α positions with a 5-membered ring E are easily accessible via the interrupted Nazarov cyclization. Three steroid series have been structurally studied: chlorine-containing D-annulated...
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10
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AR Structural Variants and Prostate Cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1390:195-211. [DOI: 10.1007/978-3-031-11836-4_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Erdmann É, Ould Madi Berthélémy P, Cottard F, Angel CZ, Schreyer E, Ye T, Morlet B, Negroni L, Kieffer B, Céraline J. Androgen receptor-mediated transcriptional repression targets cell plasticity in prostate cancer. Mol Oncol 2021; 16:2518-2536. [PMID: 34919781 PMCID: PMC9462842 DOI: 10.1002/1878-0261.13164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/16/2021] [Accepted: 12/15/2021] [Indexed: 11/24/2022] Open
Abstract
Androgen receptor (AR) signaling remains the key therapeutic target in the management of hormone‐naïve‐advanced prostate cancer (PCa) and castration‐resistant PCa (CRPC). Recently, landmark molecular features have been reported for CRPC, including the expression of constitutively active AR variants that lack the ligand‐binding domain. Besides their role in CRPC, AR variants lead to the expression of genes involved in tumor progression. However, little is known about the specificity of their mode of action compared with that of wild‐type AR (AR‐WT). We performed AR transcriptome analyses in an androgen‐dependent PCa cell line as well as cross‐analyses with publicly available RNA‐seq datasets and established that transcriptional repression capacity that was marked for AR‐WT was pathologically lost by AR variants. Functional enrichment analyses allowed us to associate AR‐WT repressive function to a panel of genes involved in cell adhesion and epithelial‐to‐mesenchymal transition. So, we postulate that a less documented AR‐WT normal function in prostate epithelial cells could be the repression of a panel of genes linked to cell plasticity and that this repressive function could be pathologically abrogated by AR variants in PCa.
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Affiliation(s)
- Éva Erdmann
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France
| | | | - Félicie Cottard
- University of Freiburg - Albert - Ludwigs - Universität Freiburg, Germany
| | | | - Edwige Schreyer
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France
| | - Tao Ye
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France
| | - Bastien Morlet
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France
| | - Luc Negroni
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France
| | - Bruno Kieffer
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France
| | - Jocelyn Céraline
- CNRS, UMR 7104, INSERM U1258 - IGBMC - University de Strasbourg, France.,Institut de Cancérologie de Strasbourg Europe (ICANS), Hôpitaux Universitaires de Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg - FMTS - Faculté de Médecine, Université de Strasbourg, France
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12
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Hamid ARAH, Luna-Velez MV, Dudek AM, Jansen CFJ, Smit F, Aalders TW, Verhaegh GW, Schaafsma E, Sedelaar JPM, Schalken JA. Molecular Phenotyping of AR Signaling for Predicting Targeted Therapy in Castration Resistant Prostate Cancer. Front Oncol 2021; 11:721659. [PMID: 34490120 PMCID: PMC8417043 DOI: 10.3389/fonc.2021.721659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 07/31/2021] [Indexed: 11/13/2022] Open
Abstract
Castration-resistant prostate cancer (CRPC) is defined by resistance of the tumor to androgen deprivation therapy (ADT). Several molecular changes, particularly in the AR signaling cascade, have been described that may explain ADT resistance. The variety of changes may also explain why the response to novel therapies varies between patients. Testing the specific molecular changes may be a major step towards personalized treatment of CRPC patients. The aim of our study was to evaluate the molecular changes in the AR signaling cascade in CRPC patients. We have developed and validated several methods which are easy to use, and require little tissue material, for exploring AR signaling pathway changes simultaneously. We found that the AR signaling pathway is still active in the majority of our CRPC patients, due to molecular changes in AR signaling components. There was heterogeneity in the molecular changes observed, but we could classify the patients into 4 major subgroups which are: AR mutation, AR amplification, active intratumoral steroidogenesis, and combination of AR amplification and active intratumoral steroidogenesis. We suggest characterizing the AR signaling pathway in CRPC patients before beginning any new treatment, and a recent fresh tissue sample from the prostate or a metastatic site should be obtained for the purpose of this characterization.
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Affiliation(s)
- Agus Rizal A H Hamid
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands.,Department of Urology, Ciptomangunkusumo Hospital, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia
| | - Maria V Luna-Velez
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Aleksandra M Dudek
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | | | | | - Tilly W Aalders
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Gerald W Verhaegh
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Ewout Schaafsma
- Department of Pathology, Radboud University Medical Center, Nijmegen, Netherlands
| | - John P M Sedelaar
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Jack A Schalken
- Department of Urology, Radboud University Medical Center, Nijmegen, Netherlands
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13
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Nagandla H, Robertson MJ, Putluri V, Putluri N, Coarfa C, Weigel NL. Isoform-specific Activities of Androgen Receptor and its Splice Variants in Prostate Cancer Cells. Endocrinology 2021; 162:6029774. [PMID: 33300995 PMCID: PMC8253248 DOI: 10.1210/endocr/bqaa227] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Indexed: 12/18/2022]
Abstract
Androgen receptor (AR) signaling continues to drive castration-resistant prostate cancer (CRPC) in spite of androgen deprivation therapy (ADT). Constitutively active shorter variants of AR, lacking the ligand binding domain, are frequently expressed in CRPC and have emerged as a potential mechanism for prostate cancer to escape ADT. ARv7 and ARv567es are 2 of the most commonly detected variants of AR in clinical samples of advanced, metastatic prostate cancer. It is not clear if variants of AR merely act as weaker substitutes for AR or can mediate unique isoform-specific activities different from AR. In this study, we employed LNCaP prostate cancer cell lines with inducible expression of ARv7 or ARv567es to delineate similarities and differences in transcriptomics, metabolomics, and lipidomics resulting from the activation of AR, ARv7, or ARv567es. While the majority of target genes were similarly regulated by the action of all 3 isoforms, we found a clear difference in transcriptomic activities of AR versus the variants, and a few differences between ARv7 and ARv567es. Some of the target gene regulation by AR isoforms was similar in the VCaP background as well. Differences in downstream activities of AR isoforms were also evident from comparison of the metabolome and lipidome in an LNCaP model. Overall our study implies that shorter variants of AR are capable of mediating unique downstream activities different from AR and some of these are isoform specific.
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Affiliation(s)
- Harika Nagandla
- Department of Molecular and Cellular Biology, Baylor
College of Medicine, Houston, TX, USA
| | - Matthew J Robertson
- Department of Molecular and Cellular Biology, Baylor
College of Medicine, Houston, TX, USA
| | - Vasanta Putluri
- Advanced Technology Core, Alkek Center for Molecular
Discovery
| | - Nagireddy Putluri
- Department of Molecular and Cellular Biology, Baylor
College of Medicine, Houston, TX, USA
| | - Cristian Coarfa
- Department of Molecular and Cellular Biology, Baylor
College of Medicine, Houston, TX, USA
- Correspondence: Nancy L. Weigel and
Cristian Coarfa, Department of Molecular & Cellular Biology, Baylor College
of Medicine, Houston, TX 77030, USA. ,
| | - Nancy L Weigel
- Department of Molecular and Cellular Biology, Baylor
College of Medicine, Houston, TX, USA
- Correspondence: Nancy L. Weigel and
Cristian Coarfa, Department of Molecular & Cellular Biology, Baylor College
of Medicine, Houston, TX 77030, USA. ,
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14
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Novel steroidal 1,3,4-thiadiazines: Synthesis and biological evaluation in androgen receptor-positive prostate cancer 22Rv1 cells. Bioorg Chem 2019; 91:103142. [PMID: 31400555 DOI: 10.1016/j.bioorg.2019.103142] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 12/20/2022]
Abstract
A flexible approach to previously unknown spirofused and linked 1,3,4-thiadiazine derivatives of steroids with selective control of heterocyclization patterns is disclosed. (N-Arylcarbamoyl)spiroandrostene-17,6' [1,3,4]thiadiazines and (N-arylcarbamoyl)17-[1',3',4']thiadiazine-substituted androstenes, novel types of heterosteroids, were prepared from 16β,17β-epoxypregnenolone and 21-bromopregna-5,16-dien-20-one in good to high yields by the treatment with oxamic acid thiohydrazides. The synthesized compounds were screened for antiproliferative activity against the human androgen receptor-positive prostate cancer cell line 22Rv1. Most of (N-arylcarbamoyl)17-[1',3',4']thiadiazine-substituted androstenes exhibit better antiproliferative potency (IC50 = 2.1-6.6 µM) than the antiandrogen bicalutamide. Compounds 7d with IC50 = 3.0 μM and 7j with IC50 = 2.1 μM proved to be the most active in the series under study. Lead synthesized compound 7j downregulates AR expression and activity in 22Rv1 cells. NF-κB activity is also blocked in 7j-treated 22Rv1 cells. Apoptosis is considered as a possible mechanism of 7j-induced cell death.
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15
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Xia N, Cui J, Zhu M, Xing R, Lu Y. Androgen receptor variant 12 promotes migration and invasion by regulating MYLK in gastric cancer. J Pathol 2019; 248:304-315. [PMID: 30737779 DOI: 10.1002/path.5257] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 01/14/2019] [Accepted: 02/06/2019] [Indexed: 12/30/2022]
Abstract
Androgen receptor (AR) and its variants (AR-Vs) promote tumorigenesis and metastasis in many hormone-related cancers, such as breast, prostate and hepatocellular cancers. However, the expression patterns and underlying molecular mechanisms of AR in gastric cancer (GC) are not fully understood. This study aimed to detect the expression of AR-Vs in GC and explored their role in metastasis of GC. Here, the AR expression form was identified in GC cell lines and tissues by RT-PCR and qPCR. Transwell assays and experimental lung metastasis animal models were used to assess the function of AR in cell migration and invasion. Downstream targets of AR were screened by bioinformatics, and identified by luciferase reporter assays and electrophoretic mobility shift assays. AR-v12 was identified as the main expression form in GC cell lines and tissues. Different from full length of AR, AR-v12 was localized to the nucleus independent of androgen. Upregulation of AR-v12 in primary GC tissues was significantly associated with metastasis. Overexpression of AR-v12 promoted migration and invasion independent of androgen. Knockdown of AR-v12 inhibited migration and invasion in vitro, as well as metastasis in vivo. Furthermore, AR-v12, serving as a transcription factor, promoted metastasis through regulating the promoter activity of MYLK. In AR-v12 overexpressing cells, knockdown of MYLK inhibited cell migration and invasion, while in AR-v12 knocked-down cells, overexpression of MYLK promoted cell migration and invasion. Collectively, our study demonstrates that AR-v12 is highly expressed in GC tissues and promotes migration and invasion through directly regulating MYLK. Copyright © 2019 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Nan Xia
- Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute, Beijing 100142, PR China
| | - Jiantao Cui
- Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute, Beijing 100142, PR China
| | - Min Zhu
- Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute, Beijing 100142, PR China
| | - Rui Xing
- Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute, Beijing 100142, PR China
| | - Youyong Lu
- Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute, Beijing 100142, PR China.,Department of Medical Oncology, Beijing Hospital, Beijing 100730, PR China
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16
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Magani F, Bray ER, Martinez MJ, Zhao N, Copello VA, Heidman L, Peacock SO, Wiley DJ, D'Urso G, Burnstein KL. Identification of an oncogenic network with prognostic and therapeutic value in prostate cancer. Mol Syst Biol 2018; 14:e8202. [PMID: 30108134 PMCID: PMC6684952 DOI: 10.15252/msb.20188202] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 07/11/2018] [Accepted: 07/17/2018] [Indexed: 12/15/2022] Open
Abstract
Identifying critical pathways governing disease progression is essential for accurate prognosis and effective therapy. We developed a broadly applicable and novel systems-level gene discovery strategy. This approach focused on constitutively active androgen receptor (AR) splice variant-driven pathways as representative of an intractable mechanism of prostate cancer (PC) therapeutic resistance. We performed a meta-analysis of human prostate samples using weighted gene co-expression network analysis combined with experimental AR variant transcriptome analyses. An AR variant-driven gene module that is upregulated during human PC progression was identified. We filtered this module by identifying genes that functionally interacted with AR variants using a high-throughput synthetic genetic array screen in Schizosaccharomyces pombe This strategy identified seven AR variant-regulated genes that also enhance AR activity and drive cancer progression. Expression of the seven genes predicted poor disease-free survival in large independent PC patient cohorts. Pharmacologic inhibition of interacting members of the gene set potently and synergistically decreased PC cell proliferation. This unbiased and novel gene discovery strategy identified a clinically relevant, oncogenic, interacting gene hub with strong prognostic and therapeutic potential in PC.
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Affiliation(s)
- Fiorella Magani
- Sheila and David Fuente Graduate Program in Cancer Biology, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Eric R Bray
- Department of Neurological Surgery, Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Maria J Martinez
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Ning Zhao
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Valeria A Copello
- Sheila and David Fuente Graduate Program in Cancer Biology, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Laine Heidman
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Stephanie O Peacock
- Sheila and David Fuente Graduate Program in Cancer Biology, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - David J Wiley
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Gennaro D'Urso
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Kerry L Burnstein
- Department of Molecular and Cellular Pharmacology, University of Miami Miller School of Medicine, Miami, FL, USA
- Sylvester Comprehensive Cancer Center (SCCC), Miami, FL, USA
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17
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Androgen receptor isoforms expression in benign prostatic hyperplasia and primary prostate cancer. PLoS One 2018; 13:e0200613. [PMID: 30028845 PMCID: PMC6054396 DOI: 10.1371/journal.pone.0200613] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 06/30/2018] [Indexed: 11/19/2022] Open
Abstract
The role of molecular changes in the androgen receptor (AR) as AR variants (AR-Vs) is not clear in the pathophysiology of benign prostatic hyperplasia (BPH) and hormone-naïve PCa. The aim of the current work was to identify the presence of AR isoforms in benign tissue and primary PCa, and to evaluate the possible association with tumor aggressiveness and biochemical recurrence in primary PCa. The mRNA levels of full length AR (AR-FL) and AR-Vs (AR-V1, AR-V4 and AR-V7) were measured using RT-qPCR. The protein expression of AR-FL (AR-CTD and AR-NTD) and AR-V7 were evaluated by the H-Score in immunohistochemistry (IHC). All investigated mRNA targets were expressed both in BPH and PCa. AR-FL mRNA levels were similar in both groups. AR-V4 mRNA expression showed higher levels in BPH, and AR-V1 and AR-V7 mRNA expression were higher in PCa. The AR-V7 protein showed a similar H-Score in both groups, while AR-CTD and AR-NTD were higher in nuclei of epithelial cells from BPH. These results support the assumption that these constitutively active isoforms of AR are involved in the pathophysiology of primary PCa and BPH. The role of AR-Vs and their possible modulation by steroid tissue levels in distinct types of prostate tumors needs to be elucidated to help guide the best clinical management of these diseases.
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18
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Lima AR, Araújo AM, Pinto J, Jerónimo C, Henrique R, Bastos MDL, Carvalho M, Guedes de Pinho P. Discrimination between the human prostate normal and cancer cell exometabolome by GC-MS. Sci Rep 2018; 8:5539. [PMID: 29615722 PMCID: PMC5882858 DOI: 10.1038/s41598-018-23847-9] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 03/13/2018] [Indexed: 12/23/2022] Open
Abstract
Serum prostate-specific antigen (PSA) is currently the most used biomarker in clinical practice for prostate cancer (PCa) detection. However, this biomarker has several drawbacks. In this work, an untargeted gas chromatography-mass spectrometry (GC-MS)-based metabolomic profiling of PCa cells was performed to prove the concept that metabolic alterations might differentiate PCa cell lines from normal prostate cell line. For that, we assessed the differences in volatile organic compounds (VOCs) profile in the extracellular medium (exometabolome) of four PCa cell lines and one normal prostate cell line at two pH values (pH 2 and 7) by GC-MS. Multivariate analysis revealed a panel of volatile metabolites that discriminated cancerous from normal prostate cells. The most altered metabolites included ketones, aldehydes and organic acids. Among these, we highlight pentadecane-2-one and decanoic acid, which were significantly increased in PCa compared to normal cells, and cyclohexanone, 4-methylheptan-2-one, 2-methylpentane-1,3-diol, 4-methylbenzaldehyde, 1-(3,5-dimethylfuran-2-yl)ethanone, methyl benzoate and nonanoic acid, which were significantly decreased in PCa cells. The PCa volatilome was markedly influenced by the VOCs extraction pH, though the discriminant capability was similar. Overall, our data suggest that VOCs monitoring has the potential to be used as a PCa screening methodology.
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Affiliation(s)
- Ana Rita Lima
- UCIBIO/REQUIMTE, Department of Biological Sciences, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal.
| | - Ana Margarida Araújo
- UCIBIO/REQUIMTE, Department of Biological Sciences, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal
| | - Joana Pinto
- UCIBIO/REQUIMTE, Department of Biological Sciences, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal
| | - Carmen Jerónimo
- Cancer Biology & Epigenetics Group, Research Center (CI-IPOP) Portuguese Oncology Institute of Porto (IPO Porto), Porto, Portugal.,Department of Pathology and Molecular Immunology-Biomedical Sciences Institute (ICBAS), University of Porto, Porto, Portugal
| | - Rui Henrique
- Cancer Biology & Epigenetics Group, Research Center (CI-IPOP) Portuguese Oncology Institute of Porto (IPO Porto), Porto, Portugal.,Department of Pathology and Molecular Immunology-Biomedical Sciences Institute (ICBAS), University of Porto, Porto, Portugal.,Department of Pathology, Portuguese Oncology Institute of Porto (IPO Porto), Porto, Portugal
| | - Maria de Lourdes Bastos
- UCIBIO/REQUIMTE, Department of Biological Sciences, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal
| | - Márcia Carvalho
- UCIBIO/REQUIMTE, Department of Biological Sciences, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal.,UFP Energy, Environment and Health Research Unit (FP-ENAS), University Fernando Pessoa, Porto, Portugal
| | - Paula Guedes de Pinho
- UCIBIO/REQUIMTE, Department of Biological Sciences, Laboratory of Toxicology, Faculty of Pharmacy, University of Porto, Porto, Portugal.
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19
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GC-MS-Based Endometabolome Analysis Differentiates Prostate Cancer from Normal Prostate Cells. Metabolites 2018; 8:metabo8010023. [PMID: 29562689 PMCID: PMC5876012 DOI: 10.3390/metabo8010023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 03/12/2018] [Accepted: 03/16/2018] [Indexed: 12/14/2022] Open
Abstract
Prostate cancer (PCa) is an important health problem worldwide. Diagnosis and management of PCa is very complex because the detection of serum prostate specific antigen (PSA) has several drawbacks. Metabolomics brings promise for cancer biomarker discovery and for better understanding PCa biochemistry. In this study, a gas chromatography–mass spectrometry (GC-MS) based metabolomic profiling of PCa cell lines was performed. The cell lines include 22RV1 and LNCaP from PCa with androgen receptor (AR) expression, DU145 and PC3 (which lack AR expression), and one normal prostate cell line (PNT2). Regarding the metastatic potential, PC3 is from an adenocarcinoma grade IV with high metastatic potential, DU145 has a moderate metastatic potential, and LNCaP has a low metastatic potential. Using multivariate analysis, alterations in levels of several intracellular metabolites were detected, disclosing the capability of the endometabolome to discriminate all PCa cell lines from the normal prostate cell line. Discriminant metabolites included amino acids, fatty acids, steroids, and sugars. Six stood out for the separation of all the studied PCa cell lines from the normal prostate cell line: ethanolamine, lactic acid, β-Alanine, L-valine, L-leucine, and L-tyrosine.
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20
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Crosstalk between the Androgen Receptor and PPAR Gamma Signaling Pathways in the Prostate. PPAR Res 2017; 2017:9456020. [PMID: 29181019 PMCID: PMC5664321 DOI: 10.1155/2017/9456020] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Revised: 08/29/2017] [Accepted: 09/14/2017] [Indexed: 01/07/2023] Open
Abstract
Nuclear receptors are a superfamily of ligand-activated transcription factors that play critical roles in the regulation of normal biological processes and several disease states. Of the nuclear receptors expressed within the prostate, the androgen receptor (AR) promotes the differentiation of prostatic epithelial cells and stimulates production of enzymes needed for liquefaction of semen. Multiple forms of AR also promote the growth of both early and late stage prostate cancers. As a result, drugs that target the AR signaling pathway are routinely used to treat patients with advanced forms of prostate cancer. Data also suggest that a second member of the nuclear receptor superfamily, the peroxisome proliferator activated receptor gamma (PPARγ), is a tumor suppressor that regulates growth of normal prostate and prostate cancers. Recent studies indicate there is a bidirectional interaction between AR and PPARγ, with each receptor influencing the expression and/or activity of the other within prostatic tissues. In this review, we examine how AR and PPARγ each regulate the growth and development of normal prostatic epithelial cells and prostate cancers. We also discuss interactions between the AR and PPARγ signaling pathways and how those interactions may influence prostate biology.
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21
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Uo T, Plymate SR, Sprenger CC. Allosteric alterations in the androgen receptor and activity in prostate cancer. Endocr Relat Cancer 2017; 24:R335-R348. [PMID: 28808043 PMCID: PMC6812555 DOI: 10.1530/erc-17-0108] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 07/13/2017] [Indexed: 12/19/2022]
Abstract
Organisms have evolved to generate biological complexity in their proteome and transcriptome from a limited number of genes. This concept holds true for the androgen receptor, which displays a diversity of inclusion/exclusion events in its structural motifs as a mechanism of resistance to the most forefront anti-androgen therapies. More than 20 androgen receptor variants that lack various portions of ligand-binding domain have been identified in human prostate cancer (PCa) samples. Most of the variants are inactive on their own, with a few exceptions displaying constitutive activity. The full-length receptor and one or more variants can be co-expressed in the same cell under many circumstances, which raises the question of how these variants physically and functionally interact with the full-length receptor or one another in the course of PCa progression. To address this issue, in this review, we will characterize and discuss androgen receptor variants, including the novel variants discovered in the last couple of years (i) individually, (ii) with respect to their physical and functional interaction with one another and (iii) in clinical relevance. Here, we also introduce the very recent understanding of AR-Vs obtained through successful development of some AR-V-specific antibodies as well as identification of novel AR-Vs by data mining approaches.
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Affiliation(s)
- Takuma Uo
- Department of MedicineUniversity of Washington, Seattle, Washington, USA
| | - Stephen R Plymate
- Department of MedicineUniversity of Washington, Seattle, Washington, USA
- Geriatrics Research Education and Clinical CenterVA Puget Sound Health Care System, Seattle, Washington, USA
| | - Cynthia C Sprenger
- Department of MedicineUniversity of Washington, Seattle, Washington, USA
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22
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Cottard F, Madi-Berthélémy PO, Erdmann E, Schaff-Wendling F, Keime C, Ye T, Kurtz JE, Céraline J. Dual effects of constitutively active androgen receptor and full-length androgen receptor for N-cadherin regulation in prostate cancer. Oncotarget 2017; 8:72008-72020. [PMID: 29069764 PMCID: PMC5641107 DOI: 10.18632/oncotarget.18270] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 05/12/2017] [Indexed: 12/18/2022] Open
Abstract
Constitutively active androgen receptor (AR) variants have been involved in the expression of mesenchymal markers such as N-cadherin in prostate cancer (PCa). However, the underlying molecular mechanisms remain elusive. It remains unclear, whether N-cadherin gene (CDH2) is a direct transcriptional target of AR variants or whether the observed upregulation is due to indirect effects through additional regulatory factors. Moreover, the specific contribution of full-length AR and AR variants in N-cadherin regulation in PCa has never been explored deeply. To investigate this, we artificially mimicked the co-expression of AR variants together with a full-length AR and performed miRNA-seq, RNA-seq and ChIP assays. Our results were in favor of a direct AR variants action on CDH2. Our data also revealed a distinctive mode of action between full-length AR and AR variants to regulate N-cadherin expression. Both wild type AR and AR variants could interact with a regulatory element in intron 1 of CDH2. However, a higher histone H4 acetylation in this genomic region was only observed with AR variants. This suggests that full-length AR may play an occluding function to impede CDH2 upregulation. Our data further highlighted a negative effect of AR variants on the expression of the endogenous full-length AR in LNCaP. These differences in the mode of action of AR variants and full-length AR for the control of one key gene for prostate cancer progression could be worth considering for targeting AR variants in PCa.
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Affiliation(s)
| | | | - Eva Erdmann
- Université de Strasbourg, INSERM, FMTS, Strasbourg, France
| | - Frédérique Schaff-Wendling
- Université de Strasbourg, INSERM, FMTS, Strasbourg, France.,Service d'Onco-Hématologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Céline Keime
- Université de Strasbourg, CNRS, INSERM, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch-Graffenstaden, France
| | - Tao Ye
- Université de Strasbourg, CNRS, INSERM, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch-Graffenstaden, France
| | - Jean-Emmanuel Kurtz
- Université de Strasbourg, INSERM, FMTS, Strasbourg, France.,Service d'Onco-Hématologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Jocelyn Céraline
- Université de Strasbourg, INSERM, FMTS, Strasbourg, France.,Service d'Onco-Hématologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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23
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Bui AT, Huang ME, Havard M, Laurent-Tchenio F, Dautry F, Tchenio T. Transient exposure to androgens induces a remarkable self-sustained quiescent state in dispersed prostate cancer cells. Cell Cycle 2017; 16:879-893. [PMID: 28426320 DOI: 10.1080/15384101.2017.1310345] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Cellular quiescence is a reversible cell growth arrest that is often assumed to require a persistence of non-permissive external growth conditions for its maintenance. In this work, we showed that androgen could induce a quiescent state that is self-sustained in a cell-autonomous manner through a "hit and run" mechanism in androgen receptor-expressing prostate cancer cells. This phenomenon required the set-up of a sustained redox imbalance and TGFβ/BMP signaling that were dependent on culturing cells at low density. At medium cell density, androgens failed to induce such a self-sustained quiescent state, which correlated with a lesser induction of cell redox imbalance and oxidative stress markers like CDKN1A. These effects of androgens could be mimicked by transient overexpression of CDKN1A that triggered its own expression and a sustained SMAD phosphorylation in cells cultured at low cell density. Overall, our data suggest that self-sustained but fully reversible quiescent states might constitute a general response of dispersed cancer cells to stress conditions.
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Affiliation(s)
- Anh Thu Bui
- a LBPA , UMR8113 ENS Cachan - CNRS, Ecole Normale Supérieure de Cachan , Cachan, Cedex , France
| | - Meng-Er Huang
- b Institut Curie, PSL Research University, CNRS UMR3348, Université Paris-Saclay , Orsay , France
| | - Maryline Havard
- a LBPA , UMR8113 ENS Cachan - CNRS, Ecole Normale Supérieure de Cachan , Cachan, Cedex , France
| | - Fanny Laurent-Tchenio
- a LBPA , UMR8113 ENS Cachan - CNRS, Ecole Normale Supérieure de Cachan , Cachan, Cedex , France
| | - François Dautry
- a LBPA , UMR8113 ENS Cachan - CNRS, Ecole Normale Supérieure de Cachan , Cachan, Cedex , France
| | - Thierry Tchenio
- a LBPA , UMR8113 ENS Cachan - CNRS, Ecole Normale Supérieure de Cachan , Cachan, Cedex , France
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24
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Wilson S, Qi J, Filipp FV. Refinement of the androgen response element based on ChIP-Seq in androgen-insensitive and androgen-responsive prostate cancer cell lines. Sci Rep 2016; 6:32611. [PMID: 27623747 PMCID: PMC5021938 DOI: 10.1038/srep32611] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 08/03/2016] [Indexed: 01/04/2023] Open
Abstract
Sequence motifs are short, recurring patterns in DNA that can mediate sequence-specific binding for proteins such as transcription factors or DNA modifying enzymes. The androgen response element (ARE) is a palindromic, dihexameric motif present in promoters or enhancers of genes targeted by the androgen receptor (AR). Using chromatin immunoprecipitation sequencing (ChIP-Seq) we refined AR-binding and AREs at a genome-scale in androgen-insensitive and androgen-responsive prostate cancer cell lines. Model-based searches identified more than 120,000 ChIP-Seq motifs allowing for expansion and refinement of the ARE. We classified AREs according to their degeneracy and their transcriptional involvement. Additionally, we quantified ARE utilization in response to somatic copy number amplifications, AR splice-variants, and steroid treatment. Although imperfect AREs make up 99.9% of the motifs, the degree of degeneracy correlates negatively with validated transcriptional outcome. Weaker AREs, particularly ARE half sites, benefit from neighboring motifs or cooperating transcription factors in regulating gene expression. Taken together, ARE full sites generate a reliable transcriptional outcome in AR positive cells, despite their low genome-wide abundance. In contrast, the transcriptional influence of ARE half sites can be modulated by cooperating factors.
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Affiliation(s)
- Stephen Wilson
- Systems Biology and Cancer Metabolism, Program for Quantitative Systems Biology, University of California Merced, 2500 North Lake Road, Merced, CA 95343, USA
| | - Jianfei Qi
- Marlene and Stewart Greenebaum Cancer Center, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 655 West Baltimore Street, Baltimore MD 21201, USA
| | - Fabian V Filipp
- Systems Biology and Cancer Metabolism, Program for Quantitative Systems Biology, University of California Merced, 2500 North Lake Road, Merced, CA 95343, USA
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25
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Wang Y, Dehigaspitiya DC, Levine PM, Profit AA, Haugbro M, Imberg-Kazdan K, Logan SK, Kirshenbaum K, Garabedian MJ. Multivalent Peptoid Conjugates Which Overcome Enzalutamide Resistance in Prostate Cancer Cells. Cancer Res 2016; 76:5124-32. [PMID: 27488525 DOI: 10.1158/0008-5472.can-16-0385] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 06/07/2016] [Indexed: 12/29/2022]
Abstract
Development of resistance to antiandrogens for treating advanced prostate cancer is a growing concern and extends to recently developed therapeutics, including enzalutamide. Therefore, new strategies to block androgen receptor (AR) function in prostate cancer are required. Here, we report the characterization of a multivalent conjugate presenting two bioactive ethisterone ligands arrayed as spatially defined pendant groups on a peptoid oligomer. The conjugate, named Multivalent Peptoid Conjugate 6 (MPC6), suppressed the proliferation of multiple AR-expressing prostate cancer cell lines including those that failed to respond to enzalutamide and ARN509. The structure-activity relationships of MPC6 variants were evaluated, revealing that increased spacing between ethisterone moieties and changes in peptoid topology eliminated its antiproliferative effect, suggesting that both ethisterone ligand presentation and scaffold characteristics contribute to MPC6 activity. Mechanistically, MPC6 blocked AR coactivator-peptide interaction and prevented AR intermolecular interactions. Protease sensitivity assays suggested that the MPC6-bound AR induced a receptor conformation distinct from that of dihydrotestosterone- or enzalutamide-bound AR. Pharmacologic studies revealed that MPC6 was metabolically stable and displayed a low plasma clearance rate. Notably, MPC6 treatment reduced tumor growth and decreased Ki67 and AR expression in mouse xenograft models of enzalutamide-resistant LNCaP-abl cells. Thus, MPC6 represents a new class of compounds with the potential to combat treatment-resistant prostate cancer. Cancer Res; 76(17); 5124-32. ©2016 AACR.
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Affiliation(s)
- Yu Wang
- Department of Urology, New York University School of Medicine, New York, New York
| | | | - Paul M Levine
- Department of Chemistry, New York University, New York, New York
| | - Adam A Profit
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, New York
| | - Michael Haugbro
- Department of Chemistry, New York University, New York, New York
| | - Keren Imberg-Kazdan
- Department of Microbiology, New York University School of Medicine, New York, New York
| | - Susan K Logan
- Department of Urology, New York University School of Medicine, New York, New York. Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York
| | - Kent Kirshenbaum
- Department of Chemistry, New York University, New York, New York
| | - Michael J Garabedian
- Department of Urology, New York University School of Medicine, New York, New York. Department of Microbiology, New York University School of Medicine, New York, New York.
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26
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Current Stem Cell Biomarkers and Their Functional Mechanisms in Prostate Cancer. Int J Mol Sci 2016; 17:ijms17071163. [PMID: 27447616 PMCID: PMC4964535 DOI: 10.3390/ijms17071163] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 07/07/2016] [Accepted: 07/09/2016] [Indexed: 12/12/2022] Open
Abstract
Currently there is little effective treatment available for castration resistant prostate cancer, which is responsible for the majority of prostate cancer related deaths. Emerging evidence suggested that cancer stem cells might play an important role in resistance to traditional cancer therapies, and the studies of cancer stem cells (including specific isolation and targeting on those cells) might benefit the discovery of novel treatment of prostate cancer, especially castration resistant disease. In this review, we summarized major biomarkers for prostate cancer stem cells, as well as their functional mechanisms and potential application in clinical diagnosis and treatment of patients.
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Hagberg Thulin M, Nilsson ME, Thulin P, Céraline J, Ohlsson C, Damber JE, Welén K. Osteoblasts promote castration-resistant prostate cancer by altering intratumoral steroidogenesis. Mol Cell Endocrinol 2016; 422:182-191. [PMID: 26586211 DOI: 10.1016/j.mce.2015.11.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 11/10/2015] [Accepted: 11/10/2015] [Indexed: 11/23/2022]
Abstract
The skeleton is the preferred site for prostate cancer (PC) metastasis leading to incurable castration-resistant disease. The increased expression of genes encoding steroidogenic enzymes found in bone metastatic tissue from patients suggests that up-regulated steroidogenesis might contribute to tumor growth at the metastatic site. Because of the overall sclerotic phenotype, we hypothesize that osteoblasts regulate the intratumoral steroidogenesis of castration resistant prostate cancer (CRPC) in bone. We here show that osteoblasts alter the steroidogenic transcription program in CRPC cells, closely mimicking the gene expression pattern described in CRPC. Osteoblast-stimulated LNCaP-19 cells displayed an increased expression of genes encoding for steroidogenic enzymes (CYP11A1, HSD3B1, and AKR1C3), estrogen signaling-related genes (CYP19A1, and ESR2), and genes for DHT-inactivating enzymes (UGT2B7, UGT2B15, and UGT2B17). The observed osteoblast-induced effect was exclusive to osteogenic CRPC cells (LNCaP-19) in contrast to osteolytic PC-3 and androgen-dependent LNCaP cells. The altered steroid enzymatic pattern was specific for the intratibial tumors and verified by immunohistochemistry in tissue specimens from LNCaP-19 xenograft tumors. Additionally, the overall steroidogenic effect was reflected by corresponding levels of progesterone and testosterone in serum from castrated mice with intratibial xenografts. A bi-directional interplay was demonstrated since both proliferation and Esr2 expression of osteoblasts were induced by CRPC cells in steroid-depleted conditions. Together, our results demonstrate that osteoblasts are important mediators of the intratumoral steroidogenesis of CRPC and for castration-resistant growth in bone. Targeting osteoblasts may therefore be important in the development of new therapeutic approaches.
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Affiliation(s)
- Malin Hagberg Thulin
- Sahlgrenska Cancer Center, Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Maria E Nilsson
- Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Pontus Thulin
- Sahlgrenska Cancer Center, Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Jocelyn Céraline
- INSERM UMR_S 1113, FMTS, Université de Strasbourg, Strasbourg, France
| | - Claes Ohlsson
- Center for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Jan-Erik Damber
- Sahlgrenska Cancer Center, Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Karin Welén
- Sahlgrenska Cancer Center, Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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28
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Shi XB, Ma AH, Xue L, Li M, Nguyen HG, Yang JC, Tepper CG, Gandour-Edwards R, Evans CP, Kung HJ, deVere White RW. miR-124 and Androgen Receptor Signaling Inhibitors Repress Prostate Cancer Growth by Downregulating Androgen Receptor Splice Variants, EZH2, and Src. Cancer Res 2015; 75:5309-17. [PMID: 26573802 DOI: 10.1158/0008-5472.can-14-0795] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Accepted: 09/19/2015] [Indexed: 01/08/2023]
Abstract
miR-124 targets the androgen receptor (AR) transcript, acting as a tumor suppressor to broadly limit the growth of prostate cancer. In this study, we unraveled the mechanisms through which miR-124 acts in this setting. miR-124 inhibited proliferation of prostate cancer cells in vitro and sensitized them to inhibitors of androgen receptor signaling. Notably, miR-124 could restore the apoptotic response of cells resistant to enzalutamide, a drug approved for the treatment of castration-resistant prostate cancer. We used xenograft models to examine the effects of miR-124 in vivo when complexed with polyethylenimine-derived nanoparticles. Intravenous delivery of miR-124 was sufficient to inhibit tumor growth and to increase tumor cell apoptosis in combination with enzalutamide. Mechanistic investigations revealed that miR-124 directly downregulated AR splice variants AR-V4 and V7 along with EZH2 and Src, oncogenic targets that have been reported to contribute to prostate cancer progression and treatment resistance. Taken together, our results offer a preclinical rationale to evaluate miR-124 for cancer treatment.
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Affiliation(s)
- Xu-Bao Shi
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California.
| | - Ai-Hong Ma
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California
| | - Lingru Xue
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California
| | - Meimei Li
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California
| | - Hao G Nguyen
- Department of Urology, University of California, San Francisco, California
| | - Joy C Yang
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California
| | - Clifford G Tepper
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California at Davis, Sacramento, California. UC Davis Comprehensive Cancer Center, University of California at Davis, Sacramento, California
| | - Regina Gandour-Edwards
- Department of Pathology, School of Medicine, University of California at Davis, Sacramento, California
| | - Christopher P Evans
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California. UC Davis Comprehensive Cancer Center, University of California at Davis, Sacramento, California
| | - Hsing-Jien Kung
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California at Davis, Sacramento, California. UC Davis Comprehensive Cancer Center, University of California at Davis, Sacramento, California
| | - Ralph W deVere White
- Department of Urology, School of Medicine, University of California at Davis, Sacramento, California. UC Davis Comprehensive Cancer Center, University of California at Davis, Sacramento, California.
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29
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Richter I, Fidler AE. Tunicate pregnane X receptor (PXR) orthologs: Transcript characterization and natural variation. Mar Genomics 2015; 23:99-108. [DOI: 10.1016/j.margen.2015.05.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/06/2015] [Accepted: 05/06/2015] [Indexed: 12/12/2022]
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30
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Engström W, Darbre P, Eriksson S, Gulliver L, Hultman T, Karamouzis MV, Klaunig JE, Mehta R, Moorwood K, Sanderson T, Sone H, Vadgama P, Wagemaker G, Ward A, Singh N, Al-Mulla F, Al-Temaimi R, Amedei A, Colacci AM, Vaccari M, Mondello C, Scovassi AI, Raju J, Hamid RA, Memeo L, Forte S, Roy R, Woodrick J, Salem HK, Ryan EP, Brown DG, Bisson WH. The potential for chemical mixtures from the environment to enable the cancer hallmark of sustained proliferative signalling. Carcinogenesis 2015; 36 Suppl 1:S38-60. [PMID: 26106143 DOI: 10.1093/carcin/bgv030] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The aim of this work is to review current knowledge relating the established cancer hallmark, sustained cell proliferation to the existence of chemicals present as low dose mixtures in the environment. Normal cell proliferation is under tight control, i.e. cells respond to a signal to proliferate, and although most cells continue to proliferate into adult life, the multiplication ceases once the stimulatory signal disappears or if the cells are exposed to growth inhibitory signals. Under such circumstances, normal cells remain quiescent until they are stimulated to resume further proliferation. In contrast, tumour cells are unable to halt proliferation, either when subjected to growth inhibitory signals or in the absence of growth stimulatory signals. Environmental chemicals with carcinogenic potential may cause sustained cell proliferation by interfering with some cell proliferation control mechanisms committing cells to an indefinite proliferative span.
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Affiliation(s)
- Wilhelm Engström
- Department of Biosciences and Veterinary Public Health, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, PO Box 7028, 75007 Uppsala, Sweden,
| | - Philippa Darbre
- School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6UB, UK
| | - Staffan Eriksson
- Department of Biochemistry, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Box 575, 75123 Uppsala, Sweden
| | - Linda Gulliver
- Faculty of Medicine, University of Otago, PO Box 913, Dunedin 9050, New Zealand
| | - Tove Hultman
- Department of Biosciences and Veterinary Public Health, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, PO Box 7028, 75007 Uppsala, Sweden, School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6UB, UK
| | - Michalis V Karamouzis
- Department of Biological Chemistry Medical School, Institute of Molecular Medicine and Biomedical Research, University of Athens, Marasli 3, Kolonaki, Athens 10676, Greece
| | - James E Klaunig
- Department of Environmental Health, School of Public Health, Indiana University Bloomington , 1025 E. 7th Street, Suite 111, Bloomington, IN 47405, USA
| | - Rekha Mehta
- Regulatory Toxicology Research Division, Bureau of Chemical Safety, Food Directorate, HPFB, Health Canada, 251 Sir F.G. Banting Driveway, AL # 2202C, Tunney's Pasture, Ottawa, Ontario K1A 0K9, Canada
| | - Kim Moorwood
- Department of Biochemistry and Biology, University of Bath , Claverton Down, Bath BA2 7AY, UK
| | - Thomas Sanderson
- INRS-Institut Armand-Frappier, 531 boulevard des Prairies, Laval, Quebec H7V 1B7, Canada
| | - Hideko Sone
- Environmental Exposure Research Section, Center for Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibraki 3058506, Japan
| | - Pankaj Vadgama
- IRC in Biomedical Materials, School of Engineering & Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Gerard Wagemaker
- Center for Stem Cell Research and Development, Hacettepe University, Ankara 06100, Turkey
| | - Andrew Ward
- Department of Biochemistry and Biology, University of Bath , Claverton Down, Bath BA2 7AY, UK
| | - Neetu Singh
- Centre for Advanced Research, King George's Medical University, Chowk, Lucknow, Uttar Pradesh 226003, India
| | - Fahd Al-Mulla
- Department of Pathology, Kuwait University, Safat 13110, Kuwait
| | | | - Amedeo Amedei
- Department of Experimental and Clinical Medicine, University of Firenze, Firenze 50134, Italy
| | - Anna Maria Colacci
- Center for Environmental Carcinogenesis and Risk Assessment, Environmental Protection and Health Prevention Agency, Bologna 40126, Italy
| | - Monica Vaccari
- Center for Environmental Carcinogenesis and Risk Assessment, Environmental Protection and Health Prevention Agency, Bologna 40126, Italy
| | - Chiara Mondello
- Institute of Molecular Genetics, National Research Council, Pavia 27100, Italy
| | - A Ivana Scovassi
- Institute of Molecular Genetics, National Research Council, Pavia 27100, Italy
| | - Jayadev Raju
- Regulatoty Toxicology Research Division, Bureau of Chemical Safety, Food Directorate, HPFB, Health Canada, Ottawa, Ontario K1A0K9, Canada
| | - Roslida A Hamid
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Lorenzo Memeo
- Mediterranean Institute of Oncology, Viagrande 95029, Italy
| | - Stefano Forte
- Mediterranean Institute of Oncology, Viagrande 95029, Italy
| | - Rabindra Roy
- Molecular Oncology Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jordan Woodrick
- Molecular Oncology Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Hosni K Salem
- Urology Dept. kasr Al-Ainy School of Medicine, Cairo University, El Manial, Cairo 12515, Egypt
| | - Elizabeth P Ryan
- Department of Environmental and Radiological Sciences, Colorado State University//Colorado School of Public Health, Fort Collins CO 80523-1680, USA and
| | - Dustin G Brown
- Department of Environmental and Radiological Sciences, Colorado State University//Colorado School of Public Health, Fort Collins CO 80523-1680, USA and
| | - William H Bisson
- Environmental and Molecular Toxicology, Environmental Health Sciences Center, Oregon State University, Corvallis, OR 97331, USA
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31
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Liang M, Adisetiyo H, Liu X, Liu R, Gill P, Roy-Burman P, Jones JO, Mulholland DJ. Identification of Androgen Receptor Splice Variants in the Pten Deficient Murine Prostate Cancer Model. PLoS One 2015. [PMID: 26196517 PMCID: PMC4510390 DOI: 10.1371/journal.pone.0131232] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Androgen receptor (AR) variants are associated with resistance to anti androgen therapy both in human prostate cancer cell lines and clinical samples. These observations support the hypothesis that AR isoform accumulation is a consequence of selective therapeutic pressure on the full length AR. The Pten deficient prostate cancer model proceeds with well-defined kinetics including progression to castration resistant prostate cancer (CRPC). While surgical castration and enzalutamide treatments yield an initial therapeutic response, Pten-/-epithelia continue to proliferate yielding locally invasive primary tumor pathology. That most epithelium remains AR positive, but ligand independent, suggests the presence of oncogenic AR variants. To address this hypothesis, we have used a panel of recently described Pten-/- tumor cell lines derived from both from hormone intact (E4, E8) and castrated Pten mutants (cE1, cE2) followed by RACE PCR to identify and characterize three novel truncated, amino terminus containing AR variants (mAR-Va, b, c). Variants appear not only conserved throughout progression but are correlated with nearly complete loss of full length AR (AR-FL) at castrate androgen levels. The overexpression of variants leads to enhanced transcriptional activity of AR while knock down studies show reduced transcriptional output. Collectively, the identification of truncated AR variants in the conditional PTEN deletion model supports a role for maintaining the CRPC phenotype and provides further therapeutic applications of this preclinical model.
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Affiliation(s)
- Mengmeng Liang
- Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
| | - Helty Adisetiyo
- Children’s Hospital of Los Angeles, Los Angeles, California, United States of America
| | - Xiuqing Liu
- St. Luke's Hospital, Internal medicine resident, Chesterfield, Missouri, United States of America
| | - Ren Liu
- Department of Medicine, University of Southern California Keck School of Medicine, Los Angeles, California, United States of America
| | - Parkash Gill
- Department of Medicine, University of Southern California Keck School of Medicine, Los Angeles, California, United States of America
| | - Pradip Roy-Burman
- Department of Biochemistry and Molecular Biology, University of Southern California, Los Angeles, California, United States of America
| | - Jeremy O. Jones
- Beckman Research Institute, City of Hope, Duarte, California, United States of America
- * E-mail: (DJM); (JJ)
| | - David J. Mulholland
- Icahn School of Medicine at Mount Sinai, New York, New York, United States of America
- * E-mail: (DJM); (JJ)
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Katsogiannou M, Ziouziou H, Karaki S, Andrieu C, Henry de Villeneuve M, Rocchi P. The hallmarks of castration-resistant prostate cancers. Cancer Treat Rev 2015; 41:588-97. [PMID: 25981454 DOI: 10.1016/j.ctrv.2015.05.003] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 04/30/2015] [Accepted: 05/04/2015] [Indexed: 12/17/2022]
Abstract
Prostate cancer has become a real public health issue in industrialized countries, mainly due to patients' relapse by castration-refractory disease after androgen ablation. Castration-resistant prostate cancer is an incurable and highly aggressive terminal stage of prostate cancer, seriously jeopardizing the patient's quality of life and lifespan. The management of castration-resistant prostate cancer is complex and has opened new fields of research during the last decade leading to an improved understanding of the biology of the disease and the development of new therapies. Most advanced tumors resistant to therapy still maintain the androgen receptor-pathway, which plays a central role for survival and growth of most castration-resistant prostate cancers. Many mechanisms induce the emergence of the castration resistant phenotype through this pathway. However some non-related AR pathways like neuroendocrine cells or overexpression of anti-apoptotic proteins like Hsp27 are described to be involved in CRPC progression. More recently, loss of expression of tumor suppressor gene, post-transcriptional modification using miRNA, epigenetic alterations, alternatif splicing and gene fusion became also hallmarks of castration-resistant prostate cancer. This review presents an up-to-date overview of the androgen receptor-related mechanisms as well as the latest evidence of the non-AR-related mechanisms underlying castration-resistant prostate cancer progression.
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Affiliation(s)
- Maria Katsogiannou
- Inserm, UMR1068, CRCM, Marseille F-13009, France; Institut Paoli-Calmettes, Marseille F-13009, France; Aix-Marseille Université, F-13284 Marseille, France; CNRS, UMR7258, CRCM, Marseille F-13009, France.
| | - Hajer Ziouziou
- Inserm, UMR1068, CRCM, Marseille F-13009, France; Institut Paoli-Calmettes, Marseille F-13009, France; Aix-Marseille Université, F-13284 Marseille, France; CNRS, UMR7258, CRCM, Marseille F-13009, France
| | - Sara Karaki
- Inserm, UMR1068, CRCM, Marseille F-13009, France; Institut Paoli-Calmettes, Marseille F-13009, France; Aix-Marseille Université, F-13284 Marseille, France; CNRS, UMR7258, CRCM, Marseille F-13009, France
| | - Claudia Andrieu
- Inserm, UMR1068, CRCM, Marseille F-13009, France; Institut Paoli-Calmettes, Marseille F-13009, France; Aix-Marseille Université, F-13284 Marseille, France; CNRS, UMR7258, CRCM, Marseille F-13009, France
| | - Marie Henry de Villeneuve
- Inserm, UMR1068, CRCM, Marseille F-13009, France; Institut Paoli-Calmettes, Marseille F-13009, France; Aix-Marseille Université, F-13284 Marseille, France; CNRS, UMR7258, CRCM, Marseille F-13009, France
| | - Palma Rocchi
- Inserm, UMR1068, CRCM, Marseille F-13009, France; Institut Paoli-Calmettes, Marseille F-13009, France; Aix-Marseille Université, F-13284 Marseille, France; CNRS, UMR7258, CRCM, Marseille F-13009, France.
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Abstract
Androgen receptor splice variants (AR-Vs)--which are expressed in castration-resistant prostate cancer (CRPC) cell lines and clinical samples--lack the C-terminal ligand-binding domain and are constitutively active. AR-Vs are, therefore, resistant to traditional androgen deprivation therapy (ADT). AR-Vs are induced by several mechanisms, including ADT, and might contribute to the progression of CRPC and resistance to ADT. AR-Vs could represent a novel therapeutic target for prostate cancer, especially in CRPC.
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34
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Martin SK, Banuelos CA, Sadar MD, Kyprianou N. N-terminal targeting of androgen receptor variant enhances response of castration resistant prostate cancer to taxane chemotherapy. Mol Oncol 2014; 9:S1574-7891(14)00263-4. [PMID: 25432105 PMCID: PMC4433435 DOI: 10.1016/j.molonc.2014.10.014] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 10/03/2014] [Accepted: 10/29/2014] [Indexed: 01/23/2023] Open
Abstract
Taxane-based chemotherapy is an effective treatment for castration-resistant-prostate cancer (CRPC) via stabilization of microtubules. Previous studies identified that the inhibitory effect of microtubule-targeting chemotherapy on androgen receptor (AR) activity was conferred by interfering with AR intracellular trafficking. The N-terminal domain (NTD) of AR was identified as a tubulin-interacting domain that can be effectively targeted by the novel small molecule inhibitor, EPI. Taken together this evidence provided the rationale that targeting AR nuclear translocation and activity via a combination of an antagonist of the AR NTD and taxane-based chemotherapy may enhance the therapeutic response in CRPC. The present study investigated the anti-tumor efficacy of a combination of EPI with Docetaxel chemotherapy, in cell models of CRPC, harboring the AR splice variants in addition to the full length AR. Our findings demonstrate that there was no significant effect on the androgen-mediated nuclear transport of AR variants and AR transcriptional activity by Docetaxel. The therapeutic response to Docetaxel was enhanced by inhibition of the NTD of AR (by EPI) through cycling of epithelial-mesenchymal-transition (EMT) to mesenchymal-epithelial-transition (MET) among prostate cancer epithelial cells. These results support that transient "programming" of EMT by the AR NTD inhibitor, potentially drives the sensitivity of prostate tumors with differential distribution of AR variants to microtubule-targeting chemotherapy. This study is of major significance in dissecting mechanisms to overcome taxane resistance in advanced CRPC.
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Affiliation(s)
- Sarah K Martin
- Department of Molecular and Cellular Biochemistry, University of Kentucky College of Medicine, Lexington, KY, USA
| | - Carmen A Banuelos
- Department of Genome Sciences Centre, BC Cancer Agency, Vancouver, BC, Canada
| | - Marianne D Sadar
- Department of Genome Sciences Centre, BC Cancer Agency, Vancouver, BC, Canada
| | - Natasha Kyprianou
- Department of Molecular and Cellular Biochemistry, University of Kentucky College of Medicine, Lexington, KY, USA; Department of Urology, University of Kentucky, Lexington, USA; Markey Cancer Center, University of Kentucky, Lexington, KY, USA.
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35
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Lu J, Lonergan PE, Nacusi LP, Wang L, Schmidt LJ, Sun Z, Van der Steen T, Boorjian SA, Kosari F, Vasmatzis G, Klee GG, Balk SP, Huang H, Wang C, Tindall DJ. The cistrome and gene signature of androgen receptor splice variants in castration resistant prostate cancer cells. J Urol 2014; 193:690-8. [PMID: 25132238 DOI: 10.1016/j.juro.2014.08.043] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/07/2014] [Indexed: 01/23/2023]
Abstract
PURPOSE Spliced variant forms of androgen receptor were recently identified in castration resistant prostate cancer cell lines and clinical samples. We identified the cistrome and gene signature of androgen receptor splice variants in castration resistant prostate cancer cell lines and determined the clinical significance of androgen receptor splice variant regulated genes. MATERIALS AND METHODS The castration resistant prostate cancer cell line 22Rv1, which expresses full-length androgen receptor and androgen receptor splice variants endogenously, was used as the research model. We established 22Rv1-ARFL(-)/ARV(+) and 22Rv1-ARFL(-)/ARV(-) through RNA interference. Chromatin immunoprecipitation coupled with next generation sequencing and microarray techniques were used to identify the cistrome and gene expression profiles of androgen receptor splice variants in the absence of androgen. RESULTS Androgen receptor splice variant binding sites were identified in 22Rv1-ARFL(-)/ARV(+). A gene set was regulated uniquely by androgen receptor splice variants but not by full-length androgen receptor in the absence of androgen. Integrated analysis revealed that some genes were directly modulated by androgen receptor splice variants. Unsupervised clustering analysis showed that the androgen receptor splice variant gene signature differentiated benign from malignant prostate tissue as well as localized prostate cancer from metastatic castration resistant prostate cancer specimens. Some genes that were modulated uniquely by androgen receptor splice variants also correlated with histological grade and biochemical failure. CONCLUSIONS Androgen receptor splice variants can bind to DNA independent of full-length androgen receptor in the absence of androgen and modulate a unique set of genes that is not regulated by full-length androgen receptor. The androgen receptor splice variant gene signature correlates with disease progression. It distinguishes primary cancer from castration resistant prostate cancer specimens and benign from malignant prostate specimens.
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Affiliation(s)
- Ji Lu
- Department of Urology, First Hospital of Jilin University, Changchun, People's Republic of China; Department of Urology, Mayo Clinic, Rochester, Minnesota
| | | | - Lucas P Nacusi
- Department of Urology, Mayo Clinic, Rochester, Minnesota
| | - Liguo Wang
- Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota
| | - Lucy J Schmidt
- Department of Urology, Mayo Clinic, Rochester, Minnesota
| | - Zhifu Sun
- Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota
| | | | | | - Farhad Kosari
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - George Vasmatzis
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - George G Klee
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Steven P Balk
- Hematology-Oncology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Haojie Huang
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - Chunxi Wang
- Department of Urology, First Hospital of Jilin University, Changchun, People's Republic of China.
| | - Donald J Tindall
- Department of Urology, Mayo Clinic, Rochester, Minnesota; Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota.
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36
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Sprenger CCT, Plymate SR. The link between androgen receptor splice variants and castration-resistant prostate cancer. Discov Oncol 2014; 5:207-17. [PMID: 24798453 DOI: 10.1007/s12672-014-0177-y] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Accepted: 04/03/2014] [Indexed: 01/19/2023] Open
Abstract
Resistance to the latest advanced prostate cancer therapies, including abiraterone and enzalutamide, is associated with increased expression of constitutively active androgen receptor splice variants (AR-Vs). The exact mechanism by which these therapies result in AR-Vs is unknown, but may include genomic rearrangement of the androgen receptor gene as well as alternative splicing of the AR pre-messenger RNA (mRNA). An additional complication that hinders further development of effective AR strategies is that the mechanisms by which the directed therapies are bypassed may vary. Finally, the question must be addressed as to whether the androgen receptor remains to be the driver of most castration resistant disease or whether truly AR-independent tumors arise after successful androgen ablation therapy. In this review, we will examine androgen receptor splice variants as an alternative mechanism by which prostate cancer becomes resistant to androgen receptor-directed therapy.
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37
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AR variant ARv567es induces carcinogenesis in a novel transgenic mouse model of prostate cancer. Neoplasia 2014; 15:1009-17. [PMID: 24027426 DOI: 10.1593/neo.13784] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 06/17/2013] [Accepted: 06/24/2013] [Indexed: 02/02/2023] Open
Abstract
Androgen deprivation therapy remains the primary treatment modality for patients with metastatic prostate cancer but is uniformly marked by progression to castration-resistant prostate cancer (CRPC) after a period of regression. Continued activation of androgen receptor (AR) signaling is attributed as one of the most important mechanisms underlying failure of therapy. Recently, the discovery of constitutively active AR splice variants (AR-Vs) adds more credence to this idea. Expression of AR-Vs in metastases portends a rapid progression of the tumor. However, the precise role of the AR-Vs in CRPC still remains unknown. ARv567es is one of the two AR variants frequently found in human CRPC xenografts and metastases. Herein, we developed a probasin (Pb) promoter-driven ARv567es transgenic mouse, Pb-ARv567es, to evaluate the role of ARv567es in both autonomous prostate growth and progression to CRPC. We found that expression of ARv567es in the prostate results in epithelial hyperplasia by 16 weeks and invasive adenocarcinoma is evident by 1 year of age. The underlying genetic cellular events involved a cell cycle-related transcriptome and differential expression of a spectrum of genes that are critical for tumor initiation and progression. These findings indicate that ARv567es could induce tumorigenesis de novo and signifies the critical role of AR-Vs in CRPC. Thus, the Pb-ARv567es mouse could provide a novel model in which the role of AR variants in prostate cancer progression can be examined.
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38
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Brand LJ, Dehm SM. Androgen receptor gene rearrangements: new perspectives on prostate cancer progression. Curr Drug Targets 2014; 14:441-9. [PMID: 23410127 DOI: 10.2174/1389450111314040005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 11/14/2012] [Accepted: 02/06/2013] [Indexed: 11/22/2022]
Abstract
The androgen receptor (AR) is a master regulator transcription factor in normal and cancerous prostate cells. Canonical AR activation requires binding of androgen ligand to the AR ligand binding domain, translocation to the nucleus, and transcriptional activation of AR target genes. This regulatory axis is targeted for systemic therapy of advanced prostate cancer. However, a new paradigm for AR activation in castration-resistant prostate cancer (CRPC) has emerged wherein alternative splicing of AR mRNA promotes synthesis of constitutively active AR variants that lack the AR ligand binding domain (LBD). Recent work has indicated that structural alteration of the AR gene locus represents a key mechanism by which alterations in AR mRNA splicing arise. In this review, we examine the role of truncated AR variants (ARVs) and their corresponding genomic origins in models of prostate cancer progression, as well as the challenges they pose to the current standard of prostate cancer therapies targeting the AR ligand binding domain. Since ARVs lack the COOH-terminal LBD, the genesis of these AR gene rearrangements and their resulting ARVs provides strong rationale for the pursuit of new avenues of therapeutic intervention targeted at the AR NH2-terminal domain. We further suggest that genomic events leading to ARV expression could act as novel biomarkers of disease progression that may guide the optimal use of current and next-generation AR-targeted therapy.
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Affiliation(s)
- Lucas J Brand
- Graduate Program in Microbiology, Immunology, and Cancer Biology, University of Minnesota, Minneapolis, MN 55455, USA
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39
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Chen J, Weiss WA. Alternative splicing in cancer: implications for biology and therapy. Oncogene 2014; 34:1-14. [PMID: 24441040 DOI: 10.1038/onc.2013.570] [Citation(s) in RCA: 194] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 11/26/2013] [Accepted: 11/26/2013] [Indexed: 12/11/2022]
Abstract
Alternative splicing has critical roles in normal development and can promote growth and survival in cancer. Aberrant splicing, the production of noncanonical and cancer-specific mRNA transcripts, can lead to loss-of-function in tumor suppressors or activation of oncogenes and cancer pathways. Emerging data suggest that aberrant splicing products and loss of canonically spliced variants correlate with stage and progression in malignancy. Here, we review the splicing landscape of TP53, BARD1 and AR to illuminate roles for alternative splicing in cancer. We also examine the intersection between alternative splicing pathways and novel therapeutic approaches.
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Affiliation(s)
- J Chen
- 1] Biomedical Sciences Graduate Program, University of California, San Francisco, CA, USA [2] Department of Neurology, University of California, San Francisco, CA, USA
| | - W A Weiss
- 1] Department of Neurology, University of California, San Francisco, CA, USA [2] Department of Neurological Surgery and Pediatrics, University of California, San Francisco, CA, USA
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40
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Androgens and the androgen receptor (AR). Mol Oncol 2013. [DOI: 10.1017/cbo9781139046947.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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41
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Culig Z, Santer FR. Molecular aspects of androgenic signaling and possible targets for therapeutic intervention in prostate cancer. Steroids 2013; 78:851-9. [PMID: 23643785 DOI: 10.1016/j.steroids.2013.04.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 04/05/2013] [Accepted: 04/16/2013] [Indexed: 01/18/2023]
Abstract
The androgen axis is of crucial importance in the development of novel therapeutic approaches for non-organ-confined prostate cancer. Recent studies revealed that tumor cells have the ability to synthesize androgenic hormones in an intracrine manner. This recognition opened the way for the development of a novel drug, abiraterone acetate, which shows benefits in clinical trials. A novel anti-androgen enzalutamide that inhibits androgen receptor (AR) nuclear translocation has also been developed and tested in the clinic. AR coactivators exert specific cellular regulatory functions, however it is difficult to improve the treatment because of a large number of coregulators overexpressed in prostate cancer. AR itself is a target of several miRNAs which may cause its increased degradation, inhibition of proliferation, and increased apoptosis. Truncated AR occur in prostate cancer as a consequence of alternative splicing. They exhibit ligand-independent transcriptional activity. Although there has been an improvement of endocrine therapy in prostate cancer, increased intracrine ligand synthesis and appearance of variant receptors may facilitate the development of resistance.
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Affiliation(s)
- Zoran Culig
- Division of Experimental Urology, Department of Urology, Innsbruck Medical University, Anichstrasse 35, A-6020 Innsbruck, Austria.
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42
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Gowda PS, Deng JD, Mishra S, Bandyopadhyay A, Liang S, Lin S, Mahalingam D, Sun LZ. Inhibition of hedgehog and androgen receptor signaling pathways produced synergistic suppression of castration-resistant prostate cancer progression. Mol Cancer Res 2013; 11:1448-61. [PMID: 23989930 DOI: 10.1158/1541-7786.mcr-13-0278] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UNLABELLED Metastatic prostate cancer is initially treated with androgen ablation therapy, which causes regression of androgen-dependent tumors. However, these tumors eventually relapse resulting in recurrent castration-resistant prostate cancer (CRPC). Currently, there is no effective therapy for CRPC and the molecular mechanisms that lead to the development of CRPC are not well understood. Here, we evaluated the hypothesis that combined inhibition of Hedgehog (Hh) and androgen receptor (AR) signaling will synergistically attenuate the growth of CRPC in vitro and in vivo. Androgen deprivation induced full-length androgen receptor protein levels in CRPC cells, but decreased its nuclear localization and transcriptional activity. However, androgen deprivation also increased a truncated form of androgen receptor (lacking ligand-binding domain) that possessed transcriptional activity in CRPC cells. Androgen deprivation also promoted the expression of Hh signaling components in CRPC cells, xenograft tumors, and the prostate glands of castrated mice. Importantly, although inhibition of either Hh or androgen receptor signaling alone was only moderately effective in blocking CRPC cell growth, combination of an Hh pathway inhibitor and a noncompetitive androgen receptor inhibitor synergistically suppressed the growth of CRPC cells in vitro and in vivo. Finally, noncompetitive inhibition of androgen receptor, but not competitive inhibition, was effective at limiting the activity of truncated androgen receptor leading to the inhibition of CRPC. IMPLICATIONS Combined therapy using Hh inhibitors and a non-competitive AR inhibitor may limit CRPC growth.
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Affiliation(s)
- Pramod S Gowda
- Department of Cellular & Structural Biology, University of Texas Health Science Center, 7703 Floyd Curl Drive, Mail Code 7762, San Antonio, TX 78229-3900.
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43
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Experimental evidence of persistent androgen-receptor-dependency in castration-resistant prostate cancer. Int J Mol Sci 2013; 14:15615-35. [PMID: 23896594 PMCID: PMC3759876 DOI: 10.3390/ijms140815615] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 07/14/2013] [Accepted: 07/15/2013] [Indexed: 01/08/2023] Open
Abstract
In the majority of castration-resistant prostate cancer (CRPC), prostate-specific antigen (PSA), product of a gene that is almost exclusively regulated by the androgen receptor (AR), still acts as a serum marker reflecting disease burden, indicating that AR signaling is activated even under castrate level of serum androgen. Accumulated evidence shows that transcriptional ability of AR is activated both in ligand-dependent and -independent manners in CRPC cells. Some androgen-independent sublines derived from originally androgen-dependent LNCaP prostate cancer cells overexpress the AR and PSA, for which silencing the AR gene suppresses cellular proliferation. The overexpression of the AR confers androgen-independent growth ability on androgen-dependent prostate cancer cells. Some patient-derived prostate cancer xenograft lines also acquire castration-resistant growth ability secreting PSA. More recent publications have shown that the AR activated in CRPC cells regulates distinct gene sets from that in androgen-dependent status. This concept provides very important insights in the development of novel anti-prostate cancer drugs such as new generation anti-androgens and CYP17 inhibitors.
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44
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On the origins of the androgen receptor low molecular weight species. Discov Oncol 2013; 4:259-69. [PMID: 23860689 DOI: 10.1007/s12672-013-0152-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 06/12/2013] [Indexed: 12/11/2022] Open
Abstract
Prostate cancer (CaP), a commonly diagnosed malignancy, is readily treated by androgen ablation. This treatment temporarily halts the disease, but castration-resistant neoplasms that are refractory to current therapies emerge. While these neoplasms are no longer dependent on physiological levels of androgens, they remain reliant on the expression of the androgen receptor (AR). There are multiple mechanisms by which CaP cells circumvent androgen ablation therapies. These include AR mutations that broaden ligand specificity, AR overexpression, AR activation by growth factors and cytokines, overexpression of AR co-activators, altered steroid metabolism, and a locus-wide histone transcriptional activation of some AR targets. This review focuses on a more recently described mechanism: the expression of low molecular weight AR species that are missing the ligand-binding domain and function independently of ligand to drive proliferation. The etiology, biological activity, unique features, predictive value, and therapeutic implication of these androgen receptor isoforms are discussed in depth.
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45
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Cottard F, Asmane I, Erdmann E, Bergerat JP, Kurtz JE, Céraline J. Constitutively active androgen receptor variants upregulate expression of mesenchymal markers in prostate cancer cells. PLoS One 2013; 8:e63466. [PMID: 23658830 PMCID: PMC3642121 DOI: 10.1371/journal.pone.0063466] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Accepted: 04/02/2013] [Indexed: 12/02/2022] Open
Abstract
Androgen receptor (AR) signaling pathway remains the foremost target of novel therapeutics for castration-resistant prostate cancer (CRPC). However, the expression of constitutively active AR variants lacking the carboxy-terminal region in CRPC may lead to therapy inefficacy. These AR variants are supposed to support PCa cell growth in an androgen-depleted environment, but their mode of action still remains unresolved. Moreover, recent studies indicate that constitutively active AR variants are expressed in primary prostate tumors and may contribute to tumor progression. The aim of this study was to investigate the impact of constitutively active AR variants on the expression of tumor progression markers. N-cadherin expression was analyzed in LNCaP cells overexpressing the wild type AR or a constitutively active AR variant by qRT-PCR, Western blot and immunofluorescence. We showed here for the first time that N-cadherin expression was increased in the presence of constitutively active AR variants. These results were confirmed in C4-2B cells overexpressing these AR variants. Although N-cadherin expression is often associated with a downregulation of E-cadherin, this phenomenon was not observed in our model. Nevertheless, in addition to the increased expression of N-cadherin, an upregulation of other mesenchymal markers expression such as VIMENTIN, SNAIL and ZEB1 was observed in the presence of constitutively active variants. In conclusion, our findings highlight novel consequences of constitutively active AR variants on the regulation of mesenchymal markers in prostate cancer.
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Affiliation(s)
- Félicie Cottard
- INSERM U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Irène Asmane
- INSERM U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
- CHRU Strasbourg, Hematology and Oncology Unit, Strasbourg, France
| | - Eva Erdmann
- INSERM U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Jean-Pierre Bergerat
- INSERM U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
- CHRU Strasbourg, Hematology and Oncology Unit, Strasbourg, France
| | - Jean-Emmanuel Kurtz
- INSERM U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
- CHRU Strasbourg, Hematology and Oncology Unit, Strasbourg, France
| | - Jocelyn Céraline
- INSERM U1113, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
- CHRU Strasbourg, Hematology and Oncology Unit, Strasbourg, France
- * E-mail:
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46
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Sampson N, Neuwirt H, Puhr M, Klocker H, Eder IE. In vitro model systems to study androgen receptor signaling in prostate cancer. Endocr Relat Cancer 2013; 20:R49-64. [PMID: 23447570 DOI: 10.1530/erc-12-0401] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Prostate cancer (PCa) is one of the most common causes of male cancer-related death in Western nations. The cellular response to androgens is mediated via the androgen receptor (AR), a ligand-inducible transcription factor whose dysregulation plays a key role during PCa development and progression following androgen deprivation therapy, the current mainstay systemic treatment for advanced PCa. Thus, a better understanding of AR signaling and new strategies to abrogate AR activity are essential for improved therapeutic intervention. Consequently, a large number of experimental cell culture models have been established to facilitate in vitro investigations into the role of AR signaling in PCa development and progression. These different model systems mimic distinct stages of this heterogeneous disease and exhibit differences with respect to AR expression/status and androgen responsiveness. Technological advances have facilitated the development of in vitro systems that more closely reflect the physiological setting, for example via the use of three-dimensional coculture to study the interaction of prostate epithelial cells with the stroma, endothelium, immune system and tissue matrix environment. This review provides an overview of the most commonly used in vitro cell models currently available to study AR signaling with particular focus on their use in addressing key questions relating to the development and progression of PCa. It is hoped that the continued development of in vitro models will provide more biologically relevant platforms for mechanistic studies, drug discovery and design ensuring a more rapid transfer of knowledge from the laboratory to the clinic.
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Affiliation(s)
- Natalie Sampson
- Division of Experimental Urology, Department of Urology, Innsbruck Medical University, Anichstraße 35, A-6020 Innsbruck, Austria
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Fiandalo MV, Wu W, Mohler JL. The role of intracrine androgen metabolism, androgen receptor and apoptosis in the survival and recurrence of prostate cancer during androgen deprivation therapy. Curr Drug Targets 2013; 14:420-40. [PMID: 23565755 PMCID: PMC3991464 DOI: 10.2174/1389450111314040004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 02/21/2013] [Accepted: 02/22/2013] [Indexed: 11/22/2022]
Abstract
Prostate cancer (CaP) is the most frequently diagnosed cancer and leading cause of cancer death in American men. Almost all men present with advanced CaP and some men who fail potentially curative therapy are treated with androgen deprivation therapy (ADT). ADT is not curative and CaP recurs as the lethal phenotype. The goal of this review is to apply our current understanding of CaP and castration-recurrent CaP (CR-CaP) to earlier studies that characterized ADT and the molecular mechanisms that facilitate the transition from androgen-stimulated CaP to CR-CaP. Reexamination of earlier studies also may provide a better understanding of how more newly recognized mechanisms, such as intracrine metabolism, may be involved with the early events that allow CaP survival after initiation of ADT and subsequent development of CR-CaP.
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Affiliation(s)
- Michael V. Fiandalo
- Department of Urology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Wenjie Wu
- Department of Urology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - James L. Mohler
- Department of Urology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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Ben Jemaa A, Sallami S, Céraline J, Oueslati R. A novel regulation of PSMA and PSA expression by Q640X AR in 22Rv1 and LNCaP prostate cancer cells. Cell Biol Int 2013; 37:464-70. [PMID: 23418075 DOI: 10.1002/cbin.10055] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 01/22/2013] [Indexed: 01/31/2023]
Abstract
We have investigated the expression of prostate-specific membrane antigen (PSMA) and prostate-specific antigen (PSA) transcripts in androgen-dependent (LNCaP) and androgen-independent (22Rv1) prostate cancer cell lines. We also enquired whether Q640X CTE-truncated androgen receptor (AR) has an impact on transcription of mRNA for PSMA and PSA in transfected androgen-sensitive prostate cancer LNCaP cells. Wild type LNCaP, 22Rv1 prostate cancer cells, prostate stromal cells (PrSC) and LNCaP cells transfected with p-Q640X AR, p-WT AR or p-C3 empty plasmids were studied. The expression of PSMA and PSA were detected by real-time PCR after transfection for 4 and 7 days. Expression of mRNAs for PSA was sixfold greater than PSMA in wild type LNCaP cells. In contrast, the wild type androgen refractory 22Rv1 cell line reacted almost exactly the opposite way reverse to LNCaP cells, since the transcription of mRNA for PSMA almost twofold greater than PSA. Non-transfected human PrSC responded similarly to PSMA mRNA and PSA mRNA was not detected in these cells. Q640X AR transfected LNCaP cells downregulated the expression of PSMA and PSA genes after 7 days. Our results demonstrate that Q640X mutated AR may have an important regulatory role in mediating the PSMA and PSA genes expression during the progression of prostate cancer from androgen-dependence to androgen-independence. Understanding their functional properties and mechanisms by which ARs involved in regulation of PSMA and PSA expression will allow the identification of new target therapies for the treatment of hormone-resistant prostate cancer.
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Affiliation(s)
- Awatef Ben Jemaa
- Unit of Immunology and Microbiology Environmental and Carcinogenesis, Faculty of Sciences of Bizerte, University of Carthage, 7021 Zarzouna, Tunisia
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Lonergan PE, Tindall DJ. Truncated Androgen Receptor Splice Variants in Prostate Cancer. Prostate Cancer 2013. [DOI: 10.1007/978-1-4614-6828-8_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Guyader C, Céraline J, Gravier E, Morin A, Michel S, Erdmann E, de Pinieux G, Cabon F, Bergerat JP, Poupon MF, Oudard S. Risk of hormone escape in a human prostate cancer model depends on therapy modalities and can be reduced by tyrosine kinase inhibitors. PLoS One 2012; 7:e42252. [PMID: 22879924 PMCID: PMC3412862 DOI: 10.1371/journal.pone.0042252] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Accepted: 07/05/2012] [Indexed: 11/29/2022] Open
Abstract
Almost all prostate cancers respond to androgen deprivation treatment but many recur. We postulated that risk of hormone escape -frequency and delay- are influenced by hormone therapy modalities. More, hormone therapies induce crucial biological changes involving androgen receptors; some might be targets for escape prevention. We investigated the relationship between the androgen deprivation treatment and the risk of recurrence using nude mice bearing the high grade, hormone-dependent human prostate cancer xenograft PAC120. Tumor-bearing mice were treated by Luteinizing-Hormone Releasing Hormone (LHRH) antagonist alone, continuous or intermittent regimen, or combined with androgen receptor (AR) antagonists (bicalutamide or flutamide). Tumor growth was monitored. Biological changes were studied as for genomic alterations, AR mutations and protein expression in a large series of recurrent tumors according to hormone therapy modalities. Therapies targeting Her-2 or AKT were tested in combination with castration. All statistical tests were two-sided. Tumor growth was inhibited by continuous administration of the LH-RH antagonist degarelix (castration), but 40% of tumors recurred. Intermittent castration or complete blockade induced by degarelix and antiandrogens combination, inhibited tumor growth but increased the risk of recurrence (RR) as compared to continuous castration (RRintermittent: 14.5, RRcomplete blockade: 6.5 and 1.35). All recurrent tumors displayed new quantitative genetic alterations and AR mutations, whatever the treatment modalities. AR amplification was found after complete blockade. Increased expression of Her-2/neu with frequent ERK/AKT activation was detected in all variants. Combination of castration with a Her-2/neu inhibitor decreased recurrence risk (0.17) and combination with an mTOR inhibitor prevented it. Anti-hormone treatments influence risk of recurrence although tumor growth inhibition was initially similar. Recurrent tumors displayed genetic instability, AR mutations, and alterations of phosphorylation pathways. We postulated that Her-2/AKT pathways allowed salvage of tumor cells under castration and we demonstrated that their inhibition prevented tumor recurrence in our model.
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Affiliation(s)
| | - Jocelyn Céraline
- Signaling and Prostate Cancer Group, Université de Strasbourg, Strasbourg, France
| | - Eléonore Gravier
- Translational Research Department, Institut Curie, Paris, France
- Biostatistics Department, Institut Curie, Paris, France
- U900, INSERM, Paris, France
- Ecole des Mines de Paris, ParisTech, Fontainebleau, France
| | | | - Sandrine Michel
- Biomarker Research and Validation Department, BioMérieux, Marcy l’Etoile, France
| | - Eva Erdmann
- Signaling and Prostate Cancer Group, Université de Strasbourg, Strasbourg, France
| | | | | | - Jean-Pierre Bergerat
- Signaling and Prostate Cancer Group, Université de Strasbourg, Strasbourg, France
| | | | - Stéphane Oudard
- Medical Oncology, Hôpital Européen Georges Pompidou, Paris, France
- Université Paris V René Descartes, Paris, France
- * E-mail:
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