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Yang Y, Lv G, Xiu R, Yang H, Wang W, Yu P, Zhang J, Ye L, Wang H, Tian J. Novel selective agents for the degradation of AR/AR-V7 to treat advanced prostate cancer. Eur J Med Chem 2024; 271:116400. [PMID: 38626524 DOI: 10.1016/j.ejmech.2024.116400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 03/25/2024] [Accepted: 04/06/2024] [Indexed: 04/18/2024]
Abstract
The androgen receptor AR antagonists, such as enzalutamide and apalutamide, are efficient therapeutics for the treatment of prostate cancer (PCa). Even though they are effective at first, resistance to both drugs occurs frequently. Resistance is mainly driven by aberrations of the AR signaling pathway including AR gene amplification and the expression of AR splice variants (e.g. AR-V7). This highlights the urgent need for alternative therapeutic strategies. Here, a total of 24 compounds were synthesized and biologically evaluated to disclose compound 20i, exhibiting potent AR antagonistic activities (IC50 = 172.85 ± 21.33 nM), promising AR/AR-V7 protein degradation potency, and dual targeting site of probably AR (ligand-binding domain, LBD and N-terminal domain, NTD). It potently inhibits cell growth with IC50 values of 4.87 ± 0.52 and 2.07 ± 0.34 μM in the LNCaP and 22RV1 cell lines, respectively, and exhibited effective tumor growth inhibition (TGI = 50.9 %) in the 22RV1 xenograft study. These data suggest that 20i has the potential for development as an AR/AR-V7 inhibitor with degradation ability to treat advanced prostate cancer.
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Affiliation(s)
- Yifei Yang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, 264005, China; State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China
| | - Guangyao Lv
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, 264005, China; Binzhou Medical University Hospital, Binzhou, Shandong, 256603, China
| | - Ruijuan Xiu
- State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China
| | - Huijie Yang
- State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China
| | - Wenyan Wang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, 264005, China; State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China
| | - Pengfei Yu
- State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China; Department of Clinical Medicine, Binzhou Medical University, Yantai, 256603, China
| | - Jianzhao Zhang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, 264005, China; State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China
| | - Liang Ye
- State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China; School of Public Health and Management, Binzhou Medical University, Yantai, China.
| | - Hongbo Wang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, 264005, China; State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China.
| | - Jingwei Tian
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, 264005, China; State Key Laboratory of Advanced Drug Delivery and Release Systems, Shandong Luye Pharmaceutical Co., Ltd., Yantai, Shandong 264003, PR China.
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2
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Piombino C, Pipitone S, Tonni E, Mastrodomenico L, Oltrecolli M, Tchawa C, Matranga R, Roccabruna S, D’Agostino E, Pirola M, Bacchelli F, Baldessari C, Baschieri MC, Dominici M, Sabbatini R, Vitale MG. Homologous Recombination Repair Deficiency in Metastatic Prostate Cancer: New Therapeutic Opportunities. Int J Mol Sci 2024; 25:4624. [PMID: 38731844 PMCID: PMC11083429 DOI: 10.3390/ijms25094624] [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: 03/25/2024] [Revised: 04/14/2024] [Accepted: 04/22/2024] [Indexed: 05/13/2024] Open
Abstract
More than 20% of metastatic prostate cancer carries genomic defects involving DNA damage repair pathways, mainly in homologous recombination repair-related genes. The recent approval of olaparib has paved the way to precision medicine for the treatment of metastatic prostate cancer with PARP inhibitors in this subset of patients, especially in the case of BRCA1 or BRCA2 pathogenic/likely pathogenic variants. In face of this new therapeutic opportunity, many issues remain unsolved. This narrative review aims to describe the relationship between homologous recombination repair deficiency and prostate cancer, the techniques used to determine homologous recombination repair status in prostate cancer, the crosstalk between homologous recombination repair and the androgen receptor pathway, the current evidence on PARP inhibitors activity in metastatic prostate cancer also in homologous recombination repair-proficient tumors, as well as emerging mechanisms of resistance to PARP inhibitors. The possibility of combination therapies including a PARP inhibitor is an attractive option, and more robust data are awaited from ongoing phase II and phase III trials outlined in this manuscript.
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Affiliation(s)
- Claudia Piombino
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Stefania Pipitone
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Elena Tonni
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Luciana Mastrodomenico
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Marco Oltrecolli
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Cyrielle Tchawa
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Rossana Matranga
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Sara Roccabruna
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Elisa D’Agostino
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Marta Pirola
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Francesca Bacchelli
- Clinical Trials Office, Division of Oncology, Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, 41124 Modena, Italy;
| | - Cinzia Baldessari
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Maria Cristina Baschieri
- Laboratory of Cellular Therapy, Division of Oncology, Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, 41124 Modena, Italy;
| | - Massimo Dominici
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
- Laboratory of Cellular Therapy, Division of Oncology, Department of Medical and Surgical Sciences for Children & Adults, University of Modena and Reggio Emilia, 41124 Modena, Italy;
| | - Roberto Sabbatini
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
| | - Maria Giuseppa Vitale
- Division of Oncology, Department of Oncology and Hematology, University Hospital of Modena, 41124 Modena, Italy; (C.P.); (S.P.); (E.T.); (L.M.); (M.O.); (C.T.); (R.M.); (S.R.); (E.D.); (M.P.); (C.B.); (M.D.); (R.S.)
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Stracker TH, Osagie OI, Escorcia FE, Citrin DE. Exploiting the DNA Damage Response for Prostate Cancer Therapy. Cancers (Basel) 2023; 16:83. [PMID: 38201511 PMCID: PMC10777950 DOI: 10.3390/cancers16010083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/14/2023] [Accepted: 12/20/2023] [Indexed: 01/12/2024] Open
Abstract
Prostate cancers that progress despite androgen deprivation develop into castration-resistant prostate cancer, a fatal disease with few treatment options. In this review, we discuss the current understanding of prostate cancer subtypes and alterations in the DNA damage response (DDR) that can predispose to the development of prostate cancer and affect its progression. We identify barriers to conventional treatments, such as radiotherapy, and discuss the development of new therapies, many of which target the DDR or take advantage of recurring genetic alterations in the DDR. We place this in the context of advances in understanding the genetic variation and immune landscape of CRPC that could help guide their use in future treatment strategies. Finally, we discuss several new and emerging agents that may advance the treatment of lethal disease, highlighting selected clinical trials.
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Affiliation(s)
- Travis H. Stracker
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (O.I.O.); (F.E.E.); (D.E.C.)
| | - Oloruntoba I. Osagie
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (O.I.O.); (F.E.E.); (D.E.C.)
| | - Freddy E. Escorcia
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (O.I.O.); (F.E.E.); (D.E.C.)
- Molecular Imaging Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Deborah E. Citrin
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (O.I.O.); (F.E.E.); (D.E.C.)
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Van-Duyne G, Blair IA, Sprenger C, Moiseenkova-Bell V, Plymate S, Penning TM. The androgen receptor. VITAMINS AND HORMONES 2023; 123:439-481. [PMID: 37717994 DOI: 10.1016/bs.vh.2023.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
The Androgen Receptor (AR) is a ligand (androgen) activated transcription factor and a member of the nuclear receptor (NR) superfamily. It is required for male sex hormone function. AR-FL (full-length) has the domain structure of NRs, an N-terminal domain (NTD) required for transactivation, a DNA-binding domain (DBD), a nuclear localization signal (NLS) and a ligand-binding domain (LBD). Paradoxes exist in that endogenous ligands testosterone (T) and 5α-dihydrotestosterone (DHT) have differential effects on male sexual development while binding to the same receptor and transcriptional specificity is achieved even though the androgen response elements (AREs) are identical to those seen for the progesterone, glucocorticoid and mineralocorticoid receptors. A high resolution 3-dimensional structure of AR-FL by either cryo-EM or X-ray crystallography has remained elusive largely due to the intrinsic disorder of the NTD. AR function is regulated by post-translational modification leading to a large number of proteoforms. The interaction of these proteoforms in multiprotein complexes with co-activators and co-repressors driven by interdomain coupling mediates the AR transcriptional output. The AR is a drug target for selective androgen receptor modulators (SARMS) that either have anabolic or androgenic effects. Protstate cancer is treated with androgen deprivation therapy or by the use of AR antagonists that bind to the LBD. Drug resistance occurs due to adaptive AR upregulation and the appearance of splice variants that lack the LBD and become constitutively active. Bipolar T treatment and NTD-antagonists could surmount these resistance mechanisms, respectively. These recent advances in AR signaling are described.
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Affiliation(s)
- Greg Van-Duyne
- Department of Biophysics & Biochemistry, Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, United States
| | - Ian A Blair
- Department of Systems Pharmacology & Translational Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, United States
| | - Cynthia Sprenger
- Division of Gerontology & Geriatric Medicine, Department of Medicine, University of Washington and GRECC, Seattle, WA, United States
| | - Vera Moiseenkova-Bell
- Department of Systems Pharmacology & Translational Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, United States
| | - Stephen Plymate
- Division of Gerontology & Geriatric Medicine, Department of Medicine, University of Washington and GRECC, Seattle, WA, United States
| | - Trevor M Penning
- Department of Systems Pharmacology & Translational Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, PA, United States.
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Grypari IM, Tzelepi V, Gyftopoulos K. DNA Damage Repair Pathways in Prostate Cancer: A Narrative Review of Molecular Mechanisms, Emerging Biomarkers and Therapeutic Targets in Precision Oncology. Int J Mol Sci 2023; 24:11418. [PMID: 37511177 PMCID: PMC10380086 DOI: 10.3390/ijms241411418] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 07/09/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023] Open
Abstract
Prostate cancer (PCa) has a distinct molecular signature, including characteristic chromosomal translocations, gene deletions and defective DNA damage repair mechanisms. One crucial pathway involved is homologous recombination deficiency (HRD) and it is found in almost 20% of metastatic castrate-resistant PCa (mCRPC). Inherited/germline mutations are associated with a hereditary predisposition to early PCa development and aggressive behavior. BRCA2, ATM and CHECK2 are the most frequently HRD-mutated genes. BRCA2-mutated tumors have unfavorable clinical and pathological characteristics, such as intraductal carcinoma. PARP inhibitors, due to the induction of synthetic lethality, have been therapeutically approved for mCRPC with HRD alterations. Mutations are detected in metastatic tissue, while a liquid biopsy is utilized during follow-up, recognizing acquired resistance mechanisms. The mismatch repair (MMR) pathway is another DNA repair mechanism implicated in carcinogenesis, although only 5% of metastatic PCa is affected. It is associated with aggressive disease. PD-1 inhibitors have been used in MMR-deficient tumors; thus, the MMR status should be tested in all metastatic PCa cases. A surrogate marker of defective DNA repair mechanisms is the tumor mutational burden. PDL-1 expression and intratumoral lymphocytes have ambivalent predictive value. Few experimental molecules have been so far proposed as potential biomarkers. Future research may further elucidate the role of DNA damage pathways in PCa, revealing new therapeutic targets and predictive biomarkers.
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Affiliation(s)
- Ioanna-Maria Grypari
- Cytology Department, Aretaieion University Hospital, National Kapodistrian University of Athens, 11528 Athens, Greece
| | - Vasiliki Tzelepi
- Department of Pathology, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Kostis Gyftopoulos
- Department of Anatomy, School of Medicine, University of Patras, 26504 Patras, Greece
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Constantin TA, Varela-Carver A, Greenland KK, de Almeida GS, Olden E, Penfold L, Ang S, Ormrod A, Leach DA, Lai CF, Ainscow EK, Bahl AK, Carling D, Fuchter MJ, Ali S, Bevan CL. The CDK7 inhibitor CT7001 (Samuraciclib) targets proliferation pathways to inhibit advanced prostate cancer. Br J Cancer 2023; 128:2326-2337. [PMID: 37076563 PMCID: PMC10241923 DOI: 10.1038/s41416-023-02252-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 03/15/2023] [Accepted: 03/21/2023] [Indexed: 04/21/2023] Open
Abstract
BACKGROUND Current strategies to inhibit androgen receptor (AR) are circumvented in castration-resistant prostate cancer (CRPC). Cyclin-dependent kinase 7 (CDK7) promotes AR signalling, in addition to established roles in cell cycle and global transcription, providing a rationale for its therapeutic targeting in CRPC. METHODS The antitumour activity of CT7001, an orally bioavailable CDK7 inhibitor, was investigated across CRPC models in vitro and in xenograft models in vivo. Cell-based assays and transcriptomic analyses of treated xenografts were employed to investigate the mechanisms driving CT7001 activity, alone and in combination with the antiandrogen enzalutamide. RESULTS CT7001 selectively engages with CDK7 in prostate cancer cells, causing inhibition of proliferation and cell cycle arrest. Activation of p53, induction of apoptosis, and suppression of transcription mediated by full-length and constitutively active AR splice variants contribute to antitumour efficacy in vitro. Oral administration of CT7001 represses growth of CRPC xenografts and significantly augments growth inhibition achieved by enzalutamide. Transcriptome analyses of treated xenografts indicate cell cycle and AR inhibition as the mode of action of CT7001 in vivo. CONCLUSIONS This study supports CDK7 inhibition as a strategy to target deregulated cell proliferation and demonstrates CT7001 is a promising CRPC therapeutic, alone or in combination with AR-targeting compounds.
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Affiliation(s)
- Theodora A Constantin
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Anabel Varela-Carver
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Kyle K Greenland
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Gilberto Serrano de Almeida
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Ellen Olden
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Lucy Penfold
- MRC London Institute of Medical Sciences, Imperial College London, Hammersmith Hospital, London, UK
| | - Simon Ang
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Alice Ormrod
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Damien A Leach
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Chun-Fui Lai
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Edward K Ainscow
- Carrick Therapeutics, Nova UCD, Bellfield Innovation Park, Dublin, 4, Ireland
| | - Ash K Bahl
- Carrick Therapeutics, Nova UCD, Bellfield Innovation Park, Dublin, 4, Ireland
| | - David Carling
- MRC London Institute of Medical Sciences, Imperial College London, Hammersmith Hospital, London, UK
| | - Matthew J Fuchter
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, UK
| | - Simak Ali
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Charlotte L Bevan
- Imperial Centre for Translational and Experimental Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK.
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7
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Isebia KT, Lolkema MP, Jenster G, de Wit R, Martens JWM, van Riet J. A Compendium of AR Splice Variants in Metastatic Castration-Resistant Prostate Cancer. Int J Mol Sci 2023; 24:ijms24066009. [PMID: 36983083 PMCID: PMC10053078 DOI: 10.3390/ijms24066009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/20/2023] [Accepted: 03/21/2023] [Indexed: 03/30/2023] Open
Abstract
Treatment-induced AR alterations, including AR alternative splice variants (AR-Vs), have been extensively linked to harboring roles in primary and acquired resistance to conventional and next-generation hormonal therapies in prostate cancer and therefore have gained momentum. Our aim was to uniformly determine recurrent AR-Vs in metastatic castration-resistant prostate cancer (mCRPC) using whole transcriptome sequencing in order to assess which AR-Vs might hold potential diagnostic or prognostic relevance in future research. This study reports that in addition to the promising AR-V7 as a biomarker, AR45 and AR-V3 were also seen as recurrent AR-Vs and that the presence of any AR-V could be associated with higher AR expression. With future research, these AR-Vs may therefore harbor similar or complementary roles to AR-V7 as predictive and prognostic biomarkers in mCRPC or as proxies for abundant AR expression.
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Affiliation(s)
- Khrystany T Isebia
- Department of Medical Oncology and Cancer Genomics Netherlands, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands
| | - Martijn P Lolkema
- Department of Medical Oncology and Cancer Genomics Netherlands, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands
| | - Guido Jenster
- Department of Medical Oncology and Cancer Genomics Netherlands, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands
| | - Ronald de Wit
- Department of Medical Oncology and Cancer Genomics Netherlands, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands
| | - John W M Martens
- Department of Medical Oncology and Cancer Genomics Netherlands, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands
| | - Job van Riet
- Department of Medical Oncology and Cancer Genomics Netherlands, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands
- Division of AI in Oncology, German Cancer Research Centre DKFZ, 69120 Heidelberg, Germany
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8
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Zhao S, Liao J, Zhang S, Shen M, Li X, Zhou L. The positive relationship between androgen receptor splice variant-7 expression and the risk of castration-resistant prostate cancer: A cumulative analysis. Front Oncol 2023; 13:1053111. [PMID: 36865799 PMCID: PMC9972874 DOI: 10.3389/fonc.2023.1053111] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 01/09/2023] [Indexed: 02/16/2023] Open
Abstract
Background At present, androgen deprivation therapy (ADT) is still the standard regimen for patients with metastatic and locally advanced prostate cancer (PCa). The level of androgen receptor splice variant-7 (AR-V7) in men with castration-resistant prostate cancer (CRPC) has been reported to be elevated compared with that in patients diagnosed with hormone-sensitive prostate cancer (HSPC). Aim Herein, we performed a systematic review and cumulative analysis to evaluate whether the expression of AR-V7 was significantly higher in patients with CRPC than in HSPC patients. Methods The commonly used databases were searched to identify the potential studies reporting the level of AR-V7 in CRPC and HSPC patients. The association between CRPC and the positive expression of AR-V7 was pooled by using the relative risk (RR) with the corresponding 95% confidence intervals (CIs) under a random-effects model. For detecting the potential bias and the heterogeneity of the included studies, sensitivity analysis and subgroup analysis were performed. Publication bias was assessed Egger's and Begg's tests. This study was registered on PROSPERO (ID: CRD42022297014). Results This cumulative analysis included 672 participants from seven clinical trials. The study group contained 354 CRPC patients, while the other group contained 318 HSPC patients. Pooled results from the seven eligible studies showed that the expression of positive AR-V7 was significantly higher in men with CRPC compared to those with HSPC (RR = 7.55, 95% CI: 4.61-12.35, p < 0.001). In the sensitivity analysis, the combined RRs did not change substantially, ranging from 6.85 (95% CI: 4.16-11.27, p < 0.001) to 9.84 (95% CI: 5.13-18.87, p < 0.001). In the subgroup analysis, a stronger association was detected in RNA in situ hybridization (RISH) measurement in American patients, and those studies were published before 2011 (all p < 0.001). There was no significant publication bias identified in our study. Conclusion Evidence from the seven eligible studies demonstrated that patients with CRPC had a significantly elevated positive expression of AR-V7. More investigations are still warranted to clarify the association between CRPC and AR-V7 testing. Systematic review registration https://www.crd.york.ac.uk/prospero/, identifier CRD42022297014.
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Affiliation(s)
- Shankun Zhao
- Department of Urology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, Zhejiang, China
| | - Jian Liao
- Department of Nephrology, Jiaxing Hospital of Traditional Chinese Medicine, Jiaxing, Zhejiang, China
| | - Shilong Zhang
- Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Maolei Shen
- Department of Urology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, Zhejiang, China
| | - Xin Li
- Department of Urology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, Zhejiang, China
| | - Libo Zhou
- Department of Urology, The First Affiliated Hospital of Nanchang University, Nanchang, China,*Correspondence: Libo Zhou,
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9
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Duan L, Chen YA, Liang Y, Chen Z, Lu J, Fang Y, Cao J, Lu J, Zhao H, Pong RC, Hernandez E, Kapur P, Tran TAT, Smith T, Martinez ED, Ahn JM, Hsieh JT, Luo JH, Liu ZP. Therapeutic targeting of histone lysine demethylase KDM4B blocks the growth of castration-resistant prostate cancer. Biomed Pharmacother 2023; 158:114077. [PMID: 36495660 PMCID: PMC10926092 DOI: 10.1016/j.biopha.2022.114077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/24/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022] Open
Abstract
Epigenetics is an emerging mechanism for tumorigenesis. Treatment that targets epigenetic regulators is becoming an attractive strategy for cancer therapy. The role of epigenetic therapy in prostate cancer (PCa) remains elusive. Previously we demonstrated that upregulation of histone lysine demethylase KDM4B correlated with the appearance of castration resistant prostate cancer (CRPC) and identified a small molecular inhibitor of KDM4B, B3. In this study, we further investigated the role of KDM4B in promoting PCa progression and tested the efficacy of B3 using clinically relevant PCa models including PCa cell line LNCaP and 22Rv1 and xenografts derived from these cell lines. In loss and gain-functional studies of KDM4B in PCa cells, we found that overexpression of KDM4B in LNCaP cells enhanced its tumorigenicity whereas knockdown of KDM4B in 22Rv1 cells reduced tumor growth in castrated mice. B3 suppressed the growth of 22Rv1 xenografts and sensitized tumor to anti-androgen receptor (AR) antagonist enzalutamide inhibition. B3 also inhibited 22Rv1 tumor growth synergistically with rapamycin, leading to cell apoptosis. Comparative transcriptomic analysis performed on KDM4B knockdown and B3-treated 22Rv1 cells revealed that B3 inhibited both H3K9me3 and H3K27me3 demethylase activities. Our studies establish KDM4B as a target for CRPC and B3 as a potential therapeutic agent. B3 as monotherapy or in combination with other anti-PCa therapeutics offers proof of principle for the clinical translation of epigenetic therapy targeting KDMs for CRPC patients.
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Affiliation(s)
- Lingling Duan
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yu-An Chen
- Department of Urology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yanping Liang
- Department of Urology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Zhenhua Chen
- Department of Urology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Jun Lu
- Department of Urology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Yong Fang
- Department of Urology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Jiazheng Cao
- Department of Urology, Jiangmen Hospital, Sun Yat-Sen University, Jiangmen 529030, China
| | - Jian Lu
- Department of Urology, Jiangmen Hospital, Sun Yat-Sen University, Jiangmen 529030, China
| | - Hongwei Zhao
- Department of Urology, Affiliated Yantai Yuhuangding Hospital, Qingdao University Medical College, Yantai 264000, China
| | - Rey-Chen Pong
- Department of Urology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Elizabeth Hernandez
- Department of Urology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Payal Kapur
- Department of Pathology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Tram Anh T Tran
- Department of Pharmacology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Tristan Smith
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Elisabeth D Martinez
- Department of Pharmacology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jung-Mo Ahn
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Jer-Tsong Hsieh
- Department of Urology, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jun-Hang Luo
- Department of Urology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China.
| | - Zhi-Ping Liu
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX 75390, USA; Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX 75390, USA.
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10
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Miller KJ, Henry I, Maylin Z, Smith C, Arunachalam E, Pandha H, Asim M. A compendium of Androgen Receptor Variant 7 target genes and their role in Castration Resistant Prostate Cancer. Front Oncol 2023; 13:1129140. [PMID: 36937454 PMCID: PMC10014620 DOI: 10.3389/fonc.2023.1129140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 02/13/2023] [Indexed: 03/05/2023] Open
Abstract
Persistent androgen receptor (AR) signalling is the main driver of prostate cancer (PCa). Truncated isoforms of the AR called androgen receptor variants (AR-Vs) lacking the ligand binding domain often emerge during treatment resistance against AR pathway inhibitors such as Enzalutamide. This review discusses how AR-Vs drive a more aggressive form of PCa through the regulation of some of their target genes involved in oncogenic pathways, enabling disease progression. There is a pressing need for the development of a new generation of AR inhibitors which can repress the activity of both the full-length AR and AR-Vs, for which the knowledge of differentially expressed target genes will allow evaluation of inhibition efficacy. This review provides a detailed account of the most common variant, AR-V7, the AR-V7 regulated genes which have been experimentally validated, endeavours to understand their relevance in aggressive AR-V driven PCa and discusses the utility of the downstream protein products as potential drug targets for PCa treatment.
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Affiliation(s)
| | | | - Zoe Maylin
- *Correspondence: Zoe Maylin, ; Mohammad Asim,
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11
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Androgen Receptor Signaling Inhibition in Advanced Castration Resistance Prostate Cancer: What Is Expected for the Near Future? Cancers (Basel) 2022; 14:cancers14246071. [PMID: 36551557 PMCID: PMC9776956 DOI: 10.3390/cancers14246071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/02/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022] Open
Abstract
The androgen signaling pathway is the cornerstone in the treatment of high risk or advanced prostate cancer patients. However, in recent years, different mechanisms of resistance have been defined in this field, limiting the efficacy of the currently approved antiandrogen drugs. Different therapeutic approaches are under research to assess the role of combination therapies against escape signaling pathways or the development of novel antiandrogen drugs to try to solve the primary or acquired resistance against androgen dependent or independent pathways. The present review aims to summarize the current state of androgen inhibition in the therapeutic algorithm of patients with advanced prostate cancer and the mechanisms of resistance to those available drugs. In addition, this review conducted a comprehensive overview of the main present and future research approaches in the field of androgen receptor inhibition to overcome these resistances and the potential new drugs under research coming into this setting.
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12
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Chen D, Chou FJ, Chen Y, Huang CP, Tian H, Wang Y, Niu Y, You B, Yeh S, Xing N, Chang C. Targeting the radiation-induced ARv7-mediated circNHS/miR-512-5p/XRCC5 signaling with Quercetin increases prostate cancer radiosensitivity. J Exp Clin Cancer Res 2022; 41:235. [PMID: 35918767 PMCID: PMC9347162 DOI: 10.1186/s13046-022-02287-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 02/13/2022] [Indexed: 11/24/2022] Open
Abstract
Background Radiation therapy (RT) with androgen deprivation therapy (ADT) is an effective therapy to suppress the locally advanced prostate cancer (PCa). However, we unexpectedly found that RT could also induce the androgen receptor splice variant 7 (ARv7) expression to decrease the radiosensitivity. Methods The study was designed to target ARv7 expression with Quercetin or ARv7-shRNA that leads to enhancing and increasing the radiation sensitivity to better suppress the PCa that involved the modulation of the circNHS/miR-512-5p/XRCC5 signaling. Results Mechanism studies revealed that RT-induced ARv7 may function via altering the circNHS/miR-512-5p/XRCC5 signaling to decrease the radiosensitivity. Results from preclinical studies using multiple in vitro cell lines and in vivo mouse models concluded that combining RT with the small molecule of Quercetin to target full-length AR and ARv7 could lead to better efficacy to suppress PCa progression. Conclusion Together, these results suggest that ARv7 may play key roles to alter the PCa radiosensitivity, and targeting this newly identified ARv7 mediated circNHS/miR-512-5p/XRCC5 signaling with Quercetin may help physicians to develop a novel RT to better suppress the progression of PCa. Supplementary Information The online version contains supplementary material available at 10.1186/s13046-022-02287-4.
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13
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Advances in the Current Understanding of the Mechanisms Governing the Acquisition of Castration-Resistant Prostate Cancer. Cancers (Basel) 2022; 14:cancers14153744. [PMID: 35954408 PMCID: PMC9367587 DOI: 10.3390/cancers14153744] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 07/29/2022] [Indexed: 11/17/2022] Open
Abstract
Despite aggressive treatment and androgen-deprivation therapy, most prostate cancer patients ultimately develop castration-resistant prostate cancer (CRPC), which is associated with high mortality rates. However, the mechanisms governing the development of CRPC are poorly understood, and androgen receptor (AR) signaling has been shown to be important in CRPC through AR gene mutations, gene overexpression, co-regulatory factors, AR shear variants, and androgen resynthesis. A growing number of non-AR pathways have also been shown to influence the CRPC progression, including the Wnt and Hh pathways. Moreover, non-coding RNAs have been identified as important regulators of the CRPC pathogenesis. The present review provides an overview of the relevant literature pertaining to the mechanisms governing the molecular acquisition of castration resistance in prostate cancer, providing a foundation for future, targeted therapeutic efforts.
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14
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Miller KJ, Asim M. Unravelling the Role of Kinases That Underpin Androgen Signalling in Prostate Cancer. Cells 2022; 11:cells11060952. [PMID: 35326402 PMCID: PMC8946764 DOI: 10.3390/cells11060952] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 02/07/2023] Open
Abstract
The androgen receptor (AR) signalling pathway is the key driver in most prostate cancers (PCa), and is underpinned by several kinases both upstream and downstream of the AR. Many popular therapies for PCa that target the AR directly, however, have been circumvented by AR mutation, such as androgen receptor variants. Some upstream kinases promote AR signalling, including those which phosphorylate the AR and others that are AR-regulated, and androgen regulated kinase that can also form feed-forward activation circuits to promotes AR function. All of these kinases represent potentially druggable targets for PCa. There has generally been a divide in reviews reporting on pathways upstream of the AR and those reporting on AR-regulated genes despite the overlap that constitutes the promotion of AR signalling and PCa progression. In this review, we aim to elucidate which kinases—both upstream and AR-regulated—may be therapeutic targets and require future investigation and ongoing trials in developing kinase inhibitors for PCa.
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15
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Likos E, Bhattarai A, Weyman CM, Shukla GC. The androgen receptor messenger RNA: what do we know? RNA Biol 2022; 19:819-828. [PMID: 35704670 PMCID: PMC9225383 DOI: 10.1080/15476286.2022.2084839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The Androgen Receptor (AR), transcriptionally activated by its ligands, testosterone and dihydrotestosterone (DHT), is widely expressed in cells and tissues, influencing normal biology and disease states. The protein product of the AR gene is involved in the regulation of numerous biological functions, including the development and maintenance of the normal prostate gland and of the cardiovascular, musculoskeletal and immune systems. Androgen signalling, mediated by AR protein, plays a crucial role in the development of prostate cancer (PCa), and is presumed to be involved in other cancers including those of the breast, bladder, liver and kidney. Significant research and reviews have focused on AR protein function; however, inadequate research and literature exist to define the function of AR mRNA in normal and cancer cells. The AR mRNA transcript is nearly 11 Kb long and contains a long 3’ untranslated region (UTR), suggesting its biological role in post-transcriptional regulation, consequently affecting the overall functions of both normal and cancer cells. Research has demonstrated that many biological activities, including RNA stability, translation, cellular trafficking and localization, are associated with the 3’ UTRs of mRNAs. In this review, we describe the potential role of the AR 3’ UTR and summarize RNA-binding proteins (RBPs) that interact with the AR mRNA to regulate post-transcriptional metabolism. We highlight the importance of AR mRNA as a critical modulator of carcinogenesis and its important role in developing therapy-resistant prostate cancer.
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Affiliation(s)
- Eviania Likos
- Department of Biological, Geo. and Evs. Sciences, Cleveland State University, Cleveland, OH, USA
| | - Asmita Bhattarai
- Department of Biological, Geo. and Evs. Sciences, Cleveland State University, Cleveland, OH, USA
| | - Crystal M Weyman
- Department of Biological, Geo. and Evs. Sciences, Cleveland State University, Cleveland, OH, USA.,Center for Gene Regulation in Health and Disease, Cleveland State University, Cleveland, OH, USA
| | - Girish C Shukla
- Department of Biological, Geo. and Evs. Sciences, Cleveland State University, Cleveland, OH, USA.,Center for Gene Regulation in Health and Disease, Cleveland State University, Cleveland, OH, USA
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16
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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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17
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Zhao R, Ma X, Bai L, Li X, Mamouni K, Yang Y, Liu H, Danaher A, Cook N, Kucuk O, Hodges RS, Gera L, Wu D. Overcoming prostate cancer drug resistance with a novel organosilicon small molecule. Neoplasia 2021; 23:1261-1274. [PMID: 34781084 PMCID: PMC8604682 DOI: 10.1016/j.neo.2021.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 10/06/2021] [Accepted: 11/04/2021] [Indexed: 12/25/2022]
Abstract
A major challenge to the treatment of advanced prostate cancer (PCa) is the development of resistance to androgen-deprivation therapy (ADT) and chemotherapy. It is imperative to discover effective therapies to overcome drug resistance and improve clinical outcomes. We have developed a novel class of silicon-containing compounds and evaluated the anticancer activities and mechanism of action using cellular and animal models of drug-resistant PCa. Five organosilicon compounds were evaluated for their anticancer activities in the NCI-60 panel and established drug-resistant PCa cell lines. GH1504 exhibited potent in vitro cytotoxicity in a broad spectrum of human cancer cells, including PCa cells refractory to ADT and chemotherapy. Molecular studies identified several potential targets of GH1504, most notably androgen receptor (AR), AR variant 7 (AR-v7) and survivin. Mechanistically, GH1504 may promote the protein turnover of AR, AR-v7 and survivin, thereby inducing apoptosis in ADT-resistant and chemoresistant PCa cells. Animal studies demonstrated that GH1504 effectively inhibited the in vivo growth of ADT-resistant CWR22Rv1 and chemoresistant C4-2B-TaxR xenografts in subcutaneous and intraosseous models. These preclinical results indicated that GH1504 is a promising lead that can be further developed as a novel therapy for drug-resistant PCa.
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Affiliation(s)
- Rui Zhao
- Department of Urology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China; Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Xiaowei Ma
- Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA; Department of Clinical Laboratory, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Lijuan Bai
- Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA; Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xin Li
- Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA; Center for Cancer Research and Therapeutic Development and Department of Biological Sciences, Clark Atlanta University, Atlanta, GA, USA
| | - Kenza Mamouni
- Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Yang Yang
- Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA; Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - HongYan Liu
- Dotquant LLC, CoMotion Labs at University of Washington, Seattle, WA, USA
| | - Alira Danaher
- Center for Cancer Research and Therapeutic Development and Department of Biological Sciences, Clark Atlanta University, Atlanta, GA, USA
| | - Nicholas Cook
- Center for Cancer Research and Therapeutic Development and Department of Biological Sciences, Clark Atlanta University, Atlanta, GA, USA
| | - Omer Kucuk
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA, USA; Department of Urology, Emory University School of Medicine, Atlanta, GA, USA
| | - Robert S Hodges
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Anschutz Medical Campus, School of Medicine, Aurora, CO, USA; AMP Discovery LLC, Aurora, CO, USA
| | - Lajos Gera
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Anschutz Medical Campus, School of Medicine, Aurora, CO, USA; AMP Discovery LLC, Aurora, CO, USA
| | - Daqing Wu
- Molecular Oncology and Biomarkers Program, Georgia Cancer Center, and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, USA; Center for Cancer Research and Therapeutic Development and Department of Biological Sciences, Clark Atlanta University, Atlanta, GA, USA; Department of Urology, Emory University School of Medicine, Atlanta, GA, USA; MetCure Therapeutics LLC, Atlanta, GA, USA.
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18
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Interplay of Epidermal Growth Factor Receptor and Signal Transducer and Activator of Transcription 3 in Prostate Cancer: Beyond Androgen Receptor Transactivation. Cancers (Basel) 2021; 13:cancers13143452. [PMID: 34298665 PMCID: PMC8307975 DOI: 10.3390/cancers13143452] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 07/01/2021] [Accepted: 07/06/2021] [Indexed: 01/16/2023] Open
Abstract
Prostate cancer (PCa) is one of the most common cancers in the world and causes thousands of deaths every year. Conventional therapy for PCa includes surgery and androgen deprivation therapy (ADT). However, about 10-20% of all PCa cases relapse; there is also the further development of castration resistant adenocarcinoma (CRPC-Adeno) or neuroendocrine (NE) PCa (CRPC-NE). Due to their androgen-insensitive properties, both CRPC-Adeno and CRPC-NE have limited therapeutic options. Accordingly, this study reveals the inductive mechanisms of CRPC (for both CRPC-Adeno and CRPC-NE) and fulfils an urgent need for the treatment of PCa patients. Although previous studies have illustrated the emerging roles of epidermal growth factor receptors (EGFR), signal transducer, and activator of transcription 3 (STAT3) signaling in the development of CRPC, the regulatory mechanisms of this interaction between EGFR and STAT3 is still unclear. Our recent studies have shown that crosstalk between EGFR and STAT3 is critical for NE differentiation of PCa. In this review, we have collected recent findings with regard to the involvement of EGFR and STAT3 in malignancy progression and discussed their interactions during the development of therapeutic resistance for PCa.
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19
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A Potential Role and Contribution of Androgens in Placental Development and Pregnancy. Life (Basel) 2021; 11:life11070644. [PMID: 34357016 PMCID: PMC8305703 DOI: 10.3390/life11070644] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/29/2021] [Accepted: 06/30/2021] [Indexed: 01/24/2023] Open
Abstract
Successful pregnancy requires the establishment of a highly regulated maternal-fetal environment. This is achieved through the harmonious regulation of steroid hormones, which modulate both maternal and fetal physiology, and are critical for pregnancy maintenance. Defects in steroidogenesis and steroid signaling can lead to pregnancy disorders or even fetal loss. The placenta is a multifunctional, transitory organ which develops at the maternal-fetal interface, and supports fetal development through endocrine signaling, the transport of nutrients and gas exchange. The placenta has the ability to adapt to adverse environments, including hormonal variations, trying to support fetal development. However, if placental function is impaired, or its capacity to adapt is exceeded, fetal development will be compromised. The goal of this review is to explore the relevance of androgens and androgen signaling during pregnancy, specifically in placental development and function. Often considered a mere precursor to placental estrogen synthesis, the placenta in fact secretes androgens throughout pregnancy, and not only contains the androgen steroid nuclear receptor, but also non-genomic membrane receptors for androgens, suggesting a role of androgen signaling in placental function. Moreover, a number of pregnancy disorders, including pre-eclampsia, gestational diabetes, intrauterine growth restriction, and polycystic ovarian syndrome, are associated with abnormal androgen levels and androgen signaling. Understanding the role of androgens in the placenta will provide a greater understanding of the pathophysiology of pregnancy disorders associated with androgen elevation and its consequences.
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20
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Wu MJ, Chen CJ, Lin TY, Liu YY, Tseng LL, Cheng ML, Chuu CP, Tsai HK, Kuo WL, Kung HJ, Wang WC. Targeting KDM4B that coactivates c-Myc-regulated metabolism to suppress tumor growth in castration-resistant prostate cancer. Theranostics 2021; 11:7779-7796. [PMID: 34335964 PMCID: PMC8315051 DOI: 10.7150/thno.58729] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 06/18/2021] [Indexed: 12/13/2022] Open
Abstract
Rationale: The progression of prostate cancer (PCa) to castration-resistant PCa (CRPC) despite continuous androgen deprivation therapy is a major clinical challenge. Over 90% of patients with CRPC exhibit sustained androgen receptor (AR) signaling. KDM4B that removes the repressive mark H3K9me3/2 is a transcriptional activator of AR and has been implicated in the development of CRPC. However, the mechanisms of KDM4B involvement in CRPC remain largely unknown. Here, we sought to demonstrate the molecular pathway mediated by KDM4B in CRPC and to provide proof-of-concept evidence that KDM4B is a potential CRPC target. Methods: CRPC cells (C4-2B or CWR22Rv1) depleted with KDM4B followed by cell proliferation (in vitro and xenograft), microarray, qRT-PCR, Seahorse Flux, and metabolomic analyses were employed to identify the expression and metabolic profiles mediated by KDM4B. Immunoprecipitation was used to determine the KDM4B-c-Myc interaction region. Reporter activity assay and ChIP analysis were used to characterize the KDM4B-c-Myc complex-mediated mechanistic actions. The clinical relevance between KDM4B and c-Myc was determined using UCSC Xena analysis and immunohistochemistry. Results: We showed that KDM4B knockdown impaired CRPC proliferation, switched Warburg to OXPHOS metabolism, and suppressed gene expressions including those targeted by c-Myc. We further demonstrated that KDM4B physically interacted with c-Myc and they were co-recruited to the c-Myc-binding sequence on the promoters of metabolic genes (LDHA, ENO1, and PFK). Importantly, KDM4B and c-Myc synergistically promoted the transactivation of the LDHA promoter in a demethylase-dependent manner. We also provided evidence that KDM4B and c-Myc are co-expressed in PCa tissue and that high expression of both is associated with worse clinical outcome. Conclusions: KDM4B partners with c-Myc and serves as a coactivator of c-Myc to directly enhance c-Myc-mediated metabolism, hence promoting CRPC progression. Targeting KDM4B is thus an alternative therapeutic strategy for advanced prostate cancers driven by c-Myc and AR.
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Affiliation(s)
- Meng-Jen Wu
- Institute of Molecular and Cellular Biology and Department of Life Science, National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - Chih-Jung Chen
- Department of Pathology and Laboratory Medicine, Taichung Veterans General Hospital, Taichung 40705, Taiwan
- School of Medicine, Chung Shan Medical University, Taichung, 40201, Taiwan
| | - Ting-Yu Lin
- Institute of Molecular and Cellular Biology and Department of Life Science, National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - Ying-Yuan Liu
- Institute of Molecular and Cellular Biology and Department of Life Science, National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - Lin-Lu Tseng
- Institute of Molecular and Cellular Biology and Department of Life Science, National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - Mei-Ling Cheng
- Department of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
| | - Chih-Pin Chuu
- Institute of Cellular and System Medicine, National Health Research Institutes, Miaoli 35053, Taiwan
| | - Huai-Kuang Tsai
- Institute of Information Science, Academia Sinica, Taipei, 11529, Taiwan
| | - Wen-Ling Kuo
- Division of Breast Surgery, General Surgery, Department of Surgery, Chang Gung Memorial Hospital Linko Medical Center, Taoyuan 333, Taiwan
| | - Hsing-Jien Kung
- Graduate Institute of Cancer Biology and Drug Discovery, Taipei Medical University, Taipei 110, Taiwan
- Department of Biochemistry and Molecular Medicine, University of California Davis School of Medicine, University of California Davis Cancer Centre, Sacramento, CA 95817, USA
| | - Wen-Ching Wang
- Institute of Molecular and Cellular Biology and Department of Life Science, National Tsing-Hua University, Hsinchu 30013, Taiwan
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21
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Kanayama M, Lu C, Luo J, Antonarakis ES. AR Splicing Variants and Resistance to AR Targeting Agents. Cancers (Basel) 2021; 13:2563. [PMID: 34071114 PMCID: PMC8197115 DOI: 10.3390/cancers13112563] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 05/19/2021] [Accepted: 05/20/2021] [Indexed: 12/23/2022] Open
Abstract
Over the past decade, advances in prostate cancer research have led to discovery and development of novel biomarkers and effective treatments. As treatment options diversify, it is critical to further develop and use optimal biomarkers for the purpose of maximizing treatment benefit and minimizing unwanted adverse effects. Because most treatments for prostate cancer target androgen receptor (AR) signaling, aberrations affecting this drug target are likely to emerge following the development of castration-resistant prostate cancer (CRPC), and it is conceivable that such aberrations may play a role in drug resistance. Among the many AR aberrations, we and others have been studying androgen receptor splice variants (AR-Vs), especially AR-V7, and have conducted preclinical and clinical studies to develop and validate the clinical utility of AR-V7 as a prognostic and potential predictive biomarker. In this review, we first describe mechanisms of AR-V generation, regulation and their functions from a molecular perspective. We then discuss AR-Vs from a clinical perspective, focusing on the significance of AR-Vs detected in different types of human specimens and AR-Vs as potential therapeutic targets.
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Affiliation(s)
- Mayuko Kanayama
- Department of Urology, James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (M.K.); (C.L.); (J.L.)
| | - Changxue Lu
- Department of Urology, James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (M.K.); (C.L.); (J.L.)
| | - Jun Luo
- Department of Urology, James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (M.K.); (C.L.); (J.L.)
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Emmanuel S. Antonarakis
- Department of Urology, James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (M.K.); (C.L.); (J.L.)
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
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22
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Fontana F, Limonta P. Dissecting the Hormonal Signaling Landscape in Castration-Resistant Prostate Cancer. Cells 2021; 10:1133. [PMID: 34067217 PMCID: PMC8151003 DOI: 10.3390/cells10051133] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 02/07/2023] Open
Abstract
Understanding the molecular mechanisms underlying prostate cancer (PCa) progression towards its most aggressive, castration-resistant (CRPC) stage is urgently needed to improve the therapeutic options for this almost incurable pathology. Interestingly, CRPC is known to be characterized by a peculiar hormonal landscape. It is now well established that the androgen/androgen receptor (AR) axis is still active in CRPC cells. The persistent activity of this axis in PCa progression has been shown to be related to different mechanisms, such as intratumoral androgen synthesis, AR amplification and mutations, AR mRNA alternative splicing, increased expression/activity of AR-related transcription factors and coregulators. The hypothalamic gonadotropin-releasing hormone (GnRH), by binding to its specific receptors (GnRH-Rs) at the pituitary level, plays a pivotal role in the regulation of the reproductive functions. GnRH and GnRH-R are also expressed in different types of tumors, including PCa. Specifically, it has been demonstrated that, in CRPC cells, the activation of GnRH-Rs is associated with a significant antiproliferative/proapoptotic, antimetastatic and antiangiogenic activity. This antitumor activity is mainly mediated by the GnRH-R-associated Gαi/cAMP signaling pathway. In this review, we dissect the molecular mechanisms underlying the role of the androgen/AR and GnRH/GnRH-R axes in CRPC progression and the possible therapeutic implications.
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Affiliation(s)
| | - Patrizia Limonta
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, 20133 Milano, Italy;
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23
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Cao H, Wang D, Gao R, Chen L, Feng Y. Down regulation of U2AF1 promotes ARV7 splicing and prostate cancer progression. Biochem Biophys Res Commun 2021; 541:56-62. [PMID: 33477033 DOI: 10.1016/j.bbrc.2020.12.111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Accepted: 12/23/2020] [Indexed: 12/17/2022]
Abstract
The present study aims to investigate the roles of U2 Small Nuclear RNA Auxiliary Factor 1 (U2AF1) in the resistance to anti-androgen treatment in prostate cancer and its underlying mechanism. U2AF1 and androgen receptor variant 7 (ARV7) knockdown and overexpression were introduced in PC3 and DU145 cells. In addition, a bicalutamide-resistant PC3 (PC3 BR) cell line was also constructed. Cell count, MTT and soft agar colony formation assays were performed to evaluate cell proliferation. qRT-PCR was applied to determine the mRNA levels of U2AF1, ARV7 and Mitogen-Activated Protein Kinase 1 (MAPK1). Western blot was used to determine the MAPK1 protein expression. A negative correlation between ARV7 and U2AF1 in prostate tumor tissues was observed. U2AF1 downregulation was correlated with poor prognosis in prostate cancer patients. U2AF1 exhibited a negative correlation with ARV7 and its downregulation promoted prostate cancer cell proliferation and bicalutamide resistance. The regulatory effects of U2AF1 on ARV7 splicing were associated with MAPK1. U2AF1 affected prostate cancer proliferation and anti-androgen resistance by regulating ARV7 splicing.
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Affiliation(s)
- Hongwen Cao
- Surgical Department I (Urology Department), Longhua Hospital Shanghai University of Traditional Chinese Medicine, No. 725 Wanping Road South, Xuhui District, Shanghai, 200032, China
| | - Dan Wang
- Surgical Department I (Urology Department), Longhua Hospital Shanghai University of Traditional Chinese Medicine, No. 725 Wanping Road South, Xuhui District, Shanghai, 200032, China
| | - Renjie Gao
- Surgical Department I (Urology Department), Longhua Hospital Shanghai University of Traditional Chinese Medicine, No. 725 Wanping Road South, Xuhui District, Shanghai, 200032, China
| | - Lei Chen
- Surgical Department I (Urology Department), Longhua Hospital Shanghai University of Traditional Chinese Medicine, No. 725 Wanping Road South, Xuhui District, Shanghai, 200032, China.
| | - Yigeng Feng
- Surgical Department I (Urology Department), Longhua Hospital Shanghai University of Traditional Chinese Medicine, No. 725 Wanping Road South, Xuhui District, Shanghai, 200032, China.
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24
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Asangani I, Blair IA, Van Duyne G, Hilser VJ, Moiseenkova-Bell V, Plymate S, Sprenger C, Wand AJ, Penning TM. Using biochemistry and biophysics to extinguish androgen receptor signaling in prostate cancer. J Biol Chem 2021; 296:100240. [PMID: 33384381 PMCID: PMC7949100 DOI: 10.1074/jbc.rev120.012411] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 12/19/2020] [Accepted: 12/31/2020] [Indexed: 12/12/2022] Open
Abstract
Castration resistant prostate cancer (CRPC) continues to be androgen receptor (AR) driven. Inhibition of AR signaling in CRPC could be advanced using state-of-the-art biophysical and biochemical techniques. Structural characterization of AR and its complexes by cryo-electron microscopy would advance the development of N-terminal domain (NTD) and ligand-binding domain (LBD) antagonists. The structural basis of AR function is unlikely to be determined by any single structure due to the intrinsic disorder of its NTD, which not only interacts with coregulators but likely accounts for the constitutive activity of AR-splice variants (SV), which lack the LBD and emerge in CRPC. Using different AR constructs lacking the LBD, their effects on protein folding, DNA binding, and transcriptional activity could reveal how interdomain coupling explains the activity of AR-SVs. The AR also interacts with coregulators that promote chromatin looping. Elucidating the mechanisms involved can identify vulnerabilities to treat CRPC, which do not involve targeting the AR. Phosphorylation of the AR coactivator MED-1 by CDK7 is one mechanism that can be blocked by the use of CDK7 inhibitors. CRPC gains resistance to AR signaling inhibitors (ARSI). Drug resistance may involve AR-SVs, but their role requires their reliable quantification by SILAC-mass spectrometry during disease progression. ARSI drug resistance also occurs by intratumoral androgen biosynthesis catalyzed by AKR1C3 (type 5 17β-hydroxysteroid dehydrogenase), which is unique in that its acts as a coactivator of AR. Novel bifunctional inhibitors that competitively inhibit AKR1C3 and block its coactivator function could be developed using reverse-micelle NMR and fragment-based drug discovery.
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Affiliation(s)
- Irfan Asangani
- Department Cancer Biology, Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ian A Blair
- Department Systems Pharmacology & Translational Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Gregory Van Duyne
- Department of Biochemistry & Biophysics, Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Vincent J Hilser
- Department of Biology, Johns Hopkins University, Baltimore, Maryland, USA
| | - Vera Moiseenkova-Bell
- Department Systems Pharmacology & Translational Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Stephen Plymate
- Division of Gerontology & Geriatric Medicine, Department of Medicine, University of Washington, and GRECC, Seattle, Washington, USA
| | - Cynthia Sprenger
- Division of Gerontology & Geriatric Medicine, Department of Medicine, University of Washington, and GRECC, Seattle, Washington, USA
| | - A Joshua Wand
- Department of Biochemistry & Biophysics, Texas A&M University, College Station, Texas, USA
| | - Trevor M Penning
- Department Systems Pharmacology & Translational Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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25
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Vlaeminck-Guillem V. Clinical utility of the nuclear-localized AR-V7 biomarker for treatment choice in metastatic castration-resistant prostate cancer. Transl Androl Urol 2020; 9:2483-2487. [PMID: 33457221 PMCID: PMC7807368 DOI: 10.21037/tau-20-968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Affiliation(s)
- Virginie Vlaeminck-Guillem
- Centre de Recherche en Cancérologie de Lyon, INSERM 1052 CNRS UMR5286, Centre Léon Berard, Université Claude Bernard Lyon 1, Lyon, France.,Service de Biochimie Biologie Moléculaire Sud, Centre Hospitalier Lyon Sud, Hospices Civils de Lyon, Pierre-Bénite, France
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26
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The Genetic Complexity of Prostate Cancer. Genes (Basel) 2020; 11:genes11121396. [PMID: 33255593 PMCID: PMC7760266 DOI: 10.3390/genes11121396] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/20/2020] [Accepted: 11/23/2020] [Indexed: 01/09/2023] Open
Abstract
Prostate cancer (PCa) is a major concern in public health, with many genetically distinct subsets. Genomic alterations in PCa are extraordinarily complex, and both germline and somatic mutations are of great importance in the development of this tumor. The aim of this review is to provide an overview of genetic changes that can occur in the development of PCa and their role in potential therapeutic approaches. Various pathways and mechanisms proposed to play major roles in PCa are described in detail to provide an overview of current knowledge.
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27
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Beketova E, Fang S, Owens JL, Liu S, Chen X, Zhang Q, Asberry AM, Deng X, Malola J, Huang J, Li C, Pili R, Elzey BD, Ratliff TL, Wan J, Hu CD. Protein Arginine Methyltransferase 5 Promotes pICln-Dependent Androgen Receptor Transcription in Castration-Resistant Prostate Cancer. Cancer Res 2020; 80:4904-4917. [PMID: 32999000 PMCID: PMC7669631 DOI: 10.1158/0008-5472.can-20-1228] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 07/30/2020] [Accepted: 09/18/2020] [Indexed: 12/12/2022]
Abstract
The majority of advanced prostate cancer therapies aim to inhibit androgen receptor (AR) signaling. However, AR reactivation inevitably drives disease progression to castration-resistant prostate cancer (CRPC). Here we demonstrate that protein arginine methyltransferase 5 (PRMT5) functions as an epigenetic activator of AR transcription in CRPC, requiring cooperation with a methylosome subunit pICln. In vitro and in xenograft tumors in mice, targeting PRMT5 or pICln suppressed growth of CRPC cells. Full-length AR and AR-V7 transcription activation required both PRMT5 and pICln but not MEP50. This activation of transcription was accompanied by PRMT5-mediated symmetric dimethylation of H4R3 at the proximal AR promoter. Further, knockdown of PRMT5 abolished the binding of pICln (but not vice versa) to the AR proximal promoter region, suggesting that PRMT5 recruits pICln to the AR promoter to activate AR transcription. Differential gene expression analysis in 22Rv1 cells confirmed that PRMT5 and pICln both regulate the androgen signaling pathway. In addition, PRMT5 and pICln protein expression positively correlated with AR and AR-V7 protein expression in CRPC tissues and their expression was highly correlated at the mRNA level across multiple publicly available CRPC datasets. Our results suggest that targeting PRMT5 or pICln may be explored as a novel therapy for CRPC treatment by suppressing expression of AR and AR splice variants to circumvent AR reactivation. SIGNIFICANCE: This study provides evidence that targeting PRMT5 can eliminate expression of AR and can be explored as a novel therapeutic approach to treat metastatic hormone-naïve and castration-resistant prostate cancer.
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Affiliation(s)
- Elena Beketova
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana.,Purdue University Interdisciplinary Life Sciences Graduate Program, Purdue University, West Lafayette, Indiana
| | - Shuyi Fang
- Department of BioHealth Informatics, Indiana University School of Informatics and Computing, Indiana University - Purdue University Indianapolis, Indianapolis, Indiana
| | - Jake L Owens
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana
| | - Sheng Liu
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana.,The Indiana University Simon Comprehensive Cancer Center, Indiana University, Indianapolis, Indiana
| | - Xufeng Chen
- Department of Pathology, Duke University School of Medicine, Durham, North Caroline
| | - Qingfu Zhang
- Department of Pathology, Duke University School of Medicine, Durham, North Caroline
| | - Andrew M Asberry
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana.,Purdue University Interdisciplinary Life Sciences Graduate Program, Purdue University, West Lafayette, Indiana
| | - Xuehong Deng
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana
| | - Jonathan Malola
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana
| | - Jiaoti Huang
- Department of Pathology, Duke University School of Medicine, Durham, North Caroline
| | - Chenglong Li
- Department of Medicinal Chemistry, University of Florida College of Pharmacy, Gainesville, Florida
| | - Roberto Pili
- Department of Medical Oncology, Indiana University Simon Comprehensive Cancer Center, Indianapolis, Indiana
| | - Bennett D Elzey
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana.,Purdue University Center for Cancer Research, Purdue University, West Lafayette, Indiana
| | - Timothy L Ratliff
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana.,Purdue University Center for Cancer Research, Purdue University, West Lafayette, Indiana
| | - Jun Wan
- Department of BioHealth Informatics, Indiana University School of Informatics and Computing, Indiana University - Purdue University Indianapolis, Indianapolis, Indiana. .,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana.,The Indiana University Simon Comprehensive Cancer Center, Indiana University, Indianapolis, Indiana.,The Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, Indiana
| | - Chang-Deng Hu
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana. .,Purdue University Center for Cancer Research, Purdue University, West Lafayette, Indiana
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28
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Role of androgen receptor splice variant-7 (AR-V7) in prostate cancer resistance to 2nd-generation androgen receptor signaling inhibitors. Oncogene 2020; 39:6935-6949. [PMID: 32989253 PMCID: PMC7655549 DOI: 10.1038/s41388-020-01479-6] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 08/19/2020] [Accepted: 09/15/2020] [Indexed: 01/24/2023]
Abstract
The role of truncated androgen receptor splice variant-7 (AR-V7) in prostate cancer biology is an unresolved question. Is it simply a marker of resistance to 2nd generation androgen receptor signaling inhibitors (ARSi) like Abiraterone Acetate (Abi) and Enzalutamide (Enza) or a functional driver of lethal resistance via its ligand-independent transcriptional activity? To resolve this question, the correlation between resistance to ARSi and genetic chances and expression of full length AR (AR-FL) vs. AR-V7 were evaluated in a series of independent patient-derived xenografts (PDXs). While all PDXs lack PTEN expression, there is no consistent requirement for mutation in TP53, RB1, BRCA2, PIK3CA, or MSH2, or expression of SOX2 or ERG and ARSi-resistance. Elevated expression of AR-FL alone is sufficient for Abi- but not Enza-resistance, even if AR-FL is gain-of-function (GOF) mutated. Enza-resistance is consistently correlated with enhanced AR-V7 expression. In vitro and in vivo growth responses of Abi-/Enza-resistant LNCaP-95 cells in which CRISPR-Cas9 was used to knockout AR-FL or AR-V7 alone or in combination were evaluated. Combining these growth responses with RNAseq analysis demonstrates that both AR-FL and AR-V7 dependent transcriptional complementation are needed for Abi/Enza resistance.
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29
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Chen Y, Lan T. Molecular Origin, Expression Regulation, and Biological Function of Androgen Receptor Splicing Variant 7 in Prostate Cancer. Urol Int 2020; 105:337-353. [PMID: 32957106 DOI: 10.1159/000510124] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 07/07/2020] [Indexed: 11/19/2022]
Abstract
The problem of resistance to therapy in prostate cancer (PCa) is multifaceted. Key determinants of drug resistance include tumor burden and growth kinetics, tumor heterogeneity, physical barriers, immune system and microenvironment, undruggable cancer drivers, and consequences of therapeutic pressures. With regard to the fundamental importance of the androgen receptor (AR) in all stages of PCa from tumorigenesis to progression, AR is postulated to have a continued critical role in castration-resistant prostate cancer (CRPC). Suppression of AR signaling mediated by the full-length AR (AR-FL) is the therapeutic goal of all AR-directed therapies. However, AR-targeting agents ultimately lead to AR aberrations that promote PCa progression and drug resistance. Among these AR aberrations, androgen receptor variant 7 (AR-V7) is gaining attention as a potential predictive marker for as well as one of the resistance mechanisms to the most current anti-AR therapies in CRPC. Meanwhile, development of next-generation drugs that directly or indirectly target AR-V7 signaling is urgently needed. In the present review of the current literature, we have summarized the origin, alternative splicing, expression induction, protein conformation, interaction with coregulators, relationship with AR-FL, transcriptional activity, and biological function of AR-V7 in PCa development and therapeutic resistance. We hope this review will help further understand the molecular origin, expression regulation, and role of AR-V7 in the progression of PCa and provide insight into the design of novel selective inhibitors of AR-V7 in PCa treatment.
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Affiliation(s)
- Ye Chen
- Department of Surgery and Anesthesiology, Joint Logistic Support 940 Hospital of CPLA, Lanzhou, China
| | - Tian Lan
- Department of Urology, Joint Logistic Support 940 Hospital of CPLA, Lanzhou, China,
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30
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Leung JK, Tam T, Wang J, Sadar MD. Isolation and characterization of castration-resistant prostate cancer LNCaP95 clones. Hum Cell 2020; 34:211-218. [PMID: 32954481 DOI: 10.1007/s13577-020-00435-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 09/13/2020] [Indexed: 12/14/2022]
Abstract
The androgen receptor (AR) is a validated therapeutic target for prostate cancer and has been a focus for drug development for more than six decades. Currently approved therapies that inhibit AR signaling, such as enzalutamide, rely solely on targeting the AR ligand-binding domain and, therefore, have limited efficacy on prostate cancer cells that express truncated, constitutively active AR splice variants (AR-Vs). The LNCaP95 cell line is a human prostate cancer cell line that expresses both functional full-length AR and AR-V7. LNCaP95 is a heterogeneous cell population that is resistant to enzalutamide, with its proliferation dependent on transcriptionally active AR-V7. The purpose of this study was to identify a LNCaP95 clone that would be useful for evaluating therapies for their effectiveness against enzalutamide-resistant prostate cancer cells. Seven clones from the LNCaP95 cell line were isolated and characterized using morphology, in vitro growth rate, and response to ralaniten (AR N-terminal domain inhibitor) and enzalutamide (antiandrogen). In vivo growth of the clones as subcutaneous xenografts was evaluated in castrated immunodeficient mice. All of the clones maintained the expression of full-length AR and AR-V7. Cell proliferation of the clones was insensitive to androgen and enzalutamide but importantly was inhibited by ralaniten, which is consistent with AR-Vs driving the proliferation of parental LNCaP95 cells. In castrated immunodeficient animals, the growth of subcutaneous xenografts of the D3 clone was the most reproducible compared to the parental cell line and other clones. These data support that the enzalutamide-resistant LNCaP95-D3 subline may be suitable as a xenograft tumor model for preclinical drug development with improved reproducibility.
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Affiliation(s)
- Jacky K Leung
- Genome Sciences Centre, BC Cancer, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Teresa Tam
- Genome Sciences Centre, BC Cancer, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Jun Wang
- Genome Sciences Centre, BC Cancer, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Marianne D Sadar
- Genome Sciences Centre, BC Cancer, 675 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada. .,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.
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