1
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He Y, Xu W, Xiao YT, Huang H, Gu D, Ren S. Targeting signaling pathways in prostate cancer: mechanisms and clinical trials. Signal Transduct Target Ther 2022; 7:198. [PMID: 35750683 PMCID: PMC9232569 DOI: 10.1038/s41392-022-01042-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 05/25/2022] [Accepted: 05/30/2022] [Indexed: 12/11/2022] Open
Abstract
Prostate cancer (PCa) affects millions of men globally. Due to advances in understanding genomic landscapes and biological functions, the treatment of PCa continues to improve. Recently, various new classes of agents, which include next-generation androgen receptor (AR) signaling inhibitors (abiraterone, enzalutamide, apalutamide, and darolutamide), bone-targeting agents (radium-223 chloride, zoledronic acid), and poly(ADP-ribose) polymerase (PARP) inhibitors (olaparib, rucaparib, and talazoparib) have been developed to treat PCa. Agents targeting other signaling pathways, including cyclin-dependent kinase (CDK)4/6, Ak strain transforming (AKT), wingless-type protein (WNT), and epigenetic marks, have successively entered clinical trials. Furthermore, prostate-specific membrane antigen (PSMA) targeting agents such as 177Lu-PSMA-617 are promising theranostics that could improve both diagnostic accuracy and therapeutic efficacy. Advanced clinical studies with immune checkpoint inhibitors (ICIs) have shown limited benefits in PCa, whereas subgroups of PCa with mismatch repair (MMR) or CDK12 inactivation may benefit from ICIs treatment. In this review, we summarized the targeted agents of PCa in clinical trials and their underlying mechanisms, and further discussed their limitations and future directions.
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Affiliation(s)
- Yundong He
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, China.
| | - Weidong Xu
- Department of Urology, Shanghai Changzheng Hospital, Shanghai, China
| | - Yu-Tian Xiao
- Department of Urology, Shanghai Changzheng Hospital, Shanghai, China.,Department of Urology, Shanghai Changhai Hospital, Shanghai, China
| | - Haojie Huang
- Department of Urology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - Di Gu
- Department of Urology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
| | - Shancheng Ren
- Department of Urology, Shanghai Changzheng Hospital, Shanghai, China.
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Calderon-Aparicio A, Wang BD. Prostate cancer: Alternatively spliced mRNA transcripts in tumor progression and their uses as therapeutic targets. Int J Biochem Cell Biol 2021; 141:106096. [PMID: 34653618 PMCID: PMC8639776 DOI: 10.1016/j.biocel.2021.106096] [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: 06/30/2021] [Revised: 10/08/2021] [Accepted: 10/10/2021] [Indexed: 10/20/2022]
Abstract
Prostate cancer is the most frequently diagnosed cancer and second leading cause of cancer deaths among American men. Current therapies show early antitumor responses, but ultimately lead to treatment resistance, relapse and poorer survival in patients. Alternative RNA splicing, a cell mechanism increasing the proteome diversity by producing multiple transcripts from a single gene, has been associated with prostate cancer development/progression. Reports showed that many aberrant mRNA splice variants are upregulated in prostate cancer, promoting malignancy through enhanced proliferation, metastasis, tumor growth, anti-apoptosis, and/or treatment resistance. Here, we discuss the oncogenic properties of aberrant splicing mechanisms underlying prostate cancer pathogenesis, as well as the uses of the splicing variants as potential diagnostics and treatment targets. Finally, we discuss the pharmacologic and molecular approaches for targeting aberrant splicing mechanisms as effective therapies to correct the splicing errors and overcome the drug resistance, ultimately improving the clinical outcome of prostate cancer patients.
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Affiliation(s)
- Ali Calderon-Aparicio
- Department of Pharmaceutical Sciences, School of Pharmacy and Health Professions, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA
| | - Bi-Dar Wang
- Department of Pharmaceutical Sciences, School of Pharmacy and Health Professions, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA.
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3
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Haas NB, LaRiviere MJ, Buckingham TH, Cherkas Y, Calara-Nielsen K, Foulk B, Patel J, Gross S, Smirnov D, Vaughn DJ, Amaravadi R, Wellen KE, Savitch SL, Majmundar KJ, Black TA, Yee SS, He M, Min EJ, Long Q, Jones JO, Pal SK, Carpenter EL. Blood-based gene expression signature associated with metastatic castrate-resistant prostate cancer patient response to abiraterone plus prednisone or enzalutamide. Prostate Cancer Prostatic Dis 2020; 24:448-456. [PMID: 33009489 DOI: 10.1038/s41391-020-00295-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 09/10/2020] [Accepted: 09/21/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND Precision medicine approaches for managing patients with metastatic castrate-resistant prostate cancer (mCRPC) are lacking. Non-invasive approaches for molecular monitoring of disease are urgently needed, especially for patients suffering from bone metastases for whom tissue biopsy is challenging. Here we utilized baseline blood samples to identify mCRPC patients most likely to benefit from abiraterone plus prednisone (AAP) or enzalutamide. METHODS Baseline blood samples were collected for circulating tumor cell (CTC) enumeration and qPCR-based gene expression analysis from 51 men with mCRPC beginning treatment with abiraterone or enzalutamide. RESULTS Of 51 patients (median age 68 years [51-82]), 22 received AAP (abiraterone 1000 mg/day plus prednisone 10 mg/day) and 29 received enzalutamide (160 mg/day). The cohort was randomly divided into training (n = 37) and test (n = 14) sets. Baseline clinical variables (Gleason score, PSA, testosterone, and hemoglobin), CTC count, and qPCR-based gene expression data for 141 genes/isoforms in CTC-enriched blood were analyzed with respect to overall survival (OS). Genes with expression most associated with OS included MSLN, ARG2, FGF8, KLK3, ESRP2, NPR3, CCND1, and WNT5A. Using a Cox-elastic net model for our test set, the 8-gene expression signature had a c-index of 0.87 (95% CI [0.80, 0.94]) and was more strongly associated with OS than clinical variables or CTC count alone, or a combination of the three variables. For patients with a low-risk vs. high-risk gene expression signature, median OS was not reached vs. 18 months, respectively (HR 5.32 [1.91-14.80], p = 0.001). For the subset of 41 patients for whom progression-free survival (PFS) data was available, the median PFS for patients with a low-risk vs high-risk gene expression signature was 20 vs. 5 months, respectively (HR 2.95 [1.46-5.98], p = 0.003). CONCLUSIONS If validated in a larger prospective study, this test may predict patients most likely to benefit from second-generation antiandrogen therapy.
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Affiliation(s)
- Naomi B Haas
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Michael J LaRiviere
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Thomas H Buckingham
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Yauheniya Cherkas
- Janssen, Pharmaceutical Companies of Johnson and Johnson, Spring House, PA, USA
| | - Karl Calara-Nielsen
- Janssen, Pharmaceutical Companies of Johnson and Johnson, Spring House, PA, USA
| | - Brad Foulk
- Janssen, Pharmaceutical Companies of Johnson and Johnson, Spring House, PA, USA
| | - Jaymala Patel
- Janssen, Pharmaceutical Companies of Johnson and Johnson, Spring House, PA, USA
| | - Steven Gross
- Janssen, Pharmaceutical Companies of Johnson and Johnson, Spring House, PA, USA
| | - Denis Smirnov
- Janssen, Pharmaceutical Companies of Johnson and Johnson, Spring House, PA, USA
| | - David J Vaughn
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Ravi Amaravadi
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Kathryn E Wellen
- Department of Cancer Biology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Samantha L Savitch
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Krishna J Majmundar
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Taylor A Black
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Stephanie S Yee
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Miaoling He
- Department of Medical Oncology and Therapeutics Research, City of Hope, Duarte, CA, USA
| | - Eun Jeong Min
- Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Qi Long
- Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Jeremy O Jones
- Department of Medical Oncology and Therapeutics Research, City of Hope, Duarte, CA, USA
| | - Sumanta K Pal
- Department of Medical Oncology and Therapeutics Research, City of Hope, Duarte, CA, USA
| | - Erica L Carpenter
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
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Giacomini A, Grillo E, Rezzola S, Ribatti D, Rusnati M, Ronca R, Presta M. The FGF/FGFR system in the physiopathology of the prostate gland. Physiol Rev 2020; 101:569-610. [PMID: 32730114 DOI: 10.1152/physrev.00005.2020] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Fibroblast growth factors (FGFs) are a family of proteins possessing paracrine, autocrine, or endocrine functions in a variety of biological processes, including embryonic development, angiogenesis, tissue homeostasis, wound repair, and cancer. Canonical FGFs bind and activate tyrosine kinase FGF receptors (FGFRs), triggering intracellular signaling cascades that mediate their biological activity. Experimental evidence indicates that FGFs play a complex role in the physiopathology of the prostate gland that ranges from essential functions during embryonic development to modulation of neoplastic transformation. The use of ligand- and receptor-deleted mouse models has highlighted the requirement for FGF signaling in the normal development of the prostate gland. In adult prostate, the maintenance of a functional FGF/FGFR signaling axis is critical for organ homeostasis and function, as its disruption leads to prostate hyperplasia and may contribute to cancer progression and metastatic dissemination. Dissection of the molecular landscape modulated by the FGF family will facilitate ongoing translational efforts directed toward prostate cancer therapy.
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Affiliation(s)
- Arianna Giacomini
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
| | - Elisabetta Grillo
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
| | - Sara Rezzola
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
| | - Domenico Ribatti
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
| | - Marco Rusnati
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
| | - Roberto Ronca
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
| | - Marco Presta
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy; Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, University of Bari Medical School, Bari, Italy; and Italian Consortium for Biotechnology, Unit of Brescia, Brescia, Italy
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Olender J, Lee NH. Role of Alternative Splicing in Prostate Cancer Aggressiveness and Drug Resistance in African Americans. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1164:119-139. [PMID: 31576545 PMCID: PMC6777849 DOI: 10.1007/978-3-030-22254-3_10] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Alternative splicing, the process of removing introns and joining exons of pre-mRNA, is critical for growth, development, tissue homeostasis, and species diversity. Dysregulation of alternative splicing can initiate and drive disease. Aberrant alternative splicing has been shown to promote the "hallmarks of cancer" in both hematological and solid cancers. Of interest, recent work has focused on the role of alternative splicing in prostate cancer and prostate cancer health disparities. We will provide a review of prostate cancer health disparities involving the African American population, alternative RNA splicing, and alternative splicing in prostate cancer. Lastly, we will summarize our work on differential alternative splicing in prostate cancer disparities and its implications for disparate health outcomes and therapeutic targets.
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Affiliation(s)
- Jacqueline Olender
- Department of Pharmacology and Physiology, GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC, USA
| | - Norman H Lee
- Department of Pharmacology and Physiology, GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC, USA.
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6
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Wang BD, Lee NH. Aberrant RNA Splicing in Cancer and Drug Resistance. Cancers (Basel) 2018; 10:E458. [PMID: 30463359 PMCID: PMC6266310 DOI: 10.3390/cancers10110458] [Citation(s) in RCA: 113] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 11/15/2018] [Accepted: 11/15/2018] [Indexed: 12/22/2022] Open
Abstract
More than 95% of the 20,000 to 25,000 transcribed human genes undergo alternative RNA splicing, which increases the diversity of the proteome. Isoforms derived from the same gene can have distinct and, in some cases, opposing functions. Accumulating evidence suggests that aberrant RNA splicing is a common and driving event in cancer development and progression. Moreover, aberrant splicing events conferring drug/therapy resistance in cancer is far more common than previously envisioned. In this review, aberrant splicing events in cancer-associated genes, namely BCL2L1, FAS, HRAS, CD44, Cyclin D1, CASP2, TMPRSS2-ERG, FGFR2, VEGF, AR and KLF6, will be discussed. Also highlighted are the functional consequences of aberrant splice variants (BCR-Abl35INS, BIM-γ, IK6, p61 BRAF V600E, CD19-∆2, AR-V7 and PIK3CD-S) in promoting resistance to cancer targeted therapy or immunotherapy. To overcome drug resistance, we discuss opportunities for developing novel strategies to specifically target the aberrant splice variants or splicing machinery that generates the splice variants. Therapeutic approaches include the development of splice variant-specific siRNAs, splice switching antisense oligonucleotides, and small molecule inhibitors targeting splicing factors, splicing factor kinases or the aberrant oncogenic protein isoforms.
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Affiliation(s)
- Bi-Dar Wang
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA.
| | - Norman H Lee
- Department of Pharmacology and Physiology, School of Medicine and Health Sciences, George Washington University, GW Cancer Center, Washington, DC 20037, USA.
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7
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Liu H, Lin X, Huang T, Song L, Zhu C, Ma H, Long T, Zeng H, Li R, Wang H, Huang Y, Chen L, Wu X. A short peptide reverses the aggressive phenotype of prostate cancer cells. Eur J Pharmacol 2018; 838:129-137. [PMID: 30196111 DOI: 10.1016/j.ejphar.2018.09.013] [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: 05/22/2018] [Revised: 09/05/2018] [Accepted: 09/05/2018] [Indexed: 11/17/2022]
Abstract
Previous studies have demonstrated that fibroblast growth factor 8b (FGF8b) is up-regulated in a large proportion of prostate cancer patients, and plays a key role in the aggressive progress of prostate cancer. Herein, we investigated the effects of a short peptide derived from the gN helix domain of FGF8b on the metastatic behaviors of prostate cancer cells. The results demonstrated that the synthetic peptide might reverse the effects of FGF8b on cell proliferation, migration and invasion by suppressing the activation of MAPK and Akt signaling cascades, and reducing the expressions of the metastasis-related proteins, resulting in suppression of the aggressive phenotype of the prostate cancer cells. Collectively, these results underline the therapeutic potential of the FGF8b mimic peptide in advanced prostate cancer.
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Affiliation(s)
- Hongjiao Liu
- Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Xiaomian Lin
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Tao Huang
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Li Song
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Cairong Zhu
- Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China.
| | - Hongmin Ma
- Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Tianzhu Long
- Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Huixuan Zeng
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Rongzhen Li
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Heng Wang
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Yishan Huang
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Liankuai Chen
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China
| | - Xiaoping Wu
- Institute of Tissue Transplantation and Immunology, Jinan University, Guangzhou 510632, China.
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8
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Choi YJ, Kim HS, Park SH, Kim BS, Kim KH, Lee HJ, Song HS, Shin DY, Lee HY, Kim HG, Lee KH, Lee JL, Park KH. Phase II Study of Dovitinib in Patients with Castration-Resistant Prostate Cancer (KCSG-GU11-05). Cancer Res Treat 2018; 50:1252-1259. [PMID: 29334610 PMCID: PMC6192917 DOI: 10.4143/crt.2017.438] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 12/28/2017] [Indexed: 12/21/2022] Open
Abstract
Purpose Fibroblast growth factor (FGF) signals are important in carcinogenesis and progression of prostate cancer. Dovitinib is an oral, pan-class inhibitor of vascular endothelial growth factor receptor (VEGFR), platelet-derived growth factor receptor, and fibroblast growth factor receptor (FGFR). We evaluated the efficacy and toxicity of dovitinib in men with metastatic castration resistant prostate cancer (mCRPC). Materials and Methods This study was a single-arm, phase II, open-label, multicenter trial of dovitinib 500 mg/day (5-days-on/2-days-off schedule). The primary endpoint was 16-week progression-free survival (PFS). Secondary endpoints were overall survival (OS), toxicity and prostate-specific antigen (PSA) response rate. Biomarker analyses for VEGFR2, FGF23, and FGFR2 using multiplex enzyme-linked immunosorbent assay was performed. Results Forty-four men were accrued from 11 hospitals. Eighty percent were post-docetaxel. Median PSA was 100 ng/dL, median age was 69, 82% had bone metastases, and 23% had liver metastases. Median cycles of dovitinib was 2 (range, 0 to 33). Median PFS was 3.67 months (95% confidence interval [CI], 1.36 to 5.98) and median OS was 13.70 months (95% CI, 0 to 27.41). Chemotherapy-naïve patients had longer PFS (17.90 months; 95% CI, 9.23 to 28.57) compared with docetaxel-treated patients (2.07 months; 95% CI, 1.73 to 2.41; p=0.001) and the patients with high serum VEGFR2 level over median level (7,800 pg/mL) showed longer PFS compared with others (6.03 months [95% CI, 4.26 to 7.80] vs. 1.97 months [95% CI, 1.79 to 2.15], p=0.023). Grade 3 related adverse events were seen in 40.9% of patients. Grade 1-2 nausea, diarrhea, fatigue, anorexia, and all grade thrombocytopenia are common. Conclusion Dovitinib showed modest antitumor activity with manageable toxicities in men with mCRPC. Especially, patients who were chemo-naïve benefitted from dovitinib.
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Affiliation(s)
- Yoon Ji Choi
- Division of Oncology/Hematology, Department of Internal Medicine, Korea University Anam Hospital, Seoul, Korea
| | - Hye Sook Kim
- Division of Oncology/Hematology, Department of Internal Medicine, Korea University Anam Hospital, Seoul, Korea
| | - Se Hoon Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Bong-Seog Kim
- Division of Hemato-Oncology, Department of Internal Medicine, Veterans Health Service Medical Center, Seoul, Korea
| | - Kyoung Ha Kim
- Division of Hematology-Oncology, Department of Internal Medicine, Soonchunhyang University Hospital, Soonchunhyang University College of Medicine, Seoul, Korea
| | - Hyo Jin Lee
- Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
| | - Hong Suk Song
- Division of Hematology/Oncology, Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea
| | - Dong-Yeop Shin
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.,Department of Internal Medicine, Korea Cancer Center Hospital, Seoul, Korea
| | - Ha Young Lee
- Dongnam Institute of Radiological and Medical Sciences, Busan, Korea
| | - Hoon-Gu Kim
- Department of Internal Medicine, Gyeongsang Institute of Health Sciences, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Korea
| | - Kyung Hee Lee
- Department of Hemato-oncology, Yeungnam Medical Center, Daegu, Korea
| | - Jae Lyun Lee
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Kyong Hwa Park
- Division of Oncology/Hematology, Department of Internal Medicine, Korea University Anam Hospital, Seoul, Korea
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9
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Ramalingam S, Ramamurthy VP, Njar VCO. Dissecting major signaling pathways in prostate cancer development and progression: Mechanisms and novel therapeutic targets. J Steroid Biochem Mol Biol 2017; 166:16-27. [PMID: 27481707 PMCID: PMC7371258 DOI: 10.1016/j.jsbmb.2016.07.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 07/08/2016] [Accepted: 07/12/2016] [Indexed: 12/19/2022]
Abstract
Prostate cancer (PCa) is the most frequently diagnosed non-cutaneous malignancy and leading cause of cancer mortality in men. At the initial stages, prostate cancer is dependent upon androgens for their growth and hence effectively combated by androgen deprivation therapy (ADT). However, most patients eventually recur with an androgen deprivation-resistant phenotype, referred to as castration-resistant prostate cancer (CRPC), a more aggressive form for which there is no effective therapy presently available. The current review is an attempt to cover and establish an understanding of some major signaling pathways implicated in prostate cancer development and castration-resistance, besides addressing therapeutic strategies that targets the key signaling mechanisms.
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Affiliation(s)
- Senthilmurugan Ramalingam
- Department of Pharmacology, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA; Center for Biomolecular Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA
| | - Vidya P Ramamurthy
- Department of Pharmacology, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA; Center for Biomolecular Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA
| | - Vincent C O Njar
- Department of Pharmacology, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA; Center for Biomolecular Therapeutics, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA; Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, 685 West Baltimore Street, Baltimore, MD 21201-1559, USA.
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10
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Applying for research funding. Part 2 – Writing a grant application. JOURNAL OF CLINICAL UROLOGY 2016. [DOI: 10.1177/2051415816630212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objective: The process of writing a grant application can be challenging. In this article we summarise key aspects of the process including when to begin, whom to submit to and how to construct a research hypothesis. It is intended that this article will be a useful resource for individuals seeking to embark on research as part of a higher degree.
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11
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Li X, Wang C, Xiao J, McKeehan WL, Wang F. Fibroblast growth factors, old kids on the new block. Semin Cell Dev Biol 2016; 53:155-67. [PMID: 26768548 DOI: 10.1016/j.semcdb.2015.12.014] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 12/18/2015] [Indexed: 01/08/2023]
Abstract
The fibroblast growth factors (FGFs) are a family of cell intrinsic regulatory peptides that control a broad spectrum of cellular activities. The family includes canonic FGFs that elicit their activities by activating the FGF receptor (FGFR) tyrosine kinase and non-canonic members that elicit their activities intracellularly and via FGFR-independent mechanisms. The FGF signaling axis is highly complex due to the existence of multiple isoforms of both ligands and receptors, as well as cofactors that include the chemically heterogeneous heparan sulfate (HS) cofactors, and in the case of endocrine FGFs, the Klotho coreceptors. Resident FGF signaling controls embryonic development, maintains tissue homeostasis, promotes wound healing and tissue regeneration, and regulates functions of multiple organs. However, ectopic or aberrant FGF signaling is a culprit for various diseases, including congenital birth defects, metabolic disorder, and cancer. The molecular mechanisms by which the specificity of FGF signaling is achieved remain incompletely understood. Since its application as a druggable target has been gradually recognized by pharmaceutical companies and translational researchers, understanding the determinants of FGF signaling specificity has become even more important in order to get into the position to selectively suppress a particular pathway without affecting others to minimize side effects.
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Affiliation(s)
- Xiaokun Li
- College of Pharmacy, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Cong Wang
- College of Pharmacy, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| | - Jian Xiao
- College of Pharmacy, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Wallace L McKeehan
- Institute of Biosciences and Technology, Texas A&M University Health Science Center, Houston, TX 77030-3303, United States
| | - Fen Wang
- Institute of Biosciences and Technology, Texas A&M University Health Science Center, Houston, TX 77030-3303, United States.
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Liu R, Huang S, Lei Y, Zhang T, Wang K, Liu B, Nice EC, Xiang R, Xie K, Li J, Huang C. FGF8 promotes colorectal cancer growth and metastasis by activating YAP1. Oncotarget 2015; 6:935-52. [PMID: 25473897 PMCID: PMC4359266 DOI: 10.18632/oncotarget.2822] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 11/25/2014] [Indexed: 02/05/2023] Open
Abstract
Colorectal cancer (CRC) is a major cause of cancer-related death worldwide. The poor prognosis of CRC is mainly due to uncontrolled tumor growth and distant metastases. In this study, we found that the level of FGF8 was elevated in the great majority of CRC cases and high FGF8 expression was significantly correlated with lymph nodes metastasis and worse overall survival. Functional studies showed that FGF8 can induce a more aggressive phenotype displaying epithelial-to-mesenchymal transition (EMT) and enhanced invasion and growth in CRC cells. Consistent with this, FGF8 can also promote tumor growth and metastasis in mouse models. Bioinformatics and pathological analysis suggested that YAP1 is a potential downstream target of FGF8 in CRC cells. Molecular validation demonstrated that FGF8 fully induced nuclear localization of YAP1 and enhanced transcriptional outcomes such as the expression of CTGF and CYR61, while decreasing YAP1 expression impeded FGF-8–induced cell growth, EMT, migration and invasion, revealing that YAP1 is required for FGF8-mediated CRC growth and metastasis. Taken together, these results demonstrate that FGF8 contributes to the proliferative and metastatic capacity of CRC cells and may represent a novel candidate for intervention in tumor growth and metastasis formation.
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Affiliation(s)
- Rui Liu
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, Chengdu, P. R. China.,State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, P. R. China
| | - Shan Huang
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, Chengdu, P. R. China
| | - Yunlong Lei
- Department of Biochemistry and Molecular Biology, and Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing, P. R. China
| | - Tao Zhang
- The School of Biomedical Sciences, Chengdu Medical College, Chengdu, P. R. China
| | - Kui Wang
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, Chengdu, P. R. China
| | - Bo Liu
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, Chengdu, P. R. China
| | - Edouard C Nice
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Rong Xiang
- School of Medicine, Nankai University, Tianjin, P.R. China
| | - Ke Xie
- Department of Oncology, Sichuan Provincial People's Hospital, Chengdu, P. R. China
| | - Jingyi Li
- The School of Biomedical Sciences, Chengdu Medical College, Chengdu, P. R. China
| | - Canhua Huang
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, Chengdu, P. R. China
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13
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Chen N, Ma J, Zhao Y, Wu M, Yang H, Gong W, Chao J, Li X. Expression of functional recombinant human fibroblast growth factor 8b and its protective effects on MPP⁺-lesioned PC12 cells. Appl Microbiol Biotechnol 2015; 100:625-35. [PMID: 26411459 DOI: 10.1007/s00253-015-7004-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 09/01/2015] [Accepted: 09/10/2015] [Indexed: 12/29/2022]
Abstract
Human fibroblast growth factor 8b (FGF8b) was expressed based on a baculovirus expression vector system (BEVS) and identified as having a protective effect on Parkinson's disease. Immunoblotting demonstrated that rhFGF8b proteins were recognized by a human anti-FGF8b antibody. The multiplicity of infection and timing of harvest had a significant effect on protein yield and protein quality. Our results indicated that the rhFGF8b was first detectable at 36 h postinfection and reached a maximum at 60 h. A multiplicity of infection (MOI) of 8 pfu/mL was suitable for harvest. The target protein was purified by heparin-affinity chromatography. In vitro methylthiazol tetrazolium (MTT) assays demonstrated that the purified rhFGF8b could significantly stimulate proliferation of NIH3T3 cells. Furthermore, to elucidate the effect of rhFGF8b on Parkinson's disease, we used FGF8b pretreatment on a cell model of Parkinson's disease. The results indicated that rhFGF8b prevented necrosis and apoptosis of 1-METHYL-4-phenyl pyridine (MPP(+)) treated PC12 cells. Moreover, the effect of FGF8b on messenger RNA (mRNA) levels of apoptosis and ERS genes was investigated to clarify the molecular mechanisms of FGF8b. The results suggest that FGF8b exerts neuroprotective effects by alleviating endoplasmic reticulum (ER) stress during PD. These results suggest that FGF8b may be a promising candidate therapeutic drug for neurodegenerative diseases related to ER stress.
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Affiliation(s)
- Nazi Chen
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Jishen Ma
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Yang Zhao
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Meiyu Wu
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Huanhuan Yang
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Weiyue Gong
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China
| | - Jiang Chao
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China.
| | - Xiaokun Li
- School of Pharmaceutical Sciences, Zhejiang Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University, Wenzhou, 325035, China.
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14
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Ornitz DM, Itoh N. The Fibroblast Growth Factor signaling pathway. WILEY INTERDISCIPLINARY REVIEWS. DEVELOPMENTAL BIOLOGY 2015; 4:215-66. [PMID: 25772309 PMCID: PMC4393358 DOI: 10.1002/wdev.176] [Citation(s) in RCA: 1337] [Impact Index Per Article: 148.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 11/23/2014] [Accepted: 01/08/2015] [Indexed: 12/13/2022]
Abstract
The signaling component of the mammalian Fibroblast Growth Factor (FGF) family is comprised of eighteen secreted proteins that interact with four signaling tyrosine kinase FGF receptors (FGFRs). Interaction of FGF ligands with their signaling receptors is regulated by protein or proteoglycan cofactors and by extracellular binding proteins. Activated FGFRs phosphorylate specific tyrosine residues that mediate interaction with cytosolic adaptor proteins and the RAS-MAPK, PI3K-AKT, PLCγ, and STAT intracellular signaling pathways. Four structurally related intracellular non-signaling FGFs interact with and regulate the family of voltage gated sodium channels. Members of the FGF family function in the earliest stages of embryonic development and during organogenesis to maintain progenitor cells and mediate their growth, differentiation, survival, and patterning. FGFs also have roles in adult tissues where they mediate metabolic functions, tissue repair, and regeneration, often by reactivating developmental signaling pathways. Consistent with the presence of FGFs in almost all tissues and organs, aberrant activity of the pathway is associated with developmental defects that disrupt organogenesis, impair the response to injury, and result in metabolic disorders, and cancer. For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- David M Ornitz
- Department of Developmental Biology, Washington University School of MedicineSt. Louis, MO, USA
- *
Correspondence to:
| | - Nobuyuki Itoh
- Graduate School of Pharmaceutical Sciences, Kyoto UniversitySakyo, Kyoto, Japan
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15
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Lapuk AV, Volik SV, Wang Y, Collins CC. The role of mRNA splicing in prostate cancer. Asian J Androl 2014; 16:515-21. [PMID: 24830689 PMCID: PMC4104073 DOI: 10.4103/1008-682x.127825] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 02/12/2014] [Indexed: 12/23/2022] Open
Abstract
Alternative splicing (AS) is a crucial step in gene expression. It is subject to intricate regulation, and its deregulation in cancer can lead to a wide array of neoplastic phenotypes. A large body of evidence implicates splice isoforms in most if not all hallmarks of cancer, including growth, apoptosis, invasion and metastasis, angiogenesis, and metabolism. AS has important clinical implications since it can be manipulated therapeutically to treat cancer and represents a mechanism of resistance to therapy. In prostate cancer (PCa) AS also plays a prominent role and this review will summarize the current knowledge of alternatively spliced genes with important functional consequences. We will highlight accumulating evidence on AS of the components of the two critical pathways in PCa: androgen receptor (AR) and phosphoinositide 3-kinase (PI3K). These observations together with data on dysregulation of splice factors in PCa suggest that AR and PI3K pathways may be interconnected with previously unappreciated splicing regulatory networks. In addition, we will discuss several lines of evidence implicating splicing regulation in the development of the castration resistance.
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Affiliation(s)
- Anna V Lapuk
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
| | - Stanislav V Volik
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
| | - Yuzhuo Wang
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
- Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC, Canada
| | - Colin C Collins
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
- Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
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16
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Tumor models for prostate cancer exemplified by fibroblast growth factor 8-induced tumorigenesis and tumor progression. Reprod Biol 2014; 14:16-24. [PMID: 24607251 DOI: 10.1016/j.repbio.2014.01.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Accepted: 01/06/2014] [Indexed: 12/29/2022]
Abstract
Prostate cancer is a very common malignancy among Western males. Although most tumors are indolent and grow slowly, some grow and metastasize aggressively. Because prostate cancer growth is usually androgen-dependent, androgen ablation offers a therapeutic option to treat post-resection tumor recurrence or primarily metastasized prostate cancer. However, patients often relapse after the primary response to androgen ablation therapy, and there is no effective cure for cases of castration-resistant prostate cancer (CRPC). The mechanisms of tumor growth in CRPC are poorly understood. Although the androgen receptors (ARs) remain functional in CRPC, other mechanisms are clearly activated (e.g., disturbed growth factor signaling). Results from our laboratory and others have shown that dysregulation of fibroblast growth factor (FGF) signaling, including FGF receptor 1 (FGFR1) activation and FGF8b overexpression, has an important role in prostate cancer growth and progression. Several experimental models have been developed for prostate tumorigenesis and various stages of tumor progression. These models include genetically engineered mice and rats, as well as induced tumors and xenografts in immunodeficient mice. The latter was created using parental and genetically modified cell lines. All of these models greatly helped to elucidate the roles of different genes in prostate carcinogenesis and tumor progression. Recently, patient-derived xenografts have been studied for possible use in testing individual, specific responses of tumor tissue to different treatment options. Feasible and functional CRPC models for drug responsiveness analysis and the development of effective therapies targeting the FGF signaling pathway and other pathways in prostate cancer are being actively investigated.
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17
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Sharma M, Hudson JB, Adomat H, Guns E, Cox ME. <i>In Vitro</i> Anticancer Activity of Plant-Derived Cannabidiol on Prostate Cancer Cell Lines. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/pp.2014.58091] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Hetzl AC, Montico F, Lorencini RM, Kido LA, Cândido EM, Cagnon VHA. Prostatic microenvironment in senescence: fibroblastic growth factors × hormonal imbalance. Histochem Cell Biol 2013; 141:531-42. [DOI: 10.1007/s00418-013-1173-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2013] [Indexed: 01/08/2023]
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19
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A short peptide derived from the gN helix domain of FGF8b suppresses the growth of human prostate cancer cells. Cancer Lett 2013; 339:226-36. [DOI: 10.1016/j.canlet.2013.06.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 05/25/2013] [Accepted: 06/02/2013] [Indexed: 11/21/2022]
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20
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Corn PG, Wang F, McKeehan WL, Navone N. Targeting fibroblast growth factor pathways in prostate cancer. Clin Cancer Res 2013; 19:5856-66. [PMID: 24052019 DOI: 10.1158/1078-0432.ccr-13-1550] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Advanced prostate cancer carries a poor prognosis and novel therapies are needed. Research has focused on identifying mechanisms that promote angiogenesis and cellular proliferation during prostate cancer progression from the primary tumor to bone-the principal site of prostate cancer metastases. One candidate pathway is the fibroblast growth factor (FGF) axis. Aberrant expression of FGF ligands and FGF receptors leads to constitutive activation of multiple downstream pathways involved in prostate cancer progression including mitogen-activated protein kinase, phosphoinositide 3-kinase, and phospholipase Cγ. The involvement of FGF pathways in multiple mechanisms relevant to prostate tumorigenesis provides a rationale for the therapeutic blockade of this pathway, and two small-molecule tyrosine kinase inhibitors-dovitinib and nintedanib-are currently in phase II clinical development for advanced prostate cancer. Preliminary results from these trials suggest that FGF pathway inhibition represents a promising new strategy to treat castrate-resistant disease.
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Affiliation(s)
- Paul G Corn
- Authors' Affiliations: The University of Texas MD Anderson Cancer Center; and Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, Texas
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21
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Wang W, Chen X, Li T, Li Y, Wang R, He D, Luo W, Li X, Wu X. Screening a phage display library for a novel FGF8b-binding peptide with anti-tumor effect on prostate cancer. Exp Cell Res 2013; 319:1156-64. [DOI: 10.1016/j.yexcr.2013.02.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/01/2013] [Accepted: 02/02/2013] [Indexed: 10/27/2022]
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22
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Ahmad I, Singh LB, Yang ZH, Kalna G, Fleming J, Fisher G, Cooper C, Cuzick J, Berney DM, Møller H, Scardino P, Leung HY. Mir143 expression inversely correlates with nuclear ERK5 immunoreactivity in clinical prostate cancer. Br J Cancer 2013; 108:149-54. [PMID: 23321517 PMCID: PMC3553517 DOI: 10.1038/bjc.2012.510] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Background: Aberrant mitogen/extracellular signal-regulated kinase 5 (MEK5)–extracellular signal-regulated protein kinase 5 (ERK5)-mediated signalling has been implicated in a number of tumour types including prostate cancer (CaP). The mechanism for ERK5 activation in CaP remains to be fully elucidated. Studies have recently implicated the role of microRNA (miRNA) mir143 expression in the regulation of ERK5 expression. Methods: We utilised a tissue microarray (TMA) of 530 CaP cores from 168 individual patients and stained for both mir143 and ERK5. These TMAs were scored by a combination of observer and automated methods. Results: We observed a strong inverse relation between ERK5 and mir143, which manifested itself most strongly in the subgroup of 417 cores with non-zero mir143 and ERK5 immunoreactivity, or with only one of mir143 or ERK5 being zero (cc=0.2558 and P<0.0001). Mir143 neither correlate with Gleason scores or prostate-specific antigen levels, nor was it a predictor of disease-specific survival on univariate analysis. Conclusion: Although the mechanism for ERK5 activation in CaP remains to be fully elucidated, we have further validated the potential role of mir143 in regulating ERK5 levels in the clinical context. In addition, we demonstrate that the automated counting method for nuclear ERK5 is a clinically useful alterative to observer counting method in patient stratification in the context of ERK5 targeting therapy.
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Affiliation(s)
- I Ahmad
- Beatson Institute for Cancer Research, Bearsden, Glasgow G61 1BD, UK
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23
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Hetzl AC, Montico F, Lorencini RM, Kido L, Cândido E, Billis A, Ferreira U, Cagnon VH. Fibroblast growth factor, estrogen, and prolactin receptor features in different grades of prostatic adenocarcinoma in elderly men. Microsc Res Tech 2013; 76:321-30. [PMID: 23362007 DOI: 10.1002/jemt.22170] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Accepted: 12/18/2012] [Indexed: 11/07/2022]
Abstract
The objective was to characterize and associate the receptor reactivities of fibroblastic growth factor (FGF)-2, FGF-7, FGF-8, epidermal growth factor (EGF), α-actin and vimentin in relation to the androgen receptor (AR), α and β estrogen receptors (ERα and ERβ), and prolactin receptor in the prostate of elderly men showing low- and high-grade adenocarcinoma. Thirty prostatic samples were taken from 60- to 90-year-old patients without prostatic lesions and with low-grade cancer and high-grade cancer, from the University Hospital, School of Medicine, the State University of Campinas. The results showed that increased FGF-2, FGF-7, and FGF-8 receptor reactivities and decreased AR reactivity were verified in both high- and low-grade cancer. However, the FGF-8 receptor showed greater involvement at the beginning of the malignancy alterations. Increased EGF receptor (EGFR) reactivity and diminished α-actin immunohistochemistry were identified in both cancer groups. Also, increased ERα, PR, and vimentin receptors were verified in both cancer groups. To conclude, the ERα involvement in the reactive stroma activation led to a microenvironment, which was favorable to cancer progression, due to maximizing stromal imbalance. The prolactin could be related to cancer progression due to its interaction with ERα action, indicating that this hormone could be a relevant target to prevent the estrogenic effects in the prostatic lesions. Both FGF receptor (FGFR)-2 and FGFR-8 play a fundamental role in the early stages of prostate cancer, suggesting that these molecules could be a promising therapeutic target. The differential localization of the fibroblastic factors between the prostatic epithelium and stroma of elderly men, who presented prostate cancer, could indicate a favorable distinction for tumoral progression.
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Affiliation(s)
- Amanda Cia Hetzl
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, Brazil
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24
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Tarkkonen KM, Nilsson EM, Kähkönen TE, Dey JH, Heikkilä JE, Tuomela JM, Liu Q, Hynes NE, Härkönen PL. Differential roles of fibroblast growth factor receptors (FGFR) 1, 2 and 3 in the regulation of S115 breast cancer cell growth. PLoS One 2012. [PMID: 23185502 PMCID: PMC3503871 DOI: 10.1371/journal.pone.0049970] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Fibroblast growth factors (FGFs) regulate the growth and progression of breast cancer. FGF signaling is transduced through FGF receptors 1–4, which have oncogenic or anti-oncogenic roles depending on the ligand and the cellular context. Our aim was to clarify the roles of FGFR1–3 in breast cancer cell growth in vitro and in vivo. Pools of S115 mouse breast cancer cells expressing shRNA against FGFR1, 2 and 3 were created by lentiviral gene transfer, resulting in cells with downregulated expression of FGFR1, FGFR2 or FGFR3 (shR1, shR2 and shR3 cells, respectively) and shLacZ controls. FGFR1-silenced shR1 cells formed small, poorly vascularized tumors in nude mice. Silencing of FGFR2 in shR2 cells was associated with strong upregulation of FGFR1 expression and the formation of large, highly vascularized tumors compared to the control tumors. Silencing FGFR3 did not affect cell survival or tumor growth. Overexpressing FGFR2 in control cells did not affect FGFR1 expression, suggesting that high FGFR1 expression in shR2 cells and tumors was associated with FGFR2 silencing by indirect mechanisms. The expression of FGFR1 was, however, increased by the addition of FGF-8 to starved shLacZ or MCF-7 cells and decreased by the FGFR inhibitor PD173074 in shR2 cells with an elevated FGFR1 level. In conclusion, our results demonstrate that FGFR1 is crucial for S115 breast cancer cell proliferation and tumor growth and angiogenesis, whereas FGFR2 and FGFR3 are less critical for the growth of these cells. The results also suggest that the expression of FGFR1 itself is regulated by FGF-8 and FGF signaling, which may be of importance in breast tumors expressing FGFs at a high level.
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MESH Headings
- Animals
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Cell Line, Tumor/cytology
- Cell Line, Tumor/metabolism
- Cell Proliferation
- Female
- Fibroblast Growth Factor 8/metabolism
- Gene Expression Regulation, Neoplastic/drug effects
- Humans
- Mice
- Neoplasms, Experimental/genetics
- Neoplasms, Experimental/metabolism
- Pyrimidines/pharmacology
- Receptor, Fibroblast Growth Factor, Type 1/genetics
- Receptor, Fibroblast Growth Factor, Type 1/metabolism
- Receptor, Fibroblast Growth Factor, Type 2/genetics
- Receptor, Fibroblast Growth Factor, Type 2/metabolism
- Receptor, Fibroblast Growth Factor, Type 3/genetics
- Receptor, Fibroblast Growth Factor, Type 3/metabolism
- Signal Transduction
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Affiliation(s)
- Kati M Tarkkonen
- Institute of Biomedicine, Department of Cell Biology and Anatomy, University of Turku, Turku, Finland.
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25
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Elo T, Sipilä P, Valve E, Kujala P, Toppari J, Poutanen M, Härkönen P. Fibroblast Growth Factor 8b Causes Progressive Stromal and Epithelial Changes in the Epididymis and Degeneration of the Seminiferous Epithelium in the Testis of Transgenic Mice1. Biol Reprod 2012; 86:157, 1-12. [DOI: 10.1095/biolreprod.111.097352] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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Abstract
Polyunsaturated fatty acids (PUFA) play important roles in the normal physiology and in pathological states including inflammation and cancer. While much is known about the biosynthesis and biological activities of eicosanoids derived from ω6 PUFA, our understanding of the corresponding ω3 series lipid mediators is still rudimentary. The purpose of this review is not to offer a comprehensive summary of the literature on fatty acids in prostate cancer but rather to highlight some of the areas where key questions remain to be addressed. These include substrate preference and polymorphic variants of enzymes involved in the metabolism of PUFA, the relationship between de novo lipid synthesis and dietary lipid metabolism pathways, the contribution of cyclooxygenases and lipoxygenases as well as terminal synthases and prostanoid receptors in prostate cancer, and the potential role of PUFA in angiogenesis and cell surface receptor signaling.
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27
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Valencia T, Joseph A, Kachroo N, Darby S, Meakin S, Gnanapragasam VJ. Role and expression of FRS2 and FRS3 in prostate cancer. BMC Cancer 2011; 11:484. [PMID: 22078327 PMCID: PMC3231952 DOI: 10.1186/1471-2407-11-484] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 11/11/2011] [Indexed: 12/25/2022] Open
Abstract
Background FGF receptor substrates (FRS2 and FRS3) are key adaptor proteins that mediate FGF-FGFR signalling in benign as well as malignant tissue. Here we investigated FRS2 and FRS3 as a means of disrupting global FGF signalling in prostate cancer. Methods FRS2 and FRS3 manipulation was investigated in vitro using over-expression, knockdown and functional assays. FRS2 and FRS3 expression was profiled in cell lines and clinical tumors of different grades. Results In a panel of cell lines we observed ubiquitous FRS2 and FRS3 transcript and protein expression in both benign and malignant cells. We next tested functional redundancy of FRS2 and FRS3 in prostate cancer cells. In DU145 cells, specific FRS2 suppression inhibited FGF induced signalling. This effect was not apparent in cells stably over-expressing FRS3. Indeed FRS3 over-expression resulted in enhanced proliferation (p = 0.005) compared to control cells. Given this functional redundancy, we tested the therapeutic principle of dual targeting of FRS2 and FRS3 in prostate cancer. Co-suppression of FRS2 and FRS3 significantly inhibited ERK activation with a concomitant reduction in cell proliferation (p < 0.05), migration and invasion (p < 0.05). Synchronous knockdown of FRS2 and FRS3 with exposure to cytotoxic irradiation resulted in a significant reduction in prostate cancer cell survival compared to irradiation alone (p < 0.05). Importantly, this synergistic effect was not observed in benign cells. Finally, we investigated expression of FRS2 and FRS3 transcript in a cohort of micro-dissected tumors of different grades as well as by immunohistochemistry in clinical biopsies. Here, we did not observe any difference in expression between benign and malignant biopsies. Conclusions These results suggest functional overlap of FRS2 and FRS3 in mediating mitogenic FGF signalling in the prostate. FRS2 and FRS3 are not over-expressed in tumours but targeted dual inhibition may selectively adversely affect malignant but not benign prostate cells.
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Affiliation(s)
- Tania Valencia
- Translational Prostate Cancer Group, Department of Oncology, Hutchison/MRC research centre, University of Cambridge, Cambridge, UK
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28
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Stromal activation associated with development of prostate cancer in prostate-targeted fibroblast growth factor 8b transgenic mice. Neoplasia 2011; 12:915-27. [PMID: 21076617 DOI: 10.1593/neo.10776] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Revised: 07/16/2010] [Accepted: 07/19/2010] [Indexed: 11/18/2022]
Abstract
Expression of fibroblast growth factor 8 (FGF-8) is commonly increased in prostate cancer. Experimental studies have provided evidence that it plays a role in prostate tumorigenesis and tumor progression. To study how increased FGF-8 affects the prostate, we generated and analyzed transgenic (TG) mice expressing FGF-8b under the probasin promoter that targets expression to prostate epithelium. Prostates of the TG mice showed an increased size and changes in stromal and epithelial morphology progressing from atypia and prostatic intraepithelial neoplasia (mouse PIN, mPIN) lesions to tumors with highly variable phenotype bearing features of adenocarcinoma, carcinosarcoma, and sarcoma. The development of mPIN lesions was preceded by formation of activated stroma containing increased proportion of fibroblastic cells, rich vasculature, and inflammation. The association between advancing stromal and epithelial alterations was statistically significant. Microarray analysis and validation with quantitative polymerase chain reaction revealed that expression of osteopontin and connective tissue growth factor was markedly upregulated in TG mouse prostates compared with wild type prostates. Androgen receptor staining was decreased in transformed epithelium and in hypercellular stroma but strongly increased in the sarcoma-like lesions. In conclusion, our data demonstrate that disruption of FGF signaling pathways by increased epithelial production of FGF-8b leads to strongly activated and atypical stroma, which precedes development of mPIN lesions and prostate cancer with mixed features of adenocarcinoma and sarcoma in the prostates of TG mice. The results suggest that increased FGF-8 in human prostate may also contribute to prostate tumorigenesis by stromal activation.
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29
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Abstract
Background: Aberrant mitogen/extracellular signal-regulated kinase 5 (MEK5)–extracellular signal-regulated protein kinase 5 (ERK5)-mediated signalling has been implicated in a number of tumour types including prostate cancer (PCa). The molecular basis of ERK5-driven carcinogenesis and its clinical relevance remain to be fully characterised. Methods: Modulation of ERK5 expression or function in human PCa PC3 and PC3–ERK5 (stably transfected with ERK5) cells was performed using siRNA-mediated knockdown or the MEK inhibitor PD18435 respectively. In vitro significance of ERK5 signalling was assessed by assays for proliferation, motility, invasion and invadopodia. Expression of matrix metalloproteinases/tissue inhibitors of metalloproteases was determined by Q-RT–PCR. Extracellular signal-regulated protein kinase 5 expression in primary and metastatic PCa was examined using immunohistochemistry. Results: Reduction of ERK5 expression or signalling significantly inhibited the motility and invasive capability of PC3 cells. Extracellular signal-regulated protein kinase 5-mediated signalling significantly promoted formation of in vivo metastasis in an orthotopic PCa model (P<0.05). Invadopodia formation was also enhanced by forced ERK5 expression in PC3 cells. Furthermore, in metastatic PCa, nuclear ERK5 immunoreactivity was significantly upregulated when compared with benign prostatic hyperplasia and primary PCa (P=0.013 and P<0.0001, respectively). Conclusion: Our in vitro, in vivo and clinical data support an important role for the MEK5–ERK5 signalling pathway in invasive PCa, which represents a potential target for therapy in primary and metastatic PCa.
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Lui VWY, Yau DMS, Cheung CSF, Wong SCC, Chan AKC, Zhou Q, Wong EYL, Lau CPY, Lam EKY, Hui EP, Hong B, Hui CWC, Chan ASK, Ng PKS, Ng YK, Lo KW, Tsang CM, Tsui SKW, Tsao SW, Chan ATC. FGF8b oncogene mediates proliferation and invasion of Epstein–Barr virus-associated nasopharyngeal carcinoma cells: implication for viral-mediated FGF8b upregulation. Oncogene 2010; 30:1518-30. [DOI: 10.1038/onc.2010.529] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Tuomela J, Grönroos TJ, Valta MP, Sandholm J, Schrey A, Seppänen J, Marjamäki P, Forsback S, Kinnunen I, Solin O, Minn H, Härkönen PL. Fast growth associated with aberrant vasculature and hypoxia in fibroblast growth factor 8b (FGF8b) over-expressing PC-3 prostate tumour xenografts. BMC Cancer 2010; 10:596. [PMID: 21034500 PMCID: PMC2984431 DOI: 10.1186/1471-2407-10-596] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Accepted: 10/30/2010] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Prostate tumours are commonly poorly oxygenated which is associated with tumour progression and development of resistance to chemotherapeutic drugs and radiotherapy. Fibroblast growth factor 8b (FGF8b) is a mitogenic and angiogenic factor, which is expressed at an increased level in human prostate tumours and is associated with a poor prognosis. We studied the effect of FGF8b on tumour oxygenation and growth parameters in xenografts in comparison with vascular endothelial growth factor (VEGF)-expressing xenografts, representing another fast growing and angiogenic tumour model. METHODS Subcutaneous tumours of PC-3 cells transfected with FGF8b, VEGF or empty (mock) vectors were produced and studied for vascularity, cell proliferation, glucose metabolism and oxygenation. Tumours were evaluated by immunohistochemistry (IHC), flow cytometry, use of radiolabelled markers of energy metabolism ([18F]FDG) and hypoxia ([18F]EF5), and intratumoral polarographic measurements of pO2. RESULTS Both FGF8b and VEGF tumours grew rapidly in nude mice and showed highly vascularised morphology. Perfusion studies, pO2 measurements, [18F]EF5 and [18F]FDG uptake as well as IHC staining for glucose transport protein (GLUT1) and hypoxia inducible factor (HIF) 1 showed that VEGF xenografts were well-perfused and oxygenised, as expected, whereas FGF8b tumours were as hypoxic as mock tumours. These results suggest that FGF8b-induced tumour capillaries are defective. Nevertheless, the growth rate of hypoxic FGF8b tumours was highly increased, as that of well-oxygenised VEGF tumours, when compared with hypoxic mock tumour controls. CONCLUSION FGF8b is able to induce fast growth in strongly hypoxic tumour microenvironment whereas VEGF-stimulated growth advantage is associated with improved perfusion and oxygenation of prostate tumour xenografts.
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Affiliation(s)
- Johanna Tuomela
- Institute of Biomedicine, Department of Cell Biology and Anatomy, University of Turku, Turku, Finland.
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Restuccia DF, Hemmings BA. From man to mouse and back again: advances in defining tumor AKTivities in vivo. Dis Model Mech 2010; 3:705-20. [PMID: 20940316 DOI: 10.1242/dmm.004671] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
AKT hyperactivation is a common event in human cancers, and inhibition of oncogenic AKT activation is a major goal of drug discovery programs. Mouse tumor models that replicate AKT activation typical of human cancers provide a powerful means by which to investigate mechanisms of oncogenic signaling, identify potential therapeutic targets and determine treatment regimes with maximal therapeutic efficacy. This Perspective highlights recent advances using in vivo studies that reveal how AKT signaling supports tumor formation, cooperates with other mutations to promote tumor progression and facilitates tumor-cell dissemination, focusing on well-characterized prostate carcinoma mouse models that are highly sensitive to AKT activation. The implications of these findings on the therapeutic targeting of AKT and potential new drug targets are also explored.
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Affiliation(s)
- David F Restuccia
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland.
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Tarkkonen K, Ruohola J, Härkönen P. Fibroblast growth factor 8 induced downregulation of thrombospondin 1 is mediated by the MEK/ERK and PI3K pathways in breast cancer cells. Growth Factors 2010; 28:256-67. [PMID: 20370578 DOI: 10.3109/08977191003745480] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Expression of fibroblast growth factor 8 (FGF-8) is increased in several forms of hormonal cancer. It was previously shown to regulate expression of thrombospondin 1 (TSP-1), an inhibitor of angiogenesis, in S115 breast cancer cells. Here, we studied the FGF-8-activated signalling pathways mediating TSP-1 repression in S115 cells and in non-tumorigenic MCF10A cells. Inhibition of FGF receptors or of MEK1/2 and PI3K with specific inhibitors (PD173074, U0126 or LY294002, respectively) restored TSP-1 mRNA expression in the presence of FGF-8 in S115 cells. Furthermore, U0126 and LY294002 increased TSP-1 mRNA expression in S115 cells over-expressing FGF-8. In MCF10A cells, FGF-8 treatment also decreased TSP-1 expression and the effect was dependent on active MEK1/2. In conclusion, FGF-8 suppresses TSP-1 expression through two independent pathways, MEK1/2 and PI3K. Repression of TSP-1 may be an important mechanism involved in induction of an angiogenic phenotype and growth of FGF-8-expressing breast cancer.
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Affiliation(s)
- Kati Tarkkonen
- Department of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, 20520, Turku, Finland.
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Murphy T, Darby S, Mathers ME, Gnanapragasam VJ. Evidence for distinct alterations in the FGF axis in prostate cancer progression to an aggressive clinical phenotype. J Pathol 2010; 220:452-60. [PMID: 19960500 DOI: 10.1002/path.2657] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Multiple fibroblast growth factor (FGF) axis alterations are known to occur in prostate cancer. Here we simultaneously profiled key components of this axis to determine their relevance in disease progression. An optimized immunohistochemistry protocol was used in expression analysis of FGF2, FGF8, FGFR1, FGFR4, and Sef (similar expression to FGF) in a single TMA of prostate cancer. FGF ligands and receptors were overexpressed in cancers compared to benign samples (p < 0.0001), while Sef expression was reduced (p < 0.0001). There was a positive association between higher grades and increased FGFR4 (p = 0.02), FGF2, and FGF8 (p = 0.002 and p < 0.0001). Sef expression was progressively lower with increasing grade (p = 0.005). Clinical stage was positively associated with FGF2, FGF8, and FGFR4 expression (p = 0.005, 0.03, and 0.012) but not with FGFR1 or Sef expression. Only reduced Sef was associated with bone metastasis (p = 0.02) and was also predictive of subsequent metastasis in initially localized tumours (p = 0.004). Down-regulation of Sef and increased FGFR4 were also the only independent variables associated with disease-specific survival (HR 1.73, p = 0.04 and HR 0.56, p = 0.01). In in vitro studies, silencing Sef enhanced the cell response to FGFs (p < 0.001) and substantially mitigated the effectiveness of an FGFR1 inhibitor. Conversely, increased Sef blocked the response to FGFs and had a comparable suppressive effect to the inhibitor. This study demonstrates that increased FGFR4 and reduced Sef may be critical FGF alterations associated with prostate cancer progression. Sef may also have a role in the tumour response to FGFR inhibition and warrants further investigation in this context.
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Affiliation(s)
- Tania Murphy
- Translational Prostate Cancer Group, Hutchison MRC Research Centre, University of Cambridge, Cambridge, CB2 0QQ, UK
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Similar expression to FGF (Sef) inhibits fibroblast growth factor-induced tumourigenic behaviour in prostate cancer cells and is downregulated in aggressive clinical disease. Br J Cancer 2009; 101:1891-9. [PMID: 19888221 PMCID: PMC2788253 DOI: 10.1038/sj.bjc.6605379] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background: The fibroblast growth factor (FGF) axis is an important mitogenic stimulus in prostate carcinogenesis. We have previously reported that transcript level of human similar expression to FGF (hSef), a key regulator of this pathway, is downregulated in clinical prostate cancer. In this study we further analysed the role of hSef in prostate cancer. Methods: hSef function was studied in in vitro and in vivo prostate cancer models using stable over-expression clones. Protein expression of hSef was studied in a comprehensive tissue microarray. Results: Stable over-expression of hSef resulted in reduced in vitro cancer cell proliferation, migration and invasive potential. In an in vivo xenograft model, the expression of hSef significantly retarded prostate tumour growth as compared with empty vector (P=0.03) and non-transfected (P=0.0001) controls. Histological examination further showed a less invasive tumour phenotype and reduced numbers of proliferating cells (P=0.0002). In signalling studies, hSef inhibited FGF-induced ERK phosphorylation, migration to the nucleus and activation of a reporter gene. Constitutively active Ras, however, was able to reverse these effects, suggesting that hSef exerts an effect either above or at the level of Ras in prostate cancer cells. In a large tissue microarray, we observed a significant loss of hSef protein in high-grade (P<0.0001) and metastatic (P<0.0001) prostate cancer. Conclusions: Considered together, the role of hSef in attenuating FGF signalling and evidence of downregulation in advanced tumours argue strongly for a tumour suppressor function in human prostate cancer.
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Valta MP, Tuomela J, Vuorikoski H, Loponen N, Väänänen RM, Pettersson K, Väänänen HK, Härkönen PL. FGF-8b induces growth and rich vascularization in an orthotopic PC-3 model of prostate cancer. J Cell Biochem 2009; 107:769-84. [PMID: 19415685 DOI: 10.1002/jcb.22175] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Fibroblast growth factor 8 (FGF-8) is expressed at an increased level in a high proportion of prostate cancers and it is associated with a poor prognosis of the disease. Our aim was to study the effects of FGF-8b on proliferation of PC-3 prostate cancer cells and growth of PC-3 tumors, and to identify FGF-8b-associated molecular targets. Expression of ectopic FGF-8b in PC-3 cells caused a 1.5-fold increase in cell proliferation in vitro and a four- to fivefold increase in the size of subcutaneous and orthotopic prostate tumors in nude mice. Tumors expressing FGF-8b showed a characteristic morphology with a very rich network of capillaries. This was associated with increased spread of the cancer cells to the lungs as measured by RT-qPCR of FGF-8b mRNA. Microarray analyses revealed significantly altered, up- and downregulated, genes in PC-3 cell cultures (169 genes) and in orthotopic PC-3 tumors (61 genes). IPA network analysis of the upregulated genes showed the strongest association with development, cell proliferation (CRIP1, SHC1), angiogenesis (CCL2, DDAH2), bone metastasis (SPP1), cell-to-cell signaling and energy production, and the downregulated genes associated with differentiation (DKK-1, VDR) and cell death (CYCS). The changes in gene expression were confirmed by RT-qPCR. In conclusion, our results demonstrate that FGF-8b increases the growth and angiogenesis of orthotopic prostate tumors. The associated gene expression signature suggests potential mediators for FGF-8b actions on prostate cancer progression and metastasis.
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Affiliation(s)
- Maija P Valta
- Department of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Finland.
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Rajan P, Elliott DJ, Robson CN, Leung HY. Alternative splicing and biological heterogeneity in prostate cancer. Nat Rev Urol 2009; 6:454-60. [DOI: 10.1038/nrurol.2009.125] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gnanapragasam VJ. Unlocking the molecular archive: the emerging use of formalin-fixed paraffin-embedded tissue for biomarker research in urological cancer. BJU Int 2009; 105:274-8. [PMID: 19519763 DOI: 10.1111/j.1464-410x.2009.08665.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Rapid developments have been made in identifying predictive and prognostic markers in urological cancers. Most biomarker profiling has been primarily conducted in fresh-frozen tissue taken at the time of diagnosis or surgery. The disadvantage of this process is that the sampled tissue might not be entirely representative of the tumour and there is a lack of adequate numbers and follow-up to make clear conclusions as to a biomarker's prognostic potential. Formalin fixation and paraffin embedding (FFPE) is the clinical standard for preparing samples for histopathological assessment; this preserves tissue architecture and allows the storage of diagnostic and surplus tissue in archival banks. This resource represents a vast repository of tissue material with a long-term clinical follow-up. With the advent of high-throughput profiling technologies, there is a unique opportunity to screen and comprehensively evaluate many biomarkers. Such studies require the large sample numbers and outcome data which is a key feature of archival FFPE tissue. However, the process of FFPE induces chemical changes and degradation in tissue DNA, RNA and protein, which can make subsequent analysis unreliable. Recently, several technical advances have been made to overcome the degrading effects of FFPE. This review highlights the key advances that are beginning to allow the use of FFPE archives for molecular biomarker profiling.
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Affiliation(s)
- Vincent J Gnanapragasam
- Uro-oncology Group, Department of Oncology, Hutchison MRC Research Centre, University of Cambridge, UK.
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Abstract
Fibroblast growth factor receptors (FGFRs) comprise a subfamily of receptor tyrosine kinases (RTKs) that are master regulators of a broad spectrum of cellular and developmental processes, including apoptosis, proliferation, migration and angiogenesis. Due to their broad impact, FGFRs and other RTKs are highly regulated and normally only basally active. Deregulation of FGFR signaling by activating mutations or ligand/receptor overexpression could allow these receptors to become constitutively active, leading to cancer development, including both hematopoietic and solid tumors, such as breast, bladder and prostate carcinomas. In this review, we focus on potential modes of FGFR-mediated tumorigenesis, in particular, the role of FGFR1 during prostate cancer progression.
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Affiliation(s)
- Victor D Acevedo
- Program in Cell and Molecular Biology, Department of Immunology, Baylor College of Medicine, Houston, Texas 77030, USA
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Ariztia EV, Lee CJ, Gogoi R, Fishman DA. The Tumor Microenvironment: Key to Early Detection. Crit Rev Clin Lab Sci 2008; 43:393-425. [PMID: 17050079 DOI: 10.1080/10408360600778836] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The tumor microenvironment plays an important role equal to the tumor cell population in the progression of cancer. Consisting of stromal fibroblasts, inflammatory cells, components of the vasculature, normal epithelia, and extracellular matrix, the surrounding environment interacts or "cross-talks" with tumor cells through the release of growth factors, cytokines, proteases, and other bioactive molecules. Tumor growth, formation of new vascular networks, evasion of the host immune system, and invasion and metastasis are processes that co-evolve and become finely optimized and regulated within the tumor microenvironment. However, relatively recent reports on three areas of study have come together to add new levels of complexity to the tumor microenvironment. These include ectodomain shedding of proteins, shedding of membrane-derived vesicles, and novel roles for phospholipids. These dynamic changes that take place in the tumor microenvironment provide new avenues for study and for the early detection of cancer, whereas proteomic technologies provide the means to detect these unique proteins and lipids. Here we review the evolving concepts of the tumor microenvironment that, together with advances in proteomic technologies, hold the promise to facilitate the detection of early-stage cancer.
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Affiliation(s)
- Edgardo V Ariztia
- Department of Obstetrics and Gynecology, New York University School of Medicine, New York, NY 10016, USA
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Maruyama-Takahashi K, Shimada N, Imada T, Maekawa-Tokuda Y, Ishii T, Ouchi J, Kusaka H, Miyaji H, Akinaga S, Tanaka A, Shitara K. A neutralizing anti-fibroblast growth factor (FGF) 8 monoclonal antibody shows anti-tumor activity against FGF8b-expressing LNCaP xenografts in androgen-dependent and -independent conditions. Prostate 2008; 68:640-50. [PMID: 18213631 DOI: 10.1002/pros.20728] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Fibroblast growth factor 8-isoform b (FGF8b) has been detected in human clinical sex-organ related cancers including hormone-refractory prostate cancer. There are, however, few relevant experimental models. A murine monoclonal anti-FGF8 antibody, KM1334, has been shown to neutralize FGF8b and inhibit the growth of androgen-dependent mouse mammary SC-3 cells in vitro and in vivo. In the present study, we evaluated the anti-tumor activity of KM1334 against androgen-dependent and -independent progression of FGF8b-expressing human prostate cancer xenografts. METHODS FGF8b cDNA was transfected into androgen-dependent human prostate cancer cell line LNCaP, and its xenograft tumors were established subcutaneously in SCID mice with or without castration. KM1334 at the dose of 400 microg/head was injected twice weekly. RESULTS FGF8b-expressing LNCaP cells secreted FGF8b, showed enhanced level of Erk1/2 phosphorylation, and showed more potent growth properties than mock-expressing cells in vitro and in vivo. KM1334 reduced these properties in vitro, inhibited tumorigenecity in vivo (T/C=0.33), and showed anti-tumor activity against established tumors (T/C=0.47) of FGF8b-expressing cells. FGF8b-expressing LNCaP tumors were androgen-dependent. However, they recurred as androgen-independent FGF8b positive tumors after castration. KM1334 also inhibited the growth of established FGF8b-expressing tumors in the androgen-independent states (T/C=0.47). CONCLUSIONS These results indicate that humanized monoclonal antibodies, conserving the paratope of KM1334, are a promising candidate for therapy of FGF8b-expressing clinical prostate cancers. Follow-up studies using xenograft models with clinical FGF8b-expressing tumors are required to validate these early findings.
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Affiliation(s)
- Kumiko Maruyama-Takahashi
- Antibody Research Laboratories, Pharmaceutical Research Center, Kyowa Hakko Kogyo Co., Chiyoda-ku, Tokyo, Japan
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Rogerson L, Darby S, Jabbar T, Mathers ME, Leung HY, Robson CN, Sahadevan K, O'Toole K, Gnanapragasam VJ. Application of transcript profiling in formalin-fixed paraffin-embedded diagnostic prostate cancer needle biopsies. BJU Int 2008; 102:364-70. [PMID: 18410440 DOI: 10.1111/j.1464-410x.2008.07627.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
OBJECTIVE To investigate the feasibility of transcript profiling in diagnostic formalin-fixed and paraffin-embedded (FFPE) biopsies for prostate cancer. MATERIALS AND METHODS Laser-capture microdissection (LCM) was used to microdissect glandular epithelium as well as stromal tissue in archival prostate needle biopsies. Optimized RNA extraction, reverse transcription and real-time PCR (QPCR) protocols were used to detect transcript expression. RNA degradation effects were assessed using hydrolysed cell line RNA and matched xenograft FFPE and frozen tumours. RESULTS LCM and RNA extraction was achieved in all biopsies from a pilot cohort of five patients. cDNA produced was successfully used to detect expression of glyceraldehyde-3-phosphate dehydrogenase, RPL13, prostate-specific antigen, vimentin, inhibitor of differentiation/DNA binding 1 (Id-1) and polycomb group protein enhancer of zeste homolog 2 (EZH2) transcripts. In the cell line and xenograft models, we investigated the effect of RNA degradation on transcript quantification by QPCR. In both models normalization of transcript quantity with a housekeeping gene resulted in restored expression in all degraded samples to within a 50% difference of control samples. Using an extended cohort of 29 biopsies, we tested application in detecting differences in EZH2 and Id-1 expression between malignant and benign epithelium. The results confirmed that our technique was capable of quantifying significant differences in expression between malignant and benign epithelium consistent with the reported trends. CONCLUSION This study reports the use of standard FFPE needle biopsies for transcript profiling and supports the concept of molecular prognostic studies in tissue acquired at diagnosis in prostate cancer.
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Affiliation(s)
- Lynsey Rogerson
- Nothern Institute for Cancer Research, University of Newcastle, Newcastle upon Tyne, UK
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Potula HHSK, Kathuria SR, Ghosh AK, Maiti TK, Dey S. Transient expression, purification and characterization of bioactive human fibroblast growth factor 8b in tobacco plants. Transgenic Res 2008; 17:19-32. [PMID: 17265164 DOI: 10.1007/s11248-007-9072-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2006] [Accepted: 01/10/2007] [Indexed: 11/26/2022]
Abstract
cDNA of human fibroblast growth factor 8 isoform b (FGF8b) was cloned for the first time into a plant expression vector with or without endoplasmic reticulum retention signal (KDEL) and was transiently expressed as His tagged fusion protein in Nicotiana tabacum leaves through Agrobacterium mediated gene transfer by vacuum infiltration method. Expression of FGF8b was confirmed by ELISA and Western blot using anti-FGF8b antibody and the expression level was measured as 4.1% of total soluble protein of tobacco leaves. The expressed recombinant protein was purified by Ni-NTA affinity chromatography and its molecular weight was determined by MALDI-TOF-MS. Schiff's test, Concanavalin A (Con A) immunoblot and enzymatic deglycosylation indicated that the high molecular mass was due to glycosylation of the FGF8b expressed in plant cells. Measurement of its biological activity in NIH3T3 cells by thymidine incorporation and MTT assay showed induction of cell proliferation. These results indicate that biologically active recombinant FGF8b could be expressed in tobacco plants.
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Valta MP, Tuomela J, Bjartell A, Valve E, Väänänen HK, Härkönen P. FGF-8 is involved in bone metastasis of prostate cancer. Int J Cancer 2008; 123:22-31. [DOI: 10.1002/ijc.23422] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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45
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McCracken SRC, Ramsay A, Heer R, Mathers ME, Jenkins BL, Edwards J, Robson CN, Marquez R, Cohen P, Leung HY. Aberrant expression of extracellular signal-regulated kinase 5 in human prostate cancer. Oncogene 2007; 27:2978-88. [PMID: 18071319 DOI: 10.1038/sj.onc.1210963] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Abnormal intracellular signaling contributes to carcinogenesis and may represent novel therapeutic targets. mitogen/extracellular signal-regulated kinase kinase-5 (MEK5) overexpression is associated with aggressive prostate cancer. In this study, we examined the role of extracellular signal-regulated kinase (ERK5, an MAPK and specific substrate for MEK5) in prostate cancer. ERK5 immunoreactivity was significantly upregulated in high-grade prostate cancer when compared to benign prostatic hyperplasia (P<0.0001). Increased ERK5 cytoplasmic signals correlated closely with Gleason sum score (P<0.0001), bony metastases (P=0.0044) and locally advanced disease at diagnosis (P=0.0023), with a weak association with shorter disease-specific survival (P=0.036). A subgroup of patients showed strong nuclear ERK5 localization, which correlated with poor disease-specific survival and, on multivariant analysis, was an independent prognostic factor (P<0.0001). Analysis of ERK5 expression in matched tumor pairs (before and after hormone relapse, n=26) revealed ERK5 nuclear expression was significantly associated with hormone-insensitive disease (P=0.0078). Similarly, ERK5 protein expression was increased in an androgen-independent LNCaP subline. We obtained the following in vitro and in vivo evidence to support the above expression data: (1) cotransfection of ERK5wt and MEK5D constructs in PC3 cells results in predominant ERK5 nuclear localization, similar to that observed in aggressive clinical disease; (2) ERK5-overexpressing PC3 cells have enhanced proliferative, migrative and invasive capabilities in vitro (P<0.0001), and were dramatically more efficient in forming tumors, with a shorter mean time for tumors to reach a critical volume of 1000 mm(3), in vivo (P<0.0001); (3) the MEK1 inhibitor, PD184352, blocking ERK1/2 activation at low dose, did not suppress proliferation but did significantly decrease proliferation at a higher dose required to inhibit ERK5 activation. Taken together, our results establish the potential importance of ERK5 in aggressive prostate cancer.
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Affiliation(s)
- S R C McCracken
- Urology Research Group, Northern Institute for Cancer Research, University of Newcastle, Tyne and Wear, UK
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46
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Sahadevan K, Darby S, Leung HY, Mathers ME, Robson CN, Gnanapragasam VJ. Selective over-expression of fibroblast growth factor receptors 1 and 4 in clinical prostate cancer. J Pathol 2007; 213:82-90. [PMID: 17607666 DOI: 10.1002/path.2205] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fibroblast growth factor receptors (FGFRs) mediate the tumourigenic effects of FGFs in prostate cancer. These receptors are therefore potential therapeutic targets in the development of inhibitors to this pathway. To identify the most relevant targets, we simultaneously investigated FGFR1-4 expression using a prostate cancer tissue microarray (TMA) and in laser capture microdissected (LCM) prostate epithelial cells. In malignant prostates (n = 138) we observed significant FGFR1 and FGFR4 protein over-expression in comparison with benign prostates (n = 58; p < 0.0001). FGFR1 was expressed at high levels in the majority of tumours (69% of grade 3 or less, 74% of grade 4 and 70% of grade 5), while FGFR4 was strongly expressed in 83% of grade 5 cancers but in only 25% of grade 1-3 cancers (p < 0.0001). At the transcript level we observed a similar pattern, with FGFR1 and FGFR4 mRNA over-expressed in malignant epithelial cells compared to benign cells (p < 0.0005 and p < 0.05, respectively). While total FGFR2 was increased in some cancers, there was no association between expression and tumour grade or stage. Transcript analysis, however, revealed a switch in the predominant isoform expressed from FGFR2IIIb to FGFR2IIIc among malignant epithelial cells. In contrast, protein and transcript expression of FGFR3 was very similar between benign and cancer biopsies. The functional effect of targeting FGFR4 in prostate cancer cells has not previously been investigated. In in vitro experiments, suppression of FGFR4 by RNA interference effectively blocked prostate cancer cell proliferation (p < 0.0001) and invasion (p < 0.001) in response to exogenous stimulation. This effect was evident regardless of whether the cells expressed the FGFR4 Arg388 or Gly388 allele. In parallel experiments, FGFR3 suppression had no discernible effect on cancer cell behaviour. These results suggest evidence of selective over-expression of FGFR1 and FGFR4 in clinical prostate cancer and support the notion of targeted inhibition of these receptors to disrupt FGF signalling.
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MESH Headings
- Case-Control Studies
- Cell Line, Tumor
- Cell Proliferation
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Humans
- Immunohistochemistry
- Male
- Microdissection
- Microscopy, Confocal
- Oligonucleotide Array Sequence Analysis
- Polymorphism, Single Nucleotide
- Prostatic Neoplasms/genetics
- Prostatic Neoplasms/metabolism
- Protein Isoforms/genetics
- RNA Interference
- RNA, Small Interfering/pharmacology
- Receptor, Fibroblast Growth Factor, Type 1/analysis
- Receptor, Fibroblast Growth Factor, Type 1/genetics
- Receptor, Fibroblast Growth Factor, Type 1/metabolism
- Receptor, Fibroblast Growth Factor, Type 2/analysis
- Receptor, Fibroblast Growth Factor, Type 2/genetics
- Receptor, Fibroblast Growth Factor, Type 2/metabolism
- Receptor, Fibroblast Growth Factor, Type 3/analysis
- Receptor, Fibroblast Growth Factor, Type 3/genetics
- Receptor, Fibroblast Growth Factor, Type 3/metabolism
- Receptor, Fibroblast Growth Factor, Type 4/analysis
- Receptor, Fibroblast Growth Factor, Type 4/genetics
- Receptor, Fibroblast Growth Factor, Type 4/metabolism
- Receptors, Fibroblast Growth Factor/analysis
- Receptors, Fibroblast Growth Factor/genetics
- Receptors, Fibroblast Growth Factor/metabolism
- Transcription, Genetic
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Affiliation(s)
- K Sahadevan
- Urology Research Group, Northern Institute for Cancer Research, Medical School, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
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47
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Hsieh AC, Small EJ, Ryan CJ. Androgen-response elements in hormone-refractory prostate cancer: implications for treatment development. Lancet Oncol 2007; 8:933-9. [PMID: 17913662 DOI: 10.1016/s1470-2045(07)70316-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Many attempts have been made to derive genetic signatures for progressive prostate cancer for both prognostic and therapeutic purposes. These investigations have resulted in the discovery of many pathways, but the signatures exhibit heterogeneity and restricted reproducibility. A thorough and disciplined analysis of genes with androgen-response elements that are expressed in progressive, castration-resistant prostate cancer is an integral step towards the development of new therapeutic or diagnostic targets. We discuss the effects of bona-fide downstream targets of the androgen receptor on cellular proliferation, evasion of apoptosis, and angiogenesis, and consider the clinical potential of these targets.
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Affiliation(s)
- Andrew C Hsieh
- Department of Medicine, and UCSF Comprehensive Cancer Center, University of California-San Francisco, 94143, USA.
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48
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Haworth KE, Healy C, McGonnell IM, Binns M, Sharpe PT. Characterisation of the genomic canine Fgf8 locus and screen for genetic variants in 4 dogs with different face types. ACTA ACUST UNITED AC 2007; 18:209-19. [PMID: 17454006 DOI: 10.1080/10425170600986654] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We are investigating the genetic basis of morphological differences in skull shape between domestic dogs of different breeds using a candidate gene approach to identify genes involved in the genetic regulation. One such candidate is Fgf8. Fgf8 is a signalling molecule important in the embryonic development and patterning of the craniofacial region. Mice conditional null for the expression of Fgf8 after E9.5 have a short foreface and a wide skull (Trumpp et al. 1999). Using a combination of bioinformatics and PCR cloning, we have characterised the genomic loci of the canine Fgf8 gene. Like the mouse homologue, it is composed of six exons and we also predict that like the mouse, there are eight alternative isoforms that are generated by alternative splicing events. We have identified a short 200 bp sequence upstream of the Fgf8 gene that is highly conserved between species and have predicted putative transcription factor binding sites using the Transfac database. Genetic analysis of 4 dogs with different skull types identified genetic variation. None of the variants however, were predicted to have any functional significance.
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Affiliation(s)
- Kim E Haworth
- Department of Craniofacial Development, King's College, Dental Institute, Guy's Hospital, London Bridge, London, SE1 9RT, UK
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49
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Dudderidge TJ, McCracken SR, Loddo M, Fanshawe TR, Kelly JD, Neal DE, Leung HY, Williams GH, Stoeber K. Mitogenic growth signalling, DNA replication licensing, and survival are linked in prostate cancer. Br J Cancer 2007; 96:1384-93. [PMID: 17406359 PMCID: PMC2360172 DOI: 10.1038/sj.bjc.6603718] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Activation of mitogen/extracellular-signal-regulated kinase kinase 5/extracellular signal-regulated kinase-5 (MEK5/ERK5) growth signalling is coupled to increased cell proliferation in prostate cancer (PCa). Dysregulation of the DNA replication licensing pathway, a critical step in growth control downstream of transduction signalling pathways, is associated with development of PCa. In this study we have investigated linkages between the MEK5/ERK5 pathway and DNA replication licensing during prostate carcinogenesis. The effects of increased MEK5/ERK5 signalling on the expression of replication licensing factors Mcm2 and geminin and the proliferation marker Ki67 were studied in an ecdysone-inducible system expressing a constitutively activated mutant of MEK5 in EcR293 cells and in stable ERK5 over-expressing PC3 clones. In parallel, expression of these biomarkers in PCa biopsy specimens (n=58) was studied and compared to clinicopathological parameters. In both in vitro systems induction of MEK5 expression resulted in increased levels of phosphorylated ERK5 and Mcm2, geminin and Ki67 proteins. In PCa specimens average Mcm2 expression was greater than Ki67 and geminin expression (median labelling index (LI) 36.7, 18.1, and 3.4% respectively), consistent with their differential expression according to growth status (P<0.0001). Mcm2, geminin and Ki67 expression were significantly associated with Gleason grade (P=0.0002, P=0.0003, P=0.004); however there was no link with T or M stage. There was a significant relationship between increasing ERK5 expression and increasing Mcm2 (P=0.003) and Ki67 (P=0.009) expression, with non-significant trends seen with increasing MEK5 expression. There were significant associations between Gleason grade and the number of cells traversing G1 phase (Ki67LI-gemininLI; (P=0.001)), with high ERK5 levels associated with both an increase in replication licensed but non-cycling cells (Mcm2LI-Ki67LI; (P=0.01)) and accelerated cell cycle progression (gemininLI/Ki67LI; (P= 0.005)), all indicative of a shift towards increasing proliferative potential. While Mcm2 and Ki67 were both prognostic factors on univariate analysis, only Mcm2 remained an independent prognostic marker on multivariate analysis. Taken together, our data show that induction of MEK5/ERK5 signalling is linked to activation of the DNA replication licensing pathway in PCa, and that the strong prognostic value of MCM proteins may result from their function as relay stations coupling growth regulatory pathways to genome duplication.
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Affiliation(s)
- T J Dudderidge
- Department of Pathology and Royal Free and University College Medical School, University College London, Rockefeller Building, University Street, London, WC1E 6JJ, UK
| | - S R McCracken
- Northern Institute for Cancer Research, University of Newcastle, Paul O'Gorman Building, Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK
| | - M Loddo
- Department of Pathology and Royal Free and University College Medical School, University College London, Rockefeller Building, University Street, London, WC1E 6JJ, UK
| | - T R Fanshawe
- Department of Public Health and Primary Care, Centre for Applied Medical Statistics, Institute of Public Health,University of Cambridge, Forvie Site, Robinson Way, Cambridge, CB2 2SR, UK
| | - J D Kelly
- Department of Oncology and Hutchison MRC Research Centre, University of Cambridge, Hills Road, Cambridge, CB2 2XZ, UK
| | - D E Neal
- Department of Oncology and Hutchison MRC Research Centre, University of Cambridge, Hills Road, Cambridge, CB2 2XZ, UK
| | - H Y Leung
- Northern Institute for Cancer Research, University of Newcastle, Paul O'Gorman Building, Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK
| | - G H Williams
- Department of Pathology and Royal Free and University College Medical School, University College London, Rockefeller Building, University Street, London, WC1E 6JJ, UK
- Wolfson Institute for Biomedical Research, University College London, The Cruciform Building, Gower Street, London, WC1E 6BT, UK
- E-mail:
| | - K Stoeber
- Department of Pathology and Royal Free and University College Medical School, University College London, Rockefeller Building, University Street, London, WC1E 6JJ, UK
- Wolfson Institute for Biomedical Research, University College London, The Cruciform Building, Gower Street, London, WC1E 6BT, UK
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50
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Winter SF, Acevedo VD, Gangula RD, Freeman KW, Spencer DM, Greenberg NM. Conditional activation of FGFR1 in the prostate epithelium induces angiogenesis with concomitant differential regulation of Ang-1 and Ang-2. Oncogene 2007; 26:4897-907. [PMID: 17297442 DOI: 10.1038/sj.onc.1210288] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The expression of fibroblast growth factor receptor (FGFR)-1 correlates with angiogenesis and is associated with prostate cancer (CaP) progression. To more precisely define the molecular mechanisms whereby FGFR1 causes angiogenesis in the prostate we exploited a transgenic mouse model, JOCK-1, in which activation of a conditional FGFR1 allele in the prostate epithelium caused rapid angiogenesis and progressive hyperplasia. By labeling the vasculature in vivo and applying a novel method to measure the vasculature in three dimensions, we were able to observe a significant increase in vascular volume 1 week after FGFR1 activation. Although vessel volume and branching both continued to increase throughout a 6-week period of FGFR1 activation, importantly, we discovered that continued activation of FGFR1 was not required to maintain the new vasculature. Exploring the molecular mediators of the angiogenic phenotype, we observed consistent upregulation of HIF-1alpha, vascular endothelial growth factor (VEGF) and angiopoietin 2 (Ang-2), whereas expression of Ang-1 was lost. Further analysis revealed that loss of Ang-1 expression occurred in the basal epithelium, whereas the increase in Ang-2 expression occurred in the luminal epithelium. Reporter assays confirmed that the Ang-2 promoter was regulated by FGFR1 signaling and a small molecule inhibitor of FGFR activity, PD173074, could abrogate this response. These findings establish a method to follow spontaneous angiogenesis in a conditional autochthonous system, implicate the angiopoietins as downstream effectors of FGFR1 activation in vivo, and suggest that therapies targeting FGFR1 could be used to inhibit neovascularization during initiation and progression of CaP.
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Affiliation(s)
- S F Winter
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
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