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Soliman L, De Souza A, Srinivasan P, Danish M, Bertone P, El-Deiry WS, Carneiro BA. The Role of BCL-2 Proteins in the Development of Castration-resistant Prostate Cancer and Emerging Therapeutic Strategies. Am J Clin Oncol 2021; 44:374-382. [PMID: 34014842 DOI: 10.1097/coc.0000000000000829] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The development of androgen resistance in advanced prostate cancer remains a challenging clinical problem. Because androgen deprivation therapy constitutes the backbone of first-line treatments for metastatic prostate cancer, the phenotypic switch from an androgen-dependent to an androgen-independent growth state limits the treatment options for these patients. This critical change from an androgen-dependent to an androgen-independent growth state can be regulated by the B-cell lymphoma gene 2 (BCL-2) family of apoptotic proteins. While the roles of BCL-2 protein family members in the carcinogenesis of prostate cancer have been well-studied, emerging data also delineates their modulation of disease progression to castration-resistant prostate cancer (CRPC). Over the past 2 decades, investigators have sought to describe the mechanisms that underpin this development at the molecular level, yet no recent literature has consolidated these findings in a dedicated review. As new classes of BCL-2 family inhibitors are finding indications for other cancer types, it is time to evaluate how such agents might find stable footing for the treatment of CRPC. Several trials to date have investigated BCL-2 inhibitors as therapeutic agents for CRPC. These therapies include selective BCL-2 inhibitors, pan-BCL-2 inhibitors, and novel inhibitors of MCL-1 and BCL-XL. This review details the research regarding the role of BCL-2 family members in the pathogenesis of prostate cancer and contextualizes these findings within the contemporary landscape of prostate cancer treatment.
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Affiliation(s)
- Luke Soliman
- Warren Alpert Medical School of Brown University
| | - Andre De Souza
- Warren Alpert Medical School of Brown University
- Division of Hematology/Oncology, Lifespan Cancer Institute
- Cancer Center at Brown University
| | | | - Matthew Danish
- Warren Alpert Medical School of Brown University
- Division of Hematology/Oncology, Lifespan Cancer Institute
| | - Paul Bertone
- Warren Alpert Medical School of Brown University
- Division of Hematology/Oncology, Lifespan Cancer Institute
- Cancer Center at Brown University
| | - Wafik S El-Deiry
- Warren Alpert Medical School of Brown University
- Division of Hematology/Oncology, Lifespan Cancer Institute
- Cancer Center at Brown University
- Department of Pathology and Laboratory Medicine, The Warren Alpert Medical School, Brown University, Providence, RI
| | - Benedito A Carneiro
- Warren Alpert Medical School of Brown University
- Division of Hematology/Oncology, Lifespan Cancer Institute
- Cancer Center at Brown University
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2
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Masilamani AP, Dettmer-Monaco V, Monaco G, Cathomen T, Kuckuck I, Schultze-Seemann S, Huber N, Wolf P. An Anti-PSMA Immunotoxin Reduces Mcl-1 and Bcl2A1 and Specifically Induces in Combination with the BAD-Like BH3 Mimetic ABT-737 Apoptosis in Prostate Cancer Cells. Cancers (Basel) 2020; 12:cancers12061648. [PMID: 32580291 PMCID: PMC7352695 DOI: 10.3390/cancers12061648] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 05/29/2020] [Accepted: 06/03/2020] [Indexed: 12/25/2022] Open
Abstract
Background: Upregulation of anti-apoptotic Bcl-2 proteins in advanced prostate cancer leads to therapeutic resistance by prevention of cell death. New therapeutic approaches aim to target the Bcl-2 proteins for the restoration of apoptosis. Methods: The immunotoxin hD7-1(VL-VH)-PE40 specifically binds to the prostate specific membrane antigen (PSMA) on prostate cancer cells and inhibits protein biosynthesis. It was tested with respect to its effects on the expression of anti-apoptotic Bcl-2 proteins. Combination with the BAD-like mimetic ABT-737 was examined on prostate cancer cells and 3D spheroids and in view of tumor growth and survival in the prostate cancer SCID mouse xenograft model. Results: The immunotoxin led to a specific inhibition of Mcl-1 and Bcl2A1 expression in PSMA expressing target cells. Its combination with ABT-737, which inhibits Bcl-2, Bcl-xl, and Bcl-w, led to an induction of the intrinsic apoptotic pathway and to a synergistic cytotoxicity in prostate cancer cells and 3D spheroids. Furthermore, combination therapy led to a significantly prolonged survival of mice bearing prostate cancer xenografts based on an inhibition of tumor growth. Conclusion: The combination therapy of anti-PSMA immunotoxin plus ABT-737 represents the first tumor-specific therapeutic approach on the level of Bcl-2 proteins for the induction of apoptosis in prostate cancer.
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Affiliation(s)
- Anie P. Masilamani
- Department of Urology, Medical Center—University of Freiburg, 79106 Freiburg, Germany; (A.P.M.); (I.K.); (S.S.-S.); (N.H.)
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
| | - Viviane Dettmer-Monaco
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
- Institute for Transfusion Medicine and Gene Therapy, Medical Center—University of Freiburg, 79106 Freiburg, Germany
- Center for Chronic Immunodeficiency, University of Freiburg, 79106 Freiburg, Germany
| | - Gianni Monaco
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
- Institute for Transfusion Medicine and Gene Therapy, Medical Center—University of Freiburg, 79106 Freiburg, Germany
- Center for Chronic Immunodeficiency, University of Freiburg, 79106 Freiburg, Germany
| | - Toni Cathomen
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
- Institute for Transfusion Medicine and Gene Therapy, Medical Center—University of Freiburg, 79106 Freiburg, Germany
- Center for Chronic Immunodeficiency, University of Freiburg, 79106 Freiburg, Germany
| | - Irina Kuckuck
- Department of Urology, Medical Center—University of Freiburg, 79106 Freiburg, Germany; (A.P.M.); (I.K.); (S.S.-S.); (N.H.)
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
| | - Susanne Schultze-Seemann
- Department of Urology, Medical Center—University of Freiburg, 79106 Freiburg, Germany; (A.P.M.); (I.K.); (S.S.-S.); (N.H.)
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
| | - Nathalie Huber
- Department of Urology, Medical Center—University of Freiburg, 79106 Freiburg, Germany; (A.P.M.); (I.K.); (S.S.-S.); (N.H.)
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
| | - Philipp Wolf
- Department of Urology, Medical Center—University of Freiburg, 79106 Freiburg, Germany; (A.P.M.); (I.K.); (S.S.-S.); (N.H.)
- Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (V.D.-M.); (G.M.); (T.C.)
- Correspondence: ; Tel.: +49-761-270-28921
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3
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Lim B, Greer Y, Lipkowitz S, Takebe N. Novel Apoptosis-Inducing Agents for the Treatment of Cancer, a New Arsenal in the Toolbox. Cancers (Basel) 2019; 11:cancers11081087. [PMID: 31370269 PMCID: PMC6721450 DOI: 10.3390/cancers11081087] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 07/11/2019] [Accepted: 07/17/2019] [Indexed: 02/06/2023] Open
Abstract
Evasion from apoptosis is an important hallmark of cancer cells. Alterations of apoptosis pathways are especially critical as they confer resistance to conventional anti-cancer therapeutics, e.g., chemotherapy, radiotherapy, and targeted therapeutics. Thus, successful induction of apoptosis using novel therapeutics may be a key strategy for preventing recurrence and metastasis. Inhibitors of anti-apoptotic molecules and enhancers of pro-apoptotic molecules are being actively developed for hematologic malignancies and solid tumors in particular over the last decade. However, due to the complicated apoptosis process caused by a multifaceted connection with cross-talk pathways, protein–protein interaction, and diverse resistance mechanisms, drug development within the category has been extremely challenging. Careful design and development of clinical trials incorporating predictive biomarkers along with novel apoptosis-inducing agents based on rational combination strategies are needed to ensure the successful development of these molecules. Here, we review the landscape of currently available direct apoptosis-targeting agents in clinical development for cancer treatment and update the related biomarker advancement to detect and validate the efficacy of apoptosis-targeted therapies, along with strategies to combine them with other agents.
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Affiliation(s)
- Bora Lim
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
| | - Yoshimi Greer
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Stanley Lipkowitz
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Naoko Takebe
- Early Clinical Trials Development, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Bethesda, MD 20892, USA.
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4
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Wolf P. Tumor-Specific Induction of the Intrinsic Apoptotic Pathway-A New Therapeutic Option for Advanced Prostate Cancer? Front Oncol 2019; 9:590. [PMID: 31312616 PMCID: PMC6614431 DOI: 10.3389/fonc.2019.00590] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 06/17/2019] [Indexed: 12/18/2022] Open
Affiliation(s)
- Philipp Wolf
- Department of Urology, Medical Center - University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany
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5
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Baust JM, Corwin W, Snyder KK, Van Buskirk R, Baust JG. Cryopreservation: Evolution of Molecular Based Strategies. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 951:13-29. [PMID: 27837551 DOI: 10.1007/978-3-319-45457-3_2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Cryopreservation (CP) is an enabling process providing for on-demand access to biological material (cells and tissues) which serve as a starting, intermediate or even final product. While a critical tool, CP protocols, approaches and technologies have evolved little over the last several decades. A lack of conversion of discoveries from the CP sciences into mainstream utilization has resulted in a bottleneck in technological progression in areas such as stem cell research and cell therapy. While the adoption has been slow, discoveries including molecular control and buffering of cell stress response to CP as well as the development of new devices for improved sample freezing and thawing are providing for improved CP from both the processing and sample quality perspectives. Numerous studies have described the impact, mechanisms and points of control of cryopreservation-induced delayed-onset cell death (CIDOCD). In an effort to limit CIDOCD, efforts have focused on CP agent and freeze media formulation to provide a solution path and have yielded improvements in survival over traditional approaches. Importantly, each of these areas, new technologies and cell stress modulation, both individually and in combination, are now providing a new foundation to accelerate new research, technology and product development for which CP serves as an integral component. This chapter provides an overview of the molecular stress responses of cells to cryopreservation, the impact of the hypothermic and cell death continuums and the targeted modulation of common and/or cell specific responses to CP in providing a path to improving cell quality.
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Affiliation(s)
- John M Baust
- CPSI Biotech, 2 Court St, Owego, NY, 13827, USA. .,Institute of Biomedical Technology, State University of New York at Binghamton, 4400 Vestal Parkway East, Binghamton, NY, 13902, USA.
| | - William Corwin
- Department of Immunology and Carole and Ray Neag Comprehensive Cancer Center, University of Connecticut School of Medicine, Farmington, CT, 06030, USA
| | - Kristi K Snyder
- CPSI Biotech, 2 Court St, Owego, NY, 13827, USA.,Institute of Biomedical Technology, State University of New York at Binghamton, 4400 Vestal Parkway East, Binghamton, NY, 13902, USA
| | - Robert Van Buskirk
- CPSI Biotech, 2 Court St, Owego, NY, 13827, USA.,Institute of Biomedical Technology, State University of New York at Binghamton, 4400 Vestal Parkway East, Binghamton, NY, 13902, USA.,Department of Biological Sciences, Binghamton University, 4400 Vestal Parkway East, Binghamton, NY, 13902, USA
| | - John G Baust
- Institute of Biomedical Technology, State University of New York at Binghamton, 4400 Vestal Parkway East, Binghamton, NY, 13902, USA.,Department of Biological Sciences, Binghamton University, 4400 Vestal Parkway East, Binghamton, NY, 13902, USA
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6
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Baust JG, Snyder KK, Van Buskirk R, Baust JM. Integrating Molecular Control to Improve Cryopreservation Outcome. Biopreserv Biobank 2017; 15:134-141. [DOI: 10.1089/bio.2016.0119] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- John G. Baust
- Institute of Biomedical Technology, State University of New York at Binghamton, Binghamton, New York
- Department of Biological Sciences, Binghamton University, Binghamton, New York
| | - Kristi K. Snyder
- Institute of Biomedical Technology, State University of New York at Binghamton, Binghamton, New York
- CPSI Biotech, Owego, New York
| | - Robert Van Buskirk
- Institute of Biomedical Technology, State University of New York at Binghamton, Binghamton, New York
- Department of Biological Sciences, Binghamton University, Binghamton, New York
- CPSI Biotech, Owego, New York
| | - John M. Baust
- Institute of Biomedical Technology, State University of New York at Binghamton, Binghamton, New York
- CPSI Biotech, Owego, New York
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7
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Huang Y, Shen P, Chen X, Chen Z, Zhao T, Chen N, Gong J, Nie L, Xu M, Li X, Zeng H, Zhou Q. Transcriptional regulation of BNIP3 by Sp3 in prostate cancer. Prostate 2015; 75:1556-67. [PMID: 26012884 DOI: 10.1002/pros.23029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 05/05/2015] [Indexed: 02/05/2023]
Abstract
BACKGROUND The transcription factors Sp3/Sp1 are expressed in a various types of cancers and BNIP3 is overexpressed in prostate cancer. Although it has been demonstrated that BNIP3 is transcriptionally regulated by HIF-1α and is post-transcriptionally regulated by miR145, our previous data indicated that there might be some other transcription factors regulating BNIP3 in prostate cancer. This study is conducted to investigate whether BNIP3 expression is directly regulated by Sp3/Sp1 or not. MATERIALS AND METHODS Bioinformatics analysis shows that BNIP3 promoter contains several potential Sp3/Sp1 binding sites. And then it is demonstrated that SP3 could regulate the BNIP3 transcriptionally by binding to the predicted sites by dual reporter gene assays, ChIP, and EMSA. The biological effects of SP3 regulating BNIP3 on prostate cancer cells proliferation are measured by MTT, TUNEL, and flow cytometry. RESULTS Our data show that Sp3 but not Sp1, is positively related to BNIP3 overexpression in prostate cancer. Sp3 can directly regulate BNIP3 transcription by mainly binding to the Sp3 binding sites (-624~-615 and -350~-343) of BNIP3 promoter. Knockdown of Sp3 by RNA interference could reduce cells growth and lead to cells apoptosis in PC-3 and DU145. Sp3-dependent BNIP3 overexpression might be an important mechanism to promote prostate cancer cells proliferation. CONCLUSION This is the first study to provide direct evidence of Sp3-dependent BNIP3 expression. Sp3 might be the major transcriptional regulator of BNIP3 in prostate cancer and it is worthy to further study. The regulation of BNIP3 by Sp3 may be a new cancer-specific therapeutic target in prostate cancer.
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Affiliation(s)
- Ying Huang
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
- Department of Pathology, Fujian Provincial Hospital, Fuzhou, China
| | - Pengfei Shen
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Xueqin Chen
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Zhibin Chen
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Tao Zhao
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Ni Chen
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Jing Gong
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Ling Nie
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Miao Xu
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Xinglan Li
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
| | - Hao Zeng
- Department of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Qiao Zhou
- Department of Pathology and Laboratory of Pathology, West China Hospital, Sichuan University, Chengdu, China
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8
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Twu O, Dessí D, Vu A, Mercer F, Stevens GC, de Miguel N, Rappelli P, Cocco AR, Clubb RT, Fiori PL, Johnson PJ. Trichomonas vaginalis homolog of macrophage migration inhibitory factor induces prostate cell growth, invasiveness, and inflammatory responses. Proc Natl Acad Sci U S A 2014; 111:8179-84. [PMID: 24843155 PMCID: PMC4050605 DOI: 10.1073/pnas.1321884111] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The human-infective parasite Trichomonas vaginalis causes the most prevalent nonviral sexually transmitted infection worldwide. Infections in men may result in colonization of the prostate and are correlated with increased risk of aggressive prostate cancer. We have found that T. vaginalis secretes a protein, T. vaginalis macrophage migration inhibitory factor (TvMIF), that is 47% similar to human macrophage migration inhibitory factor (HuMIF), a proinflammatory cytokine. Because HuMIF is reported to be elevated in prostate cancer and inflammation plays an important role in the initiation and progression of cancers, we have explored a role for TvMIF in prostate cancer. Here, we show that TvMIF has tautomerase activity, inhibits macrophage migration, and is proinflammatory. We also demonstrate that TvMIF binds the human CD74 MIF receptor with high affinity, comparable to that of HuMIF, which triggers activation of ERK, Akt, and Bcl-2-associated death promoter phosphorylation at a physiologically relevant concentration (1 ng/mL, 80 pM). TvMIF increases the in vitro growth and invasion through Matrigel of benign and prostate cancer cells. Sera from patients infected with T. vaginalis are reactive to TvMIF, especially in males. The presence of anti-TvMIF antibodies indicates that TvMIF is released by the parasite and elicits host immune responses during infection. Together, these data indicate that chronic T. vaginalis infections may result in TvMIF-driven inflammation and cell proliferation, thus triggering pathways that contribute to the promotion and progression of prostate cancer.
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Affiliation(s)
| | - Daniele Dessí
- Dipartimento di Scienze Biomediche, Università degli Studi di Sassari, 07100 Sassari, Italy; and
| | - Anh Vu
- Department of Microbiology, Immunology, and Molecular Genetics, and
| | - Frances Mercer
- Department of Microbiology, Immunology, and Molecular Genetics, and
| | - Grant C Stevens
- Department of Microbiology, Immunology, and Molecular Genetics, and
| | - Natalia de Miguel
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús, 1650 Chascomús, Argentina
| | - Paola Rappelli
- Dipartimento di Scienze Biomediche, Università degli Studi di Sassari, 07100 Sassari, Italy; and
| | - Anna Rita Cocco
- Dipartimento di Scienze Biomediche, Università degli Studi di Sassari, 07100 Sassari, Italy; and
| | - Robert T Clubb
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095
| | - Pier Luigi Fiori
- Dipartimento di Scienze Biomediche, Università degli Studi di Sassari, 07100 Sassari, Italy; and
| | - Patricia J Johnson
- Molecular Biology Institute,Department of Microbiology, Immunology, and Molecular Genetics, and
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Bates DJP, Lewis LD. Manipulating the apoptotic pathway: potential therapeutics for cancer patients. Br J Clin Pharmacol 2013; 76:381-95. [PMID: 23782006 PMCID: PMC3769666 DOI: 10.1111/bcp.12193] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Accepted: 05/20/2013] [Indexed: 12/14/2022] Open
Abstract
This review summarizes the current state of scientific understanding of the apoptosis pathway, with a focus on the proteins involved in the pathway, their interactions and functions. This forms the rationale for detailing the preclinical and clinical pharmacology of drugs that modulate the pivotal proteins in this pathway, with emphasis on drugs that are furthest advanced in clinical development as anticancer agents. There is a focus on describing drugs that modulate three of the most promising targets in the apoptosis pathway, namely antibodies that bind and activate the death receptors, small molecules that inhibit the anti-apoptotic Bcl-2 family proteins, and small molecules and antisense oligonucleotides that inactivate the inhibitors of apoptosis, all of which drive the equilibrium of the apoptotic pathway towards apoptosis. These structurally different yet functionally related groups of drugs represent a promising novel approach to anticancer therapeutics whether used as monotherapy or in combination with either classical cytotoxic or other molecularly targeted anticancer agents.
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Affiliation(s)
- Darcy J P Bates
- Department of Pharmacology and Toxicology, Geisel School of Medicine at Dartmouth, The Norris Cotton Cancer Center, Lebanon, NH, USA
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10
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Rubenstein M, Hollowell CMP, Guinan P. Oligonucleotide suppression of bcl-2 in LNCaP cells is compensated by increased androgen sensitivity, p53 and oncogene activity, and suppressed caspase-3. Med Oncol 2013; 30:599. [PMID: 23677569 DOI: 10.1007/s12032-013-0599-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 05/01/2013] [Indexed: 11/30/2022]
Abstract
Antisense oligonucleotides (oligos) have been employed against prostate cancer models in both in vivo and in vitro systems. While most target growth factors or their receptors, other oligos are directed against inhibitors of apoptosis or mediators of androgen action. Those which suppress bcl-2 activity (in prostate cancer patients) have even reached clinical trials. We evaluated a set of oligos which targeted and comparably suppressed the expression of bcl-2, an apoptosis inhibitory protein. Our first study reported that LNCaP cells were adapted by suppression of caspase-3 (a promoter of apoptosis). In this study we evaluated additional proteins associated with tumor progression and found the expression of the androgen receptor, its p300 and IL-6 co-activators, as well as v-myc (oncogenic) and (unexpectedly) tumor suppressor p53 genes to be enhanced. We conclude that oligo treatment directed against bcl-2, intended to stimulate apoptosis, can be evaded through compensatory changes in gene activity associated with additional regulators of apoptosis, androgen sensitivity and oncogenesis. This suggests that therapeutic suppression of bcl-2 can promote tumor resistance and transformation to a more aggressive (androgen and oncogene driven) phenotype.
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Affiliation(s)
- Marvin Rubenstein
- Division of Cellular Biology, Hektoen Institute for Medical Research, 2240 West Ogden Avenue, 2'nd floor, Chicago, IL 60612, USA.
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11
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Rubenstein M, Hollowell CMP, Guinan P. Increased expression of the androgen receptor with p300 and interleukin-6 coactivators compensate for oligonucleotide suppression of bcl-2: no increased CREB binding protein or interleukin-4 expression. Ther Adv Urol 2013; 5:85-93. [PMID: 23554843 DOI: 10.1177/1756287212466281] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Antisense oligonucleotides (oligos) have been employed against in vivo and in vitro prostate cancer models targeting growth regulatory proteins. While most oligos have targeted growth factors or their receptors, others have been directed against inhibitors of apoptosis and mediators of androgen action. We previously evaluated a set of oligos which targeted and comparably suppressed the expression of the apoptosis inhibitor protein bcl-2. LNCaP cells adapted to this restoration of apoptosis with suppression of caspase 3 (an apoptosis promoter) and an enhanced expression of the androgen receptor (AR), suggesting an increased sensitivity to androgens. METHODS AND RESULTS In a continuation of this study, we evaluated the expression of AR coactivators p300, its homolog CREB binding protein (CREBBP) and cytokines interleukin (IL)-4 and IL-6, finding p300 and IL-6 similarly enhanced. CONCLUSIONS LNCaP cells are hormone sensitive and untreated cells express minimal p300 activity. Therefore, the enhanced expression which followed oligo treatment makes its induction more impressive and implies a pattern of gene expression more associated with later stage (androgen insensitive) disease. This suggests that oligo treatment directed against bcl-2 can be evaded through compensatory changes in AR expression and some coactivators, promoting tumor growth, and may promote transformation of the tumor to a more aggressive phenotype.
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Affiliation(s)
- Marvin Rubenstein
- Departments of Biochemistry and Urology, Rush University Medical Center, Chicago, IL; Division of Urology, Stroger Hospital of Cook County, Chicago, IL; Chairman-Division of Cellular Biology, Hektoen Institute for Medical Research, 2240 West Ogden Avenue, 2nd floor, Chicago, IL 60612, USA
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12
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Pushkarev VM, Kovzun OI, Pushkarev VV, Tronko MD. Biochemical effects of combined action of gamma-irradiation and paclitaxel on anaplastic thyroid cancer cells. UKRAINIAN BIOCHEMICAL JOURNAL 2013; 85:51-61. [PMID: 23534290 DOI: 10.15407/ubj85.01.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The aim of the paper was to describe the biochemical effects of Paclitaxel (Ptx), gamma-irradiation (IR) and their combination in undifferentiated thyroid cancer cells (ATC). IR activated common DNA damage-induced signaling and manifested certain mitogenic effect by inactivation of retinoblastoma protein (pRb). There was clear antagonism between Ptx and IR relative to cell cycle regulators--tumor suppressor p53, pRb, CHK2 and c-Abl as well as proapoptotic Bax expression, but combined action of both agents enhanced caspase-3 and, especially, caspase-8 activation. The Ptx at low (1-25 nM) concentrations caused noticeable radioprotective effect. Thus, in ATC cells the ionizing radiation and Ptx exhibited competitive effects upon phosphorylation of cell cycle controllers: p53, pRb, CHK2, cAbl and expression of Bax. At the same time, the combined effect of radiation and Ptx enhanced antiapoptotic Bcl-2 phosphorylation, caspases activation and survivin expression. The net effect of these events during the first 48-72 h of cells incubation can be considered as antiapoptotic--Ptx attenuated cytotoxic effect of IR.
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Affiliation(s)
- V M Pushkarev
- State Institution V. P. Komisarenko Institute of Endocrinology & Metabolism, National Academy of Medical Sciences of Ukraine, Kyiv.
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13
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Rubenstein M, Hollowell CMP, Guinan P. In LNCaP cells enhanced expression of both androgen receptor and costimulatory protein p300 compensate for antisense oligonucleotide suppression of bcl-2. Ther Adv Urol 2011; 3:243-50. [PMID: 22164193 PMCID: PMC3229248 DOI: 10.1177/1756287211426155] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Antisense oligonucleotides (oligos) have been employed against in vivo and in vitro prostate cancer models targeting growth stimulatory gene products. While most oligos have targeted growth factors or their receptors, others have been directed against inhibitors of apoptosis and mediators of androgen action. In LNCaP cells we evaluated a set of oligos which targeted and comparably suppressed the expression of the apoptosis inhibitor protein bcl-2. LNCaP cells adapted to this restoration of apoptosis with an enhanced expression of the androgen receptor (AR) suggesting an increased sensitivity to androgens. In a continuation of this study, we now evaluate the expression of p300, an AR coactivating protein expressed in the later stages of prostate cancer. METHOD AND RESULTS In previous experiments, monospecific and bispecific oligos directed against bcl-2 suppressed both the targeted bcl-2 protein (an inhibitor of apoptosis) and the nontargeted caspase-3 (a promoter of apoptosis), potentially negating the effect on apoptosis produced by specific inhibition of bcl-2. In a further study we reported that expression of the AR was significantly enhanced by these oligos. We now report that expression of p300 is similarly enhanced. LNCaP cells are hormone sensitive and the untreated cells expressed minimal p300 activity. CONCLUSIONS The enhanced expression which followed oligo treatment makes its induction more impressive, and implies a pattern of gene expression more associated with later stage (androgen-insensitive) disease. This suggests that oligo treatment directed against bcl-2 not only can be evaded through compensatory changes in AR expression which promotes tumor growth, but the induced expression of p300 may transition the tumor to a more dedifferentiated and aggressive phenotype.
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Rubenstein M, Hollowell CMP, Guinan P. In LNCaP cells enhanced expression of the androgen receptor compensates for Bcl-2 suppression by antisense oligonucleotides. Ther Adv Urol 2011; 3:51-7. [PMID: 21869905 DOI: 10.1177/1756287211400493] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND AND METHODS Antisense oligonucleotides (oligos) have been employed against in vivo and in vitro prostate cancer models targeting growth stimulatory gene products. While most oligos have targeted growth factors or their receptors, others have been directed against inhibitors of apoptosis. In LNCaP cells we evaluated a set of oligos which targeted and comparably suppressed the expression of the apoptosis inhibitor protein Bcl-2. LNCaP cells adapted to this restoration of apoptosis with a compensatory suppression of caspase-3 expression, a nontargeted promoter of this process. In a continuation of this study we now evaluate the expression of the androgen receptor (AR) following oligo mediated regulation of apoptosis with suppression of Bcl-2. RESULTS Monospecific and bispecific oligos directed against Bcl-2 suppressed both the targeted Bcl-2 protein (an inhibitor of apoptosis) and the nontargeted caspase-3 (a promoter of apoptosis), potentially negating the effect on apoptosis produced by specific inhibition of Bcl-2. In contrast, the expression of the AR was significantly enhanced by each type of oligo. CONCLUSIONS This suggests that when Bcl-2 expression is inhibited there are compensatory changes in the expression of additional proteins which regulate tumor growth, apoptosis and cell survival, and in this scenario might increase or re-establish hormonal sensitivity. If tumors variants are selected which evade gene therapy additional mechanisms of compensation must be identified and subsequently suppressed. These experiments identify pathways by which tumors can develop resistance to gene therapy and suggests additional targets for intervention.
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Affiliation(s)
- Marvin Rubenstein
- Chairman-Division of Cellular Biology, Hektoen Institute for Medical Research, Chicago, IL 60612, USA; Departments of Biochemistry and Urology, Rush University Medical Center, Chicago, IL 60612, USA; The Division of Urology, Stroger Hospital of Cook County, Chicago, IL 60612, USA
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Rubenstein M, Hollowell CMP, Guinan P. Compensatory and non-compensatory effects on protein expression following BCL-2 suppression by antisense oligonucleotides. Med Oncol 2011; 29:2284-90. [PMID: 22038727 DOI: 10.1007/s12032-011-0097-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 10/18/2011] [Indexed: 11/24/2022]
Abstract
Antisense oligonucleotides (oligos) have been employed against in vivo and in vitro prostate cancer models targeting growth regulatory proteins. In LNCaP cells, we evaluated both monospecific and bispecific oligos that targeted and comparably suppressed the expression of bcl-2, an apoptosis inhibitory protein. Cells compensated with both suppressed caspase-3 (an apoptosis promoter) activity, and an enhancement of both androgen receptor (AR) and p300 expression. This suggests that a progression to increased androgen sensitivity accompanies bcl-2 suppression, in this tumor line. To further evaluate mechanisms of adaptation, we now evaluate the effects upon the expression of insulin-like growth factor (IGF1) and another AR coactivator, IL-4, thought to increase prostate cancer growth. IGF1 expression was not significantly altered suggesting this pathway need not be regulated when bcl-2 directed gene therapy is employed. In contrast to increased AR and p300 expression that compensated for bcl-2 suppression, the AR coactivator IL-4 expression was not increased, suggesting no role in any increased androgen sensitivity.
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Affiliation(s)
- Marvin Rubenstein
- Division of Cellular Biology, Hektoen Institute for Medical Research, 2240 West Ogden Avenue, 2nd Floor, Chicago, IL 60612, USA.
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16
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Tsang TY, Tang WY, Chan JYW, Co NN, Au Yeung CL, Yau PL, Kong SK, Fung KP, Kwok TT. P-glycoprotein enhances radiation-induced apoptotic cell death through the regulation of miR-16 and Bcl-2 expressions in hepatocellular carcinoma cells. Apoptosis 2011; 16:524-35. [PMID: 21336967 DOI: 10.1007/s10495-011-0581-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
P-glycoprotein (Pgp), an efflux pump, was confirmed the first time to regulate the expressions of miR/gene in cells. Pgp is known to be associated with multidrug resistance. RHepG2 cells, the multidrug resistant subline of human hepatocellular carcinoma HepG2 cells, expressed higher levels of Pgp as well as miR-16, and lower level of Bcl-2 than the parental cells. In addition, RHepG2 cells were more radiation sensitive and showed more pronounced radiation-induced apoptotic cell death than the parental cells. Mechanistic analysis revealed that transfection with mdr1 specific antisense oligos suppressed radiation-induced apoptosis in HepG2 cells. On the other hand, ectopic mdr1 expression enhanced radiation-induced apoptosis in HepG2 cells, SK-HEP-1 cells, MiHa cells, and furthermore, induced miR-16 and suppressed its target gene Bcl-2 in HepG2 cells. Moreover, the enhancement effects of Pgp and miR-16 on radiation-induced apoptosis were counteracted by overexpression of Bcl-2. The Pgp effect on miR-16/Bcl-2 was suppressed by Pgp blocker verapamil indicating the importance of the efflux of Pgp substrates. The present study is the first to reveal the role of Pgp in regulation of miRNA/gene expressions. The findings may provide new perspective in understanding the biological function of Pgp.
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Affiliation(s)
- Tsun Yee Tsang
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China.
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Ji K, Wang B, Shao YT, Zhang L, Liu YN, Shao C, Li XJ, Li X, Hu JD, Zhao XJ, Xu DQ, Li Y, Cai L. Synergistic Suppression of Prostatic Cancer Cells by Coexpression of BothMurine Double Minute 2Small Interfering RNA and Wild-Typep53Gene In Vitro and In Vivo. J Pharmacol Exp Ther 2011; 338:173-83. [DOI: 10.1124/jpet.111.180364] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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Bax expression remains unchanged following antisense treatment directed against BCL-2. Med Oncol 2010; 28:852-8. [PMID: 20422317 DOI: 10.1007/s12032-010-9543-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Accepted: 04/15/2010] [Indexed: 10/19/2022]
Abstract
Antisense oligonucleotides (oligos) have been evaluated in both in vivo and in vitro prostate cancer models. Although most contain a single mRNA binding site, our laboratory has also evaluated bispecific types directed toward two proteins. This study evaluates the inhibition of in vitro propagating LNCaP cells employing mono- and bispecific oligos directed against bcl-2 [the second binding site was directed against the epidermal growth factor receptor (EGFR)]. Employing RT-PCR, the expression of two apoptosis regulating proteins, bcl-2 and non-targeted bax, was then evaluated. LNCaP prostate tumor cells were initially incubated for 24 h in the presence of oligos (6.25 μM) directed against bcl-2 and compared to lipofectin containing controls. Comparable and significant growth inhibition was produced by both mono- and bispecific forms. Employing RT-PCR to determine the expression of bcl-2, we found that the greatest amount of mRNA suppression approached 100% for each oligo type: monospecific MR4 (directed only against bcl-2), 100%; and bispecifics MR24 and MR42, 86 and 100%, respectively. We conclude, based upon both inhibition of in vitro growth and bcl-2 expression, that bispecific antisense oligos directed against EGFR and bcl-2 mRNAs are at least as effective as a monospecific directed solely toward bcl-2. In an effort to determine a compensatory response by cells evading apoptosis in the presence of bcl-2 suppression, the levels of mRNA encoding the non-targeted apoptosis activating protein bax were evaluated. Non-targeted protein suppression by these bispecifics has previously been demonstrated against prostate-specific membrane antigen (PSMA). However, in contrast to effects against bcl-2 and PSMA, no significant alteration in bax expression was produced by either oligo type. In LNCaP cells, bcl-2 suppression does not influence bax expression and, at least for this protein, there is no compensatory change in bax expression regulating apoptosis at this level. Identifying changes in the expression of proteins which regulate apoptosis is important if gene therapy targets bcl-2.
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Vergis R, Corbishley CM, Thomas K, Horwich A, Huddart R, Khoo V, Eeles R, Sydes MR, Cooper CS, Dearnaley D, Parker C. Expression of Bcl-2, p53, and MDM2 in localized prostate cancer with respect to the outcome of radical radiotherapy dose escalation. Int J Radiat Oncol Biol Phys 2010; 78:35-41. [PMID: 20092961 DOI: 10.1016/j.ijrobp.2009.07.1728] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 07/10/2009] [Accepted: 07/16/2009] [Indexed: 02/04/2023]
Abstract
PURPOSE Established prognostic factors in localized prostate cancer explain only a moderate proportion of variation in outcome. We analyzed tumor expression of apoptotic markers with respect to outcome in men with localized prostate cancer in two randomized controlled trials of radiotherapy dose escalation. METHODS AND MATERIALS Between 1995 and 2001, 308 patients with localized prostate cancer received neoadjuvant androgen deprivation and radical radiotherapy at our institution in one of two dose-escalation trials. The biopsy specimens in 201 cases were used to make a biopsy tissue microarray. We evaluated tumor expression of Bcl-2, p53, and MDM2 by immunohistochemistry with respect to outcome. RESULTS Median follow-up was 7 years, and 5-year freedom from biochemical failure (FFBF) was 70.4% (95% CI, 63.5-76.3%). On univariate analysis, expression of Bcl-2 (p < 0.001) and p53 (p = 0.017), but not MDM2 (p = 0.224), was significantly associated with FFBF. Expression of Bcl-2 remained significantly associated with FFBF (p = 0.001) on multivariate analysis, independently of T stage, Gleason score, initial prostate-specific antigen level, and radiotherapy dose. Seven-year biochemical control was 61% vs. 41% (p = 0.0122) for 74 Gy vs. 64 Gy, respectively, among patients with Bcl-2-positive tumors and 87% vs. 81% (p = 0.423) for 74 Gy vs. 64 Gy, respectively, among patients with Bcl-2-negative tumors. There was no statistically significant interaction between dose and Bcl-2 expression. CONCLUSIONS Bcl-2 expression was a significant, independent determinant of biochemical control after neoadjuvant androgen deprivation and radical radiotherapy for prostate cancer. These data generate the hypothesis that Bcl-2 expression could be used to inform the choice of radiotherapy dose in individual patients.
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Affiliation(s)
- Roy Vergis
- Academic Urology Unit, Institute of Cancer Research, Royal Marsden NHS Foundation Trust, Surrey, UK
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Abstract
PURPOSE Apoptosis, as a mode of cell death in irradiated cell populations, has been the subject of literarily hundreds if not thousands of published reports over the past few years. However, in spite of the large body of knowledge related to this subject, the role of apoptosis in determining tumor response to radiotherapy has been and remains poorly understood and controversial. Indeed, some previous reviews have suggested that apoptosis may not be important in this context. The purpose of the present review is to provide some examples of recently reported laboratory investigations that indicate that there is a reasonable expectation that the radiation-induced apoptosis observed has contributed to the tumor response. CONCLUSIONS We review reports in four areas of research: Molecularly targeted agents, in vivo imaging, Bcl-2 and cancer stem cells. Examples are provided in each of these areas that we believe justify a reassessment of the role that apoptosis plays in radiation oncology.
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Affiliation(s)
- Raymond E Meyn
- Department of Experimental Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA.
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Udayakumar TS, Hachem P, Ahmed MM, Agrawal S, Pollack A. Antisense MDM2 enhances E2F1-induced apoptosis and the combination sensitizes androgen-sensitive [corrected] and androgen-insensitive [corrected] prostate cancer cells to radiation. Mol Cancer Res 2009; 6:1742-54. [PMID: 19010821 DOI: 10.1158/1541-7786.mcr-08-0102] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We have previously shown in separate studies that MDM2 knockdown via antisense MDM2 (AS-MDM2) and E2F1 overexpression via adenoviral-mediated E2F1 (Ad-E2F1) sensitized prostate cancer cells to radiation. Because E2F1 and MDM2 affect apoptosis through both common and independent pathways, we hypothesized that coupling these two treatments would result in increased killing of prostate cancer cells. In this study, the effect of Ad-E2F1 and AS-MDM2 in combination with radiation was investigated in three prostate cancer cell lines: LNCaP cells, LNCaP-Res cells [androgen insensitive with functional p53 and androgen receptor (AR)], and PC3 cells (androgen insensitive, p53(null), and AR(null)). A supra-additive radiosensitizing effect was observed in terms of clonogenic inhibition and induction of apoptosis (caspase-3 + caspase-7 activity) in response to Ad-E2F1 plus AS-MDM2 treatments in all three cell lines. In LNCaP and LNCaP-Res, these combination treatments elevated the levels of phospho-Ser(15) p53 with significant induction of p21(waf1/cip1), phospho-gammaH2AX, PUMA, and Bax levels and reduction of AR and bcl-2 expression. Similarly, AR(null) and p53(null) PC-3 cells showed elevated levels of Bax and phospho-gammaH2AX expression. These findings show that the combination of Ad-E2F1 and AS-MDM2 significantly increases cell death in prostate cancer cells exposed to radiation and that this effect occurs in the presence or absence of AR and p53.
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Mahdy AEM, Cheng JC, Li J, Elojeimy S, Meacham WD, Turner LS, Bai A, Gault CR, McPherson AS, Garcia N, Beckham TH, Saad A, Bielawska A, Bielawski J, Hannun YA, Keane TE, Taha MI, Hammouda HM, Norris JS, Liu X. Acid ceramidase upregulation in prostate cancer cells confers resistance to radiation: AC inhibition, a potential radiosensitizer. Mol Ther 2008; 17:430-8. [PMID: 19107118 DOI: 10.1038/mt.2008.281] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Radiation resistance in a subset of prostate tumors remains a challenge to prostate cancer radiotherapy. The current study on the effects of radiation on prostate cancer cells reveals that radiation programs an unpredicted resistance mechanism by upregulating acid ceramidase (AC). Irradiated cells demonstrated limited changes of ceramide levels while elevating levels of sphingosine and sphingosine-1-phosphate. By genetically downregulating AC with small interfering RNA (siRNA), we observed radiosensitization of cells using clonogenic and cytotoxicity assays. Conversely, AC overexpression further decreased sensitivity to radiation. We also observed that radiation-induced AC upregulation was sufficient to create cross-resistance to chemotherapy as demonstrated by decreased sensitivity to Taxol and C(6) ceramide compared to controls. Lower levels of caspase 3/7 activity were detected in cells pretreated with radiation, also indicating increased resistance. Finally, utilization of the small molecule AC inhibitor, LCL385, sensitized PPC-1 cells to radiation and significantly decreased tumor xenograft growth. These data suggest a new mechanism of cancer cell resistance to radiation, through upregulation of AC that is, in part, mediated by application of the therapy itself. An improved understanding of radiotherapy and the application of combination therapy achieved in this study offer new opportunities for the modulation of radiation effects in the treatment of cancer.
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Affiliation(s)
- Ayman E M Mahdy
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425, USA
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Mu Z, Hachem P, Hensley H, Stoyanova R, Kwon HW, Hanlon AL, Agrawal S, Pollack A. Antisense MDM2 enhances the response of androgen insensitive human prostate cancer cells to androgen deprivation in vitro and in vivo. Prostate 2008; 68:599-609. [PMID: 18196567 PMCID: PMC2763092 DOI: 10.1002/pros.20731] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Antisense MDM2 oligonucleotide (AS-MDM2) sensitizes androgen sensitive LNCaP cells to androgen deprivation (AD) in vitro and in vivo. In this study, we investigated the effects of AS-MDM2 combined with AD on androgen resistant LNCaP (LNCaP-Res) and moderately androgen resistant bcl-2 overexpressing LNCaP (LNCaP-BST) cells. METHODS The LNCaP-Res cell line was generated by culturing LNCaP cells in medium containing charcoal-stripped serum for more than 1 year. Apoptosis was quantified in vitro by Annexin V staining and caspase 3 + 7 activity. For the in vivo studies, orthotopic tumor growth was monitored by magnetic resonance imaging (MRI). AS-MDM2 and the mismatch control were given by i.p. injection at doses of 25 mg/kg per day, 5 days/week for 15 days. RESULTS LNCaP-Res cells expressed high levels of androgen receptor (AR) and bcl-2, and displayed no growth inhibition to AD. AS-MDM2 caused significant reductions in MDM2 and AR expression, and increases in p53 and p21 expression in both cell lines. AS-MDM2 + AD resulted in the highest levels of apoptosis in vitro and tumor growth inhibition in vivo in both cell lines; although, these effects were less pronounced in LNCaP-BST cells. CONCLUSIONS AS-MDM2 + AD enhanced apoptotic cell death in vitro and tumor growth inhibition in vivo in androgen resistant cell lines. The action of AS-MDM2 + AD was influenced somewhat by bcl-2 expression as an isolated change (LNCaP-BST cells), but not when accompanied by other molecular changes associated with androgen insensitivity (LNCaP-Res cells). MDM2 knockdown has promise for the treatment of men with early hormone refractory disease.
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Affiliation(s)
- Zhaomei Mu
- Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Paul Hachem
- Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Harvey Hensley
- Department of Basic Science, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Radka Stoyanova
- Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Hae Won Kwon
- Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Alexandra L. Hanlon
- Department of Public Education, Temple University, Philadelphia, Pennsylvania
| | | | - Alan Pollack
- Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania
- Correspondence to: Alan Pollack, MD, PhD, Department of Radiation Oncology, Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111.
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Guan M, Tripathi V, Zhou X, Popescu NC. Adenovirus-mediated restoration of expression of the tumor suppressor gene DLC1 inhibits the proliferation and tumorigenicity of aggressive, androgen-independent human prostate cancer cell lines: prospects for gene therapy. Cancer Gene Ther 2008; 15:371-81. [PMID: 18369381 DOI: 10.1038/cgt.2008.13] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Our recent study showing highly recurrent loss of function of DLC1 (deleted in liver cancer 1), a tumor suppressor gene in primary prostate carcinoma (PCA), implicates this gene in the pathogenesis of this disease. To evaluate the response of PCA to oncosuppressive activity of DLC1, we examined now the effects of adenoviral vector for human DLC1 transduction into the DLC1-deficient, androgen-independent (AI) and aggressive human PCA cell lines PC-3 and C4-2-B2. Adenovirus-mediated restoration of DLC1 expression inhibited the proliferation, invasiveness and anchorage-independent growth of PC-3 and C4-2-B2 cells in vitro as well as the tumorigenicity of PC-3 cells in nude mice. It also induced cell-cycle arrest, inhibited the activation of RhoA and the formation of actin stress fibers. DLC1 induced apoptosis in C4-2-B2 cells, whereas it did not elicit such an effect in PC-3 cells. The abundance of the antiapoptotic protein Bcl-2 was greater in PC-3 cells than in C4-2-B2 cells, and PC-3 cells were rendered sensitive to DLC1-induced apoptosis by treatment with the Bcl-2 inhibitor HA14-1. These results suggest that adenovirus-mediated DLC1 transfer, alone or together with other agents, such as inhibitors of Bcl-2 or histone deacetylase, might prove effective in the treatment of aggressive, AI-PCA.
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Affiliation(s)
- M Guan
- Laboratory of Experimental Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892-4262, USA
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Khor LY, Moughan J, Al-Saleem T, Hammond EH, Venkatesan V, Rosenthal SA, Ritter MA, Sandler HM, Hanks GE, Shipley WU, Pollack A. Bcl-2 and Bax expression predict prostate cancer outcome in men treated with androgen deprivation and radiotherapy on radiation therapy oncology group protocol 92-02. Clin Cancer Res 2007; 13:3585-90. [PMID: 17575222 PMCID: PMC2763095 DOI: 10.1158/1078-0432.ccr-06-2972] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
PURPOSE Bcl-2 is antiapoptotic, and its overexpression has been associated with resistance to androgen deprivation and poor outcome in some patients treated with radiotherapy. Bax is proapoptotic, regulating Bcl-2 through heterodimer formation. In a prior study, Bcl-2 and Bax were not related to outcome in locally advanced patients treated with radiotherapy or short-term androgen deprivation + radiotherapy (STAD+RT) on another Radiation Therapy Oncology Group trial (86-10). A follow-up investigation was carried out here in more contemporary high-risk men treated on Radiation Therapy Oncology Group 92-02 with STAD+RT or long-term AD+RT (LTAD+RT). EXPERIMENTAL DESIGN Adequate tissue was available to be analyzed immunohistochemically in 502 patients for Bcl-2 and 343 patients for Bax. Univariate and multivariate analyses by Cox proportional hazards models were applied to end points of failure. RESULTS Bcl-2 was positive in 45.6% cases, and Bax expression altered in 53.9% cases. Abnormal Bcl-2 was not related to any of the failure end points tested. Altered Bax expression was significantly associated with any failure (P = 0.023) and marginally with biochemical failure (P = 0.085). The combination of negative Bcl-2/normal Bax expression seemed more robust, being significantly related to reduced biochemical failure (P = 0.036) and any failure (P = 0.046). The predictive value of negative Bcl-2/normal Bax was most pronounced in those who received STAD+RT, as opposed to LTAD+RT. CONCLUSIONS Normal Bax expression was associated with significantly more favorable outcome. The combination of negative Bcl-2 and normal Bax was more consistently significant, particularly when STAD+RT was the treatment administered. These data suggest that LTAD+RT should be used when either Bcl-2 or Bax is abnormally expressed.
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Affiliation(s)
- Li Yan Khor
- Department of Radiation Oncology, Fox Chase Cancer Center
| | - Jennifer Moughan
- Department of Radiation Therapy Oncology Group, American College of Radiology, Philadelphia, Pennsylvania
| | | | - Elizabeth H. Hammond
- Department of Pathology, LDS Hospital, Intermountain Health Care, Salt Lake City, Utah
| | - Varagur Venkatesan
- Department of Radiation Oncology, University of Western Ontario, London, Ontario, Canada
| | - Seth A. Rosenthal
- Department of Radiological Associates of Sacramento Medical Group, Inc., Sacramento, California
| | - Mark A. Ritter
- Department of Radiation Oncology, University of Wisconsin, Madison, Wisconsin
| | - Howard M. Sandler
- Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan
| | | | - William U. Shipley
- Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Alan Pollack
- Department of Radiation Oncology, Fox Chase Cancer Center
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Hermann RM, Schwarten D, Fister S, Grundker C, Rave-Frank M, Nitsche M, Hille A, Thelen P, Schmidberger H, Christiansen H. No supra-additive effects of goserelin and radiotherapy on clonogenic survival of prostate carcinoma cells in vitro. Radiat Oncol 2007; 2:31. [PMID: 17718927 PMCID: PMC2034383 DOI: 10.1186/1748-717x-2-31] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2007] [Accepted: 08/26/2007] [Indexed: 11/13/2022] Open
Abstract
Background Oncological results of radiotherapy for locally advanced prostate cancer (PC) are significantly improved by simultaneous application of LHRH analoga (e.g. goserelin). As 85% of PC express LHRH receptors, we investigated the interaction of goserelin incubation with radiotherapy under androgen-deprived conditions in vitro. Methods LNCaP and PC-3 cells were stained for LHRH receptors. Downstream the LHRH receptor, changes in protein expression of c-fos, phosphorylated p38 and phosphorylated ERK1/2 were analyzed by means of Western blotting after incubation with goserelin and irradiation with 4 Gy. Both cell lines were incubated with different concentrations of goserelin in hormone-free medium. 12 h later cells were irradiated (0 – 4 Gy) and after 12 h goserelin was withdrawn. Endpoints were clonogenic survival and cell viability (12 h, 36 h and 60 h after irradiation). Results Both tested cell lines expressed LHRH-receptors. Changes in protein expression demonstrated the functional activity of goserelin in the tested cell lines. Neither in LNCaP nor in PC-3 any significant effects of additional goserelin incubation on clonogenic survival or cell viability for all tested concentrations in comparison to radiation alone were seen. Conclusion The clinically observed increase in tumor control after combination of goserelin with radiotherapy in PC cannot be attributed to an increase in radiosensitivity of PC cells by goserelin in vitro.
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Affiliation(s)
- Robert M Hermann
- Department of Radiotherapy, University hospital, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Dag Schwarten
- Department of Radiotherapy, University hospital, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Stefanie Fister
- Department of Gynecology, University hospital Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Carsten Grundker
- Department of Gynecology, University hospital Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Margret Rave-Frank
- Department of Radiotherapy, University hospital, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Mirko Nitsche
- Department of Radiotherapy, University hospital, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Andrea Hille
- Department of Radiotherapy, University hospital, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Paul Thelen
- Department of Urology, University hospital Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Heinz Schmidberger
- Department of Radiotherapy, University hospital, Langenbeckstr. 1, 55131 Mainz, Germany
| | - Hans Christiansen
- Department of Radiotherapy, University hospital, Robert-Koch-Str. 40, 37075 Göttingen, Germany
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Lai JC, Brown BD, Voskresenskiy AM, Vonhoff S, Klussman S, Tan W, Colombini M, Weeratna R, Miller P, Benimetskaya L, Stein CA. Comparison of d-g3139 and its enantiomer L-g3139 in melanoma cells demonstrates minimal in vitro but dramatic in vivo chiral dependency. Mol Ther 2007; 15:270-8. [PMID: 17235304 DOI: 10.1038/sj.mt.6300037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
G3139 (Genasense), an 18mer phosphorothioate antisense oligonucleotide targeted to the initiation codon region of the Bcl-2 messenger RNA (mRNA), downregulates Bcl-2 protein and mRNA expression in many cell lines. However, both the in vitro and in vivo mechanisms of action of G3139 are still uncertain. The isosequential L-deoxyribose enantiomer L-G3139, which does not downregulate Bcl-2 expression, was synthesized to study the role of the Bcl-2 protein in melanoma cells. Both D-G3139 and L-G3139 bind nonspecifically to basic fibroblast growth factor with approximately the same K(c), and cause highly effective inhibition of net formation in 518A2 melanoma cells on Matrigel. The uptakes of D-G3139 and L-G3139 in melanoma cells were also similar. However, unlike D-G3139, L-G3139 does not produce poly ADP-ribose polymerase-1 and procaspase-3 cleavage at 9.5 h after the initiation of the transfection, but can activate the intrinsic pathway of apoptosis at approximately 48 h. Furthermore, treatment of A375 melanoma human xenografts in severe combined immunodeficiency (SCID) mice demonstrates that tumor growth is not inhibited by L-G3139, whereas D-G3139 significantly inhibits the rate of tumor growth. Furthermore, the immunostimulatory properties of L-G3139 appear to be nil, which differs dramatically from those of D-G3139. In conclusion, profound differences exist between D-G3139 and L-G3139 in vivo despite their similarities in vitro.
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MESH Headings
- Animals
- Apoptosis/drug effects
- Cell Line, Tumor
- Cell Movement/drug effects
- Cytochromes c/metabolism
- Dose-Response Relationship, Drug
- Fibroblast Growth Factor 2/metabolism
- Flow Cytometry
- Humans
- Interleukin-12/metabolism
- Interleukin-16/metabolism
- Melanoma, Experimental/drug therapy
- Melanoma, Experimental/metabolism
- Melanoma, Experimental/pathology
- Mice
- Mice, Inbred BALB C
- Mice, SCID
- Microscopy, Phase-Contrast
- Mitochondria/drug effects
- Mitochondria/metabolism
- Oligonucleotides, Antisense/metabolism
- Oligonucleotides, Antisense/pharmacokinetics
- Oligonucleotides, Antisense/pharmacology
- Protein Binding
- Proto-Oncogene Proteins c-bcl-2/genetics
- Spleen/cytology
- Spleen/drug effects
- Spleen/metabolism
- Stereoisomerism
- Xenograft Model Antitumor Assays
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Affiliation(s)
- Johnathan C Lai
- Department of Biomedical Engineering, Columbia University, New York, New York, USA
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Wiedenmann N, Koto M, Raju U, Milas L, Mason KA. Modulation of tumor radiation response with G3139, a bcl-2 antisense oligonucleotide. Invest New Drugs 2007; 25:411-6. [PMID: 17492397 DOI: 10.1007/s10637-007-9058-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2007] [Accepted: 04/24/2007] [Indexed: 01/11/2023]
Abstract
Overexpression of anti-apoptotic bcl-2 protein has been found in hematological and solid tumors and has been associated with increased resistance against cytotoxic therapy. While bcl-2 antisense (AS) treatment combined with chemotherapy has been successfully tested in clinical trials, trials evaluating the combination of bcl-2 AS with radiotherapy have not yet been performed. The aim of this study was to investigate in vivo anti-tumor effects of a combined modality treatment scheme consisting of radiation and the bcl-2 targeted AS oligonucleotide (ODN) G3139 (Oblimersen Sodium). Two human colon carcinoma cell lines, SW620, bcl-2 positive and HT-29, bcl-2 negative, were grown as xenografts and compared in their response to combined bcl-2 AS/radiation treatment. G3139 potentiated the radiation response of bcl-2 positive SW620 tumors, but had no significant effect on bcl-2 negative HT-29 tumors assayed by tumor growth delay. The profound enhancement of SW620 tumor growth delay by G3139 did not translate into effects on tumor cure, as no significant effect of G3139 was found on SW620 radiocurability (TCD50 assay). The control ODN G3622 had no effect on SW620 radiation response, indicating an ODN sequence specific effect.
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Affiliation(s)
- Nicole Wiedenmann
- Department of Experimental Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Unit 066, Houston, TX 77030-4009, USA
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Anai S, Goodison S, Shiverick K, Hirao Y, Brown BD, Rosser CJ. Knock-down of Bcl-2 by antisense oligodeoxynucleotides induces radiosensitization and inhibition of angiogenesis in human PC-3 prostate tumor xenografts. Mol Cancer Ther 2007; 6:101-11. [PMID: 17237270 DOI: 10.1158/1535-7163.mct-06-0367] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Expression of the proto-oncogene Bcl-2 is associated with tumor progression. Bcl-2's broad expression in tumors, coupled with its role in resistance to chemotherapy and radiation therapy-induced apoptosis, makes it a rational target for anticancer therapy. Antisense Bcl-2 oligodeoxynucleotide (ODN) reagents have been shown to be effective in reducing Bcl-2 expression in a number of systems. We investigated whether treating human prostate cancer cells with antisense Bcl-2 ODN (G3139, oblimersen sodium, Genasense) before irradiation would render them more susceptible to radiation effects. Two prostate cancer cell lines expressing Bcl-2 at different levels (PC-3-Bcl-2 and PC-3-Neo) were subjected to antisense Bcl-2 ODN, reverse control (CTL), or mock treatment. Antisense Bcl-2 ODN alone produced no cytotoxic effects and was associated with G(1) cell cycle arrest. The combination of antisense Bcl-2 ODN with irradiation sensitized both cell lines to the killing effects of radiation. Both PC-3-Bcl-2 and PC-3-Neo xenografts in mice treated with the combination of antisense Bcl-2 ODN and irradiation were more than three times smaller by volume compared with xenografts in mice treated with reverse CTL alone, antisense Bcl-2 ODN alone, irradiation alone, or reverse CTL plus radiotherapy (P = 0.0001). Specifically, PC-3-Bcl-2 xenograft tumors treated with antisense Bcl-2 ODN and irradiation had increased rates of apoptosis and decreased rates of angiogenesis and proliferation. PC-3-Neo xenograft tumors had decreased proliferation only. This is the first study which shows that therapy directed at Bcl-2 affects tumor vasculature. Together, these findings warrant further study of this novel combination of Bcl-2 reduction and radiation therapy, as well as Bcl-2 reduction and angiogenic therapy.
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Affiliation(s)
- Satoshi Anai
- Department of Urology, College of Medicine, University of Florida, Suite N2-3, P.O. Box 100247, Gainesville, FL, USA
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