1
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Zhu X, Fan C, Xiong Z, Chen M, Li Z, Tao T, Liu X. Development and application of oncolytic viruses as the nemesis of tumor cells. Front Microbiol 2023; 14:1188526. [PMID: 37440883 PMCID: PMC10335770 DOI: 10.3389/fmicb.2023.1188526] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 05/18/2023] [Indexed: 07/15/2023] Open
Abstract
Viruses and tumors are two pathologies that negatively impact human health, but what occurs when a virus encounters a tumor? A global consensus among cancer patients suggests that surgical resection, chemotherapy, radiotherapy, and other methods are the primary means to combat cancer. However, with the innovation and development of biomedical technology, tumor biotherapy (immunotherapy, molecular targeted therapy, gene therapy, oncolytic virus therapy, etc.) has emerged as an alternative treatment for malignant tumors. Oncolytic viruses possess numerous anti-tumor properties, such as directly lysing tumor cells, activating anti-tumor immune responses, and improving the tumor microenvironment. Compared to traditional immunotherapy, oncolytic virus therapy offers advantages including high killing efficiency, precise targeting, and minimal side effects. Although oncolytic virus (OV) therapy was introduced as a novel approach to tumor treatment in the 19th century, its efficacy was suboptimal, limiting its widespread application. However, since the U.S. Food and Drug Administration (FDA) approved the first OV therapy drug, T-VEC, in 2015, interest in OV has grown significantly. In recent years, oncolytic virus therapy has shown increasingly promising application prospects and has become a major research focus in the field of cancer treatment. This article reviews the development, classification, and research progress of oncolytic viruses, as well as their mechanisms of action, therapeutic methods, and routes of administration.
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Affiliation(s)
- Xiao Zhu
- Zhejiang Provincial People's Hospital Affiliated to Hangzhou Medical College, Hangzhou Medical College, Hangzhou, China
- The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, China
- Department of Biological and Chemical Sciences, New York Institute of Technology—Manhattan Campus, New York, NY, United States
| | - Chenyang Fan
- Department of Clinical Medicine, Medicine and Technology, School of Zunyi Medical University, Zunyi, China
| | - Zhuolong Xiong
- The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, China
| | - Mingwei Chen
- The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, China
| | - Zesong Li
- Guangdong Provincial Key Laboratory of Systems Biology and Synthetic Biology for Urogenital Tumors, Shenzhen Key Laboratory of Genitourinary Tumor, Department of Urology, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital(Shenzhen Institute of Translational Medicine), Shenzhen, China
| | - Tao Tao
- Department of Gastroenterology, Zibo Central Hospital, Zibo, China
| | - Xiuqing Liu
- Department of Clinical Laboratory, Institute of Translational Medicine, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People’s Hospital, Shenzhen, China
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2
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Wang G, Liu Y, Liu S, Lin Y, Hu C. Oncolyic Virotherapy for Prostate Cancer: Lighting a Fire in Winter. Int J Mol Sci 2022; 23:ijms232012647. [PMID: 36293504 PMCID: PMC9603894 DOI: 10.3390/ijms232012647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/30/2022] [Accepted: 10/07/2022] [Indexed: 11/11/2022] Open
Abstract
As the most common cancer of the genitourinary system, prostate cancer (PCa) is a global men's health problem whose treatments are an urgent research issue. Treatment options for PCa include active surveillance (AS), surgery, endocrine therapy, chemotherapy, radiation therapy, immunotherapy, etc. However, as the cancer progresses, the effectiveness of treatment options gradually decreases, especially in metastatic castration-resistant prostate cancer (mCRPC), for which there are fewer therapeutic options and which have a shorter survival period and worse prognosis. For this reason, oncolytic viral therapy (PV), with its exceptional properties of selective tumor killing, relatively good safety in humans, and potential for transgenic delivery, has attracted increasing attention as a new form of anti-tumor strategy for PCa. There is growing evidence that OV not only kills tumor cells directly by lysis but can also activate anticancer immunity by acting on the tumor microenvironment (TME), thereby preventing tumor growth. In fact, evidence of the efficacy of this strategy has been observed since the late 19th century. However, subsequently, interest waned. The renewed interest in this therapy was due to advances in biotechnological methods and innovations at the end of the 20th century, which was also the beginning of PCa therapy with OV. Moreover, in combination with chemotherapy, radiotherapy, gene therapy or immunotherapy, OV viruses can have a wide range of applications and can provide an effective therapeutic result in the treatment of PCa.
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Affiliation(s)
- Gongwei Wang
- Department of Urology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - Ying Liu
- Department of Infectious Diseases, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - Shuoru Liu
- Department of Urology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - Yuan Lin
- Department of Pharmacology, Sun Yat-sen University, Guangzhou 528478, China
| | - Cheng Hu
- Department of Urology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
- Correspondence:
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Zhao Y, Liu Z, Li L, Wu J, Zhang H, Zhang H, Lei T, Xu B. Oncolytic Adenovirus: Prospects for Cancer Immunotherapy. Front Microbiol 2021; 12:707290. [PMID: 34367111 PMCID: PMC8334181 DOI: 10.3389/fmicb.2021.707290] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 06/21/2021] [Indexed: 12/31/2022] Open
Abstract
Immunotherapy has moved to the forefront of modern oncologic treatment in the past few decades. Various forms of immunotherapy currently are emerging, including oncolytic viruses. In this therapy, viruses are engineered to selectively propagate in tumor cells and reduce toxicity for non-neoplastic tissues. Adenovirus is one of the most frequently employed oncolytic viruses because of its capacity in tumor cell lysis and immune response stimulation. Upregulation of immunostimulatory signals induced by oncolytic adenoviruses (OAds) might significantly remove local immune suppression and amplify antitumor immune responses. Existing genetic engineering technology allows us to design OAds with increasingly better tumor tropism, selectivity, and antitumor efficacy. Several promising strategies to modify the genome of OAds have been applied: capsid modifications, small deletions in the pivotal viral genes, insertion of tumor-specific promoters, and addition of immunostimulatory transgenes. OAds armed with tumor-associated antigen (TAA) transgenes as cancer vaccines provide additional therapeutic strategies to trigger tumor-specific immunity. Furthermore, the combination of OAds and immune checkpoint inhibitors (ICIs) increases clinical benefit as evidence shown in completed and ongoing clinical trials, especially in the combination of OAds with antiprogrammed death 1/programed death ligand 1 (PD-1/PD-L1) therapy. Despite remarkable antitumor potency, oncolytic adenovirus immunotherapy is confronted with tough challenges such as antiviral immune response and obstruction of tumor microenvironment (TME). In this review, we focus on genomic modification strategies of oncolytic adenoviruses and applications of OAds in cancer immunotherapy.
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Affiliation(s)
- Yaqi Zhao
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Zheming Liu
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Lan Li
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Jie Wu
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Huibo Zhang
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Haohan Zhang
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Tianyu Lei
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
| | - Bin Xu
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China
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4
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Watkinson F, Nayar SK, Rani A, Sakellariou CA, Elhage O, Papaevangelou E, Dasgupta P, Galustian C. IL-15 Upregulates Telomerase Expression and Potently Increases Proliferative Capacity of NK, NKT-Like, and CD8 T Cells. Front Immunol 2021; 11:594620. [PMID: 33537030 PMCID: PMC7848219 DOI: 10.3389/fimmu.2020.594620] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 12/02/2020] [Indexed: 11/13/2022] Open
Abstract
Interleukin-15 (IL-15) is a cytokine that has been shown to expand CD8 T cell and natural killer (NK) cell populations, and therefore has potential for potentiating adoptive immune cell therapy for cancer. Previously, IL-15 has been shown to induce proliferation of CD8 memory T cells through activation of telomerase. Here, we investigated whether telomerase is also activated during the IL-15 mediated proliferation of NK and NKT-like (CD56+CD3+) cells. We also examined the extent that each of the three signaling pathways known to be stimulated by IL-2/IL-15 (JAK-STAT, PI3K-AKT Ras-RAF/MAPK) were activated and involved in the telomerase expression in the three cell types NK, NKT, or CD8 T cells. To assess cell proliferation and doubling, peripheral blood mononuclear cells (PBMCs) or isolated NK, NKT-like or CD8 T cells were incubated with varying concentrations of IL-15 or IL-2 for 7 days. CD8 T, NK, and NKT cell expansion was determined by fluorophore-conjugated antibody staining and flow cytometry. Cell doubling was investigated using carboxyfluorescein-succinimidyl-ester (CFSE). Telomerase expression was investigated by staining cells with anti-telomerase reverse transcriptase (anti-TERT). Telomerase activity in CD56+ and CD8 T cells was also measured via Telomerase Repeat Amplification Protocol (TRAP). Analysis of cellular expansion, proliferation and TERT expression concluded that IL-15 increased cellular growth of NK, NKT, and CD8 T cells more effectively than IL-2 using low or high doses. IL-15, increased TERT expression in NK and NKT cells by up to 2.5 fold, the same increase seen in CD8 T cells. IL-2 had effects on TERT expression only at high doses (100–1000 ng/ml). Proteome profiling identified that IL-15 activated selected signaling proteins in the three pathways (JAK-STAT, PI3K-AKT, Ras-MAPK) known to mediate IL-2/IL-15 signaling, more strongly than IL-2. Evaluation by signaling pathway inhibitors revealed that JAK/STAT and PI3K/AKT pathways are important in IL-15’s ability to upregulate TERT expression in NK and NKT cells, whereas all three pathways were involved in CD8 T cell TERT expression. In conclusion, this study shows that IL-15 potently stimulates TERT upregulation in NK and NKT cells in addition to CD8 T cells and is therefore a valuable tool for adoptive cell therapies.
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Affiliation(s)
- Fiona Watkinson
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom
| | - Sandeep Krishan Nayar
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom
| | - Aradhana Rani
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom
| | - Christina A Sakellariou
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom
| | - Oussama Elhage
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom.,Urology Centre, Guy's Hospital, London, United Kingdom
| | - Efthymia Papaevangelou
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom
| | - Prokar Dasgupta
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom.,Urology Centre, Guy's Hospital, London, United Kingdom
| | - Christine Galustian
- Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences & Medicine, King's College London, Guy's Hospital, London, United Kingdom
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5
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Taguchi S, Fukuhara H, Todo T. Oncolytic virus therapy in Japan: progress in clinical trials and future perspectives. Jpn J Clin Oncol 2019; 49:201-209. [PMID: 30462296 DOI: 10.1093/jjco/hyy170] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 09/21/2018] [Indexed: 01/28/2023] Open
Abstract
Oncolytic virus therapy is a promising new option for cancer. It utilizes genetically engineered or naturally occurring viruses that selectively replicate in and kill cancer cells without harming normal cells. T-VEC (talimogene laherparepvec), a second-generation oncolytic herpes simplex virus type 1, was approved by the US Food and Drug Administration for the treatment of inoperable melanoma in 2015 and subsequently approved in Europe in 2016. Other oncolytic viruses using different parental viruses have also been tested in Phase III clinical trials and are ready for drug approval: Pexa-Vec (pexastimogene devacirepvec), an oncolytic vaccinia virus, CG0070, an oncolytic adenovirus, and REOLYSIN (pelareorep), an oncolytic reovirus. In Japan, as of May 2018, several oncolytic viruses have been developed, and some have already proceeded to clinical trials. In this review, we summarize clinical trials assessing oncolytic virus therapy that were conducted or are currently ongoing in Japan, specifically, T-VEC, the abovementioned oncolytic herpes simplex virus type 1, G47Δ, a third-generation oncolytic herpes simplex virus type 1, HF10, a naturally attenuated oncolytic herpes simplex virus type 1, Telomelysin, an oncolytic adenovirus, Surv.m-CRA, another oncolytic adenovirus, and Sendai virus particle. In the near future, oncolytic virus therapy may become an important and major treatment option for cancer in Japan.
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Affiliation(s)
- Satoru Taguchi
- Department of Urology, Kyorin University Faculty of Medicine, Tokyo, Japan
| | - Hiroshi Fukuhara
- Department of Urology, Kyorin University Faculty of Medicine, Tokyo, Japan
| | - Tomoki Todo
- Division of Innovative Cancer Therapy, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
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Song JH, Kang HJ, Luevano LA, Gokhale V, Wu K, Pandey R, Sherry Chow HH, Hurley LH, Kraft AS. Small-Molecule-Targeting Hairpin Loop of hTERT Promoter G-Quadruplex Induces Cancer Cell Death. Cell Chem Biol 2019; 26:1110-1121.e4. [PMID: 31155510 PMCID: PMC6713458 DOI: 10.1016/j.chembiol.2019.04.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 01/28/2019] [Accepted: 04/16/2019] [Indexed: 12/23/2022]
Abstract
Increased telomerase activity is associated with malignancy and poor prognosis in human cancer, but the development of targeted agents has not yet provided clinical benefit. Here we report that, instead of targeting the telomerase enzyme directly, small molecules that bind to the G-hairpin of the hTERT G-quadruplex-forming sequence kill selectively malignant cells without altering the function of normal cells. RG260 targets the hTERT G-quadruplex stem-loop folding but not tetrad DNAs, leading to downregulation of hTERT expression. To improve physicochemical and pharmacokinetic properties, we derived a small-molecule analog, RG1603, from the parent compound. RG1603 induces mitochondrial defects including PGC1α and NRF2 inhibition and increases oxidative stress, followed by DNA damage and apoptosis. RG1603 injected as a single agent has tolerable toxicity while achieving strong anticancer efficacy in a tumor xenograft mouse model. These results demonstrate a unique approach to inhibiting the hTERT that functions by impairing mitochondrial activity, inducing cell death.
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Affiliation(s)
- Jin H Song
- Department of Cellular and Molecular Medicine, University of Arizona, 1515 North Campbell Avenue, Tucson, AZ 85724, USA; University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA.
| | - Hyun-Jin Kang
- College of Pharmacy, University of Arizona, 1703 East Mabel Street, Tucson, AZ 85721, USA; Reglagene LLC, 1703 East Mabel Street, Tucson, AZ 85721, USA
| | - Libia A Luevano
- University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA
| | - Vijay Gokhale
- Reglagene LLC, 1703 East Mabel Street, Tucson, AZ 85721, USA; BIO5 Institute, University of Arizona, 1657 East Helen Street, Tucson, AZ 85721, USA
| | - Kui Wu
- College of Pharmacy, University of Arizona, 1703 East Mabel Street, Tucson, AZ 85721, USA
| | - Ritu Pandey
- Department of Cellular and Molecular Medicine, University of Arizona, 1515 North Campbell Avenue, Tucson, AZ 85724, USA; University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA
| | - H-H Sherry Chow
- University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA
| | - Laurence H Hurley
- College of Pharmacy, University of Arizona, 1703 East Mabel Street, Tucson, AZ 85721, USA; Reglagene LLC, 1703 East Mabel Street, Tucson, AZ 85721, USA.
| | - Andrew S Kraft
- University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA.
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7
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Systemic Management for Advanced Hepatocellular Carcinoma: A Review of the Molecular Pathways of Carcinogenesis, Current and Emerging Therapies, and Novel Treatment Strategies. Dig Dis Sci 2019; 64:1016-1029. [PMID: 30887150 DOI: 10.1007/s10620-019-05582-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hepatocellular carcinoma (HCC) arises from a number of cirrhosis-related and non-cirrhosis-related exposures and is one of the leading causes of cancer-related deaths worldwide. Achieving a durable cure currently relies on either resection or transplantation, but since most patients will be diagnosed with inoperable disease, there is great interest in achieving more effective systemic therapies. At a molecular level, HCC is heterogeneous, but initial treatment strategies, including the use of multi-targeted tyrosine kinase inhibitors and checkpoint inhibitors, have been fairly homogenous, depending on general host factors and overall tumor burden rather than specific molecular signatures. Over the past 2 decades, however, there has been significant success in identifying key molecular targets, including driver mutations involving the telomerase reverse transcriptase, p53, and beta-catenin genes, and significant work is now being devoted to translating these discoveries into the development of robust and well-tolerated targeted therapies. Furthermore, multi-modal therapies have also begun to emerge, harnessing possible synergism amongst a variety of different treatment classes. As the findings of these landmark trials become available over the next several years, the landscape of the systemic management of advanced HCC will change significantly.
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Zhang X, Li B, Yu J, Dahlström J, Tran AN, Björkholm M, Xu D. MYC-dependent downregulation of telomerase by FLT3 inhibitors is required for their therapeutic efficacy on acute myeloid leukemia. Ann Hematol 2017; 97:63-72. [PMID: 29080039 PMCID: PMC5748426 DOI: 10.1007/s00277-017-3158-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 10/10/2017] [Indexed: 11/24/2022]
Abstract
The somatic mutation of FLT3 occurs in 30% of acute myeloid leukemia (AML), with the majority of mutations exhibiting internal tandem duplication (ITD). On the other hand, the induction of telomerase reverse transcriptase (hTERT) and the activation of telomerase is a key step in AML development. Here, we sought to determine whether FLT3ITD regulates hTERT expression in AML cells and whether hTERT expression affects FLT3 inhibitors' therapeutic efficacy on AML. FLT3ITD-harboring AML cell lines and primary cells treated with the FLT3 inhibitor PKC412 displayed a rapid decline in the levels of hTERT mRNA and telomerase activity. Moreover, PKC412 inhibited hTERT gene transcription in a c-MYC-dependent manner. The ectopic expression of hTERT significantly attenuated the apoptotic effect of PKC412 on AML cells. Mechanistically, hTERT enhanced the activity of FLT3 downstream effectors or alternative RTK signaling, thereby enhancing AKT phosphorylation, in AML cells treated with PKC412. Collectively, PKC412 downregulates hTERT expression and telomerase activity in a MYC-dependent manner and this effect is required for its optimal anti-AML efficacy, while hTERT over-expression confers AML cells resistance to a targeted therapeutic agent PKC412. These findings suggest that the functional interplay between FLT3ITD and hTERT contributes to the AML pathogenesis and interferes with the efficacy of FLT3ITD-targeted therapy.
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Affiliation(s)
- Xiaolu Zhang
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Bingnan Li
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Jingya Yu
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Jenny Dahlström
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Anh Nhi Tran
- Department of Clinical Genetics, Karolinska University Hospital and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Magnus Björkholm
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden
| | - Dawei Xu
- Center for Hematology, Department of Medicine and Center for Molecular Medicine, Karolinska University Hospital Solna and Karolinska Institutet, SE-171 76, Stockholm, Sweden.
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9
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Cai Z, Lv H, Cao W, Zhou C, Liu Q, Li H, Zhou F. Targeting strategies of adenovirus‑mediated gene therapy and virotherapy for prostate cancer (Review). Mol Med Rep 2017; 16:6443-6458. [PMID: 28901490 PMCID: PMC5865813 DOI: 10.3892/mmr.2017.7487] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 07/11/2017] [Indexed: 02/05/2023] Open
Abstract
Prostate cancer (PCa) poses a high risk to older men and it is the second most common type of male malignant tumor in western developed countries. Additionally, there is a lack of effective therapies for PCa at advanced stages. Novel treatment strategies such as adenovirus-mediated gene therapy and virotherapy involve the expression of a specific therapeutic gene to induce death in cancer cells, however, wild-type adenoviruses are also able to infect normal human cells, which leads to undesirable toxicity. Various PCa-targeting strategies in adenovirus-mediated therapy have been developed to improve tumor-targeting effects and human safety. The present review summarizes the relevant knowledge regarding available adenoviruses and PCa-targeting strategies. In addition, future directions in this area are also discussed. In conclusion, although they remain in the early stages of basic research, adenovirus-mediated gene therapy and virotherapy are expected to become important therapies for tumors in the future due to their potential targeting strategies.
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Affiliation(s)
- Zhonglin Cai
- Department of Urology, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, Gansu 730050, P.R. China
| | - Haidi Lv
- Department of Urology, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, Gansu 730050, P.R. China
| | - Wenjuan Cao
- Department of Urology, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, Gansu 730050, P.R. China
| | - Chuan Zhou
- Department of Urology, West China Hospital of Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Qiangzhao Liu
- Department of Urology, Lanzhou University Second Hospital, Lanzhou, Gansu 730000, P.R. China
| | - Hui Li
- Department of Neurosurgery, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, Gansu 730050, P.R. China
| | - Fenghai Zhou
- Department of Urology, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, Gansu 730050, P.R. China
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10
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Abstract
Aberrations in telomere biology are among the earliest events in prostate cancer tumorigenesis and continue during tumour progression. Substantial telomere shortening occurs in prostate cancer cells and high-grade prostatic intraepithelial neoplasia. Not all mechanisms of telomere shortening are understood, but oxidative stress from local inflammation might accelerate prostatic telomere loss. Critically short telomeres can drive the accumulation of tumour-promoting genomic alterations; however, continued telomere erosion is unsustainable and must be mitigated to ensure cancer cell survival and unlimited replication potential. Prostate cancers predominantly maintain telomeres by activating telomerase, but alternative mechanisms of telomere extension can occur in metastatic disease. Telomerase activity and telomere length assessment might be useful in prostate cancer diagnosis and prognosis. Telomere shortening in normal stromal cells has been associated with prostate cancer, whereas variable telomere lengths in prostate cancer cells and telomere shortening in cancer-associated stromal cells correlated with lethal disease. Single-agent telomerase-targeted treatments for solid cancers were ineffective in clinical trials but have not been investigated in prostate cancer and might be useful in combination with established regimens. Telomere-directed strategies have not been explored as extensively. Telomere deprotection strategies have the advantage of being effective in both telomerase-dependent and telomerase-independent cancers. Disruption of androgen receptor function in prostate cancer cells results in telomere dysfunction, indicating telomeres and telomerase as potential therapeutic targets in prostate cancer.
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11
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Zafar S, Parviainen S, Siurala M, Hemminki O, Havunen R, Tähtinen S, Bramante S, Vassilev L, Wang H, Lieber A, Hemmi S, de Gruijl T, Kanerva A, Hemminki A. Intravenously usable fully serotype 3 oncolytic adenovirus coding for CD40L as an enabler of dendritic cell therapy. Oncoimmunology 2016; 6:e1265717. [PMID: 28344872 DOI: 10.1080/2162402x.2016.1265717] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 11/18/2016] [Accepted: 11/21/2016] [Indexed: 01/01/2023] Open
Abstract
Vaccination with dendritic cells (DCs), the most potent professional antigen-presenting cells in the body, is a promising approach in cancer immunotherapy. However, tumors induce immunosuppression in their microenvironment that suppresses and impairs the function of DCs. Therefore, human clinical trials with DC therapy have often been disappointing. To improve the therapeutic efficacy and to overcome the major obstacles of DC therapy, we generated a novel adenovirus, Ad3-hTERT-CMV-hCD40L, which is fully serotype 3 and expresses hCD40L for induction of antitumor immune response. The specific aim is to enhance DCs function. Data from a human cancer patient indicated that this capsid allows effective transduction of distant tumors through the intravenous route. Moreover, patient data suggested that virally produced hCD40L can activate DCs in situ. The virus was efficient in vitro and had potent antitumor activity in vivo. In a syngeneic model, tumors treated with Ad5/3-CMV-mCD40L virus plus DCs elicited greater antitumor effect as compared with either treatment alone. Moreover, virally coded CD40L induced activation of DCs, which in turn, lead to the induction of a Th1 immune response and increased tumor-specific T cells. In conclusion, Ad3-hTERT-CMV-hCD40L is promising for translation into human trials. In particular, this virus could enable successful dendritic cell therapy in cancer patients.
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Affiliation(s)
- Sadia Zafar
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki , Helsinki, Finland
| | - Suvi Parviainen
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki, Helsinki, Finland; TILT Biotherapeutics Ltd, Helsinki, Finland
| | - Mikko Siurala
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki, Helsinki, Finland; TILT Biotherapeutics Ltd, Helsinki, Finland
| | - Otto Hemminki
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki , Helsinki, Finland
| | - Riikka Havunen
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki , Helsinki, Finland
| | - Siri Tähtinen
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki , Helsinki, Finland
| | - Simona Bramante
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki , Helsinki, Finland
| | - Lotta Vassilev
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki , Helsinki, Finland
| | - Hongjie Wang
- Division of Medical Genetics, University of Washington , Seattle, WA, USA
| | - Andre Lieber
- Division of Medical Genetics, University of Washington, Seattle, WA, USA; Department of Pathology, University of Washington, Seattle, WA, USA
| | - Silvio Hemmi
- Institute of Molecular Life Sciences, University of Zurich , Zurich, Switzerland
| | | | - Anna Kanerva
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki, Helsinki, Finland; Department of Obstetrics and Gynecology, Helsinki University Central Hospital, Helsinki, Finland
| | - Akseli Hemminki
- Cancer Gene Therapy Group, Department of Oncology, University of Helsinki, Helsinki, Finland; TILT Biotherapeutics Ltd, Helsinki, Finland; Helsinki University Comprehensive Cancer Center, Helsinki, Finland
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12
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Chen GX, Zhang S, He XH, Liu SY, Ma C, Zou XP. Clinical utility of recombinant adenoviral human p53 gene therapy: current perspectives. Onco Targets Ther 2014; 7:1901-9. [PMID: 25364261 PMCID: PMC4211860 DOI: 10.2147/ott.s50483] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Gene therapy has promised to be a highly effective antitumor treatment by introducing a tumor suppressor gene or the abrogation of an oncogene. Among the potential therapeutic transgenes, the tumor suppressor gene p53 serves as an attractive target. Restoration of wild-type p53 function in tumors can be achieved by introduction of an intact complementary deoxyribonucleic acid copy of the p53 gene using a suitable viral vector, in most cases an adenoviral vector (Adp53). Preclinical in vitro and in vivo studies have shown that Adp53 triggers a dramatic tumor regression response in various cancers. These viruses are engineered to lack certain early proteins and are thus replication defective, including Gendicine, SCH-58500, and Advexin. Several types of tumor-specific p53-expressing conditionally replicating adenovirus vectors (known as replication-competent CRAdp53 vectors) have been developed, such as ONYX 015, AdDelta24-p53, SG600-p53, OBP-702, and H101. Various clinical trials have been conducted to investigate the safety and efficiency of these adenoviral vectors. In this review we will talk about the biological mechanisms, clinical utility, and therapeutic potentials of the replication-deficient Adp53-based and replication-competent CRAdp53-based gene therapy.
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Affiliation(s)
- Guang-Xia Chen
- Department of Gastroenterology, First People's Hospital of Xuzhou, Xuzhou, Jiangsu Province, People's Republic of China
| | - Shu Zhang
- Department of Gastroenterology, Drum Tower Hospital, Nanjing, People's Republic of China ; Medical School of Nanjing University, Nanjing, People's Republic of China ; Jiangsu Clinical Medical Center of Digestive Disease, Nanjing, People's Republic of China
| | - Xiao-Hua He
- Department of Gastroenterology, First People's Hospital of Xuzhou, Xuzhou, Jiangsu Province, People's Republic of China
| | - Shi-Yu Liu
- Department of Gastroenterology, First People's Hospital of Xuzhou, Xuzhou, Jiangsu Province, People's Republic of China
| | - Chao Ma
- Department of Gastroenterology, Drum Tower Hospital, Nanjing, People's Republic of China ; Medical School of Nanjing University, Nanjing, People's Republic of China ; Jiangsu Clinical Medical Center of Digestive Disease, Nanjing, People's Republic of China
| | - Xiao-Ping Zou
- Department of Gastroenterology, Drum Tower Hospital, Nanjing, People's Republic of China ; Medical School of Nanjing University, Nanjing, People's Republic of China ; Jiangsu Clinical Medical Center of Digestive Disease, Nanjing, People's Republic of China
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13
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Telomerase and the search for the end of cancer. Trends Mol Med 2013; 19:125-33. [DOI: 10.1016/j.molmed.2012.11.006] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2012] [Revised: 11/11/2012] [Accepted: 11/16/2012] [Indexed: 12/30/2022]
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14
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Lin WH, Yeh SH, Yang WJ, Yeh KH, Fujiwara T, Nii A, Chang SSC, Chen PJ. Telomerase-specific oncolytic adenoviral therapy for orthotopic hepatocellular carcinoma in HBx transgenic mice. Int J Cancer 2012; 132:1451-62. [PMID: 22886913 DOI: 10.1002/ijc.27770] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 07/18/2012] [Indexed: 12/27/2022]
Abstract
The telomerase-specific replication-competent oncolytic adenovirus, Telomelysin, was developed for virus-mediated preferential lysis of tumor cells. Its selectivity is derived from a human telomerase reverse transcriptase (hTERT) promoter-driven active viral replication, which occurs in cancer cells with high telomerase activity but not in normal cells lacking such activity. Because the TERT activity is elevated in most cases of hepatocellular carcinoma (HCC), the current study aims to investigate whether Telomelysin can be used for treatment of HCC. The oncolytic effect of Telomelysin has been investigated both in vitro using cell culture and in vivo using an immunocompetent in situ orthotopic HCC model. In this model, HCC developed spontaneously in the liver of HBx transgenic mice, which is pathologically and genetically similar to human HCC. In cell culture assay, Telomelysin lyses HCC cell lines at a low multiplicity of infection (MOI), ranging 0.77-6.35 (MOI [PFU/cell]). In the orthotopic HCC model, Telomelysin showed a potent oncolytic effect on HCC but spared normal liver tissue. Dose escalation analysis identified a safety dose of 1.25 × 10(8) PFU for this model. The effect of multiple injections of Telomelysin was also evaluated in this immunocompetent HCC model. We found that the virus replicates in HCC after a second intratumoral injection despite an immune response induced by the previous injection. This preclinical study shows that Telomelysin can be used for treatment of human HCC at an appropriate dosage and that its tumor-killing activity persists after multiple injections.
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Affiliation(s)
- Wei-Hsiang Lin
- Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan
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15
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Mishra J, Drummond J, Quazi SH, Karanki SS, Shaw JJ, Chen B, Kumar N. Prospective of colon cancer treatments and scope for combinatorial approach to enhanced cancer cell apoptosis. Crit Rev Oncol Hematol 2012; 86:232-50. [PMID: 23098684 DOI: 10.1016/j.critrevonc.2012.09.014] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Revised: 09/03/2012] [Accepted: 09/26/2012] [Indexed: 02/07/2023] Open
Abstract
Colorectal cancer is the leading cause of cancer-related mortality in the western world. It is also the third most common cancer diagnosed in both men and women in the United States with a recent estimate for new cases of colorectal cancer in the year 2012 being around 103,170. Various risk factors for colorectal cancer include life-style, diet, age, personal and family history, and racial and ethnic background. While a few cancers are certainly preventable but this does not hold true for colon cancer as it is often detected in its advanced stage and generally not diagnosed until symptoms become apparent. Despite the fact that several options are available for treating this cancer through surgery, chemotherapy, radiation therapy, immunotherapy, and nutritional-supplement therapy, but the success rates are not very encouraging when used alone where secondary complications appear in almost all these therapies. To maximize the therapeutic-effects in patients, combinatorial approaches are essential. In this review we have discussed the therapies previously and currently available to patients diagnosed with colorectal-cancer, focus on some recent developments in basic research that has shaded lights on new therapeutic-concepts utilizing macrophages/dendritic cells, natural killer cells, gene delivery, siRNA-, and microRNA-technology, and specific-targeting of tyrosine kinases that are either mutated or over-expressed in the cancerous cell to treat these cancer. Potential strategies are discussed where these concepts could be applied to the existing therapies under a comprehensive approach to enhance the therapeutic effects.
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Affiliation(s)
- Jayshree Mishra
- Department of Pharmaceutical Sciences, College of Pharmacy, Texas A&M Health Science Center, Kingsville, TX 78363, USA
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16
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Rajecki M, Sarparanta M, Hakkarainen T, Tenhunen M, Diaconu I, Kuhmonen V, Kairemo K, Kanerva A, Airaksinen AJ, Hemminki A. SPECT/CT imaging of hNIS-expression after intravenous delivery of an oncolytic adenovirus and 131I. PLoS One 2012; 7:e32871. [PMID: 22412937 PMCID: PMC3296755 DOI: 10.1371/journal.pone.0032871] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 02/01/2012] [Indexed: 12/17/2022] Open
Abstract
Oncolytic adenoviruses can be engineered for better tumor selectivity, gene delivery and be armed for imaging and concentrating radionuclides into tumors for synergistic oncolysis. We constructed Ad5/3-hTERT-hNIS where replication is controlled by hTERT-promoter. Ad5/3-hTERT-hNIS expresses hNIS for imaging of transgene expression and for treatment of infected tumors by radioiodine. Ad5/3-hTERT-hNIS efficiently killed prostate cancer cells and induced iodine uptake in vitro and in vivo after intratumoral virus administration. Survival of mice treated with intravenous Ad5/3-hTERT-hNIS significantly prolonged survival over mock or radioiodine only but the combination of virus with radioiodine was not more effective than virus alone. Temporal and spatial changes in hNIS-expression during therapy were detected with SPECT, demonstrating feasibility of evaluation of the combination therapy with hNIS-expressing adenoviruses and radioiodide.
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Affiliation(s)
- Maria Rajecki
- Cancer Gene Therapy Group, Molecular Cancer Biology Program, Haartman Institute, Transplantation Laboratory and Finnish Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
- HUSLAB, Helsinki University Central Hospital, Helsinki, Finland
| | - Mirkka Sarparanta
- Laboratory of Radiochemistry, University of Helsinki, Helsinki, Finland
| | - Tanja Hakkarainen
- Cancer Gene Therapy Group, Molecular Cancer Biology Program, Haartman Institute, Transplantation Laboratory and Finnish Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
- HUSLAB, Helsinki University Central Hospital, Helsinki, Finland
| | - Mikko Tenhunen
- Department of Oncology, Helsinki University Central Hospital, Helsinki, Finland
| | - Iulia Diaconu
- Cancer Gene Therapy Group, Molecular Cancer Biology Program, Haartman Institute, Transplantation Laboratory and Finnish Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
- HUSLAB, Helsinki University Central Hospital, Helsinki, Finland
| | - Venla Kuhmonen
- Laboratory of Radiochemistry, University of Helsinki, Helsinki, Finland
| | - Kalevi Kairemo
- Department of Oncology, Helsinki University Central Hospital, Helsinki, Finland
- International Comprehensive Cancer Center Docrates, Helsinki, Finland
| | - Anna Kanerva
- Cancer Gene Therapy Group, Molecular Cancer Biology Program, Haartman Institute, Transplantation Laboratory and Finnish Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
- HUSLAB, Helsinki University Central Hospital, Helsinki, Finland
- Department of Obstetrics and Gynecology, Helsinki University Central Hospital, Helsinki, Finland
| | - Anu J. Airaksinen
- Laboratory of Radiochemistry, University of Helsinki, Helsinki, Finland
| | - Akseli Hemminki
- Cancer Gene Therapy Group, Molecular Cancer Biology Program, Haartman Institute, Transplantation Laboratory and Finnish Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
- HUSLAB, Helsinki University Central Hospital, Helsinki, Finland
- * E-mail:
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17
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Hemminki O, Bauerschmitz G, Hemmi S, Lavilla-Alonso S, Diaconu I, Guse K, Koski A, Desmond RA, Lappalainen M, Kanerva A, Cerullo V, Pesonen S, Hemminki A. Oncolytic adenovirus based on serotype 3. Cancer Gene Ther 2010; 18:288-96. [PMID: 21183947 DOI: 10.1038/cgt.2010.79] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Oncolytic adenoviruses have been safe in clinical trials but the efficacy has been mostly limited. All published trials have been performed with serotype 5 based viruses. The expression level of the Ad5 receptor CAR may be variable in advanced tumors. In contrast, the Ad3 receptor remains unclear, but is known to be abundantly expressed in most tumors. Therefore, we hypothesized that a fully serotype 3 oncolytic adenovirus might be useful for treating cancer. Patients exposed to adenoviruses develop high titers of serotype-specific neutralizing antibodies, which might compromise re-administration. Thus, having different serotype oncolytic viruses available might facilitate repeated dosing in humans. Ad3-hTERT-E1A is a fully serotype 3 oncolytic adenovirus controlled by the promoter of the catalytic domain of human telomerase. It was effective in vitro on cell lines representing seven major cancer types, although low toxicity was seen in non-malignant cells. In vivo, the virus had anti-tumor efficacy in three different animal models. Although in vitro oncolysis mediated by Ad3-hTERT-E1A and wild-type Ad3 occurred more slowly than with Ad5 or Ad5/3 (Ad3 fiber knob in Ad5) based viruses, in vivo the virus was at least as potent as controls. Anti-tumor efficacy was retained in presence of neutralizing anti-Ad5 antibodies whereas Ad5 based controls were blocked. In summary, we report generation of a non-Ad5 based oncolytic adenovirus, which might be useful for testing in cancer patients, especially in the context of high anti-Ad5 neutralizing antibodies.
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Affiliation(s)
- O Hemminki
- Cancer Gene Therapy Group, Molecular Cancer Biology Program and Haartman Institute and Transplantation Laboratory and Finnish Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland
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18
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Toth K, Kuppuswamy M, Shashkova EV, Spencer JF, Wold WSM. A fully replication-competent adenovirus vector with enhanced oncolytic properties. Cancer Gene Ther 2010; 17:761-70. [PMID: 20596091 DOI: 10.1038/cgt.2010.33] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We have studied the oncolytic efficacy of two adenovirus vectors named KD3 and INGN 007, which differ from each other only in that whereas KD3 has two small deletions in its e1a gene that restrict its replication to rapidly cycling cells, INGN 007 has wild-type e1a gene. Both vectors overexpress the adenovirus death protein (ADP). Both KD3 and INGN 007 effectively suppressed the growth of subcutaneous human A549 and Hep3B tumors in nude mice upon intratumoral injection, and contained the growth of subcutaneous LNCaP tumors after intravenous injection, making some tumors shrink or disappear. However, in a more demanding model, intravenous injections of neither KD3 nor wild-type Ad5 were effective against subcutaneous A549 tumors, whereas INGN 007 increased the mean survival time by 35%. INGN 007 was also effective in suppressing tumor growth in a challenging A549 orthotopic lung cancer model. INGN 007 was superior to dl1520 (ONYX-015) in repressing subcutaneous A549 tumors. Our results suggest that vectors such as INGN 007 might provide better antitumor efficacy in the clinic as well.
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Affiliation(s)
- K Toth
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St Louis, MO 63104, USA
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19
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Huang P, Kaku H, Chen J, Kashiwakura Y, Saika T, Nasu Y, Urata Y, Fujiwara T, Watanabe M, Kumon H. Potent antitumor effects of combined therapy with a telomerase-specific, replication-competent adenovirus (OBP-301) and IL-2 in a mouse model of renal cell carcinoma. Cancer Gene Ther 2010; 17:484-91. [DOI: 10.1038/cgt.2010.5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Singh P, Yam M, Russell PJ, Khatri A. Molecular and traditional chemotherapy: a united front against prostate cancer. Cancer Lett 2010; 293:1-14. [PMID: 20117879 DOI: 10.1016/j.canlet.2009.11.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2009] [Revised: 11/23/2009] [Accepted: 11/27/2009] [Indexed: 01/28/2023]
Abstract
Castrate resistant prostate cancer (CRPC) is essentially incurable. Recently though, chemotherapy demonstrated a survival benefit ( approximately 2months) in the treatment of CRPC. While this was a landmark finding, suboptimal efficacy and systemic toxicities at the therapeutic doses warranted further development. Smart combination therapies, acting through multiple mechanisms to target the heterogeneous cell populations of PC and with potential for reduction in individual dosing, need to be developed. In that, targeted molecular chemotherapy has generated significant interest with the potential for localized treatment to generate systemic efficacy. This can be further enhanced through the use of oncolytic conditionally replicative adenoviruses (CRAds) to deliver molecular chemotherapy. The prospects of chemotherapy and molecular-chemotherapy as single and as components of combination therapies are discussed.
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Affiliation(s)
- P Singh
- Centre for Medicine and Oral Health, Griffith University - Gold Coast GH1, High Street, Southport, Gold Coast, QLD 4215, Australia
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21
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Kishimoto H, Urata Y, Tanaka N, Fujiwara T, Hoffman RM. Selective metastatic tumor labeling with green fluorescent protein and killing by systemic administration of telomerase-dependent adenoviruses. Mol Cancer Ther 2009; 8:3001-8. [PMID: 19887549 DOI: 10.1158/1535-7163.mct-09-0556] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We previously constructed telomerase-dependent, replication-selective adenoviruses OBP-301 (Telomelysin) and OBP-401 [Telomelysin-green fluorescent protein (GFP); TelomeScan], the replication of which is regulated by the human telomerase reverse transcriptase promoter. By intratumoral injection, these viruses could replicate within the primary tumor and subsequent lymph node metastasis. The aim of the present study was to evaluate the possibility of systemic administration of these telomerase-dependent adenoviruses. We assessed the antitumor efficacy of OBP-301 and the ability of OBP-401 to deliver GFP in hepatocellular carcinoma (HCC) and metastatic colon cancer nude mouse models. We showed that i.v. administration of OBP-301 significantly inhibited colon cancer liver metastases and orthotopically implanted HCC. Further, we showed that OBP-401 could visualize liver metastases by tumor-specific expression of the GFP gene after portal venous or i.v. administration. Thus, systemic administration of these adenoviral vectors should have clinical potential to treat and detect liver metastasis and HCC.
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22
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Abstract
The use of replication-competent viruses that can selectively replicate in and destroy neoplastic cells is an attractive strategy for treating cancer. Various oncolytic viruses have been taken to clinical trials since a recombinant virus was first applied to cancer patients a decade ago. The concept of the therapy is simple: infectious virus kills the host cancer cells in the course of viral replication. It is important, however, that the virus does not harm the surrounding normal tissue. Oncolytic viruses can be classified largely into two groups: DNA viruses genetically engineered to achieve cancer specificity (e.g. adenovirus, herpes simplex virus and vaccinia) and RNA viruses of which human is not the natural host (e.g. Newcastle disease virus and reovirus). Prostate cancer has always been one of the major targets of oncolytic virus therapy development. The result of six clinical trials for prostate cancer has been published and several trials are now going on. Forty-eight of 83 (58%) patients evaluated in the phase I studies demonstrated a >25% decrease in serum prostate-specific antigen level without evidence of severe toxicities. The result shows the oncolytic virus therapy is promising toward clinical application. Here, we review the recent advances in the field and summarize the results from clinical trials.
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Affiliation(s)
- Hiroshi Fukuhara
- Department of Urology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
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23
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Zheng FQ, Xu Y, Yang RJ, Wu B, Tan XH, Qin YD, Zhang QW. Combination effect of oncolytic adenovirus therapy and herpes simplex virus thymidine kinase/ganciclovir in hepatic carcinoma animal models. Acta Pharmacol Sin 2009; 30:617-27. [PMID: 19363518 DOI: 10.1038/aps.2009.33] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
AIM Oncolytic adenovirus, also called conditionally replicating adenovirus (CRAD), can selectively propagate in tumor cells and cause cell lysis. The released viral progeny can infect neighboring cancer cells, initiating a cascade that can lead to the ultimate destruction of the tumor. Suicide gene therapy using herpes simplex virus thymidine kinase (HSV-TK) and ganciclovir (GCV) offers a potential treatment strategy for cancer and is undergoing preclinical trials for a variety of tumors. We hypothesized that HSV-TK gene therapy combined with oncolytic adenoviral therapy would have an enhanced effect compared with the individual effects of the therapies and is a potential novel therapeutic strategy to treat liver cancer. METHODS To address our hypothesis, a novel CRAD was created, which consisted of a telomerase-dependent oncolytic adenovirus engineered to express E1A and HSV-TK genes (Ad-ETK). The combined effect of Ad-ETK and GCV was assessed both in vitro and in vivo in nude mice bearing HepG2 cell-derived tumors. Expression of the therapeutic genes by the transduced tumor cells was analyzed by RT-PCR and Western blotting. RESULTS We confirmed that Ad-ETK had antitumorigenic effects on human hepatocellular carcinoma (HCC) both in vitro and in vivo, and the TK/GCV system enhanced oncolytic adenoviral therapy. We confirmed that both E1A and HSV-TK genes were expressed in vivo. CONCLUSION The Ad-ETK construct should provide a relatively safe and selective approach to killing cancer cells and should be investigated as an adjuvant therapy for hepatocellular carcinoma.
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Ji X, Zhang J, Cheng L, Wei F, Li H, Liu X, Chen X, Li C, Wang Y, Huang Q. Oncolytic adenovirus delivering herpes simplex virus thymidine kinase suicide gene reduces the growth of human retinoblastoma in an in vivo mouse model. Exp Eye Res 2009; 89:193-9. [PMID: 19328781 DOI: 10.1016/j.exer.2009.03.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2008] [Revised: 03/17/2009] [Accepted: 03/17/2009] [Indexed: 01/25/2023]
Abstract
Oncolytic conditionally replicating adenoviruses (CRAd) can exclusively replicate in and lyse tumor cells and are therefore promising tools in cancer therapy. In this study, we combined the oncolytic potential of a CRAd with its ability to deliver a suicide gene (herpes simplex virus thymidine kinase suicide gene, HSVtk) in order to further enhance tumor cell killing in a human retinoblastoma (RB) mouse model. We could demonstrate that CRAd driven by the human telomerase reverse transcriptase (hTERT) promoter and armed with the HSV thymidine kinase suicide gene/ganciclovir (HSVtk/GCV) could very effectively reduce growth of human RB in an orthotopic nude mouse model. These findings suggest that hTERT promoter-driven CRAd in combination with HSVtk/GCV gene therapy could be a promising new approach for the treatment of RB. In addition, we found that hTERT promoter-driven CRAd replication occurred exclusively in human RB cells but not in primary human retinal pigment epithelial cells (hRPE), indicating that application of hTERT promoter-driven CRAd for the treatment of RB would be safe.
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Affiliation(s)
- Xunda Ji
- Experimental Center, The First People's Hospital, Shanghai Jiaotong University, Shanghai 200080, China
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Nakajima O, Matsunaga A, Ichimaru D, Urata Y, Fujiwara T, Kawakami K. Telomerase-specific virotherapy in an animal model of human head and neck cancer. Mol Cancer Ther 2009; 8:171-7. [PMID: 19139126 DOI: 10.1158/1535-7163.mct-08-0620] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Telomerase-specific replication-competent adenovirus, Telomelysin (OBP-301), has a human telomerase reverse transcriptase promoter that regulates viral replication and efficiently kills human cancer cells. The objectives of this study are to examine the effects of OBP-301 in squamous cell carcinoma of the head and neck cells in vitro and in xenografted animals in vivo. OBP-301 was found to be cytotoxic to the YCUT892, KCCT873, KCCT891, KCCL871, YCUM862, HN12, and KCCOR891 cell lines in vitro. However, the level of cytotoxicity is not correlated with the expression levels of adenoviral receptors, which may be required for adenoviral infection in squamous cell carcinoma of the head and neck cells. OBP-301 shows remarkable antitumor activity against established s.c. KCCT873 tumors in immunodeficient animals in a dose-dependent manner. In addition, no significant toxicity was observed in animals receiving treatment. These results suggest that OBP-301 is a novel therapeutic agent with promise for the treatment of human head and neck cancers.
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Affiliation(s)
- Oumi Nakajima
- Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health, Kyoto University, Yoshida Konoecho, Sakyo-ku, Kyoto 606-8501, Japan
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