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Gujar S, Pol JG, Kumar V, Lizarralde-Guerrero M, Konda P, Kroemer G, Bell JC. Tutorial: design, production and testing of oncolytic viruses for cancer immunotherapy. Nat Protoc 2024; 19:2540-2570. [PMID: 38769145 DOI: 10.1038/s41596-024-00985-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 02/12/2024] [Indexed: 05/22/2024]
Abstract
Oncolytic viruses (OVs) represent a novel class of cancer immunotherapy agents that preferentially infect and kill cancer cells and promote protective antitumor immunity. Furthermore, OVs can be used in combination with established or upcoming immunotherapeutic agents, especially immune checkpoint inhibitors, to efficiently target a wide range of malignancies. The development of OV-based therapy involves three major steps before clinical evaluation: design, production and preclinical testing. OVs can be designed as natural or engineered strains and subsequently selected for their ability to kill a broad spectrum of cancer cells rather than normal, healthy cells. OV selection is further influenced by multiple factors, such as the availability of a specific viral platform, cancer cell permissivity, the need for genetic engineering to render the virus non-pathogenic and/or more effective and logistical considerations around the use of OVs within the laboratory or clinical setting. Selected OVs are then produced and tested for their anticancer potential by using syngeneic, xenograft or humanized preclinical models wherein immunocompromised and immunocompetent setups are used to elucidate their direct oncolytic ability as well as indirect immunotherapeutic potential in vivo. Finally, OVs demonstrating the desired anticancer potential progress toward translation in patients with cancer. This tutorial provides guidelines for the design, production and preclinical testing of OVs, emphasizing considerations specific to OV technology that determine their clinical utility as cancer immunotherapy agents.
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Affiliation(s)
- Shashi Gujar
- Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada
- Beatrice Hunter Cancer Research Institute, Halifax, Nova Scotia, Canada
| | - Jonathan G Pol
- INSERM, U1138, Paris, France
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France
- Université Paris Cité, Paris, France
- Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, UMS AMICCa, Gustave Roussy, Villejuif, France
| | - Vishnupriyan Kumar
- Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada
- Beatrice Hunter Cancer Research Institute, Halifax, Nova Scotia, Canada
| | - Manuela Lizarralde-Guerrero
- INSERM, U1138, Paris, France
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France
- Université Paris Cité, Paris, France
- Sorbonne Université, Paris, France
- Metabolomics and Cell Biology Platforms, UMS AMICCa, Gustave Roussy, Villejuif, France
- Ecole Normale Supérieure de Lyon, Lyon, France
| | - Prathyusha Konda
- Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Harvard Medical School, Harvard University, Boston, MA, USA
| | - Guido Kroemer
- INSERM, U1138, Paris, France.
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France.
- Université Paris Cité, Paris, France.
- Sorbonne Université, Paris, France.
- Metabolomics and Cell Biology Platforms, UMS AMICCa, Gustave Roussy, Villejuif, France.
- Institut Universitaire de France, Paris, France.
- Institut du Cancer Paris CARPEM, Hôpital Européen Georges Pompidou, AP-HP, Paris, France.
| | - John C Bell
- Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
- Department of Biochemistry, Microbiology & Immunology, University of Ottawa, Ottawa, Ontario, Canada.
- Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
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Chen C, Park AK, Monroy I, Ren Y, Kim SI, Chaurasiya S, Priceman SJ, Fong Y. Using Oncolytic Virus to Retask CD19-Chimeric Antigen Receptor T Cells for Treatment of Pancreatic Cancer: Toward a Universal Chimeric Antigen Receptor T-Cell Strategy for Solid Tumor. J Am Coll Surg 2024; 238:436-447. [PMID: 38214445 DOI: 10.1097/xcs.0000000000000964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
BACKGROUND Chimeric antigen receptor (CAR) T cells targeting the B-cell antigen CD19 are standard therapy for relapsed or refractory B-cell lymphoma and leukemia. CAR T cell therapy in solid tumors is limited due to an immunosuppressive tumor microenvironment and a lack of tumor-restricted antigens. We recently engineered an oncolytic virus (CF33) with high solid tumor affinity and specificity to deliver a nonsignaling truncated CD19 antigen (CD19t), allowing targeting by CD19-CAR T cells. Here, we tested this combination against pancreatic cancer. STUDY DESIGN We engineered CF33 to express a CD19t (CF33-CD19t) target. Flow cytometry and ELISA were performed to quantify CD19t expression, immune activation, and killing by virus and CD19-CAR T cells against various pancreatic tumor cells. Subcutaneous pancreatic human xenograft tumor models were treated with virus, CAR T cells, or virus+CAR T cells. RESULTS In vitro, CF33-CD19t infection of tumor cells resulted in >90% CD19t cell-surface expression. Coculturing CD19-CAR T cells with infected cells resulted in interleukin-2 and interferon gamma secretion, upregulation of T-cell activation markers, and synergistic cell killing. Combination therapy of virus+CAR T cells caused significant tumor regression (day 13): control (n = 16, 485 ± 20 mm 3 ), virus alone (n = 20, 254 ± 23 mm 3 , p = 0.0001), CAR T cells alone (n = 18, 466 ± 25 mm 3 , p = NS), and virus+CAR T cells (n = 16, 128 ± 14 mm 3 , p < 0.0001 vs control; p = 0.0003 vs virus). CONCLUSIONS Engineered CF33-CD19t effectively infects and expresses CD19t in pancreatic tumors, triggering cell killing and increased immunogenic response by CD19-CAR T cells. Notably, CF33-CD19t can turn cold immunologic tumors hot, enabling solid tumors to be targetable by agents designed against liquid tumor antigens.
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Affiliation(s)
- Courtney Chen
- From the Departments of Surgery (Chen, Kim, Chaurasiya, Fong)
| | - Anthony K Park
- Hematology and Hematopoietic Cell Transplantation (Park, Monroy, Ren, Priceman)
- Irell and Manella Graduate School of Biological Sciences (Park), City of Hope, Duarte, CA
| | - Isabel Monroy
- Hematology and Hematopoietic Cell Transplantation (Park, Monroy, Ren, Priceman)
| | - Yuwei Ren
- Hematology and Hematopoietic Cell Transplantation (Park, Monroy, Ren, Priceman)
| | - Sang-In Kim
- From the Departments of Surgery (Chen, Kim, Chaurasiya, Fong)
| | | | - Saul J Priceman
- Hematology and Hematopoietic Cell Transplantation (Park, Monroy, Ren, Priceman)
- Immuno-Oncology, Beckman Research Institute (Priceman)
| | - Yuman Fong
- From the Departments of Surgery (Chen, Kim, Chaurasiya, Fong)
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Iyer M, Ravichandran N, Karuppusamy PA, Gnanarajan R, Yadav MK, Narayanasamy A, Vellingiri B. Molecular insights and promise of oncolytic virus based immunotherapy. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2024; 140:419-492. [PMID: 38762277 DOI: 10.1016/bs.apcsb.2023.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2024]
Abstract
Discovering a therapeutic that can counteract the aggressiveness of this disease's mechanism is crucial for improving survival rates for cancer patients and for better understanding the most different types of cancer. In recent years, using these viruses as an anticancer therapy has been thought to be successful. They mostly work by directly destroying cancer cells, activating the immune system to fight cancer, and expressing exogenous effector genes. For the treatment of tumors, oncolytic viruses (OVs), which can be modified to reproduce only in tumor tissues and lyse them while preserving the healthy non-neoplastic host cells and reinstating antitumor immunity which present a novel immunotherapeutic strategy. OVs can exist naturally or be created in a lab by altering existing viruses. These changes heralded the beginning of a new era of less harmful virus-based cancer therapy. We discuss three different types of oncolytic viruses that have already received regulatory approval to treat cancer as well as clinical research using oncolytic adenoviruses. The primary therapeutic applications, mechanism of action of oncolytic virus updates, future views of this therapy will be covered in this chapter.
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Affiliation(s)
- Mahalaxmi Iyer
- Department of Microbiology, Central University of Punjab, Bathinda, India
| | - Nandita Ravichandran
- Disease Proteomics Laboratory, Department of Zoology, Bharathiar University, Coimbatore, Tamil Nadu, India
| | | | - Roselin Gnanarajan
- Disease Proteomics Laboratory, Department of Zoology, Bharathiar University, Coimbatore, Tamil Nadu, India
| | - Mukesh Kumar Yadav
- Department of Microbiology, Central University of Punjab, Bathinda, India
| | - Arul Narayanasamy
- Disease Proteomics Laboratory, Department of Zoology, Bharathiar University, Coimbatore, Tamil Nadu, India.
| | - Balachandar Vellingiri
- Human Cytogenetics and Stem Cell Laboratory, Department of Zoology, School of Basic Sciences, Central University of Punjab, Bathinda, Punjab, India.
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Mirbahari SN, Da Silva M, Zúñiga AIM, Kooshki Zamani N, St-Laurent G, Totonchi M, Azad T. Recent progress in combination therapy of oncolytic vaccinia virus. Front Immunol 2024; 15:1272351. [PMID: 38558795 PMCID: PMC10979700 DOI: 10.3389/fimmu.2024.1272351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 02/29/2024] [Indexed: 04/04/2024] Open
Abstract
In recent years, oncolytic viruses have emerged as promising agents for treating various cancers. An oncolytic virus is a non-pathogenic virus that, due to genetic manipulation, tends to replicate in and cause lysis of cancerous cells while leaving healthy cells unaffected. Among these viruses, vaccinia virus is an attractive platform for use as an oncolytic platform due to its 190 Kb genome with a high capacity for encoding therapeutic payloads. Combining oncolytic VV therapy with other conventional cancer treatments has been shown to be synergistic and more effective than monotherapies. Additionally, OVV can be used as a vector to deliver therapeutic payloads, alone or in combination with other treatments, to increase overall efficacy. Here, we present a comprehensive analysis of preclinical and clinical studies that have evaluated the efficacy of oncolytic vaccinia viruses in cancer immunotherapy. We discuss the outcomes of these studies, including tumor regression rates, overall survival benefits, and long-term responses. Moreover, we provide insights into the challenges and limitations associated with oncolytic vaccinia virus- based therapies, including immune evasion mechanisms, potential toxicities, and the development of resistance.
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Affiliation(s)
- Seyedeh Nasim Mirbahari
- Faculty of Sciences and Advanced Technologies in Biology, University of Science and Culture, Academic Center for Education, Culture and Research (ACECR), Tehran, Iran
- Department of Genetics, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, Academic Center for Education, Culture and Research (ACECR), Tehran, Iran
| | - Miles Da Silva
- Department of Microbiology and Immunology, University of British Colombia, Vancouver, BC, Canada
- Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, ON, Canada
| | - Abril Ixchel Muñoz Zúñiga
- Department of Microbiology and Infectious Diseases, Université de Sherbrooke, Sherbrooke, QC, Canada
- Centre de Recherche du CHUS, Sherbrooke, QC, Canada
| | - Nika Kooshki Zamani
- Department of Microbiology and Infectious Diseases, Université de Sherbrooke, Sherbrooke, QC, Canada
- Centre de Recherche du CHUS, Sherbrooke, QC, Canada
| | - Gabriel St-Laurent
- Department of Microbiology and Infectious Diseases, Université de Sherbrooke, Sherbrooke, QC, Canada
- Centre de Recherche du CHUS, Sherbrooke, QC, Canada
| | - Mehdi Totonchi
- Department of Genetics, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, Academic Center for Education, Culture and Research (ACECR), Tehran, Iran
| | - Taha Azad
- Department of Microbiology and Infectious Diseases, Université de Sherbrooke, Sherbrooke, QC, Canada
- Centre de Recherche du CHUS, Sherbrooke, QC, Canada
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Yang A, Zhang Z, Chaurasiya S, Park AK, Lu J, Kim SI, Valencia H, Fong Y, Woo Y. Peritoneal-directed chimeric oncolytic virus CF17 prevents malignant ascites and improves survival in gastric cancer peritoneal metastases. Mol Ther Oncolytics 2023; 31:100734. [PMID: 37915757 PMCID: PMC10616379 DOI: 10.1016/j.omto.2023.100734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/04/2023] [Indexed: 11/03/2023] Open
Abstract
Gastric cancer (GC) peritoneal metastasis (PM) is fatal without effective therapy. We investigated CF17, a new replication-competent chimeric poxvirus, against GC cell lines in vitro and PM in an aggressive GCPM mouse model. We performed viral proliferation and cytotoxicity assays on intestinal-type and diffuse-type human GC cell lines following CF17 treatment. At lower MOIs of 0.01, 0.1, there was >80% killing in most cell lines, while in the more aggressive cell lines, killing was seen at higher MOIs of 1.0 and 10.0. We observed reduced peritoneal tumor burden and prolonged survival with intraperitoneal (i.p.) CF17 treatment in nude mice implanted with the resistant GC cell line. At day 91 after treatment, seven of eight mice were alive in the CF17-treated group vs. one of eight mice in the control group. CF17 treatment inhibited ascites formation (0% vs. 62.5% with PBS). Thus, CF17 efficiently infected, replicated in, and killed GC cells in a dose- and time-dependent manner in vitro. In vivo, i.p. CF17 treatment exhibited robust antitumor activity against an aggressive GCPM model to decrease tumor burden, improve survival, and prevent ascites formation. These preclinical results inform the design of future clinical trials of CF17 for peritoneal-directed therapy in GCPM patients.
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Affiliation(s)
- Annie Yang
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Zhifang Zhang
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Shyambabu Chaurasiya
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Anthony K. Park
- Cancer Immunotherapeutics Program, Beckman Research Institute, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Jianming Lu
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Sang-In Kim
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Hannah Valencia
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Yuman Fong
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
| | - Yanghee Woo
- Division of Surgical Oncology, Department of Surgery, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
- Cancer Immunotherapeutics Program, Beckman Research Institute, City of Hope National Medical Center, 1500 E Duarte Road, Duarte, CA, USA
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Enow JA, Sheikh HI, Rahman MM. Tumor Tropism of DNA Viruses for Oncolytic Virotherapy. Viruses 2023; 15:2262. [PMID: 38005938 PMCID: PMC10675630 DOI: 10.3390/v15112262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/08/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
Oncolytic viruses (OVs) have emerged as one of the most promising cancer immunotherapy agents that selectively target and kill cancer cells while sparing normal cells. OVs are from diverse families of viruses and can possess either a DNA or an RNA genome. These viruses also have either a natural or engineered tropism for cancer cells. Oncolytic DNA viruses have the additional advantage of a stable genome and multiple-transgene insertion capability without compromising infection or replication. Herpes simplex virus 1 (HSV-1), a member of the oncolytic DNA viruses, has been approved for the treatment of cancers. This success with HSV-1 was achievable by introducing multiple genetic modifications within the virus to enhance cancer selectivity and reduce the toxicity to healthy cells. Here, we review the natural characteristics of and genetically engineered changes in selected DNA viruses that enhance the tumor tropism of these oncolytic viruses.
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Affiliation(s)
- Junior A. Enow
- Biodesign Center for Personalized Diagnostics, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Hummad I. Sheikh
- Biodesign Center for Personalized Diagnostics, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Masmudur M. Rahman
- Biodesign Center for Personalized Diagnostics, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA
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7
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Kaur SD, Singh AD, Kapoor DN. Current perspectives on Vaxinia virus: an immuno-oncolytic vector in cancer therapy. Med Oncol 2023; 40:205. [PMID: 37318642 DOI: 10.1007/s12032-023-02068-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 05/14/2023] [Indexed: 06/16/2023]
Abstract
Viruses are being researched as cutting-edge therapeutic agents in cancer due to their selective oncolytic action against malignancies. Immuno-oncolytic viruses are a potential category of anticancer treatments because they have natural features that allow viruses to efficiently infect, replicate, and destroy cancer cells. Oncolytic viruses may be genetically modified; engineers can use them as a platform to develop additional therapy modalities that overcome the limitations of current treatment approaches. In recent years, researchers have made great strides in the understanding relationship between cancer and the immune system. An increasing corpus of research is functioning on the immunomodulatory functions of oncolytic virus (OVs). Several clinical studies are currently underway to determine the efficacy of these immuno-oncolytic viruses. These studies are exploring the design of these platforms to elicit the desired immune response and to supplement the available immunotherapeutic modalities to render immune-resistant malignancies amenable to treatment. This review will discuss current research and clinical developments on Vaxinia immuno-oncolytic virus.
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Affiliation(s)
- Simran Deep Kaur
- School of Pharmaceutical Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, Himachal Pradesh, 173229, India
| | - Aman Deep Singh
- Department of Pharmaceutics, ISF College of Pharmacy, Moga, Punjab, 142048, India
| | - Deepak N Kapoor
- School of Pharmaceutical Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, Himachal Pradesh, 173229, India.
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Chaurasiya S, Valencia H, Zhang Z, Kim SI, Yang A, Lu J, Woo Y, Warner SG, Ede NJ, Fong Y. An oncolytic poxvirus encoding hNIS, shows anti-tumor efficacy and allows tumor imaging in a liver cancer model. Mol Cancer Ther 2023; 22:MCT-22-0635. [PMID: 37196156 PMCID: PMC10320468 DOI: 10.1158/1535-7163.mct-22-0635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/25/2023] [Accepted: 05/15/2023] [Indexed: 05/19/2023]
Abstract
Oncolytic viruses (OVs) are live viruses that can selectively replicate in cancer cells. We have engineered an OV (CF33) to make it cancer-selective through the deletion of its J2R (thymidine kinase) gene. Additionally, this virus has been armed with a reporter gene, human sodium iodide symporter (hNIS), to facilitate non-invasive imaging of tumors using positron emission tomography (PET). In this study we evaluated the oncolytic properties of the virus (CF33-hNIS) in liver cancer model, and its usefulness in tumor imaging. The virus was found to efficiently kill liver cancer cells and the virus-mediated cell death exhibited characteristics of immunogenic death based on the analysis of 3 damage associate molecular patterns (DAMPs): calreticulin, ATP and HMGB1. Furthermore, local or systemic administration of a single dose of the virus showed anti-tumor efficacy against a liver cancer xenograft model in mice and significantly increased survival of treated mice. Lastly, PET scanning was performed following injection of the radioisotope I-124, for imaging of tumors, and a single dose of virus as low as 1E03 pfu, administered intratumorally (I.T.) or intravenously (I.V.), allowed for PET imaging of tumors. In conclusion, CF33-hNIS is safe and effective in controlling human tumor xenografts in nude mice, and it also facilitates non-invasive imaging of tumors.
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Affiliation(s)
| | - Hannah Valencia
- Department of Surgery, City of Hope National Medical Center, Duarte, California
| | - Zhifang Zhang
- Department of Surgery, City of Hope National Medical Center, Duarte, California
| | - Sang-In Kim
- Department of Surgery, City of Hope National Medical Center, Duarte, California
| | - Annie Yang
- Department of Surgery, City of Hope National Medical Center, Duarte, California
| | - Jianming Lu
- Department of Surgery, City of Hope National Medical Center, Duarte, California
| | - Yanghee Woo
- Department of Surgery, City of Hope National Medical Center, Duarte, California
| | | | | | - Yuman Fong
- Department of Surgery, City of Hope National Medical Center, Duarte, California
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Yang A, Zhang Z, Chaurasiya S, Park AK, Jung A, Lu J, Kim SI, Priceman S, Fong Y, Woo Y. Development of the oncolytic virus, CF33, and its derivatives for peritoneal-directed treatment of gastric cancer peritoneal metastases. J Immunother Cancer 2023; 11:e006280. [PMID: 37019471 PMCID: PMC10083877 DOI: 10.1136/jitc-2022-006280] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2023] [Indexed: 04/07/2023] Open
Abstract
BACKGROUND Gastric cancer (GC) that metastasizes to the peritoneum is fatal. CF33 and its genetically modified derivatives show cancer selectivity and oncolytic potency against various solid tumors. CF33-hNIS and CF33-hNIS-antiPDL1 have entered phase I trials for intratumoral and intravenous treatments of unresectable solid tumors (NCT05346484) and triple-negative breast cancer (NCT05081492). Here, we investigated the antitumor activity of CF33-oncolytic viruses (OVs) against GC and CF33-hNIS-antiPDL1 in the intraperitoneal (IP) treatment of GC peritoneal metastases (GCPM). METHODS We infected six human GC cell lines AGS, MKN-45, MKN-74, KATO III, SNU-1, and SNU-16 with CF33, CF33-GFP, or CF33-hNIS-antiPDL1 at various multiplicities of infection (0.01, 0.1, 1.0, and 10.0), and performed viral proliferation and cytotoxicity assays. We used immunofluorescence imaging and flow cytometric analysis to verify virus-encoded gene expression. We evaluated the antitumor activity of CF33-hNIS-antiPDL1 following IP treatment (3×105 pfu × 3 doses) in an SNU-16 human tumor xenograft model using non-invasive bioluminescence imaging. RESULTS CF33-OVs showed dose-dependent infection, replication, and killing of both diffuse and intestinal subtypes of human GC cell lines. Immunofluorescence imaging showed virus-encoded GFP, hNIS, and anti-PD-L1 antibody scFv expression in CF33-OV-infected GC cells. We confirmed GC cell surface PD-L1 blockade by virus-encoded anti-PD-L1 scFv using flow cytometry. In the xenograft model, CF33-hNIS-antiPDL1 (IP; 3×105 pfu × 3 doses) treatment significantly reduced peritoneal tumors (p<0.0001), decreased amount of ascites (62.5% PBS vs 25% CF33-hNIS-antiPDL1) and prolonged animal survival. At day 91, seven out of eight mice were alive in the virus-treated group versus one out of eight in the control group (p<0.01). CONCLUSIONS Our results show that CF33-OVs can deliver functional proteins and demonstrate effective antitumor activity in GCPM models when delivered intraperitoneally. These preclinical results will inform the design of future peritoneal-directed therapy in GCPM patients.
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Affiliation(s)
- Annie Yang
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Zhifang Zhang
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Shyambabu Chaurasiya
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Anthony K Park
- Cancer Immunotherapeutics Program, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, USA
| | - Audrey Jung
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Jianming Lu
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Sang-In Kim
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Saul Priceman
- Cancer Immunotherapeutics Program, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, USA
| | - Yuman Fong
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
| | - Yanghee Woo
- Department of Surgery, City of Hope National Medical Center, Duarte, California, USA
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Eilts F, Lothert K, Orbay S, Pagallies F, Amann R, Wolff MW. A Summary of Practical Considerations for the Application of the Steric Exclusion Chromatography for the Purification of the Orf Viral Vector. MEMBRANES 2022; 12:1070. [PMID: 36363625 PMCID: PMC9696199 DOI: 10.3390/membranes12111070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/18/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Steric exclusion chromatography (SXC) is a promising purification method for biological macromolecules such as the Orf virus (ORFV) vector. The method's principle is closely related to conventional polyethylene glycol (PEG) precipitation, repeatedly implementing membranes as porous chromatographic media. In the past decade, several purification tasks with SXC showed exceptionally high yields and a high impurity removal. However, the effect of varying process parameters, on the precipitation success and its limitations to SXC, is not yet well understood. For this reason, the precipitation behavior and SXC adaptation for ORFV were investigated for the PEG/ORFV contact time, the membranes pore size, and the type and concentration of ions. All three parameters influenced the ORFV recoveries significantly. A small pore size and a long contact time induced filtration effects and inhibited a full virus recovery. The application of salts had complex concentration-dependent effects on precipitation and SXC yields, and ranged from a complete prevention of precipitation in the presence of kosmotropic substances to increased efficiencies with Mg2+ ions. The latter finding might be useful to reduce PEG concentrations while maintaining high yields. With this knowledge, we hope to clarify several limitations of SXC operations and improve the tool-set for a successful process adaptation.
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Affiliation(s)
- Friederike Eilts
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Wiesenstr.14, 35390 Giessen, Germany
| | - Keven Lothert
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Wiesenstr.14, 35390 Giessen, Germany
| | - Sabri Orbay
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Wiesenstr.14, 35390 Giessen, Germany
| | - Felix Pagallies
- Department of Immunology, University of Tuebingen, Auf der Morgenstelle 15, 72076 Tuebingen, Germany
| | - Ralf Amann
- Department of Immunology, University of Tuebingen, Auf der Morgenstelle 15, 72076 Tuebingen, Germany
- PRiME Vector Technologies, Herrenberger Straße 24, 72070 Tuebingen, Germany
| | - Michael W. Wolff
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Wiesenstr.14, 35390 Giessen, Germany
- Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Ohlebergsweg 12, 35392 Giessen, Germany
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11
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Kim SI, Chaurasiya S, Sivanandam V, Kang S, Park AK, Lu J, Yang A, Zhang Z, Bagdasarian IA, Woo Y, Morgan JT, Yin Z, Fong Y, Warner SG. Priming stroma with a vitamin D analog to optimize viroimmunotherapy for pancreatic cancer. Mol Ther Oncolytics 2022; 24:864-872. [PMID: 35317522 PMCID: PMC8914466 DOI: 10.1016/j.omto.2022.02.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 02/19/2022] [Indexed: 12/15/2022] Open
Abstract
Pancreatic cancer resistance to immunotherapies is partly due to deficits in tumor-infiltrating immune cells and stromal density. Combination therapies that modify stroma and recruit immune cells are needed. Vitamin D analogs such as calcipotriol (Cal) decrease fibrosis in pancreas stroma, thus allowing increased chemotherapy delivery. OVs infect, replicate in, and kill cancer cells and recruit immune cells to immunodeficient microenvironments. We investigated whether stromal modification with Cal would enhance oncolytic viroimmunotherapy using recombinant orthopoxvirus, CF33. We assessed effect of Cal on CF33 replication using pancreas ductal adenocarcinoma (PDAC) cell lines and in vivo flank orthotopic models. Proliferation assays showed that Cal did not alter viral replication. Less replication was seen in cell lines whose division was slowed by Cal, but this appeared proportional to cell proliferation. Three-dimensional in vitro models demonstrated decreased myofibroblast integrity after Cal treatment. Cal increased vascular lumen size and immune cell infiltration in subcutaneous models of PDAC and increased viral delivery and replication. Cal plus serial OV dosing in the syngeneic Pan02 model caused more significant tumor abrogation than other treatments. Cal-treated tumors had less dense fibrosis, enhanced immune cell infiltration, and decreased T cell exhaustion. Calcipotriol is a possible adjunct for CF33-based oncolytic viroimmunotherapy against PDAC.
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Affiliation(s)
- Sang-In Kim
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Shyambabu Chaurasiya
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Venkatesh Sivanandam
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Seonah Kang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Anthony K Park
- Department of Hematologic Malignancies Translational Science, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Annie Yang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Zhifang Zhang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Isabella A Bagdasarian
- Department of Bioengineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Yanghee Woo
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA.,Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Joshua T Morgan
- Department of Bioengineering, University of California, Riverside, Riverside, CA 92521, USA
| | - Zhirong Yin
- Pathology Core, Department of Pathology, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Yuman Fong
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA.,Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Susanne G Warner
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA.,Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 E. Duarte Road, Duarte, CA 91010, USA
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12
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Chaurasiya S, Yang A, Zhang Z, Lu J, Valencia H, Kim SI, Woo Y, Warner SG, Olafsen T, Zhao Y, Wu X, Fein S, Cheng L, Cheng M, Ede N, Fong Y. A comprehensive preclinical study supporting clinical trial of oncolytic chimeric poxvirus CF33-hNIS-anti-PD-L1 to treat breast cancer. Mol Ther Methods Clin Dev 2022; 24:102-116. [PMID: 35024377 PMCID: PMC8718831 DOI: 10.1016/j.omtm.2021.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 12/04/2021] [Indexed: 01/12/2023]
Abstract
CF33-hNIS-anti-PD-L1 is an oncolytic chimeric poxvirus encoding two transgenes: human sodium iodide symporter and a single-chain variable fragment against PD-L1. Comprehensive preclinical pharmacology studies encompassing primary and secondary pharmacodynamics and biodistribution and safety studies were performed to support the clinical development of CF33-hNIS-anti-PD-L1. Most of the studies were performed in triple-negative breast cancer (TNBC) models, as the phase I trial is planned for patients with TNBC. Biological functions of virus-encoded transgenes were confirmed, and the virus demonstrated anti-tumor efficacy against TNBC models in mice. In a good laboratory practice (GLP) toxicology study, the virus did not produce any observable adverse effects in mice, suggesting that the doses proposed for the clinical trial should be well tolerated in patients. Furthermore, no neurotoxic effects in mice were seen following intracranial injection of the virus. Also, the risk for horizontal transmission of CF33-hNIS-anti-PD-L1 was assessed in mice, and our results suggest that the virus is unlikely to transmit from infected patients to healthy individuals. Finally, the in-use stability and compatibility of CF33-hNIS-anti-PD-L1 tested under different conditions mimicking the clinical scenarios confirmed the suitability of the virus in clinical settings. The results of these preclinical studies support the use of CF33-hNIS-anti-PD-L1 in a first-in-human trial in patients with TNBC.
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Affiliation(s)
- Shyambabu Chaurasiya
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Annie Yang
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Zhifang Zhang
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Hannah Valencia
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Sang-In Kim
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Yanghee Woo
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
| | - Suanne G Warner
- Department of Surgery, Mayo Clinic, Rochester, MN 55902, USA
| | - Tove Olafsen
- Small Animal Imaging Core, Shared Resources, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Yuqi Zhao
- Integrative Genomics Core, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Xiwei Wu
- Integrative Genomics Core, City of Hope National Medical Center, Duarte, CA 91010, USA
| | | | | | | | | | - Yuman Fong
- Department of Surgery, City of Hope National Medical Center, Familian Science building, Room#1100 1500 E Duarte Road, Duarte, CA 91010, USA
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13
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Zhang Z, Yang A, Chaurasiya S, Park AK, Kim SI, Lu J, Olafsen T, Warner SG, Fong Y, Woo Y. PET imaging and treatment of pancreatic cancer peritoneal carcinomatosis after subcutaneous intratumoral administration of a novel oncolytic virus, CF33-hNIS-antiPDL1. Mol Ther Oncolytics 2022; 24:331-339. [PMID: 35118191 PMCID: PMC8784298 DOI: 10.1016/j.omto.2021.12.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 12/28/2021] [Indexed: 11/10/2022] Open
Abstract
Peritoneal carcinomatosis of gastrointestinal malignancies remains fatal. CF33-hNIS-antiPDL1, a chimeric orthopoxvirus expressing the human sodium iodide symporter (hNIS) and anti-human programmed death-ligand 1 antibody, has demonstrated robust preclinical activity against pancreatic adenocarcinoma (PDAC). We investigated the ability of CF33-hNIS-antiPDL1 to infect, help detect, and kill peritoneal tumors following intratumoral (i.t.) injection of subcutaneous (s.c.) tumors in vivo. Human PDAC AsPC-1-ffluc cells were inoculated in both the s.c. space and the peritoneal cavity of athymic mice. After successful tumor engraftment, s.c. tumors were injected with CF33-hNIS-antiPDL1 or PBS. We assessed the ability of CF33-hNIS-antiPDL1 to infect, replicate in, and allow the imaging of tumors at both sites (immunohistochemistry [IHC] and 124I-based positron emission tomography/computed tomography [PET/CT] imaging), tumor burden (bioluminescence imaging), and animal survival. IHC staining for hNIS confirmed expression in s.c. and peritoneal tumors following virus treatment. Compared to the controls, CF33-hNIS-antiPDL1-treated mice showed significantly decreased s.c. and peritoneal tumor burden and improved survival (p < 0.05). Notably, 2 of 8 mice showed complete regression of disease. PET/CT avidity for 124I uptake in s.c. and peritoneal tumors was visible starting at day 7 following the first i.t. dose of CF33-hNIS-antiPDL1. We show that CF33-hNIS-antiPDL1 can help detect and kill both s.c. and peritoneal tumors following s.c. i.t. treatment.
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14
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Shao S, Yang X, Zhang YN, Wang XJ, Li K, Zhao YL, Mou XZ, Hu PY. Oncolytic Virotherapy in Peritoneal Metastasis Gastric Cancer: The Challenges and Achievements. Front Mol Biosci 2022; 9:835300. [PMID: 35295845 PMCID: PMC8918680 DOI: 10.3389/fmolb.2022.835300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/04/2022] [Indexed: 11/13/2022] Open
Abstract
Gastric cancer (GC) is the fourth most common cancer and the second leading cause of cancer death globally. Although the mortality rate in some parts of the world, such as East Asia, is still high, new treatments and lifestyle changes have effectively reduced deaths from this type of cancer. One of the main challenges of this type of cancer is its late diagnosis and poor prognosis. GC patients are usually diagnosed in the advanced stages of the disease, which is often associated with peritoneal metastasis (PM) and significantly reduces survival. This type of metastasis in patients with GC poses a serious challenge due to limitations in common therapies such as surgery and tumor resection, as well as failure to respond to systemic chemotherapy. To solve this problem, researchers have used virotherapy such as reovirus-based anticancer therapy in patients with GC along with PM who are resistant to current chemotherapies because this therapeutic approach is able to overcome immune suppression by activating dendritic cells (DCs) and eventually lead to the intrinsic activity of antitumor effector T cells. This review summarizes the immunopathogenesis of peritoneal metastasis of gastric cancer (PMGC) and the details for using virotherapy as an effective anticancer treatment approach, as well as its challenges and opportunities.
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Affiliation(s)
- Su Shao
- Department of General Surgery, Chun’an First People’s Hospital (Zhejiang Provincial People’s Hospital Chun’an Branch), Hangzhou, China
| | - Xue Yang
- General Surgery, Cancer Center, Department of Hepatobiliary and Pancreatic Surgery and Minimally Invasive Surgery, Key Laboratory of Tumor Molecular Diagnosis and Individualized Medicine of Zhejiang Province, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital of Hangzhou Medical College), Hangzhou, China
- Clinical Research Institute, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital of Hangzhou Medical College), Hangzhou, China
| | - You-Ni Zhang
- Department of Traumatology, Tiantai People’s Hospital of Zhejiang Province (Tiantai Branch of Zhejiang People’s Hospital), Taizhou, China
| | - Xue-Jun Wang
- Department of General Surgery, Chun’an First People’s Hospital (Zhejiang Provincial People’s Hospital Chun’an Branch), Hangzhou, China
| | - Ke Li
- Guangdong Techpool Bio-pharma Co., Ltd., Guangzhou, China
| | - Ya-Long Zhao
- Guangdong Techpool Bio-pharma Co., Ltd., Guangzhou, China
| | - Xiao-Zhou Mou
- General Surgery, Cancer Center, Department of Hepatobiliary and Pancreatic Surgery and Minimally Invasive Surgery, Key Laboratory of Tumor Molecular Diagnosis and Individualized Medicine of Zhejiang Province, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital of Hangzhou Medical College), Hangzhou, China
- Clinical Research Institute, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital of Hangzhou Medical College), Hangzhou, China
- *Correspondence: Xiao-Zhou Mou, ; Pei-Yang Hu,
| | - Pei-Yang Hu
- Department of Traumatology, Tiantai People’s Hospital of Zhejiang Province (Tiantai Branch of Zhejiang People’s Hospital), Taizhou, China
- *Correspondence: Xiao-Zhou Mou, ; Pei-Yang Hu,
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15
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Chaurasiya S, Kim SI, O'Leary M, Park AK, Lu J, Kang S, Zhang Z, Yang A, Woo Y, Fong Y, Warner SG. Toward comprehensive imaging of oncolytic viroimmunotherapy. MOLECULAR THERAPY-ONCOLYTICS 2021; 23:303-310. [PMID: 34786474 PMCID: PMC8569424 DOI: 10.1016/j.omto.2021.06.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Oncolytic viruses infect, replicate in, and kill cancer cells, leaving normal cells unharmed; they also recruit and activate immune cells against tumor cells. While clinical indications for viroimmunotherapy are growing, barriers to widespread treatment remain. Ensuring real-time tracking of viral replication and resulting anti-tumor immune responses will overcome some of these barriers and is thus a top priority. Clinically optimizing trackability of viral replication will promote safe dose increases, guide serial dosing, and enhance treatment effects. However, viral delivery is only half the story. Oncolytic viruses are known to upregulate immune checkpoint expression, thereby priming otherwise immunodeficient tumor immune microenvironments for treatment with checkpoint inhibitors. Novel modalities to track virus-induced changes in tumor microenvironments include non-invasive measurements of immune cell populations and responses to viroimmunotherapy such as (1) in situ use of radiotracers to track checkpoint protein expression or immune cell traffic, and (2) ex vivo labeling of immune cells followed by nuclear medicine imaging. Herein, we review clinical progress toward accurate imaging of oncolytic virus replication, and we further review the current status of functional imaging of immune responses to viroimmunotherapy.
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Affiliation(s)
- Shyambabu Chaurasiya
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Sang-In Kim
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Michael O'Leary
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Anthony K Park
- Center for Gene Therapy, Department of Hematologic and Hematopoietic Cell Transplantation, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Seonah Kang
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Zhifang Zhang
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Annie Yang
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Yanghee Woo
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Yuman Fong
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
| | - Susanne G Warner
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Pavilion 2226, Duarte, CA 91010, USA
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16
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Park AK, Fong Y, Kim SI, Yang J, Murad JP, Lu J, Jeang B, Chang WC, Chen NG, Thomas SH, Forman SJ, Priceman SJ. Effective combination immunotherapy using oncolytic viruses to deliver CAR targets to solid tumors. Sci Transl Med 2021; 12:12/559/eaaz1863. [PMID: 32878978 DOI: 10.1126/scitranslmed.aaz1863] [Citation(s) in RCA: 124] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 06/12/2020] [Accepted: 07/29/2020] [Indexed: 12/16/2022]
Abstract
Chimeric antigen receptor (CAR)-engineered T cell therapy for solid tumors is limited by the lack of both tumor-restricted and homogeneously expressed tumor antigens. Therefore, we engineered an oncolytic virus to express a nonsignaling, truncated CD19 (CD19t) protein for tumor-selective delivery, enabling targeting by CD19-CAR T cells. Infecting tumor cells with an oncolytic vaccinia virus coding for CD19t (OV19t) produced de novo CD19 at the cell surface before virus-mediated tumor lysis. Cocultured CD19-CAR T cells secreted cytokines and exhibited potent cytolytic activity against infected tumors. Using several mouse tumor models, delivery of OV19t promoted tumor control after CD19-CAR T cell administration. OV19t induced local immunity characterized by tumor infiltration of endogenous and adoptively transferred T cells. CAR T cell-mediated tumor killing also induced release of virus from dying tumor cells, which propagated tumor expression of CD19t. Our study features a combination immunotherapy approach using oncolytic viruses to promote de novo CAR T cell targeting of solid tumors.
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Affiliation(s)
- Anthony K Park
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA.,Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA.,Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Yuman Fong
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Sang-In Kim
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Jason Yang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
| | - John P Murad
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA.,Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Brook Jeang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
| | - Wen-Chung Chang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
| | - Nanhai G Chen
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Sandra H Thomas
- Department of Clinical and Translational Project Development, City of Hope, Duarte, CA 91010, USA
| | - Stephen J Forman
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA.,Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA 91010, USA
| | - Saul J Priceman
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA. .,Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA 91010, USA
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17
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Oncolytic Virotherapy for Cancer: Clinical Experience. Biomedicines 2021; 9:biomedicines9040419. [PMID: 33924556 PMCID: PMC8069290 DOI: 10.3390/biomedicines9040419] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 12/22/2022] Open
Abstract
Oncolytic viruses are a new class of therapeutics which are largely in the experimental stage, with just one virus approved by the FDA thus far. While the concept of oncolytic virotherapy is not new, advancements in the fields of molecular biology and virology have renewed the interest in using viruses as oncolytic agents. Backed by robust preclinical data, many oncolytic viruses have entered clinical trials. Oncolytic viruses that have completed some levels of clinical trials or are currently undergoing clinical trials are mostly genetically engineered viruses, with the exception of some RNA viruses. Reolysin, an unmodified RNA virus is clinically the most advanced oncolytic RNA virus that has completed different phases of clinical trials. Other oncolytic viruses that have been studied in clinical trials are mostly DNA viruses that belong to one of the three families: herpesviridae, poxviridae or adenoviridae. In this review work we discuss recent clinical studies with oncolytic viruses, especially herpesvirus, poxvirus, adenovirus and reovirus. In summary, the oncolytic viruses tested so far are well tolerated, even in immune-suppressed patients. For most oncolytic viruses, mild and acceptable toxicities are seen at the currently defined highest feasible doses. However, anti-tumor efficacies of oncolytic viruses have been modest, especially when used as monotherapy. Therefore, the potency of oncolytic viruses needs to be enhanced for more oncolytic viruses to hit the clinic. Aiming to achieve higher therapeutic benefits, oncolytic viruses are currently being studied in combination with other therapies. Here we discuss the currently available clinical data on oncolytic viruses, either as monotherapy or in combination with other treatments.
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18
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Holbrook MC, Goad DW, Grdzelishvili VZ. Expanding the Spectrum of Pancreatic Cancers Responsive to Vesicular Stomatitis Virus-Based Oncolytic Virotherapy: Challenges and Solutions. Cancers (Basel) 2021; 13:1171. [PMID: 33803211 PMCID: PMC7963195 DOI: 10.3390/cancers13051171] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/05/2021] [Accepted: 03/05/2021] [Indexed: 02/07/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a devastating malignancy with poor prognosis and a dismal survival rate, expected to become the second leading cause of cancer-related deaths in the United States. Oncolytic virus (OV) is an anticancer approach that utilizes replication-competent viruses to preferentially infect and kill tumor cells. Vesicular stomatitis virus (VSV), one such OV, is already in several phase I clinical trials against different malignancies. VSV-based recombinant viruses are effective OVs against a majority of tested PDAC cell lines. However, some PDAC cell lines are resistant to VSV. Upregulated type I IFN signaling and constitutive expression of a subset of interferon-simulated genes (ISGs) play a major role in such resistance, while other mechanisms, such as inefficient viral attachment and resistance to VSV-mediated apoptosis, also play a role in some PDACs. Several alternative approaches have been shown to break the resistance of PDACs to VSV without compromising VSV oncoselectivity, including (i) combinations of VSV with JAK1/2 inhibitors (such as ruxolitinib); (ii) triple combinations of VSV with ruxolitinib and polycations improving both VSV replication and attachment; (iii) combinations of VSV with chemotherapeutic drugs (such as paclitaxel) arresting cells in the G2/M phase; (iv) arming VSV with p53 transgenes; (v) directed evolution approach producing more effective OVs. The latter study demonstrated impressive long-term genomic stability of complex VSV recombinants encoding large transgenes, supporting further clinical development of VSV as safe therapeutics for PDAC.
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Affiliation(s)
| | | | - Valery Z. Grdzelishvili
- Department of Biological Sciences, University of North Carolina at Charlotte, Charlotte, NC 28223, USA; (M.C.H.); (D.W.G.)
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19
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Béguin J, Gantzer M, Farine I, Foloppe J, Klonjkowski B, Maurey C, Quéméneur É, Erbs P. Safety, biodistribution and viral shedding of oncolytic vaccinia virus TG6002 administered intravenously in healthy beagle dogs. Sci Rep 2021; 11:2209. [PMID: 33500518 PMCID: PMC7838210 DOI: 10.1038/s41598-021-81831-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 01/11/2021] [Indexed: 01/30/2023] Open
Abstract
Oncolytic virotherapy is an emerging strategy that uses replication-competent viruses to kill tumor cells. We have reported the oncolytic effects of TG6002, a recombinant oncolytic vaccinia virus, in preclinical human xenograft models and canine tumor explants. To assess the safety, biodistribution and shedding of TG6002 administered by the intravenous route, we conducted a study in immune-competent healthy dogs. Three dogs each received a single intravenous injection of TG6002 at 105 PFU/kg, 106 PFU/kg or 107 PFU/kg, and one dog received three intravenous injections at 107 PFU/kg. The injections were well tolerated without any clinical, hematological or biochemical adverse events. Viral genomes were only detected in blood at the earliest sampling time point of one-hour post-injection at 107 PFU/kg. Post mortem analyses at day 35 allowed detection of viral DNA in the spleen of the dog which received three injections at 107 PFU/kg. Viral genomes were not detected in the urine, saliva or feces of any dogs. Seven days after the injections, a dose-dependent antibody mediated immune response was identified. In conclusion, intravenous administration of TG6002 shows a good safety profile, supporting the initiation of clinical trials in canine cancer patients as well as further development as a human cancer therapy.
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Affiliation(s)
- Jérémy Béguin
- Transgene, Illkirch-Graffenstaden, France
- UMR Virologie, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
- Department of Internal Medicine, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, Maisons-Alfort, France
| | | | | | | | - Bernard Klonjkowski
- UMR Virologie, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Christelle Maurey
- Department of Internal Medicine, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, Maisons-Alfort, France
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20
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Novel Chimeric Poxvirus CF17 Improves Survival in a Murine Model of Intraperitoneal Ovarian Cancer Metastasis. MOLECULAR THERAPY-ONCOLYTICS 2020; 19:278-282. [PMID: 33251335 PMCID: PMC7672245 DOI: 10.1016/j.omto.2020.10.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 10/06/2020] [Indexed: 11/22/2022]
Abstract
Despite improvements in surgical techniques and chemotherapy, ovarian cancer remains the most lethal gynecologic cancer. Thus, there is an urgent need for more effective therapeutics, particularly for chemo-resistant peritoneal ovarian cancer metastases. Oncolytic virotherapy represents an innovative treatment paradigm; however, for oncolytic viruses tested from the last generation of genetically engineered viruses, the therapeutic benefits have been modest. To overcome these limitations, we generated a chimeric poxvirus, CF17, through the chimerization of nine species of orthopoxviruses. Compared with its parental viruses, CF17 has demonstrated superior oncolytic characteristics. Here, we report the oncolytic potential of CF17 in ovarian cancer. Replication of CF17 and its resulting cytotoxicity were observed at multiplicities of infection (MOIs) as low as 0.001 in human and mouse cancer cell lines in vitro. Furthermore, CF17 exerted potent antitumor effects in a syngeneic mouse model of ovarian cancer at doses as low as 6 × 106 plaque-forming units. Together, these data merit further investigation of the potential use of this novel chimeric poxvirus as an effective treatment for aggressive intraperitoneal ovarian cancer.
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21
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Kim SI, Park AK, Chaurasiya S, Kang S, Lu J, Yang A, Sivanandam V, Zhang Z, Woo Y, Priceman SJ, Fong Y, Warner SG. Recombinant Orthopoxvirus Primes Colon Cancer for Checkpoint Inhibitor and Cross-Primes T Cells for Antitumor and Antiviral Immunity. Mol Cancer Ther 2020; 20:173-182. [PMID: 33262221 DOI: 10.1158/1535-7163.mct-20-0405] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 08/04/2020] [Accepted: 10/08/2020] [Indexed: 11/16/2022]
Abstract
Although it is known that oncolytic viruses can inflame and recruit immune cells to otherwise immunosuppressed tumor microenvironments, the influence of the antiviral immune response on antitumor immunity is less clear across viral platforms and tumor types. CF33 is a recombinant orthopoxvirus backbone effective against colon cancer. We tested derivatives of CF33 with and without immune-checkpoint inhibition (anti-PD-L1) in mouse models of colon cancer. Results showed that the efficacy of CF33 backbone with J2R deletion (single-deleted) against colon cancer is not altered by additional deletion of F14.5L in vitro or in vivo CF33 infection upregulated PD-L1 expression on tumor cells and led to an increased influx of lymphocytes and macrophages in tumors. Also, the levels of active CD8+ (IFNγ+) T cells in the virus-treated tumors were higher than those in control-treated tumors. Furthermore, a combination of CF33 derivatives with anti-PD-L1 resulted in durable tumor regression and long-term survival, resistant to tumor rechallenge. Analysis of immune cells from the treated mice showed that tumor-specific T cell activation occurred more robustly in tumors treated with the virus and that T cells were more strongly activated against the virus than against tumor, in an MHC-I-dependent manner. Our findings warrant further studies on the role of cross-priming of T cells against viral and tumor antigens, in the overall success of viroimmunotherapy.
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Affiliation(s)
- Sang-In Kim
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Anthony K Park
- Department of Hematology and Hematopoietic Cell Transplantation, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Shyambabu Chaurasiya
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Seonah Kang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Jianming Lu
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Annie Yang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Venkatesh Sivanandam
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Zhifang Zhang
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Yanghee Woo
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California.,Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, California
| | - Saul J Priceman
- Department of Hematology and Hematopoietic Cell Transplantation, Beckman Research Institute, City of Hope National Medical Center, Duarte, California
| | - Yuman Fong
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California.,Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, California
| | - Susanne G Warner
- Department of Immuno-Oncology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California. .,Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, California
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22
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Lundstrom K. Application of Viral Vectors for Vaccine Development with a Special Emphasis on COVID-19. Viruses 2020; 12:E1324. [PMID: 33218001 PMCID: PMC7698750 DOI: 10.3390/v12111324] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/16/2020] [Accepted: 11/17/2020] [Indexed: 12/12/2022] Open
Abstract
Viral vectors can generate high levels of recombinant protein expression providing the basis for modern vaccine development. A large number of different viral vector expression systems have been utilized for targeting viral surface proteins and tumor-associated antigens. Immunization studies in preclinical animal models have evaluated the elicited humoral and cellular responses and the possible protection against challenges with lethal doses of infectious pathogens or tumor cells. Several vaccine candidates for both infectious diseases and various cancers have been subjected to a number of clinical trials. Human immunization trials have confirmed safe application of viral vectors, generation of neutralizing antibodies and protection against challenges with lethal doses. A special emphasis is placed on COVID-19 vaccines based on viral vectors. Likewise, the flexibility and advantages of applying viral particles, RNA replicons and DNA replicon vectors of self-replicating RNA viruses for vaccine development are presented.
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23
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Vitamin D as a Primer for Oncolytic Viral Therapy in Colon Cancer Models. Int J Mol Sci 2020; 21:ijms21197326. [PMID: 33023064 PMCID: PMC7582493 DOI: 10.3390/ijms21197326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 09/28/2020] [Accepted: 09/29/2020] [Indexed: 01/05/2023] Open
Abstract
Oncolytic viroimmunotherapy is an exciting modality that can offer lasting anti-tumor immunity for aggressive malignancies like colon cancer. The impact of oncolytic viruses may be extended by combining them with agents to prime a tumor for viral susceptibility. This study investigates vitamin D analogue as an adjunct to oncolytic viral therapy for colon cancer. While vitamin D (VD) has historically been viewed as anti-viral, our in vitro investigations using human colon cancer cell lines showed that VD does not directly inhibit replication of recombinant chimeric poxvirus CF33. VD did restrict growth in HT29 but not HCT116 human colon cancer cells. In vivo investigations using HCT116 and HT29 xenograft models of colon cancer demonstrated that a VD analogue, calcipotriol, was additive with CF33-based viral therapy in VD-responsive HT29 but not in HCT116 tumors. Analyses of RNA-sequencing and gene expression data demonstrated a downregulation in the Jak-STAT signaling pathway with the addition of VD to viral therapy in HT29 models suggesting that the anti-inflammatory properties of VD may enhance the effects of viral therapy in some models. In conclusion, VD may prime oncolytic viral therapy in certain colon cancers.
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24
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Hammad M, Cornejo YR, Batalla-Covello J, Majid AA, Burke C, Liu Z, Yuan YC, Li M, Dellinger TH, Lu J, Chen NG, Fong Y, Aboody KS, Mooney R. Neural Stem Cells Improve the Delivery of Oncolytic Chimeric Orthopoxvirus in a Metastatic Ovarian Cancer Model. Mol Ther Oncolytics 2020; 18:326-334. [PMID: 32775617 PMCID: PMC7394740 DOI: 10.1016/j.omto.2020.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 07/01/2020] [Indexed: 12/22/2022] Open
Abstract
Oncolytic virotherapy represents a promising approach for treating recurrent and/or drug-resistant ovarian cancer. However, its successful application in the clinic has been hampered by rapid immune-mediated clearance, which reduces viral delivery to the tumor. Patient-derived mesenchymal stem cells that home to tumors have been used as viral delivery tools, but variability associated with autologous cell isolations limits the clinical applicability of this approach. We previously developed an allogeneic, clonal neural stem cell (NSC) line (HB1.F3.CD21) that can be used to deliver viral cargo. Here, we demonstrate that this NSC line can improve the delivery of a thymidine kinase gene-deficient conditionally replication-competent orthopoxvirus, CF33, in a preclinical cisplatin-resistant peritoneal ovarian metastases model. Overall, our findings provide the basis for using off-the-shelf allogeneic cell-based delivery platforms for oncolytic viruses, thus providing a more efficient delivery alternative compared with the free virus administration approach.
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Affiliation(s)
- Mohamed Hammad
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
| | - Yvonne R. Cornejo
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
- Irell & Manella Graduate School for Biological Sciences at the Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Jennifer Batalla-Covello
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
- Irell & Manella Graduate School for Biological Sciences at the Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Asma Abdul Majid
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
| | - Connor Burke
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
| | - Zheng Liu
- Translational Bioinformatics Division, Center for Informatics, City of Hope, Duarte, CA 91010, USA
| | - Yate-Ching Yuan
- Translational Bioinformatics Division, Center for Informatics, City of Hope, Duarte, CA 91010, USA
| | - Min Li
- Department of Information Sciences, Division of Biostatistics at the Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Thanh H. Dellinger
- Division of Gynecologic Surgery, Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Nanhai G. Chen
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
- Center for Gene Therapy, City of Hope, Duarte, CA 91010, USA
| | - Yuman Fong
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
- Center for Gene Therapy, City of Hope, Duarte, CA 91010, USA
| | - Karen S. Aboody
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
- Division of Neurosurgery, City of Hope, Duarte, CA 91010, USA
| | - Rachael Mooney
- Department of Developmental and Stem Cell Biology, City of Hope, Duarte, CA 91010, USA
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25
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Park AK, Fong Y, Kim SI, Yang J, Murad JP, Lu J, Jeang B, Chang WC, Chen NG, Thomas SH, Forman SJ, Priceman SJ. Effective combination immunotherapy using oncolytic viruses to deliver CAR targets to solid tumors. Sci Transl Med 2020. [DOI: 10.1126/scitranslmed.aaz1863
http://stm.sciencemag.org] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
An effective combination immunotherapy using oncolytic viruses delivers de novo CD19 to promote CD19-CAR T cell therapy against solid tumors in mice.
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Affiliation(s)
- Anthony K. Park
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
- Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Yuman Fong
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Sang-In Kim
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Jason Yang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
| | - John P. Murad
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
- Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Brook Jeang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
| | - Wen-Chung Chang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
| | - Nanhai G. Chen
- Department of Surgery, City of Hope, Duarte, CA 91010, USA
| | - Sandra H. Thomas
- Department of Clinical and Translational Project Development, City of Hope, Duarte, CA 91010, USA
| | - Stephen J. Forman
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
- Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA 91010, USA
| | - Saul J. Priceman
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA 91010, USA
- Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA 91010, USA
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26
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Lothert K, Pagallies F, Eilts F, Sivanesapillai A, Hardt M, Moebus A, Feger T, Amann R, Wolff MW. A scalable downstream process for the purification of the cell culture-derived Orf virus for human or veterinary applications. J Biotechnol 2020; 323:221-230. [PMID: 32860824 DOI: 10.1016/j.jbiotec.2020.08.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/06/2020] [Accepted: 08/23/2020] [Indexed: 12/11/2022]
Abstract
The large demand for safe and efficient viral vector-based vaccines and gene therapies against both inherited and acquired diseases accelerates the development of viral vectors. One outstanding example, the Orf virus, has a wide range of applications, a superior efficacy and an excellent safety profile combined with a reduced pathogenicity compared to other viral vectors. However, besides these favorable attributes, an efficient and scalable downstream process still needs to be developed. Recently, we screened potential chromatographic stationary phases for Orf virus purification. Based on these previous accomplishments, we developed a complete downstream process for the cell culture-derived Orf virus. The described process comprises a membrane-based clarification step, a nuclease treatment, steric exclusion chromatography, and a secondary chromatographic purification step using Capto® Core 700 resin. The applicability of this process to a variety of diverse Orf virus vectors was shown, testing two different genotypes. These studies render the possibility to apply the developed downstream scheme for both genotypes, and lead to overall virus yields of about 64 %, with step recoveries of >70 % for the clarification, and >90 % for the chromatography train. Protein concentrations of the final product are below the detection limits, and the final DNA concentration of about 1 ng per 1E + 06 infective virus units resembles a total DNA depletion of 96-98 %.
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Affiliation(s)
- Keven Lothert
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Giessen, Germany
| | - Felix Pagallies
- Department of Immunology, University of Tuebingen, Tuebingen, Germany
| | - Friederike Eilts
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Giessen, Germany
| | - Arabi Sivanesapillai
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Giessen, Germany
| | - Martin Hardt
- Imaging Unit, Biomedical Research Centre Seltersberg, Justus Liebig University, Giessen, Germany
| | - Anna Moebus
- Imaging Unit, Biomedical Research Centre Seltersberg, Justus Liebig University, Giessen, Germany
| | - Thomas Feger
- Department of Immunology, University of Tuebingen, Tuebingen, Germany
| | - Ralf Amann
- Department of Immunology, University of Tuebingen, Tuebingen, Germany
| | - Michael W Wolff
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Giessen, Germany; Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Giessen, Germany.
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27
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Lothert K, Pagallies F, Feger T, Amann R, Wolff MW. Selection of chromatographic methods for the purification of cell culture-derived Orf virus for its application as a vaccine or viral vector. J Biotechnol 2020; 323:62-72. [PMID: 32763261 PMCID: PMC7403136 DOI: 10.1016/j.jbiotec.2020.07.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/23/2020] [Accepted: 07/31/2020] [Indexed: 12/02/2022]
Abstract
Estimation of the isoelectric point and size of Vero cell-derived Orf virus. Limited dynamic binding capacity of tested Orf virus to sulfated cellulose. Purification of Orf virus by steric exclusion chromatography lead to 84 % recovery. Hydrophobic interaction chromatography suitable for Orf virus purification. Promising unit operations for a scalable DSP to produce Orf virus viral vectors.
In recent years, the Orf virus has become a promising tool for protective recombinant vaccines and oncolytic therapy. However, suitable methods for an Orf virus production, including up- and downstream, are very limited. The presented study focuses on downstream processing, describing the evaluation of different chromatographic unit operations. In this context, ion exchange-, pseudo-affinity- and steric exclusion chromatography were employed for the purification of the cell culture-derived Orf virus, aiming at a maximum in virus recovery and contaminant depletion. The most promising chromatographic methods for capturing the virus particles were the steric exclusion- or salt-tolerant anion exchange membrane chromatography, recovering 84 % and 86 % of the infectious virus. Combining the steric exclusion chromatography with a subsequent Capto™ Core 700 resin or hydrophobic interaction membrane chromatography as a secondary chromatographic step, overall virus recoveries of up to 76 % were achieved. Furthermore, a complete cellular protein removal and a host cell DNA depletion of up to 82 % was possible for the steric exclusion membranes and the Capto™ Core 700 combination. The study reveals a range of possible unit operations suited for the chromatographic purification of the cell culture-derived Orf virus, depending on the intended application, i.e. a human or veterinary use, and the required purity.
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Affiliation(s)
- Keven Lothert
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Giessen, Germany
| | - Felix Pagallies
- Department of Immunology, University of Tuebingen, Tuebingen, Germany
| | - Thomas Feger
- Department of Immunology, University of Tuebingen, Tuebingen, Germany
| | - Ralf Amann
- Department of Immunology, University of Tuebingen, Tuebingen, Germany
| | - Michael W Wolff
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen (THM), Giessen, Germany; Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Giessen, Germany.
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28
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Li L, Liu S, Han D, Tang B, Ma J. Delivery and Biosafety of Oncolytic Virotherapy. Front Oncol 2020; 10:475. [PMID: 32373515 PMCID: PMC7176816 DOI: 10.3389/fonc.2020.00475] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 03/16/2020] [Indexed: 12/19/2022] Open
Abstract
In recent years, oncolytic virotherapy has emerged as a promising anticancer therapy. Oncolytic viruses destroy cancer cells, without damaging normal tissues, through virus self-replication and antitumor immunity responses, showing great potential for cancer treatment. However, the clinical guidelines for administering oncolytic virotherapy remain unclear. Delivery routes for oncolytic virotherapy to patients vary in existing studies, depending on the tumor sites and the objective of studies. Moreover, the biosafety of oncolytic virotherapy, including mainly uncontrolled adverse events and long-term complications, remains a serious concern that needs to be accurately measured. This review provides a comprehensive and detailed overview of the delivery and biosafety of oncolytic virotherapy.
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Affiliation(s)
- Lizhi Li
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China.,Cancer Research Institute, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, China
| | - Shixin Liu
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China.,Cancer Research Institute, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, China
| | - Duoduo Han
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China.,Cancer Research Institute, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, China
| | - Bin Tang
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China.,Cancer Research Institute, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, China
| | - Jian Ma
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China.,Cancer Research Institute, School of Basic Medical Science, Xiangya School of Medicine, Central South University, Changsha, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, National Health Commission Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, China
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29
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Chaurasiya S, Yang A, Kang S, Lu J, Kim SI, Park AK, Sivanandam V, Zhang Z, Woo Y, Warner SG, Fong Y. Oncolytic poxvirus CF33-hNIS-ΔF14.5 favorably modulates tumor immune microenvironment and works synergistically with anti-PD-L1 antibody in a triple-negative breast cancer model. Oncoimmunology 2020; 9:1729300. [PMID: 32158622 PMCID: PMC7051185 DOI: 10.1080/2162402x.2020.1729300] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 12/31/2019] [Accepted: 01/06/2020] [Indexed: 12/28/2022] Open
Abstract
Triple-negative breast cancer is the most aggressive subtype of breast cancer and is difficult to treat. Breast cancer is considered to be poorly immunogenic and hence is less responsive to immunotherapies. We tested whether the oncolytic poxvirus CF33-hNIS-ΔF14.5 could modulate tumor immune microenvironment and make the tumors responsive to the immune checkpoint inhibitor anti-PD-L1. We found that virus infection causes the upregulation of PD-L1 levels on triple-negative breast cancer cells in vitro as well as in vivo in mice. In a mouse model of orthotopic triple-negative breast cancer, the virus was found to increase tumor infiltration by CD8+ T cells. Likewise, in mice treated with CF33-hNIS-ΔF14.5 high levels of proinflammatory cytokines IFNγ and IL-6 were found in the tumors but not in the serum. The levels of immune modulation were even higher in mice that were treated with a combination of the virus and anti-PD-L1 antibody. While CF33-hNIS-ΔF14.5 and anti-PD-L1 antibody failed to exert significant anti-tumor effect as a single agent, a combination of the two agents resulted in significant anti-tumor effect with 50% mice experiencing complete tumor regression when both agents were injected intra-tumorally. Furthermore, the ‘cured’ mice did not develop tumor after re-challenge with the same cancer cells suggesting that they developed immunity against those cancer cells. Taken together, our study shows that CF33-hNIS-ΔF14.5 favorably modulates tumor immune microenvironment in triple-negative breast cancer model making them responsive to the immune checkpoint inhibitor anti-PD-L1, and hence warrants further studies to determine the clinical applicability of this combination therapy.
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Affiliation(s)
| | - Annie Yang
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Seonah Kang
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Jianming Lu
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Sang-In Kim
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Anthony K Park
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | | | - Zhifang Zhang
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Yanghee Woo
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Susanne G Warner
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Yuman Fong
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
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30
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Novel Chimeric Immuno-Oncolytic Virus CF33-hNIS-antiPDL1 for the Treatment of Pancreatic Cancer. J Am Coll Surg 2020; 230:709-717. [PMID: 32032721 DOI: 10.1016/j.jamcollsurg.2019.12.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 12/17/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Peritoneal carcinomatosis (PC) from pancreatic ductal adenocarcinoma (PDAC) is fatal. Our preclinical study presents an effective treatment against PDAC PC using a novel oncolytic viral agent, CF33-hNIS-antiPDL1. STUDY DESIGN CF33-hNIS-antiPDL1 is a genetically engineered chimeric orthopoxvirus, CF33, armed with the human Sodium Iodide Symporter (hNIS) and anti-PD-L1 antibody (anti-PD-L1). The in vitro cytotoxic ability of this virus against 5 PDAC cell lines was tested at various doses (multiplicity of infection [MOI] = 0.01, 0.1, 1, 10). Production and blockade function of virus-encoded anti-PD-L1 antibody were verified using immunoblot, immunoprecipitation, and PD-1/PD-L1 bioassay. In vivo mouse models of PC, with or without subcutaneous (SC) tumors, created by injecting AsPC-1-ffluc cells into nude mice, were treated with PBS or a single dose (1×105 plaque-forming units) of either intraperitoneal (IP) or IV injection of CF33-hNIS-antiPDL1. Mice with PC tumors were treated on days 0, 2, or 14 after tumor implantation. RESULTS CF33-hNIS-antiPDL1 killed PDAC cells in a dose-dependent manner, achieving >90% cell killing by day 8. Cells infected with CF33-hNIS-antiPDL1 produced bioactive anti-PD-L1 antibody, which blocked PD-1/PD-L1 interaction. In vivo, a single dose of virus reduced tumor burden and prolonged survival of treated mice. It was observed that IP administration of CF33-hNIS-antiPDL1 was more effective than IV administration. CONCLUSIONS CF33-hNIS-antiPDL1 virus is effective in infecting and killing human PDACs and producing functional anti-PD-L1 antibody. Intraperitoneal delivery of CF33-hNIS-antiPDL1 effectively reduces peritoneal tumor burden and improves survival after only 1 dose and is superior to IV delivery.
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31
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Chaurasiya S, Chen NG, Lu J, Martin N, Shen Y, Kim SI, Warner SG, Woo Y, Fong Y. A chimeric poxvirus with J2R (thymidine kinase) deletion shows safety and anti-tumor activity in lung cancer models. Cancer Gene Ther 2019; 27:125-135. [PMID: 31209267 PMCID: PMC7170804 DOI: 10.1038/s41417-019-0114-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 06/01/2019] [Indexed: 12/24/2022]
Abstract
Oncolytic viruses have shown excellent safety profiles in preclinical and clinical studies; however, in most cases therapeutic benefits have been modest. We have previously reported the generation of a chimeric poxvirus (CF33), with significantly improved oncolytic characteristics, through chimerization among different poxviruses. Here we report the sequence analysis of CF33 and oncolytic potential of a GFP-encoding CF33 virus (CF33-GFP) with a J2R deletion in lung cancer models. Replication of CF33-GFP and the resulting cytotoxicity were higher in cancer cell lines compared to a normal cell line, in vitro. After infection with virus, cancer cells expressed markers for immunogenic cell death in vitro. Furthermore, CF33-GFP was safe and exerted potent anti-tumor effects at a dose as low as 1000 plaque forming units in both virus-injected and un-injected distant tumors in A549 tumor xenograft model in mice. Likewise, in a syngeneic model of lung cancer in mice, the virus showed significant anti-tumor effect and was found to increase tumor infiltration by CD8+ T cells. Collectively, these data warrant further investigation of this novel chimeric poxvirus for its potential use as a cancer bio-therapeutic.
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Affiliation(s)
| | - Nanhai G Chen
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Jianming Lu
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | | | - Yinan Shen
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA.,Department of Hepatobiliary and Pancreatic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Sang-In Kim
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Susanne G Warner
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Yanghee Woo
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA
| | - Yuman Fong
- Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA.
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Warner SG, Kim SI, Chaurasiya S, O'Leary MP, Lu J, Sivanandam V, Woo Y, Chen NG, Fong Y. A Novel Chimeric Poxvirus Encoding hNIS Is Tumor-Tropic, Imageable, and Synergistic with Radioiodine to Sustain Colon Cancer Regression. MOLECULAR THERAPY-ONCOLYTICS 2019; 13:82-92. [PMID: 31061881 PMCID: PMC6495072 DOI: 10.1016/j.omto.2019.04.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 04/04/2019] [Indexed: 12/11/2022]
Abstract
Colon cancer has a high rate of recurrence even with good response to modern therapies. Novel curative adjuncts are needed. Oncolytic viral therapy has shown preclinical promise against colon cancer but lacks robust efficacy in clinical trials and raises regulatory concerns without real-time tracking of viral replication. Novel potent vectors are needed with adjunctive features to enhance clinical efficacy. We have thus used homologous recombination and high-throughput screening to create a novel chimeric poxvirus encoding a human sodium iodide symporter (hNIS) at a redundant tk locus. The resulting virus (CF33-hNIS) consistently expresses hNIS and demonstrates replication efficiency and immunogenic cell death in colon cancer cells in vitro. Tumor-specific CF33-hNIS efficacy against colon cancer results in tumor regression in vivo in colon cancer xenograft models. Early expression of hNIS by infected cells makes viral replication reliably imageable via positron emission tomography (PET) of I-124 uptake. The intensity of I-124 uptake mirrors viral replication and tumor regression. Finally, systemic delivery of radiotherapeutic I-131 isotope following CF33-hNIS infection of colon cancer xenografts enhances and sustains tumor regression compared with virus treatment alone in HCT116 xenografts, demonstrating synergy of oncolytic viral therapy with radioablation in vivo.
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Affiliation(s)
- Susanne G Warner
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA.,Center for Gene Therapy, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Sang-In Kim
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Shyambabu Chaurasiya
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Michael P O'Leary
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Jianming Lu
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Venkatesh Sivanandam
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Yanghee Woo
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Nanhai G Chen
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA.,Center for Gene Therapy, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Yuman Fong
- Department of Surgery, Division of Surgical Oncology, City of Hope National Medical Center, Duarte, CA 91010, USA.,Center for Gene Therapy, Beckman Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
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33
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Vaccinia Virus Shuffling: deVV5, a Novel Chimeric Poxvirus with Improved Oncolytic Potency. Cancers (Basel) 2018; 10:cancers10070231. [PMID: 29996551 PMCID: PMC6070928 DOI: 10.3390/cancers10070231] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 05/31/2018] [Accepted: 06/01/2018] [Indexed: 01/04/2023] Open
Abstract
Oncolytic virus (OV) therapy has emerged as a promising approach for cancer treatment with the potential to be less toxic and more efficient than classic cancer therapies. Various types of OVs in clinical development, including Vaccinia virus (VACV)-derived OVs, have shown good safety profiles, but limited therapeutic efficacy as monotherapy in some cancer models. Many different methods have been employed to improve the oncolytic potency of OVs. In this study, we used a directed evolution process, pooling different strains of VACV, including Copenhagen, Western Reserve and Wyeth strains and the attenuated modified vaccinia virus Ankara (MVA), to generate a new recombinant poxvirus with increased oncolytic properties. Through selective pressure, a chimeric VACV, deVV5, with increased cancer cell killing capacity and tumor selectivity in vitro was derived. The chimeric viral genome contains sequences of all parental strains. To further improve the tumor selectivity and anti-tumor activity of deVV5, we generated a thymidine kinase (TK)-deleted chimeric virus armed with the suicide gene FCU1. This TK-deleted virus, deVV5-fcu1 replicated efficiently in human tumor cells, and was notably attenuated in normal primary cells. These studies demonstrate the potential of directed evolution as an efficient way to generate recombinant poxviruses with increased oncolytic potency, and with high therapeutic index to improve cancer therapy.
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