1
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Hillebrandt N, Hubbuch J. Size-selective downstream processing of virus particles and non-enveloped virus-like particles. Front Bioeng Biotechnol 2023; 11:1192050. [PMID: 37304136 PMCID: PMC10248422 DOI: 10.3389/fbioe.2023.1192050] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/08/2023] [Indexed: 06/13/2023] Open
Abstract
Non-enveloped virus-like particles (VLPs) are versatile protein nanoparticles with great potential for biopharmaceutical applications. However, conventional protein downstream processing (DSP) and platform processes are often not easily applicable due to the large size of VLPs and virus particles (VPs) in general. The application of size-selective separation techniques offers to exploit the size difference between VPs and common host-cell impurities. Moreover, size-selective separation techniques offer the potential for wide applicability across different VPs. In this work, basic principles and applications of size-selective separation techniques are reviewed to highlight their potential in DSP of VPs. Finally, specific DSP steps for non-enveloped VLPs and their subunits are reviewed as well as the potential applications and benefits of size-selective separation techniques are shown.
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Affiliation(s)
| | - Jürgen Hubbuch
- Institute of Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
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2
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Mekkaoui L, Tejerizo JG, Abreu S, Rubat L, Nikoniuk A, Macmorland W, Horlock C, Matsumoto S, Williams S, Smith K, Price J, Srivastava S, Hussain R, Banani MA, Day W, Stevenson E, Madigan M, Chen J, Khinder R, Miah S, Walker S, Ade-Onojobi M, Domining S, Sillibourne J, Sabatino M, Slepushkin V, Farzaneh F, Pule M. Efficient clinical-grade γ-retroviral vector purification by high-speed centrifugation for CAR T cell manufacturing. Mol Ther Methods Clin Dev 2022; 28:116-128. [PMID: 36620071 PMCID: PMC9808014 DOI: 10.1016/j.omtm.2022.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 12/07/2022] [Indexed: 12/13/2022]
Abstract
γ-Retroviral vectors (γ-RV) are powerful tools for gene therapy applications. Current clinical vectors are produced from stable producer cell lines which require minimal further downstream processing, while purification schemes for γ-RV produced by transient transfection have not been thoroughly investigated. We aimed to develop a method to purify transiently produced γ-RV for early clinical studies. Here, we report a simple one-step purification method by high-speed centrifugation for γ-RV produced by transient transfection for clinical application. High-speed centrifugation enabled the concentration of viral titers in the range of 107-108 TU/mL with >80% overall recovery. Analysis of research-grade concentrated vector revealed sufficient reduction in product- and process-related impurities. Furthermore, product characterization of clinical-grade γ-RV by BioReliance demonstrated two-logs lower impurities per transducing unit compared with regulatory authority-approved stable producer cell line vector for clinical application. In terms of CAR T cell manufacturing, clinical-grade γ-RV produced by transient transfection and purified by high-speed centrifugation was similar to γ-RV produced from a clinical-grade stable producer cell line. This method will be of value for studies using γ-RV to bridge vector supply between early- and late-stage clinical trials.
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Affiliation(s)
- Leila Mekkaoui
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Jose G. Tejerizo
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Sara Abreu
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Lydie Rubat
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | | | | | - Claire Horlock
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Sofia Matsumoto
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Sarah Williams
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Koval Smith
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Juliet Price
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Saket Srivastava
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Rehan Hussain
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | | | - William Day
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Elena Stevenson
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
| | - Meghan Madigan
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Jie Chen
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Ravin Khinder
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Shahed Miah
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Simon Walker
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Michael Ade-Onojobi
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Sabine Domining
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | | | | | | | - Farzin Farzaneh
- Cell and Gene Therapy, Kings (CGT-K), King’s College London, London SE5 9NU, UK
| | - Martin Pule
- Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK
- Deparment of Haematology, Cancer Institute, University College London, London WC1E 6BT, UK
- Corresponding author: Martin Pule, Autolus Limited, The MediaWorks, 191 Wood Lane, London W12 7FP, UK.
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3
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Kim H, Yi J, Yu J, Park J, Jang SK. A Simple and Effective Method to Concentrate Hepatitis C Virus: Aqueous Two-Phase System Allows Highly Efficient Enrichment of Enveloped Viruses. Viruses 2022; 14:v14091987. [PMID: 36146792 PMCID: PMC9503063 DOI: 10.3390/v14091987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 09/05/2022] [Accepted: 09/05/2022] [Indexed: 11/18/2022] Open
Abstract
To investigate the proliferation cycle of a virus, virus-host interaction, and pathogenesis of a virus, virion particles must be concentrated from the media of virus cell culture or the sera of virus-infected patients. Ultracentrifugation of the culture media is a standard method for concentrating virion particles. However, this method is time-consuming and requires special equipment (ultracentrifuge). Moreover, a large number of infectious viruses are lost during enrichment. We developed a new method of hepatitis C virus (HCV) concentration to overcome the issues associated with traditional methods of virus concentration. We used an aqueous two-phase system (ATPS) to concentrate the virus. HCV, which causes various liver diseases, such as liver fibrosis, cirrhosis, and hepatocellular carcinoma, was used as a model virus to test the efficacy and reliability of the ATPS. The efficiency of HCV concentration by the ATPS was approximately three times higher than that by ultracentrifugation. Moreover, the infectivity of the concentrated HCV, which is a labile virus, remained the same after concentration of the virus by the ATPS. Considering the simplicity and effectiveness of the ATPS, it is the method of choice for concentrating viruses.
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Affiliation(s)
- Heesun Kim
- Molecular Virology Laboratory, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Johan Yi
- Nanoparticle and Vesicle Laboratory, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jinbae Yu
- Molecular Virology Laboratory, Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jaesung Park
- Nanoparticle and Vesicle Laboratory, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
- Nanoparticle and Vesicle Laboratory, School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang 37673, Korea
- Correspondence: (J.P.); (S.K.J.)
| | - Sung Key Jang
- Molecular Virology Laboratory, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 37673, Korea
- Molecular Virology Laboratory, Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673, Korea
- Correspondence: (J.P.); (S.K.J.)
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4
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Savar NS, Vallet T, Arashkia A, Lundstrom K, Vignuzzi M, Mahmoudzadeh Niknam H. Packaging, Purification, and Titration of Replication-Deficient Semliki Forest Virus-Derived Particles as a Self-Amplifying mRNA Vaccine Vector. IRANIAN BIOMEDICAL JOURNAL 2022; 26:269-78. [PMID: 35468712 PMCID: PMC9432467 DOI: 10.52547/ibj.3535] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 08/23/2022] [Indexed: 12/02/2022]
Abstract
Background Self-amplifying mRNA is the next-generation vaccine platform with the potential advantages in efficacy and speed of development against infectious diseases and cancer. The main aim was to present optimized and rapid methods for Semliki Forest virus (SFV)-PD self-amplifying mRNA (SAM) preparation, its packaging, and titer determination. These protocols are provided for producing and harvesting the high yields of virus replicon particle (VRP)-packaged SAM for vaccine studies. Methods pSFV-PD-EGFP plasmid was linearized and subjected to in vitro transcription. Different concentrations of SFV-PD SAM were first transfected into human embryonic kidney 293 cells (HEK-293) and baby hamster kidney cell line 21 (BHK-21) cell lines, and EGFP expression at different time points was evaluated by fluorescent microscopy. Replicon particle packaging was achieved by co-transfection of SFV-PD SAM and pSFV-Helper2 RNA into BHK-21 cells. The VRPs were concentrated using ultrafiltration with 100 kDa cut-off. The titers of replicon particles were determined by reverse transcription quantitative real-time PCR (RT-qPCR). Results In vitro transcribed SAM encoding EGFP was successfully transfected and expressed in HEK-293 and BHK-21 cell lines. Higher levels of EGFP expression was observed in BHK-21 compared to HEK-293 cells showing more stable protein overexpression and VRP packaging. Using ultrafiltration, the high yields of purified SFV-PD-EGFP particles were rapidly obtained with only minor loss of replicon particles. Accurate and rapid titer determination of replication-deficient particles was achieved by RT-qPCR. Conclusion Using optimized methods for SAM transfection, VRP packaging, and concentration, high yields of SFV-PD VRPs could be produced and purified. The RT-qPCR demonstrated to be an accurate and rapid method for titer determination of replication deficient VRPs.
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Affiliation(s)
| | - Thomas Vallet
- Institut Pasteur, Viral Populations and Pathogenesis Unit, Centre National de la Recherche Scientifique UMR 3569, Paris, France
| | - Arash Arashkia
- Virology Department, Pasteur Institute of Iran, Tehran, Iran
| | | | - Marco Vignuzzi
- Institut Pasteur, Viral Populations and Pathogenesis Unit, Centre National de la Recherche Scientifique UMR 3569, Paris, France
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5
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Coroadinha AS. Cancer Gene Therapy: Development and Production of Lentiviral Vectors for Gene Therapy. Methods Mol Biol 2022; 2521:297-315. [PMID: 35733005 DOI: 10.1007/978-1-0716-2441-8_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Lentiviral vectors are among the most used vectors in gene therapy to treat pathologies of different origins, such as cancers, rare monogenic diseases or neurological disorders. This chapter provides an overview on lentiviral vector developments in terms of vector design and manufacture for gene therapy applications. The state of the art of vector production will be summarized face to the recent developments contributing to improve vector safety, efficacy and manufacturing robustness, focusing on human immunodeficiency virus 1 (HIV-1) based lentiviral vectors. Transient and stable production systems will be discussed highlighting recent advances in producer cell line development. Challenges in lentiviral vector development upstream and downstream will be addressed with a particular focus on the improvements undertaken to increase vector yields and production scalability.
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Affiliation(s)
- Ana S Coroadinha
- iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal.
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal.
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6
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Gomez-Gonzalez E, Fernandez-Muñoz B, Barriga-Rivera A, Navas-Garcia JM, Fernandez-Lizaranzu I, Munoz-Gonzalez FJ, Parrilla-Giraldez R, Requena-Lancharro D, Guerrero-Claro M, Gil-Gamboa P, Rosell-Valle C, Gomez-Gonzalez C, Mayorga-Buiza MJ, Martin-Lopez M, Muñoz O, Martin JCG, Lopez MIR, Aceituno-Castro J, Perales-Esteve MA, Puppo-Moreno A, Cozar FJG, Olvera-Collantes L, de Los Santos-Trigo S, Gomez E, Pernaute RS, Padillo-Ruiz J, Marquez-Rivas J. Hyperspectral image processing for the identification and quantification of lentiviral particles in fluid samples. Sci Rep 2021; 11:16201. [PMID: 34376765 PMCID: PMC8355230 DOI: 10.1038/s41598-021-95756-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 07/30/2021] [Indexed: 12/24/2022] Open
Abstract
Optical spectroscopic techniques have been commonly used to detect the presence of biofilm-forming pathogens (bacteria and fungi) in the agro-food industry. Recently, near-infrared (NIR) spectroscopy revealed that it is also possible to detect the presence of viruses in animal and vegetal tissues. Here we report a platform based on visible and NIR (VNIR) hyperspectral imaging for non-contact, reagent free detection and quantification of laboratory-engineered viral particles in fluid samples (liquid droplets and dry residue) using both partial least square-discriminant analysis and artificial feed-forward neural networks. The detection was successfully achieved in preparations of phosphate buffered solution and artificial saliva, with an equivalent pixel volume of 4 nL and lowest concentration of 800 TU·\documentclass[12pt]{minimal}
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\begin{document}$$\upmu$$\end{document}μL−1. This method constitutes an innovative approach that could be potentially used at point of care for rapid mass screening of viral infectious diseases and monitoring of the SARS-CoV-2 pandemic.
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Affiliation(s)
- Emilio Gomez-Gonzalez
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain. .,Institute of Biomedicine of Seville, 41013, Sevilla, Spain.
| | - Beatriz Fernandez-Muñoz
- Unidad de Producción y Reprogramación Celular (UPRC), Red Andaluza de Diseño y Traslación de Terapias Avanzadas, 41092, Sevilla, Spain
| | - Alejandro Barriga-Rivera
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain.,School of Biomedical Engineering, The University of Sydney, Sydney, NSW, 2006, Australia
| | | | - Isabel Fernandez-Lizaranzu
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain.,Institute of Biomedicine of Seville, 41013, Sevilla, Spain
| | - Francisco Javier Munoz-Gonzalez
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain
| | | | - Desiree Requena-Lancharro
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain
| | - Manuel Guerrero-Claro
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain
| | - Pedro Gil-Gamboa
- Department of Applied Physics III, School of Engineering, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain
| | - Cristina Rosell-Valle
- Institute of Biomedicine of Seville, 41013, Sevilla, Spain.,Unidad de Producción y Reprogramación Celular (UPRC), Red Andaluza de Diseño y Traslación de Terapias Avanzadas, 41092, Sevilla, Spain
| | - Carmen Gomez-Gonzalez
- Service of Intensive Care, University Hospital 'Virgen del Rocio', 41013, Sevilla, Spain
| | - Maria Jose Mayorga-Buiza
- Institute of Biomedicine of Seville, 41013, Sevilla, Spain.,Service of Anaesthesiology, University Hospital 'Virgen del Rocio', 41013, Sevilla, Spain
| | - Maria Martin-Lopez
- Institute of Biomedicine of Seville, 41013, Sevilla, Spain.,Unidad de Producción y Reprogramación Celular (UPRC), Red Andaluza de Diseño y Traslación de Terapias Avanzadas, 41092, Sevilla, Spain
| | - Olga Muñoz
- Instituto de Astrofísica de Andalucía, CSIC, 18008, Granada, Spain
| | | | - Maria Isabel Relimpio Lopez
- Department of Ophthalmology, University Hospital 'Virgen Macarena', 41009, Sevilla, Spain.,OftaRed, Institute of Health 'Carlos III', 28029, Madrid, Spain
| | - Jesus Aceituno-Castro
- Instituto de Astrofísica de Andalucía, CSIC, 18008, Granada, Spain.,Centro Astronomico Hispano Alemán, 04550, Almeria, Spain
| | - Manuel A Perales-Esteve
- Department of Electronic Engineering, School of Engineering, Universidad de Sevilla, 41092, Sevilla, Spain
| | - Antonio Puppo-Moreno
- Service of Intensive Care, University Hospital 'Virgen del Rocio', 41013, Sevilla, Spain
| | | | - Lucia Olvera-Collantes
- Instituto de Investigación E Innovación Biomedica de Cádiz (INIBICA), 11009, Cadiz, Spain
| | | | - Emilia Gomez
- Joint Research Centre, European Commission, 41092, Sevilla, Spain
| | - Rosario Sanchez Pernaute
- Unidad de Producción y Reprogramación Celular (UPRC), Red Andaluza de Diseño y Traslación de Terapias Avanzadas, 41092, Sevilla, Spain
| | - Javier Padillo-Ruiz
- Institute of Biomedicine of Seville, 41013, Sevilla, Spain.,Department of General Surgery, University Hospital 'Virgen del Rocío', 41013, Sevilla, Spain
| | - Javier Marquez-Rivas
- Institute of Biomedicine of Seville, 41013, Sevilla, Spain.,Service of Neurosurgery, University Hospital 'Virgen del Rocío', 41013, Sevilla, Spain.,Centre for Advanced Neurology, 41013, Sevilla, Spain
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7
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Abstract
HIV-1 envelope glycoproteins (Envs) bind to CD4 receptor and CCR5/CXCR4 coreceptor and mediate viral entry (Feng et al., 1996; Herschhorn et al., 2016, 2017; Kwong et al., 1998). HIV-1 Envs are the sole target of neutralizing antibodies and a main focus of vaccine development (Flemming et al., 2018). Here, we provide a step-by-step protocol to measure Env sensitivity to ligands, cold, and small molecules, as well as to study viral infectivity and to dissect parameters affecting HIV-1 Env function. For complete details on the use and execution of this protocol, please refer to Harris et al. (2020).
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Affiliation(s)
- Sneha Ratnapriya
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA
| | - Angela Chov
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA
| | - Alon Herschhorn
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA.,Microbiology, Immunology, and Cancer Biology Graduate Program, University of Minnesota, Minneapolis, MN 55455, USA.,The College of Veterinary Medicine Graduate Program, University of Minnesota, Minneapolis, MN 55455, USA.,Institute for Molecular Virology, University of Minnesota, Minneapolis, MN 55455, USA
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8
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Komatsu Y, Kakuya Y, Tomonaga K. Production of high-titer transmission-defective RNA virus-based episomal vector using tangential flow filtration. Microbiol Immunol 2020; 64:602-609. [PMID: 32644225 DOI: 10.1111/1348-0421.12831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 06/23/2020] [Accepted: 07/02/2020] [Indexed: 12/01/2022]
Abstract
In recent years, viral vector based in vivo gene delivery strategies have achieved a significant success in the treatment of genetic diseases. RNA virus-based episomal vector lacking viral glycoprotein gene (ΔG-REVec) is a nontransmissive gene delivery system that enables long-term gene expression in a variety of cell types in vitro, yet in vivo gene delivery has not been successful due to the difficulty in producing high titer vector. The present study showed that tangential flow filtration (TFF) can be effectively employed to increase the titer of ΔG-REVec. Concentration and diafiltration of ΔG-REVec using TFF significantly increased its titer without loss of infectious activity. Importantly, intracranial administration of high titer vector enabled persistent transgene expression in rodent brain.
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Affiliation(s)
- Yumiko Komatsu
- Laboratory of RNA Viruses, Department of Virus Research, Institute for Frontier Life and Medical Sciences (inFront), Kyoto University, Kyoto, Japan.,Keihanshin Consortium for Fostering the Next Generation of Global Leaders in Research, Kyoto University, Kyoto, Japan
| | - Yoji Kakuya
- Laboratory of RNA Viruses, Department of Virus Research, Institute for Frontier Life and Medical Sciences (inFront), Kyoto University, Kyoto, Japan.,Department of Mammalian Regulatory Network, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Keizo Tomonaga
- Laboratory of RNA Viruses, Department of Virus Research, Institute for Frontier Life and Medical Sciences (inFront), Kyoto University, Kyoto, Japan.,Department of Mammalian Regulatory Network, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.,Department of Molecular Virology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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9
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Boudeffa D, Bertin B, Biek A, Mormin M, Leseigneur F, Galy A, Merten OW. Toward a Scalable Purification Protocol of GaLV-TR-Pseudotyped Lentiviral Vectors. Hum Gene Ther Methods 2020; 30:153-171. [PMID: 31516018 DOI: 10.1089/hgtb.2019.076] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Lentiviral vectors (LV) that are used in research and development as well as in clinical trials are in majority vesicular stomatitis virus G glycoprotein (VSVg) pseudotyped. The predominance of this pseudotype choice for clinical gene therapy studies is largely due to a lack of purification schemes for pseudotypes other than VSVg. In this study, we report for the first time the development of a new downstream process protocol allowing high-yield production of stable and infectious gibbon ape leukemia virus (GaLV)-TR-LV particles. We identified critical conditions in tangential flow filtration (TFF) and chromatographic steps for preserving the infectivity/functionality of LV during purification. This was carried out by identifying for each step, the critical parameters affecting LV infectivity, including pH, salinity, presence of stabilizers, temperature, and by defining the optimal order of these steps. A three-step process was developed for GaLV-TR-LV purification consisting of one TFF and two chromatographic steps (ion-exchange chromatography and size exclusion chromatography) permitting recoveries of >27% of infectious particles. With this process, purified GaLV-pseudotyped LV enabled the transduction of 70% human CD34+ cells in the presence of the Vectofusin-1 peptide, whereas in the same conditions nonpurified vector transduced only 9% of the cells (multiplicity of infection 20). Our protocol will allow for the first time the purification of GaLV-TR-LV that are biologically active, stable, and with sufficient recovery in the perspective of preclinical studies and clinical applications. Obviously, further optimizations are required to improve final vector yields.
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Affiliation(s)
| | | | | | - Mirella Mormin
- Généthon, Evry, France.,Integrare Research Unit (UMR_S951), Généthon, Inserm, Université Evry Val-d'Essonne, Université Paris Saclay, EPHE, Evry, France
| | | | - Anne Galy
- Généthon, Evry, France.,Integrare Research Unit (UMR_S951), Généthon, Inserm, Université Evry Val-d'Essonne, Université Paris Saclay, EPHE, Evry, France
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10
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Tomás HA, Mestre DA, Rodrigues AF, Guerreiro MR, Carrondo MJT, Coroadinha AS. Improved GaLV-TR Glycoproteins to Pseudotype Lentiviral Vectors: Impact of Viral Protease Activity in the Production of LV Pseudotypes. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2019; 15:1-8. [PMID: 31528654 PMCID: PMC6742969 DOI: 10.1016/j.omtm.2019.08.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 08/08/2019] [Indexed: 01/03/2023]
Abstract
Lentiviral vectors (LVs) are excellent tools for gene transfer into mammalian cells. It is noteworthy that the first gene therapy treatment using LVs was approved for commercialization in 2017. The G glycoprotein from rhabdovirus vesicular stomatitis virus (VSV-G) is the glycoprotein most used to pseudotype LVs, due to its high efficiency in transducing several cell types and its resistance to viral vector purification and storage conditions. However, VSV-G expression induces cytotoxicity, which limits LV production to short periods. As alternative to VSV-G, γ-retrovirus glycoproteins (4070A derived, GaLV derived, and RD114 derived) have been used to pseudotype both γ-retroviral vectors (RVs) and LVs. These glycoproteins do not induce cytotoxicity, allowing the development of stable LV producer cells. Additionally, these LV pseudotypes present higher transduction efficiencies of hematopoietic stem cells when compared to VSV-G. Here, new 4070A-, RD114-TR-, and GaLV-TR-derived glycoproteins were developed with the aim of improving its cytoplasmic tail R-peptide cleavage and thus increase LV infectious titers. The new glycoproteins were tested in transient LV production using the wild-type or the less active T26S HIV-1 protease. The GaLV-TR-derived glycoproteins were able to overcome titer differences observed between LV production using wild-type and T26S protease. Additionally, these glycoproteins were even able to increase LV titers, evidencing its potential as an alternative glycoprotein to pseudotype LVs.
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Affiliation(s)
- Hélio A Tomás
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.,Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Daniel A Mestre
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.,Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Ana F Rodrigues
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.,Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Miguel R Guerreiro
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.,Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Manuel J T Carrondo
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.,Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Ana Sofia Coroadinha
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.,Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, New University of Lisbon, Lisbon, Portugal
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11
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Bolandi Z, Hosseini Rad SMA, Soudi S, Hashemi SM, Ghanbarian H. A simple and highly efficient method for transduction of human adipose-derived mesenchymal stem cells. J Cell Biochem 2019; 120:1726-1734. [PMID: 30362601 DOI: 10.1002/jcb.27453] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 07/13/2018] [Indexed: 01/24/2023]
Abstract
Mesenchymal stem cells (MSCs) are multipotent cells capable of differentiating into a wide range of cell types and provide a potential to transfer therapeutic protein in vivo, making them valuable candidates for gene therapy and cell therapy. However, using MSCs in in vivo is limited due to the low rate of transfection and transduction efficacy. Therefore, developing methods to efficiently transfer genes into MSCs would provide a number of opportunities for using them in the clinic. Here, we introduce a simple and robust method for efficient transduction of human adipose-derived MSCs by modification under the culture condition of human embryonic kidney cells 293 (HEK293T) and MSCs. Moreover, as a transduction enhancer, polybrene was replaced with Lipofectamine, a cationic lipid. Therefore, we showed that transduction of primary cells can be increased efficiently by modifying the culture condition.
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Affiliation(s)
- Zohreh Bolandi
- Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Sara Soudi
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Seyed Mahmoud Hashemi
- Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Department of Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hossein Ghanbarian
- Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Department of Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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12
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Larcombe MR, Manent J, Chen J, Mishra K, Liu X, Nefzger CM. Production of High-Titer Lentiviral Particles for Stable Genetic Modification of Mammalian Cells. Methods Mol Biol 2019; 1940:47-61. [PMID: 30788817 DOI: 10.1007/978-1-4939-9086-3_4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Lentiviral gene transfer technologies exploit the natural efficiency of viral transduction to integrate exogenous genes into mammalian cells. This provides a simple research tool for inducing transgene expression or endogenous gene knockdown in both dividing and nondividing cells. This chapter describes an improved protocol for polyethylenimine (PEI)-mediated multi-plasmid transfection and polyethylene glycol (PEG) precipitation to generate and concentrate lentiviral vectors.
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Affiliation(s)
- Michael R Larcombe
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, Australia
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Jan Manent
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, Australia
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Joseph Chen
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, Australia
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Ketan Mishra
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, Australia
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Xiaodong Liu
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, Australia
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Christian M Nefzger
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia.
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, Australia.
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia.
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD, Australia.
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13
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Richard V, Aubry M. Method for simple and rapid concentration of Zika virus particles from infected cell-culture supernatants. J Virol Methods 2018; 255:82-83. [PMID: 29474814 DOI: 10.1016/j.jviromet.2018.02.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 01/25/2018] [Accepted: 02/19/2018] [Indexed: 10/18/2022]
Abstract
Experimental studies on Zika virus (ZIKV) may require improvement of infectious titers in viral stocks obtained by cell culture amplification. The use of centrifugal filter devices to increase infectious titers of ZIKV from cell-culture supernatants is highlighted here. A mean gain of 2.33 ± 0.12 log10 DICT50/mL was easily and rapidly obtained with this process. This efficient method of ultrafiltration may be applied to other viruses and be useful in various experimental studies requiring high viral titers.
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Affiliation(s)
- Vaea Richard
- Institut Louis Malardé, PO Box 30, 98713 Papeete, French Polynesia; Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France.
| | - Maite Aubry
- Institut Louis Malardé, PO Box 30, 98713 Papeete, French Polynesia; Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France
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14
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The Superiority of Sucrose Cushion Centrifugation to Ultrafiltration and PEGylation in Generating High-Titer Lentivirus Particles and Transducing Stem Cells with Enhanced Efficiency. Mol Biotechnol 2018; 60:185-193. [DOI: 10.1007/s12033-017-0044-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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15
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Lee JY, Lee HH. A new chemical complex can rapidly concentrate lentivirus and significantly enhance gene transduction. Cytotechnology 2017; 70:193-201. [PMID: 28884364 DOI: 10.1007/s10616-017-0133-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Accepted: 08/05/2017] [Indexed: 11/30/2022] Open
Abstract
In this study, we developed a new purification method using chondroitin sulfate C (CSC) and protamine sulfate (PS) to concentrate lentivirus. To evaluate the efficiency of this new method, we compared it with several previously described purification protocols, including virus concentrated by ultracentrifugation (Ultra), precipitated by polyethylene glycol (PEG), and sedimented by CSC combined with polybrene (PB). After using the different methods to purify and concentrate equivalent amounts of lentivirus supernatant, the virus pellets precipitated by the different methods were resuspended using the equivalent volumes of DMEM. Subsequently, 10 μl of each lentivirus stock carrying EGFP gene was used to transduce two types of cells, human embryonic kidney 293T (HEK293T) cells and mouse mesenchymal stem cells (mMSC). It was obvious that HEK293T and mMSC appeared much intensiver green fluorescence through virus transduction from PS method than from other methods. To quantitate the transduction efficiency of the viruses, we examined virus titer in the cells after transduction using a real-time PCR-based analysis. Accordingly, we verified that PS precipitation could generate virus with a higher titer (4.39 × 108 IU/ml) than PB (2.43 × 108 IU/ml), Ultra (1.16 × 108 IU/ml), and PEG (0.56 × 108 IU/ml) in HEK293T cells. As for HEK293T cells in mMSC, the PS method also generated virus with a higher titer (4.66 × 108 IU/ml) than the Ultra method (2.36 × 108 IU/ml), and a much higher titer than those of the other chemical-based precipitation methods using PB (4.82 × 106 IU/ml) and PEG (8.98 × 104 IU/ml). Furthermore, the HEK293T cells and mMSC transduced by PS(1X)-virus appeared to have higher cell growth ratios, respectively, than the HEK293T cells and mMSC transduced by lentivirus using the other methods. We conclude that our new method for purifying lentivirus is cost-effective, time-saving, and highly efficient, and that lentivirus purification by this means could possibly be used to transduce a variety of cells, including stem cells.
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Affiliation(s)
- Jing-Yu Lee
- Department of Bioagricultural Sciences, National Chiayi University, No. 300 Syuefu Rd, Chiayi, 60004, Taiwan, ROC
| | - Hu-Hui Lee
- Department of Bioagricultural Sciences, National Chiayi University, No. 300 Syuefu Rd, Chiayi, 60004, Taiwan, ROC.
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16
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Taghiyar L, Hesaraki M, Sayahpour FA, Satarian L, Hosseini S, Aghdami N, Baghaban Eslaminejad M. Msh homeobox 1 ( Msx1)- and Msx2-overexpressing bone marrow-derived mesenchymal stem cells resemble blastema cells and enhance regeneration in mice. J Biol Chem 2017; 292:10520-10533. [PMID: 28461333 DOI: 10.1074/jbc.m116.774265] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 04/29/2017] [Indexed: 01/23/2023] Open
Abstract
Amputation of the proximal region in mammals is not followed by regeneration because blastema cells (BCs) and expression of regenerative genes, such as Msh homeobox (Msx) genes, are absent in this animal group. The lack of BCs and positional information in other cells is therefore the main obstacle to therapeutic approaches for limb regeneration. Hence, this study aimed to create blastema-like cells (BlCs) by overexpressing Msx1 and Msx2 genes in mouse bone marrow-derived mesenchymal stem cells (mBMSCs) to regenerate a proximally amputated digit tip. We transduced mBMSCs with Msx1 and Msx2 genes and compared osteogenic activity and expression levels of several Msx-regulated genes (Bmp4, Fgf8, and keratin 14 (K14)) in BlC groups, including MSX1, MSX2, and MSX1/2 (in a 1:1 ratio) with those in mBMSCs and BCs in vitro and in vivo following injection into the amputation site. We found that Msx gene overexpression increased expression of specific blastemal markers and enhanced the proliferation rate and osteogenesis of BlCs compared with mBMSCs and BCs via activation of Fgf8 and Bmp4 Histological analyses indicated full regrowth of digit tips in the Msx-overexpressing groups, particularly in MSX1/2, through endochondral ossification 6 weeks post-injection. In contrast, mBMSCs and BCs formed abnormal bone and nail. Full digit tip was regenerated only in the MSX1/2 group and was related to boosted Bmp4, Fgf8, and K14 gene expression and to limb-patterning properties resulting from Msx1 and Msx2 overexpression. We propose that Msx-transduced cells that can regenerate epithelial and mesenchymal tissues may potentially be utilized in limb regeneration.
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Affiliation(s)
- Leila Taghiyar
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and.,the Department of Developmental Biology, University of Science and Culture, Tehran 13145-871, Iran
| | - Mahdi Hesaraki
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Forough Azam Sayahpour
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Leila Satarian
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Samaneh Hosseini
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Naser Aghdami
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
| | - Mohamadreza Baghaban Eslaminejad
- From the Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, Academic Center for Education, Culture and Research (ACECR), Tehran 1665659911, Iran and
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17
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Li WF, Yang K, Zhu P, Zhao HQ, Song YH, Liu KC, Huang WF. Genistein Ameliorates Ischemia/Reperfusion-Induced Renal Injury in a SIRT1-Dependent Manner. Nutrients 2017; 9:nu9040403. [PMID: 28425936 PMCID: PMC5409742 DOI: 10.3390/nu9040403] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 04/12/2017] [Accepted: 04/17/2017] [Indexed: 12/29/2022] Open
Abstract
Renal ischemia/reperfusion (I/R) injury continues to be a complicated situation in clinical practice. Genistein, the main isoflavone found in soy products, is known to possess a wide spectrum of biochemical and pharmacological activities. However, the protective effect of genistein on renal I/R injury has not been well investigated. In the current study, we explore whether genistein exhibits its renal-protective effects through SIRT1 (Sirtuin 1) in I/R-induced mice model. We found the treatment of genistein significantly reduced renal I/R-induced cell death, simultaneously stimulating renal cell proliferation. Meanwhile, SIRT1 expression was up-regulated following the administration of genistein in renal region. Furthermore, pharmacological inhibition or shRNA-mediated depletion of SIRT1 significantly reversed the protective effect of genistein on renal dysfunction, cellular damage, apoptosis, and proliferation following I/R injury, suggesting an indispensible role of the increased SIRT1 expression and activity in this process. Meanwhile, the reduced p53 and p21 expression and increased PCNA (Proliferating Cell Nuclear Antigen) expression were blocked after the depletion of SIRT1 compared with the genistein treatment group in the renal I/R process. Hence, our results provided further experimental basis for the potential use of genistein for the treatment of kidney disease with deficiency of SIRT1 activity.
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Affiliation(s)
- Wei-Fang Li
- Medical College, China Three Gorges University, Yichang 443002, China.
| | - Kang Yang
- Medical College, China Three Gorges University, Yichang 443002, China.
| | - Ping Zhu
- Department of Medicine, the First College of Clinical Medical Science, China Three Gorges University, Yichang 443002, China.
| | - Hong-Qian Zhao
- Medical College, China Three Gorges University, Yichang 443002, China.
| | - Yin-Hong Song
- Medical College, China Three Gorges University, Yichang 443002, China.
| | - Kuan-Can Liu
- Institute for Laboratory Medicine, Fuzhou General Hospital, PLA, Fuzhou 350025, China.
- Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA.
- Dongfang Hospital, Xiamen University, Fuzhou 350025, China.
| | - Wei-Feng Huang
- Medical College, China Three Gorges University, Yichang 443002, China.
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18
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Huss D, Lansford R. Fluorescent Quail: A Transgenic Model System for the Dynamic Study of Avian Development. Methods Mol Biol 2017; 1650:125-147. [PMID: 28809018 DOI: 10.1007/978-1-4939-7216-6_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Real-time four-dimensional (4D, xyzt) imaging of cultured avian embryos is an ideal method for investigating the complex movements of cells and tissues during early morphogenesis. While methods that transiently label cells, such as electroporation, are highly useful for dynamic imaging, they can also be limiting due to the number and type of cells that can be effectively targeted. In contrast, the heritable, stable, and long-term expression of a fluorescent protein driven by the exogenous promoter of a transgene overcomes these challenges. We have used lentiviral vectors to produce several novel transgenic quail lines that express fluorescent proteins either ubiquitously or in a cell-specific manner. These lines have proven to be useful models for dynamic imaging and analysis. Here, we provide detailed protocols for generating transgenic quail with the emphasis on producing high titer lentivirus , effectively introducing it into the early embryo and efficiently screening for G1 founder birds .
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Affiliation(s)
- David Huss
- Developmental Neuroscience Program, Department of Radiology, Saban Research Institute, Children's Hospital Los Angeles, 4661 Sunset Boulevard MS #135, Los Angeles, CA, 90027, USA.,Translational Imaging Center, University of Southern California, Los Angeles, CA, 90089, USA
| | - Rusty Lansford
- Developmental Neuroscience Program, Department of Radiology, Saban Research Institute, Children's Hospital Los Angeles, 4661 Sunset Boulevard MS #135, Los Angeles, CA, 90027, USA. .,Keck School of Medicine, University of Southern California, Los Angeles, CA, 90033, USA.
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19
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Challenges of up-scaling lentivirus production and processing. J Biotechnol 2016; 240:23-30. [PMID: 27769802 DOI: 10.1016/j.jbiotec.2016.10.016] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 10/10/2016] [Accepted: 10/17/2016] [Indexed: 11/22/2022]
Abstract
Lentiviruses are becoming an increasingly popular choice of gene transfer vehicle for use in the treatment of a variety of genetic and acquired human diseases. As research progresses from basic studies into pre-clinical and clinical phases, there is a growing demand for large volumes of high purity, concentrated vector, and accordingly, the means to produce such quantities. Unlike other viral vectors, lentiviruses are difficult to produce using stable cell lines, therefore transient transfection of adherent cell lines is conventionally used, and this method has proven challenging to up-scale. Furthermore, with the required increases in the volume of vector needed for larger animal and human use, comes the need for more efficient and sophisticated supernatant purification and concentration techniques. This review presents the challenges of up-scaling lentivirus production and processing approaches, novel systems for overcoming these issues, and the quality assessments recommended for producing a clinical grade lentiviral gene therapy product.
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20
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Panjwani MK, Smith JB, Schutsky K, Gnanandarajah J, O'Connor CM, Powell DJ, Mason NJ. Feasibility and Safety of RNA-transfected CD20-specific Chimeric Antigen Receptor T Cells in Dogs with Spontaneous B Cell Lymphoma. Mol Ther 2016; 24:1602-14. [PMID: 27401141 DOI: 10.1038/mt.2016.146] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/05/2016] [Indexed: 12/21/2022] Open
Abstract
Preclinical murine models of chimeric antigen receptor (CAR) T cell therapy are widely applied, but are greatly limited by their inability to model the complex human tumor microenvironment and adequately predict safety and efficacy in patients. We therefore sought to develop a system that would enable us to evaluate CAR T cell therapies in dogs with spontaneous cancers. We developed an expansion methodology that yields large numbers of canine T cells from normal or lymphoma-diseased dogs. mRNA electroporation was utilized to express a first-generation canine CD20-specific CAR in expanded T cells. The canine CD20 (cCD20) CAR expression was efficient and transient, and electroporated T cells exhibited antigen-specific interferon-gamma (IFN-γ) secretion and lysed cCD20+ targets. In a first-in-canine study, autologous cCD20-ζ CAR T cells were administered to a dog with relapsed B cell lymphoma. Treatment was well tolerated and led to a modest, but transient, antitumor activity, suggesting that stable CAR expression will be necessary for durable clinical remissions. Our study establishes the methodologies necessary to evaluate CAR T cell therapy in dogs with spontaneous malignancies and lays the foundation for use of outbred canine cancer patients to evaluate the safety and efficacy of next-generation CAR therapies and their optimization prior to translation into humans.
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Affiliation(s)
- M Kazim Panjwani
- Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jenessa B Smith
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Keith Schutsky
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Josephine Gnanandarajah
- Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Daniel J Powell
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Nicola J Mason
- Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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21
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Merten OW, Hebben M, Bovolenta C. Production of lentiviral vectors. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2016; 3:16017. [PMID: 27110581 PMCID: PMC4830361 DOI: 10.1038/mtm.2016.17] [Citation(s) in RCA: 183] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 12/08/2015] [Accepted: 12/09/2015] [Indexed: 12/13/2022]
Abstract
Lentiviral vectors (LV) have seen considerably increase in use as gene therapy vectors for the treatment of acquired and inherited diseases. This review presents the state of the art of the production of these vectors with particular emphasis on their large-scale production for clinical purposes. In contrast to oncoretroviral vectors, which are produced using stable producer cell lines, clinical-grade LV are in most of the cases produced by transient transfection of 293 or 293T cells grown in cell factories. However, more recent developments, also, tend to use hollow fiber reactor, suspension culture processes, and the implementation of stable producer cell lines. As is customary for the biotech industry, rather sophisticated downstream processing protocols have been established to remove any undesirable process-derived contaminant, such as plasmid or host cell DNA or host cell proteins. This review compares published large-scale production and purification processes of LV and presents their process performances. Furthermore, developments in the domain of stable cell lines and their way to the use of production vehicles of clinical material will be presented.
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Affiliation(s)
| | | | - Chiara Bovolenta
- New Technologies Unit, Research Division, MolMed S.p.A. , Milan, Italy
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22
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Zhu G, Yi X, Haferkamp S, Hesbacher S, Li C, Goebeler M, Gao T, Houben R, Schrama D. Combination with γ-secretase inhibitor prolongs treatment efficacy of BRAF inhibitor in BRAF-mutated melanoma cells. Cancer Lett 2016; 376:43-52. [PMID: 27000992 DOI: 10.1016/j.canlet.2016.03.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 03/12/2016] [Accepted: 03/14/2016] [Indexed: 12/19/2022]
Abstract
Oncogenic triggering of the MAPK pathway in melanocytes results in senescence, and senescence escape is considered as one critical step for melanocytic transformation. In melanoma, induction of a senescent-like state by BRAF-inhibitors (BRAFi) in a fraction of treated cells - instead of killing - contributes to the repression of tumor growth, but may also provide a source for relapse. Here, we demonstrate that NOTCH activation in melanocytes is not only growth-promoting but it also protects these cells against oncogene-induced senescence. In turn, treatment of melanoma cells with an inhibitor of the NOTCH-activating enzyme γ-secretase led to induction of a senescent-like status in a fraction of the cells but overall achieved only a moderate inhibition of melanoma cell growth. However, combination of γ-secretase inhibitor (GSI) with BRAFi markedly increased the treatment efficacy particularly in long-term culture. Moreover, even melanoma cells starting to regrow after continuous BRAFi treatment - the major problem of BRAFi therapy in patients - can still be affected by the combination treatment. Thus, combining GSI with BRAFi increases the therapeutic efficacy by, at least partially, prolonging the senescent-like state of treated cells.
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Affiliation(s)
- Guannan Zhu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China; Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - Xiuli Yi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | | | - Sonja Hesbacher
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Matthias Goebeler
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - Tianwen Gao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
| | - Roland Houben
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany
| | - David Schrama
- Department of Dermatology, University Hospital Würzburg, Würzburg, Germany.
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23
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Stability, biophysical properties and effect of ultracentrifugation and diafiltration on measles virus and mumps virus. Arch Virol 2016; 161:1455-67. [PMID: 26935920 DOI: 10.1007/s00705-016-2801-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 02/17/2016] [Indexed: 11/27/2022]
Abstract
Measles virus and mumps virus (MeV and MuV) are enveloped RNA viruses used for production of live attenuated vaccines for prophylaxis of measles and mumps disease, respectively. For biotechnological production of and basic research on these viruses, the preparation of highly purified and infectious viruses is a prerequisite, and to meet that aim, knowledge of their stability and biophysical properties is crucial. Our goal was to carry out a detailed investigation of the stability of MeV and MuV under various pH, temperature, shear stress, filtration and storage conditions, as well as to evaluate two commonly used purification techniques, ultracentrifugation and diafiltration, with regard to their efficiency and effect on virus properties. Virus titers were estimated by CCID50 assay, particle size and concentration were measured by Nanoparticle tracking analysis (NTA) measurements, and the host cell protein content was determined by ELISA. The results demonstrated the stability of MuV and MeV at pH <9 and above pH 4 and 5, respectively, and aggregation was observed at pH >9. Storage without stabilizer did not result in structural changes, but the reduction in infectivity after 24 hours was significant at +37 °C. Vortexing of the viruses resulted in significant particle degradation, leading to lower virus titers, whereas pipetting had much less impact on virus viability. Diafiltration resulted in higher recovery of both total and infectious virus particles than ultracentrifugation. These results provide important data for research on all upstream and downstream processes on these two viruses regarding biotechnological production and basic research.
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Richard V, Viallon J, Cao-Lormeau VM. Use of Centrifugal Filter Devices to Concentrate Dengue Virus in Mosquito per os Infection Experiments. PLoS One 2015; 10:e0138161. [PMID: 26372347 PMCID: PMC4570664 DOI: 10.1371/journal.pone.0138161] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 08/25/2015] [Indexed: 12/15/2022] Open
Abstract
Dengue virus (DENV) is an arbovirus transmitted to humans by the bite of infected Aedes mosquitoes. Experimental per os infection of mosquitoes with DENV is usually a preliminary step in virus/vector studies but it requires being able to prepare artificial blood-meals with high virus titers. We report here the convenient use of centrifugal filter devices to quickly concentrate DENV particles in cell-culture supernatants. The median viral titer in concentrated-supernatants was 8.50 log10 TCID50/mL. By using these DENV concentrated-supernatants to prepare infectious blood-meals in Aedes aegypti per os infection experiments, we obtained a mean mosquito-infection rate of 94%. We also evaluated the use of centrifugal filter devices to recover DENV particles from non-infectious blood-meals presented to infected mosquitoes through a feeding membrane to collect their saliva.
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Affiliation(s)
- Vaea Richard
- Institut Louis Malardé, Papeete, French Polynesia
- * E-mail:
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An optimized method for high-titer lentivirus preparations without ultracentrifugation. Sci Rep 2015; 5:13875. [PMID: 26348152 PMCID: PMC4562269 DOI: 10.1038/srep13875] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 08/13/2015] [Indexed: 12/25/2022] Open
Abstract
Lentiviral technology has proven to be a powerful tool to express exogenous genes in dividing and non-dividing cells. Currently, most protocols for generating high-titer lentivirus require ultracentrifugation, which can be an instrumental barrier for routine operations in a laboratory. In this study, the effect of relative centrifugal force (RCF) on the concentration efficiency of the lentivirus was systematically explored, and it was found that sucrose gradient centrifugation with a relatively low speed (≤10,000 g) robustly produces a high-titer virus (up to 2 × 108 TU/ml). The optimal sucrose concentration is 10%, and the recovery rate of the functional virus is greater than 80%. The infection efficiency of both concentrated and un-concentrated lentivirus decreases rapidly when the viruses are stored at 4 °C (τ ≈ 1.3 days) or subjected to multiple freeze-thaw cycles (τ = 1.1 rounds). In summary, we describe an efficient and easy-to-handle protocol for high-titer lentivirus purification.
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Sullivan HA, Wickersham IR. Concentration and purification of rabies viral and lentiviral vectors. Cold Spring Harb Protoc 2015; 2015:386-91. [PMID: 25834256 DOI: 10.1101/pdb.prot075887] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Rabies viral and lentiviral vectors are very useful tools for neuroscientists, but high titer and purity are critical for in vivo applications. Here we present a protocol for concentration and purification of viral stocks by ultracentrifugation on a sucrose step gradient to remove impurities of both higher and lower densities than the virus itself, with sucrose removed by a subsequent pelleting step. The final stocks are concentrated in volume by a factor of up to 1000, with higher expected purity than is obtained following previously published protocols for preparing G-deleted rabies viral vectors.
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Affiliation(s)
- Heather A Sullivan
- Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Ian R Wickersham
- McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Sepúlveda JC, Tomé M, Fernández ME, Delgado M, Campisi J, Bernad A, González MA. Cell senescence abrogates the therapeutic potential of human mesenchymal stem cells in the lethal endotoxemia model. Stem Cells 2015; 32:1865-77. [PMID: 24496748 DOI: 10.1002/stem.1654] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 01/12/2014] [Indexed: 01/01/2023]
Abstract
Mesenchymal stem cells (MSCs) possess unique paracrine and immunosuppressive properties, which make them useful candidates for cellular therapy. Here, we address how cellular senescence influences the therapeutic potential of human MSCs (hMSCs). Senescence was induced in bone marrow-derived hMSC cultures with gamma irradiation. Control and senescent cells were tested for their immunoregulatory activity in vitro and in vivo, and an extensive molecular characterization of the phenotypic changes induced by senescence was performed. We also compared the gene expression profiles of senescent hMSCs with a collection of hMSCs used in an ongoing clinical study of Graft Versus Host disease (GVHD). Our results show that senescence induces extensive phenotypic changes in hMSCs and abrogates their protective activity in a murine model of LPS-induced lethal endotoxemia. Although senescent hMSCs retain an ability to regulate the inflammatory response on macrophages in vitro, and, in part retain their capacity to significantly inhibit lymphocyte proliferation, they have a severely impaired migratory capacity in response to proinflammatory signals, which is associated with an inhibition of the AP-1 pathway. Additionally, expression analysis identified PLEC, C8orf48, TRPC4, and ZNF14, as differentially regulated genes in senescent hMSCs that were similarly regulated in those hMSCs which failed to produce a therapeutic effect in a GVHD trial. All the observed phenotypic alterations were confirmed in replicative-senescent hMSCs. In conclusion, this study highlights important changes in the immunomodulatory phenotype of senescent hMSCs and provides candidate gene signatures which may be useful to evaluate the therapeutic potential of hMSCs used in future clinical studies.
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Affiliation(s)
- Juan Carlos Sepúlveda
- Department of Cardiovascular Development and Repair, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
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TANG YONG, GARSON KENNETH, LI LI, VANDERHYDEN BARBARAC. Optimization of lentiviral vector production using polyethylenimine-mediated transfection. Oncol Lett 2015; 9:55-62. [PMID: 25435933 PMCID: PMC4246624 DOI: 10.3892/ol.2014.2684] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Accepted: 10/15/2014] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to optimize the polyethylenimine (PEI)-mediated transfection method in order to simplify the efficient production of lentiviral vectors (LvVs), and to compare the CaPO4- and PEI-mediated transfection methods for producing LvVs. Different titration methods of LvV stocks, as well as different culture media, culture durations, cell densities and DNA quantities were compared to obtain an optimized procedure for the production of LvVs. Optimization of the production method for LvVs was achieved using PEI-mediated transient transfections. Serum-free Opti-MEM® was used to directly produce LvVs that could be harvested 48 h after transfection. Furthermore, a cell density of 15×106 cells/10-cm plate and a DNA concentration of 1X were selected for the optimum production of LvVs. The optimized LvV titration method was simple and direct; it involved LvVs carrying fluorescent reporters, which proved to be faster than the standard methods but equally as sensitive. In conclusion, a scalable process for production of LvVs by PEI-mediated transfection was established and optimized. The optimized PEI-mediated transfection method was easy to use, as well as providing greater reliability with a higher degree of reproducibility and consistency. Despite using less DNA, the PEI-mediated transfection method resulted in viral titers that were the same as those achieved using the CaPO4-mediated method.
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Affiliation(s)
- YONG TANG
- Department of Urology, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - KENNETH GARSON
- Centre for Cancer Therapeutics, Ottawa Health Research Institute, University of Ottawa, Ottawa, Ontario K1H 8L6, Canada
| | - LI LI
- Department of Gynecologic Oncology, Affiliated Cancer Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - BARBARA C. VANDERHYDEN
- Department of Cellular and Molecular Medicine, Centre for Cancer Therapeutics, Ottawa Health Research Institute, University of Ottawa, Ottawa, ON K1H 8L6, Canada
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Park M, Lee BS, Jeon SH, Nam HJ, Lee G, Kim CH, Cho H, Lee JH. A novel isoform of met receptor tyrosine kinase blocks hepatocyte growth factor/Met signaling and stimulates skeletal muscle cell differentiation. J Biol Chem 2014; 290:1804-17. [PMID: 25471370 DOI: 10.1074/jbc.m114.596957] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Hepatocyte growth factor (HGF) and its receptor, Met, regulate skeletal muscle differentiation. In the present study, we identified a novel alternatively spliced isoform of Met lacking exon 13 (designated Δ13Met), which is expressed mainly in human skeletal muscle. Alternative splicing yielded a truncated Met having extracellular domain only, suggesting an inhibitory role. Indeed, Δ13Met expression led to a decrease in HGF-induced tyrosine phosphorylation of Met and ERK phosphorylation, as well as cell proliferation and migration via sequestration of HGF. Interestingly, in human primary myoblasts undergoing differentiation, Δ13Met mRNA and protein levels were rapidly increased, concomitantly with a decrease in wild type Met mRNA and protein. Inhibition of Δ13Met with siRNA led to a decreased differentiation, whereas its overexpression potentiated differentiation of human primary myoblasts. Furthermore, in notexin-induced mouse injury model, exogenous Δ13Met expression enhanced regeneration of skeletal muscle, further confirming a stimulatory role of the isoform in muscle cell differentiation. In summary, we identified a novel alternatively spliced inhibitory isoform of Met that stimulates muscle cell differentiation, which confers a new means to control muscle differentiation and/or regeneration.
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Affiliation(s)
- Minseon Park
- From the Departments of Biochemistry and Molecular Biology
| | | | - Soung-Hoo Jeon
- From the Departments of Biochemistry and Molecular Biology
| | - Hyun-Ja Nam
- From the Departments of Biochemistry and Molecular Biology
| | - Gwang Lee
- Physiology, Ajou University School of Medicine, Yeongtong-gu, Suwon 443-721, Korea
| | | | - Hyeseong Cho
- From the Departments of Biochemistry and Molecular Biology
| | - Jae-Ho Lee
- From the Departments of Biochemistry and Molecular Biology,
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Zhang W, Zhang X, Ling J, Liu W, Zhang X, Ma J, Zheng J. Proliferation and odontogenic differentiation of BMP2 gene‑transfected stem cells from human tooth apical papilla: an in vitro study. Int J Mol Med 2014; 34:1004-12. [PMID: 25070743 PMCID: PMC4152145 DOI: 10.3892/ijmm.2014.1862] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 07/09/2014] [Indexed: 01/09/2023] Open
Abstract
Stem cells from the apical papilla (SCAP) have odontogenic potential, which plays a pivotal role in the root dentin development of permanent teeth. Human bone morphogenetic protein 2 (BMP2) is a well-known gene that participates in regulating the odontogenic differentiation of dental tissue-derived stem cells. However, little is known regarding the effects of the BMP2 gene on the proliferation and odontogenic differentiation of SCAP. This study aimed to evaluate the odontogenic differentiation potential of lentiviral-mediated BMP2 gene-transfected human SCAP (SCAP/BMP2) in vitro. SCAP were isolated by enzymatic dissociation of human teeth apical papillae. The multipotential of SCAP was verified by their osteogenic and adipogenic differentiation characteristics. The phenotype of SCAP was evaluated by flow cytometry (FCM). The proliferation status of the blank vector-transfected SCAP (SCAP/Vector) and SCAP/BMP2 was analyzed by a cell counting kit-8 (CCK-8). Odontogenic genes, including alkaline phosphatase (ALP), osteocalcin (OCN), dentin sialophosphoprotein (DSPP) and dentin matrix protein 1 (DMP1) of the two groups of cells were evaluated by quantitative polymerase chain reaction (qPCR). ALP staining and alizarin red (AR) staining of the cells was performed on the 16th day after transfection. In vitro results of CCK-8, qPCR, ALP and AR staining demonstrated that: i) SCAP/BMP2 had a comparable proliferation rate to SCAP/Vector; ii) SCAP/BMP2 presented significantly better potential to differentiate into odontoblasts compared to SCAP/Vector by upregulating ALP, OCN, DSPP and DMP1 genes; iii) more ALP granules and mineralized deposits were formed by SCAP/BMP2 as compared to SCAP/Vector. The results suggested that lentiviral-mediated BMP2 gene transfection enhances the odontogenic differentiation capacity of human SCAP in vitro.
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Affiliation(s)
- Wen Zhang
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
| | - Xiaolei Zhang
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
| | - Junqi Ling
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
| | - Wei Liu
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
| | - Xinchun Zhang
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
| | - Jinglei Ma
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
| | - Jianmao Zheng
- Department of Operative Dentistry and Endodontics, Guanghua School and Hospital of Stomatology and Guangdong Province Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510080, P.R. China
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High levels of SOX5 decrease proliferative capacity of human B cells, but permit plasmablast differentiation. PLoS One 2014; 9:e100328. [PMID: 24945754 PMCID: PMC4063782 DOI: 10.1371/journal.pone.0100328] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 05/23/2014] [Indexed: 11/19/2022] Open
Abstract
Currently very little is known about the differential expression and function of the transcription factor SOX5 during B cell maturation. We identified two new splice variants of SOX5 in human B cells, encoding the known L-SOX5B isoform and a new shorter isoform L-SOX5F. The SOX5 transcripts are highly expressed during late stages of B-cell differentiation, including atypical memory B cells, activated CD21low B cells and germinal center B cells of tonsils. In tonsillar sections SOX5 expression was predominantly polarized to centrocytes within the light zone. After in vitro stimulation, SOX5 expression was down-regulated during proliferation while high expression levels were permissible for plasmablast differentiation. Overexpression of L-SOX5F in human primary B lymphocytes resulted in reduced proliferation, less survival of CD138neg B cells, but comparable numbers of CD138+CD38hi plasmablasts compared to control cells. Thus, our findings describe for the first time a functional role of SOX5 during late B cell development reducing the proliferative capacity and thus potentially affecting the differentiation of B cells during the germinal center response.
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32
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Manufacturing of viral vectors: part II. Downstream processing and safety aspects. ACTA ACUST UNITED AC 2014. [DOI: 10.4155/pbp.14.15] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Production, purification and titration of a lentivirus-based vector for gene delivery purposes. Cytotechnology 2014; 66:1031-8. [PMID: 24599752 DOI: 10.1007/s10616-013-9652-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 09/29/2013] [Indexed: 01/21/2023] Open
Abstract
Viral vectors are valuable tools to deliver genetic materials into cells. Vectors derived from human immunodeficiency virus type 1 are being widely used for gene delivery, mainly because they are able to transduce both dividing and non-dividing cells which leads to stable and long term gene expression. In addition, these types of vectors are safe, with low toxicity, high stability and cell type specificity. Therefore, this work was aimed to produce lentivirus-based vector using a three-plasmid system. To produce this system, the eGFP marker gene was cloned into the plasmid pWPXLd. Subsequently, this vector plasmid, along with packaging plasmids, psPAX2 and envelope plasmid, pMD2.G, was co-transfected into packaging cell line (293T) using calcium phosphate method. 48 h post transfection, the constructed viral vector was harvested, purified and concentrated and stored at -80 °C for next experiments. The titration of the vector was carried out, using ELISA, flowcytometry, and fluorescent microscopy. Finally, transduction of HEK-293T, CHO, HepG2, MCF-7, MEFs and Jurkat cell lines was carried out with indicated cell numbers and multiplicities of infections of the vector in the presence of polybrene. Using this system, high titer lentivirus at titers of up to 2 × 10(8) transducing units/ml (TU/ml) was successfully generated and its transduction efficacy was improved by seven to over 20-fold in various cell types. We demonstrate the applicability of this vector for the efficient transduction of dividing and non-dividing cells, including HEK-293T, CHO, HepG2, MCF-7, MEFs and Jurkat cell line. Transduction efficiency yielded titers of (6.3 ± 1.2) 10(5) TU/ml. Furthermore, lentivirus transferred transgene was expressed at high level in the target cells and expression was followed until 90 days after transduction. Thus, the vector generated in this work, might be able to deliver the transgene into a wide range of mammalian cells.
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Cribbs AP, Kennedy A, Gregory B, Brennan FM. Simplified production and concentration of lentiviral vectors to achieve high transduction in primary human T cells. BMC Biotechnol 2013; 13:98. [PMID: 24215295 PMCID: PMC3830501 DOI: 10.1186/1472-6750-13-98] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 11/07/2013] [Indexed: 02/07/2023] Open
Abstract
Background Lentiviral vectors have emerged as efficient vehicles for transgene delivery in both dividing and non-dividing cells. A number of different modifications in vector design have increased biosafety and transgene expression. However, despite these advances, the transduction of primary human T cells is still challenging and methods to achieve efficient gene transfer are often expensive and time-consuming. Results Here we present a simple optimised protocol for the generation and transduction of lentivirus in primary human CD45RA+ T cells. We show that generation of high-titre lentivirus with improved primary T cell transduction is dependent upon optimised ultracentrifuge speed during viral concentration. Moreover, we demonstrate that transduction efficiency can be increased with simple modifications to the culturing conditions. Overall, a transduction efficiency of up to 89% in primary human CD45RA+ cells is achievable when these modifications are used in conjunction. Conclusion The optimised protocol described here is easy to implement and should facilitate the production of high-titre lentivirus with superior transduction efficiency in primary human T cells without the need for further purification methods.
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Affiliation(s)
- Adam P Cribbs
- Kennedy Institute of Rheumatology, Roosevelt Drive, Headington OX3 7FY, Oxford, UK.
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35
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Lu G, Matsuura SE, Barrientos A, Scott WA. HIV-1 infection is blocked at an early stage in cells devoid of mitochondrial DNA. PLoS One 2013; 8:e78035. [PMID: 24205077 PMCID: PMC3804459 DOI: 10.1371/journal.pone.0078035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 09/16/2013] [Indexed: 11/19/2022] Open
Abstract
Human immunodeficiency virus type I (HIV-1) exploits various host cellular pathways for efficient infection. Here we report that the absence of mitochondrial DNA (mtDNA) in ρ(0) cells markedly attenuates HIV-1 infection. Importantly, reduced infection efficiency in ρ(0) cells is not simply the result of impaired oxidative phosphorylation (OXPHOS) because pharmacological OXPHOS inhibition did not inhibit HIV-1 infection. Analysis of the early steps of virus infection by real-time PCR quantification of stage-specific HIV-1 DNA products in the infected ρ(0) and parental cell line have allowed us to conclude that HIV-1 infection in ρ(0) cells is blocked at the steps that occur after reverse transcription and prior to nuclear import. Additionally, confocal fluorescence microscope analysis showed that the majority of viral complexes containing HIV-1 p24 co-localize with mitochondria in target cells, suggesting an interaction between the two. Collectively, our data strongly indicate that mitochondria play an important role during early stages of HIV-1 infection, probably through direct association with HIV-1 intracellular complexes.
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Affiliation(s)
- Gaofei Lu
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Suzanne E. Matsuura
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Antoni Barrientos
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- * E-mail:
| | - Walter A. Scott
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, Florida, United States of America
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Lesniak MS, Kelleher E, Pardoll D, Cui Y. Targeted gene therapy to antigen-presenting cells in the central nervous system using hematopoietic stem cells. Neurol Res 2013; 27:820-6. [PMID: 16354542 DOI: 10.1179/016164105x49454] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
BACKGROUND Hematopoietic stem cells (HSC) have been previously used as vectors for gene therapy of systemic disease. The effectiveness of HSC-mediated gene therapy largely depends on efficient gene delivery into long-term repopulating progenitors and targeted transgene expression in an appropriate progeny of the transduced pluripotent HSCs. In the present study, we examined the feasibility of using HSC transduced with self-inactivating (SIN) lentiviral vectors for the delivery of gene therapy to the central nervous system (CNS). MATERIAL AND METHODS We constructed two SIN lentiviral vectors, EF.GFP and DR.GFP, to express the green fluorescent protein (GFP) gene controlled solely by the promoter of either a housekeeping gene EF-1alpha or the human HLA-DRalpha gene, which is selectively expressed in antigen-presenting cells. RESULTS We demonstrated that both vectors efficiently transduced human pluripotent CD34+ cells capable of engrafting NOD/SCID mice. Only the DR.GFP vector mediated transgene expression in the murine CNS containing human HLA-DR+ cells. These cells express surface markers characteristic of resident CNS microglia. Furthermore, human dendritic cells derived from transduced and engrafted human cells potently stimulated allogeneic T cell proliferation. CONCLUSIONS The present study demonstrated successful targeting of transgene expression to CNS microglia after stable gene transduction of pluripotent HSC.
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Affiliation(s)
- Maciej S Lesniak
- Section of Neurosurgery, The University of Chicago Pritzker School of Medicine, USA.
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Papanikolaou E, Kontostathi G, Drakopoulou E, Georgomanoli M, Stamateris E, Vougas K, Vlahou A, Maloy A, Ware M, Anagnou NP. Characterization and comparative performance of lentiviral vector preparations concentrated by either one-step ultrafiltration or ultracentrifugation. Virus Res 2013; 175:1-11. [DOI: 10.1016/j.virusres.2013.03.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 03/23/2013] [Accepted: 03/25/2013] [Indexed: 11/30/2022]
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Stehbens S, Pemble H, Murrow L, Wittmann T. Imaging intracellular protein dynamics by spinning disk confocal microscopy. Methods Enzymol 2012; 504:293-313. [PMID: 22264541 DOI: 10.1016/b978-0-12-391857-4.00015-x] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The palette of fluorescent proteins (FPs) has grown exponentially over the past decade, and as a result, live imaging of cells expressing fluorescently tagged proteins is becoming more and more mainstream. Spinning disk confocal (SDC) microscopy is a high-speed optical sectioning technique and a method of choice to observe and analyze intracellular FP dynamics at high spatial and temporal resolution. In an SDC system, a rapidly rotating pinhole disk generates thousands of points of light that scan the specimen simultaneously, which allows direct capture of the confocal image with low-noise scientific grade-cooled charge-coupled device cameras, and can achieve frame rates of up to 1000 frames per second. In this chapter, we describe important components of a state-of-the-art spinning disk system optimized for live cell microscopy and provide a rationale for specific design choices. We also give guidelines of how other imaging techniques such as total internal reflection microscopy or spatially controlled photoactivation can be coupled with SDC imaging and provide a short protocol on how to generate cell lines stably expressing fluorescently tagged proteins by lentivirus-mediated transduction.
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Affiliation(s)
- Samantha Stehbens
- Department of Cell & Tissue Biology, University of California, San Francisco, San Francisco, California, USA
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Abstract
Gene therapy vectors based on murine retroviruses have now been in clinical trials for over 20 years. During that time, a variety of novel vector pseudotypes were developed in an effort to improve gene transfer. Lentiviral vectors are now in clinical trials and a similar evolution of vector technology is anticipated. These modifications present challenges for those producing large-scale clinical materials. This chapter discusses approaches to process development for novel lentiviral vectors, highlight considerations, and methods to be incorporated into the development schema.
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Affiliation(s)
- Anna Leath
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Abstract
More than two decades have passed since genetically modified HIV was used for gene delivery. Through continuous improvements these early marker gene-carrying HIVs have evolved into safer and more effective lentiviral vectors. Lentiviral vectors offer several attractive properties as gene-delivery vehicles, including: (i) sustained gene delivery through stable vector integration into host genome; (ii) the capability of infecting both dividing and non-dividing cells; (iii) broad tissue tropisms, including important gene- and cell-therapy-target cell types; (iv) no expression of viral proteins after vector transduction; (v) the ability to deliver complex genetic elements, such as polycistronic or intron-containing sequences; (vi) potentially safer integration site profile; and (vii) a relatively easy system for vector manipulation and production. Accordingly, lentivector technologies now have widespread use in basic biology and translational studies for stable transgene overexpression, persistent gene silencing, immunization, in vivo imaging, generating transgenic animals, induction of pluripotent cells, stem cell modification and lineage tracking, or site-directed gene editing. Moreover, in the present high-throughput '-omics' era, the commercial availability of premade lentiviral vectors, which are engineered to express or silence genome-wide genes, accelerates the rapid expansion of this vector technology. In the present review, we assess the advances in lentiviral vector technology, including basic lentivirology, vector designs for improved efficiency and biosafety, protocols for vector production and infection, targeted gene delivery, advanced lentiviral applications and issues associated with the vector system.
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Wood KC, Konieczkowski DJ, Johannessen CM, Boehm JS, Tamayo P, Botvinnik OB, Mesirov JP, Hahn WC, Root DE, Garraway LA, Sabatini DM. MicroSCALE screening reveals genetic modifiers of therapeutic response in melanoma. Sci Signal 2012; 5:rs4. [PMID: 22589389 DOI: 10.1126/scisignal.2002612] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cell microarrays are a promising tool for performing large-scale functional genomic screening in mammalian cells at reasonable cost, but owing to technical limitations they have been restricted for use with a narrow range of cell lines and short-term assays. Here, we describe MicroSCALE (Microarrays of Spatially Confined Adhesive Lentiviral Features), a cell microarray-based platform that enables application of this technology to a wide range of cell types and longer-term assays. We used MicroSCALE to uncover kinases that when overexpressed partially desensitized B-RAFV600E-mutant melanoma cells to inhibitors of the mitogen-activated protein kinase kinase kinase (MAPKKK) RAF, the MAPKKs MEK1 and 2 (MEK1/2, mitogen-activated protein kinase kinase 1 and 2), mTOR (mammalian target of rapamycin), or PI3K (phosphatidylinositol 3-kinase). These screens indicated that cells treated with inhibitors acting through common mechanisms were affected by a similar profile of overexpressed proteins. In contrast, screens involving inhibitors acting through distinct mechanisms yielded unique profiles, a finding that has potential relevance for small-molecule target identification and combination drugging studies. Further, by integrating large-scale functional screening results with cancer cell line gene expression and pharmacological sensitivity data, we validated the nuclear factor κB pathway as a potential mediator of resistance to MAPK pathway inhibitors. The MicroSCALE platform described here may enable new classes of large-scale, resource-efficient screens that were not previously feasible, including those involving combinations of cell lines, perturbations, and assay outputs or those involving limited numbers of cells and limited or expensive reagents.
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Affiliation(s)
- Kris C Wood
- Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.
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Liu B, Zhao L, Ma H, Zhang W, Jin Y. Knockdown of MRP4 by lentivirus-mediated siRNA improves sensitivity to adriamycin in adriamycin-resistant acute myeloid leukemia cells. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s11434-011-4840-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Abstract
Manufacturing of cell culture-derived virus particles for vaccination and gene therapy is a rapidly growing field in the biopharmaceutical industry. The process involves a number of complex tasks and unit operations ranging from selection of host cells and virus strains for the cultivation in bioreactors to the purification and formulation of the final product. For the majority of cell culture-derived products, efforts focused on maximization of bioreactor yields, whereas design and optimization of downstream processes were often neglected. Owing to this biased focus, downstream procedures today often constitute a bottleneck in various manufacturing processes and account for the majority of the overall production costs. For efficient production methods, particularly in sight of constantly increasing economic pressure within human healthcare systems, highly productive downstream schemes have to be developed. Here, we discuss unit operations and downstream trains to purify virus particles for use as vaccines and vectors for gene therapy.
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Affiliation(s)
- Michael W Wolf
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstrasse 1, 39106 Magdeburg, Germany.
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Ichim CV, Wells RA. Generation of high-titer viral preparations by concentration using successive rounds of ultracentrifugation. J Transl Med 2011; 9:137. [PMID: 21849073 PMCID: PMC3175463 DOI: 10.1186/1479-5876-9-137] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Accepted: 08/17/2011] [Indexed: 11/10/2022] Open
Abstract
Background Viral vectors provide a method of stably introducing exogenous DNA into cells that are not easily transfectable allowing for the ectopic expression or silencing of genes for therapeutic or experimental purposes. However, some cell types, in particular bone marrow cells, dendritic cells and neurons are difficult to transduce with viral vectors. Successful transduction of such cells requires preparation of highly concentrated viral stocks, which permit a high virus concentration and multiplicity of infection (MOI) during transduction. Pseudotyping with the vesicular stomatitis virus G (VSV-G) envelope protein is common practice for both lentiviral and retroviral vectors. The VSV-G glycoprotein adds physical stability to retroviral particles, allowing concentration of virus by high-speed ultracentrifugation. Here we describe a method report for concentration of virus from large volumes of culture supernatant by means of successive rounds of ultracentrifugation into the same ultracentrifuge tube. Method Stable retrovirus producer cell lines were generated and large volumes of virus-containing supernatant were produced. We then tested the transduction ability of virus following varying rounds of concentration by ultra-centrifugation. In a second series of experiments lentivirus-containing supernatant was produced by transient transfection of 297T/17 cells and again we tested the transduction ability of virus following multiple rounds of ultra-centrifugation. Results We report being able to centrifuge VSV-G coated retrovirus for as many as four rounds of ultracentrifugation while observing an additive increase in viral titer. Even after four rounds of ultracentrifugation we did not reach a plateau in viral titer relative to viral supernatant concentrated to indicate that we had reached the maximum tolerated centrifugation time, implying that it may be possible to centrifuge VSV-G coated retrovirus even further should it be necessary to achieve yet higher titers for specific applications. We further report that VSV-G coated lentiviral particles may also be concentrated by successive rounds of ultracentrifugation (in this case four rounds) with minimal loss of transduction efficiency. Conclusion This method of concentrating virus has allowed us to generate virus of sufficient titers to transduce bone marrow cells with both retrovirus and lentivirus, including virus carrying shRNA constructs.
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Affiliation(s)
- Christine V Ichim
- Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 2M9, Canada
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Avery-Kiejda KA, Bowden NA, Croft AJ, Scurr LL, Kairupan CF, Ashton KA, Talseth-Palmer BA, Rizos H, Zhang XD, Scott RJ, Hersey P. P53 in human melanoma fails to regulate target genes associated with apoptosis and the cell cycle and may contribute to proliferation. BMC Cancer 2011; 11:203. [PMID: 21615965 PMCID: PMC3120805 DOI: 10.1186/1471-2407-11-203] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 05/27/2011] [Indexed: 12/29/2022] Open
Abstract
Background Metastatic melanoma represents a major clinical problem. Its incidence continues to rise in western countries and there are currently no curative treatments. While mutation of the P53 tumour suppressor gene is a common feature of many types of cancer, mutational inactivation of P53 in melanoma is uncommon; however, its function often appears abnormal. Methods In this study whole genome bead arrays were used to examine the transcript expression of P53 target genes in extracts from 82 melanoma metastases and 6 melanoma cell lines, to provide a global assessment of aberrant P53 function. The expression of these genes was also examined in extracts derived from diploid human melanocytes and fibroblasts. Results The results indicated that P53 target transcripts involved in apoptosis were under-expressed in melanoma metastases and melanoma cell lines, while those involved in the cell cycle were over-expressed in melanoma cell lines. There was little difference in the transcript expression of P53 target genes between cell lines with null/mutant P53 compared to those with wild-type P53, suggesting that altered expression in melanoma was not related to P53 status. Similarly, down-regulation of P53 by short-hairpin RNA (shRNA) had limited effect on P53 target gene expression in melanoma cells, whereas there were a large number of P53 target genes whose mRNA expression was significantly altered by P53 inhibition in melanocytes. Analysis of whole genome gene expression profiles indicated that the ability of P53 to regulate genes involved in the cell cycle was significantly reduced in melanoma cells. Moreover, inhibition of P53 in melanocytes induced changes in gene expression profiles that were characteristic of melanoma cells and resulted in increased proliferation. Conversely, knockdown of P53 in melanoma cells resulted in decreased proliferation. Conclusions These results indicate that P53 target genes involved in apoptosis and cell cycle regulation are aberrantly expressed in melanoma and that this aberrant functional activity of P53 may contribute to the proliferation of melanoma.
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Affiliation(s)
- Kelly A Avery-Kiejda
- Oncology and Immunology, Calvary Mater Newcastle Hospital, University of Newcastle, Newcastle, NSW, Australia
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Kuroda H, Marino MP, Kutner RH, Reiser J. Production of lentiviral vectors in protein-free media. ACTA ACUST UNITED AC 2011; Chapter 26:Unit 26.8. [PMID: 21400699 DOI: 10.1002/0471143030.cb2608s50] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The use of lentiviral vectors for transgene delivery in vitro and in vivo for applications in neuroscience, hematology, developmental biology, stem cell biology, and transgenesis has become commonplace. Lentiviral vectors provide an attractive tool for transgene delivery in part because of their ability to incorporate (integrate) into the genomic DNA of target cells with high efficiency, especially in cells that are not actively dividing. In addition, lentiviral vector-mediated transgene )expression can be maintained for long periods of time. In this unit, we describe protocols for lentiviral vector production in protein-free media using polyethylenimine (PEI)-mediated transfection, resulting in consistent lentiviral vector stocks. Such stocks are then concentrated by ultracentrifugation. We also provide reliable QPCR protocols to titrate lentiviral vectors based on vector DNA copies present in genomic DNA extracted from transduced cells. The vector production and titration protocol described here can be completed within 8 days.
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Affiliation(s)
- Hitoshi Kuroda
- Gene Therapy Program, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA
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Radulovich N, Leung L, Tsao MS. Modified gateway system for double shRNA expression and Cre/lox based gene expression. BMC Biotechnol 2011; 11:24. [PMID: 21418658 PMCID: PMC3070635 DOI: 10.1186/1472-6750-11-24] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Accepted: 03/22/2011] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The growing need for functional studies of genes has set the stage for the development of versatile tools for genetic manipulations. RESULTS Aiming to provide tools for high throughput analysis of gene functions, we have developed a modified short hairpin RNA (shRNA) and gene expression system based on Gateway Technology. The system contains a series of entry and destination vectors that enables easy transfer of shRNA or cDNA into lentiviral expression systems with a variety of selection or marker genes (i.e. puromycin, hygromycin, green fluorescent protein-EGFP, yellow fluorescent protein-YFP and red fluorescent protein-dsRed2). Our shRNA entry vector pENTR.hU6.hH1 containing two tandem human shRNA expression promoters, H1 and U6, was capable of co-expressing two shRNA sequences simultaneously. The entry vector for gene overexpression, pENTR.CMV.ON was constructed to contain CMV promoter with a multiple cloning site flanked by loxP sites allowing for subsequent Cre/lox recombination. Both shRNA and cDNA expression vectors also contained attL sites necessary for recombination with attR sites in our destination expression vectors. As proof of principle we demonstrate the functionality and efficiency of this system by testing expression of several cDNA and shRNA sequences in a number of cell lines. CONCLUSION Our system is a valuable addition to already existing library of Gateway based vectors and can be an essential tool for many aspects of gene functional studies.
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Affiliation(s)
- Nikolina Radulovich
- University Health Network, Ontario Cancer Institute/Princess Margaret Hospital Site, 610 University Ave., Toronto, Ontario, M5G 2M9, Canada
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Medical Sciences Buildings, 1 King's College Circle, Toronto, Ontario, M5 S 1A8, Canada
| | - Lisa Leung
- University Health Network, Ontario Cancer Institute/Princess Margaret Hospital Site, 610 University Ave., Toronto, Ontario, M5G 2M9, Canada
- Department of Medical Biophysics, University Health Network, Ontario Cancer Institute/Princess Margaret Hospital Site, 610 University Ave., Toronto, Ontario, M5G 2M9, Canada
| | - Ming-Sound Tsao
- University Health Network, Ontario Cancer Institute/Princess Margaret Hospital Site, 610 University Ave., Toronto, Ontario, M5G 2M9, Canada
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Medical Sciences Buildings, 1 King's College Circle, Toronto, Ontario, M5 S 1A8, Canada
- Department of Medical Biophysics, University Health Network, Ontario Cancer Institute/Princess Margaret Hospital Site, 610 University Ave., Toronto, Ontario, M5G 2M9, Canada
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Merten OW, Charrier S, Laroudie N, Fauchille S, Dugué C, Jenny C, Audit M, Zanta-Boussif MA, Chautard H, Radrizzani M, Vallanti G, Naldini L, Noguiez-Hellin P, Galy A. Large-scale manufacture and characterization of a lentiviral vector produced for clinical ex vivo gene therapy application. Hum Gene Ther 2011; 22:343-56. [PMID: 21043787 DOI: 10.1089/hum.2010.060] [Citation(s) in RCA: 135] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
From the perspective of a pilot clinical gene therapy trial for Wiskott-Aldrich syndrome (WAS), we implemented a process to produce a lentiviral vector under good manufacturing practices (GMP). The process is based on the transient transfection of 293T cells in Cell Factory stacks, scaled up to harvest 50 liters of viral stock per batch, followed by purification of the vesicular stomatitis virus glycoprotein-pseudotyped particles through several membrane-based and chromatographic steps. The process leads to a 200-fold volume concentration and an approximately 3-log reduction in protein and DNA contaminants. An average yield of 13% of infectious particles was obtained in six full-scale preparations. The final product contained low levels of contaminants such as simian virus 40 large T antigen or E1A sequences originating from producer cells. Titers as high as 2 × 10(9) infectious particles per milliliter were obtained, generating up to 6 × 10(11) infectious particles per batch. The purified WAS vector was biologically active, efficiently expressing the genetic insert in WAS protein-deficient B cell lines and transducing CD34(+) cells. The vector introduced 0.3-1 vector copy per cell on average in CD34(+) cells when used at the concentration of 10(8) infectious particles per milliliter, which is comparable to preclinical preparations. There was no evidence of cellular toxicity. These results show the implementation of large-scale GMP production, purification, and control of advanced HIV-1-derived lentiviral technology. Results obtained with the WAS vector provide the initial manufacturing and quality control benchmarking that should be helpful to further development and clinical applications.
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Lesch HP, Laitinen A, Peixoto C, Vicente T, Makkonen KE, Laitinen L, Pikkarainen JT, Samaranayake H, Alves PM, Carrondo MJT, Ylä-Herttuala S, Airenne KJ. Production and purification of lentiviral vectors generated in 293T suspension cells with baculoviral vectors. Gene Ther 2011; 18:531-8. [DOI: 10.1038/gt.2010.162] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bowden NA, Ashton KA, Avery-Kiejda KA, Zhang XD, Hersey P, Scott RJ. Nucleotide excision repair gene expression after Cisplatin treatment in melanoma. Cancer Res 2010; 70:7918-26. [PMID: 20807809 DOI: 10.1158/0008-5472.can-10-0161] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Two of the hallmark features of melanoma are its development as a result of chronic UV radiation exposure and the limited efficacy of cisplatin in the disease treatment. Both of these DNA-damaging agents result in large helix-distorting DNA damage that is recognized and repaired by nucleotide excision repair (NER). The aim of this study was to examine the expression of NER gene transcripts, p53, and p21 in melanoma cell lines treated with cisplatin compared with melanocytes. Basal expression of all genes was greater in the melanoma cell lines compared with melanocytes. Global genome repair (GGR) transcripts showed significantly decreased relative expression (RE) in melanoma cell lines 24 hours after cisplatin treatment. The basal RE of p53 was significantly higher in the melanoma cell lines compared with the melanocytes. However, induction of p53 was only significant in the melanocytes at 6 and 24 hours after cisplatin treatment. Inhibition of p53 expression significantly decreased the expression of all the GGR transcripts in melanocytes at 6 and 24 hours after cisplatin treatment. Although the RE levels were lower with p53 inhibition, the induction of the GGR genes was very similar to that in the control melanocytes and increased significantly across the time points. The findings from this study revealed reduced GGR transcript levels in melanoma cells 24 hours after cisplatin treatment. Our findings suggest a possible mechanistic explanation for the limited efficacy of cisplatin treatment and the possible role of UV light in melanoma.
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Affiliation(s)
- Nikola A Bowden
- Centre for Information Based Medicine, University of Newcastle, Newcastle, New South Wales, Australia.
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