1
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Hart KL, Liu B, Brown D, Campo-Fernandez B, Tam K, Orr K, Hollis RP, Brendel C, Williams DA, Kohn DB. A novel high-titer, bifunctional lentiviral vector for autologous hematopoietic stem cell gene therapy of sickle cell disease. Mol Ther Methods Clin Dev 2024; 32:101254. [PMID: 38745893 PMCID: PMC11091523 DOI: 10.1016/j.omtm.2024.101254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Accepted: 04/18/2024] [Indexed: 05/16/2024]
Abstract
A major limitation of gene therapy for sickle cell disease (SCD) is the availability and access to a potentially curative one-time treatment, due to high treatment costs. We have developed a high-titer bifunctional lentiviral vector (LVV) in a vector backbone that has reduced size, high vector yields, and efficient gene transfer to human CD34+ hematopoietic stem and progenitor cells (HSPCs). This LVV contains locus control region cores expressing an anti-sickling βAS3-globin gene and two microRNA-adapted short hairpin RNA simultaneously targeting BCL11A and ZNF410 transcripts to maximally induce fetal hemoglobin (HbF) expression. This LVV induces high levels of anti-sickling hemoglobins (HbAAS3 + HbF), while concurrently decreasing sickle hemoglobin (HbS). The decrease in HbS and increased anti-sickling hemoglobin impedes deoxygenated HbS polymerization and red blood cell sickling at low vector copy per cell in transduced SCD patient CD34+ cells differentiated into erythrocytes. The dual alterations in red cell hemoglobins ameliorated the SCD phenotype in the SCD Berkeley mouse model in vivo. With high titer and enhanced transduction of HSPC at a low multiplicity of infection, this LVV will increase the number of patient doses of vector from production lots to decrease costs and help improve accessibility to gene therapy for SCD.
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Affiliation(s)
- Kevyn L. Hart
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Boya Liu
- Division of Hematology/Oncology, Boston Children’s Hospital, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Devin Brown
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Beatriz Campo-Fernandez
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Kevin Tam
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Katherine Orr
- CSUN-UCLA Stem Cell Scientist Training Program, California State University, Northridge, Northridge, CA 91330, USA
| | - Roger P. Hollis
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Christian Brendel
- Division of Hematology/Oncology, Boston Children’s Hospital, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
- Harvard Stem Cell Institute, Harvard University, Boston, MA 02138, USA
| | - David A. Williams
- Division of Hematology/Oncology, Boston Children’s Hospital, Boston, MA 02115, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
- Harvard Stem Cell Institute, Harvard University, Boston, MA 02138, USA
| | - Donald B. Kohn
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Pediatrics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA 90095, USA
- The Eli & Edythe Broad Center of Regenerative Medicine & Stem Cell Research, University of California, Los Angeles, Los Angeles, CA 90095, USA
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2
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Bauler M, Ferrara F, Lowe B, Beard JA, Wincek C, Wielgosz MM, Park JJ, Shang N, Nandy S, Li C, Langfitt DM, Zhou S, Throm RE. Genetic alteration of SJ293TS cells and modification of serum-free media enhances lentiviral vector production. Mol Ther Methods Clin Dev 2024; 32:101270. [PMID: 38883976 PMCID: PMC11176759 DOI: 10.1016/j.omtm.2024.101270] [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: 01/09/2024] [Accepted: 05/17/2024] [Indexed: 06/18/2024]
Abstract
Successful cell and gene therapy clinical trials have resulted in the US Food and Drug Administration and European Medicines Agency approving their use for treatment of patients with certain types of cancers and monogenetic diseases. These novel therapies, which rely heavily on lentiviral vectors to deliver therapeutic transgenes to patient cells, have driven additional investigations, increasing demand for both pre-clinical and current Good Manufacturing Practices-grade viral vectors. To better support novel studies by improving current production methods, we report the development of a genetically modified HEK293T-based cell line that is null for expression of both Protein Kinase R and Beta-2 microglobulin and grows in suspension using serum-free media, SJ293TS-DPB. Absence of Protein Kinase R increased anti-sense lentiviral vector titers by more than 7-fold, while absence of Beta-2 microglobulin, a key component of major histocompatibility complex class I molecules, has been reported to reduce the immunogenicity of lentiviral particles. Furthermore, we describe an improved methodology for culturing SJ293TS-DPB that facilitates expansion, reduces handling, and increases titers by 2-fold compared with previous methods. SJ293TS-DPB stably produced lentiviral vectors for over 4 months and generated lentiviral vectors that efficiently transduce healthy human donor T cells and CD34+ hematopoietic stem cells.
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Affiliation(s)
- Matthew Bauler
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Francesca Ferrara
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Brandon Lowe
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jordan A Beard
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Chris Wincek
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Matthew M Wielgosz
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jeoungeun J Park
- Experimental Cell Therapeutics Lab, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Na Shang
- Experimental Cell Therapeutics Lab, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Saikat Nandy
- Biostatistics, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Cai Li
- Biostatistics, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Deanna M Langfitt
- Bone Marrow Transplant and Cell Therapy, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Sheng Zhou
- Experimental Cell Therapeutics Lab, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Robert E Throm
- Vector Development and Production Laboratory, St Jude Children's Research Hospital, Memphis, TN 38105, USA
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3
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Iaffaldano BJ, Marino MP, Reiser J. CRISPR library screening to develop HEK293-derived cell lines with improved lentiviral vector titers. Front Genome Ed 2023; 5:1218328. [PMID: 37520398 PMCID: PMC10373892 DOI: 10.3389/fgeed.2023.1218328] [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: 05/07/2023] [Accepted: 07/03/2023] [Indexed: 08/01/2023] Open
Abstract
Lentiviral (LV) vectors have emerged as powerful tools for treating genetic and acquired human diseases. As clinical studies and commercial demands have progressed, there has been a growing need for large amounts of purified LV vectors. To help meet this demand, we developed CRISPR library screening methods to identify genetic perturbations in human embryonic kidney 293 (HEK293) cells and their derivatives that may increase LV vector titers. Briefly, LV vector-based Human CRISPR Activation and Knockout libraries (Calabrese and Brunello) were used to modify HEK293 and HEK293T cells. These cell populations were then expanded, and integrated LV vector genomes were rescued by transfection. LV vectors were harvested, and the process of sequential transduction and rescue-transfection was iterated. Through this workflow, guide RNAs (gRNAs) that target genes that may suppress or enhance LV vector production were enriched and identified with Next-Generation Sequencing (NGS). Though more work is needed to test genes identified in this screen, we expect that perturbations of genes we identified here, such as TTLL12, which is an inhibitor of antiviral innate immunity may be introduced and multiplexed to yield cell lines with improved LV vector productivity.
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4
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Fereydouni M, Ahani E, Desai P, Motaghed M, Dellinger A, Metcalfe DD, Yin Y, Lee SH, Kafri T, Bhatt AP, Dellinger K, Kepley CL. Human Tumor Targeted Cytotoxic Mast Cells for Cancer Immunotherapy. Front Oncol 2022; 12:871390. [PMID: 35574362 PMCID: PMC9097604 DOI: 10.3389/fonc.2022.871390] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 03/23/2022] [Indexed: 12/14/2022] Open
Abstract
The diversity of autologous cells being used and investigated for cancer therapy continues to increase. Mast cells (MCs) are tissue cells that contain a unique set of anti-cancer mediators and are found in and around tumors. We sought to exploit the anti-tumor mediators in MC granules to selectively target them to tumor cells using tumor specific immunoglobin E (IgE) and controllably trigger release of anti-tumor mediators upon tumor cell engagement. We used a human HER2/neu-specific IgE to arm human MCs through the high affinity IgE receptor (FcεRI). The ability of MCs to bind to and induce apoptosis of HER2/neu-positive cancer cells in vitro and in vivo was assessed. The interactions between MCs and cancer cells were investigated in real time using confocal microscopy. The mechanism of action using cytotoxic MCs was examined using gene array profiling. Genetically manipulating autologous MC to assess the effects of MC-specific mediators have on apoptosis of tumor cells was developed using siRNA. We found that HER2/neu tumor-specific IgE-sensitized MCs bound, penetrated, and killed HER2/neu-positive tumor masses in vitro. Tunneling nanotubes formed between MCs and tumor cells are described that parallel tumor cell apoptosis. In solid tumor, human breast cancer (BC) xenograft mouse models, infusion of HER2/neu IgE-sensitized human MCs co-localized to BC cells, decreased tumor burden, and prolonged overall survival without indications of toxicity. Gene microarray of tumor cells suggests a dependence on TNF and TGFβ signaling pathways leading to apoptosis. Knocking down MC-released tryptase did not affect apoptosis of cancer cells. These studies suggest MCs can be polarized from Type I hypersensitivity-mediating cells to cytotoxic cells that selectively target tumor cells and specifically triggered to release anti-tumor mediators. A strategy to investigate which MC mediators are responsible for the observed tumor killing is described so that rational decisions can be made in the future when selecting which mediators to target for deletion or those that could further polarize them to cytotoxic MC by adding other known anti-tumor agents. Using autologous human MC may provide further options for cancer therapeutics that offers a unique anti-cancer mechanism of action using tumor targeted IgE’s.
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Affiliation(s)
- Mohammad Fereydouni
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, NC, United States
| | - Elnaz Ahani
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina Agricultural and Technical (AT) State University, Greensboro, NC, United States
| | - Parth Desai
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, NC, United States
| | - Mona Motaghed
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina Agricultural and Technical (AT) State University, Greensboro, NC, United States
| | - Anthony Dellinger
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, NC, United States
| | - Dean D. Metcalfe
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Yuzhi Yin
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Sung Hyun Lee
- Gene Therapy Center and Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Tal Kafri
- Gene Therapy Center and Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Aadra P. Bhatt
- Lineberger Comprehensive Cancer Center, and the Center for Gastrointestinal Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Kristen Dellinger
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina Agricultural and Technical (AT) State University, Greensboro, NC, United States
| | - Christopher L. Kepley
- Department of Molecular and Cellular Sciences, Liberty University College of Osteopathic Medicine, Lynchburg, VA, United States
- *Correspondence: Christopher L. Kepley,
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5
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Han J, Tam K, Tam C, Hollis RP, Kohn DB. Improved lentiviral vector titers from a multi-gene knockout packaging line. Mol Ther Oncolytics 2021; 23:582-592. [PMID: 34938858 PMCID: PMC8660686 DOI: 10.1016/j.omto.2021.11.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 11/18/2021] [Indexed: 01/01/2023] Open
Abstract
Lentiviral vectors (LVs) are robust delivery vehicles for gene therapy as they can efficiently integrate transgenes into host cell genomes. However, LVs with lengthy or complex expression cassettes typically are produced at low titers and have reduced gene transfer capacity, creating barriers for clinical and commercial applications. Modifications of the packaging cell line and methods may be able to produce complex vectors at higher titer and infectivity and may improve production of many different LVs. In this study, we identified two host restriction factors in HEK293T packaging cells that impeded LV production, 2'-5'-oligoadenylate synthetase 1 (OAS1) and low-density lipoprotein receptor (LDLR). Knocking out these two genes separately led to ∼2-fold increases in viral titer. We created a monoclonal cell line, CRISPRed HEK293T to Disrupt Antiviral Response (CHEDAR), by successively knocking out OAS1, LDLR, and PKR, a previously identified factor impeding LV titers. Packaging in CHEDAR yielded ∼7-fold increases in physical particles, full-length vector RNA, and vector titers. In addition, overexpressing transcription elongation factors, SPT4 and SPT5, during packaging improved the production of full-length vector RNA, thereby increasing titers by ∼2-fold. Packaging in CHEDAR with over-expression of SPT4 and SPT5 led to ∼11-fold increases of titers. These approaches improved the production of a variety of LVs, especially vectors with low titers or with internal promoters in the reverse orientation, and may be beneficial for multiple gene therapy applications.
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Affiliation(s)
- Jiaying Han
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Kevin Tam
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095, USA
| | - Curtis Tam
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095, USA
| | - Roger P. Hollis
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Donald B. Kohn
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
- Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
- The Eli & Edythe Broad Center of Regenerative Medicine & Stem Cell Research, University of California, Los Angeles, CA 90095, USA
- UCLA Jonsson Comprehensive Cancer Center, Los Angeles, CA 90095, USA
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6
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Bona R, Michelini Z, Mazzei C, Gallinaro A, Canitano A, Borghi M, Vescio MF, Di Virgilio A, Pirillo MF, Klotman ME, Negri D, Cara A. Safety and efficiency modifications of SIV-based integrase-defective lentiviral vectors for immunization. Mol Ther Methods Clin Dev 2021; 23:263-275. [PMID: 34729374 PMCID: PMC8526422 DOI: 10.1016/j.omtm.2021.09.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 09/24/2021] [Indexed: 11/20/2022]
Abstract
Integrase-defective lentiviral vectors (IDLVs) represent an attractive platform for vaccine development as a result of the ability to induce persistent humoral- and cellular-mediated immune responses against the encoded transgene. Compared with the parental integrating vector, the main advantages for using IDLV are the reduced hazard of insertional mutagenesis and the decreased risk for vector mobilization by wild-type viruses. Here we report on the development and use in the mouse immunogenicity model of simian immunodeficiency virus (SIV)-based IDLV containing a long deletion in the U3 region and with the 3' polypurine tract (PPT) removed from the transfer vector for improving safety and/or efficacy. Results show that a safer extended deletion of U3 sequences did not modify integrase-mediated or -independent integration efficiency. Interestingly, 3' PPT deletion impaired integrase-mediated integration but did not reduce illegitimate, integrase-independent integration efficiency, contrary to what was previously reported in the HIV system. Importantly, although the extended deletion in the U3 did not affect expression or immunogenicity from IDLV, deletion of 3' PPT considerably reduced both expression and immunogenicity of IDLV.
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Affiliation(s)
- Roberta Bona
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Zuleika Michelini
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Chiara Mazzei
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Alessandra Gallinaro
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Andrea Canitano
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Martina Borghi
- Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - Maria Fenicia Vescio
- Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - Antonio Di Virgilio
- Center for Animal Research and Welfare, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - Maria Franca Pirillo
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Mary E. Klotman
- Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA
| | - Donatella Negri
- Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - Andrea Cara
- National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
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7
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Han J, Tam K, Ma F, Tam C, Aleshe B, Wang X, Quintos JP, Morselli M, Pellegrini M, Hollis RP, Kohn DB. β-Globin Lentiviral Vectors Have Reduced Titers due to Incomplete Vector RNA Genomes and Lowered Virion Production. Stem Cell Reports 2020; 16:198-211. [PMID: 33186538 PMCID: PMC7897704 DOI: 10.1016/j.stemcr.2020.10.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 10/15/2020] [Accepted: 10/16/2020] [Indexed: 12/29/2022] Open
Abstract
Lentiviral vectors (LVs) commonly used for the treatment of hemoglobinopathies often have low titers and sub-optimal gene transfer efficiency for human hematopoietic stem and progenitor cells (HSPCs), hindering clinical translation and commercialization for ex vivo gene therapy. We observed that a high percentage of β-globin LV viral genomic RNAs were incomplete toward the 3′ end in packaging cells and in released vector particles. The incomplete vector genomes impeded reverse transcription in target cells, limiting stable gene transfer to HSPCs. By combining three modifications to vector design and production (shortening the vector length to 5.3 kb; expressing HIV-1 Tat protein during packaging; and packaging in PKR−/− cells) there was a 30-fold increase in vector titer and a 3-fold increase in vector infectivity in HSPCs. These approaches may improve the manufacturing of β-globin and other complex LVs for enhanced gene delivery and may facilitate clinical applications. Vector genomes are truncated in a length-dependent manner during packaging Truncated RNAs cannot be reverse transcribed, impeding titer and infectivity Protein kinase R inhibits virion formation for bidirectional lentiviral vectors Three strategies to improve lentiviral vector titer by 30× and infectivity by 3×
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Affiliation(s)
- Jiaying Han
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Terasaki Life Sciences Building, 610 Charles E. Young Drive East, Los Angeles, CA 90095-1489, USA
| | - Kevin Tam
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, USA
| | - Feiyang Ma
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, USA
| | - Curtis Tam
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, USA
| | - Bamidele Aleshe
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Xiaoyan Wang
- Department of General Internal Medicine and Health Services Research, UCLA, Los Angeles, CA, USA
| | - Jason P Quintos
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Marco Morselli
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, USA
| | - Matteo Pellegrini
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, USA
| | - Roger P Hollis
- Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Donald B Kohn
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Terasaki Life Sciences Building, 610 Charles E. Young Drive East, Los Angeles, CA 90095-1489, USA; Department of Microbiology, Immunology & Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, USA; Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, USA; The Eli & Edythe Broad Center of Regenerative Medicine & Stem Cell Research, University of California, Los Angeles, USA; UCLA Jonsson Comprehensive Cancer Center, Los Angeles, USA.
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8
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Luis A. The Old and the New: Prospects for Non-Integrating Lentiviral Vector Technology. Viruses 2020; 12:v12101103. [PMID: 33003492 PMCID: PMC7600637 DOI: 10.3390/v12101103] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/27/2020] [Accepted: 09/28/2020] [Indexed: 02/07/2023] Open
Abstract
Lentiviral vectors have been developed and used in multiple gene and cell therapy applications. One of their main advantages over other vectors is the ability to integrate the genetic material into the genome of the host. However, this can also be a disadvantage as it may lead to insertional mutagenesis. To address this, non-integrating lentiviral vectors (NILVs) were developed. To generate NILVs, it is possible to introduce mutations in the viral enzyme integrase and/or mutations on the viral DNA recognised by integrase (the attachment sites). NILVs are able to stably express transgenes from episomal DNA in non-dividing cells or transiently if the target cells divide. It has been shown that these vectors are able to transduce multiple cell types and tissues. These characteristics make NILVs ideal vectors to use in vaccination and immunotherapies, among other applications. They also open future prospects for NILVs as tools for the delivery of CRISPR/Cas9 components, a recent revolutionary technology now widely used for gene editing and repair.
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Affiliation(s)
- Apolonia Luis
- Department of Infectious Diseases, School of Immunology and Microbial Sciences, King's College London, London SE1 9RT, UK
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9
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Han Z, He J, Zou M, Chen W, Lv Y, Li Y. Small interfering RNA target for long noncoding RNA PCGEM1 increases the sensitivity of LNCaP cells to baicalein. Anat Rec (Hoboken) 2020; 303:2077-2085. [PMID: 32445497 DOI: 10.1002/ar.24454] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 03/13/2020] [Accepted: 03/26/2020] [Indexed: 12/16/2022]
Abstract
The objective of this study is to investigate the inhibitory effect and mechanism of long noncoding RNA PCGEM1 siRNA combined with baicalein on prostate cancer LNCaP cells. LNCaP cells transfected with small hairpin RNA lentiviral vector targeting PCGEM1 were constructed and their expression in LNCaP cells was absent. The stable cell line of LNCaP cells infected with LV3-shRNA-PCGEM1 was successfully constructed. In addition, LV3-shRNA-PCGEM1 was able to increase the baicalein-induced inhibitory effects on LNCaP cells, and the susceptibility was 2.3 fold higher than that of baicalein alone. LV3-shRNA-PCGEM1 combined with baicalein also inhibited the colony formation, increased G2 and S phase cells, inhibited the expression of PCGEM1, and induced autophagy of LNCaP cells. In summary, LV3-shRNA-PCGEM1 may improve the sensitivity of LNCaP cells to baicalein, and the molecular mechanism may be associated with the decrease of PCGEM1 expression and the induction of autophagy. Our findings provided an experimental basis for the combined treatment of Chinese traditional and Western medicine on prostate cancer in a clinical setting.
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Affiliation(s)
- Zeping Han
- Department of Laboratory Medicine, Central Hospital of Panyu District, Guangzhou, Guangdong, People's Republic of China
| | - Jinhua He
- Department of Laboratory Medicine, Central Hospital of Panyu District, Guangzhou, Guangdong, People's Republic of China
| | - Maoxian Zou
- Department of Laboratory Medicine, Central Hospital of Panyu District, Guangzhou, Guangdong, People's Republic of China
| | - Weiming Chen
- Department of Laboratory Medicine, Central Hospital of Panyu District, Guangzhou, Guangdong, People's Republic of China
| | - Yubing Lv
- Department of Laboratory Medicine, Central Hospital of Panyu District, Guangzhou, Guangdong, People's Republic of China
| | - Yuguang Li
- Department of Laboratory Medicine, Central Hospital of Panyu District, Guangzhou, Guangdong, People's Republic of China
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