1
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Wang XY, Zhang X, Wang TY, Jia YL, Xu DH, Yi DD. Shortened nuclear matrix attachment regions are sufficient for replication and maintenance of episomes in mammalian cells. Mol Biol Cell 2019; 30:2761-2770. [PMID: 31509492 PMCID: PMC6789156 DOI: 10.1091/mbc.e19-02-0108] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Matrix attachment regions (MARs) can mediate the replication of vector episomes in mammalian cells; however, the molecular mode of action remains unclear. Here, we assessed the characteristics of MARs and the mechanism that mediates episomal vector replication in mammalian cells. Five shortened subfragments of β-interferon MAR fragments were cloned and transferred into CHO cells, and transgene expression levels, presence of the gene, and the episomal maintenance mechanism were determined. Three shortened MAR derivatives (position 781–1320, 1201–1740, and 1621–2201) retained full MAR activity and mediated episomal vector replication. Moreover, the three shortened MARs showed higher transgene expression levels, greater efficiency in colony formation, and more persistent transgene expression compared with those of the original pEPI-1 plasmid, and three functional truncated MARs can bind to SAF-A MAR-binding protein. These results suggest that shortened MARs are sufficient for replication and maintenance of episomes in CHO cells.
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Affiliation(s)
- Xiao-Yin Wang
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Xinxiang 453003, Henan, China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Xinxiang 453003, Henan, China
| | - Xi Zhang
- International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Xinxiang 453003, Henan, China
| | - Tian-Yun Wang
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Xinxiang 453003, Henan, China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Xinxiang 453003, Henan, China
| | - Yan-Long Jia
- Pharmacy Collage, Xinxiang Medical University, Xinxiang 453003, Henan, China
| | - Dan-Hua Xu
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Xinxiang 453003, Henan, China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Xinxiang 453003, Henan, China
| | - Dan-Dan Yi
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Xinxiang 453003, Henan, China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Xinxiang 453003, Henan, China
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2
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Stavrou M, Philip B, Traynor-White C, Davis CG, Onuoha S, Cordoba S, Thomas S, Pule M. A Rapamycin-Activated Caspase 9-Based Suicide Gene. Mol Ther 2018; 26:1266-1276. [PMID: 29661681 PMCID: PMC5993966 DOI: 10.1016/j.ymthe.2018.03.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 02/26/2018] [Accepted: 03/03/2018] [Indexed: 01/20/2023] Open
Abstract
Engineered T cell therapies show considerable promise in the treatment of refractory malignancies. Given the ability of engineered T cells to engraft and persist for prolonged periods along with unpredicted toxicities, incorporation of a suicide gene to allow selective depletion after administration is desirable. Rapamycin is a safe and widely available immunosuppressive pharmaceutical that acts by heterodimerization of FKBP12 with the FRB fragment of mTOR. The apical caspase caspase 9 is activated by homodimerization through its CARD domain. We developed a rapamycin-induced caspase 9 suicide gene. First, we showed that caspase 9 could be activated by a two-protein format with replacement of the CARD domain with both FRB and FKBP12. We next identified an optimal compact single-protein rapamycin caspase 9 (rapaCasp9) by fusing both FRB and FKBP12 with the catalytic domain of caspase 9. Functionality of rapaCasp9 when co-expressed with a CD19 CAR was demonstrated in vitro and in vivo.
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Affiliation(s)
| | - Brian Philip
- Cancer Institute, University College London, London, UK
| | | | | | | | | | - Simon Thomas
- Autolus Ltd., Forest House, White City, London, UK
| | - Martin Pule
- Autolus Ltd., Forest House, White City, London, UK; Cancer Institute, University College London, London, UK.
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3
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Thomas S, Straathof K, Himoudi N, Anderson J, Pule M. An Optimized GD2-Targeting Retroviral Cassette for More Potent and Safer Cellular Therapy of Neuroblastoma and Other Cancers. PLoS One 2016; 11:e0152196. [PMID: 27030986 PMCID: PMC4816271 DOI: 10.1371/journal.pone.0152196] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 03/10/2016] [Indexed: 01/22/2023] Open
Abstract
Neuroblastoma is the commonest extra cranial solid cancer of childhood. Despite escalation of treatment regimens, a significant minority of patients die of their disease. Disialoganglioside (GD2) is consistently expressed at high-levels in neuroblastoma tumors, which have been targeted with some success using therapeutic monoclonal antibodies. GD2 is also expressed in a range of other cancer but with the exception of some peripheral nerves is largely absent from non-transformed tissues. Chimeric Antigen Receptors (CARs) are artificial type I proteins which graft the specificity of a monoclonal antibody onto a T-cell. Clinical data with early CAR designs directed against GD2 have shown some promise in Neuroblastoma. Here, we describe a GD2-targeting CAR retroviral cassette, which has been optimized for CAR T-cell persistence, efficacy and safety.
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Affiliation(s)
- Simon Thomas
- Cancer Institute, University College London, London, United Kingdom
| | - Karin Straathof
- Institute of Child Health, University College London, London, United Kingdom
| | - Nourredine Himoudi
- Institute of Child Health, University College London, London, United Kingdom
| | - John Anderson
- Institute of Child Health, University College London, London, United Kingdom
| | - Martin Pule
- Cancer Institute, University College London, London, United Kingdom
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4
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Khamaikawin W, Saoin S, Nangola S, Chupradit K, Sakkhachornphop S, Hadpech S, Onlamoon N, Ansari AA, Byrareddy SN, Boulanger P, Hong SS, Torbett BE, Tayapiwatana C. Combined Antiviral Therapy Using Designed Molecular Scaffolds Targeting Two Distinct Viral Functions, HIV-1 Genome Integration and Capsid Assembly. MOLECULAR THERAPY-NUCLEIC ACIDS 2015; 4:e249. [PMID: 26305555 PMCID: PMC4560793 DOI: 10.1038/mtna.2015.22] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 07/14/2015] [Indexed: 01/06/2023]
Abstract
Designed molecular scaffolds have been proposed as alternative therapeutic agents against HIV-1. The ankyrin repeat protein (Ank(GAG)1D4) and the zinc finger protein (2LTRZFP) have recently been characterized as intracellular antivirals, but these molecules, used individually, do not completely block HIV-1 replication and propagation. The capsid-binder Ank(GAG)1D4, which inhibits HIV-1 assembly, does not prevent the genome integration of newly incoming viruses. 2LTRZFP, designed to target the 2-LTR-circle junction of HIV-1 cDNA and block HIV-1 integration, would have no antiviral effect on HIV-1-infected cells. However, simultaneous expression of these two molecules should combine the advantage of preventive and curative treatments. To test this hypothesis, the genes encoding the N-myristoylated Myr(+)Ank(GAG)1D4 protein and the 2LTRZFP were introduced into human T-cells, using a third-generation lentiviral vector. SupT1 cells stably expressing 2LTRZFP alone or with Myr(+)Ank(GAG)1D4 showed a complete resistance to HIV-1 in viral challenge. Administration of the Myr(+)Ank(GAG)1D4 vector to HIV-1-preinfected SupT1 cells resulted in a significant antiviral effect. Resistance to viral infection was also observed in primary human CD4+ T-cells stably expressing Myr(+)Ank(GAG)1D4, and challenged with HIV-1, SIVmac, or SHIV. Our data suggest that our two anti-HIV-1 molecular scaffold prototypes are promising antiviral agents for anti-HIV-1 gene therapy.
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Affiliation(s)
- Wannisa Khamaikawin
- Division of Clinical Immunology, Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand.,Center of Biomolecular Therapy and Diagnostic, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
| | - Somphot Saoin
- Division of Clinical Immunology, Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand.,Center of Biomolecular Therapy and Diagnostic, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
| | - Sawitree Nangola
- Division of Clinical Immunology and Transfusion Sciences, School of Allied Health Sciences, University of Phayao, Phayao, Thailand
| | - Koollawat Chupradit
- Division of Clinical Immunology, Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand.,Center of Biomolecular Therapy and Diagnostic, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
| | | | - Sudarat Hadpech
- Division of Clinical Immunology, Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand.,Center of Biomolecular Therapy and Diagnostic, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
| | - Nattawat Onlamoon
- Division of Instruments for Research, Office for Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Aftab A Ansari
- Department of Pathology & Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Siddappa N Byrareddy
- Department of Pathology & Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Pierre Boulanger
- University Lyon 1 & INRA UMR-754, Retrovirus and Comparative Pathology, Lyon, France
| | - Saw-See Hong
- University Lyon 1 & INRA UMR-754, Retrovirus and Comparative Pathology, Lyon, France
| | - Bruce E Torbett
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California, USA
| | - Chatchai Tayapiwatana
- Division of Clinical Immunology, Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand.,Center of Biomolecular Therapy and Diagnostic, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
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5
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Hagedorn C, Lipps HJ, Rupprecht S. The epigenetic regulation of autonomous replicons. Biomol Concepts 2015; 1:17-30. [PMID: 25961982 DOI: 10.1515/bmc.2010.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The discovery of autonomous replicating sequences (ARSs) in Saccharomyces cerevisiae in 1979 was considered a milestone in unraveling the regulation of replication in eukaryotic cells. However, shortly afterwards it became obvious that in Saccharomyces pombe and all other higher organisms ARSs were not sufficient to initiate independent replication. Understanding the mechanisms of replication is a major challenge in modern cell biology and is also a prerequisite to developing application-oriented autonomous replicons for gene therapeutic treatments. This review will focus on the development of non-viral episomal vectors, their use in gene therapeutic applications and our current knowledge about their epigenetic regulation.
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6
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Verghese SC, Goloviznina NA, Skinner AM, Lipps HJ, Kurre P. S/MAR sequence confers long-term mitotic stability on non-integrating lentiviral vector episomes without selection. Nucleic Acids Res 2014; 42:e53. [PMID: 24474068 PMCID: PMC3985655 DOI: 10.1093/nar/gku082] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 12/27/2013] [Accepted: 01/06/2014] [Indexed: 01/11/2023] Open
Abstract
Insertional oncogene activation and aberrant splicing have proved to be major setbacks for retroviral stem cell gene therapy. Integrase-deficient human immunodeficiency virus-1-derived vectors provide a potentially safer approach, but their circular genomes are rapidly lost during cell division. Here we describe a novel lentiviral vector (LV) that incorporates human ß-interferon scaffold/matrix-associated region sequences to provide an origin of replication for long-term mitotic maintenance of the episomal LTR circles. The resulting 'anchoring' non-integrating lentiviral vector (aniLV) achieved initial transduction rates comparable with integrating vector followed by progressive establishment of long-term episomal expression in a subset of cells. Analysis of aniLV-transduced single cell-derived clones maintained without selective pressure for >100 rounds of cell division showed sustained transgene expression from episomes and provided molecular evidence for long-term episome maintenance. To evaluate aniLV performance in primary cells, we transduced lineage-depleted murine hematopoietic progenitor cells, observing GFP expression in clonogenic progenitor colonies and peripheral blood leukocyte chimerism following transplantation into conditioned hosts. In aggregate, our studies suggest that scaffold/matrix-associated region elements can serve as molecular anchors for non-integrating lentivector episomes, providing sustained gene expression through successive rounds of cell division and progenitor differentiation in vitro and in vivo.
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Affiliation(s)
- Santhosh Chakkaramakkil Verghese
- Department of Pediatrics, Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA, Department of Surgery/Surgical Oncology, Oregon Health & Science University, Portland, OR 97239, USA, Center for Biomedical Education and Research, Institute of Cell Biology, University of Witten/Herdecke, Witten 58453, Germany, Oregon Stem Cell Center, Oregon Health & Science University, Portland, OR 97239, USA and Department of Cell & Developmental Biology Oregon Health & Science University, Portland, OR 97239, USA
| | - Natalya A. Goloviznina
- Department of Pediatrics, Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA, Department of Surgery/Surgical Oncology, Oregon Health & Science University, Portland, OR 97239, USA, Center for Biomedical Education and Research, Institute of Cell Biology, University of Witten/Herdecke, Witten 58453, Germany, Oregon Stem Cell Center, Oregon Health & Science University, Portland, OR 97239, USA and Department of Cell & Developmental Biology Oregon Health & Science University, Portland, OR 97239, USA
| | - Amy M. Skinner
- Department of Pediatrics, Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA, Department of Surgery/Surgical Oncology, Oregon Health & Science University, Portland, OR 97239, USA, Center for Biomedical Education and Research, Institute of Cell Biology, University of Witten/Herdecke, Witten 58453, Germany, Oregon Stem Cell Center, Oregon Health & Science University, Portland, OR 97239, USA and Department of Cell & Developmental Biology Oregon Health & Science University, Portland, OR 97239, USA
| | - Hans J. Lipps
- Department of Pediatrics, Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA, Department of Surgery/Surgical Oncology, Oregon Health & Science University, Portland, OR 97239, USA, Center for Biomedical Education and Research, Institute of Cell Biology, University of Witten/Herdecke, Witten 58453, Germany, Oregon Stem Cell Center, Oregon Health & Science University, Portland, OR 97239, USA and Department of Cell & Developmental Biology Oregon Health & Science University, Portland, OR 97239, USA
| | - Peter Kurre
- Department of Pediatrics, Papé Family Pediatric Research Institute, Oregon Health & Science University, Portland, OR 97239, USA, Department of Surgery/Surgical Oncology, Oregon Health & Science University, Portland, OR 97239, USA, Center for Biomedical Education and Research, Institute of Cell Biology, University of Witten/Herdecke, Witten 58453, Germany, Oregon Stem Cell Center, Oregon Health & Science University, Portland, OR 97239, USA and Department of Cell & Developmental Biology Oregon Health & Science University, Portland, OR 97239, USA
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7
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Festa M, Brun P, Piccinini R, Castagliuolo I, Basso B, Zecconi A. Staphylococcus aureus Efb protein expression in Nicotiana tabacum and immune response to oral administration. Res Vet Sci 2013; 94:484-9. [PMID: 23158852 DOI: 10.1016/j.rvsc.2012.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 10/16/2012] [Accepted: 10/20/2012] [Indexed: 10/27/2022]
Abstract
Staphylococcus aureus (S. aureus) is one of the most widespread agent of diseases in humans and animals. In dairy cows, S. aureus is the most frequently isolated contagious pathogens in mastitis cases and vaccines are one of the potential tools to control the infections, thus decreasing the use of antibiotics. Among all the virulence factors produced by S. aureus, extra cellular fibrinogen binding protein (Efb) is an important one in the pathogenesis of mastitis. Plants are useful bioreactors to produce antigens and the aim of the study was the production of Efb in two cultivars of Nicotiana tabacum as a mean to produce vaccine against S. aureus in plants. A matrix attachment region (MAR) sequence was inserted near the two borders of transfer-DNA in the transformation vector in the two possible orientations. The presence of MAR elements in the transformation system significantly improved transformation efficiency and Efb protein yield up to a 2% level on total soluble protein (TSP). Mice orally immunized with transgenic lyophilized leaves produced an antigen-specific immune response.
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Affiliation(s)
- Margherita Festa
- Institute of Biophysics CNR-Dept. Life Sciences, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
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8
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Watts KL, Zhang X, Beard BC, Chiu SY, Trobridge GD, Humphries RK, Kiem HP. Differential effects of HOXB4 and NUP98-HOXA10hd on hematopoietic repopulating cells in a nonhuman primate model. Hum Gene Ther 2011; 22:1475-82. [PMID: 21787196 DOI: 10.1089/hum.2011.100] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Expansion of hematopoietic stem cells (HSCs) is beneficial in settings where HSC numbers are limited, such as cord blood transplantation. The human homeobox transcription factor HOXB4 has been shown to enhance stem cell expansion in several experimental models. We have shown previously that HOXB4 overexpression in monkey CD34(+) cells has a dramatic effect on expansion and engraftment of short-term repopulating cells. Here, we wished to compare the effects of HOXB4 and another candidate gene, NUP98-HOXA10hd (NA10hd). We used a competitive repopulation assay in pigtailed macaques to study engraftment of CD34(+) cells modified with gammaretroviral HOXB4YFP or NA10hdGFP. We found that HOXB4YFP contributed more to early hematopoiesis (<30 days), whereas NA10hdGFP contributed more to later hematopoiesis. In each case, we observed two distinct peaks in engraftment of NA10hd-transduced cells, one within 20 days post transplant and another after 5-6 months. Analysis of CD14(+), CD3(+), and CD20(+) subsets confirmed that higher percentages of cells of each lineage were derived from NA10hdGFP(+) progenitors than from HOXB4YFP(+) progenitors. In conclusion, we show that HOXB4 and NA10hd both have a significant impact on hematopoietic reconstitution; however, these effects are differential and therefore may offer complementary strategies for HSC expansion.
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9
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Yi Y, Noh MJ, Lee KH. Current advances in retroviral gene therapy. Curr Gene Ther 2011; 11:218-28. [PMID: 21453283 PMCID: PMC3182074 DOI: 10.2174/156652311795684740] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Accepted: 03/15/2011] [Indexed: 12/25/2022]
Abstract
There have been major changes since the incidents of leukemia development in X-SCID patients after the treatments using retroviral gene therapy. Due to the risk of oncogenesis caused by retroviral insertional activation of host genes, most of the efforts focused on the lentiviral therapies. However, a relative clonal dominance was detected in a patient with β-thalassemia Major, two years after the subject received genetically modified hematopoietic stem cells using lentiviral vectors. This disappointing result of the recent clinical trial using lentiviral vector tells us that the current and most advanced vector systems does not have enough safety. In this review, various safety features that have been tried for the retroviral gene therapy are introduced and the possible new ways of improvements are discussed. Additional feature of chromatin insulators, co-transduction of a suicidal gene under the control of an inducible promoter, conditional expression of the transgene only in appropriate target cells, targeted transduction, cell type-specific expression, targeted local administration, splitting of the viral genome, and site specific insertion of retroviral vector are discussed here.
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10
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Moreno R, Martínez I, Petriz J, Nadal M, Tintoré X, Gonzalez JR, Gratacós E, Aran JM. The β-Interferon Scaffold Attachment Region Confers High-Level Transgene Expression and Avoids Extinction by Epigenetic Modifications of Integrated Provirus in Adipose Tissue-Derived Human Mesenchymal Stem Cells. Tissue Eng Part C Methods 2011; 17:275-87. [DOI: 10.1089/ten.tec.2010.0383] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Rafael Moreno
- Medical and Molecular Genetics Center, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), Barcelona, Spain
| | - Itziar Martínez
- Medical and Molecular Genetics Center, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), Barcelona, Spain
| | - Jordi Petriz
- Biomedical Research Unit, Institut de Recerca Hospital Universitari Vall d'Hebron, Barcelona, Spain
| | - Marga Nadal
- Translational Research Laboratory, IDIBELL-Institut Català d'Oncologia, Barcelona, Spain
| | - Xavier Tintoré
- Plastic Surgery Service, Capio Hospital General de Catalunya, Barcelona, Spain
| | - Juan Ramón Gonzalez
- Center for Research in Environmental Epidemiology (CREAL) and CIBERESP, Barcelona, Spain
| | - Eduard Gratacós
- Maternal-Fetal Medicine Department, Hospital Clinic-IDIBAPS, University of Barcelona and CIBERER, Barcelona, Spain
| | - Josep M. Aran
- Medical and Molecular Genetics Center, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), Barcelona, Spain
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11
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Clark JD, Billington K, Bumstead JM, Oakes RD, Soon PE, Sopp P, Tomley FM, Blake DP. A toolbox facilitating stable transfection of Eimeria species. Mol Biochem Parasitol 2008; 162:77-86. [DOI: 10.1016/j.molbiopara.2008.07.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Revised: 07/17/2008] [Accepted: 07/22/2008] [Indexed: 11/30/2022]
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12
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Beard BC, Dickerson D, Beebe K, Gooch C, Fletcher J, Okbinoglu T, Miller DG, Jacobs MA, Kaul R, Kiem HP, Trobridge GD. Comparison of HIV-derived Lentiviral and MLV-based Gammaretroviral Vector Integration Sites in Primate Repopulating Cells. Mol Ther 2007; 15:1356-65. [PMID: 17440443 DOI: 10.1038/sj.mt.6300159] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The potential for leukemia caused by retroviral vector integration has become a significant concern for hematopoietic stem cell gene therapy. We analyzed the distribution of vector integrants in pigtailed macaque and baboon repopulating cells for the two most commonly used retroviral vector systems, human immunodeficiency virus (HIV)-based lentiviral vectors and murine leukemia virus (MLV)-based gammaretroviral vectors, to help define their relative genotoxicity. All animals had polyclonal engraftment with no apparent adverse effects from transplantation with gene-modified cells. In all, 380 MLV and 235 HIV unique vector integration sites were analyzed and had distinct distribution patterns in relation to genes and CpG islands as observed in previous in vitro studies. Both vector types were found more frequently in and near proto-oncogenes in repopulating cells than in a random dataset. Analysis of functional classes of genes with integrants within 100 kilobases (kb) of their transcription start sites showed an over-representation of genes involved in growth or survival near both lentiviral and gammaretroviral integrants. Microarray analysis showed that both gammaretroviral and lentiviral vectors were found close to genes with high expression levels in primitive cells enriched for hematopoietic stem cells. These data help define the relative risk of insertional mutagenesis with MLV-, HIV-, and simian immunodeficiency virus (SIV)-based vectors in a highly relevant primate model.
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Affiliation(s)
- Brian C Beard
- Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
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13
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Shepherd BE, Kiem HP, Lansdorp PM, Dunbar CE, Aubert G, LaRochelle A, Seggewiss R, Guttorp P, Abkowitz JL. Hematopoietic stem-cell behavior in nonhuman primates. Blood 2007; 110:1806-13. [PMID: 17526860 PMCID: PMC1976353 DOI: 10.1182/blood-2007-02-075382] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Little is known about the behavior of hematopoietic stem cells (HSCs) in primates because direct observations and competitive-repopulation assays are not feasible. Therefore, we used 2 different and independent experimental strategies, the tracking of transgene expression after retroviral-mediated gene transfer (N = 11 baboons; N = 7 rhesus macaques) and quantitation of the average telomere length of granulocytes (N = 132 baboons; N = 14 macaques), together with stochastic methods, to study HSC kinetics in vivo. The average replication rate for baboon HSCs is once per 36 weeks according to gene-marking analyses and once per 23 weeks according to telomere-shortening analyses. Comparable results were derived from the macaque data. These rates are substantially slower than the average replication rates previously reported for HSCs in mice (once per 2.5 weeks) and cats (once per 8.3 weeks). Because baboons and macaques live for 25 to 45 years, much longer than mice ( approximately 2 years) and cats (12-18 years), we can compute that HSCs undergo a relatively constant number ( approximately 80-200) of lifetime replications. Thus, our data suggest that the self-renewal capacity of mammalian stem cells in vivo is defined and evolutionarily conserved.
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Affiliation(s)
- Bryan E Shepherd
- Department of Biostatistics, Vanderbilt University, Nashville, TN, USA
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14
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Chang AH, Sadelain M. The Genetic Engineering of Hematopoietic Stem Cells: the Rise of Lentiviral Vectors, the Conundrum of the LTR, and the Promise of Lineage-restricted Vectors. Mol Ther 2007; 15:445-56. [PMID: 17228317 DOI: 10.1038/sj.mt.6300060] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Recent studies on the integration patterns of different categories of retroviral vectors, the genotoxicity of long-terminal repeats (LTRs) and other genetic elements, the rise of lentiviral technology and the emergence of regulated vector systems providing tissue-restricted transgene expression and RNA interference, are profoundly changing the landscape of stem cell-based therapies. New developments in vector design and an increasing understanding of the mechanisms underlying insertional oncogenesis are ushering in a new phase in hematopoietic stem cell (HSC) engineering, thus bringing the hitherto exclusive reliance on LTR-driven, gamma-retroviral vectors to an end. Based on their ability to transduce non-dividing cells and their genomic stability, lentiviral vectors offer new prospects for the manipulation of HSCs. Tissue-specific vectors, as exemplified by globin vectors, not only provide therapeutic efficacy, but may also enhance safety, insofar that they restrict transgene expression in stem cells, progenitor cells and blood cells in all but the transcriptionally targeted lineage. This review provides a survey of these advances as well as several remaining challenges, focusing in particular on the importance of achieving adequate levels of protein expression from a limited number of vector copies per cell-ideally one to two.
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Affiliation(s)
- Alex H Chang
- Laboratory of Gene Transfer and Gene Expression, Memorial Sloan-Kettering Cancer Center, New York, New York, USA
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15
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Swan CH, Bühler B, Steinberger P, Tschan MP, Barbas CF, Torbett BE. T-cell protection and enrichment through lentiviral CCR5 intrabody gene delivery. Gene Ther 2006; 13:1480-92. [PMID: 16738691 DOI: 10.1038/sj.gt.3302801] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
CCR5 is the chemokine co-receptor for R5-tropic human immunodeficiency virus type 1 (HIV-1) isolates most often associated with primary infection. We have developed an HIV-1 self-inactivating vector, CAD-R5, containing a CCR5 single-chain antibody (intrabody) gene, which when expressed in T-cell lines and primary CD4+ T cells disrupts CCR5 cell surface expression and provides protection from R5-tropic isolate exposure. Furthermore, CAD-R5 intrabody expression in primary CD4+ T cells supports significant growth and enrichment over time during HIV-1-pulsed dendritic cell-T-cell interactions. These results indicate that CCR5 intrabody-expressing CD4+ T cells are refractory against this highly efficient primary route of infection. CD34+ cells transduced with the CAD-R5 vector gave rise to CD4+ and CD8+ thymocytes in non-obese diabetic (NOD)/ severely combined-immunodeficient (SCID)-human thymus/liver (hu thy/liv) mice, suggesting that CCR5 intrabody expression can be maintained throughout differentiation without obvious cellular effects. CD4+ T cells isolated from NOD/SCID-hu thy/liv mice were resistant to R5-tropic HIV-1 challenge demonstrating the maintenance of protection. Our findings demonstrate delivery of anti-HIV-1 activity through CCR5 intrabodies in primary CD4+ T cells and CD34+ cell-derived T-cell progeny. Thus, gene delivery strategies that provide a selective survival and growth advantage for T effector cells may provide a therapeutic benefit for HIV-1-infected individuals who have failed conventional therapies.
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Affiliation(s)
- C H Swan
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
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16
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Zhang XB, Beard BC, Beebe K, Storer B, Humphries RK, Kiem HP. Differential effects of HOXB4 on nonhuman primate short- and long-term repopulating cells. PLoS Med 2006; 3:e173. [PMID: 16637742 PMCID: PMC1450018 DOI: 10.1371/journal.pmed.0030173] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2005] [Accepted: 02/10/2006] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Hematopoietic stem cells (HSCs) or repopulating cells are able to self-renew and differentiate into cells of all hematopoietic lineages, and they can be enriched using the CD34 cell surface marker. Because of this unique property, HSCs have been used for HSC transplantation and gene therapy applications. However, the inability to expand HSCs has been a significant limitation for clinical applications. Here we examine, in a clinically relevant nonhuman primate model, the ability of HOXB4 to expand HSCs to potentially overcome this limitation. METHODS AND FINDINGS Using a competitive repopulation assay, we directly compared in six animals engraftment of HOXB4GFP (HOXB4 green fluorescent protein) and control (yellow fluorescent protein [YFP])-transduced and expanded CD34+ cells. In three animals, cells were infused after a 3-d transduction culture, while in three other animals cells were infused after an additional 6-9 d of ex vivo expansion. We demonstrate that HOXB4 overexpression resulted in superior engraftment in all animals. The most dramatic effect of HOXB4 was observed early after transplantation, resulting in an up to 56-fold higher engraftment compared to the control cells. At 6 mo after transplantation, the proportion of marker gene-expressing cells in peripheral blood was still up to 5-fold higher for HOXB4GFP compared to YFP-transduced cells. CONCLUSIONS These data demonstrate that HOXB4 overexpression in CD34+ cells has a dramatic effect on expansion and engraftment of short-term repopulating cells and a significant, but less pronounced, effect on long-term repopulating cells. These data should have important implications for the expansion and transplantation of HSCs, in particular for cord blood transplantations where often only suboptimal numbers of HSCs are available.
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Affiliation(s)
- Xiao-Bing Zhang
- 1Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Brian C Beard
- 1Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Katherine Beebe
- 1Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Barry Storer
- 1Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- 2Department of Biostatistics, University of Washington, Seattle, Washington, United States of America
| | - R. Keith Humphries
- 3Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia, Canada
- 4Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Hans-Peter Kiem
- 1Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- 5Departments of Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
- * To whom correspondence should be addressed. E-mail:
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Abstract
Retrovirus vectors integrate into the genome, providing stable gene transfer, but integration contributes in part to transcriptional silencing that compromises long-term expression. In the case of gammaretrovirus vectors based on murine leukemia virus, many integration events are completely silenced in undifferentiated stem cells and in transgenic mice. Gammaretrovirus vectors are also subject to variegation in which sister cells bearing the same provirus differentially express, and cell differentiation can lead to extinction of vector expression. In contrast, lentivirus vectors based on human immunodeficiency virus type 1 appear to express more efficiently, although other reports indicate that lentivirus vectors can be silenced. This review summarizes the key features of gammaretrovirus vector silencing. The evidence for and against gene silencing of lentivirus vectors is described with special emphasis on the potential effects of vector design, provirus copy number, and integration site preferences on silencing. This analysis suggests that the difference between selfinactivating (SIN) lentivirus vectors and their modified SIN gammaretrovirus counterparts may be less dramatic than previously thought. It will therefore be important to further characterize the mechanisms of silencing, in order to create better gammaretrovirus and lentivirus vectors that consistently express at single copy for gene therapy.
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Affiliation(s)
- James Ellis
- Developmental Biology Program, Hospital for Sick Children, Toronto, ON, Canada M5G 1L7.
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18
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Bode J, Winkelmann S, Götze S, Spiker S, Tsutsui K, Bi C, A K P, Benham C. Correlations between scaffold/matrix attachment region (S/MAR) binding activity and DNA duplex destabilization energy. J Mol Biol 2005; 358:597-613. [PMID: 16516920 DOI: 10.1016/j.jmb.2005.11.073] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2005] [Revised: 11/02/2005] [Accepted: 11/04/2005] [Indexed: 10/25/2022]
Abstract
Scaffold or matrix-attachment regions (S/MARs) are thought to be involved in the organization of eukaryotic chromosomes and in the regulation of several DNA functions. Their characteristics are conserved between plants and humans, and a variety of biological activities have been associated with them. The identification of S/MARs within genomic sequences has proved to be unexpectedly difficult, as they do not appear to have consensus sequences or sequence motifs associated with them. We have shown that S/MARs do share a characteristic structural property, they have a markedly high predicted propensity to undergo strand separation when placed under negative superhelical tension. This result agrees with experimental observations, that S/MARs contain base-unpairing regions (BURs). Here, we perform a quantitative evaluation of the association between the ease of stress-induced DNA duplex destabilization (SIDD) and S/MAR binding activity. We first use synthetic oligomers to investigate how the arrangement of localized unpairing elements within a base-unpairing region affects S/MAR binding. The organizational properties found in this way are applied to the investigation of correlations between specific measures of stress-induced duplex destabilization and the binding properties of naturally occurring S/MARs. For this purpose, we analyze S/MAR and non-S/MAR elements that have been derived from the human genome or from the tobacco genome. We find that S/MARs exhibit long regions of extensive destabilization. Moreover, quantitative measures of the SIDD attributes of these fragments calculated under uniform conditions are found to correlate very highly (r2>0.8) with their experimentally measured S/MAR-binding strengths. These results suggest that duplex destabilization may be involved in the mechanisms by which S/MARs function. They suggest also that SIDD properties may be incorporated into an improved computational strategy to search genomic DNA sequences for sites having the necessary attributes to function as S/MARs, and even to estimate their relative binding strengths.
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Affiliation(s)
- Jürgen Bode
- German Research Center for Biotechnology, RDIF/Epigenetic Regulation, D-38124 Braunschweig, Mascheroder Weg 1, Germany.
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Horn PA, Morris JC, Neff T, Kiem HP. Stem cell gene transfer--efficacy and safety in large animal studies. Mol Ther 2005; 10:417-31. [PMID: 15336643 DOI: 10.1016/j.ymthe.2004.05.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2004] [Accepted: 05/10/2004] [Indexed: 10/26/2022] Open
Affiliation(s)
- Peter A Horn
- Clinical Research Division, Fred Hutchinson Cancer Research Center, University of Washington, Seattle, WA, 98109, USA
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20
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Ellis J. Silencing and Variegation of Gammaretrovirus and Lentivirus Vectors. Hum Gene Ther 2005. [DOI: 10.1089/hum.2005.16.ft-126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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21
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Johnson CN, Levy LS. Matrix attachment regions as targets for retroviral integration. Virol J 2005; 2:68. [PMID: 16111492 PMCID: PMC1198263 DOI: 10.1186/1743-422x-2-68] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2005] [Accepted: 08/19/2005] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The randomness of retroviral integration has been debated for many years. Recent evidence indicates that integration site selection is not random, and that it is influenced by both viral and cellular factors. To study the role of DNA structure in site selection, retroviral integration near matrix attachment regions (MARs) was analyzed for three different groups of retroviruses. The objective was to assess whether integration near MARs may be a factor for integration site selection. RESULTS Results indicated that MLV, SL3-3 MuLV, HIV-1 and HTLV-1 integrate preferentially near MARs, specifically within 2-kilobases (kb). In addition, a preferential position and orientation relative to the adjacent MAR was observed for each virus. Further analysis of SL3-3 MuLV insertions in common integration sites (CISs) demonstrated a higher frequency of integration near MARs and an orientation preference that was not observed for integrations outside CISs. CONCLUSION These findings contribute to a growing body of evidence indicating that retroviral integration is not random, that MARs influence integration site selection for some retroviruses, and that integration near MARs may have a role in the insertional activation of oncogenes by gammaretroviruses.
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Affiliation(s)
- Chassidy N Johnson
- Department of Microbiology & Immunology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, Louisiana, 70112, USA
| | - Laura S Levy
- Department of Microbiology & Immunology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, Louisiana, 70112, USA
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Keyser KA, Morris JC, Kiem HP. Genetically modified CD34+ cells do not contribute to the mesenchymal compartment after autologous transplantation in the baboon. Cytotherapy 2005; 7:345-52. [PMID: 16162456 DOI: 10.1080/14653240500238244] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND There is ongoing controversy about the transdifferentiation of hematopoietic stem cells (HSC) into different tissues such as mesenchymal cells. This transdifferentiation or 'plasticity' would be an appealing concept for many therapeutic strategies. While studies in the murine model show encouraging results, reports from clinical allogeneic stem cell transplantations do not support the concept of HSC plasticity. Our aim was to determine whether transplantation of transduced autologous marrow CD34+ cells leads to long-term engraftment of gene-marked cells with mesenchymal characteristics in the baboon. METHODS We analyzed marrow of two baboons that had received green fluorescence protein (GFP)-marked CD34+ autologous marrow cells after myeloablative conditioning. Marrow was obtained 1 and 2.5 years after transplantation and adherent CD11a- (pan-leukocyte Ab) cells were cultured for 3 weeks. Cultures were then analyzed by flow cytometry and fluorescence microscopy for the presence of GFP+ cells. For further analysis fresh and cultured cells were also labeled with multiple Ab and functional analysis was performed. RESULTS Both animals showed persistent and stable GFP marking by flow cytometry in peripheral blood leukocytes as well as in CD34+ marrow cells at 1 and 2.5 years after transplantation. There was no evidence of GFP+ mesenchymal cells by either flow cytometry or fluorescence microscopy, while functional and phenotypical analysis identified mesenchymal stem cells in these cultures. DISCUSSION We conclude that genetically modified CD34+ cells do not contribute to the adherent marrow-derived mesenchymal cell population after autologous transplantation.
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Affiliation(s)
- K A Keyser
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109-1024, USA
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Hanawa H, Hematti P, Keyvanfar K, Metzger ME, Krouse A, Donahue RE, Kepes S, Gray J, Dunbar CE, Persons DA, Nienhuis AW. Efficient gene transfer into rhesus repopulating hematopoietic stem cells using a simian immunodeficiency virus-based lentiviral vector system. Blood 2004; 103:4062-9. [PMID: 14976042 DOI: 10.1182/blood-2004-01-0045] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
High-titer, HIV-1-based lentiviral vector particles were found to transduce cytokine-mobilized rhesus macaque CD34(+) cells and clonogenic progenitors very poorly (< 1%), reflecting the postentry restriction in rhesus cells to HIV infection. To overcome this barrier, we developed a simian immunodeficiency virus (SIV)-based vector system. A single exposure to a low concentration of amphotropic pseudotyped SIV vector particles encoding the green fluorescent protein (GFP) resulted in gene transfer into 68% +/- 1% of rhesus bulk CD34(+) cells and 75% +/- 1% of clonogenic progenitors. Polymerase chain reaction (PCR) analysis of DNA from individual hematopoietic colonies confirmed these relative transduction efficiencies. To evaluate SIV vector-mediated stem cell gene transfer in vivo, 3 rhesus macaques underwent transplantation with transduced, autologous cytokine-mobilized peripheral blood CD34(+) cells following myeloablative conditioning. Hematopoietic reconstitution was rapid, and an average of 18% +/- 8% and 15% +/- 7% GFP-positive granulocytes and monocytes, respectively, were observed 4 to 6 months after transplantation, consistent with the average vector copy number of 0.19 +/- 0.05 in peripheral blood leukocytes as determined by real-time PCR. Vector insertion site analysis demonstrated polyclonal reconstitution with vector-containing cells. SIV vectors appear promising for evaluating gene therapy approaches in nonhuman primate models.
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Affiliation(s)
- Hideki Hanawa
- Experimental Hematology Division, Department of Hematology/Oncology, St Jude Children's Research Hospital, 332 N Lauderdale, Memphis, TN 38105, USA
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