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Kolster M, Sonntag A, Weise C, Correa J, Fuchs H, Walther W, Fernandez-Megia E, Weng A. Broadening the Scope of Sapofection: Cationic Peptide-Saponin Conjugates Improve Gene Delivery In Vitro and In Vivo. ACS APPLIED MATERIALS & INTERFACES 2024; 16:36095-36105. [PMID: 38970470 PMCID: PMC11261559 DOI: 10.1021/acsami.4c05846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 06/07/2024] [Accepted: 06/25/2024] [Indexed: 07/08/2024]
Abstract
Gene therapies represent promising new therapeutic options for a variety of indications. However, despite several approved drugs, its potential remains untapped. For polymeric gene delivery, endosomal escape represents a bottleneck. SO1861, a naturally occurring triterpene saponin with endosomal escape properties isolated from Saponaria officinalis L., has been described as additive agent to enhance transfection efficiency (sapofection). However, the challenge to synchronize the saponin and gene delivery system in vivo imposes limitations. Herein, we address this issue by conjugating SO1861 to a peptide-based gene vector using a pH-sensitive hydrazone linker programmed to release SO1861 at the acidic pH of the endosome. Nanoplexes formulated with SO1861-equipped peptides were investigated for transfection efficiency and tolerability in vitro and in vivo. In all investigated cell lines, SO1861-conjugated nanoplexes have shown superior transfection efficiency and cell viability over supplementation of transfection medium with free SO1861. Targeted SO1861-equipped nanoplexes incorporating a targeting peptide were tested in vitro and in vivo in an aggressively growing neuroblastoma allograft model in mice. Using a suicide gene vector encoding the cytotoxic protein saporin, a slowed tumor growth and improved survival rate were observed for targeted SO1861-equipped nanoplexes compared to vehicle control.
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Affiliation(s)
- Meike Kolster
- Institut
für Pharmazie, Freie Universität
Berlin, Königin-Luise-Straße 2-4, Berlin 14195, Germany
| | - Alexander Sonntag
- Institut
für Pharmazie, Freie Universität
Berlin, Königin-Luise-Straße 2-4, Berlin 14195, Germany
| | - Christoph Weise
- Institut
für Chemie und Biochemie, Freie Universität
Berlin, Thielallee 63, Berlin 14195, Germany
| | - Juan Correa
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Jenaro de la Fuente s/n, Santiago de Compostela 15782, Spain
| | - Hendrik Fuchs
- Institut
für Laboratoriumsmedizin, Klinische Chemie und Pathobiochemie, Charité − Universitätsmedizin
Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität
zu Berlin, Augustenburger Platz 1, Berlin 13353, Germany
| | - Wolfgang Walther
- Experimental
Pharmacology & Oncology Berlin-Buch GmbH, Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Eduardo Fernandez-Megia
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Jenaro de la Fuente s/n, Santiago de Compostela 15782, Spain
| | - Alexander Weng
- Institut
für Pharmazie, Freie Universität
Berlin, Königin-Luise-Straße 2-4, Berlin 14195, Germany
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2
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Bacchetti F, Schito AM, Milanese M, Castellaro S, Alfei S. Anti Gram-Positive Bacteria Activity of Synthetic Quaternary Ammonium Lipid and Its Precursor Phosphonium Salt. Int J Mol Sci 2024; 25:2761. [PMID: 38474008 DOI: 10.3390/ijms25052761] [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: 02/01/2024] [Revised: 02/21/2024] [Accepted: 02/25/2024] [Indexed: 03/14/2024] Open
Abstract
Organic ammonium and phosphonium salts exert excellent antimicrobial effects by interacting lethally with bacterial membranes. Particularly, quaternary ammonium lipids have demonstrated efficiency both as gene vectors and antibacterial agents. Here, aiming at finding new antibacterial devices belonging to both classes, we prepared a water-soluble quaternary ammonium lipid (6) and a phosphonium salt (1) by designing a synthetic path where 1 would be an intermediate to achieve 6. All synthesized compounds were characterized by Fourier-transform infrared spectroscopy and Nuclear Magnetic Resonance. Additionally, potentiometric titrations of NH3+ groups 1 and 6 were performed to further confirm their structure by determining their experimental molecular weight. The antibacterial activities of 1 and 6 were assessed first against a selection of multi-drug-resistant clinical isolates of both Gram-positive and Gram-negative species, observing remarkable antibacterial activity of both compounds against Gram-positive isolates of Enterococcus and Staphylococcus genus. Further investigations on a wider variety of strains of these species confirmed the remarkable antibacterial effects of 1 and 6 (MICs = 4-16 and 4-64 µg/mL, respectively), while 24 h-time-killing experiments carried out with 1 on different S. aureus isolates evidenced a bacteriostatic behavior. Moreover, both compounds 1 and 6, at the lower MIC concentration, did not show significant cytotoxic effects when exposed to HepG2 human hepatic cell lines, paving the way for their potential clinical application.
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Affiliation(s)
| | - Anna Maria Schito
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, 16132 Genoa, Italy
| | - Marco Milanese
- Department of Pharmacy, University of Genoa, 16148 Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Sara Castellaro
- Department of Pharmacy, University of Genoa, 16148 Genoa, Italy
| | - Silvana Alfei
- Department of Pharmacy, University of Genoa, 16148 Genoa, Italy
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Sanghani A, Kafetzis KN, Sato Y, Elboraie S, Fajardo-Sanchez J, Harashima H, Tagalakis AD, Yu-Wai-Man C. Novel PEGylated Lipid Nanoparticles Have a High Encapsulation Efficiency and Effectively Deliver MRTF-B siRNA in Conjunctival Fibroblasts. Pharmaceutics 2021; 13:382. [PMID: 33805660 PMCID: PMC7998417 DOI: 10.3390/pharmaceutics13030382] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 03/07/2021] [Accepted: 03/09/2021] [Indexed: 01/07/2023] Open
Abstract
The master regulator of the fibrosis cascade is the myocardin-related transcription factor/serum response factor (MRTF/SRF) pathway, making it a key target for anti-fibrotic therapeutics. In the past, inhibitors and small interfering RNAs (siRNAs) targeting the MRTF-B gene have been deployed to counter fibrosis in the eye, with the latter showing promising results. However, the biggest challenge in implementing siRNA therapeutics is the method of delivery. In this study, we utilised the novel, pH-sensitive, cationic lipid CL4H6, which has previously demonstrated potent targeting of hepatocytes and endosomal escape, to safely and efficiently deliver an MRTF-B siRNA into human conjunctival fibroblasts. We prepared two lipid nanoparticle (LNP) formulations, incorporating targeting cleavable peptide cY in one of them, and measured their physicochemical properties and silencing effect in human conjunctival fibroblasts. Both proved to be non-cytotoxic at a concentration of 50 nM and effectively silenced the MRTF-B gene in vitro, with the targeting cleavable peptide not affecting the silencing efficiency [LNP with cY: 62.1% and 81.5% versus LNP without cY: 77.7% and 80.2%, at siRNA concentrations of 50 nM (p = 0.06) and 100 nM (p = 0.09), respectively]. On the other hand, the addition of the targeting cleavable peptide significantly increased the encapsulation efficiency of the LNPs from 92.5% to 99.3% (p = 0.0005). In a 3D fibroblast-populated collagen matrix model, both LNP formulations significantly decreased fibroblast contraction after a single transfection. We conclude that the novel PEGylated CL4H6-MRTF-B siRNA-loaded LNPs represent a promising therapeutic approach to prevent conjunctival fibrosis after glaucoma filtration surgery.
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Affiliation(s)
- Amisha Sanghani
- Faculty of Life Sciences & Medicine, King’s College London, London SE1 7EH, UK; (A.S.); (J.F.-S.)
- Department of Ophthalmology, St Thomas’ Hospital, London SE1 7EH, UK
| | | | - Yusuke Sato
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan; (Y.S.); (H.H.)
| | - Salsabil Elboraie
- Department of Biology, Edge Hill University, Ormskirk L39 4QP, UK; (K.N.K.); (S.E.)
| | - Julia Fajardo-Sanchez
- Faculty of Life Sciences & Medicine, King’s College London, London SE1 7EH, UK; (A.S.); (J.F.-S.)
- Department of Ophthalmology, St Thomas’ Hospital, London SE1 7EH, UK
| | - Hideyoshi Harashima
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan; (Y.S.); (H.H.)
| | | | - Cynthia Yu-Wai-Man
- Faculty of Life Sciences & Medicine, King’s College London, London SE1 7EH, UK; (A.S.); (J.F.-S.)
- Department of Ophthalmology, St Thomas’ Hospital, London SE1 7EH, UK
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4
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Arta A, Larsen JB, Eriksen AZ, Kempen PJ, Larsen M, Andresen TL, Urquhart AJ. Cell targeting strategy affects the intracellular trafficking of liposomes altering loaded doxorubicin release kinetics and efficacy in endothelial cells. Int J Pharm 2020; 588:119715. [PMID: 32750439 DOI: 10.1016/j.ijpharm.2020.119715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 07/20/2020] [Accepted: 07/28/2020] [Indexed: 11/30/2022]
Abstract
Targeting nanocarrier drug delivery systems, that deliver drug payloads to the site of disease action, are frequently viewed as the future of nanocarrier based therapies but have struggled to breakthrough to the clinic in comparison to non-targeting counterparts. Using unilamellar liposomes as model nanocarriers, we show that cell targeting strategy (electrostatic, ligand and antigen) influences both the intracellular fate of the liposomes and the corresponding efficacy of the loaded drug, doxorubicin, in endothelial cells. We show that increased liposome uptake by cells does not translate to improved efficacy in this scenario but that liposome intracellular trafficking, particularly distribution between recycling endosomes and lysosomes, influences in vitro efficacy. Choosing targeting strategies that promote desired nanocarrier intracellular trafficking may be a viable strategy to enhance the in vivo efficacy of drug delivery systems.
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Affiliation(s)
- Anthoula Arta
- Department of Health Technology, Technical University of Denmark, Building 345C, 2800 Kgs. Lyngby, Denmark
| | - Jannik B Larsen
- Department of Health Technology, Technical University of Denmark, Building 345C, 2800 Kgs. Lyngby, Denmark
| | - Anne Z Eriksen
- Department of Health Technology, Technical University of Denmark, Building 345C, 2800 Kgs. Lyngby, Denmark
| | - Paul J Kempen
- Department of Health Technology, Technical University of Denmark, Building 345C, 2800 Kgs. Lyngby, Denmark
| | - Michael Larsen
- Department of Opthalmology, Rigshospitalet, Glostrup, Denmark; Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas L Andresen
- Department of Health Technology, Technical University of Denmark, Building 345C, 2800 Kgs. Lyngby, Denmark
| | - Andrew J Urquhart
- Department of Health Technology, Technical University of Denmark, Building 345C, 2800 Kgs. Lyngby, Denmark.
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5
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Fernando O, Tagalakis AD, Awwad S, Brocchini S, Khaw PT, Hart SL, Yu-Wai-Man C. Development of Targeted siRNA Nanocomplexes to Prevent Fibrosis in Experimental Glaucoma Filtration Surgery. Mol Ther 2018; 26:2812-2822. [PMID: 30301666 PMCID: PMC6277485 DOI: 10.1016/j.ymthe.2018.09.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 09/01/2018] [Accepted: 09/05/2018] [Indexed: 11/28/2022] Open
Abstract
RNAi induced by double-stranded small interfering RNA (siRNA) molecules has attracted great attention as a naturally occurring approach to silence gene expression with high specificity. The myocardin-related transcription factor/serum response factor (MRTF/SRF) pathway is a master regulator of cytoskeletal gene expression and, thus, represents a promising target to prevent fibrosis. A major hurdle to implementing siRNA therapies is the method of delivery, and we have, thus, optimized lipid-peptide-siRNA (LPR) nanoparticles containing MRTF-B siRNAs as a targeted approach to prevent conjunctival fibrosis. We tested 15 LPR nanoparticle formulations with different lipid compositions, surface charges, and targeting or non-targeting peptides in human conjunctival fibroblasts. In vitro, the LPR formulation of the DOTMA/DOPE lipid with the targeting peptide Y (LYR) was the most efficient in MRTF-B gene silencing and non-cytotoxic compared to the non-targeting formulation. In vivo, subconjunctival administration of LYR nanoparticles containing MRTF-B siRNAs doubled bleb survival in a pre-clinical rabbit model of glaucoma filtration surgery. Furthermore, MRTF-B LYR nanoparticles reduced the MRTF-B mRNA by 29.6% in rabbit conjunctival tissues, which led to significantly decreased conjunctival scarring with no adverse side effects. LYR-mediated delivery of siRNA shows promising results to increase bleb survival and to prevent conjunctival fibrosis after glaucoma filtration surgery.
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Affiliation(s)
- Owen Fernando
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London EC1V 2PD, UK
| | - Aristides D Tagalakis
- Experimental and Personalised Medicine Section, Genetics and Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, London WC1N 1EH, UK; Department of Biology, Edge Hill University, Ormskirk L39 4QP, UK
| | - Sahar Awwad
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London EC1V 2PD, UK; UCL School of Pharmacy, London WC1N 1AX, UK
| | - Steve Brocchini
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London EC1V 2PD, UK; UCL School of Pharmacy, London WC1N 1AX, UK
| | - Peng T Khaw
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London EC1V 2PD, UK
| | - Stephen L Hart
- Experimental and Personalised Medicine Section, Genetics and Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, London WC1N 1EH, UK
| | - Cynthia Yu-Wai-Man
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London EC1V 2PD, UK; King's College London, London SE1 7EH, UK.
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6
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Delivery of ENaC siRNA to epithelial cells mediated by a targeted nanocomplex: a therapeutic strategy for cystic fibrosis. Sci Rep 2017; 7:700. [PMID: 28386087 PMCID: PMC5428798 DOI: 10.1038/s41598-017-00662-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 03/07/2017] [Indexed: 12/15/2022] Open
Abstract
The inhibition of ENaC may have therapeutic potential in CF airways by reducing sodium hyperabsorption, restoring lung epithelial surface fluid levels, airway hydration and mucociliary function. The challenge has been to deliver siRNA to the lung with sufficient efficacy for a sustained therapeutic effect. We have developed a self-assembling nanocomplex formulation for siRNA delivery to the airways that consists of a liposome (DOTMA/DOPE; L), an epithelial targeting peptide (P) and siRNA (R). LPR formulations were assessed for their ability to silence expression of the transcript of the gene encoding the α-subunit of the sodium channel ENaC in cell lines and primary epithelial cells, in submerged cultures or grown in air-liquid interface conditions. LPRs, containing 50 nM or 100 nM siRNA, showed high levels of silencing, particularly in primary airway epithelial cells. When nebulised these nanocomplexes still retained their biophysical properties and transfection efficiencies. The silencing ability was determined at protein level by confocal microscopy and western blotting. In vivo data demonstrated that these nanoparticles had the ability to silence expression of the α-ENaC subunit gene. In conclusion, these findings show that LPRs can modulate the activity of ENaC and this approach might be promising as co-adjuvant therapy for cystic fibrosis.
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7
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Rezaee M, Oskuee RK, Nassirli H, Malaekeh-Nikouei B. Progress in the development of lipopolyplexes as efficient non-viral gene delivery systems. J Control Release 2016; 236:1-14. [DOI: 10.1016/j.jconrel.2016.06.023] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 06/12/2016] [Accepted: 06/13/2016] [Indexed: 01/05/2023]
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8
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Yu-Wai-Man C, Tagalakis AD, Manunta MD, Hart SL, Khaw PT. Receptor-targeted liposome-peptide-siRNA nanoparticles represent an efficient delivery system for MRTF silencing in conjunctival fibrosis. Sci Rep 2016; 6:21881. [PMID: 26905457 PMCID: PMC4764806 DOI: 10.1038/srep21881] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 02/03/2016] [Indexed: 12/22/2022] Open
Abstract
There is increasing evidence that the Myocardin-related transcription factor/Serum response factor (MRTF/SRF) pathway plays a key role in fibroblast activation and that knocking down MRTF can lead to reduced scarring and fibrosis. Here, we have developed a receptor-targeted liposome-peptide-siRNA nanoparticle as a non-viral delivery system for MRTF-B siRNA in conjunctival fibrosis. Using 50 nM siRNA, the MRTF-B gene was efficiently silenced by 76% and 72% with LYR and LER nanoparticles, respectively. The silencing efficiency was low when non-targeting peptides or siRNA alone or liposome-siRNA alone were used. LYR and LER nanoparticles also showed higher silencing efficiency than PEGylated LYR-P and LER-P nanoparticles. The nanoparticles were not cytotoxic using different liposomes, targeting peptides, and 50 nM siRNA. Three-dimensional fibroblast-populated collagen matrices were also used as a functional assay to measure contraction in vitro, and showed that MRTF-B LYR nanoparticles completely blocked matrix contraction after a single transfection treatment. In conclusion, this is the first study to develop and show that receptor-targeted liposome-peptide-siRNA nanoparticles represent an efficient and safe non-viral siRNA delivery system that could be used to prevent fibrosis after glaucoma filtration surgery and other contractile scarring conditions in the eye.
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Affiliation(s)
- Cynthia Yu-Wai-Man
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, United Kingdom
| | - Aristides D Tagalakis
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, London, United Kingdom
| | - Maria D Manunta
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, London, United Kingdom
| | - Stephen L Hart
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, London, United Kingdom
| | - Peng T Khaw
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, United Kingdom
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9
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Role of liposome and peptide in the synergistic enhancement of transfection with a lipopolyplex vector. Sci Rep 2015; 5:9292. [PMID: 25786833 PMCID: PMC4365389 DOI: 10.1038/srep09292] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 02/26/2015] [Indexed: 01/22/2023] Open
Abstract
Lipopolyplexes are of widespread interest for gene therapy due to their multifunctionality and high transfection efficiencies. Here we compared the biological and biophysical properties of a lipopolyplex formulation with its lipoplex and polyplex equivalents to assess the role of the lipid and peptide components in the formation and function of the lipopolyplex formulation. We show that peptide efficiently packaged plasmid DNA forming spherical, highly cationic nanocomplexes that are taken up efficiently by cells. However, transgene expression was poor, most likely due to endosomal degradation since the polyplex lacks membrane trafficking properties. In addition the strong peptide-DNA interaction may prevent plasmid release from the complex and so limit plasmid DNA availability. Lipid/DNA lipoplexes, on the other hand, produced aggregated masses that showed poorer cellular uptake than the polyplex but contrastingly greater levels of transgene expression. This may be due to the greater ability of lipoplexes relative to polyplexes to promote endosomal escape. Lipopolyplex formulations formed spherical, cationic nanocomplexes with efficient cellular uptake and significantly enhanced transfection efficiency. The lipopolyplexes combined the optimal features of lipoplexes and polyplexes showing optimal cell uptake, endosomal escape and availability of plasmid for transcription, thus explaining the synergistic increase in transfection efficiency.
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Affiliation(s)
- Bethany Powell Gray
- Department of Internal Medicine and The Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8807, United States
| | - Kathlynn C. Brown
- Department of Internal Medicine and The Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8807, United States
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11
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Tagalakis AD, Kenny GD, Bienemann AS, McCarthy D, Munye MM, Taylor H, Wyatt MJ, Lythgoe MF, White EA, Hart SL. PEGylation improves the receptor-mediated transfection efficiency of peptide-targeted, self-assembling, anionic nanocomplexes. J Control Release 2013; 174:177-87. [PMID: 24269968 DOI: 10.1016/j.jconrel.2013.11.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Revised: 11/10/2013] [Accepted: 11/13/2013] [Indexed: 01/04/2023]
Abstract
Non-viral vector formulations comprise typically complexes of nucleic acids with cationic polymers or lipids. However, for in vivo applications cationic formulations suffer from problems of poor tissue penetration, non-specific binding to cells, interaction with serum proteins and cell adhesion molecules and can lead to inflammatory responses. Anionic formulations may provide a solution to these problems but they have not been developed to the same extent as cationic formulations due to difficulties of nucleic acid packaging and poor transfection efficiency. We have developed novel PEGylated, anionic nanocomplexes containing cationic targeting peptides that act as a bridge between PEGylated anionic liposomes and plasmid DNA. At optimized ratios, the components self-assemble into anionic nanocomplexes with a high packaging efficiency of plasmid DNA. Anionic PEGylated nanocomplexes were resistant to aggregation in serum and transfected cells with a far higher degree of receptor-targeted specificity than their homologous non-PEGylated anionic and cationic counterparts. Gadolinium-labeled, anionic nanoparticles, administered directly to the brain by convection-enhanced delivery displayed improved tissue penetration and dispersal as well as more widespread cellular transfection than cationic formulations. Anionic PEGylated nanocomplexes have widespread potential for in vivo gene therapy due to their targeted transfection efficiency and ability to penetrate tissues.
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Affiliation(s)
- Aristides D Tagalakis
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK.
| | - Gavin D Kenny
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Alison S Bienemann
- Functional Neurosurgery Research Group, School of Clinical Sciences, AMBI Labs, University of Bristol, Southmead Hospital, Bristol BS10 5NB, UK
| | - David McCarthy
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London WC1N 1AX, UK
| | - Mustafa M Munye
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Hannah Taylor
- Functional Neurosurgery Research Group, School of Clinical Sciences, AMBI Labs, University of Bristol, Southmead Hospital, Bristol BS10 5NB, UK
| | - Marcella J Wyatt
- Functional Neurosurgery Research Group, School of Clinical Sciences, AMBI Labs, University of Bristol, Southmead Hospital, Bristol BS10 5NB, UK
| | - Mark F Lythgoe
- UCL Centre for Advanced Biological Imaging, Division of Medicine and Institute of Child Health, University College London, 72 Huntley Street, London, WC1E 6DD, UK
| | - Edward A White
- Functional Neurosurgery Research Group, School of Clinical Sciences, AMBI Labs, University of Bristol, Southmead Hospital, Bristol BS10 5NB, UK
| | - Stephen L Hart
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
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12
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Meng QH, Irvine S, Tagalakis AD, McAnulty RJ, McEwan JR, Hart SL. Inhibition of neointimal hyperplasia in a rabbit vein graft model following non-viral transfection with human iNOS cDNA. Gene Ther 2013; 20:979-86. [PMID: 23636244 PMCID: PMC3795475 DOI: 10.1038/gt.2013.20] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 03/04/2013] [Accepted: 03/22/2013] [Indexed: 11/13/2022]
Abstract
Vein graft failure caused by neointimal hyperplasia (IH) after coronary artery bypass grafting with saphenous veins is a major clinical problem. The lack of safe and efficient vectors for vascular gene transfer has significantly hindered progress in this field. We have developed a Receptor-Targeted Nanocomplex (RTN) vector system for this purpose and assessed its therapeutic efficacy in a rabbit vein graft model of bypass grafting. Adventitial delivery of β-Galactosidase showed widespread transfection throughout the vein wall on day 7, estimated at about 10% of cells in the adventitia and media. Vein grafts were then transfected with a plasmid encoding inducible nitric oxide synthase (iNOS) and engrafted into the carotid artery. Fluorescent immunohistochemistry analysis of samples from rabbits killed at 7 days after surgery showed that mostly endothelial cells and macrophages were transfected. Morphometric analysis of vein graft samples from the 28-day groups showed approximately a 50% reduction of neointimal thickness and 64% reduction of neointimal area in the iNOS-treated group compared with the surgery control groups. This study demonstrates efficacy of iNOS gene delivery by the RTN formulation in reducing IH in the rabbit model of vein graft disease.
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Affiliation(s)
- Q-H Meng
- Molecular Immunology Unit, UCL Institute of Child Health, University College London, London, UK
| | - S Irvine
- Molecular Immunology Unit, UCL Institute of Child Health, University College London, London, UK
| | - A D Tagalakis
- Molecular Immunology Unit, UCL Institute of Child Health, University College London, London, UK
| | - R J McAnulty
- Centre for Inflammation and Tissue Repair, UCL Respiratory, University College London, London, UK
| | - J R McEwan
- Centre for Cardiovascular Medicine and Biology, University College London, London, UK
| | - S L Hart
- Molecular Immunology Unit, UCL Institute of Child Health, University College London, London, UK
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13
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Tagalakis AD, Saraiva L, McCarthy D, Gustafsson KT, Hart SL. Comparison of nanocomplexes with branched and linear peptides for siRNA delivery. Biomacromolecules 2013; 14:761-70. [PMID: 23339543 DOI: 10.1021/bm301842j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Efficient delivery of small interfering RNA (siRNA) remains the greatest technological barrier to the clinical implementation of RNA interference strategies. We are investigating the relationship between the biophysical properties of siRNA nanocomplexes and their transfection efficiency as an approach to the generation of improved formulations. Peptide-based formulations are of great interest, and so in this study we have compared nanocomplex formulations for siRNA delivery containing linear and branched oligolysine or oligoarginine peptides. Peptides were combined with cationic liposomes in siRNA formulations and compared for transfection efficiency, siRNA packaging efficiency, biophysical properties, and particle stability. Nanocomplexes containing linear peptides were more condensed and stable than branched peptide formulations; however, their silencing activity was lower, suggesting that their greater stability might limit siRNA release within the cell. Thus, differences in transfection appeared to be associated with differences in packaging and stability, indicating the importance of optimizing this feature in siRNA nanocomplexes.
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Affiliation(s)
- Aristides D Tagalakis
- Wolfson Centre for Gene Therapy of Childhood Disease, UCL Institute of Child Health, 30 Guilford Street, London, WC1N 1EH, UK
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Writer MJ, Kyrtatos PG, Bienemann AS, Pugh JA, Lowe AS, Villegas-Llerena C, Kenny GD, White EA, Gill SS, McLeod CW, Lythgoe MF, Hart SL. Lipid peptide nanocomplexes for gene delivery and magnetic resonance imaging in the brain. J Control Release 2012; 162:340-8. [PMID: 22800579 PMCID: PMC3657147 DOI: 10.1016/j.jconrel.2012.07.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 06/29/2012] [Accepted: 07/03/2012] [Indexed: 11/16/2022]
Abstract
Gadolinium-labelled nanocomplexes offer prospects for the development of real-time, non-invasive imaging strategies to visualise the location of gene delivery by MRI. In this study, targeted nanoparticle formulations were prepared comprising a cationic liposome (L) containing a Gd-chelated lipid at 10, 15 and 20% by weight of total lipid, a receptor-targeted, DNA-binding peptide (P) and plasmid DNA (D), which electrostatically self-assembled into LPD nanocomplexes. The LPD formulation containing the liposome with 15% Gd-chelated lipid displayed optimal peptide-targeted, transfection efficiency. MRI conspicuity peaked at 4h after incubation of the nanocomplexes with cells, suggesting enhancement by cellular uptake and trafficking. This was supported by time course confocal microscopy analysis of transfections with fluorescently-labelled LPD nanocomplexes. Gd-LPD nanocomplexes delivered to rat brains by convection-enhanced delivery were visible by MRI at 6 h, 24 h and 48 h after administration. Histological brain sections analysed by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) confirmed that the MRI signal was associated with the distribution of Gd(3+) moieties and differentiated MRI signals due to haemorrhage. The transfected brain cells near the injection site appeared to be mostly microglial. This study shows the potential of Gd-LPD nanocomplexes for simultaneous delivery of contrast agents and genes for real-time monitoring of gene therapy in the brain.
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Affiliation(s)
- Michele J. Writer
- Molecular Immunology Unit, UCL Institute of Child Health, London WC1N 1EH, UK
| | - Panagiotis G. Kyrtatos
- Centre for Advanced Biomedical Imaging, Department of Medicine and UCL Institute of Child Health, University College London, London WC1E 6DD, UK
| | - Alison S. Bienemann
- The Functional Neurosurgery Research Group, Bristol University, Institute of Clinical Neurosciences, Southmead Hospital, Bristol BS16 1LE, UK
| | - John A. Pugh
- Centre For Analytical Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Andrew S. Lowe
- Centre for Advanced Biomedical Imaging, Department of Medicine and UCL Institute of Child Health, University College London, London WC1E 6DD, UK
| | | | - Gavin D. Kenny
- Molecular Immunology Unit, UCL Institute of Child Health, London WC1N 1EH, UK
| | - Edward A. White
- The Functional Neurosurgery Research Group, Bristol University, Institute of Clinical Neurosciences, Southmead Hospital, Bristol BS16 1LE, UK
| | - Steven S. Gill
- The Functional Neurosurgery Research Group, Bristol University, Institute of Clinical Neurosciences, Southmead Hospital, Bristol BS16 1LE, UK
| | - Cameron W. McLeod
- Centre For Analytical Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Mark F. Lythgoe
- Centre for Advanced Biomedical Imaging, Department of Medicine and UCL Institute of Child Health, University College London, London WC1E 6DD, UK
| | - Stephen L. Hart
- Molecular Immunology Unit, UCL Institute of Child Health, London WC1N 1EH, UK
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15
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Tagalakis AD, He L, Saraiva L, Gustafsson KT, Hart SL. Receptor-targeted liposome-peptide nanocomplexes for siRNA delivery. Biomaterials 2011; 32:6302-15. [DOI: 10.1016/j.biomaterials.2011.05.022] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 05/05/2011] [Indexed: 01/08/2023]
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Kudsiova L, Fridrich B, Ho J, Mustapa MFM, Campbell F, Welser K, Keppler M, Ng T, Barlow DJ, Tabor AB, Hailes HC, Lawrence MJ. Lipopolyplex Ternary Delivery Systems Incorporating C14 Glycerol-Based Lipids. Mol Pharm 2011; 8:1831-47. [DOI: 10.1021/mp2001796] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laila Kudsiova
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo Campus, London SE1 9NH, U.K
| | - Barbara Fridrich
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo Campus, London SE1 9NH, U.K
| | - Jimmy Ho
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - M. Firouz Mohd Mustapa
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Frederick Campbell
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Katharina Welser
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Melanie Keppler
- Randall Division of Cell and Molecular Biophysics, King’s College London, Henriette Raphael Building, Guy's Campus, London SE1 1UL, U.K
| | - Tony Ng
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
- Randall Division of Cell and Molecular Biophysics, King’s College London, Henriette Raphael Building, Guy's Campus, London SE1 1UL, U.K
| | - David J. Barlow
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo Campus, London SE1 9NH, U.K
| | - Alethea B. Tabor
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Helen C. Hailes
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - M. Jayne Lawrence
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo Campus, London SE1 9NH, U.K
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17
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Abstract
Gene transfer within the cardiovascular system was first demonstrated in 1989 yet, despite extensive basic-science and clinical research, unequivocal benefit in the clinical setting remains to be demonstrated. Potential reasons for this include the fact that recombinant viral vectors, used in the majority of clinical studies, have inherent problems with immunogenicity that are difficult to circumvent. Attention has turned therefore to plasmid vectors, which possess many advantages over viruses in terms of safety and ease of use, and many clinical studies have now been performed using non-viral technology. This review will provide an overview of clinical trials for cardiovascular disease using plasmid vectors, recent developments in plasmid delivery and design, and potential directions for this modality of gene therapy.
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Affiliation(s)
- Paul D Williams
- Manchester Academic Health Science Centre, School of Biomedicine, Vascular Gene Therapy Unit, Core Technology Facility, The University of Manchester, 46 Grafton Street, Manchester M13 9NT, UK.
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18
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Grosse SM, Tagalakis AD, Mustapa MFM, Elbs M, Meng Q, Mohammadi A, Tabor AB, Hailes HC, Hart SL. Tumor‐specific gene transfer with receptor‐mediated nanocomplexes modified by polyethylene glycol shielding and endosomally cleavable lipid and peptide linkers. FASEB J 2010; 24:2301-13. [DOI: 10.1096/fj.09-144220] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Stephanie M. Grosse
- Molecular Immunology UnitInstitute of Child HealthUniversity College LondonLondonUK
| | | | | | - Martin Elbs
- Department of ChemistryUniversity College LondonLondonUK
| | - Qing‐Hai Meng
- Molecular Immunology UnitInstitute of Child HealthUniversity College LondonLondonUK
| | | | | | | | - Stephen L. Hart
- Molecular Immunology UnitInstitute of Child HealthUniversity College LondonLondonUK
- Genex Biosystems LtdLondonUK
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19
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Hart SL. Multifunctional nanocomplexes for gene transfer and gene therapy. Cell Biol Toxicol 2010; 26:69-81. [DOI: 10.1007/s10565-009-9141-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 10/21/2009] [Indexed: 01/28/2023]
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20
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Development of viral vectors for use in cardiovascular gene therapy. Viruses 2010; 2:334-371. [PMID: 21994642 PMCID: PMC3185614 DOI: 10.3390/v2020334] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 01/15/2010] [Accepted: 01/26/2010] [Indexed: 12/16/2022] Open
Abstract
Cardiovascular disease represents the most common cause of mortality in the developed world but, despite two decades of promising pre-clinical research and numerous clinical trials, cardiovascular gene transfer has so far failed to demonstrate convincing benefits in the clinical setting. In this review we discuss the various targets which may be suitable for cardiovascular gene therapy and the viral vectors which have to date shown the most potential for clinical use. We conclude with a summary of the current state of clinical cardiovascular gene therapy and the key trials which are ongoing.
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21
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Pangburn TO, Petersen MA, Waybrant B, Adil MM, Kokkoli E. Peptide- and aptamer-functionalized nanovectors for targeted delivery of therapeutics. J Biomech Eng 2009; 131:074005. [PMID: 19655996 DOI: 10.1115/1.3160763] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Targeted delivery of therapeutics is an area of vigorous research, and peptide- and aptamer-functionalized nanovectors are a promising class of targeted delivery vehicles. Both peptide- and aptamer-targeting ligands can be readily designed to bind a target selectively with high affinity, and more importantly are molecules accessible by chemical synthesis and relatively compact compared with antibodies and full proteins. The multitude of peptide ligands that have been used for targeted delivery are covered in this review, with discussion of binding selectivity and targeting performance for these peptide sequences where possible. Aptamers are RNA or DNA strands evolutionarily engineered to specifically bind a chosen target. Although use of aptamers in targeted delivery is a relatively new avenue of research, the current state of the field is covered and promises of future advances in this area are highlighted. Liposomes, the classic drug delivery vector, and polymeric nanovectors functionalized with peptide or aptamer binding ligands will be discussed in this review, with the exclusion of other drug delivery vehicles. Targeted delivery of therapeutics, from DNA to classic small molecule drugs to protein therapeutics, by these targeted nanovectors is reviewed with coverage of both in vitro and in vivo deliveries. This is an exciting and dynamic area of research and this review seeks to discuss its broad scope.
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Affiliation(s)
- Todd O Pangburn
- Department of Chemical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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22
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Mustapa MFM, Grosse SM, Kudsiova L, Elbs M, Raiber EA, Wong JB, Brain APR, Armer HEJ, Warley A, Keppler M, Ng T, Lawrence MJ, Hart SL, Hailes HC, Tabor AB. Stabilized Integrin-Targeting Ternary LPD (Lipopolyplex) Vectors for Gene Delivery Designed To Disassemble Within the Target Cell. Bioconjug Chem 2009; 20:518-32. [DOI: 10.1021/bc800450r] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- M. Firouz Mohd Mustapa
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Stephanie M. Grosse
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Laila Kudsiova
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Martin Elbs
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Eun-Ang Raiber
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - John B. Wong
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Anthony P. R. Brain
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Hannah E. J. Armer
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Alice Warley
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Melanie Keppler
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Tony Ng
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - M. Jayne Lawrence
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Stephen L. Hart
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Helen C. Hailes
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
| | - Alethea B. Tabor
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, Wolfson Centre for Gene Therapy of Childhood Disease, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, School of Biomedical and Health Sciences, Pharmaceutical Science Research Division, King’s College London, Franklin-Wilkins Building, Stamford Street, London SE1 9NH, Centre for Ultrastructure Imaging, King’s College London, New Hunt’s House,
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23
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Bhattacharya S, Bajaj A. Advances in gene delivery through molecular design of cationic lipids. Chem Commun (Camb) 2009:4632-56. [DOI: 10.1039/b900666b] [Citation(s) in RCA: 232] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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