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Akbaba H, Erel-Akbaba G, Senturk S. Special Focus Issue Part II: Recruitment of solid lipid nanoparticles for the delivery of CRISPR/Cas9: primary evaluation of anticancer gene editing. Nanomedicine (Lond) 2021; 16:963-978. [PMID: 33970666 DOI: 10.2217/nnm-2020-0412] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Aim: The CRISPR/Cas9 system is a promising gene-editing tool for various anticancer therapies; however, development of a biocompatible, nonviral and efficient delivery of CRISPR/Cas9 expression systems remains a challenge. Materials & methods: Solid lipid nanoparticles (SLNs) were produced based on pseudo and 3D ternary plots. Obtained SLNs and their complexes with PX458 plasmid DNA were characterized and evaluated in terms of cytotoxicity and transfection efficiency. Results: SLNs were found to be nanosized, monodispersed, stable and nontoxic. Furthermore, they revealed similar transfection efficiency as the positive control. Conclusion: Overall, we have achieved a good SLN basis for CRISPR/Cas9 delivery and have the potential to produce SLNs with targeted anticancer properties by modifying production parameters and components to facilitate translating CRISPR/Cas9 into preclinical studies.
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Affiliation(s)
- Hasan Akbaba
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Ege University, Izmir, 35100, Turkey
| | - Gulsah Erel-Akbaba
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Izmir Katip Celebi University, Izmir, 35620, Turkey
| | - Serif Senturk
- Izmir Biomedicine & Genome Center, Izmir, 35340, Turkey.,Genome Sciences & Molecular Biotechnology, Izmir International Biomedicine & Genome Institute, Dokuz Eylul University, Izmir, 35340, Turkey
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Smole A, Krajnik AK, Oblak A, Pirher N, Jerala R. Delivery system for the enhanced efficiency of immunostimulatory nucleic acids. Innate Immun 2012; 19:53-65. [PMID: 22732733 DOI: 10.1177/1753425912450346] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Toll-like receptors (TLRs) play a key role in the recognition of pathogen-associated molecular patterns, including immunostimulatory nucleic acids (INAs). INAs are recognized by TLRs in endosomes, leading to the activation of signalling pathways that activate the innate immune response. This feature makes INAs and their synthetic analogues useful as adjuvants in vaccines and in cancer treatment. We tested a delivery system for the improvement of the therapeutic effect of INAs which consists of a conjugate between transferrin (Tf) and poly-L-lysine (PLL). Tf is a ligand of the transferrin receptor (TfR) and is internalized via receptor-mediated endocytosis, while PLL binds negatively charged INAs. The TfPLL conjugate protected TLR3 ligand polyinosinic:polycytidylic acid [poly(I:C)] from RNase degradation and enhanced the uptake of poly(I:C) in HeLa cells. Co-localization between TfPLL-bound poly(I:C) and lysosomes demonstrated delivery into the endosomal pathway. Time dependence of the production of IL-6 in the primary cell line showed that TfPLL conjugate enabled a gradual release of poly(I:C) and stronger activation of TLR3 receptor in comparison with poly(I:C) alone. Only 3 h of stimulation by poly(I:C) + TfPLL complexes initiated a strong immune response in contrast to poly(I:C) alone. The poly(I:C) + TfPLL complexes have potential use for development of advanced vaccine adjuvants and targeted cancer immune therapy in cells that express higher levels of TfR.
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Affiliation(s)
- Anze Smole
- National Institute of Chemistry, Department of Biotechnology, Ljubljana, Slovenia
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Dhanoya A, Chain BM, Keshavarz-Moore E. The impact of DNA topology on polyplex uptake and transfection efficiency in mammalian cells. J Biotechnol 2011; 155:377-86. [DOI: 10.1016/j.jbiotec.2011.07.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Revised: 06/22/2011] [Accepted: 07/16/2011] [Indexed: 01/14/2023]
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4
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Novel supramolecular gelation route to in situ entrapment and sustained delivery of plasmid DNA. J Colloid Interface Sci 2011; 364:566-73. [PMID: 21925676 DOI: 10.1016/j.jcis.2011.08.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 08/19/2011] [Accepted: 08/20/2011] [Indexed: 12/12/2022]
Abstract
In this work, cationic block copolymer (F-68-PLL) composed of Pluronic F-68 and poly(L-lysine) segments was first prepared for the binding with plasmid DNA due to the electrostatic interaction between poly(L-lysine) segments and plasmid DNA, and subsequently used to interact with α-cyclodextrin (α-CD) in aqueous system for the supramolecular gelation by the inclusion complexation between Pluronic F-68 segments and α-CD. It was found that such a fabrication process could lead to the in situ entrapment of plasmid DNA into the supramolecular hydrogel matrix under mild conditions. Depending on the amounts of F-68-PLL and α-CD, the resultant hybrid hydrogel was found to have adjustable gelation time and mechanical strength. For the plasmid DNA complexes released from the supramolecular hydrogel, controlled release and sustained gene transfection were confirmed.
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Smyth HD, Hickey AJ. Pulmonary Delivery of Plasmid DNA for Disease Prevention and Therapy. CONTROLLED PULMONARY DRUG DELIVERY 2011. [PMCID: PMC7122476 DOI: 10.1007/978-1-4419-9745-6_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
For gene delivery to the lung, the challenges are high, but successful treatment of cystic fibrosis or achieving immunity against the global infectious diseases provide an allure that cannot be ignored. This chapter summarizes and reviews nonviral DNA delivery for both gene therapy and DNA vaccination in the lung. Aerosolization of DNA is evaluated, and the stability during this process is discussed. Carriers for DNA are then discussed including lipoplexes and polyplexes, with a particular focus on systems that achieve good transfection and minimize potential toxicity. Then principles of DNA vaccination are introduced, and the advantages of pulmonary vaccination are discussed. Finally, the transport of plasmid DNA vaccines into the lungs is reviewed.
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Affiliation(s)
- Hugh D.C. Smyth
- , Pharmaceutics Division - PHR 4.214, University of Texas, University Station 1, Austin, 78712 USA
| | - Anthony J. Hickey
- Eshelman School of Pharmacy, Division of Molecular Pharmaceutics, University of North Carolina, Chapel Hill, 27599 North Carolina USA
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6
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Magnusson JP, Saeed AO, Fernández-Trillo F, Alexander C. Synthetic polymers for biopharmaceutical delivery. Polym Chem 2011. [DOI: 10.1039/c0py00210k] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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7
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Yu H, Deng C, Tian H, Lu T, Chen X, Jing X. Chemo-physical and biological evaluation of poly(L-lysine)-grafted chitosan copolymers used for highly efficient gene delivery. Macromol Biosci 2010; 11:352-61. [PMID: 21188696 DOI: 10.1002/mabi.201000283] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Revised: 10/08/2010] [Indexed: 12/31/2022]
Abstract
For the success of non-viral gene delivery, it is of great importance to develop gene vectors with high efficiency but low toxicity. We demonstrate that PLL-grafted chitosan copolymers combine the advantages of PLL with its good pDNA-binding ability and of chitosan with its good biocompatibility. The chemo-physical properties of the prepared Chi-g-PLL copolymers are thoroughly characterized. The in vitro transfection study shows that the copolymers have a much higher gene transfer ability than the starting materials chitosan and PLL. A positive correlation between PLL chain lengths and transfection efficiency of the copolymers is found. Our results suggest that these novel Chi-g-PLL copolymers are good candidates for gene delivery in vivo.
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Affiliation(s)
- Haijun Yu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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8
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Okoroukwu ON, Green GR, D’Souza MJ. Development of albumin microspheres containing Sp H1-DNA complexes: A novel gene delivery system. J Microencapsul 2010; 27:142-9. [DOI: 10.3109/02652040903052028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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9
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Innovative strategies for co-delivering antigens and CpG oligonucleotides. Adv Drug Deliv Rev 2009; 61:205-17. [PMID: 19272328 DOI: 10.1016/j.addr.2008.12.013] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/15/2008] [Indexed: 01/12/2023]
Abstract
Cytosine-phosphorothioate-guanine oligodeoxynucleotides (CpG ODN) is a recent class of immunostimulatory adjuvants that includes unmethylated CpG dinucleotide sequences similar to those commonly found in bacterial DNA. CpG ODN specifically triggers toll like receptor 9 (TLR9), which is found within phagoendosomes of antigen presenting cells (APCs) such as dendritic cells (DCs). CpG ODN triggers activation and maturation of DCs and helps to increase expression of antigens. CpG ODN can be used to induce polarized Th1 type immune responses. Several studies have shown that antigens and CpG ODN must be co-localized in the same APC to generate the most potent therapeutic antigen-specific immune responses. Delivery vehicles can be utilized to ensure co-delivery of antigens and CpG ODN to the same APCs and to significantly increase uptake by APCs. These strategies can result in antigen-specific immune responses that are 5 to 500-fold greater than administration of antigen alone. In this review, we discuss several recent and innovative strategies to co-delivering antigens and CpG ODN adjuvants to APCs. These approaches include the utilization of conjugate molecules, multi-component nanorods, liposomes, biodegradable microparticles, pulsatile release chips and cell-microparticle hybrids.
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Sharma R, Lee JS, Bettencourt RC, Xiao C, Konieczny SF, Won YY. Effects of the incorporation of a hydrophobic middle block into a PEG-polycation diblock copolymer on the physicochemical and cell interaction properties of the polymer-DNA complexes. Biomacromolecules 2008; 9:3294-307. [PMID: 18942877 DOI: 10.1021/bm800876v] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
One-component homopolymers of cationic monomers (polycations) and diblock copolymers comprising poly(ethylene glycol) (PEG) and a polycation block have been the most widely used types of polymers for the formulation of polymer-based gene delivery systems. In this study, we incorporate a hydrophobic middle block into the conventional PEG-polycation architecture and investigate the effects of this hydrophobic modification on the physicochemical and cell-level biological properties of the polymer-DNA complexes that are relevant to gene delivery applications. The ABC-type triblock copolymer used in this study consists of (A) PEG, (B) hydrophobic poly( n-butyl acrylate) (PnBA), and (C) cationic poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) component polymers. The properties of the triblock copolymer/DNA complexes are compared with those of two other more conventional DNA carriers derived, respectively, using a PDMAEMA homopolymer and a PEG-PDMAEMA diblock copolymer that had comparable molecular weights for individual blocks. In aqueous solution, the PEG-PnBA-PDMAEMA polymer forms positively charged spherical micelles. The electrostatic complexation of these micelles with plasmid DNA molecules results in the formation of stable small-sized DNA particles that are coated with a micelle monolayer, as confirmed by agarose gel electrophoresis, dynamic light scattering (DLS), and cryogenic transmission electron microscopy (cryo-TEM). Proton nuclear magnetic resonance ( (1)H NMR) spectroscopy measurements indicate that the whole micelle-DNA assembly (named "micelleplex" for convenience) is shielded predominantly by the PEG chains. DLS and optical microscopy imaging measurements indicate that compared with PDMAEMA-DNA polyplexes, the micelleplexes have a significantly lower tendency to aggregate under physiological salt concentrations and show reduced interactions with negatively charged components in serum such as albumin and erythrocytes. While the micelleplexes are comparable to the PEG-PDMAEMA-based DNA polyplexes in terms of their stability against aggregation under high salt concentrations and in the presence of the albumin protein, they have a slightly higher tendency to interact with erythrocytes than the diblock copolymer polyplexes. Agarose gel electrophoresis measurements indicate that relative to the PEG-PDMAEMA polyplexes, the micelleplexes provide better protection of the encapsulated DNA from enzymatic degradation and also exhibit greater stability against disintegration induced by polyanionic additives; in these respects, the PDMAEMA homopolymer-based polyplexes show the best performance. In vitro studies in HeLa cells indicate that the PDMAEMA polyplexes show the highest gene transfection efficiency among the three different gene delivery systems. Between the micelleplexes and the PEG-PDMAEMA polyplexes, a higher gene transfection efficiency is observed with the latter system. All three formulations show comparable levels of cytotoxicity in HeLa cells.
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Affiliation(s)
- Rahul Sharma
- School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
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11
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Nie Y, Zhang ZR, Duan YR. Combined Use of Polycationic Peptide and Biodegradable Macromolecular Polymer as a Novel Gene Delivery System: A Preliminary Study. Drug Deliv 2008; 13:441-6. [PMID: 17002972 DOI: 10.1080/10717540600640302] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
Plasmid(p) DNA was condensed by polycationic peptide polylysine (PLL) to be a core and then encapsulated in biodegradable monomethoxy (polyethyleneglycol)-poly(lactide-co-glycolide)-monomethoxy (poly-ethylene glycol) (PELGE) to form core-shell nanoparticles as a novel gene delivery system PPD (PELGE-PLL-DNA). Nanoparticles formed from PPD had several complementary properties such as improved biocompatibility, decreased cytotoxicity, enhanced pDNA integrity, and the characteristic of lysosomal escape as PLGA nanoparticles. The results demonstrated the potential of this PPD as an efficient gene delivery system.
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Affiliation(s)
- Yu Nie
- Key Laboratory of Drug Targeting and Novel Drug Delivery Systems, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, PR China
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12
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Zhang XQ, Intra J, Salem AK. Comparative study of poly (lactic-co-glycolic acid)-poly ethyleneimine-plasmid DNA microparticles prepared using double emulsion methods. J Microencapsul 2008; 25:1-12. [DOI: 10.1080/02652040701659347] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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13
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Ruan G, Ng JK, Feng SS. Effects of polymer, organic solvent and mixing strength on integrity of proteins and liposomes encapsulated in polymeric microspheres fabricated by the double emulsion process. J Microencapsul 2008; 21:399-412. [PMID: 15513747 DOI: 10.1080/02652040410001729214] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The double emulsion process has commonly been applied to encapsulate water-soluble bioactive agents into polymeric microspheres. However, the integrity of many of these agents may be destroyed by the highly energetic procedures such as sonication that are routinely used to produce stable water-in-oil (w/o) emulsion. The aim of this research was to pursue the possibility of replacing the sonication by a mild emulsification procedure such as vortex mixing, with the use of certain materials to help to obtain stable w/o emulsion. The following materials were examined: poly(lactide-co-ethylene glycol) (PELA) as the polymer, ethyl acetate and acetone as the solvents, poly(vinyl alcohol) (PVA) and d-alpha tocopheryl polyethylene glycol 1000 succinate (Vitamin E TPGS) as the emulsifiers in w/o emulsion. The experimental results, with human serum albumin (HSA) as the encapsulated agent, showed that, when vortex mixing was used, these materials could significantly improve w/o emulsion stability and help to obtain satisfactory encapsulation effects, i.e. high encapsulation efficiency (EE) and low initial release burst. A delicate structure, i.e. liposomes, which is very sensitive to sonication, was then incorporated into microspheres by the 'modified double emulsion process'. It was found that the liposomes were intact and the encapsulation effects were good. Therefore, it can be concluded that the modified double emulsion process could be advantageous for the encapsulation of delicate substances.
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Affiliation(s)
- G Ruan
- Department of Chemical and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
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Ramgopal Y, Mondal D, Venkatraman SS, Godbey WT. Sustained release of complexed and naked DNA from polymer films. J Biomed Mater Res B Appl Biomater 2008; 85:496-503. [DOI: 10.1002/jbm.b.30971] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Zhang XQ, Intra J, Salem AK. Conjugation of Polyamidoamine Dendrimers on Biodegradable Microparticles for Nonviral Gene Delivery. Bioconjug Chem 2007; 18:2068-76. [PMID: 17848077 DOI: 10.1021/bc070116l] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We report on the preparation and characterization of poly(D, L-lactide-co-glycolide) (PLGA) microparticles with surface-conjugated polyamidoamine (PAMAM) dendrimers of varying generations. The buffering capacity and zeta-potential of the PLGA PAMAM microparticles increased with increasing generation level of the PAMAM dendrimer conjugated. Conjugation of the PAMAM dendrimer to the surface of the PLGA microparticle removed generation-dependent cytotoxicity in HEK293 and COS7 cell lines. PLGA PAMAM pDNA microparticles displayed similar cytotoxicity profiles to unmodified PLGA pDNA microparticles in COS7 cells. A generation three PAMAM dendrimer conjugated to PLGA microparticles significantly increased transfection efficiencies in comparison to unmodified PLGA microparticles.
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Affiliation(s)
- Xue-Qing Zhang
- Division of Pharmaceutics, College of Pharmacy, University of Iowa, Iowa City, IA 52242, USA
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Golda A, Pelisek J, Klocke R, Engelmann MG, Rolland PH, Mekkaoui C, Nikol S. Small Poly- L-Lysines Improve Cationic Lipid-Mediated Gene Transfer in Vascular Cells in vitro and in vivo. J Vasc Res 2007; 44:273-82. [PMID: 17406119 DOI: 10.1159/000101449] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Accepted: 02/07/2007] [Indexed: 11/19/2022] Open
Abstract
The potential of two small poly-L-lysines (sPLLs), low molecular weight sPLL (LMW-L) containing 7-30 lysine residues and L18 with 18 lysine repeats, to enhance the efficiency of liposome-mediated gene transfer (GT) with cationic lipid DOCSPER [1,3-dioleoyloxy-2-(N(5)-carbamoyl-spermine)-propane] in vascular smooth muscle cells (SMCs) was investigated. Dynamic light scattering was used for determination of particle size. Confocal microscopy was applied for colocalization studies of sPLLs and plasmid DNA inside cells. GT was performed in proliferating and quiescent primary porcine SMCs in vitro and in vivo in porcine femoral arteries. At low ionic strength, sPLLs formed small complexes with DNA (50-100 nm). At high ionic strength, large complexes (>1 microm) were observed without any significant differences in particle size between lipoplexes (DOCSPER/DNA) and lipopolyplexes (DOCSPER/sPLL/DNA). Both sPLLs were colocalized with DNA inside cells 24 h after transfection, protecting DNA against degradation. DOCSPER/sPLL/DNA formulations enhanced GT in vitro up to 5-fold, in a porcine model using local periadventitial application up to 1.5-fold. Both sPLLs significantly increased liposome-mediated GT. Poly-L-lysine L18 was superior to LMW-L since it enabled maximal GT at a 10-fold lower concentration. Thus, sPLLs may serve as enhancers for GT applications in SMCs in vitro and in vivo using local delivery.
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Affiliation(s)
- Adam Golda
- Department of Cardiology and Angiology, University Hospital, Westfaelische Wilhelms University, Muenster, Germany
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Hammady T, Nadeau V, Hildgen P. Microemulsion and diafiltration approaches: An attempt to maximize the global yield of DNA-loaded nanospheres. Eur J Pharm Biopharm 2006; 62:143-54. [PMID: 16288856 DOI: 10.1016/j.ejpb.2005.08.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2005] [Revised: 05/03/2005] [Accepted: 08/11/2005] [Indexed: 10/25/2022]
Abstract
The yield of DNA-loaded nanospheres in its widest definition includes encapsulation efficiency and the integrity of the loaded molecules plus the production yield of fabricated nanospheres. The former aspect could be considerably improved by adopting the microemulsion concept to enhance the stability of the primary emulsion during the preparation of nanospheres by the double emulsion solvent-removal method. The droplet size of the mentioned emulsion was monitored by means of photon electron correlation spectroscopy and could serve as an index for emulsion fineness and stability. DNA stability as a function of applied mechanical stress was monitored by horizontal agarose gel electrophoresis. The impact of the primary emulsion on nanosphere porosity was assessed as well. Regarding the second aspect of the global yield of nanospheres, i.e. production yield, a modified diafiltration technique was adopted for the washing and recovery processes in comparison with the traditional and for the conservation of particle size characteristics of the recovered nanospheres.
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Affiliation(s)
- T Hammady
- Faculty of Pharmacy, University of Montréal, Montréal, Qué., Canada
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Pannier AK, Shea LD. Controlled release systems for DNA delivery. Mol Ther 2004; 10:19-26. [PMID: 15233938 DOI: 10.1016/j.ymthe.2004.03.020] [Citation(s) in RCA: 190] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Accepted: 03/24/2004] [Indexed: 12/01/2022] Open
Abstract
Adapting controlled release technologies to the delivery of DNA has the potential to overcome extracellular barriers that limit gene therapy. Controlled release systems can enhance gene delivery and increase the extent and duration of transgene expression relative to more traditional delivery methods (e.g., injection). These systems typically deliver vectors locally, which can avoid distribution to distant tissues, decrease toxicity to nontarget cells, and reduce the immune response to the vector. Delivery vehicles for controlled release are fabricated from natural and synthetic polymers, which function either by releasing the vector into the local tissue environment or by maintaining the vector at the polymer surface. Vector release or binding is regulated by the effective affinity of the vector for the polymer, which depends upon the strength of molecular interactions. These interactions occur through nonspecific binding based on vector and polymer composition or through the incorporation of complementary binding sites (e.g., biotin-avidin). This review examines the delivery of nonviral and viral vectors from natural and synthetic polymers and presents opportunities for continuing developments to increase their applicability.
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Affiliation(s)
- Angela K Pannier
- Department of Interdepartmental Biological Sciences, Northwestern University, 2145 Sheridan Road, E156, Evanston, IL 60208-3120, USA
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Verbaan F, Bos G, Oussoren C, Woodle M, Hennink W, Storm G. A comparative study of different cationic transfection agents for in vivo gene delivery after intravenous administration. J Drug Deliv Sci Technol 2004. [DOI: 10.1016/s1773-2247(04)50021-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
We evaluated the utility of three in vitro methods to monitor the biological potency of PLGA encapsulated DNA. For each assay we also determined whether the biological activity was influenced by the structural profile of DNA isomers. Collectively, the results indicate that all three methods can be used to evaluate the biological activity of DNA extracted from PLGA microspheres, but they are differentially sensitive to the structural changes of plasmid DNA that can occur during microencapsulation and microsphere storage. More specifically, mammalian cell transfection followed by an enzyme assay affords an accurate determination of DNA potency over time and is less influenced by DNA isoform than bacterial transformation. Cell-free transcription/translation systems can also be utilized, and the results of this assay are influenced by DNA isoform. Finally, bacterial transformation was found to be more sensitive to DNA isoform than the other assay methods.
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Affiliation(s)
- T Hao
- ZYCOS Inc., 44 Hartwell Ave, Lexington, MA 02421, USA
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Gebrekidan S, Woo BH, DeLuca PP. Formulation and in vitro transfection efficiency of poly (D, L-lactide-co-glycolide) microspheres containing plasmid DNA for gene delivery. AAPS PharmSciTech 2000; 1:E28. [PMID: 14727893 PMCID: PMC2750452 DOI: 10.1208/pt010428] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The stability, in vitro release, and in vitro cell transfection efficiency of plasmid DNA (pDNA) poly (D,L-lactide-co-glycolide) (PLGA) microsphere formulations were investigated. PLGA microspheres containing free and polylysine (PLL)-complexed pDNA were prepared by a water-oil-water solvent extraction/evaporation technique. Encapsulation enhanced the retention of the supercoiled structure of pDNA as determined by gel electrophoresis. PLL complexation of pDNA prior to encapsulation increased both the stability of the supercoiled form and the encapsulation efficiency. Free pDNA was completely degraded after exposure to DNase, while encapsulation protected the pDNA from enzymatic degradation. Rapid initial in vitro release of pDNA was obtained from microspheres containing free pDNA, while the release from microspheres containing PLL-complexed pDNA was sustained for more than 42 days. Bioactivity of encapsulated pDNA determined by in vitro cell transfection using Chinese hamster ovary cells (CHO) showed that the bioactivity of encapsulated pDNA was retained in both formulations but to a greater extent with PLL-complexed pDNA microspheres. These results demonstrated that PLGA microspheres could be used to formulate a controlled-release delivery system for pDNA that can protect the pDNA from DNase degradation without loss of functional activity.
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Affiliation(s)
- Sisay Gebrekidan
- Faculty of Pharmaceutical Sciences, University of Kentucky College of Pharmacy, 40536 Lexington, KY
| | - Byung H. Woo
- Faculty of Pharmaceutical Sciences, University of Kentucky College of Pharmacy, 40536 Lexington, KY
| | - Patrick P. DeLuca
- Faculty of Pharmaceutical Sciences, University of Kentucky College of Pharmacy, 40536 Lexington, KY
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22
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Capan Y, Woo BH, Gebrekidan S, Ahmed S, DeLuca PP. Influence of formulation parameters on the characteristics of poly(D, L-lactide-co-glycolide) microspheres containing poly(L-lysine) complexed plasmid DNA. J Control Release 1999; 60:279-86. [PMID: 10425333 DOI: 10.1016/s0168-3659(99)00076-0] [Citation(s) in RCA: 95] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study describes the influence of polymer type, surfactant type/concentration, and target drug loading on the particle size, plasmid DNA (pDNA) structure, drug loading efficiency, in vitro release, and protection from DNase I degradation of poly(D, L-lactide-co-glycolide) (PLGA) microspheres containing poly(L-lysine) (PLL) complexed pDNA. PLGA microspheres containing pDNA-PLL were prepared using the water-in-oil-in-water (w-o-w) technique with poly(vinyl alcohol) (PVA) and poly(vinyl pyrrolidone) (PVP) as surfactants in the external aqueous phase. A complex ratio of 1:0.33 (pDNA-PLL, w/w) enhanced the stability of pDNA during microsphere preparation. Higher pDNA-PLL loading efficiency (46.2%) and supercoiled structure (64.9%) of pDNA were obtained from hydrophobic PLGA (M(w) 31000) microspheres compared with hydrophilic PLGA or low-molecular-weight PLGA microspheres. The particle size decreased from 6.6 to 2.2 microm when the concentration of PVA was increased from 1 to 7%. At the same concentration of surfactant, PVA stabilized microspheres showed higher pDNA-PLL loading efficiency (46.2%) than PVP stabilized microspheres (24.1%). Encapsulated pDNA in PLGA microspheres was protected from enzymatic degradation and maintained in the supercoiled form. The pDNA-PLL microspheres showed in vitro release of 95.9 and 84.9% within 38 days from the low-molecular-weight PLGA and hydrophilic PLGA microspheres, respectively, compared to 54.2% release from the hydrophobic, higher-molecular-weight PLGA microspheres. The results suggest loading and release of pDNA-PLL complex can be influenced by surfactant concentration and polymer type.
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Affiliation(s)
- Y Capan
- Hacettepe University, Faculty of Pharmacy, Department of Pharmaceutical Technology, 06100, Ankara, Turkey
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