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Jiang X, Li M, Guo X, Yang M, Rasooly A. Self-assembled DNA-THPS hydrogel as a topical antibacterial agent for wound healing. ACS APPLIED BIO MATERIALS 2019; 2:1262-1269. [PMID: 35005454 PMCID: PMC8733899 DOI: 10.1021/acsabm.8b00818] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a novel and potential wound dressing hydrogel based on DNA and a green industrial microbiocide tetrakis (hydroxymethyl) phosphonium sulfate (THPS) via one-pot self-assembly. Intermolecular electrostatic interaction and hydrogen bonding between DNA and THPS together drive the formation of the adhesive DNT (DNA+THPS) hydrogel, featuring with self-healing, shear-thinning and injectability. This wound dressing hydrogel possesses broad-spectrum antibacterial ability with low cytotoxicity to L929 cells. Furthermore, the wound dressing can reduce the risk of wound infection by releasing THPS to suppress bacterial spread and accelerate wound healing. The low cost and simple preparation may make the hydrogel attractive in biomedical applications and could be a good reference to others.
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Affiliation(s)
- Xingxing Jiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Man Li
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Xiaoxi Guo
- College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, P. R. China
| | - Minghui Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Avraham Rasooly
- National Cancer Institute, National Institutes of Health, Rockville, Maryland 20850, United States
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Matwijczuk A, Kluczyk D, Górecki A, Niewiadomy A, Gagoś M. Solvent Effects on Molecular Aggregation in 4-(5-Heptyl-1,3,4-thiadiazol-2-yl)benzene-1,3-diol and 4-(5-Methyl-1,3,4-thiadiazol-2-yl)benzene-1,3-diol. J Phys Chem B 2016; 120:7958-69. [DOI: 10.1021/acs.jpcb.6b06323] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arkadiusz Matwijczuk
- Department
of Biophysics, University of Life Sciences in Lublin, Akademicka
13, 20-950 Lublin, Poland
| | - Dariusz Kluczyk
- Department
of Cell Biology, Institute of Biology, Maria Curie-Skłodowska University, 20-033 Lublin, Poland
| | - Andrzej Górecki
- Department
of Physical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology of the Jagiellonian University, Gronostajowa 7, 30-387 Krakow, Poland
| | - Andrzej Niewiadomy
- Department
of Chemistry, University of Life Sciences in Lublin, 20-950 Lublin, Poland
- Institute of Industrial Organic Chemistry, Annopol 6, 03-236 Warsaw, Poland
| | - Mariusz Gagoś
- Department
of Cell Biology, Institute of Biology, Maria Curie-Skłodowska University, 20-033 Lublin, Poland
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3
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Matwijczuk A, Kamiński D, Górecki A, Ludwiczuk A, Niewiadomy A, Maćkowski S, Gagoś M. Spectroscopic Studies of Dual Fluorescence in 2-((4-Fluorophenyl)amino)-5-(2,4-dihydroxybenzeno)-1,3,4-thiadiazole. J Phys Chem A 2015; 119:10791-805. [DOI: 10.1021/acs.jpca.5b06475] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Andrzej Górecki
- Department of Physical
Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology of the Jagiellonian University, 31-007 Kraków, Poland
| | - Agnieszka Ludwiczuk
- Chair and Department of Pharmacognosy with Medicinal
Plant Unit, Medical University of Lublin, 1 Chodzki Str., 20-093 Lublin, Poland
| | | | - Sebastian Maćkowski
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, 87-100 Toruń, Poland
| | - Mariusz Gagoś
- Department of Cell Biology, Institute of Biology, Maria Curie-Skłodowska University, 20-033 Lublin, Poland
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Baoum AA, Middaugh CR, Berkland C. DNA complexed with TAT peptide and condensed using calcium possesses unique structural features compared to PEI polyplexes. Int J Pharm 2014; 465:11-7. [DOI: 10.1016/j.ijpharm.2014.01.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Revised: 12/17/2013] [Accepted: 01/29/2014] [Indexed: 11/29/2022]
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5
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Liang X, Li X, Chang J, Duan Y, Li Z. Properties and evaluation of quaternized chitosan/lipid cation polymeric liposomes for cancer-targeted gene delivery. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8683-8693. [PMID: 23763489 DOI: 10.1021/la401166v] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Development of high-stability and efficient nonviral vectors with low cytoxicity is important for targeted tumor gene therapy. In this study, cationic polymeric liposomes (CPLs), with similar lipid bilayer structure and high thermal stability, were prepared from polymeric surfactants of quaternized (carboxymethyl)chitosan with different carbon chains (dodecyl, tetradecyl, hexadecyl, and octadecyl). By comparing different factors that influence gene delivery, tetradecyl-quaternized (carboxymethy)chitosan (TQCMC) CPLs, with suitable size (184.4 ± 17.1 nm), ζ potentials (27.5 ± 4.9 mV), and productivity for synthesis TQCMC (weight yield 13.1%), were selected for gene transfection evaluation in various cancer cell lines. Although TQCMC CPLs have lower gene transfection efficiency compared with cationic liposomes (Lipofectamine 2000) in vitro, they displayed higher reporter gene delivery ability for cancer tissues (bearing U87 and SMMC-7721 tumors) in vivo after intravenous injection. TQCMC CPLs also have lower cell cytotoxicity and lower cytokine production or liver injury for BALB/c mice. We conclude that the CPLs are promising gene delivery systems that may be used to target various cancers.
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Affiliation(s)
- Xiaofei Liang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200032, People's Republic of China
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Das A, Thakur R, Chakraborty A. A steady-state and time-resolved fluorescence study on liposome-calf thymus DNA interaction: probed by an anticancer drug ellipticine. RSC Adv 2013. [DOI: 10.1039/c3ra43037e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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7
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Mandeville JS, Bourassa P, Tajmir-Riahi HA. Probing the Binding of Cationic Lipids with Dendrimers. Biomacromolecules 2012; 14:142-52. [DOI: 10.1021/bm301501y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- J. S. Mandeville
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada
| | - P. Bourassa
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada
| | - H. A. Tajmir-Riahi
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada
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Fluorescence methods for lipoplex characterization. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:2694-705. [DOI: 10.1016/j.bbamem.2011.07.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 06/29/2011] [Accepted: 07/15/2011] [Indexed: 11/24/2022]
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9
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Marty R, N’soukpoé-Kossi CN, Charbonneau DM, Kreplak L, Tajmir-Riahi HA. Structural characterization of cationic lipid-tRNA complexes. Nucleic Acids Res 2009; 37:5197-207. [PMID: 19561199 PMCID: PMC2731917 DOI: 10.1093/nar/gkp543] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 06/08/2009] [Accepted: 06/09/2009] [Indexed: 01/22/2023] Open
Abstract
Despite considerable interest and investigations on cationic lipid-DNA complexes, reports on lipid-RNA interaction are very limited. In contrast to lipid-DNA complexes where lipid binding induces partial B to A and B to C conformational changes, lipid-tRNA complexation preserves tRNA folded state. This study is the first attempt to investigate the binding of cationic lipid with transfer RNA and the effect of lipid complexation on tRNA aggregation and condensation. We examine the interaction of tRNA with cholesterol (Chol), 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP), dioctadecyldimethylammoniumbromide (DDAB) and dioleoylphosphatidylethanolamine (DOPE), at physiological condition, using constant tRNA concentration and various lipid contents. FTIR, UV-visible, CD spectroscopic methods and atomic force microscopy (AFM) were used to analyze lipid binding site, the binding constant and the effects of lipid interaction on tRNA stability, conformation and condensation. Structural analysis showed lipid-tRNA interactions with G-C and A-U base pairs as well as the backbone phosphate group with overall binding constants of K(Chol) = 5.94 (+/- 0.8) x 10(4) M(-1), K(DDAB) = 8.33 (+/- 0.90) x 10(5) M(-1), K(DOTAP) = 1.05 (+/- 0.30) x 10(5) M(-1) and K(DOPE) = 2.75 (+/- 0.50) x 10(4) M(-1). The order of stability of lipid-tRNA complexation is DDAB > DOTAP > Chol > DOPE. Hydrophobic interactions between lipid aliphatic tails and tRNA were observed. RNA remains in A-family structure, while biopolymer aggregation and condensation occurred at high lipid concentrations.
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Affiliation(s)
- Regis Marty
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières, Québec, G9A 5H7 and Department of Physics and Atmospheric Science, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, NS B3H 3J5, Canada
| | - Christophe N. N’soukpoé-Kossi
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières, Québec, G9A 5H7 and Department of Physics and Atmospheric Science, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, NS B3H 3J5, Canada
| | - David M. Charbonneau
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières, Québec, G9A 5H7 and Department of Physics and Atmospheric Science, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, NS B3H 3J5, Canada
| | - Laurent Kreplak
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières, Québec, G9A 5H7 and Department of Physics and Atmospheric Science, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, NS B3H 3J5, Canada
| | - Heidar-Ali Tajmir-Riahi
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières, Québec, G9A 5H7 and Department of Physics and Atmospheric Science, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, NS B3H 3J5, Canada
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Marty R, N'soukpoé-Kossi CN, Charbonneau D, Weinert CM, Kreplak L, Tajmir-Riahi HA. Structural analysis of DNA complexation with cationic lipids. Nucleic Acids Res 2008; 37:849-57. [PMID: 19103664 PMCID: PMC2647290 DOI: 10.1093/nar/gkn1003] [Citation(s) in RCA: 130] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Complexes of cationic liposomes with DNA are promising tools to deliver genetic information into cells for gene therapy and vaccines. Electrostatic interaction is thought to be the major force in lipid–DNA interaction, while lipid-base binding and the stability of cationic lipid–DNA complexes have been the subject of more debate in recent years. The aim of this study was to examine the complexation of calf-thymus DNA with cholesterol (Chol), 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP), dioctadecyldimethylammoniumbromide (DDAB) and dioleoylphosphatidylethanolamine (DOPE), at physiological condition, using constant DNA concentration and various lipid contents. Fourier transform infrared (FTIR), UV-visible, circular dichroism spectroscopic methods and atomic force microscopy were used to analyse lipid-binding site, the binding constant and the effects of lipid interaction on DNA stability and conformation. Structural analysis showed a strong lipid–DNA interaction via major and minor grooves and the backbone phosphate group with overall binding constants of KChol = 1.4 (±0.5) × 104 M−1, KDDAB = 2.4 (±0.80) × 104 M−1, KDOTAP = 3.1 (±0.90) × 104 M−1 and KDOPE = 1.45 (± 0.60) × 104 M−1. The order of stability of lipid–DNA complexation is DOTAP>DDAB>DOPE>Chol. Hydrophobic interactions between lipid aliphatic tails and DNA were observed. Chol and DOPE induced a partial B to A-DNA conformational transition, while a partial B to C-DNA alteration occurred for DDAB and DOTAP at high lipid concentrations. DNA aggregation was observed at high lipid content.
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Affiliation(s)
- Regis Marty
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
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11
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Spectroscopic methods for the physical characterization and formulation of nonviral gene delivery systems. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2008; 434:55-80. [PMID: 18470639 DOI: 10.1007/978-1-60327-248-3_5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Abstract
Currently, with the exception of naked DNA formulations, most pharmaceutical preparations of plasmid DNA employ some type of polycationic delivery vector such as synthetic cationic polymers and lipids to enhance delivery. A number of biophysical techniques are readily available for the structural characterization of plasmid DNA within synthetic gene delivery complexes. Here we present applications of ultraviolet (UV) absorption, circular dichroism (CD), infrared (IR), and fluorescence spectroscopies as well as dynamic light scattering to the structural analysis of the oligonucleotide component of nonviral gene delivery vectors. We also illustrate this approach for the investigation of the formulation of lipoplex and polyplex-based gene delivery systems. To summarize such data, we show how the macromolecular complexes can be represented as vectors in a highly dimensional space in which the components of the vector consist of normalized values of experimental parameters measured as a function of different solution conditions such as pH and ionic strength.
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Ruponen M, Braun CS, Middaugh CR. Biophysical characterization of polymeric and liposomal gene delivery systems using empirical phase diagrams. J Pharm Sci 2006; 95:2101-14. [PMID: 16883552 DOI: 10.1002/jps.20621] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A major problem with the pharmaceutical use of nonviral gene delivery systems arises from their limited characterization due to their size and heterogeneity. In this study, we provide a more intuitive view of their structure and behavior employing an empirically based phase diagram approach. Complexes formed between plasmid DNA and four cationic carriers (a monovalent lipid, the same monovalent lipid combined with a helper lipid, polylysine, and a branched form of polyethyleneimine), at both positive and negative nitrogen/phosphorous ratios, are characterized employing dynamic light scattering, circular dichroism, and extrinsic dye fluorescence as methods sensitive to various aspects of the structure of the complexes. These measurements were performed as a function of pH and ionic strength to perturb the electrostatic contacts that are key to complex formation. Using a multidimensional eigenvalue approach, the data are presented in the form of a colored, five dimensional diagram. The resultant eight empirical phase diagrams display three to five variably resolved phases. In contrast, the phase diagram of the plasmid alone showed only two to three such phases. Each state is assigned to a particular form of the complex in terms of their size, extent of collapse and conformation of the associated DNA component. The utility of this approach is then briefly discussed.
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Affiliation(s)
- Marika Ruponen
- The Department of Pharmaceutical Chemistry, The University of Kansas, Lawrence, Kansas 66047, USA
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Tumanova I, Boyer J, Ausar SF, Burzynski J, Rosencrance D, White J, Scheidel J, Parkinson R, Maguire H, Middaugh CR, Weiner D, Green AP. Analytical and biological characterization of supercoiled plasmids purified by various chromatographic techniques. DNA Cell Biol 2006; 24:819-31. [PMID: 16332179 DOI: 10.1089/dna.2005.24.819] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Supercoiled plasmids are an important component of gene-based delivery vehicles. A number of production methods for clinical applications have been developed, each resulting in very high-quality product with low levels of residual contaminants. There is, however, no consensus on the optimal methods to characterize plasmid quality, and further, to determine if these methods are predictive of either product stability or biological activity. We have produced two plasmids using four production purification methodologies based on PolyFlo and hydrophobic interaction chromatography (HIC), either alone or in tandem processes. In each case, the product was analyzed using standard molecular biological methods. We also performed a number of biophysical analyses such as dynamic light scattering (DLS), circular dichroism (CD), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). Minimal differences were detected among the preparations based on the more standard molecular biological methods. Some small differences were detected, however, using biophysical techniques, particularly FTIR and DSC, which may reflect small variations in plasmid tertiary structure and thermal stability. Stability after heat exposure at 60 degrees C, exposure to fetal bovine serum and long-term storage at 4 degrees C varied between plasmids. One plasmid showed no difference in stability depending on the production process, but the other showed significant differences. Evaluation in vivo in models for gene immunization and gene therapy showed significant differences in the response depending on the method of purification. Preparations using a tandem process of PolyFlo used in two separation modes provided higher biological activity compared to a tandem HIC/PolyFlo process or either resin used alone in a single column process. These data indicate that the process by which supercoiled plasmids are made can influence plasmid stability and biological activity and emphasize the need for more rigorous methods to evaluate supercoiled plasmids as gene-delivery vehicles.
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Braun CS, Fisher MT, Tomalia DA, Koe GS, Koe JG, Middaugh CR. A stopped-flow kinetic study of the assembly of nonviral gene delivery complexes. Biophys J 2005; 88:4146-58. [PMID: 15805171 PMCID: PMC1305645 DOI: 10.1529/biophysj.104.055202] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Stopped-flow circular dichroism and fluorescence spectroscopy are used to characterize the assembly of complexes consisting of plasmid DNA bound to the cationic lipids dimethyldioctadecylammonium bromide and 1, 2-dioleoyl- 3-trimethylammonium-propane and a series of polyamidoamine dendrimers. The kinetics of complexation determined from the stopped-flow circular dichroism measurements suggests complexation occurs within 50 ms. Further analysis, however, was precluded by the presence of mixing (shear) artifacts. Stopped-flow fluorescence employing the high-affinity DNA dyes Hoechst 33258 and YOYO-1 was able to resolve two sequential steps in the assembly of complexes that are assigned to binding/dehydration and condensation events. The rates of each process were determined over the temperature range of 10-50 degrees C and activation energies were determined from the slope of Arrhenius plots. The behavior of polyamidoamine dendrimers can be separated into two classes based on their differing binding modes: generation 2 and the larger generations (G4, G7, and G9). The larger generations have activation energies for binding that follow the trend G4 > G7 > G9. The activation energies for condensation (compaction) of complexes composed of these same dendrimers have the opposite trend G9 > G7 > G4. It is postulated that a balance between a more energetically favorable condensation and less favorable binding may prove beneficial in enhancing gene delivery.
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Affiliation(s)
- Chad S Braun
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, 66047, USA
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Manthorpe M, Hobart P, Hermanson G, Ferrari M, Geall A, Goff B, Rolland A. Plasmid vaccines and therapeutics: from design to applications. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2005; 99:41-92. [PMID: 16568888 DOI: 10.1007/10_003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In the late 1980s, Vical and collaborators discovered that the injection into tissues of unformulated plasmid encoding various proteins resulted in the uptake of the plasmid by cells and expression of the encoded proteins. After this discovery, a period of technological improvements in plasmid delivery and expression and in pharmaceutical and manufacturing development was quickly followed by a plethora of human clinical trials testing the ability of injected plasmid to provide therapeutic benefits. In this chapter, we summarize in detail the technologies used in the most recent company-sponsored clinical trials and discuss the potential for future improvements in plasmid design, manufacturing, delivery, formulation and administration. A generic path for the clinical development of plasmid-based products is outlined and then exemplified using a case study on the development of a plasmid vaccine from concept to clinical trial.
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Voltammetric behaviour of oligonucleotide lipoplexes adsorbed onto glassy carbon electrodes. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wiethoff CM, Koe JG, Koe GS, Middaugh CR. Compositional effects of cationic lipid/DNA delivery systems on transgene expression in cell culture. J Pharm Sci 2004; 93:108-23. [PMID: 14648641 DOI: 10.1002/jps.10519] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Studies of the contribution of various physical properties of cationic lipid/DNA complexes (CLDCs) to their observed transgene expression in vitro were conducted using cationic liposomes composed of the cationic lipids 1,2-dioleoyl-3-trimethylammonium propane (DOTAP) and dimethyldioctadecylammonium bromide (DDAB), with or without equimolar amounts of cholesterol (CHOL) or 1,2-dioleoylphosphatidylethanolamine (DOPE). The relative degree of luciferase expression by CLDCs is dependent on a complex relationship between net charge of the CLDC as well as previously reported properties, such as membrane fluidity and curvature of the cationic bilayer. Assessments were made of the role of these physical properties on CLDC stability in the extracellular medium, the extent of DNA cellular association, and membrane disruption activity. The efficiency of luciferase expression from negatively charged CLDCs is greatly improved by incorporation of DOPE. This result correlates with enhanced resistance to inhibition of gene delivery by heparan sulfate, increased cellular association of DNA, and enhanced membrane disruption activity. Luciferase expression by positively charged CLDCs is greatly reduced by incorporating equimolar amounts of CHOL and DOPE. This result occurs is in spite of increased resistance to heparan sulfate-mediated inhibition of gene delivery, increased DNA cellular association, and enhanced membrane disruption activity. The observed CLDC compositional effects on luciferase expression along with observed effects on the delivery process suggest that a better understanding of the kinetics and specific routes of gene delivery is necessary.
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Affiliation(s)
- Christopher M Wiethoff
- Department of Pharmaceutical Chemistry, The University of Kansas, 2095 Constant Avenue, Lawrence, Kansas 66047, USA
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Choosakoonkriang S, Lobo BA, Koe GS, Koe JG, Middaugh CR. Biophysical characterization of PEI/DNA complexes. J Pharm Sci 2003; 92:1710-22. [PMID: 12884257 DOI: 10.1002/jps.10437] [Citation(s) in RCA: 199] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The main goal of this study was to determine the effects of polyethylenimine (PEI) molecular weight and structure (750 kDa, 25 kDa, 2 kDa branched, and 25 kDa linear PEI) and the nitrogen/phosphate (N/P) molar ratio on the physical properties and transfection efficiencies of PEI/DNA complexes. Fourier transform infrared spectroscopy revealed that DNA remained in the B conformation when complexed to all PEIs. Unique alterations in the circular dichroism spectra of DNA were observed in the presence of each PEI, whereas differential scanning calorimetry measurements showed that all PEIs examined destabilized supercoiled DNA at N/P < 3/1, but not at higher ratios. Isothermal titration calorimetry revealed the existence of protonation changes at low ionic strength due to possible shifts in pK(a) of the ionizable groups of PEI during complex formation. Twenty-five kilodalton branched and 25 kDa linear PEI complexes showed the highest transfection efficiencies at an N/P ratio of 6:1 in COS-7 and CHO-K1 cells, respectively. These investigations have detected alterations in the physical and colloidal properties of the complexes that were sensitive to polymer structure, molecular weight, and polymer/DNA ratio, but these properties did not directly correlate with their transfection efficiencies. To further probe any possible relationship between these parameters and activity, a more refined biophysical analysis of any subpopulations in these samples that may differ in transfection activity is suggested, although the existence of such species remains unknown.
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Affiliation(s)
- Sirirat Choosakoonkriang
- The Department of Pharmaceutical Chemistry, The University of Kansas, 2095 Constant Avenue, Lawrence, Kansas 66047, USA
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