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Obuobi S, Ngoc Phung A, Julin K, Johannessen M, Škalko-Basnet N. Biofilm Responsive Zwitterionic Antimicrobial Nanoparticles to Treat Cutaneous Infection. Biomacromolecules 2021; 23:303-315. [PMID: 34914360 PMCID: PMC8753600 DOI: 10.1021/acs.biomac.1c01274] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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To avert the poor
bioavailability of antibiotics during S. aureus biofilm
infections, a series of zwitterionic nanoparticles
containing nucleic acid nanostructures were fabricated for the delivery
of vancomycin. The nanoparticles were prepared with three main lipids:
(i) neutral (soy phosphatidylcholine; P), (ii) positively charged
ionizable (1,2-dioleyloxy-3-dimethylaminopropane; D), and (iii) anionic
(1,2-dipalmitoyl-sn-glycero-3-phospho((ethyl-1′,2′,3′-triazole)
triethylene glycolmannose; M) or (cholesteryl hemisuccinate; C) lipids.
The ratio of the anionic lipid was tuned between 0 and 10 mol %, and
its impact on surface charge, size, stability, toxicity, and biofilm
sensitivity was evaluated. Under biofilm mimicking conditions, the
enzyme degradability (via dynamic light scattering (DLS)), antitoxin
(via DLS and spectrophotometry), and antibiotic release profile was
assessed. Additionally, biofilm penetration, prevention (in
vitro), and eradication (ex vivo) of the
vancomycin loaded formulation was investigated. Compared with the
unmodified nanoparticles which exhibited the smallest size (188 nm),
all three surface modified formulations showed significantly larger
sizes (i.e., 222–277 nm). Under simulations of biofilm pH conditions,
the mannose modified nanoparticle (PDM 90/5/5) displayed ideal charge
reversal from a neutral (+1.69 ± 1.83 mV) to a cationic surface
potential (+17.18 ± 2.16 mV) to improve bacteria binding and
biofilm penetration. In the presence of relevant bacterial enzymes,
the carrier rapidly released the DNA nanoparticles to function as
an antitoxin against α-hemolysin. Controlled release of vancomycin
prevented biofilm attachment and significantly reduced early stage
biofilm formations within 24 h. Enhanced biocompatibility and significant ex vivo potency of the PDM 90/5/5 formulation was also observed.
Taken together, these results emphasize the benefit of these nanocarriers
as potential therapies against biofilm infections and fills the gap
for multifunctional nanocarriers that prevent biofilm infections.
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Affiliation(s)
- Sybil Obuobi
- Drug Transport and Delivery Research Group, Department of Pharmacy, UIT The Arctic University of Norway, Tromsø 9037, Norway
| | - Anna Ngoc Phung
- Drug Transport and Delivery Research Group, Department of Pharmacy, UIT The Arctic University of Norway, Tromsø 9037, Norway
| | - Kjersti Julin
- Host Microbe Interaction research group, Department of Medical Biology, UIT The Arctic University of Norway, Tromsø 9037, Norway
| | - Mona Johannessen
- Host Microbe Interaction research group, Department of Medical Biology, UIT The Arctic University of Norway, Tromsø 9037, Norway
| | - Nataša Škalko-Basnet
- Drug Transport and Delivery Research Group, Department of Pharmacy, UIT The Arctic University of Norway, Tromsø 9037, Norway
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Wu J, Chao Y, Kankala RK, Lee C, Liu C, Hu Y. Gallstone formation analysis using the particle appearance, the particle binding to calcium ions, and the cholesterol nucleation with time in supersaturated taurocholate–lecithin–calcium ion solutions. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.201900543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jhih‐Ru Wu
- Institute of Biotechnology and Department of Life Science National Dong–Hwa University Hualien Taiwan
| | - Yu‐Liang Chao
- Institute of Biotechnology and Department of Life Science National Dong–Hwa University Hualien Taiwan
| | - Ranjith Kumar Kankala
- Institute of Biotechnology and Department of Life Science National Dong–Hwa University Hualien Taiwan
- College of Chemical Engineering Huaqiao University Xiamen China
| | - Chia‐Hung Lee
- Institute of Biotechnology and Department of Life Science National Dong–Hwa University Hualien Taiwan
| | - Chen‐Lun Liu
- Institute of Biotechnology and Department of Life Science National Dong–Hwa University Hualien Taiwan
| | - Yu‐Fang Hu
- Pharmaceutical Drug Delivery Division TTY Biopharm Company Limited Taipei Taiwan
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3
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Olatunde OO, Benjakul S, Vongkamjan K, Amnuaikit T. Influence of stabilising agents on the properties of liposomal encapsulated ethanolic coconut husk extract. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14339] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Oladipupo Odunayo Olatunde
- Department of Food Technology Faculty of Agro‐Industry Prince of Songkla University Hat Yai Songkhla 90112 Thailand
| | - Soottawat Benjakul
- Department of Food Technology Faculty of Agro‐Industry Prince of Songkla University Hat Yai Songkhla 90112 Thailand
| | - Kitiya Vongkamjan
- Department of Food Technology Faculty of Agro‐Industry Prince of Songkla University Hat Yai Songkhla 90112 Thailand
| | - Thanaporn Amnuaikit
- Department of Pharmaceutical Technology Faculty of Pharmaceutical Sciences Prince of Songkla University Hat Yai Songkhla 90112 Thailand
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4
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Luque-Caballero G, Maldonado-Valderrama J, Quesada-Pérez M, Martín-Molina A. Interaction of DNA with likely-charged lipid monolayers: An experimental study. Colloids Surf B Biointerfaces 2019; 178:170-176. [PMID: 30856586 DOI: 10.1016/j.colsurfb.2019.02.058] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 02/27/2019] [Accepted: 02/28/2019] [Indexed: 12/31/2022]
Abstract
Anionic lipids are increasingly being used in lipoplexes for synthetic gene vectors as an alternative to cationic lipids. This is primarily due to their lower toxicity, which makes them biocompatible and adaptable to be tissue specific. However, anionic lipoplexes require the presence of multivalent cations to promote the electrostatic attraction between DNA and anionic lipid mono- and bilayers. In this work we provide for the first time experimental results of the adsorption of linear DNA onto anionic/zwitterionic lipid monolayers without any addition of cations. This is demonstrated experimentally by means of Langmuir monolayers of DOPE/DOPG (1:1) lipids spread on a water subphase that contains calf thymus DNA. The adsorption of DNA onto anionic/zwitterionic lipid monolayers is discussed in terms of the surface pressure-molecular area isotherms recorded in the absence and in the presence of different electrolytes. Measurements of the surface potential provide additional evidence of the different interaction of DNA anionic/zwitterionic lipid monolayers depending on the presence and nature of electrolyte. These experimental results are further analysed in terms of the overall dipole moment normal to the monolayers providing new insight into the behaviour of anionic lipoplexes and the role of zwitterionic lipids.
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Affiliation(s)
- German Luque-Caballero
- Departamento de Física Aplicada, Universidad de Granada, Campus de Fuentenueva sn, 18071, Granada, Spain
| | - Julia Maldonado-Valderrama
- Departamento de Física Aplicada, Universidad de Granada, Campus de Fuentenueva sn, 18071, Granada, Spain; Unidad de excelencia "Modelling Nature" (MNat), Universidad de Granada, Spain
| | - Manuel Quesada-Pérez
- Departamento de Física, Escuela Politécnica Superior de Linares, Universidad de Jaén, 23700, Linares, Jaén, Spain
| | - Alberto Martín-Molina
- Departamento de Física Aplicada, Universidad de Granada, Campus de Fuentenueva sn, 18071, Granada, Spain; Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, Spain.
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5
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Danaei M, Kalantari M, Raji M, Samareh Fekri H, Saber R, Asnani G, Mortazavi S, Mozafari M, Rasti B, Taheriazam A. Probing nanoliposomes using single particle analytical techniques: effect of excipients, solvents, phase transition and zeta potential. Heliyon 2018; 4:e01088. [PMID: 30603716 PMCID: PMC6307095 DOI: 10.1016/j.heliyon.2018.e01088] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 12/05/2018] [Accepted: 12/20/2018] [Indexed: 01/02/2023] Open
Abstract
There has been a steady increase in the interest towards employing nanoliposomes as colloidal drug delivery systems, particularly in the last few years. Their biocompatibility nature along with the possibility of encapsulation of lipid-soluble, water-soluble and amphipathic molecules and compounds are among the advantages of employing these lipidic nanocarriers. A challenge in the successful formulation of nanoliposomal systems is to control the critical physicochemical properties, which impact their in vivo performance, and validating analytical techniques that can adequately characterize these nanostructures. Of particular interest are the chemical composition of nanoliposomes, their phase transition temperature, state of the encapsulated material, encapsulation efficiency, particle size distribution, morphology, internal structure, lamellarity, surface charge, and drug release pattern. These attributes are highly important in revealing the supramolecular arrangement of nanoliposomes and incorporated drugs and ensuring the stability of the formulation as well as consistent drug delivery to target tissues. In this article, we present characterization of nanoliposomal formulations as an example to illustrate identification of key in vitro characteristics of a typical nanotherapeutic agent. Corresponding analytical techniques are discussed within the context of nanoliposome assessment, single particle analysis and ensuring uniform manufacture of therapeutic formulations with batch-to-batch consistency.
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Affiliation(s)
- M. Danaei
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - M. Kalantari
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - M. Raji
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - H. Samareh Fekri
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - R. Saber
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - G.P. Asnani
- Sinhgad Technical Education Society's, Smt. Kashibai Navale College of Pharmacy, Kondhwa, Pune 411 048, (Savitribai Phule Pune University), Maharashtra, India
| | - S.M. Mortazavi
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - M.R. Mozafari
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
| | - B. Rasti
- Australasian Nanoscience and Nanotechnology Initiative, 8054 Monash University LPO, Clayton, 3168 Victoria, Australia
- Faculty of Food Science and Nutrition, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - A. Taheriazam
- Department of Orthopaedics, Tehran Medical Sciences Branch IAU, Azad University, 19168 93813 Tehran, Iran
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6
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Martín-Molina A, Luque-Caballero G, Faraudo J, Quesada-Pérez M, Maldonado-Valderrama J. Adsorption of DNA onto anionic lipid surfaces. Adv Colloid Interface Sci 2014; 206:172-85. [PMID: 24359695 DOI: 10.1016/j.cis.2013.11.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 10/16/2013] [Accepted: 11/11/2013] [Indexed: 01/05/2023]
Abstract
Currently self-assembled DNA delivery systems composed of DNA multivalent cations and anionic lipids are considered to be promising tools for gene therapy. These systems become an alternative to traditional cationic lipid-DNA complexes because of their low cytotoxicity lipids. However, currently these nonviral gene delivery methods exhibit low transfection efficiencies. This feature is in large part due to the poorly understood DNA complexation mechanisms at the molecular level. It is well-known that the adsorption of DNA onto like charged lipid surfaces requires the presence of multivalent cations that act as bridges between DNA and anionic lipids. Unfortunately, the molecular mechanisms behind such adsorption phenomenon still remain unclear. Accordingly a historical background of experimental evidence related to adsorption and complexation of DNA onto anionic lipid surfaces mediated by different multivalent cations is firstly reviewed. Next, recent experiments aimed to characterise the interfacial adsorption of DNA onto a model anionic phospholipid monolayer mediated by Ca(2+) (including AFM images) are discussed. Afterwards, modelling studies of DNA adsorption onto charged surfaces are summarised before presenting preliminary results obtained from both CG and all-atomic MD computer simulations. Our results allow us to establish the optimal conditions for cation-mediated adsorption of DNA onto negatively charged surfaces. Moreover, atomistic simulations provide an excellent framework to understand the interaction between DNA and anionic lipids in the presence of divalent cations. Accordingly,our simulation results in conjunction go beyond the macroscopic picture in which DNA is stuck to anionic membranes by using multivalent cations that form glue layers between them. Structural aspects of the DNA adsorption and molecular binding between the different charged groups from DNA and lipids in the presence of divalent cations are reported in the last part of the study. Although this research work is far from biomedical applications, we truly believe that scientific advances in this line will assist, at least in part, in the rational design and development of optimal carrier systems for genes and applicable to other drugs.
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7
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Carvalho MSD, Hortelão AC, Calhelha RC, Abreu AS, Coutinho PJ, Queiroz MJR, Castanheira EM. Fluorescence studies on potential antitumor 6-(hetero)arylthieno[3,2-b]pyridine derivatives in solution and in nanoliposomes. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.04.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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8
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Queiroz MJR, Dias S, Peixoto D, Rodrigues ARO, Oliveira AD, Coutinho PJ, Vale-Silva LA, Pinto E, Castanheira EM. New potential antitumoral di(hetero)arylether derivatives in the thieno[3,2-b]pyridine series: Synthesis and fluorescence studies in solution and in nanoliposomes. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.04.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Abreu AS, Castanheira EMS, Queiroz MJRP, Ferreira PMT, Vale-Silva LA, Pinto E. Nanoliposomes for encapsulation and delivery of the potential antitumoral methyl 6-methoxy-3-(4-methoxyphenyl)-1H-indole-2-carboxylate. NANOSCALE RESEARCH LETTERS 2011; 6:482. [PMID: 21812989 PMCID: PMC3211996 DOI: 10.1186/1556-276x-6-482] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Accepted: 08/03/2011] [Indexed: 05/25/2023]
Abstract
A potential antitumoral fluorescent indole derivative, methyl 6-methoxy-3-(4-methoxyphenyl)-1H-indole-2-carboxylate, was evaluated for the in vitro cell growth inhibition on three human tumor cell lines, MCF-7 (breast adenocarcinoma), A375-C5 (melanoma), and NCI-H460 (non-small cell lung cancer), after a continuous exposure of 48 h, exhibiting very low GI50 values for all the cell lines tested (0.25 to 0.33 μM). This compound was encapsulated in different nanosized liposome formulations, containing egg lecithin (Egg-PC), dipalmitoyl phosphatidylcholine (DPPC), dipalmitoyl phosphatidylglycerol (DPPG), DSPC, cholesterol, dihexadecyl phosphate, and DSPE-PEG. Dynamic light scattering measurements showed that nanoliposomes with the encapsulated compound are generally monodisperse and with hydrodynamic diameters lower than 120 nm, good stability and zeta potential values lower than -18 mV. Dialysis experiments allowed to monitor compound diffusion through the lipid membrane, from DPPC/DPPG donor liposomes to NBD-labelled lipid/DPPC/DPPG acceptor liposomes.
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Affiliation(s)
- Ana S Abreu
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
- Centre of Chemistry (CQ/UM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | | | - Maria-João RP Queiroz
- Centre of Chemistry (CQ/UM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Paula MT Ferreira
- Centre of Chemistry (CQ/UM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Luís A Vale-Silva
- Laboratory of Microbiology, Faculty of Pharmacy and Centre of Medicinal Chemistry (CEQUIMED), University of Porto, Rua Aníbal Cunha 164, 4050-047 Porto, Portugal
| | - Eugénia Pinto
- Laboratory of Microbiology, Faculty of Pharmacy and Centre of Medicinal Chemistry (CEQUIMED), University of Porto, Rua Aníbal Cunha 164, 4050-047 Porto, Portugal
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10
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Mohammadabadi MR, El-Tamimy M, Gianello R, Mozafari MR. Supramolecular assemblies of zwitterionic nanoliposome-polynucleotide complexes as gene transfer vectors: Nanolipoplex formulation and in vitro characterisation. J Liposome Res 2010; 19:105-15. [PMID: 19242855 DOI: 10.1080/08982100802547326] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Synthetic gene transfer vectors based on zwitterionic nanoliposome-DNA assemblies (nanolipoplexes), formed by the mediation of magnesium ions, were prepared by a scalable method without employing volatile solvents, high-shear force treatments or extrusion. The zwitterionic nanolipoplexes (NLP) were formulated with PC (phosphatidylcholine) and DPPC (a natural lung surfactant) incorporating different amounts of cholesterol (CHOL). The resulting structures were characterised in terms of their morphology, size and DNA content. In addition, the toxicity and transfection efficiency of the nanolipoplexes were evaluated in cultured Chinese hamster ovary-K1 (CHO-K1) cells. The effects of the multivalent cation Mg(2+) on nanoliposome-DNA transfection potency were evaluated. Formulations containing 10% CHOL showed maximum transfection efficiency and the optimum amount of Mg(2+) ions for transfection with minimum cytotoxicity was ca. 20 mM. The zwitterionic formulations showed significantly less cytotoxicity compared to a commercially available cationic liposome reagent or polyethylenimine (PEI) while they were superior in terms of gene transfer potency. The zwitterionic vectors formulated in this study avoid the use of toxic cationic lipids as well as toxic solvents and may have potential application in gene therapy. The new method will enable scale-up and manufacture of safe and efficacious transfection vehicles required for preclinical and clinical studies. Based on the advantages and superiority of the formulated nanolipoplexes, this method allows for the acceleration of nanolipoplex formulation, enabling the rapid development and evaluation of novel carrier systems for genes and other drugs.
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Affiliation(s)
- M R Mohammadabadi
- Department of Animal Sciences, Faculty of Agriculture, Kerman Shahid Bahonar University, Kerman, Iran
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11
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Abstract
Nanoliposome, or submicron bilayer lipid vesicle, is a new technology for the encapsulation and delivery of bioactive agents. The list of bioactive material that can be incorporated to nanoliposomes is immense, ranging from pharmaceuticals to cosmetics and nutraceuticals. Because of their biocompatibility and biodegradability, along with their nanosize, nanoliposomes have potential applications in a vast range of fields, including nanotherapy (e.g. diagnosis, cancer therapy, gene delivery), cosmetics, food technology and agriculture. Nanoliposomes are able to enhance the performance of bioactive agents by improving their solubility and bioavailability, in vitro and in vivo stability, as well as preventing their unwanted interactions with other molecules. Another advantage of nanoliposomes is cell-specific targeting, which is a prerequisite to attain drug concentrations required for optimum therapeutic efficacy in the target site while minimising adverse effects on healthy cells and tissues. This chapter covers nanoliposomes, particularly with respect to their properties, preparation methods and analysis.
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Affiliation(s)
- M R Mozafari
- Phosphagenics R&D Laboratory, Clayton, VIC, Australia
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12
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Mozafari MR, Zareie MH, Piskin E, Hasirci V. Formation of supramolecular structures by negatively charged liposomes in the presence of nucleic acids and divalent cations. Drug Deliv 2009; 5:135-41. [DOI: 10.3109/10717549809031389] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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13
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Mozafari MR, Reed CJ, Rostron C, Hasirci V. A Review of Scanning Probe Microscopy Investigations of Liposome-DNA Complexes. J Liposome Res 2008; 15:93-107. [PMID: 16194929 DOI: 10.1081/lpr-64965] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Liposome-DNA complexes are one of the most promising systems for the protection and delivery of nucleic acids to combat neoplastic, viral, and genetic diseases. In addition, they are being used as models in the elucidation of many biological phenomena such as viral infection and transduction. In order to understand these phenomena and to realize the mechanism of nucleic acid transfer by liposome-DNA complexes, studies at the molecular level are required. To this end, scanning probe microscopy (SPM) is increasingly being used in the characterization of lipid layers, lipid aggregates, liposomes, and their complexes with nucleic acid molecules. The most attractive attributes of SPM are the potential to image samples with subnanometer spatial resolution under physiological conditions and provide information on their physical and mechanical properties. This review describes the application of scanning tunneling microscopy and atomic force microscopy, the two most commonly applied SPM techniques, in the characterisation of liposome-DNA complexes.
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Affiliation(s)
- M R Mozafari
- School of Pharmacy and Chemistry, Liverpool John Moores University, England, UK.
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14
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Mozafari MR, Reed CJ, Rostron C. Prospects of anionic nanolipoplexes in nanotherapy: Transmission electron microscopy and light scattering studies. Micron 2007; 38:787-95. [PMID: 17681472 DOI: 10.1016/j.micron.2007.06.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Currently nanosystems composed of polynucleotides and lipid vesicles (nanolipoplexes) are considered to be promising tools for gene therapeutics. Successful in vivo application of these vectors depends on their physicochemical, technological and biological characteristics including morphology, size distribution, molecular interactions and stability. Anionic nanoliposomes (DPPC:DCP:CHOL) were prepared by two different techniques, namely the conventional thin-film hydration method followed by extrusion, and the heating method (HM), in which no volatile solvent or detergent is used. A non-viral and non-cationic gene transfer vector was constructed by incorporating plasmid DNA (pcDNA3.1/His B/lacZ) to the HM-nanoliposomes by the electrostatic mediation of Ca(2+) ions. Transfection efficiency of the nanolipoplexes was evaluated using a human bronchial epithelial cell line (16HBE14o-) in the presence of serum. Particle characterisation, stability of the formulations and lipid-DNA interaction studies were performed using transmission electron microscopy (TEM) and light scattering. TEM pictures of nanolipoplexes showed presence of two to four closely packed vesicles with signs of fusion. Efficient delivery of plasmid DNA and subsequent beta-galactosidase expression was achieved using the anionic nanolipoplexes. Transfection efficiency increased with lipid:DNA ratio up to 7:1 (w/w), where transfection efficiency was 12-fold higher than in untreated cells. Further increase in lipid ratio decreased transfection. These nanolipoplexes appear to be safe, stable and efficient in the protection and delivery of DNA to different cells and tissues.
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Affiliation(s)
- M Reza Mozafari
- Riddet Centre, Massey University, Private Bag 11 222, Palmerston North, New Zealand.
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15
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Abstract
Gene therapy is a promising therapeutic strategy to combat genetic or acquired diseases at their root cause rather than just treating symptoms. It is well recognised that there is an urgent need for non-toxic and efficient gene delivery vectors to fully exploit the current potential of gene therapy in molecular medicine. Cell-specific targeting of bioactive nucleotides is a prerequisite to attain the concentration of nucleic acids required for therapeutic efficacy in the target tissue. Many metal ions such as Mg2+, Mn2+, Ba2+ and, most importantly, Ca2+ have been demonstrated to have significant roles in gene delivery. These inorganic cations show low toxicity, good biocompatibility and promise for controlled delivery properties, thus presenting a new alternative to toxic and immunogenic carriers. Recently, inorganic nanoparticles alone, or in combination with a colloidal particulate system such as nanoliposome, an advanced approach to gene delivery, were found to exert a positive effect on gene transfer. In this report, the role of the divalent cations in nucleic acid delivery, particularly with respect to the potential improvement of transfection efficiency of nanolipoplexes, is reviewed.
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Affiliation(s)
- M Reza Mozafari
- Riddet Centre, Private Bag 11-222, Massey University, Palmerston North, New Zealand
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16
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Khosravi-Darani K, Pardakhty A, Honarpisheh H, Rao VM, Mozafari MR. The role of high-resolution imaging in the evaluation of nanosystems for bioactive encapsulation and targeted nanotherapy. Micron 2007; 38:804-18. [PMID: 17669661 PMCID: PMC7126426 DOI: 10.1016/j.micron.2007.06.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nanotechnology has already started to significantly impact many industries and scientific fields including biotechnology, pharmaceutics, food technology and semiconductors. Nanotechnology-based tools and devices, including high-resolution imaging techniques, enable characterization and manipulation of materials at the nanolevel and further elucidate nanoscale phenomena and equip us with the ability to fabricate novel materials and structures. One of the most promising impacts of nanotechnology is in the area of nanotherapy. Employing nanosystems such as dendrimers, nanoliposomes, niosomes, nanotubes, emulsions and quantum dots, nanotherapy leads toward the concept of personalized medicine and the potential for early diagnoses coupled with efficient targeted therapy. The development of smart targeted nanocarriers that can deliver bioactives at a controlled rate directly to the designated cells and tissues will provide better efficacy and reduced side effects. Nanocarriers improve the solubility of bioactives and allow for the delivery of not only small-molecule drugs but also the delivery of nucleic acids and proteins. This review will focus on nanoscale bioactive delivery and targeting mechanisms and the role of high-resolution imaging techniques in the evaluation and development of nanocarriers.
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Affiliation(s)
- Kianoush Khosravi-Darani
- Department of Food Technology Research, National Nutrition and Food Technology Research Institute, Shaheed Beheshti Medical University, P.O. Box 19395-4741, Tehran, Iran
| | - Abbas Pardakhty
- Department of Pharmaceutics, School of Pharmacy and Pharmaceutical Sciences, Kerman University of Medical Sciences, P.O. Box 76175-493, Kerman, Iran
| | - Hamid Honarpisheh
- Deputy of Education, Iranian Council of General Medical Education Secretariat, Ministry of Health and Medical Education, Ghods Town, Tehran, Iran
| | | | - M. Reza Mozafari
- Riddet Centre, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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17
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Mortazavi SM, Mohammadabadi MR, Khosravi-Darani K, Mozafari MR. Preparation of liposomal gene therapy vectors by a scalable method without using volatile solvents or detergents. J Biotechnol 2007; 129:604-13. [PMID: 17353061 DOI: 10.1016/j.jbiotec.2007.02.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2006] [Revised: 01/24/2007] [Accepted: 02/07/2007] [Indexed: 11/27/2022]
Abstract
A scalable and safe method was developed to prepare liposomal carriers for entrapment and delivery of genetic material. The carrier systems were composed of endogenously occurring dipalmitoylphosphatidylcholine (DPPC), negatively charged dicetylphosphate (DCP), cholesterol (CHOL) and glycerol (3%, v/v). Liposomes were prepared by a modified and improved version of the heating method in which no harmful chemical or procedure is involved. Anionic lipoplexes were formed by incorporating plasmid DNA (pCMV-GFP) to the liposomes by the mediation of calcium ions. Transfection efficiency and toxicity of the lipoplexes were evaluated in CHO-K1 cells using flow cytometry and MTT assay, respectively. Controls included DNA-Ca(2+) complexes (without lipids), anionic liposome-DNA complexes (with no Ca(2+)), and a commercially available cationic liposomal formulation. Results indicated fast and reproducible formation of non-toxic lipoplexes that possess long-term stability, high DNA entrapment capacity (81%) and high transfection efficiency. The lipoplex preparation method has the potential of large-scale manufacture of safe and efficient carriers of nucleic acid drugs.
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Affiliation(s)
- S Moazam Mortazavi
- Biochemistry Group, Medical School of Sanandaj, Faculty of Medicine, Kurdestan University, Sanandaj, Kurdestan, Iran
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Kulkarni VI, Shenoy VS, Dodiya SS, Rajyaguru TH, Murthy RR. Role of calcium in gene delivery. Expert Opin Drug Deliv 2006; 3:235-45. [PMID: 16506950 DOI: 10.1517/17425247.3.2.235] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The treatment of genetic diseases using therapeutic gene transfer is considered to be a significant development. This development has brought with it certain limitations, and the process of overcoming these barriers has seen a drastic change in gene delivery. Many metal ions such as Mg2+, Mn2+, Ba2+ and, most importantly, Ca2+ have been demonstrated to have significant roles in gene delivery. Recently, calcium phosphate alone, or in combination with viral and nonviral vectors, was found to exert a positive effect on gene transfer when incorporated in the colloidal particulate system, which is an advancing approach to gene delivery. This review elaborates on various successful methods of using calcium in gene delivery.
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Affiliation(s)
- Vijay I Kulkarni
- Centre for Postgraduate Studies and Research, New Drug Delivery Systems laboratory, Pharmacy Department, Donors Plaza, MS University of Baroda, Fatehgunj, Vadodara - 390 002, India.
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Fillion P, Desjardins A, Sayasith K, Lagacé J. Encapsulation of DNA in negatively charged liposomes and inhibition of bacterial gene expression with fluid liposome-encapsulated antisense oligonucleotides. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1515:44-54. [PMID: 11597351 DOI: 10.1016/s0005-2736(01)00392-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Antisense therapy for the treatment of bacterial infections is a very attractive alternative to overcome drug resistance problems. However, the penetration of antisense oligonucleotides into bacterial cells is a major huddle that has delayed research and application in this field. In the first part of this study, we defined efficient conditions to encapsulate plasmid DNA and antisense oligonucleotides in a fluid negatively charged liposome. Subsequently, we evaluated the potential of liposome-encapsulated antisense oligonucleotides to penetrate the bacterial outer membrane and to inhibit gene expression in bacteria. It was found that 48.9+/-12% and 43.5+/-4% of the purified plasmid DNA and antisense oligonucleotides were respectively encapsulated in the liposomes. Using fluorescence-activated cell sorting analysis, it was shown, after subtraction of the fluorescence values due to the aggregation phenomenon measured at 4 degrees C, that about 57% of bacterial cells had integrated the encapsulated antisense oligonucleotides whereas values for free antisenses were negligible. The uptake of the encapsulated anti-lacZ antisense oligonucleotides resulted in a 42% reduction of beta-galactosidase compared to 9% and 6% for the encapsulated mismatch antisense oligonucleotides and the free antisense oligonucleotides respectively. This work shows that it is possible to encapsulate relatively large quantities of negatively charged molecules in negative fluid liposomes and suggests that fluid liposomes could be used to deliver nucleic acids in bacteria to inhibit essential bacterial genes.
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Affiliation(s)
- P Fillion
- Department of Microbiology and Immunology, Faculty of Medicine, University of Montreal, C.P.6128, Succ. Centre-Ville, H3T 3J7, Montreal, QC, Canada
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Bailey AL, Sullivan SM. Efficient encapsulation of DNA plasmids in small neutral liposomes induced by ethanol and calcium. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1468:239-52. [PMID: 11018668 DOI: 10.1016/s0005-2736(00)00264-9] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Efficient encapsulation of DNA plasmids inside small, neutral liposomes composed of 1,2-dioleoyl-sn-phosphatidylcholine (DOPC), DOPC/DOPE (1,2-dioleoyl-sn-phosphatidylethanolamine) (1:1) and DOPC/DOPE/cholesterol (1:1:1) was achieved by the addition of ethanol and calcium chloride to an aqueous mixture of small unilamellar vesicles (SUVs) and plasmid. Following dialysis against low-salt buffer, the neutral lipid complexes (NLCs) had average effective diameters less than 200 nm and encapsulated up to 80% of the DNA. Optimum Ca(2+) and ethanol concentrations for each lipid mixture were determined by statistically designed experiments and mathematical modeling of trapping efficiency. NLCs are unilamellar, have neutral surface potentials, and retain entrapped DNA at pH 4.0 and in serum at 37 degrees C. The circulation and clearance properties of the complexes following intravenous administration in mice are similar to empty neutral liposomes, and the toxicity of NLCs are expected to be significantly reduced compared to other non-viral gene-delivery systems. The NLC encapsulation method, if it can be combined with effective targeting and endosome-release technologies to achieve efficient and tissue-specific transfection, may represent an important alternative to current systemic gene therapy approaches.
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Affiliation(s)
- A L Bailey
- Valentis, Inc., 8301 New Trails Drive, 77381-4248, The Woodlands, TX, USA.
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Kharakoz DP, Khusainova RS, Gorelov AV, Dawson KA. Stoichiometry of dipalmitoylphosphatidylcholine-DNA interaction in the presence of Ca2+: a temperature-scanning ultrasonic study. FEBS Lett 1999; 446:27-9. [PMID: 10100608 DOI: 10.1016/s0014-5793(99)00165-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
DNA-DPPC complexes can be prepared by means of a single step procedure of mixing DNA solution and aqueous lipid dispersion in the presence of calcium ions. Interaction between DPPC and DNA brings about a biphasic shape of melting curves corresponding to the free lipid and the strongly bound one. The amount of the strongly bound lipid is 5 molecules per nucleotide which is close to the size of the first lipid monolayer around DNA molecule.
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Affiliation(s)
- D P Kharakoz
- Institute of Theoretical and Experimental Biophysics, Pushchino, Russia.
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