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Rinaldi F, Forte J, Pontecorvi G, Hanieh PN, Carè A, Bellenghi M, Tirelli V, Ammendolia MG, Mattia G, Marianecci C, Puglisi R, Carafa M. pH-responsive oleic acid based nanocarriers: Melanoma treatment strategies. Int J Pharm 2021; 613:121391. [PMID: 34923052 DOI: 10.1016/j.ijpharm.2021.121391] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/02/2021] [Accepted: 12/13/2021] [Indexed: 12/18/2022]
Abstract
Numerous clinical observations indicate that, despite novel therapeutic approaches, a high percentage of melanoma patients is non-responder or suffers of severe drug-related toxicity. To overcome these problems, we considered the option of designing, preparing and characterizing nanoemulsions and niosomes containing oleic acid, a pH-sensitive monounsaturated fatty acid holding per se an antimetastatic and anti-inflammatory role in melanoma. These new nanostructures will allow in vivo administration of oleic acid, otherwise toxic in its free form. For pulmonary route chitosan, a mucoadhesive agent, was enclosed in these nanocarriers to improve residence time at the lung site. A deep physical and chemical characterization was carried out evaluating size, ζ -potential, microviscosity, polarity as well as stability over time and in culture media. Moreover, their pH-sensitivity was evaluated by fluorometric assay. Cytotoxicity and cellular uptake were assessed in cultured normal fibroblasts and human melanoma cell lines. Interestingly, results obtained confirm nanocarrier stability and pH-sensitivity, associated to absence of cell toxicity, efficient cellular uptake and retention. Therefore, these new pH-sensitive oleic acid-based nanostructures could represent, by combining drug delivery in a pH-dependent manner with the antimetastatic potential of this fatty acid, a powerful strategy for more specific medicine against metastatic melanoma.
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Affiliation(s)
- Federica Rinaldi
- Department of Drug Chemistry and Technology, Sapienza University of Rome, Rome, Italy.
| | - Jacopo Forte
- Department of Drug Chemistry and Technology, Sapienza University of Rome, Rome, Italy.
| | - Giada Pontecorvi
- Center for Gender-specific Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy.
| | - Patrizia Nadia Hanieh
- Department of Drug Chemistry and Technology, Sapienza University of Rome, Rome, Italy.
| | - Alessandra Carè
- Center for Gender-specific Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy.
| | - Maria Bellenghi
- Center for Gender-specific Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy.
| | | | - Maria Grazia Ammendolia
- National Center of Innovative Technologies in Public Health, Istituto Superiore di Sanità, Rome, Italy.
| | - Gianfranco Mattia
- Center for Gender-specific Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy.
| | - Carlotta Marianecci
- Department of Drug Chemistry and Technology, Sapienza University of Rome, Rome, Italy.
| | - Rossella Puglisi
- Center for Gender-specific Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy.
| | - Maria Carafa
- Department of Drug Chemistry and Technology, Sapienza University of Rome, Rome, Italy.
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2
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Oliveira ACN, Fernandes J, Gonçalves A, Gomes AC, Oliveira MECDR. Lipid-based Nanocarriers for siRNA Delivery: Challenges, Strategies and the Lessons Learned from the DODAX: MO Liposomal System. Curr Drug Targets 2020; 20:29-50. [PMID: 29968536 DOI: 10.2174/1389450119666180703145410] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 04/24/2018] [Accepted: 06/28/2018] [Indexed: 12/19/2022]
Abstract
The possibility of using the RNA interference (RNAi) mechanisms in gene therapy was one of the scientific breakthroughs of the last century. Despite the extraordinary therapeutic potential of this approach, the need for an efficient gene carrier is hampering the translation of the RNAi technology to the clinical setting. Although a diversity of nanocarriers has been described, liposomes continue to be one of the most attractive siRNA vehicles due to their relatively low toxicity, facilitated siRNA complexation, high transfection efficiency and enhanced pharmacokinetic properties. This review focuses on RNAi as a therapeutic approach, the challenges to its application, namely the nucleic acids' delivery process, and current strategies to improve therapeutic efficacy. Additionally, lipid-based nanocarriers are described, and lessons learned from the relation between biophysical properties and biological performance of the dioctadecyldimethylammonium:monoolein (DODAX: MO) system are explored. Liposomes show great potential as siRNA delivery systems, being safe nanocarriers to protect nucleic acids in circulation, extend their half-life time, target specific cells and reduce off-target effects. Nevertheless, several issues related to delivery must be overcome before RNAi therapies reach their full potential, namely target-cell specificity and endosomal escape. Understanding the relationship between biophysical properties and biological performance is an essential step in the gene therapy field.
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Affiliation(s)
- Ana C N Oliveira
- CBMA (Center of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal.,CFUM (Center of Physics), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - Joana Fernandes
- CBMA (Center of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - Anabela Gonçalves
- CBMA (Center of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - Andreia C Gomes
- CBMA (Center of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - M E C D Real Oliveira
- CFUM (Center of Physics), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
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3
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Di Francesco M, Celia C, Primavera R, D’Avanzo N, Locatelli M, Fresta M, Cilurzo F, Ventura CA, Paolino D, Di Marzio L. Physicochemical characterization of pH-responsive and fusogenic self-assembled non-phospholipid vesicles for a potential multiple targeting therapy. Int J Pharm 2017; 528:18-32. [DOI: 10.1016/j.ijpharm.2017.05.055] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 05/22/2017] [Accepted: 05/23/2017] [Indexed: 12/15/2022]
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4
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Martinez V, Henary M. Nile Red and Nile Blue: Applications and Syntheses of Structural Analogues. Chemistry 2016; 22:13764-13782. [DOI: 10.1002/chem.201601570] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Vincent Martinez
- Department of Chemistry; Georgia State University; Atlanta GA 30302 USA
| | - Maged Henary
- Department of Chemistry; Georgia State University; Atlanta GA 30302 USA
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5
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Kuo AT, Chang CH. Elucidating the Effects of Cholesterol on the Molecular Packing of Double-chained Cationic Lipid Langmuir Monolayers by Infrared Reflection-absorption Spectroscopy. J Oleo Sci 2015; 64:455-65. [DOI: 10.5650/jos.ess14266] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- An-Tsung Kuo
- Department of Chemical Engineering, National Cheng Kung University
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6
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Silva JPN, Oliveira IMSC, Oliveira ACN, Lúcio M, Gomes AC, Coutinho PJG, Oliveira MECDR. Structural dynamics and physicochemical properties of pDNA/DODAB:MO lipoplexes: effect of pH and anionic lipids in inverted non-lamellar phases versus lamellar phases. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2555-67. [PMID: 24976292 DOI: 10.1016/j.bbamem.2014.06.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 06/17/2014] [Accepted: 06/18/2014] [Indexed: 11/19/2022]
Abstract
Dioctadecyldimethylammonium bromide (DODAB):Monoolein (MO) lipoplexes have mainly been studied within the range of high molar ratios of DODAB, with noticeable transfection efficiencies in the Human Embryonic Kidney (HEK, a.k.a. 293T) cell line. In this work, we intend to study the effect of high MO content on the structure and physicochemical properties of pDNA/DODAB:MO lipoplexes to achieve some correlation with their transfection efficiency. Static/Dynamic Light Scattering and Cryo-TEM imaging were used to characterize the size/morphology of DNA/DODAB:MO lipoplexes at different DODAB:MO contents (2:1, 1:1, 1:2) and charge ratios (CRs) (+/-). Nile Red fluorescence emission was performed to detect changes in microviscosity, hydration and polarity of DNA/DODAB:MO systems. Lipoplexes stability at physiological pH values and in the presence of anionic lipids was evaluated by Förster Resonance Energy Transfer (FRET). Physicochemical/structural data were complemented with transfection studies in HEK cells using the β-galactosidase reporter gene activity assay. This work reports the coexistence of multilamellar and non-lamellar inverted phases in MO-richer lipoplexes (DODAB:MO 1:2 and 1:4), leading to transfection efficiencies comparable to those of multilamellar (DODAB-richer) lipoplexes, but at higher charge ratios [CR (+/-)=6.0] and without dose-effect response. These results may be related to the structural changes of lipoplexes promoted by high MO content.
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Affiliation(s)
- J P Neves Silva
- CFUM (Centre of Physics of the University of Minho), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - I M S C Oliveira
- CFUM (Centre of Physics of the University of Minho), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - A C N Oliveira
- CFUM (Centre of Physics of the University of Minho), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - M Lúcio
- CFUM (Centre of Physics of the University of Minho), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - A C Gomes
- CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - P J G Coutinho
- CFUM (Centre of Physics of the University of Minho), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - M E C D Real Oliveira
- CFUM (Centre of Physics of the University of Minho), Department of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal.
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7
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Oliveira ACN, Martens TF, Raemdonck K, Adati RD, Feitosa E, Botelho C, Gomes AC, Braeckmans K, Real Oliveira MECD. Dioctadecyldimethylammonium:monoolein nanocarriers for efficient in vitro gene silencing. ACS APPLIED MATERIALS & INTERFACES 2014; 6:6977-6989. [PMID: 24712543 DOI: 10.1021/am500793y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This study describes a novel liposomal formulation for siRNA delivery, based on the mixture of the neutral lipid monoolein (MO) and cationic lipids of the dioctadecyldimethylammonium (DODA) family. The cationic lipids dioctadecyldimethylammonium bromide (DODAB) and chloride (DODAC) were compared in order to identify which one will most efficiently induce gene silencing. MO has a fluidizing effect on DODAC and DODAB liposomes, although it was more homogeneously distributed in DODAC bilayers. All MO-based liposomal formulations were able to efficiently encapsulate siRNA. Stable lipoplexes of small size (100-160 nm) with a positive surface charge (>+45 mV) were formed. A more uniform MO incorporation in DODAC:MO may explain an increase of the fusogenic potential of these liposomes. The siRNA-lipoplexes were readily internalized by human nonsmall cell lung carcinoma (H1299) cells, in an energy dependent process. DODAB:MO nanocarriers showed a higher internalization efficiency in comparison to DODAC:MO lipoplexes, and were also more efficient in promoting gene silencing. MO had a similar gene silencing ability as the commonly used helper lipid 1,2-dioleyl-3-phosphatidylethanolamine (DOPE), but with much lower cytotoxicity. Taking in consideration all the results presented, DODAB:MO liposomes are the most promising tested formulation for systemic siRNA delivery.
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Affiliation(s)
- Ana Cristina Norberto Oliveira
- CBMA (Center of Molecular and Environmental Biology), Department of Biology and ‡CFUM (Center of Physics), Department of Physics, University of Minho , Campus of Gualtar, 4710-057 Braga, Portugal
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8
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Li W, Yang Y, Luo T, Zhang J, Han B. CO2-induced micelle to vesicle transition in zwitterionic–anionic surfactant systems. Phys Chem Chem Phys 2014; 16:3640-7. [DOI: 10.1039/c3cp54537g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Marianecci C, Rinaldi F, Di Marzio L, Pozzi D, Caracciolo G, Manno D, Dini L, Paolino D, Celia C, Carafa M. Interaction of pH-sensitive non-phospholipid liposomes with cellular mimetic membranes. Biomed Microdevices 2013; 15:299-309. [PMID: 23239124 DOI: 10.1007/s10544-012-9731-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Surfactant nanocarriers have received considerable attention in the last several years as interesting alternative to classic liposomes. Different pH-sensitive vesicular colloidal carriers based on Tween 20 derivatives, obtained after functionalization of the head groups of the surfactant with natural, or simply modified, amino acids, were proposed as drug nanocarriers. Dynamic light scattering, Small Angle X-ray Scattering, Trasmission Electron Microscopy and fluorescence studies were used for the physico-chemical characterization of vesicles and mean size, size distribution, zeta potential, vesicle morphology and bilayer properties were evaluated. The pH-sensitivity and the stability of formulations, in absence and in presence of foetal bovine serum, were also evaluated. Moreover, the contact between surfactant vesicles and liposomes designed to model the cellular membrane was investigated by fluorescence studies to preliminary explore the potential interaction between vesicle and cell membranes. Experimental findings showed that physico-chemical and technological features of pH-sensitive vesicles were influenced by the composition of the carriers. Furthermore, proposed carriers are able to interact with mimetic cell membrane and it is reasonable to attribute the observed differences in interaction to the architectural/structural properties of Tween 20 derivatives. The findings reported in this investigation showed that a deep and extensive physico-chemical characterization of the carrier is a fundamental step, according to the evidence that the knowledge of nanocarrier properties is necessary to translate its potentiality to in vitro/in vivo applications.
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Affiliation(s)
- Carlotta Marianecci
- Department of Drug Chemistry and Technologies, University of Rome "Sapienza", Rome, Italy
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10
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Naik S, Alves CMA, Coutinho PJG, Gonçalves MST. N-(Di)icosyl-Substituted Benzo[a]phenoxazinium Chlorides: Synthesis and Evaluation as Near-Infrared Membrane Probes. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001579] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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11
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Di Marzio L, Marianecci C, Petrone M, Rinaldi F, Carafa M. Novel pH-sensitive non-ionic surfactant vesicles: comparison between Tween 21 and Tween 20. Colloids Surf B Biointerfaces 2011; 82:18-24. [DOI: 10.1016/j.colsurfb.2010.08.004] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Revised: 07/22/2010] [Accepted: 08/04/2010] [Indexed: 11/27/2022]
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12
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Li W, Zhang J, Zhao Y, Hou M, Han B, Yu C, Ye J. Reversible Switching of a Micelle-to-Vesicle Transition by Compressed CO2. Chemistry 2010; 16:1296-305. [DOI: 10.1002/chem.200902465] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Silva JN, Oliveira MR, Coutinho P. Characterization of mixed DODAB/monoolein aggregates using Nile Red as a solvatochromic and anisotropy fluorescent probe. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2008.12.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Feitosa E, Alves FR, Castanheira EMS, Oliveira MECDR. DODAB and DODAC bilayer-like aggregates in the micromolar surfactant concentration domain. Colloid Polym Sci 2009. [DOI: 10.1007/s00396-009-2008-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Coutinho PJ. Photophysics and Biophysical Applications of Benzo[a]phenoxazine Type Fluorophores. REVIEWS IN FLUORESCENCE 2009. [DOI: 10.1007/978-0-387-88722-7_14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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16
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Elegbede AI, Banerjee J, Hanson AJ, Tobwala S, Ganguli B, Wang R, Lu X, Srivastava DK, Mallik S. Mechanistic studies of the triggered release of liposomal contents by matrix metalloproteinase-9. J Am Chem Soc 2008; 130:10633-42. [PMID: 18642903 PMCID: PMC2644422 DOI: 10.1021/ja801548g] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Matrix metalloproteinases (MMPs) constitute a class of extracellular-matrix-degrading enzymes overexpressed in many cancers and contribute to the metastatic ability of the cancer cells. We have recently demonstrated that liposomal contents can be released when triggered by the enzyme MMP-9. Herein, we report the results of our mechanistic studies of the MMP-9-triggered release of liposomal contents. We synthesized peptides containing the cleavage site for MMP-9 and conjugated them with fatty acids to prepare the corresponding lipopeptides. By employing circular dichroism (CD) spectroscopy, we demonstrated that the lipopeptides, when incorporated into liposomes, are demixed in the lipid bilayers and generate triple-helical structures. MMP-9 cleaves the triple-helical peptides, leading to the release of the liposomal contents. Other MMPs, which cannot hydrolyze triple-helical peptides, fail to release the contents from the liposomes. We also observed that the rate and extent of release of the liposomal contents depend on the mismatch between the acyl chains of the synthesized lipopeptide and phospholipid components of the liposomes. CD spectroscopic studies imply that the observed differences in the release reflect the ability of the liposomal membrane to anneal the defects following the enzymatic cleavage of the liposome-incorporated lipopeptides.
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Affiliation(s)
- Adekunle I. Elegbede
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| | - Jayati Banerjee
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| | - Andrea J. Hanson
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| | - Shakila Tobwala
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58105
| | - Bratati Ganguli
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58105
| | - Rongying Wang
- Proteomics Core Facility, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota 58202
| | - Xiaoning Lu
- Proteomics Core Facility, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota 58202
| | - D. K. Srivastava
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58105
| | - Sanku Mallik
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
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17
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Di Marzio L, Marianecci C, Cinque B, Nazzarri M, Cimini AM, Cristiano L, Cifone MG, Alhaique F, Carafa M. pH-sensitive non-phospholipid vesicle and macrophage-like cells: binding, uptake and endocytotic pathway. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:2749-56. [PMID: 18762164 DOI: 10.1016/j.bbamem.2008.07.029] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2008] [Revised: 07/17/2008] [Accepted: 07/31/2008] [Indexed: 01/22/2023]
Abstract
Phospholipid and non-phospholipid vesicles are extensively studied as drug delivery systems to modify pharmacokinetics of drugs and to improve their action in target cells. It is believed that the major barrier to efficient drug delivery is entrapment of drugs in the endosomal compartment, since this eventually leads to its degradation in lysosomes. For these reasons, the knowledge of internalization pathway plays a fundamental role in optimizing drug targeting. The aim of this work is to characterize pH-sensitive Tween 20 vesicles, their interaction with macrophage-like cells and their comparison with pH-sensitive liposomes. The effect of different amounts of cholesteryl hemissucinate on surfactant vesicle formation and pH-sensitivity was studied. To evaluate the initial mode of internalization in Raw 264.7 and the intracellular fate of neutral and pH-sensitive formulations, flow cytometry in presence and in absence of selected inhibitors and fluorescence microscopy in absence and presence of specific fluorescent endocytotic markers were used. The obtained results showed that the surfactant vesicle pH-sensitivity was about two or three fold higher than that obtained with pH-sensitive liposomes in the presence of serum in vitro. The uptake mechanism of surfactant vesicles, after incubation with macrophage-like cells, is comparable to that of liposomes (clathrin-mediated endocytosis).
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Affiliation(s)
- L Di Marzio
- Department of Scienze del Farmaco, Faculty of Pharmacy, University G. D'Annunzio, Via dei Vestini, 66100 Chieti, Italy.
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18
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Alves FR, Zaniquelli MED, Loh W, Castanheira EMS, Real Oliveira MECD, Feitosa E. Vesicle–micelle transition in aqueous mixtures of the cationic dioctadecyldimethylammonium and octadecyltrimethylammonium bromide surfactants. J Colloid Interface Sci 2007; 316:132-9. [PMID: 17804006 DOI: 10.1016/j.jcis.2007.08.027] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2007] [Revised: 08/13/2007] [Accepted: 08/15/2007] [Indexed: 11/15/2022]
Abstract
The vesicle-micelle transition in aqueous mixtures of dioctadecyldimethylammonium and octadecyltrimethylammonium bromide (DODAB and C(18)TAB) cationic surfactants, having respectively double and single chain, was investigated by differential scanning calorimetry (DSC), steady-state fluorescence, dynamic light scattering (DLS) and surface tension. The experiments performed at constant total surfactant concentration, up to 1.0 mM, reveal that these homologous surfactants mix together to form mixed vesicles and/or micelles, depending on the relative amount of the surfactants. The melting temperature T(m) of the mixed DODAB-C(18)TAB vesicles is larger than that for the neat DODAB in water owing to the incorporation of C(18)TAB in the vesicle bilayer. The surface tension decreases sigmoidally with C(18)TAB concentration and the inflection point lies around x(DODAB) approximately 0.4, indicating the onset of micelle formation owing to saturation of DODAB vesicles by C(18)TAB molecules. When x(DODAB)>0.5 C(18)TAB molecules are mainly solubilised by the vesicles, but when x(DODAB)<0.25 micelles are dominant. Fluorescence data of the Nile Red probe incorporated in the system at different surfactant molar fractions indicate the formation of micelle and vesicle structures. These structures have apparent hydrodynamic radius R(H) of about 180 and 500-800 nm, respectively, as obtained by DLS measurements.
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Affiliation(s)
- Fernanda Rosa Alves
- Physics Department, São Paulo State University, IBILCE/UNESP, Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, CEP: 15054-000, Brazil
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19
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Feitosa E, Alves FR, Niemiec A, Real Oliveira MECD, Castanheira EMS, Baptista ALF. Cationic liposomes in mixed didodecyldimethylammonium bromide and dioctadecyldimethylammonium bromide aqueous dispersions studied by differential scanning calorimetry, Nile Red fluorescence, and turbidity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:3579-85. [PMID: 16584229 DOI: 10.1021/la053238f] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The thermotropic phase behavior of cationic liposomes in mixtures of two of the most investigated liposome-forming double-chain lipids, dioctadecyldimethylammonium bromide (DODAB) and didodecyldimethylammonium bromide (DDAB), was investigated by differential scanning calorimetry (DSC), turbidity, and Nile Red fluorescence. The dispersions were investigated at 1.0 mM total surfactant concentration and varying DODAB and DDAB concentrations. The gel to liquid-crystalline phase transition temperatures (Tm) of neat DDAB and DODAB in aqueous dispersions are around 16 and 43 degrees C, respectively, and we aim to investigate the Tm behavior for mixtures of these cationic lipids. Overall, DDAB reduces the Tm of DODAB, the transition temperature depending on the DDAB content, but the Tm of DDAB is roughly independent of the DODAB concentration. Both DSC and fluorescence measurements show that, within the mixture, at room temperature (ca. 22 degrees C), the DDAB-rich liposomes are in the liquid-crystalline state, whereas the DODAB-rich liposomes are in the gel state. DSC results point to a higher affinity of DDAB for DODAB liposomes than the reverse, resulting in two populations of mixed DDAB/DODAB liposomes with distinctive phase behavior. Fluorescence measurements also show that the presence of a small amount of DODAB in DDAB-rich liposomes causes a pronounced effect in Nile Red emission, due to the increase in liposome size, as inferred from turbidity results.
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Affiliation(s)
- Eloi Feitosa
- Physics Department, São Paulo State University, São José do Rio Preto, SP, Brazil.
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