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Agallou M, Margaroni M, Tsanaktsidou E, Badounas F, Kammona O, Kiparissides C, Karagouni E. A liposomal vaccine promotes strong adaptive immune responses via dendritic cell activation in draining lymph nodes. J Control Release 2023; 356:386-401. [PMID: 36893900 DOI: 10.1016/j.jconrel.2023.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 02/14/2023] [Accepted: 03/03/2023] [Indexed: 03/11/2023]
Abstract
Subunit proteins provide a safe source of antigens for vaccine development especially for intracellular infections which require the induction of strong cellular immune responses. However, those antigens are often limited by their low immunogenicity. In order to achieve effective immune responses, they should be encapsulated into a stable antigen delivery system combined with an appropriate adjuvant. As such cationic liposomes provide an efficient platform for antigen delivery. In the present study, we describe a liposomal vaccine platform for co-delivery of antigens and adjuvants able to elicit strong antigen-specific adaptive immune responses. Liposomes are composed of the cationic lipid dimethyl dioctadecylammonium bromide (DDAB), cholesterol (CHOL) and oleic acid (OA). Physicochemical characterization of the formulations showed that their size was in the range of ∼250 nm with a positive zeta potential which was affected in some cases by the enviromental pH facilitating endosomal escape of potential vaccine cargo. In vitro, liposomes were effectively taken up by bone marrow dendritic cells (BMDCs) and when encapsulated IMQ they promoted BMDCs maturation and activation. Upon in vivo intramuscular administration, liposomes' active drainage to lymph nodes was mediated by DCs, B cells and macrophages. Thus, mice immunization with liposomes having encapsulated LiChimera, a previously characterized anti-leishmanial antigen, and IMQ elicited infiltration of CD11blow DCs populations in draining LNs followed by increased antigen-specific IgG, IgG2a and IgG1 levels production as well as indcution of antigen-specific CD4+ and CD8+ T cells. Collectively, the present work provides a proof-of-concept that cationic liposomes composed of DDAB, CHOL and OA adjuvanted with IMQ provide an efficient delivery platform for protein antigens able to induce strong adaptive immune responses via DCs targeting and induction of maturation.
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Affiliation(s)
- Maria Agallou
- Immunology of Infection Laboratory, Hellenic Pasteur Institute, Athens 125 21, Greece
| | - Maritsa Margaroni
- Immunology of Infection Laboratory, Hellenic Pasteur Institute, Athens 125 21, Greece
| | - Evgenia Tsanaktsidou
- Chemical Process & Energy Resources Institute, Centre for Research and Technology Hellas, P.O. Box 60361, Thessaloniki 57 001, Greece
| | - Fotis Badounas
- Molecular Genetics Laboratory, Department of Immunology, Transgenic Technology Laboratory, Hellenic Pasteur Institute, Athens 125 21, Greece
| | - Olga Kammona
- Chemical Process & Energy Resources Institute, Centre for Research and Technology Hellas, P.O. Box 60361, Thessaloniki 57 001, Greece
| | - Costas Kiparissides
- Chemical Process & Energy Resources Institute, Centre for Research and Technology Hellas, P.O. Box 60361, Thessaloniki 57 001, Greece; Department of Chemical Engineering, Aristotle University of Thessaloniki, P.O. Box 472, Thessaloniki 54 124, Greece
| | - Evdokia Karagouni
- Immunology of Infection Laboratory, Hellenic Pasteur Institute, Athens 125 21, Greece.
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Baccile N, Le Griel P, Prévost S, Everaert B, Van Bogaert INA, Roelants S, Soetaert W. Glucosomes: Glycosylated Vesicle-in-Vesicle Aggregates in Water from pH-Responsive Microbial Glycolipid. ChemistryOpen 2017; 6:526-533. [PMID: 28794948 PMCID: PMC5542763 DOI: 10.1002/open.201700101] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Indexed: 02/06/2023] Open
Abstract
Vesicle-in-vesicle self-assembled containers, or vesosomes, are promising alternatives to liposomes because of their possible hierarchical encapsulation and high stability. We report herein the first example of sugar-based vesicles-in-vesicles, which we baptize glucosomes. These were prepared by using a natural microbial glycolipid (branched C22 sophorolipid) extracted from the culture medium of the yeast Pseudohyphozyma bogoriensis. Glucosomes spontaneously formed in water between pH 6 and pH 4 at room temperature, without the requirement of any additive. By means of pH-resolved in situ small angle X-ray scattering, we provided direct evidence for the vesicle-formation mechanism. Statistical treatment of the vesicle radii distribution measured by cryo-tansmission electron microscopy by using a derived form of the Helfrich bending free-energy expression provided an order of magnitude for the effective bending constant (the sum of the curvature and the saddle-splay moduli) of the lipid membrane to K=(0.4±0.1) kBT. This value is in agreement with the bending constant measured for hydrocarbon-based vesicles membranes.
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Affiliation(s)
- Niki Baccile
- Sorbonne Universités, UPMC Univ Paris 06, CNRSCollège de France UMR 7574, Chimie de la Matière Condensée de Paris, UMR 757475005ParisFrance
| | - Patrick Le Griel
- Sorbonne Universités, UPMC Univ Paris 06, CNRSCollège de France UMR 7574, Chimie de la Matière Condensée de Paris, UMR 757475005ParisFrance
| | - Sylvain Prévost
- ESRF—The European SynchrotronHigh Brilliance Beamline ID0238043GrenobleFrance
| | - Bernd Everaert
- Bio Base Europe Pilot PlantRodenhuizekaai 19042GhentBelgium
| | - Inge N. A. Van Bogaert
- InBio, Department of Biochemical and Microbial Technology, Faculty of Bioscience EngineeringGhent University, Coupure Links 6539000GhentBelgium
| | - Sophie Roelants
- InBio, Department of Biochemical and Microbial Technology, Faculty of Bioscience EngineeringGhent University, Coupure Links 6539000GhentBelgium
- Bio Base Europe Pilot PlantRodenhuizekaai 19042GhentBelgium
| | - Wim Soetaert
- InBio, Department of Biochemical and Microbial Technology, Faculty of Bioscience EngineeringGhent University, Coupure Links 6539000GhentBelgium
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de Souza TP, Bossa GV, Stano P, Steiniger F, May S, Luisi PL, Fahr A. Vesicle aggregates as a model for primitive cellular assemblies. Phys Chem Chem Phys 2017; 19:20082-20092. [DOI: 10.1039/c7cp03751a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Primitive cell models help to understand the role that compartmentalization plays in origin of life scenarios.
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Affiliation(s)
- Tereza Pereira de Souza
- Institut für Pharmazie
- Friedrich Schiller Universität Jena
- Lessingstrasse 8
- D-07743 Jena
- Germany
| | | | - Pasquale Stano
- Science Department
- Roma Tre University
- Viale G. Marconi 446
- I-00146 Rome
- Italy
| | - Frank Steiniger
- Elektronenmikroskopisches Zentrum
- Friedrich Schiller Universität Jena
- D-07743 Jena
- Germany
| | - Sylvio May
- Department of Physics
- North Dakota State University
- Fargo North Dakota 58108-6050
- USA
| | - Pier Luigi Luisi
- Science Department
- Roma Tre University
- Viale G. Marconi 446
- I-00146 Rome
- Italy
| | - Alfred Fahr
- Institut für Pharmazie
- Friedrich Schiller Universität Jena
- Lessingstrasse 8
- D-07743 Jena
- Germany
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Bourganis V, Karamanidou T, Samaridou E, Karidi K, Kammona O, Kiparissides C. On the synthesis of mucus permeating nanocarriers. Eur J Pharm Biopharm 2015; 97:239-49. [DOI: 10.1016/j.ejpb.2015.01.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 01/23/2015] [Accepted: 01/25/2015] [Indexed: 10/24/2022]
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Paleos CM, Pantos A. Molecular recognition and organizational and polyvalent effects in vesicles induce the formation of artificial multicompartment cells as model systems of eukaryotes. Acc Chem Res 2014; 47:1475-82. [PMID: 24735049 DOI: 10.1021/ar4002679] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Researchers have become increasingly interested in the preparation and characterization of artificial cells based on amphiphilic molecules. In particular, artificial cells with multiple compartments are primitive mimics of the structure of eukaryotic cells. Endosymbiotic theory, widely accepted among biologists, states that eukaryotic cells arose from the assembly of prokaryotic cells inside other cells. Therefore, replicating this process in a synthetic system could allow researchers to model molecular and supramolecular processes that occur in living cells, shed light on mass and energy transport through cell membranes, and provide a unique, isolated space for conducting chemical reactions. In addition, such structures can serve as drug delivery systems that encapsulate both bioactive and nonbiocompatible compounds. In this Account, we present various coating, incubation, and electrofusion strategies for forming multicompartment vesicle systems, and we are focusing on strategies that rely on involving molecular recognition of complementary vesicles. All these methods afforded multicompartment systems with similar structures, and these nanoparticles have potential applications as drug delivery systems or nanoreactors for conducting diverse reactions. The complementarity of interacting vesicles allows these artificial cells to form, and the organization and polyvalency of these interacting vesicles further promote their formation. The incorporation of cholesterol in the bilayer membrane and the introduction of PEG chains at the surface of the interacting vesicles also support the structure of these multicompartment systems. PEG chains appear to destabilize the bilayers, which facilitates the fusion and transport of the small vesicles to the larger ones. Potential applications of these well-structured and reproducibly produced multicompartment systems include drug delivery, where researchers could load a cocktail of drugs within the encapsulated vesicles, a process that could enhance the bioavailability of these substances. In addition, the production of artificial cells with multiple compartments provides a platform where researchers could carry out individual reactions in small, isolated spaces. Such a reactive space can avoid problems that occur when the environment can be destructive to reactants or products or when a diverse set of compounds difficult to obtain in a conventional reactor space are produced. Our work on these artificial cells with multicompartment structures also led us to formulate a hypothesis on the processes that possibly generated eukaryotic cells. We hope both that our research efforts will excite interest in these nanoparticles and that this research could lead to systems designed for specific scientific and technological applications and further insights into the evolution of eukaryotic cells.
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Affiliation(s)
- Constantinos M. Paleos
- National Center For Scientific Research “Demokritos”, 15310 Aghia Paraskevi, Attiki, Greece
| | - A. Pantos
- National Center For Scientific Research “Demokritos”, 15310 Aghia Paraskevi, Attiki, Greece
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6
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Formation of artificial multicompartment vesosome and dendrosome as prospected drug and gene delivery carriers. J Control Release 2013; 170:141-52. [DOI: 10.1016/j.jconrel.2013.05.011] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/15/2013] [Accepted: 05/16/2013] [Indexed: 12/11/2022]
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Paleos CM, Tsiourvas D, Sideratou Z. Preparation of multicompartment lipid-based systems based on vesicle interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2337-2346. [PMID: 21988476 DOI: 10.1021/la2027187] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Various strategies for constructing artificial multicompartment vesicular systems, which primitively mimic the structure of eukaryotic cells, are presented. These model systems are appropriate for addressing several issues such as the understanding of cell processes, the development of nanoreactors and novel multicompartment delivery systems for specific drug applications, the transport through bilayer membranes, and also hypothesizing on the evolution of eukaryotic cells as originating from the symbiotic association of prokaryotes.
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Paleos CM, Tsiourvas D, Sideratou Z. Interaction of Vesicles: Adhesion, Fusion and Multicompartment Systems Formation. Chembiochem 2011; 12:510-21. [DOI: 10.1002/cbic.201000614] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Indexed: 11/06/2022]
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9
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Sideratou Z, Sterioti N, Tsiourvas D, Paleos CM. Structural Features of Interacting Complementary Liposomes Promoting Formation of Multicompartment Structures. Chemphyschem 2009; 10:3083-9. [DOI: 10.1002/cphc.200900465] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Chandrawati R, Städler B, Postma A, Connal LA, Chong SF, Zelikin AN, Caruso F. Cholesterol-mediated anchoring of enzyme-loaded liposomes within disulfide-stabilized polymer carrier capsules. Biomaterials 2009; 30:5988-98. [DOI: 10.1016/j.biomaterials.2009.07.040] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Accepted: 07/22/2009] [Indexed: 01/17/2023]
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11
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Städler B, Chandrawati R, Price AD, Chong SF, Breheney K, Postma A, Connal LA, Zelikin AN, Caruso F. A microreactor with thousands of subcompartments: enzyme-loaded liposomes within polymer capsules. Angew Chem Int Ed Engl 2009; 48:4359-62. [PMID: 19418505 DOI: 10.1002/anie.200900386] [Citation(s) in RCA: 184] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Fully loaded: Noncovalent anchoring of liposomes into polymer multilayered films with cholesterol-modified polymers allows the preparation of capsosomes-liposome-compartmentalized polymer capsules (see picture). A quantitative enzymatic reaction confirmed the presence of active cargo within the capsosomes and was used to determine the number of subcompartments within this novel biomedical carrier system.
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Affiliation(s)
- Brigitte Städler
- Centre for Nanoscience and Nanotechnology, Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
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12
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A Microreactor with Thousands of Subcompartments: Enzyme-Loaded Liposomes within Polymer Capsules. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900386] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Galanou MC, Theodossiou TA, Tsiourvas D, Sideratou Z, Paleos CM. Interactive transport, subcellular relocation and enhanced phototoxicity of hypericin encapsulated in guanidinylated liposomes via molecular recognition. Photochem Photobiol 2009; 84:1073-83. [PMID: 18627515 DOI: 10.1111/j.1751-1097.2008.00392.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Hypericin (HYP), a photocytotoxic phenanthroperylenquinone was encapsulated in liposomes outfitted with guanidinium-bearing lipids to ensure efficient cell binding through molecular recognition with anionic groups resident on the plasma membrane. The uptake of HYP encapsulated in these liposomes by DU145 human prostate cancer cells, was studied employing fluorescence, versus nonguadinylated liposomes and free HYP. The subcellular localization was in all cases studied by confocal microscopy employing specific subcellular organelle probes. The photocytotoxicity of HYP was assessed, 24 h following irradiation with 15 mWcm(-2) light through a GG 495 Schott filter, by a standard tetrazolium to formazan assay (XTT). HYP uptake by DU145 cells was found to be profoundly enhanced by using guanidinylated liposomes. Also the distance of the guanidinium group from the liposomal surface was found to significantly affect HYP loading, subcellular localization and phototoxicity. The two different modes of liposome cell internalization observed, i.e. plasma membrane fusion and endocytosis, were found to greatly affect the phototoxicity of HYP. Molecular recognition was overall appraised as a promising, novel route for photodynamic therapy, profoundly enhancing its efficacy. HYP encapsulated in liposomes-bearing guanidinium groups was more efficiently taken up by cells, leading to enhanced phototoxicity, in contrast to HYP encapsulated in their nonguanidinylated counterparts.
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Affiliation(s)
- Maria C Galanou
- Institute of Physical Chemistry, NCSR "DEMOKRITOS," Aghia Paraskevi, Attiki, Greece
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14
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Theodossiou TA, Galanou MC, Paleos CM. Novel amiodarone-doxorubicin cocktail liposomes enhance doxorubicin retention and cytotoxicity in DU145 human prostate carcinoma cells. J Med Chem 2008; 51:6067-74. [PMID: 18783209 DOI: 10.1021/jm800493j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have developed novel cocktail liposomes bearing doxorubicin in their hydrophilic cores, and amiodarone, a potent multidrug resistance inhibitor, in their lipid bilayers. The efficacy of these liposomes was studied in DU145 human prostate carcinoma cells. Intracellular calcein retention, which is inversely proportional to multidrug resistance activity, significantly increased following cell incubation with amiodarone loaded liposomes. Fluorescence confocal microscopy on cells incubated with the cocktail liposomes revealed enhanced intranuclear doxorubicin accumulation. Two liposomal drug concentration combinations were employed to assess the differential cytotoxicity of the cocktail liposomes, doxorubicin (1.4 microM)-amiodarone (15 microM) and doxorubicin 3 (microM)-amiodarone (45 microM), and two incubation times, 5 and 19 h. Cell toxicity was determined by XTT assays at 24, 48, and 72 h following incubation and was significantly enhanced for incubation with the cocktail liposomes. On the whole, we believe that these liposomes will greatly contribute to the cancer chemotherapy arena.
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Guanidinium group: A versatile moiety inducing transport and multicompartmentalization in complementary membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:811-23. [DOI: 10.1016/j.bbamem.2007.12.003] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2007] [Revised: 12/06/2007] [Accepted: 12/07/2007] [Indexed: 11/20/2022]
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16
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Tsogas I, Theodossiou T, Sideratou Z, Paleos CM, Collet H, Rossi JC, Romestand B, Commeyras A. Interaction and Transport of Poly(l-lysine) Dendrigrafts through Liposomal and Cellular Membranes: The Role of Generation and Surface Functionalization. Biomacromolecules 2007; 8:3263-70. [PMID: 17880235 DOI: 10.1021/bm700668w] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two generations of poly(l-lysine) dendrigrafts (DGLs) were studied with regard to their ability to interact with and translocate through liposomal and cellular membranes. Partial guanidinylation of the surface amino groups of the starting dendrigrafts afforded the guanidinylated derivatives whose membrane translocation properties were also assessed. Mixed liposomes, consisting of dihexadecyl phosphate, phosphatidylcholine, and cholesterol, were employed as model membranes, while A549 human lung carcinoma cells were used for cellular uptake studies. At high surface group/liposomal phosphate molar ratios and depending on the structure of the DGL, the interaction led to aggregation. Dendrigraft liposomal internalization was achieved, however, at low molar ratios. Thus translocation of the second generation dendrigrafts was rather limited at 25 degrees C, which, however, was enhanced when the bilayer was in the liquid-crystalline phase. In contrast, third-generation counterparts exhibited minor translocational ability. Furthermore, the introduction of a guanidinium group to dendrigrafts was found to enhance their transport through liposomal membranes. On the other hand, cellular uptake by A549 cells was monitored up to 3 h incubation time via fluorescence registration employing fluorescein-labeled dendrigrafts. The efficiency of dendrigraft internalization was enhanced by the presence of the guanidinium groups, while DGLs were preferentially localized in the nucleus and nuclear membrane, as revealed by fluorescence microscopy.
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Affiliation(s)
- Ioannis Tsogas
- Institute of Physical Chemistry, NCSR Demokritos, 15310 Aghia Paraskevi, Attiki, Greece
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Wang X, Mart RJ, Webb SJ. Vesicle aggregation by multivalent ligands: relating crosslinking ability to surface affinity. Org Biomol Chem 2007; 5:2498-505. [PMID: 17637972 DOI: 10.1039/b706662g] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In an effort to improve the stability of our tissue-mimetic vesicle aggregates, we have investigated how increasing the valency of our multivalent crosslinking ligand, poly-l-histidine, affected both the extent of vesicle aggregation and the affinity of the multivalent ligand for the synthetic receptor Cu(1) embedded in the vesicle membranes. Although increasing ligand valency gave the anticipated increase in the size of the vesicle aggregates, isothermal calorimetric studies did not show the expected increase in the valence-corrected binding constant for the embedded receptors. To explain both observations, we have developed a simple new binding model that encompasses both multivalent binding to receptors on a single vesicle surface (intramembrane binding) and vesicle crosslinking (intermembrane binding).
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Affiliation(s)
- Xi Wang
- Manchester Interdisciplinary Biocentre and the School of Chemistry, University of Manchester, 131 Princess Street, Manchester, UK
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18
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Tsogas I, Tsiourvas D, Paleos CM, Giatrellis S, Nounesis G. Interaction of l-arginine with dihexadecylphosphate unilamellar liposomes: the effect of the lipid phase organization. Chem Phys Lipids 2005; 134:59-68. [PMID: 15752464 DOI: 10.1016/j.chemphyslip.2004.12.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2004] [Revised: 12/16/2004] [Accepted: 12/20/2004] [Indexed: 11/23/2022]
Abstract
The interaction of L-arginine with unilamellar liposomes of dihexadecylphosphate sodium salt (DHP-Na) has been investigated using calorimetric, light scattering, fluorescence spectroscopy and zeta-potential techniques. Heating from room temperature, the bilayer exhibits a phase transition from a subgel (L(c)) to the gel (L(beta')) phase as well as a pre-transition (L(beta')-P(beta')), which is followed by the main lipid phase transition (P(beta')-L(alpha)). Direct studies of the interaction of L-arginine with the DHP-Na bilayers via isothermal titration calorimetry at 27 degrees C depict significant differences between samples in the L(c) and the L(beta') phases reflecting the effect of molecular organization of the lipids upon the interaction. While L-arginine has only a small impact upon the L(c) to L(beta') phase transition, it affects more significantly the transition temperature as well as the shape of the DSC peaks of the main lipid phase transition. Based on fluorescence and zeta-potential studies, the permeability of L-arginine through the liposomal membrane is higher within the temperature range of the main lipid phase transition. Encapsulated l-arginine obstructs the formation of the subgel phase.
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Affiliation(s)
- Ioannis Tsogas
- Institute of Physical Chemistry, NCSR Demokritos, 153 10 Aghia Paraskevi, Greece
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19
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Paleos CM, Tsiourvas D. Interaction between complementary liposomes: a process leading to multicompartment systems formation. J Mol Recognit 2005; 19:60-7. [PMID: 16312020 DOI: 10.1002/jmr.758] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Interaction of complementary liposomes induces a series of processes, involving reorganization of their membrane lipids, which lead to the formation of large aggregates. In several cases these aggregates exhibit multicompartment structures and only primitively mimic, in some aspects at least, the multicompartmental features of cells. Similar multicompartment structures were repeatedly obtained following the interaction of a diversity of complementary liposomal pairs. Thus, a working hypothesis is proposed, according to which, molecular recognition of liposomes induces the formation of multicompartment structures.
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Affiliation(s)
- Constantinos M Paleos
- Institute of Physical Chemistry, NCSR Demokritos, 15310 Aghia Paraskevi, Attiki, Greece.
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Pantos A, Tsiourvas D, Sideratou Z, Paleos CM, Giatrellis S, Nounesis G. Interactions of complementary PEGylated liposomes and characterization of the resulting aggregates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:6165-6172. [PMID: 15248699 DOI: 10.1021/la040026u] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The interaction of complementary liposomes bearing both recognizable and protective ligands at their external surface has been investigated. Aggregation of hydrogenated phosphatidyl choline/cholesterol (2:1 molar ratio) based liposomes was mediated by the molecular recognition of the complementary phosphate and guanidinium groups incorporated in separate unilamellar liposomes. The phosphate group was incorporated in the bilayer employing dihexadecyl phosphate, while the guanidinium moiety was introduced in the membrane through the incorporation of various guanidinium lipids. For the latter, anchoring ability and primarily introduction of a spacer group between their lipophilic part and the guanidinium group was found to affect the ability for molecular recognition. Also, poly(ethylene glycol) (PEG) introduced in both types of liposomes at various concentrations and up to 15% with respect to cholesterol modifies the interaction effectiveness and morphology of the obtained aggregates. Interaction of these complementary liposomes leads to large precipitating aggregates or fused liposomes, as shown by phase contrast microscopy and dynamic light scattering. Specifically, fusion of liposomes takes place under a nonleaking process involving lipid mixing, as demonstrated by calcein entrapment and resonance energy transfer experiments. Calorimetric parameters also correlate with the processes of aggregation and fusion. The interactions of non-PEGylated liposomes involve exothermic processes of higher enthalpic content than those of the PEGylated counterparts.
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Affiliation(s)
- Alexandros Pantos
- Institute of Physical Chemistry, NCSR "Demokritos", 15310 Aghia Paraskevi, Attiki, Greece
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22
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Literature Alerts. J Microencapsul 2003. [DOI: 10.3109/02652040309178068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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