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Abla KK, Mehanna MM. Lipid-based nanocarriers challenging the ocular biological barriers: Current paradigm and future perspectives. J Control Release 2023; 362:70-96. [PMID: 37591463 DOI: 10.1016/j.jconrel.2023.08.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 08/09/2023] [Accepted: 08/10/2023] [Indexed: 08/19/2023]
Abstract
Eye is the most specialized and sensory body organ and treating eye diseases efficiently is necessary. Despite various attempts, the design of a consummate ophthalmic drug delivery system remains unsolved because of anatomical and physiological barriers that hinder drug transport into the desired ocular tissues. It is important to advance new platforms to manage ocular disorders, whether they exist in the anterior or posterior cavities. Nanotechnology has piqued the interest of formulation scientists because of its capability to augment ocular bioavailability, control drug release, and minimize inefficacious drug absorption, with special attention to lipid-based nanocarriers (LBNs) because of their cellular safety profiles. LBNs have greatly improved medication availability at the targeted ocular site in the required concentration while causing minimal adverse effects on the eye tissues. Nevertheless, the exact mechanisms by which lipid-based nanocarriers can bypass different ocular barriers are still unclear and have not been discussed. Thus, to bridge this gap, the current work aims to highlight the applications of LBNs in the ocular drug delivery exploring the different ocular barriers and the mechanisms viz. adhesion, fusion, endocytosis, and lipid exchange, through which these platforms can overcome the barrier characteristics challenges.
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Affiliation(s)
- Kawthar K Abla
- Pharmaceutical Nanotechnology Research lab, Faculty of Pharmacy, Beirut Arab University, Beirut, Lebanon
| | - Mohammed M Mehanna
- Department of Industrial Pharmacy, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt; Department of Pharmaceutical Sciences, School of Pharmacy, Lebanese American University, Byblos, Lebanon.
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2
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Sun J, Kleuskens S, Luan J, Wang D, Zhang S, Li W, Uysal G, Wilson DA. Morphogenesis of starfish polymersomes. Nat Commun 2023; 14:3612. [PMID: 37330564 PMCID: PMC10276845 DOI: 10.1038/s41467-023-39305-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 06/06/2023] [Indexed: 06/19/2023] Open
Abstract
The enhanced membrane stability and chemical versatility of polymeric vesicles have made them promising tools in micro/nanoreactors, drug delivery, cell mimicking, etc. However, shape control over polymersomes remains a challenge and has restricted their full potential. Here we show that local curvature formation on the polymeric membrane can be controlled by applying poly(N-isopropylacrylamide) as a responsive hydrophobic unit, while adding salt ions to modulate the properties of poly(N-isopropylacrylamide) and its interaction with the polymeric membrane. Polymersomes with multiple arms are fabricated, and the number of arms could be tuned by salt concentration. Furthermore, the salt ions are shown to have a thermodynamic effect on the insertion of poly(N-isopropylacrylamide) into the polymeric membrane. This controlled shape transformation can provide evidence for studying the role of salt ions in curvature formation on polymeric membranes and biomembranes. Moreover, potential stimuli-responsive non-spherical polymersomes can be good candidates for various applications, especially in nanomedicine.
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Affiliation(s)
- Jiawei Sun
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Sandra Kleuskens
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Jiabin Luan
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Danni Wang
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Shaohua Zhang
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Wei Li
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Gizem Uysal
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Daniela A Wilson
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands.
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3
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De Rosa A, McGaughey S, Magrath I, Byrt C. Molecular membrane separation: plants inspire new technologies. THE NEW PHYTOLOGIST 2023; 238:33-54. [PMID: 36683439 DOI: 10.1111/nph.18762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Plants draw up their surrounding soil solution to gain water and nutrients required for growth, development and reproduction. Obtaining adequate water and nutrients involves taking up both desired and undesired elements from the soil solution and separating resources from waste. Desirable and undesirable elements in the soil solution can share similar chemical properties, such as size and charge. Plants use membrane separation mechanisms to distinguish between different molecules that have similar chemical properties. Membrane separation enables distribution or retention of resources and efflux or compartmentation of waste. Plants use specialised membrane separation mechanisms to adapt to challenging soil solution compositions and distinguish between resources and waste. Coordination and regulation of these mechanisms between different tissues, cell types and subcellular membranes supports plant nutrition, environmental stress tolerance and energy management. This review considers membrane separation mechanisms in plants that contribute to specialised separation processes and highlights mechanisms of interest for engineering plants with enhanced performance in challenging conditions and for inspiring the development of novel industrial membrane separation technologies. Knowledge gained from studying plant membrane separation mechanisms can be applied to developing precision separation technologies. Separation technologies are needed for harvesting resources from industrial wastes and transitioning to a circular green economy.
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Affiliation(s)
- Annamaria De Rosa
- Division of Plant Science, Research School of Biology, Australian National University, 2601, ACT, Acton, Australia
| | - Samantha McGaughey
- Division of Plant Science, Research School of Biology, Australian National University, 2601, ACT, Acton, Australia
| | - Isobel Magrath
- Division of Plant Science, Research School of Biology, Australian National University, 2601, ACT, Acton, Australia
| | - Caitlin Byrt
- Division of Plant Science, Research School of Biology, Australian National University, 2601, ACT, Acton, Australia
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4
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Sun J, Rijpkema SJ, Luan J, Zhang S, Wilson DA. Generating biomembrane-like local curvature in polymersomes via dynamic polymer insertion. Nat Commun 2021; 12:2235. [PMID: 33854061 PMCID: PMC8046815 DOI: 10.1038/s41467-021-22563-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 03/16/2021] [Indexed: 11/29/2022] Open
Abstract
Biomembrane curvature formation has long been observed to be essential in the change of membrane morphology and intracellular processes. The significant importance of curvature formation has attracted scientists from different backgrounds to study it. Although magnificent progress has been achieved using liposome models, the instability of these models restrict further exploration. Here, we report a new approach to mimic biomembrane curvature formation using polymersomes as a model, and poly(N-isopropylacrylamide) to induce the local curvature based on its co-nonsolvency phenomenon. Curvatures form when poly(N-isopropylacrylamide) becomes hydrophobic and inserts into the membrane through solvent addition. The insertion area can be fine-tuned by adjusting the poly(N-isopropylacrylamide) concentration, accompanied by the formation of new polymersome-based non-axisymmetric shapes. Moreover, a systematic view of curvature formation is provided through investigation of the segregation, local distribution and dissociation of inserted poly(N-isopropylacrylamide). This strategy successfully mimicks biomembrane curvature formation in polymersomes and a detailed observation of the insertion can be beneficial for a further understanding of the curvature formation process. Furthermore, polymer insertion induced shape changing could open up new routes for the design of non-axisymmetric nanocarriers and nanomachines to enrich the boundless possibilities of nanotechnology. Investigating biomembrane curvature formation is important for studying intracellular processes, but the instability of liposome models mimicking these membranes restricts exploration of membrane processes. Here, the authors demonstrate control over the curvature formation in polymersome membranes by insertion of PNIPAm as stimuli responsive polymer.
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Affiliation(s)
- Jiawei Sun
- Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands
| | - Sjoerd J Rijpkema
- Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands
| | - Jiabin Luan
- Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands
| | - Shaohua Zhang
- Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands
| | - Daniela A Wilson
- Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands.
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5
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Cai S, Liu J, Tian M, Wang K, Shen L. Diffusion dynamics of a single collapsed homopolymer globule at the solid-liquid interface. SOFT MATTER 2020; 16:2431-2436. [PMID: 31942904 DOI: 10.1039/c9sm02335f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Contradictive to the conventional wisdom that a collapsed polymer globule in poor solvents adsorb on surfaces in a way analogous to the spreading of a liquid droplet, here we have shown via single molecule measurements that a single poly(N-isoporpylacrylamide) (PNIPAM) globule can jump from one spot to another as an elastic nonadhesive ball even on a hydrophobic polystyrene surface. The molecular weight dependence of the effective surface diffusion coefficient measured for the adsorbed globule suggested that it exhibited mostly a similar globular conformation to that in the bulk solution. Both the displacement and waiting time distributions of the adsorbed globules were found to follow a power-law decay rather than an exponential process, suggesting a broad distribution of binding energies due to the difference in degree of globule deformation. These effects together reflect a character of the viscoelasticity even in a single-chain globule in dilute solutions. Our findings also demonstrate that it is not the single-chain globule but the inter-globule aggregates at high concentration that lead to irreversible adsorption on the surface, which provides novel dynamics and mechanisms of how a thermosensitive polymer adsorbs on the hydrophobic surface above its lower critical solution temperature.
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Affiliation(s)
- Shali Cai
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China.
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6
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Liu Y, Yao T, Cai W, Yu S, Hong Y, Nguyen KT, Yuan B. A Biocompatible and Near-Infrared Liposome for In Vivo Ultrasound-Switchable Fluorescence Imaging. Adv Healthc Mater 2020; 9:e1901457. [PMID: 31957243 DOI: 10.1002/adhm.201901457] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/18/2019] [Indexed: 12/17/2022]
Abstract
Fluorescence imaging is a remarkable tool for molecular targeting and multicolor imaging, but it suffers from low resolution in centimeter-deep tissues. The recently developed ultrasound-switchable fluorescence (USF) imaging has overcome this challenge and achieved in vivo imaging in a mouse with help from the indocyanine green (ICG) dye encapsulated poly(N-isopropylacrylamide) (ICG-PNIPAM) contrast agent. However, the ICG-PNIPAM has shortcomings, such as concerns about cytotoxicity and blueshifted excitation and emission spectra. This study introduces a newly developed ICG-encapsulated liposome to broaden the contrast agent selection for USF imaging and resolve the issues mentioned above. The emission peak of the ICG-liposome is 836 nm with excellent biostability and USF imaging capability. Furthermore, the cell viability test verifies the low cytotoxicity feature. Eventually, both ex vivo and in vivo USF imaging are successfully achieved and 3D USF images are acquired. The ex vivo result confirms that the ICG-liposome maintains the thermoresponsive characteristic at the right lobe of the liver and is able to conduct the USF imaging. The further in vivo USF imaging demonstrates that although the whole liver emitted fluorescence, only the right lobe of the liver contains the working ICG-liposome.
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Affiliation(s)
- Yang Liu
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
- Ultrasound and Optical Imaging Laboratory Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
| | - Tingfeng Yao
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
- Ultrasound and Optical Imaging Laboratory Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
| | - Wenbin Cai
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
- Ultrasound and Optical Imaging Laboratory Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
| | - Shuai Yu
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
- Ultrasound and Optical Imaging Laboratory Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
| | - Yi Hong
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
| | - Kytai T. Nguyen
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
| | - Baohong Yuan
- Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
- Joint Biomedical Engineering Program University of Texas at Arlington and University of Texas Southwestern Medical Center Dallas TX 75235 USA
- Ultrasound and Optical Imaging Laboratory Department of Bioengineering University of Texas at Arlington Arlington TX 76010 USA
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7
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Boisselier É, Demers É, Cantin L, Salesse C. How to gather useful and valuable information from protein binding measurements using Langmuir lipid monolayers. Adv Colloid Interface Sci 2017; 243:60-76. [PMID: 28372794 DOI: 10.1016/j.cis.2017.03.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 03/14/2017] [Accepted: 03/15/2017] [Indexed: 12/22/2022]
Abstract
This review presents data on the influence of various experimental parameters on the binding of proteins onto Langmuir lipid monolayers. The users of the Langmuir methodology are often unaware of the importance of choosing appropriate experimental conditions to validate the data acquired with this method. The protein Retinitis pigmentosa 2 (RP2) has been used throughout this review to illustrate the influence of these experimental parameters on the data gathered with Langmuir monolayers. The methods detailed in this review include the determination of protein binding parameters from the measurement of adsorption isotherms, infrared spectra of the protein in solution and in monolayers, ellipsometric isotherms and fluorescence micrographs.
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Affiliation(s)
- Élodie Boisselier
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada.
| | - Éric Demers
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Line Cantin
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Christian Salesse
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada.
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8
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Wu T, Shi H, Ye J. Effect of PLGA/lecithin hybrid microspheres and β-tricalcium phosphate granules on the physicochemical properties, in vitro degradation and biocompatibility of calcium phosphate cement. RSC Adv 2015. [DOI: 10.1039/c5ra06861d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
CPC with beta-TCP granules and PLGA/Lec microspheres reveals better degradability and cell affinity along with proper physicochemical properties.
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Affiliation(s)
- Tingting Wu
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510640
- China
- National Engineering Research Center for Tissue Restoration and Reconstruction
| | - Haishan Shi
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510640
- China
- National Engineering Research Center for Tissue Restoration and Reconstruction
| | - Jiandong Ye
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510640
- China
- National Engineering Research Center for Tissue Restoration and Reconstruction
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9
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Fluorescence Study of the Membrane Effects of Aggregated Lysozyme. J Fluoresc 2013; 23:1229-37. [DOI: 10.1007/s10895-013-1254-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 06/17/2013] [Indexed: 11/27/2022]
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10
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Cryopreservation of insulin-secreting INS832/13 cells using a wheat protein formulation. Cryobiology 2013; 66:136-43. [DOI: 10.1016/j.cryobiol.2012.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 12/14/2012] [Accepted: 12/15/2012] [Indexed: 11/21/2022]
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11
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Modulation of physiological and pathological activities of lysozyme by biological membranes. Cell Mol Biol Lett 2012; 17:349-75. [PMID: 22544762 PMCID: PMC6275811 DOI: 10.2478/s11658-012-0015-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 04/18/2012] [Indexed: 11/21/2022] Open
Abstract
The molecular details of interactions between lipid membranes and lysozyme (Lz), a small polycationic protein with a wide range of biological activities, have long been the focus of numerous studies. The biological consequences of this process are considered to embrace at least two aspects: i) correlation between antimicrobial and membranotropic properties of this protein, and ii) lipid-mediated Lz amyloidogenesis. The mechanisms underlying the lipid-assisted protein fibrillogenesis and membrane disruption exerted by Lz in bacterial cells are believed to be similar. The present investigation was undertaken to gain further insight into Lz-lipid interactions and explore the routes by which Lz exerts its antimicrobial and amyloidogenic actions. Binding and Förster resonance energy transfer studies revealed that upon increasing the content of anionic lipids in lipid vesicles, Lz forms aggregates in a membrane environment. Total internal reflection fluorescence microscopy and pyrene excimerization reaction were employed to study the effect of Lz on the structural and dynamic properties of lipid bilayers. It was found that Lz induces lipid demixing and reduction of bilayer free volume, the magnitude of this effect being much more pronounced for oligomeric protein.
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12
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Penetration of Lysozyme and Cytochrome C in Lipid Bilayer: Fluorescent Study. J Membr Biol 2011; 242:95-103. [DOI: 10.1007/s00232-011-9380-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Accepted: 06/20/2011] [Indexed: 10/18/2022]
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13
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Meratan AA, Ghasemi A, Nemat-Gorgani M. Membrane integrity and amyloid cytotoxicity: a model study involving mitochondria and lysozyme fibrillation products. J Mol Biol 2011; 409:826-38. [PMID: 21565199 DOI: 10.1016/j.jmb.2011.04.045] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 04/12/2011] [Accepted: 04/17/2011] [Indexed: 01/24/2023]
Abstract
Recent findings implicate that fibrillation products, the protein aggregates formed during the various steps leading to formation of mature fibrils, induce neurotoxicity predominantly in their intermediate oligomeric state. This has been shown to occur by increasing membrane permeability, eventually leading to cell death. Despite accumulating reports describing mechanisms of membrane permeabilization by oligomers in model membranes, studies directly targeted at characterizing the events occurring in biological membranes are rare. In the present report, we describe interaction of the original native structure, prefibrils and fibrils of hen egg white lysozyme (HEWL) with mitochondrial membranes, as an in vitro biological model, with the aim of gaining insight into possible mechanism of cytotoxicity at the membrane level. These structures were first characterized using a range of techniques, including fluorescence, size-exclusion chromatography, dynamic light scattering, transmission electron microscopy, dot blot analysis and circular dichroism. HEWL oligomers were found to be flexible/hydrophobic structures with the capacity to interact with mitochondrial membranes. Possible permeabilization of mitochondria was explored utilizing sensitive fluorometric and luminometric assays. Results presented demonstrate release of mitochondrial enzymes upon exposure to HEWL oligomers, but not native enzyme monomer or mature fibrils, in a concentration-dependent manner. Release of cytochrome c was also observed, as reported earlier, and membrane stabilization promoted by addition of calcium prevented release. Moreover, the oligomer-membrane interaction was influenced by high concentrations of NaCl and spermine. The observed release of proteins from mitochondria is suggested to occur by a nonspecific perturbation mechanism.
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Affiliation(s)
- Ali Akbar Meratan
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, 1417614411 Tehran, Iran
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14
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Trusova VM, Gorbenko GP, Akopova I, Molotkovsky JG, Gryczynski I, Borejdo J, Gryczynski Z. Morphological changes of supported lipid bilayers induced by lysozyme: planar domain formation vs. multilayer stacking. Colloids Surf B Biointerfaces 2010; 80:219-26. [PMID: 20620034 PMCID: PMC3277818 DOI: 10.1016/j.colsurfb.2010.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2010] [Revised: 06/10/2010] [Accepted: 06/16/2010] [Indexed: 01/14/2023]
Abstract
Total internal reflection fluorescence microscopy (TIRFM) has been utilized to explore the effect of cationic protein lysozyme (Lz) on the morphology of solid-supported lipid bilayers (SLBs) comprised of zwitterionic lipid phosphatidylcholine (PC) and its mixture with anionic lipid cardiolipin (CL). Kinetic TIRFM imaging of different systems revealed subtle interplay between lipid lateral segregation accompanied by exchange of neutral and acidic lipids in the protein-lipid interaction zone, and the formation of lipid multilayer stacks. The switch between these states was shown to be controlled by CL content. In weakly charged SLBs containing 5 mol% CL, assembling of CL molecules into planar domains upon Lz adsorption has been observed while at higher content of anionic lipid (25 mol%) in-plane domains tend to transform into multilayer stacks, thereby ensuring the most thermodynamically-favorable membrane conformation.
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Affiliation(s)
- Valeriya M Trusova
- Department of Biological and Medical Physics, VN Karazin Kharkov National University, 4 Svobody Sq, Kharkov 61077, Ukraine.
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15
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Comparative analysis of the electrostatics of the binding of cationic proteins to vesicles: Asymmetric location of anionic phospholipids. Anal Chim Acta 2009; 654:2-10. [DOI: 10.1016/j.aca.2009.08.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2009] [Revised: 06/24/2009] [Accepted: 08/14/2009] [Indexed: 11/23/2022]
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16
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Torrens F, Castellano G, Campos A, Abad C. Binding of water-soluble, globular proteins to anionic model membranes. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.12.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Chen D, Shelenkova L, Li Y, Kempf CR, Sabelnikov A. Laser Tweezers Raman Spectroscopy Potential for Studies of Complex Dynamic Cellular Processes: Single Cell Bacterial Lysis. Anal Chem 2009; 81:3227-38. [DOI: 10.1021/ac8023476] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- De Chen
- East Carolina University, Greenville, North Carolina 27858
| | - L. Shelenkova
- East Carolina University, Greenville, North Carolina 27858
| | - Y. Li
- East Carolina University, Greenville, North Carolina 27858
| | - C. R. Kempf
- East Carolina University, Greenville, North Carolina 27858
| | - A. Sabelnikov
- East Carolina University, Greenville, North Carolina 27858
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18
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Law SL, Lo WY, Lin M. Increase of Liposome Stability by Incorporation of Bovine Serum Albumin. Drug Dev Ind Pharm 2008. [DOI: 10.3109/03639049409038379] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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19
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Gorbenko GP, Ioffe VM, Molotkovsky JG, Kinnunen PK. Resonance energy transfer study of lysozyme–lipid interactions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1213-21. [DOI: 10.1016/j.bbamem.2007.09.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Revised: 09/06/2007] [Accepted: 09/17/2007] [Indexed: 11/24/2022]
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20
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Ioffe VM, Gorbenko GP, Deligeorgiev T, Gadjev N, Vasilev A. Fluorescence study of protein–lipid complexes with a new symmetric squarylium probe. Biophys Chem 2007; 128:75-86. [PMID: 17383795 DOI: 10.1016/j.bpc.2007.03.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Revised: 03/03/2007] [Accepted: 03/06/2007] [Indexed: 12/31/2022]
Abstract
The novel symmetric squarylium derivative SQ-1 has been synthesized and tested for its sensitivity to the formation of protein-lipid complexes. SQ-1 binding to the model membranes composed of zwitterionic lipid phosphatidylcholine (PC) and its mixtures with anionic lipid cardiolipin (CL) in different molar ratios was found to be controlled mainly by hydrophobic interactions. Lysozyme (Lz) and ribonuclease A (RNase) exerted an influence on the probe association with lipid vesicles resulting presumably from the competition between SQ-1 and the proteins for bilayer free volume and modification of its properties. The magnitude of this effect was much higher for lysozyme which may stem from the amphipathy of protein alpha-helix involved in the membrane binding. Varying membrane composition provides evidence for the dye sensitivity to both hydrophobic and electrostatic protein-lipid interactions. Fluorescence anisotropy studies uncovered the restriction of SQ-1 rotational mobility in lipid environment in the presence of Lz and RNase being indicative of the incorporation of the proteins into bilayer interior. The results of binding, fluorescence quenching and kinetic experiments suggested lysozyme-induced local lipid demixing upon protein association with negatively charged membranes with threshold concentration of CL for the lipid demixing being 10 mol%.
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Affiliation(s)
- Valeriya M Ioffe
- Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine.
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Gorbenko GP, Ioffe VM, Kinnunen PKJ. Binding of lysozyme to phospholipid bilayers: evidence for protein aggregation upon membrane association. Biophys J 2007; 93:140-53. [PMID: 17434939 PMCID: PMC1914450 DOI: 10.1529/biophysj.106.102749] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Biological functions of lysozyme, including its antimicrobial, antitumor, and immune-modulatory activities have been suggested to be largely determined by the lipid binding properties of this protein. To gain further insight into these interactions on a molecular level the association of lysozyme to liposomes composed of either 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine or its mixtures with 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-rac-glycerol, 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-rac-phosphatidylserine, or bovine heart cardiolipin was studied by a combination of fluorescence techniques. The characteristics of the adsorption of lysozyme to lipid bilayers were investigated using fluorescein 5'-isothiocyanate labeled protein, responding to membrane association by a decrease in fluorescence. Upon increasing the content of anionic phospholipids in lipid vesicles, the binding isotherms changed from Langmuir-like to sigmoidal. Using adsorption models based on scaled particle and double-layer theories, this finding was rationalized in terms of self-association of the membrane-bound protein. The extent of quenching of lysozyme tryptophan fluorescence by acrylamide decreased upon membrane binding, revealing a conformational transition for the protein upon its surface association, resulting in a diminished access of the fluorophore to the aqueous phase. Steady-state fluorescence anisotropy of bilayer-incorporated probe 1,6-diphenyl-1,3,5-hexatriene was measured at varying lipid-to-protein molar ratios. Lysozyme was found to increase acyl-chain order for liposomes with the content of acidic phospholipid exceeding 10 mol %. Both electrostatic and hydrophobic protein-lipid interactions can be concluded to modulate the aggregation behavior of lysozyme when bound to lipid bilayers. Modulation of lysozyme aggregation propensity by membrane binding may have important implications for protein fibrillogenesis in vivo. Disruption of membrane integrity by the aggregated protein species is likely to be the mechanism responsible for the cytotoxicity of lysozyme.
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Affiliation(s)
- Galyna P Gorbenko
- Department of Biological and Medical Physics, V. N. Karazin Kharkiv National University, Kharkiv, Ukraine
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22
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Ioffe V, Gorbenko GP. Lysozyme effect on structural state of model membranes as revealed by pyrene excimerization studies. Biophys Chem 2005; 114:199-204. [PMID: 15829353 DOI: 10.1016/j.bpc.2004.11.010] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2004] [Revised: 11/05/2004] [Accepted: 11/16/2004] [Indexed: 11/29/2022]
Abstract
Steady-state measurements of pyrene fluorescence in the model bilayer membranes composed of phosphatidylcholine (PC) and its mixtures with cardiolipin (CL) have been performed to gain insight into the effect of lysozyme on molecular organization of lipid bilayer. Analysis of vibronic structure of the probe emission spectra revealed no changes in transverse distribution of pyrene monomers on varying CL contents or increasing the extent of lysozyme binding to liposomes. Excimer-to-monomer fluorescence intensity ratio has been found to reduce on lysozyme association with lipids. The magnitude of this effect increased with increasing CL content from 0 to 40 mol%. These results have been interpreted as indicating decrease in the membrane free volume on formation of both electrostatic and hydrophobic protein-lipid contacts.
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Affiliation(s)
- Valeriya Ioffe
- Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, Ukraine
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23
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Wickramaratne MND, Fung LWM. Oxidative Reactions of Normal and Abnormal Hemoglobins in the Presence of Phosphatidylserine Vesicles. Hemoglobin 2005. [DOI: 10.1081/hem-47056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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24
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Behavioral effects of phosphatidylserine after perinatal administration in rats. Int J Dev Neurosci 2003; 2:347-53. [DOI: 10.1016/0736-5748(84)90071-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/09/1984] [Indexed: 11/21/2022] Open
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25
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Abstract
Liposomes are spherical lipid bilayers from 50 nm to 1000 nm in diameter that serve as convenient delivery vehicles for biologically active compounds. The field of liposome research has expanded considerably over the last 30 years. It is now possible to engineer a wide range of liposomes varying in size, phospholipid composition and surface characteristics to suit the specific application for which they are intended. This paper gives an overview of the main advances in liposome research from a point of view of their applications in medicine. Aqueous contrast enhancing agents entrapped in liposomal carriers can be targeted to the liver and spleen and distinctions can be made between normal and tumorous tissue using computed tomography. Topical application of liposomes has great potential in dermatology. Liposomes have been used to deliver anticancer agents in order to reduce the toxic effects of the drugs when given alone or to increase the circulation time and effectiveness of the drugs. From the original concept of encapsulating hemoglobin in an inert shell, liposome-encapsulated hemoglobin (LEH) has evolved into a fluid proven to carry oxygen, capable of surviving for reasonable periods in the circulation and amenable to large-scale production. Liposomes may be used to target specific cells by attaching amino acid fragments such as antibodies or proteins or appropriate fragments that target specific receptor sites. Liposomal DNA delivery vectors and further enhancements in the forms of LPDI and LPDII are some of the safest and potentially most versatile transfer vectors used to date. DNA vaccination and improved efficiency of gene therapy are just a few of the upcoming applications of liposomes.
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Affiliation(s)
- R Banerjee
- Cardiovascular Research Institute, University of California, San Francisco 94118-1245, USA.
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26
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Gorbenko GP. Resonance energy transfer study of hemoglobin complexes with model phospholipid membranes. Biophys Chem 1999; 81:93-105. [PMID: 10515045 DOI: 10.1016/s0301-4622(99)00085-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
By examining the resonance energy transfer between fluorescent probes, embedded in the lipid bilayer (4-(dimethylaminostyryl)-1-methylpiridine, 4-(dimethylaminostyryl)-1-dodecylpiridine, N,N'-bishexamethylenrhodamine, rhodamine 6G) as donors, and the heme group of hemoglobin as acceptor, the structure of the protein complexes with the model membranes composed of phosphatidylcholine and cardiolipin was characterized. Quantitative interpretation of the experimental data was performed in terms of the model of energy transfer in two-dimensional systems, using a set of parameters including the distance of closest approach between donor and acceptor, the vertical separation of donor planes, the acceptor distance from the donor plane and the orientation factor. The limits for the heme distance from the lipid bilayer center and the depth of the protein penetration in the membrane interior were estimated. The results obtained suggest that the depth of hemoglobin insertion into liposomal membranes decreases upon increasing CL content in the lipid bilayer.
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Affiliation(s)
- G P Gorbenko
- Department of Physics and Technology, Kharkov State University, Ukraine
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27
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Gorbenko GP. Resonance energy transfer study of hemoglobin and cytochrome c complexes with lipids. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1409:12-24. [PMID: 9804870 DOI: 10.1016/s0005-2728(98)00140-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The complexes of hemoglobin and cytochrome c with liposomes composed of phosphatidylcholine and its mixtures with cardiolipin and cholesterol have been studied by monitoring resonance energy transfer between fluorescent probe 3-methoxybenzanthrone as donor and heme groups of the proteins as acceptors. By analyzing experimental data within the framework of the model of energy transfer in two-dimensional systems, the limits of the range of possible heme positions with respect to lipid bilayer have been assessed. The distance of heme group of hemoglobin from the membrane center was found to increase in the presence of cardiolipin or cholesterol. The results obtained for cytochrome c complexes with cardiolipin-containing model membranes suggest the existence of preferential protein orientation relative to the lipid bilayer, and provide evidence for the protein penetration in the membrane interior.
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Affiliation(s)
- G P Gorbenko
- Department of Physics and Technology, Kharkov State University, Tobolskaya Str. 52-52, 310077 Kharkov, Ukraine
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28
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Gorbenko GP. Bromothymol blue as a probe for structural changes of model membranes induced by hemoglobin. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1370:107-18. [PMID: 9518571 DOI: 10.1016/s0005-2736(97)00252-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The effect of methemoglobin on the structure of model membranes composed of phosphatidylcholine and diphosphatidylglycerol (18 : 1, mol : mol) was studied with the help of pH-indicator dye bromothymol blue. The partition coefficients characterizing the dye binding to methemoglobin or model membranes were derived from the pKaalpha dependences on the protein or phospholipid concentration. The observed character of the dye partitioning in the lipid or lipid-protein systems is interpreted in terms of the traditional electrostatic approach and some modern theories of membrane electrostatics. It is assumed that methemoglobin affects the structural and physicochemical parameters of lipid-water interface.
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Affiliation(s)
- G P Gorbenko
- Department of Physics and Technology, Kharkov State University, Kharkov, 310077, Ukraine
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29
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Kim SM, Shin KH, Fujiwara T, Akutsu H. The interactions of ferric and ferrous cytochrome c with cardiolipin in phospholipid membranes studied by solid-state 2H and 31P NMR. J Mol Struct 1998. [DOI: 10.1016/s0022-2860(97)00255-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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30
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Van Rensburg CE, Anderson R, O'Sullivan JF. Riminophenazine compounds: pharmacology and anti-neoplastic potential. Crit Rev Oncol Hematol 1997; 25:55-67. [PMID: 9134311 DOI: 10.1016/s1040-8428(96)00229-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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31
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Yang E, Huestis W. Oxidative interactions between the erythrocyte membrane and phosphatidylcholine vesicles. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)36653-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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32
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Bergers JJ, Den Otter W, Dullens HF, Kerkvliet CT, Crommelin DJ. Interleukin-2-containing liposomes: interaction of interleukin-2 with liposomal bilayers and preliminary studies on application in cancer vaccines. Pharm Res 1993; 10:1715-21. [PMID: 8302756 DOI: 10.1023/a:1018913912580] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Interleukin-2 (IL-2) incorporation in liposomes was studied under different conditions. Information was obtained on the mechanism of interaction of glycosylated recombinant IL-2 with liposomal bilayers. This information was utilized to formulate liposomes with high levels of incorporated IL-2. Multilamellar vesicles were prepared by hydration of a lipid film with an IL-2 solution. The incorporation efficiency, measured with a bioassay after forced release of IL-2 from the vesicles, was strongly dependent on the charge of the liposomes and the pH and ionic strength of the hydration medium. Negatively charged liposomes composed of phosphatidylcholine/phosphatidylglycerol (9:1) and prepared with IL-2 dissolved in 10 mM NaAc/270 mM glycerol, 0.1% BSA, pH 5, showed the highest incorporation efficiency (81%) among the investigated preparations. This type of liposome was selected for further study. Electrostatics play a crucial role in the process of IL-2 association with this type of liposome. Initial studies concerning induction of protective tumor immunity by immunization with reconstituted membranes with muramyl tripeptide phosphatidylethanolamine indicate that coinjection of IL-2-containing liposomes provided a significant enhancement of the immune response.
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Affiliation(s)
- J J Bergers
- Department of Pharmaceutics, Faculty of Pharmacy, University of Utrecht, The Netherlands
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33
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Mosmuller EWJ, Franssen MCR, Engbersen JFJ. Lipase activity in vesicular systems: Characterization ofcandida cylindracea lipase and its activity in polymerizable dialkylammonium surfactant vesicles. Biotechnol Bioeng 1993; 42:196-204. [DOI: 10.1002/bit.260420207] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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34
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Bergers JJ, Vingerhoeds MH, van Bloois L, Herron JN, Janssen LH, Fischer MJ, Crommelin DJ. The role of protein charge in protein-lipid interactions. pH-dependent changes of the electrophoretic mobility of liposomes through adsorption of water-soluble, globular proteins. Biochemistry 1993; 32:4641-9. [PMID: 8485142 DOI: 10.1021/bi00068a023] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The role of electrostatics in the adsorption process of proteins to preformed negatively-charged (phosphatidylcholine/phosphatidylglycerol) and neutral (phosphatidylcholine) liposomes was studied. The interaction was monitored at low ionic strength for a set of model proteins as a function of pH. The adsorption behavior of trypsin inhibitor (pI = 4.6), myoglobin (pI = 7.4), ribonuclease (pI = 9.6), and lysozyme (pI = 10.7) with preformed liposomes was investigated, along with changes in the electrophoretic mobility of liposomes through the adsorption of charged proteins. Mean protein charge was determined by acid/base titration. Significant adsorption of the proteins to negatively-charged liposomes was only found at pH values where the number of positive charge moieties exceeds the number of negative charge moieties on the protein by at least three charge units. Negligible adsorption to liposomes composed of zwitterionic lipids was observed in the pH range tested (4-9). The absolute value of the electrophoretic mobilities of negatively-charged, empty liposomes decreased after adsorption of positively-charged proteins. With increasing protein to phospholipid ratio, the drop in the electrophoretic mobility leveled off and reached a plateau; protein adsorption profiles showed a similar shape. Analysis of the data demonstrated that neutralization of the liposome charge due to the adsorption of the positively-charged proteins is the controlling factor in their adsorption. The plateau level reached depended on the type of protein and the pH of the incubation medium. This pH dependency could be ascribed to the mean positive charge of the protein.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J J Bergers
- Department of Pharmaceutics, Faculty of Pharmacy, Utrecht University, The Netherlands
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35
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36
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Arnold K, Hoekstra D, Ohki S. Association of lysozyme to phospholipid surfaces and vesicle fusion. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1124:88-94. [PMID: 1543731 DOI: 10.1016/0005-2760(92)90130-n] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Lysozyme-induced fusion of phosphatidylserine (PS) vesicles was studied as a function of pH. Fusion, monitored by lipid-mixing, was measured by following the dilution of pyrene-labelled phosphatidylcholine, incorporated in PS vesicles, into unlabelled bilayers. It is demonstrated that lysozyme-induced fusion is pH-dependent and significant fusion is triggered at pH 5 or below. The interaction of lysozyme with the vesicle bilayer was characterized by measuring resonance energy transfer from tryptophane, present in the protein, to pyrene. It is shown that concomitant with fusion, a strong resonance energy transfer signal appears at pH 5 or below. Furthermore, in monolayer experiments it was found that addition of lysozyme to the subphase caused an increase in surface pressure, when the pH was kept below 5.5. Very low concentrations of lysozyme sufficed to bring about the observed effects. The results are taken to indicate that lysozyme-induced fusion results from penetration of protein into the hydrophobic core of the bilayer, occurring at acidic pH.
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Affiliation(s)
- K Arnold
- Department of Biophysical Sciences, State University of New York, Buffalo
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37
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Chang PS, Rhee JS, Kim JJ. Continuous glycerolysis of olive oil byChromobacterium viscosum lipase immobilized in liposome in reversed micelles. Biotechnol Bioeng 1991; 38:1159-65. [DOI: 10.1002/bit.260381007] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Oishi K, Zheng B, Kuo JF. Inhibition of Na,K-ATPase and sodium pump by protein kinase C regulators sphingosine, lysophosphatidylcholine, and oleic acid. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)40196-8] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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39
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Szebeni J, Hauser H, Eskelson CD, Watson RR, Winterhalter KH. Interaction of hemoglobin derivatives with liposomes. Membrane cholesterol protects against the changes of hemoglobin. Biochemistry 1988; 27:6425-34. [PMID: 3219344 DOI: 10.1021/bi00417a034] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Hemoglobin (Hb) was incubated with small unilamellar vesicles of different lipid compositions in physiological or low pH-low ionic strength media, and the alterations in the protein and bilayer structure were analyzed by measuring (i) the sedimentation properties and elution pattern of the vesicles upon gel filtration, (ii) the quenching effect of Hb on the fluorescence of membrane-embedded probes, (iii) the intrinsic fluorescence of Hb, and (iv) the Soret spectra of Hb. The results indicate complex formation between Hb and the membrane, followed by intercalation of the protein into the bilayer. These processes can lead to secondary alterations, including aggregation, peroxidative decomposition of unsaturated fatty acids, unfolding of Hb, oxidation of the heme iron, displacement of the heme relative to globin, and oxidative or nonoxidative deconjugation of the porphyrin ring. Complex formation and intercalation of Hb into the bilayer are primarily due to hydrophobic interaction between the protein and the membrane, whereas displacement of the heme and its nonoxidative deconjugation are elicited by ionic interaction between the heme and negative membrane surface charges. These charges, on the other hand, inhibit the oxidative processes in unsaturated lipid vesicles. The rate and extent of alterations both in the protein and in the membrane show inverse correlation with the stability of the heme-globin linkage. The liquid-crystalline phase state promotes the penetration of Hb into the bilayer, whereas displacement of the heme is most expressed in the case of saturated bilayers in the gel state. Cholesterol inhibits both the hydrophobic and ionic interactions between the protein and bilayer, most remarkably the partition of the heme into negatively charged saturated bilayers. It is suggested that the effects of cholesterol are mediated through changes in membrane fluidity.
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Affiliation(s)
- J Szebeni
- Department of Physiology, National Institute of Food Hygiene and Nutrition, Budapest, Hungary
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40
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Abstract
This article describes the properties, production and characterization of liposomes with special reference to their use as membrane model for the study of lipid peroxidation. It presents briefly the methods that can be used for the assay of liposomal lipid peroxidation and brings out the special advantages these liposomes provide in elucidating the mechanism of lipid peroxidation by different physical and chemical agents. Studies involving liposomal lipid peroxidation by different agents and the consequent changes in the structure and function of liposomal membrane have been reviewed briefly.
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Affiliation(s)
- S N Chatterjee
- Biophysics Division, Saha Institute of Nuclear Physics, Calcutta, India
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41
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Waltham MC, Cornell BA, Smith R. Association of ferri- and ferro-cytochrome c with lipid multilayers: a 31P solid-state NMR study. BIOCHIMICA ET BIOPHYSICA ACTA 1986; 862:451-6. [PMID: 3022812 DOI: 10.1016/0005-2736(86)90250-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The 31P nuclear magnetic resonance anisotropies of dispersions of diacylphosphatidic acid and diacylphosphatidylserine were slightly increased in the presence of cytochrome c: no increase was observed with cardiolipin. However, the 31P spin-lattice relaxation times (T1) for all of these lipids were reduced markedly by the protein. As similar effects were observed with ferri-cytochrome c and with the reduced protein, which is diamagnetic, we suggest that the changes in T1 reflect a reduction in the spectral density of fast motions for the lipid headgroups attendant on binding of protein, rather than paramagnetic relaxation of the phosphorus nuclear spin.
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42
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Klyachko NL, Levashov AV, Pshezhetsky AV, Bogdanova NG, Berezin IV, Martinek K. Catalysis by enzymes entrapped into hydrated surfactant aggregates having lamellar or cylindrical (hexagonal) or ball-shaped (cubic) structure in organic solvents. EUROPEAN JOURNAL OF BIOCHEMISTRY 1986; 161:149-54. [PMID: 3780732 DOI: 10.1111/j.1432-1033.1986.tb10135.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Instead of aqueous solutions, universally recognized in enzymology, ternary systems of the water/organic solvent/surfactant type are suggested as liquid-crystalline media for enzymatic reactions. Two systems, water/octane/Aerosol OT and water/cyclohexane/Brij 96, have been used to solubilize acid and alkaline phosphatases and peroxidase. The enzymes under study do function in liquid-crystalline mesophases having lamellar, cylindrical (reversed hexagonal) and ball-shaped (reversed cubic) packing of the surfactant molecules. A significant result is that the phase transition from one liquid-crystalline structure to another entails, as a rule, a reversible change in the catalytic activity of the solubilized enzyme.
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Abstract
The interactions of serum proteins are diverse, complex and can lead to dramatic effects on liposome stability and in vivo behavior; conversely lipids can modify the biological activities of serum proteins. Serum lipoproteins can potentially destabilize bilayer membranes leading to vesicle disruption and loss of contents; irregularities in the lipid bilayer, such as those which exist at phase boundaries, promote the destabilizing effects of lipoproteins. Other serum components such as fibronectin, immunoglobulins and C reactive protein can modify the biological properties of liposomes by promoting interactions with reticuloendothelial cells and/or activation of the complement system. Liposomes can avidly bind certain serum clotting factors, a process which can lead to dramatic effects on the clotting cascade. Thus the interactions of liposomes with serum proteins can reciprocally effect both components involved.
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45
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Martinek K, Levashov AV, Klyachko N, Khmelnitski YL, Berezin IV. Micellar enzymology. EUROPEAN JOURNAL OF BIOCHEMISTRY 1986; 155:453-68. [PMID: 2420585 DOI: 10.1111/j.1432-1033.1986.tb09512.x] [Citation(s) in RCA: 476] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Experimental approaches to modelling the enzymatic function of biological membranes are discussed. Emphasis is given to pseudohomogeneous systems such as proteolipid complexes and enzymes in organic solvents; the latter are solubilized with phospholipids or synthetic surfactants. Methods for producing and studying such micellar systems are considered. The key research problems of micellar enzymology are formulated and its relation to enzyme membranology is discussed. Finally, the new potentialities are noted of applied enzymology (biotechnology) offered by application of a colloidal solution of water in organic solvents as a microheterogeneous medium for enzymatic reactions.
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46
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Hájek I, Teisinger J, Syková E. The effect of opioids and of naloxone on Na+,K+-adenosine triphosphatase activity in frog spinal cord membrane fractions. Neurosci Lett 1985; 59:291-5. [PMID: 2997669 DOI: 10.1016/0304-3940(85)90147-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The effects of opioids and of naloxone on ouabain-sensitive Na+,K+-adenosine triphosphatase (ATPase) activity were studied in vitro on membrane fractions from frog spinal cords. The addition of morphine and of the stable enkephalin analogue, D-Ala2,D-Leu5-enkephalin, in concentrations from 10(-7) to 10(-4) M significantly increased Na+,K+-ATPase activity. No effect was found with methionine enkephalin (Met-Enk). However, the addition of two peptidase inhibitors, captopril and phosphoramidon (10(-5) M each), significantly increased Na+,K+-ATPase activity. A further increase in enzyme activity was found when Met-Enk (10(-4) or 10(-7) M) was added simultaneously with peptidase inhibitors. On the other hand, the addition of the opiate antagonist, naloxone, at low concentration (10(-7) M) decreased the activity of Na+,K+-ATPase. These results are discussed with respect to the effect of synthetic and endogenous opioids on the activity of Na+,K+-ATPase.
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47
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Chen CH, Guard-Friar D. Thermodynamic examination of the ordering of lipid hydrocarbon chains in the presence of protein. Biopolymers 1985. [DOI: 10.1002/bip.360240403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Abstract
A method has been developed for preparing unique hydrophilic HSA/MS. Important aspects of this synthesis include addition of the cross-linking agent (glutaraldehyde) in the organic phase and use of concentrated polymer solutions as dispersion media. The polymer solutions afford excellent steric stabilization of aqueous albumin microdispersions for microsphere synthesis. Steric stabilization of dispersions by polymer solutions was shown to be a function of polymer concentration and molecular weight. The HSA/MS prepared by this method are hydrophilic and easily dispersed in a variety of aqueous media without surfactants. Chemical modifications are easily accomplished using available reactive aldehyde groups remaining after cross-linking. Although hydrophilicity of the microspheres is advantageous for many drug delivery applications, in some instances (such as the use of MS in adjuvant immunotherapy or vaccine preparations) some hydrophobicity may be desirable. For this purpose, surface modifications to produce controlled hydrophobicity is easily achieved by covalent coupling with appropriate reagents (e.g., fatty amines). Adriamycin was bound to HSA/MS by both physical association (to 18 wt%) and covalent binding (also to 18 wt%). In vitro release of drug was measured for the MS using a dynamic flow method. Two distinct release mechanisms could be achieved depending on the type of drug bonding used: slow by hydrolytic degradation of covalent bonds and fast by release of physically adsorbed drug. This new and versatile synthesis of hydrophilic HSA/MS opens up many new opportunities for producing chemically modified MS containing high concentrations of therapeutic agents. Use for immunodiagnostic and adjuvant compositions is also suggested.(ABSTRACT TRUNCATED AT 250 WORDS)
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49
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Abstract
Large unilamellar lipid vesicles are prepared by a detergent dialysis procedure using beta-D-octylglucoside as the detergent. This procedure is nondenaturing and allows for the encapsulation of sensitive biological molecules. Vesicles prepared with the composition of 2 mol phosphatidylcholine and 1 mol cholesterol have a mean diameter of 200 nm and allow for the encapsulation of 150 molecules of alkaline phosphatase per vesicle without loss of activity. Stability studies show that less than 4 per cent of the original enzyme leaks from the vesicles over a 250 day period upon storage at 4 degrees C. A mechanistic model for vesicle formation is described to provide a clear understanding of the events occurring during the encapsulation stages.
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Affiliation(s)
- J W Freytag
- Biomedical Products Department, E.I. du Pont de Nemours & Co., Inc., Glasgow Research Laboratory, Wilmington, Delaware 19898
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50
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Bador H, Morelis R, Louisot P. Breaks in arrhenius plots of reactions involving membrane-bound and solubilized sialyltransferases, due to temperature dependence of kinetic parameters. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 800:75-86. [PMID: 6743685 DOI: 10.1016/0304-4165(84)90096-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Temperature dependence of asialomucin-sialyltransferase (CMP-N-acetylneuraminate:D-galactosyl-glycoprotein N-acetylneuraminyltransferase, EC 2.4.99.1) activity is investigated. Discontinuities in Arrhenius plots are observed, whether the enzyme is membrane-associated or solubilized. These discontinuities cannot be firmly correlated with the phase-transition temperatures of either endogenous or exogenous phospholipids. Arrhenius plots of the kinetic parameters also exhibit sharp discontinuities, so that it is concluded that a significant change in Km and Vmax values occurs with varying temperature. Our results suggest that the biphasic behavior of Arrhenius plots may be attributed to the temperature dependence of the kinetic parameters for both membrane-associated and solubilized sialyltransferase activities.
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