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Chen Q, Sun T, Jiang C. Recent Advancements in Nanomedicine for 'Cold' Tumor Immunotherapy. NANO-MICRO LETTERS 2021; 13:92. [PMID: 34138315 PMCID: PMC8006526 DOI: 10.1007/s40820-021-00622-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 01/31/2021] [Indexed: 05/02/2023]
Abstract
Although current anticancer immunotherapies using immune checkpoint inhibitors (ICIs) have been reported with a high clinical success rate, numerous patients still bear 'cold' tumors with insufficient T cell infiltration and low immunogenicity, responding poorly to ICI therapy. Considering the advancements in precision medicine, in-depth mechanism studies on the tumor immune microenvironment (TIME) among cold tumors are required to improve the treatment for these patients. Nanomedicine has emerged as a promising drug delivery system in anticancer immunotherapy, activates immune function, modulates the TIME, and has been applied in combination with other anticancer therapeutic strategies. This review initially summarizes the mechanisms underlying immunosuppressive TIME in cold tumors and addresses the recent advancements in nanotechnology for cold TIME reversal-based therapies, as well as a brief talk about the feasibility of clinical translation.
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Affiliation(s)
- Qinjun Chen
- Key Laboratory of Smart Drug Delivery (Ministry of Education), State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Department of Pharmaceutics, and School of Pharmacy, Research Center on Aging and Medicine, Fudan University, Shanghai, 201203, People's Republic of China
| | - Tao Sun
- Key Laboratory of Smart Drug Delivery (Ministry of Education), State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Department of Pharmaceutics, and School of Pharmacy, Research Center on Aging and Medicine, Fudan University, Shanghai, 201203, People's Republic of China
| | - Chen Jiang
- Key Laboratory of Smart Drug Delivery (Ministry of Education), State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Department of Pharmaceutics, and School of Pharmacy, Research Center on Aging and Medicine, Fudan University, Shanghai, 201203, People's Republic of China.
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2
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Korpi A, Ma C, Liu K, Nonappa, Herrmann A, Ikkala O, Kostiainen MA. Self-Assembly of Electrostatic Cocrystals from Supercharged Fusion Peptides and Protein Cages. ACS Macro Lett 2018; 7:318-323. [PMID: 30271674 PMCID: PMC6156108 DOI: 10.1021/acsmacrolett.8b00023] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 02/13/2018] [Indexed: 12/21/2022]
Abstract
Self-assembly is a convenient process to arrange complex biomolecules into large hierarchically ordered structures. Electrostatic attraction between the building blocks is a particularly interesting driving force for the assembly process, as it is easily tunable and reversible. Large biomolecules with high surface charge density, such as proteins and protein cages, are very promising building blocks due to their uniform size and shape. Assemblies of functional molecules with well-defined nanostructures have wide-ranging applications but are difficult to produce precisely by synthetic methods. Furthermore, obtaining highly ordered structures is an important prerequisite for X-ray structure analysis. Here we show how negatively charged ferritin and viral protein cages can adopt specific cocrystal structures with supercharged cationic polypeptides (SUPs, K72) and their recombinant fusions with green fluorescent protein (GFP-K72). The cage structures and recombinant proteins self-assemble in aqueous solution to large ordered structures, where the structure morphology and size are controlled by the ratio of oppositely charged building blocks and the electrolyte concentration. Both ferritin and viral cages form cocrystals with face centered cubic structure and lattice constants of 14.0 and 28.5 nm, respectively. The crystals are porous and the cationic recombinant proteins occupy the voids between the cages. Such systems resemble naturally occurring occlusion bodies and may serve as protecting agents as well as aid the structure determination of biomolecules by X-ray scattering.
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Affiliation(s)
- Antti Korpi
- Biohybrid
Materials, Department of Bioproducts and Biosystems, Aalto University, FI-00076 Aalto, Finland
| | - Chao Ma
- Zernike
Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Kai Liu
- Zernike
Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Nonappa
- Molecular
Materials, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Andreas Herrmann
- Zernike
Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Olli Ikkala
- Molecular
Materials, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Mauri A. Kostiainen
- Biohybrid
Materials, Department of Bioproducts and Biosystems, Aalto University, FI-00076 Aalto, Finland
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3
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Chou KH, McCallum C, Gillespie D, Pennathur S. An Experimental Approach to Systematically Probe Charge Inversion in Nanofluidic Channels. NANO LETTERS 2018; 18:1191-1195. [PMID: 29266955 DOI: 10.1021/acs.nanolett.7b04736] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Charge inversion of the surfaces of nanofluidic channels occurs in systems with high-surface charge and/or highly charged ions and is of particular interest because of applications in biological and energy conversion systems. However, the details of such charge inversion have not been clearly elucidated. Specifically, although we can experimentally and theoretically show charge inversion, understanding at what conditions charge inversion occurs, as well how much the charge-inverting ions change the surface, are not known. Here, we show a novel experimental approach for uniquely finding both the ζ-potential and adsorption time of charge inverting ions in aqueous nanofluidic systems.
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Affiliation(s)
- Kuang-Hua Chou
- University of California , Santa Barbara, California, 93106, United States
| | | | - Dirk Gillespie
- Rush University Medical Center , Chicago, Illinois, 60612, United States
| | - Sumita Pennathur
- University of California , Santa Barbara, California, 93106, United States
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4
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Becton M, Averett R, Wang X. Effects of nanobubble collapse on cell membrane integrity. JOURNAL OF MICROMECHANICS AND MOLECULAR PHYSICS 2017; 2:1750008. [PMID: 29863153 PMCID: PMC5975966 DOI: 10.1142/s2424913017500084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Recent studies have shown that ultrasound is used to open drug-carrying liposomes to release their payloads; however, a shockwave energetic enough to rupture lipid membranes can cause collateral damage to surrounding cells. Similarly, a destructive shockwave, which may be used to rupture a cell membrane in order to lyse the cell (e.g., as in cancer treatments) may also impair or destroy nearby healthy tissue. To address this problem, we use dissipative particle dynamic (DPD) simulation to investigate the addition of a cavitation bubble between the shockwave and the model cell membrane to alter the shockwave front, allowing low-velocity shockwaves to specifically damage an intended target. We focus specifically on a spherical lipid bilayer model, and note the effect of shockwave velocity, bubble size, and orientation on the damage to the model cell. We show that a cavitation bubble greatly decreases the necessary shockwave velocity required to damage the lipid bilayer and rupture the model cell. The cavitation bubble focuses the kinetic energy of the shockwave front into a smaller area, inducing penetration at the edge of the model cell. With this work, we provide a comprehensive approach to the intricacies of model cell destruction via shockwave impact, and hope to offer a guideline for initiating targeted cellular destruction using induced cavitation bubbles and low-velocity shockwaves.
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Affiliation(s)
- Matthew Becton
- College of Engineering, University of Georgia Athens, GA 30602, USA
| | - Rodney Averett
- College of Engineering, University of Georgia Athens, GA 30602, USA
| | - Xianqiao Wang
- College of Engineering, University of Georgia Athens, GA 30602, USA
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5
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Li H, Lu B. An ionic concentration and size dependent dielectric permittivity Poisson-Boltzmann model for biomolecular solvation studies. J Chem Phys 2014; 141:024115. [DOI: 10.1063/1.4887342] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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6
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Maury B, Gonçalves C, Tresset G, Zeghal M, Cheradame H, Guégan P, Pichon C, Midoux P. Influence of pDNA availability on transfection efficiency of polyplexes in non-proliferative cells. Biomaterials 2014; 35:5977-85. [PMID: 24768195 DOI: 10.1016/j.biomaterials.2014.04.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 04/01/2014] [Indexed: 02/05/2023]
Abstract
We succeeded in visualizing plasmid DNA (pDNA) in the nucleus and cytosol of non-proliferative cells after transfection with linear polyethylenemine (lPEI) and histidinylated lPEI (His16-lPEI). This was possible with confocal microscope by using pDNA labelled with quantum dots. Indeed pDNA labelled with Cy3 leads to false positive nuclear localization because the saturation of the fluorescence signal overestimated the volume occupied by Cy3-pDNA. Moreover, Cy3 brightness was too weak to detect low amount of pDNA. About 20 to 40 pDNA copies were detected in the nucleus after the transfection of pDNA labelled with quantum dots. Transfection efficiency and cellular imaging data suggested that the cytosolic availability of pDNA, including endosome escape and/or polyplexes dissociation, is crucial for its nuclear delivery. In vitro transcription assay and transfection of cells allowing cytosolic gene expression concluded to better cytosolic availability of pDNA within His16-lPEI polyplexes. Cryo-TEM analyses revealed that His16-lPEI polyplexes exhibited a spherical shape and an amorphous internal structure which differed from the high degree of order of lPEI polyplexes. Altogether, this comparative study indicated that the high transfection efficiency of non-proliferative cells with His16-lPEI polyplexes was related to the amorphous structure and the facilitated dissociation of the assemblies.
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Affiliation(s)
- Benoit Maury
- Centre de Biophysique Moléculaire, CNRS UPR4301, Inserm et Université d'Orléans, 45071 Orléans cedex 02, France.
| | - Cristine Gonçalves
- Centre de Biophysique Moléculaire, CNRS UPR4301, Inserm et Université d'Orléans, 45071 Orléans cedex 02, France
| | - Guillaume Tresset
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, 91405 Orsay cedex, France
| | - Mehdi Zeghal
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, 91405 Orsay cedex, France
| | - Hervé Cheradame
- Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, CNRS UMR8587 Université d'Evry Val d'Essonne, Evry, France
| | - Philippe Guégan
- Laboratoire de Chimie des Polymères, Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM, Chimie des Polymères, F-75005 Paris, France; CNRS, UMR 8232, IPCM, Chimie des Polymères, F-75005 Paris, France
| | - Chantal Pichon
- Centre de Biophysique Moléculaire, CNRS UPR4301, Inserm et Université d'Orléans, 45071 Orléans cedex 02, France
| | - Patrick Midoux
- Centre de Biophysique Moléculaire, CNRS UPR4301, Inserm et Université d'Orléans, 45071 Orléans cedex 02, France.
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7
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Martín-Molina A, Luque-Caballero G, Faraudo J, Quesada-Pérez M, Maldonado-Valderrama J. Adsorption of DNA onto anionic lipid surfaces. Adv Colloid Interface Sci 2014; 206:172-85. [PMID: 24359695 DOI: 10.1016/j.cis.2013.11.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 10/16/2013] [Accepted: 11/11/2013] [Indexed: 01/05/2023]
Abstract
Currently self-assembled DNA delivery systems composed of DNA multivalent cations and anionic lipids are considered to be promising tools for gene therapy. These systems become an alternative to traditional cationic lipid-DNA complexes because of their low cytotoxicity lipids. However, currently these nonviral gene delivery methods exhibit low transfection efficiencies. This feature is in large part due to the poorly understood DNA complexation mechanisms at the molecular level. It is well-known that the adsorption of DNA onto like charged lipid surfaces requires the presence of multivalent cations that act as bridges between DNA and anionic lipids. Unfortunately, the molecular mechanisms behind such adsorption phenomenon still remain unclear. Accordingly a historical background of experimental evidence related to adsorption and complexation of DNA onto anionic lipid surfaces mediated by different multivalent cations is firstly reviewed. Next, recent experiments aimed to characterise the interfacial adsorption of DNA onto a model anionic phospholipid monolayer mediated by Ca(2+) (including AFM images) are discussed. Afterwards, modelling studies of DNA adsorption onto charged surfaces are summarised before presenting preliminary results obtained from both CG and all-atomic MD computer simulations. Our results allow us to establish the optimal conditions for cation-mediated adsorption of DNA onto negatively charged surfaces. Moreover, atomistic simulations provide an excellent framework to understand the interaction between DNA and anionic lipids in the presence of divalent cations. Accordingly,our simulation results in conjunction go beyond the macroscopic picture in which DNA is stuck to anionic membranes by using multivalent cations that form glue layers between them. Structural aspects of the DNA adsorption and molecular binding between the different charged groups from DNA and lipids in the presence of divalent cations are reported in the last part of the study. Although this research work is far from biomedical applications, we truly believe that scientific advances in this line will assist, at least in part, in the rational design and development of optimal carrier systems for genes and applicable to other drugs.
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8
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Ramezani R, Sadeghizadeh M, Behmanesh M, Hosseinkhani S. Characterization of Zwitterionic Phosphatidylcholine-Based Bilayer Vesicles as Efficient Self-Assembled Virus-Like Gene Carriers. Mol Biotechnol 2013; 55:120-30. [DOI: 10.1007/s12033-013-9663-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Tresset G, Lansac Y, Romet-Lemonne G. Supramolecular assemblies of lipid-coated polyelectrolytes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5743-5752. [PMID: 22428930 DOI: 10.1021/la2048135] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We reveal the existence of a general class of supramolecular assemblies made up of lipid-coated polyelectrolytes including the celebrated lipid-nucleic acid complexes. With the aid of high-resolution cryo-electron microscopy, we unveil the nanoscale internal organization of assemblies generated with a wide range of synthetic and biological polyelectrolytes, several of them being investigated in this context for the first time, namely, poly(styrene sulfonic acid), carboxylmethylcellulose, and filamentous actin. Using an original coarse-grained model representing lipid-coated polyelectrolytes as semiflexible tubes, we thoroughly explored the morphologies resulting from the self-assembly process as a function of tube lengths and rigidities; the computed structures are fully consistent with the experimental observations. In particular, we found a strong extension of the correlation range of the order parameter as the rigidity of the lipid-coated polyelectrolytes increases. Electrostatic interactions provide a stabilizing mechanism leading to finite-size equilibrium assemblies. These assemblies may constitute a generic route for interfacing polyelectrolytes to living cells to perform gene delivery, for instance.
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Affiliation(s)
- Guillaume Tresset
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, 91405 Orsay, France.
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10
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Pisani M, Mobbili G, Placentino IF, Smorlesi A, Bruni P. Biophysical Characterization of Complexes of DNA with Mixtures of the Neutral Lipids 1,2-Dioleoyl-sn-glycero-3-phosphoethanolamine-N-hexanoylamine or 1,2-Dioleoyl-sn-glycero-3-phosphoethanolamine-N-dodecanoylamine and 1,2-Dioleoyl-sn-glycero-3-phosphocholine in the Presence of Bivalent Metal Cations for DNA Transfection. J Phys Chem B 2011; 115:10198-206. [DOI: 10.1021/jp202577u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Michela Pisani
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Giovanna Mobbili
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Immacolata F. Placentino
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Arianna Smorlesi
- Department of Pathology and Innovative Therapies, Polytechnic University of Marche, Via Tronto 10/A, 60100 Ancona, Italy
| | - Paolo Bruni
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
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11
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Li D, Zhou W, Landskron K, Sato S, Kiely CJ, Fujita M, Liu T. Viral-Capsid-Type Vesicle-Like Structures Assembled from M12L24 Metal-Organic Hybrid Nanocages. Angew Chem Int Ed Engl 2011; 50:5182-7. [DOI: 10.1002/anie.201007829] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Indexed: 11/11/2022]
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12
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Li D, Zhou W, Landskron K, Sato S, Kiely CJ, Fujita M, Liu T. Viral-Capsid-Type Vesicle-Like Structures Assembled from M12L24 Metal-Organic Hybrid Nanocages. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007829] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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Tresset G, Lansac Y. Long-Range Architecture of Single Lipid-Based Complex Nanoparticles with Local Hexagonal Packing. J Phys Chem Lett 2011; 2:41-46. [PMID: 26295212 DOI: 10.1021/jz101430e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The three-dimensional architecture of single nanoparticles made of inverse micellar lipids templated on polyelectrolytes and exhibiting a local hexagonal packing is elucidated by high-resolution cryoelectron microscopy and coarse-grained Monte Carlo simulations. Cryoelectron microscopy demonstrates that the internal structure of the complexes is less ordered than commonly recognized from X-ray diffraction. We have devised a coarse-grained model of self-avoiding flexible tubes mimicking the lipid-coated polyelectrolytes and interacting via a short-range attractive potential. Consistently with cryoelectron microscopy, the resulting clusters obtained through a Monte Carlo scheme exhibit a varying degree of order ranging from weakly organized aggregates to partially organized spooled and straight bundles, depending on the length and on the persistence length of the tubes. These findings may help in the design of self-assembled lipid-based complexes for biomedical and nanotechnological applications.
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Affiliation(s)
- Guillaume Tresset
- †Laboratoire de Physique des Solides, University of Paris-Sud, CNRS, 91405 Orsay, France
| | - Yves Lansac
- ‡Laboratoire d'Electrodynamique des Matériaux Avancés, University François-Rabelais, CNRS, CEA, 37200 Tours, France
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14
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Silalahi ARJ, Boschitsch AH, Harris RC, Fenley MO. Comparing the Predictions of the Nonlinear Poisson-Boltzmann Equation and the Ion Size-Modified Poisson-Boltzmann Equation for a Low-Dielectric Charged Spherical Cavity in an Aqueous Salt Solution. J Chem Theory Comput 2010; 6:3631-3639. [PMID: 22723750 DOI: 10.1021/ct1002785] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ion size-modified Poisson Boltzmann equation (SMPBE) is applied to the simple model problem of a low-dielectric spherical cavity containing a central charge, in an aqueous salt solution to investigate the finite ion size effect upon the electrostatic free energy and its sensitivity to changes in salt concentration. The SMPBE is shown to predict a very different electrostatic free energy than the nonlinear Poisson-Boltzmann equation (NLPBE) due to the additional entropic cost of placing ions in solution. Although the energy predictions of the SMPBE can be reproduced by fitting an appropriatelysized Stern layer, or ion-exclusion layer to the NLPBE calculations, the size of the Stern layer is difficult to estimate a priori. The SMPBE also produces a saturation layer when the central charge becomes sufficiently large. Ion-competition effects on various integrated quantities such the total number of ions predicted by the SMPBE are qualitatively similar to those given by the NLPBE and those found in available experimental results.
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Affiliation(s)
- Alexander R J Silalahi
- Department of Physics and Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306-3408
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15
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Tresset G. The multiple faces of self-assembled lipidic systems. PMC BIOPHYSICS 2009; 2:3. [PMID: 19374753 PMCID: PMC2695813 DOI: 10.1186/1757-5036-2-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Accepted: 04/17/2009] [Indexed: 11/10/2022]
Abstract
Lipids, the building blocks of cells, common to every living organisms, have the propensity to self-assemble into well-defined structures over short and long-range spatial scales. The driving forces have their roots mainly in the hydrophobic effect and electrostatic interactions. Membranes in lamellar phase are ubiquitous in cellular compartments and can phase-separate upon mixing lipids in different liquid-crystalline states. Hexagonal phases and especially cubic phases can be synthesized and observed in vivo as well. Membrane often closes up into a vesicle whose shape is determined by the interplay of curvature, area difference elasticity and line tension energies, and can adopt the form of a sphere, a tube, a prolate, a starfish and many more. Complexes made of lipids and polyelectrolytes or inorganic materials exhibit a rich diversity of structural morphologies due to additional interactions which become increasingly hard to track without the aid of suitable computer models. From the plasma membrane of archaebacteria to gene delivery, self-assembled lipidic systems have left their mark in cell biology and nanobiotechnology; however, the underlying physics is yet to be fully unraveled.PACS Codes: 87.14.Cc, 82.70.Uv.
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Affiliation(s)
- Guillaume Tresset
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France.
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16
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Tresset G. Generalized Poisson-Fermi formalism for investigating size correlation effects with multiple ions. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 78:061506. [PMID: 19256845 DOI: 10.1103/physreve.78.061506] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Revised: 11/21/2008] [Indexed: 05/27/2023]
Abstract
We establish a generalized Poisson-Fermi formalism to compute the electrostatic potential next to charged surfaces in the presence of multiple ion species with different sizes. A generalized Fermi-like ion distribution is deduced from the excess free energy, after expansion of the functional entropy of free space in which the ions have all the same size. The ion distribution is expressed in terms of the bulk volume fractions of each ion species rather than their bulk concentrations so as to account for the excluded volumes. We present size correlations effects such as underscreening and ion stratification, which have not been investigated before with such a simple theory. The change of dielectric properties across the space, arising from the finite spatial occupancy of ions, can be solved self-consistently through the Bruggeman model. The generalized Poisson-Fermi formalism is anticipated to be useful for interpreting electrophoretic mobility measurements and for computing the electrostatic potential over the surface of biomolecules in ionic solutions.
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Affiliation(s)
- Guillaume Tresset
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos 04-01, Singapore 138669.
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17
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Koynova R. Lipid Phases Eye View to Lipofection. Cationic Phosphatidylcholine Derivatives as Efficient DNA Carriers for Gene Delivery. Lipid Insights 2008. [DOI: 10.4137/lpi.s864] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Efficient delivery of genetic material to cells is needed for tasks of utmost importance in laboratory and clinic, such as gene transfection and gene silencing. Synthetic cationic lipids can be used as delivery vehicles for nucleic acids and are now considered the most promising non-viral gene carriers. They form complexes (lipoplexes) with the polyanionic nucleic acids. A critical obstacle for clinical application of the lipid-mediated DNA delivery (lipofection) is its unsatisfactory efficiency for many cell types. Understanding the mechanism of lipid-mediated DNA delivery is essential for their successful application, as well as for rational design and synthesis of novel cationic lipoid compounds for enhanced gene delivery. According to the current understanding, the critical factor in lipid-mediated transfection is the structural evolution of lipoplexes within the cell, upon interacting and mixing with cellular lipids. In particular, recent studies with cationic phosphatidylcholine derivatives showed that the phase evolution of lipoplex lipids upon interaction and mixing with membrane lipids appears to be decisive for transfection success: specifically, lamellar lipoplex formulations, which were readily susceptible to undergoing lamellar-nonlamellar (precisely lamellar-cubic) phase transition upon mixing with cellular lipids, were found rather consistently associated with superior transfection potency, presumably as a result of facilitated DNA release subsequent to lipoplex fusion with the cellular membranes. Further, hydrophobic moiety of the cationic phospholipids was found able to strongly modulate liposomal gene delivery into primary human umbilical artery endothelial cells; superior activity was found for cationic phosphatidylcholine derivatives with two 14-carbon atom monounsaturated hydrocarbon chains, able to induce formation of cubic phase in membranes. Thus, understanding the lipoplex structure and the phase changes upon interacting with membrane lipids is important for the rational design and successful application of cationic lipids as superior nucleotide delivery agents.
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18
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Sundaresan N, Suresh CH, Thomas T, Thomas TJ, Pillai CKS. Liquid Crystalline Phase Behavior of High Molecular Weight DNA: A Comparative Study of the Influence of Metal Ions of Different Size, Charge and Binding Mode. Biomacromolecules 2008; 9:1860-9. [DOI: 10.1021/bm800101x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Neethu Sundaresan
- Chemical Sciences and Technology Division and Computational Modeling and Simulation Section, National Institute for Interdisciplinary Science and Technology (formerly Regional Research Laboratory), Council of Scientific and Industrial Research, Thiruvananthapuram 695019, India, and Departments of Environmental and Occupational Medicine and Medicine, The Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Jersey 08903
| | - Cherumuttathu H. Suresh
- Chemical Sciences and Technology Division and Computational Modeling and Simulation Section, National Institute for Interdisciplinary Science and Technology (formerly Regional Research Laboratory), Council of Scientific and Industrial Research, Thiruvananthapuram 695019, India, and Departments of Environmental and Occupational Medicine and Medicine, The Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Jersey 08903
| | - Thresia Thomas
- Chemical Sciences and Technology Division and Computational Modeling and Simulation Section, National Institute for Interdisciplinary Science and Technology (formerly Regional Research Laboratory), Council of Scientific and Industrial Research, Thiruvananthapuram 695019, India, and Departments of Environmental and Occupational Medicine and Medicine, The Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Jersey 08903
| | - T. J. Thomas
- Chemical Sciences and Technology Division and Computational Modeling and Simulation Section, National Institute for Interdisciplinary Science and Technology (formerly Regional Research Laboratory), Council of Scientific and Industrial Research, Thiruvananthapuram 695019, India, and Departments of Environmental and Occupational Medicine and Medicine, The Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Jersey 08903
| | - C. K. S. Pillai
- Chemical Sciences and Technology Division and Computational Modeling and Simulation Section, National Institute for Interdisciplinary Science and Technology (formerly Regional Research Laboratory), Council of Scientific and Industrial Research, Thiruvananthapuram 695019, India, and Departments of Environmental and Occupational Medicine and Medicine, The Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Jersey 08903
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19
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Tresset G, Cheong WCD, Lam YM. Role of Multivalent Cations in the Self-Assembly of Phospholipid−DNA Complexes. J Phys Chem B 2007; 111:14233-8. [DOI: 10.1021/jp0762830] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guillaume Tresset
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos 04-01, Singapore 138669, Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, and School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, Nanyang Avenue, Singapore 639798
| | - Wun Chet Davy Cheong
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos 04-01, Singapore 138669, Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, and School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, Nanyang Avenue, Singapore 639798
| | - Yeng Ming Lam
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos 04-01, Singapore 138669, Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, and School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, Nanyang Avenue, Singapore 639798
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