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Ubah CS, Pokhrel LR, Williams JE, Akula SM, Richards SL, Kearney GD, Williams A. Antibacterial efficacy, mode of action, and safety of a novel nano-antibiotic against antibiotic-resistant Escherichia coli strains. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 925:171675. [PMID: 38485022 DOI: 10.1016/j.scitotenv.2024.171675] [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: 11/27/2023] [Revised: 02/17/2024] [Accepted: 03/10/2024] [Indexed: 03/23/2024]
Abstract
Globally rising antibiotic-resistant (AR) and multi-drug resistant (MDR) bacterial infections are of public health concern due to treatment failure with current antibiotics. Enterobacteria, particularly Escherichia coli, cause infections of surgical wound, bloodstream, and urinary tract, including pneumonia and sepsis. Herein, we tested in vitro antibacterial efficacy, mode of action (MoA), and safety of novel amino-functionalized silver nanoparticles (NH2-AgNP) against the AR bacteria. Two AR E. coli strains (i.e., ampicillin- and kanamycin-resistant E. coli), including a susceptible strain of E. coli DH5α, were tested for susceptibility to NH2-AgNP using Kirby-Bauer disk diffusion and standard growth assays. Dynamic light scattering (DLS) was used to determine cell debris and relative conductance was used as a measure of cell leakage, and results were confirmed with transmission electron microscopy (TEM). Multiple oxidative stress assays were used for in vitro safety evaluation of NH2-AgNP in human lung epithelial cells. Results showed that ampicillin and kanamycin did not inhibit growth in either AR bacterial strain with doses up to 160 μg/mL tested. NH2-AgNP exhibited broad-spectrum bactericidal activity, inhibiting the growth of all three bacterial strains at doses ≥1 μg/mL. DLS and TEM revealed cell debris formation and cell leakage upon NH2-AgNP treatment, suggesting two possible MoAs: electrostatic interactions followed by cell wall damage. Safety evaluation revealed NH2-AgNP as noncytotoxic and antioxidative to human lung epithelial cells. Taken together, these results suggest that NH2-AgNP may serve as an effective and safer bactericidal therapy against AR bacterial infections compared to common antibiotics.
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Affiliation(s)
- Chukwudi S Ubah
- Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC, USA
| | - Lok R Pokhrel
- Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC, USA.
| | - Jordan E Williams
- Environmental Health Science Program, Department of Health Education and Promotion, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
| | - Shaw M Akula
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, USA
| | - Stephanie L Richards
- Environmental Health Science Program, Department of Health Education and Promotion, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
| | - Gregory D Kearney
- Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC, USA
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2
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Khizar S, Alrushaid N, Alam Khan F, Zine N, Jaffrezic-Renault N, Errachid A, Elaissari A. Nanocarriers based novel and effective drug delivery system. Int J Pharm 2023; 632:122570. [PMID: 36587775 DOI: 10.1016/j.ijpharm.2022.122570] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 12/12/2022] [Accepted: 12/27/2022] [Indexed: 12/30/2022]
Abstract
Nanotechnology has ultimately come into the domain of drug delivery. Nanosystems for delivery of drugs are promptly emerging science utilizing different nanoparticles as carriers. Biocompatible and stable nanocarriers are novel diagnosis tools or therapy agents for explicitly targeting locates with controllable way. Nanocarriers propose numerous advantages to treat diseases via site-specific as well as targeted delivery of particular therapeutics. In recent times, there are number of outstanding nanocarriers use to deliver bio-, chemo-, or immuno- therapeutic agents to obtain effectual therapeutic reactions and to minimalize unwanted adverse-effects. Nanoparticles possess remarkable potential for active drug delivery. Moreover, conjugation of drugs with nanocarriers protects drugs from metabolic or chemical modifications, through their way to targeted cells and hence increased their bioavailability. In this review, various systems integrated with different types of nanocarriers (inorganic. organic, quantum dots, and carbon nanotubes) having different compositions, physical and chemical properties have been discussed for drug delivery applications.
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Affiliation(s)
- Sumera Khizar
- Univ Lyon, University Claude Bernard Lyon-1, CNRS, ISA-UMR 5280, F-69100 Lyon, France
| | - Noor Alrushaid
- Univ Lyon, University Claude Bernard Lyon-1, CNRS, ISA-UMR 5280, F-69100 Lyon, France; Department of Stem Cell Biology, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, Post Box No. 1982, Dammam 31441, Saudi Arabia
| | - Firdos Alam Khan
- Department of Stem Cell Biology, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, Post Box No. 1982, Dammam 31441, Saudi Arabia
| | - Nadia Zine
- Univ Lyon, University Claude Bernard Lyon-1, CNRS, ISA-UMR 5280, F-69100 Lyon, France
| | | | - Abdelhamid Errachid
- Univ Lyon, University Claude Bernard Lyon-1, CNRS, ISA-UMR 5280, F-69100 Lyon, France
| | - Abdelhamid Elaissari
- Univ Lyon, University Claude Bernard Lyon-1, CNRS, ISA-UMR 5280, F-69100 Lyon, France.
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3
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Pokhrel LR, Jacobs ZL, Dikin D, Akula SM. Five nanometer size highly positive silver nanoparticles are bactericidal targeting cell wall and adherent fimbriae expression. Sci Rep 2022; 12:6729. [PMID: 35468937 PMCID: PMC9039075 DOI: 10.1038/s41598-022-10778-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 04/08/2022] [Indexed: 12/20/2022] Open
Abstract
To tackle growing antibiotic resistance (AR) and hospital-acquired infections (HAIs), novel antimicrobials are warranted that are effective against HAIs and safer for human use. We hypothesize that small 5 nm size positively charged nanoparticles could specifically target bacterial cell wall and adherent fimbriae expression, serving as the next generation antibacterial agent. Herein we show highly positively charged, 5 nm amino-functionalized silver nanoparticles (NH2–AgNPs) were bactericidal; highly negatively charged, 45 nm citrate-functionalized AgNPs (Citrate–AgNPs) were nontoxic; and Ag+ ions were bacteriostatic forming honeycomb-like potentially resistant phenotype, at 10 µg Ag/mL in E. coli. Further, adherent fimbriae were expressed with Citrate–AgNPs (0.5–10 µg/mL), whereas NH2–AgNPs (0.5–10 µg/mL) or Ag+ ions (only at 10 µg/mL) inhibited fimbriae expression. Our results also showed no lipid peroxidation in human lung epithelial and dermal fibroblast cells upon NH2–AgNPs treatments, suggesting NH2–AgNPs as a biocompatible antibacterial candidate. Potent bactericidal effects demonstrated by biocompatible NH2–AgNPs and the lack of toxicity of Citrate–AgNPs lend credence to the hypothesis that small size, positively charged AgNPs may serve as a next-generation antibacterial agent, potentially addressing the rising HAIs and patient health and safety.
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Affiliation(s)
- Lok R Pokhrel
- Department of Public Health, The Brody School of Medicine, East Carolina University, Greenville, NC, USA.
| | - Zachary L Jacobs
- School of Law, University of California, Berkeley, Berkeley, CA, USA
| | - Dmitriy Dikin
- Department of Mechanical Engineering, College of Engineering, Temple University, Philadelphia, PA, USA
| | - Shaw M Akula
- Department of Microbiology and Immunology, The Brody School of Medicine, East Carolina University, Greenville, NC, USA
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4
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Davoodi H, Sorinezami Z, Moghaddam MG, Khajeh M, Keshavarzi A, Ghanbari D. Smart Peptide/Au Nano-carriers for Drug Delivery Systems: Synthesis and Characterization, Interactions with Calf Thymus DNA, and In Vitro Cytotoxicity Studies. J CLUST SCI 2022. [DOI: 10.1007/s10876-022-02229-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Arribas Perez M, Beales PA. Biomimetic Curvature and Tension-Driven Membrane Fusion Induced by Silica Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13917-13931. [PMID: 34788054 DOI: 10.1021/acs.langmuir.1c02492] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Fusion events in living cells are intricate phenomena that require the coordinate action of multicomponent protein complexes. However, simpler synthetic tools to control membrane fusion in artificial cells are highly desirable. Native membrane fusion machinery mediates fusion, driving a delicate balance of membrane curvature and tension between two closely apposed membranes. Here, we show that silica nanoparticles (SiO2 NPs) at a size close to the cross-over between tension-driven and curvature-driven interaction regimes initiate efficient fusion of biomimetic model membranes. Fusion efficiency and mechanisms are studied by Förster resonance energy transfer and confocal fluorescence microscopy. SiO2 NPs induce a slight increase in lipid packing likely to increase the lateral tension of the membrane. We observe a connection between membrane tension and fusion efficiency. Finally, real-time confocal fluorescence microscopy reveals three distinct mechanistic pathways for membrane fusion. SiO2 NPs show significant potential for inclusion in the synthetic biology toolkit for membrane remodeling and fusion in artificial cells.
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Affiliation(s)
- Marcos Arribas Perez
- Astbury Centre for Structural Molecular Biology and School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Paul A Beales
- Astbury Centre for Structural Molecular Biology and School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
- Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, U.K
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6
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Fleury JB, Werner M, Guével XL, Baulin VA. Protein corona modulates interaction of spiky nanoparticles with lipid bilayers. J Colloid Interface Sci 2021; 603:550-558. [PMID: 34216951 DOI: 10.1016/j.jcis.2021.06.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 05/23/2021] [Accepted: 06/07/2021] [Indexed: 10/21/2022]
Abstract
The impact of protein corona on the interactions of nanoparticles (NPs) with cells remains an open question. This question is particularly relevant to NPs which sizes, ranging from tens to hundreds nanometers, are comparable to the sizes of most abundant proteins in plasma. Protein sizes match with typical thickness of various coatings and ligands layers, usually present at the surfaces of larger NPs. Such size match may affect the properties and the designed function of NPs. We offer a direct demonstration of how protein corona can dramatically change the interaction mode between NPs and lipid bilayers. To this end, we choose the most extreme case of NP surface modification: nanostructures in the form of rigid spikes of 10-20 nm length at the surface of gold nanoparticles. In the absence of proteins we observe the formation of reversible pores when spiky NPs adsorb on lipid bilayers. In contrast, the presence of bovine serum albumin (BSA) proteins adsorbed at the surface of spiked NPs, effectively reduces the length of spikes exposed to the interaction with lipid bilayers. Thus, protein corona changes qualitatively the dynamics of pore formation, which is completely suppressed at high protein concentrations. These results suggest that protein corona can not only be critical for interaction of NPs with membranes, it may change their mode of interaction, thus offsetting the role of surface chemistry and ligands.
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Affiliation(s)
- Jean-Baptiste Fleury
- Experimental Physics and Center for Biophysics, Universitat des Saarlandes, 66123 Saarbruecken, Germany.
| | - Marco Werner
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany
| | - Xavier Le Guével
- Cancer Targets & Experimental Therapeutics, Institute for Advanced Biosciences (IAB), University of Grenoble Alpes, INSERM U1209, CNRS UMR 5309, 38000 Grenoble, France
| | - Vladimir A Baulin
- Departament Química Física i Inorgánica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, 43007 Tarragona, Spain.
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7
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William N, Bamidoro F, Beales PA, Drummond-Brydson R, Hondow N, Key S, Kulak A, Walsh AC, Winter S, Nelson LA. Tuning stable noble metal nanoparticles dispersions to moderate their interaction with model membranes. J Colloid Interface Sci 2021; 594:101-112. [PMID: 33756358 DOI: 10.1016/j.jcis.2021.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/26/2021] [Accepted: 03/01/2021] [Indexed: 12/19/2022]
Abstract
HYPOTHESIS The properties of stable gold (Au) nanoparticle dispersions can be tuned to alter their activity towards biomembrane models. EXPERIMENTS Au nanoparticle coating techniques together with rapid electrochemical screens of a phospholipid layer on fabricated mercury (Hg) on platinum (Pt) electrode have been used to moderate the phospholipid layer activity of Au nanoparticle dispersions. Screening results for Au nanoparticle dispersions were intercalibrated with phospholipid large unilamellar vesicle (LUV) interactions using a carboxyfluorescein (CF) leakage assay. All nanoparticle dispersions were characterised for size, by dynamic light scattering (DLS) and transmission electron microscopy (TEM). FINDINGS Commercial and high quality home synthesised Au nanoparticle dispersions are phospholipid monolayer active whereas Ag nanoparticle dispersions are not. If Au nanoparticles are coated with a thin layer of Ag then the particle/lipid interaction is suppressed. The electrochemical assays of the lipid layer activity of Au nanoparticle dispersions align with LUV leakage assays of the same. Au nanoparticles of decreasing size and increasing dispersion concentration showed a stronger phospholipid monolayer/bilayer interaction. Treating Au nanoparticles with cell culture medium and incubation of Au nanoparticle dispersions in phosphate buffered saline (PBS) solutions removes their phospholipid layer interaction.
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Affiliation(s)
- Nicola William
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
| | - Faith Bamidoro
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
| | - Paul A Beales
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK; Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, UK; Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Rik Drummond-Brydson
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK; Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, UK
| | - Nicole Hondow
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK; Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, UK
| | - Sarah Key
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
| | | | | | - Sophia Winter
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
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8
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Linklater DP, Baulin VA, Le Guével X, Fleury JB, Hanssen E, Nguyen THP, Juodkazis S, Bryant G, Crawford RJ, Stoodley P, Ivanova EP. Antibacterial Action of Nanoparticles by Lethal Stretching of Bacterial Cell Membranes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2005679. [PMID: 33179362 DOI: 10.1002/adma.202005679] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 10/05/2020] [Indexed: 06/11/2023]
Abstract
It is commonly accepted that nanoparticles (NPs) can kill bacteria; however, the mechanism of antimicrobial action remains obscure for large NPs that cannot translocate the bacterial cell wall. It is demonstrated that the increase in membrane tension caused by the adsorption of NPs is responsible for mechanical deformation, leading to cell rupture and death. A biophysical model of the NP-membrane interactions is presented which suggests that adsorbed NPs cause membrane stretching and squeezing. This general phenomenon is demonstrated experimentally using both model membranes and Pseudomonas aeruginosa and Staphylococcus aureus, representing Gram-positive and Gram-negative bacteria. Hydrophilic and hydrophobic quasi-spherical and star-shaped gold (Au)NPs are synthesized to explore the antibacterial mechanism of non-translocating AuNPs. Direct observation of nanoparticle-induced membrane tension and squeezing is demonstrated using a custom-designed microfluidic device, which relieves contraction of the model membrane surface area and eventual lipid bilayer collapse. Quasi-spherical nanoparticles exhibit a greater bactericidal action due to a higher interactive affinity, resulting in greater membrane stretching and rupturing, corroborating the theoretical model. Electron microscopy techniques are used to characterize the NP-bacterial-membrane interactions. This combination of experimental and theoretical results confirm the proposed mechanism of membrane-tension-induced (mechanical) killing of bacterial cells by non-translocating NPs.
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Affiliation(s)
- Denver P Linklater
- School of Science, RMIT University, P.O. Box 2476, Melbourne, Victoria, 3001, Australia
- Opical Sciences Centre, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia
| | - Vladimir A Baulin
- Department d'Enginyeria Quimica, Universitat Rovira i Virgili, 26 Av. dels Paisos Catalans, Tarragona, 43007, Spain
| | - Xavier Le Guével
- Insitute for Advanced Biosciences, University Grenoble-Alpes, Allee des Alpes, La Tronche, 38700, France
| | - Jean-Baptiste Fleury
- Experimental Physics and Center for Biophysics, Saarland University, Saarbrücken, 66123, Germany
| | - Eric Hanssen
- Ian Holmes Imaging Centre, Bio21 Institute, University of Melbourne, 30 Flemington Rd, Parkville, Victoria, 3010, Australia
| | - The Hong Phong Nguyen
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, 700000, Vietnam
| | - Saulius Juodkazis
- Opical Sciences Centre, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia
| | - Gary Bryant
- School of Science, RMIT University, P.O. Box 2476, Melbourne, Victoria, 3001, Australia
| | - Russell J Crawford
- School of Science, RMIT University, P.O. Box 2476, Melbourne, Victoria, 3001, Australia
| | - Paul Stoodley
- Infectious Diseases Institute, The Ohio State University, 716 Biomedical Research Tower, 460 West 12th Avenue, Columbus, OH, 43210, USA
- National Centre for Advanced Tribology at Southampton (nCATS), National Biofilm Innovation Centre (NBIC), Mechanical Engineering, University of Southampton, Southampton, SO17 1Bj, UK
| | - Elena P Ivanova
- School of Science, RMIT University, P.O. Box 2476, Melbourne, Victoria, 3001, Australia
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9
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Sheavly JK, Lehn RC. Bilayer‐mediated assembly of cationic nanoparticles adsorbed to lipid bilayers: Insights from molecular simulations. AIChE J 2020. [DOI: 10.1002/aic.16993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jonathan K. Sheavly
- Department of Chemical and Biological Engineering University of Wisconsin‐Madison Madison Wisconsin USA
| | - Reid C. Lehn
- Department of Chemical and Biological Engineering University of Wisconsin‐Madison Madison Wisconsin USA
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10
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Yu Q, Dasgupta S, Auth T, Gompper G. Osmotic Concentration-Controlled Particle Uptake and Wrapping-Induced Lysis of Cells and Vesicles. NANO LETTERS 2020; 20:1662-1668. [PMID: 32046489 DOI: 10.1021/acs.nanolett.9b04788] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In vivo, high protein and ion concentrations determine the preferred volumes of cells, organelles, and vesicles. Deformations of their lipid-bilayer membranes by nanoparticle wrapping reduce the interior volumes available to solutes and thus induce large osmotic pressure differences. Osmotic concentration can therefore be an important control parameter for wrapping of nanoparticles. We employ a curvature-elasticity model of the membrane and contact interaction with spherical particles to study their wrapping at initially spherical vesicles. Although the continuous particle-binding transition is independent of the presence of solutes, the discontinuous envelopment transition shifts to higher adhesion strengths and the corresponding energy barrier increases with increasing osmotic concentration. High osmotic concentrations stabilize partial-wrapped, membrane-bound states for both, particle attachment to the inside and the outside. In this regime, wrapping of particles controls membrane tension, with power-law dependencies on osmotic concentration and adhesion strength. For high adhesion strengths, particle wrapping can lead to the opening of mechanosensitive channels in cell membranes and to lysis. Membrane tension-induced stabilization of partial-wrapped states as well as wrapping-induced lysis play important roles not only for desired mechano-bacteriocidal effects of engineered nanomaterials but may also determine viral burst sizes of bacteria and control endocytosis for mammalian cells.
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Affiliation(s)
- Qingfen Yu
- Theoretical Soft Matter and Biophysics, Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Sabyasachi Dasgupta
- Theoretical Soft Matter and Biophysics, Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
- Mechanobiology Institute, National University of Singapore, 11899, Singapore
| | - Thorsten Auth
- Theoretical Soft Matter and Biophysics, Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Gerhard Gompper
- Theoretical Soft Matter and Biophysics, Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
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11
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Noh SY, Nash A, Notman R. The aggregation of striped nanoparticles in mixed phospholipid bilayers. NANOSCALE 2020; 12:4868-4881. [PMID: 31916561 DOI: 10.1039/c9nr07106g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The unique and adjustable properties of nanoparticles present enormous opportunities for their use as targeted drug delivery vectors. For example, nanoparticles functionalized with key surface ligands have been shown to pass through phospholipid bilayers without causing localised disruption. However, the further effects nanoparticles have on multi-component phospholipid bilayers remain unclear. We use coarse-grained computational models to investigate the structural properties of mixed phospholipid bilayers in the presence of ligand-functionalized nanoparticles. Model bilayers are composed of DPPC, DUPC, DFPC and cholesterol, and the nanoparticles are striped with a hydrophobic-ligand band and charged-ligand spherical caps. Our results show that nanoparticles aggregate near unsaturated phospholipid regions, phospholipid bilayer phase-separation is promoted in the presence of nanoparticles, and the heterogeneous components of a phospholipid bilayer play a significant role in the lateral organization of nanoparticles. This study highlights the need for considering the complexity of realistic phospholipid bilayers when optimising ligand functionalized nanoparticles for efficient drug delivery vectors.
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Affiliation(s)
- Sang Young Noh
- Department of Chemistry, University of Warwick, Coventry, UK.
| | - Anthony Nash
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Rebecca Notman
- Department of Chemistry, University of Warwick, Coventry, UK.
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12
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Arribas Perez M, Moriones OH, Bastús NG, Puntes V, Nelson A, Beales PA. Mechanomodulation of Lipid Membranes by Weakly Aggregating Silver Nanoparticles. Biochemistry 2019; 58:4761-4773. [DOI: 10.1021/acs.biochem.9b00390] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcos Arribas Perez
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
- Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K
| | - Oscar H. Moriones
- Institut Català de Nanociència y Nanotecnologia (ICN2), Campus UAB, 08193 Bellaterra, Barcelona, Spain
- Universitat Autonòma de Barcelona (UAB), Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - Neus G. Bastús
- Institut Català de Nanociència y Nanotecnologia (ICN2), Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - Victor Puntes
- Institut Català de Nanociència y Nanotecnologia (ICN2), Campus UAB, 08193 Bellaterra, Barcelona, Spain
- Universitat Autonòma de Barcelona (UAB), Campus UAB, 08193 Bellaterra, Barcelona, Spain
- Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
| | - Andrew Nelson
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Paul A. Beales
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
- Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K
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13
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Van Lehn RC, Alexander-Katz A. Energy landscape for the insertion of amphiphilic nanoparticles into lipid membranes: A computational study. PLoS One 2019; 14:e0209492. [PMID: 30625163 PMCID: PMC6326551 DOI: 10.1371/journal.pone.0209492] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 11/30/2018] [Indexed: 11/19/2022] Open
Abstract
Amphiphilic, monolayer-protected gold nanoparticles (NPs) have been shown to enter cells via a non-endocytic, non-disruptive pathway that could be valuable for biomedical applications. The same NPs were also found to insert into a series of model cell membranes as a precursor to cellular uptake, but the insertion mechanism remains unclear. Previous simulations have demonstrated that an amphiphilic NP can insert into a single leaflet of a planar lipid bilayer, but in this configuration all charged end groups are localized to one side of the bilayer and it is unknown if further insertion is thermodynamically favorable. Here, we use atomistic molecular dynamics simulations to show that an amphiphilic NP can reach the bilayer midplane non-disruptively if charged ligands iteratively "flip" across the bilayer. Ligand flipping is a favorable process that relaxes bilayer curvature, decreases the nonpolar solvent-accessible surface area of the NP monolayer, and increases attractive ligand-lipid electrostatic interactions. Analysis of end group hydration further indicates that iterative ligand flipping can occur on experimentally relevant timescales. Supported by these results, we present a complete energy landscape for the non-disruptive insertion of amphiphilic NPs into lipid bilayers. These findings will help guide the design of NPs to enhance bilayer insertion and non-endocytic cellular uptake, and also provide physical insight into a possible pathway for the translocation of charged biomacromolecules.
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Affiliation(s)
- Reid C. Van Lehn
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI, United States of America
| | - Alfredo Alexander-Katz
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States of America
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