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Sharma A, Negi G, Chaudhary M, Parveen N. Kinetics of Ganglioside-Rich Supported Lipid Bilayer Formation with Tracer Vesicle Fluorescence Imaging. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11694-11707. [PMID: 37552772 DOI: 10.1021/acs.langmuir.3c01301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Gangliosides, forming a class of lipids complemented by sugar chains, influence the lateral distribution of membrane proteins or membrane-binding proteins, act as receptors for viruses and bacterial toxins, and mediate several types of cellular signaling. Gangliosides incorporated into supported lipid bilayers (SLBs) have been widely applied as a model system to examine these biological processes. In this work, we explored how ganglioside composition affects the kinetics of SLB formation using the vesicle rupturing method on a solid surface. We imaged the attachment of vesicles and the subsequent SLB formation using the time-lapse total internal reflection fluorescence microscopy technique. In the early phase, the ganglioside type and concentration influence the adsorption kinetics of vesicles and their residence/lifetime on the surface before rupturing. Our data confirm that a simultaneous rupturing of neighboring surface-adsorbed vesicles forms microscopic lipid patches on the surface and it is triggered by a critical coverage of the vesicles independent of their composition. In the SLB growth phase, lipid patches merge, forming a continuous SLB. The propagation of patch edges catalyzes the process and depends on the ganglioside type. Our pH-dependent experiments confirm that the polar/charged head groups of the gangliosides have a critical role in these steps and phases of SLB formation kinetics.
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Affiliation(s)
- Anurag Sharma
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
| | - Geetanjali Negi
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
| | - Monika Chaudhary
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
| | - Nagma Parveen
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
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2
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Negi G, Sharma A, Chaudhary M, Gupta D, Harshan KH, Parveen N. SARS-CoV-2 Binding to Terminal Sialic Acid of Gangliosides Embedded in Lipid Membranes. ACS Infect Dis 2023; 9:1346-1361. [PMID: 37145972 DOI: 10.1021/acsinfecdis.3c00106] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Multiple recent reports indicate that the S protein of SARS-CoV-2 specifically interacts with membrane receptors and attachment factors other than ACE2. They likely have an active role in cellular attachment and entry of the virus. In this article, we examined the binding of SARS-CoV-2 particles to gangliosides embedded in supported lipid bilayers (SLBs), mimicking the cell membrane-like environment. We show that the virus specifically binds to sialylated (sialic acid (SIA)) gangliosides, i.e., GD1a, GM3, and GM1, as determined from the acquired single-particle fluorescence images using a time-lapse total internal reflection fluorescence (TIRF) microscope. The data of virus binding events, the apparent binding rate constant, and the maximum virus coverage on the ganglioside-rich SLBs show that the virus particles have a higher binding affinity toward the GD1a and GM3 compared to the GM1 ganglioside. Enzymatic hydrolysis of the SIA-Gal bond of the gangliosides confirms that the SIA sugar unit of GD1a and GM3 is essential for virus attachment to the SLBs and even the cell surface sialic acid is critical for the cellular attachment of the virus. The structural difference between GM3/GD1a and GM1 is the presence of SIA at the main or branched chain. We conclude that the number of SIA per ganglioside can weakly influence the initial binding rate of SARS-CoV-2 particles, whereas the terminal or more exposed SIA is critical for the virus binding to the gangliosides in SLBs.
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Affiliation(s)
- Geetanjali Negi
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
| | - Anurag Sharma
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
| | - Monika Chaudhary
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
| | - Divya Gupta
- CSIR-Centre for Cellular and Molecular Biology, 500007 Hyderabad, India
| | - Krishnan H Harshan
- CSIR-Centre for Cellular and Molecular Biology, 500007 Hyderabad, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Nagma Parveen
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016 Kanpur, India
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3
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Norling K, Sjöberg M, Bally M, Zhdanov VP, Parveen N, Höök F. Dissimilar Deformation of Fluid- and Gel-Phase Liposomes upon Multivalent Interaction with Cell Membrane Mimics Revealed Using Dual-Wavelength Surface Plasmon Resonance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2550-2560. [PMID: 35156833 PMCID: PMC8892953 DOI: 10.1021/acs.langmuir.1c03096] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The mechanical properties of biological nanoparticles play a crucial role in their interaction with the cellular membrane, in particular for cellular uptake. This has significant implications for the design of pharmaceutical carrier particles. In this context, liposomes have become increasingly popular, among other reasons due to their customizability and easily varied physicochemical properties. With currently available methods, it is, however, not trivial to characterize the mechanical properties of nanoscopic liposomes especially with respect to the level of deformation induced upon their ligand-receptor-mediated interaction with laterally fluid cellular membranes. Here, we utilize the sensitivity of dual-wavelength surface plasmon resonance to probe the size and shape of bound liposomes (∼100 nm in diameter) as a means to quantify receptor-induced deformation during their interaction with a supported cell membrane mimic. By comparing biotinylated liposomes in gel and fluid phases, we demonstrate that fluid-phase liposomes are more prone to deformation than their gel-phase counterparts upon binding to the cell membrane mimic and that, as expected, the degree of deformation depends on the number of ligand-receptor pairs that are engaged in the multivalent binding.
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Affiliation(s)
- Karin Norling
- Division
of Nano and Biophysics, Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Mattias Sjöberg
- Division
of Nano and Biophysics, Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Marta Bally
- Department
of Clinical Microbiology, Umeå University, 901 85 Umeå, Sweden
- Wallenberg
Centre for Molecular Medicine, Umeå
University, 901 85 Umeå, Sweden
| | - Vladimir P. Zhdanov
- Division
of Nano and Biophysics, Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
- Boreskov
Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Nagma Parveen
- Division
of Nano and Biophysics, Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
- (N.P.)
| | - Fredrik Höök
- Division
of Nano and Biophysics, Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
- (F.H.)
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4
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Bally M, Block S, Höök F, Larson G, Parveen N, Rydell GE. Physicochemical tools for studying virus interactions with targeted cell membranes in a molecular and spatiotemporally resolved context. Anal Bioanal Chem 2021; 413:7157-7178. [PMID: 34490501 PMCID: PMC8421089 DOI: 10.1007/s00216-021-03510-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/23/2021] [Accepted: 06/28/2021] [Indexed: 12/14/2022]
Abstract
The objective of this critical review is to provide an overview of how emerging bioanalytical techniques are expanding our understanding of the complex physicochemical nature of virus interactions with host cell surfaces. Herein, selected model viruses representing both non-enveloped (simian virus 40 and human norovirus) and enveloped (influenza A virus, human herpes simplex virus, and human immunodeficiency virus type 1) viruses are highlighted. The technologies covered utilize a wide range of cell membrane mimics, from supported lipid bilayers (SLBs) containing a single purified host membrane component to SLBs derived from the plasma membrane of a target cell, which can be compared with live-cell experiments to better understand the role of individual interaction pairs in virus attachment and entry. These platforms are used to quantify binding strengths, residence times, diffusion characteristics, and binding kinetics down to the single virus particle and single receptor, and even to provide assessments of multivalent interactions. The technologies covered herein are surface plasmon resonance (SPR), quartz crystal microbalance with dissipation (QCM-D), dynamic force spectroscopy (DFS), total internal reflection fluorescence (TIRF) microscopy combined with equilibrium fluctuation analysis (EFA) and single particle tracking (SPT), and finally confocal microscopy using multi-labeling techniques to visualize entry of individual virus particles in live cells. Considering the growing scientific and societal needs for untangling, and interfering with, the complex mechanisms of virus binding and entry, we hope that this review will stimulate the community to implement these emerging tools and strategies in conjunction with more traditional methods. The gained knowledge will not only contribute to a better understanding of the virus biology, but may also facilitate the design of effective inhibitors to block virus entry.
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Affiliation(s)
- Marta Bally
- Department of Clinical Microbiology & Wallenberg Centre for Molecular Medicine, Umeå University, 901 85, Umeå, Sweden
| | - Stephan Block
- Department of Chemistry and Biochemistry, Freie Universität Berlin, 14195, Berlin, Germany
| | - Fredrik Höök
- Department of Physics, Chalmers University of Technology, 412 96, Gothenburg, Sweden.
| | - Göran Larson
- Department of Laboratory Medicine, Sahlgrenska Academy at the University of Gothenburg, Sahlgrenska University Hospital, Bruna Stråket 16, 413 45, Gothenburg, Sweden.
| | - Nagma Parveen
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Gustaf E Rydell
- Department of Infectious Diseases, Sahlgrenska Academy at the University of Gothenburg, 413 46, Gothenburg, Sweden
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5
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Park H, Sut TN, Yoon BK, Zhdanov VP, Cho NJ, Jackman JA. Unraveling How Multivalency Triggers Shape Deformation of Sub-100 nm Lipid Vesicles. J Phys Chem Lett 2021; 12:6722-6729. [PMID: 34263601 DOI: 10.1021/acs.jpclett.1c01510] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Multivalent ligand-receptor interactions are critical to the function of membrane-enveloped biological and biomimetic nanoparticles, yet resulting nanoparticle shape changes are rarely investigated. Using the localized surface plasmon resonance (LSPR) sensing technique, we tracked the attachment of biotinylated, sub-100 nm lipid vesicles to a streptavidin-functionalized supported lipid bilayer (SLB) and developed an analytical model to extract quantitative details about the vesicle-SLB contact region. The experimental results were supported by theoretical analyses of biotin-streptavidin complex formation and corresponding structural and energetic aspects of vesicle deformation. Our findings reveal how varying the surface densities of streptavidin receptors in the SLB and biotin ligands in the vesicles affects the extent of nanometer-scale vesicle deformation. We also identify conditions, i.e., a critical ligand density, at which appreciable vesicle deformation began, which provides insight into how the membrane bending energy partially counterposes the multivalent binding interaction energy. These findings are generalizable to various multivalent ligand-receptor systems.
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Affiliation(s)
- Hyeonjin Park
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Tun Naw Sut
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Bo Kyeong Yoon
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Vladimir P Zhdanov
- Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Joshua A Jackman
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
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6
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Zhdanov VP. Competitive multivalent coadsorption and desorption of biological nanoparticles on a supported lipid bilayer. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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7
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Jordan LR, Blauch ME, Baxter AM, Cawley JL, Wittenberg NJ. Influence of brain gangliosides on the formation and properties of supported lipid bilayers. Colloids Surf B Biointerfaces 2019; 183:110442. [DOI: 10.1016/j.colsurfb.2019.110442] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 07/30/2019] [Accepted: 08/15/2019] [Indexed: 01/04/2023]
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8
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Parveen N, Rydell GE, Larson G, Hytönen VP, Zhdanov VP, Höök F, Block S. Competition for Membrane Receptors: Norovirus Detachment via Lectin Attachment. J Am Chem Soc 2019; 141:16303-16311. [PMID: 31533424 DOI: 10.1021/jacs.9b06036] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Virus internalization into the host cells occurs via multivalent interactions, in which a single virus binds to multiple receptors in parallel. Because of analytical and experimental limitations this complex type of interaction is still poorly understood and quantified. Herein, the multivalent interaction of norovirus-like particles (noroVLPs) with H or B type 1 glycosphingolipids (GSLs), embedded in a supported phospholipid bilayer, is investigated by following the competition between noroVLPs and a lectin (from Ralstonia solanacearum) upon binding to these GSLs. Changes in noroVLP and lectin coverage, caused by competition, were monitored for both GSLs and at different GSL concentrations using quartz crystal microbalance with dissipation monitoring. The study yields information about the minimum GSL concentration needed for (i) noroVLPs to achieve firm attachment to the bilayer prior to competition and to (ii) remain firmly attached to the bilayer during competition. We show that these two concentrations are almost identical for the H type 1-noroVLP interaction but differ for B type 1, indicating an accumulation of B type 1 GSLs in the noroVLP-bilayer interaction area. Furthermore, the GSL concentration required for firm attachment is significantly larger for H type 1 than for B type 1, indicating a higher affinity of noroVLP toward B type 1. This finding is supported by extracting the energy of single noroVLP-H type 1 and noroVLP-B type 1 bonds from the competition kinetics, which were estimated to be 5 and 6 kcal/mol, respectively. This demonstrates the potential of utilizing competitive binding kinetics to analyze multivalent interactions, which has remained difficult to quantify using conventional approaches.
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Affiliation(s)
- Nagma Parveen
- Department of Physics , Chalmers University of Technology , Gothenburg , Sweden.,Laboratory for Photochemistry and Spectroscopy, Department of Chemistry , KU Leuven , Leuven , Belgium
| | - Gustaf E Rydell
- Department of Infectious Diseases, Sahlgrenska Academy , University of Gothenburg , Gothenburg , Sweden
| | - Göran Larson
- Department of Laboratory Medicine, Sahlgrenska Academy , University of Gothenburg , Gothenburg , Sweden
| | - Vesa P Hytönen
- Faculty of Medicine and Health Technology and BioMediTech , Tampere University , Tampere, Finland and Fimlab Laboratories , Tampere , Finland
| | - Vladimir P Zhdanov
- Department of Physics , Chalmers University of Technology , Gothenburg , Sweden.,Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk , Russia
| | - Fredrik Höök
- Department of Physics , Chalmers University of Technology , Gothenburg , Sweden
| | - Stephan Block
- Department of Physics , Chalmers University of Technology , Gothenburg , Sweden.,Department of Chemistry and Biochemistry , Freie Universität Berlin , Berlin , Germany
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9
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Müller M, Lauster D, Wildenauer HHK, Herrmann A, Block S. Mobility-Based Quantification of Multivalent Virus-Receptor Interactions: New Insights Into Influenza A Virus Binding Mode. NANO LETTERS 2019; 19:1875-1882. [PMID: 30719917 DOI: 10.1021/acs.nanolett.8b04969] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Viruses, such as influenza A, typically bind to the plasma membrane of their host by engaging multiple membrane receptors in parallel, thereby forming so-called multivalent interactions that are created by the collective action of multiple weak ligand-receptor bonds. The overall interaction strength can be modulated by changing the number of engaged receptors. This feature is used by viruses to achieve a sufficiently firm attachment to the host's plasma membrane but also allows progeny viruses to leave the plasma membrane after completing the virus replication cycle. Design of strategies to prevent infection, for example, by disturbing these attachment and detachment processes upon application of antivirals, requires quantification of the underlying multivalent interaction in absence and presence of antivirals. This is still an unresolved problem, as there is currently no approach available that allows for determining the valency (i.e., of the number of receptors bound to a particular virus) on the level of single viruses under equilibrium conditions. Herein, we track the motion of single influenza A/X31 viruses (IAVs; interacting with the ganglioside GD1a incorporated in a supported lipid bilayer) using total internal reflection fluorescence microscopy and show that IAV residence time distributions can be deconvoluted from valency effects by taking the IAV mobility into account. The so-derived off-rate distributions, expressed in dependence of an average, apparent valency, show the expected decrease in off-rate with increasing valency but also show an unexpected peak structure, which can be linked to a competition in the opposing functionalities of the two influenza A virus spike proteins, hemagglutinin (HA), and neuraminidase (NA). By application of the antiviral zanamivir that inhibits the activity of NA, we provide direct evidence, how the HA/NA balance modulates this virus-receptor interaction, allowing us to assess the inhibition concentration of zanamivir based on its effect on the multivalent interaction.
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Affiliation(s)
- Matthias Müller
- Department of Chemistry and Biochemistry, Emmy-Noether Group "Bionanointerfaces" , Freie Universität Berlin , Takustrasse 3 , 14195 Berlin , Germany
| | - Daniel Lauster
- Department of Biology, Molecular Biophysics , Humboldt-Universität zu Berlin, IRI Life Sciences , Invalidenstr. 42 , 10115 Berlin , Germany
| | - Helen H K Wildenauer
- Department of Chemistry and Biochemistry, Emmy-Noether Group "Bionanointerfaces" , Freie Universität Berlin , Takustrasse 3 , 14195 Berlin , Germany
| | - Andreas Herrmann
- Department of Biology, Molecular Biophysics , Humboldt-Universität zu Berlin, IRI Life Sciences , Invalidenstr. 42 , 10115 Berlin , Germany
| | - Stephan Block
- Department of Chemistry and Biochemistry, Emmy-Noether Group "Bionanointerfaces" , Freie Universität Berlin , Takustrasse 3 , 14195 Berlin , Germany
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10
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Lanfranco R, Jana PK, Tunesi L, Cicuta P, Mognetti BM, Di Michele L, Bruylants G. Kinetics of Nanoparticle-Membrane Adhesion Mediated by Multivalent Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2002-2012. [PMID: 30636419 DOI: 10.1021/acs.langmuir.8b02707] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Multivalent adhesive interactions mediated by a large number of ligands and receptors underpin many biological processes, including cell adhesion and the uptake of particles, viruses, parasites, and nanomedical vectors. In materials science, multivalent interactions between colloidal particles have enabled unprecedented control over the phase behavior of self-assembled materials. Theoretical and experimental studies have pinpointed the relationship between equilibrium states and microscopic system parameters such as the ligand-receptor binding strength and their density. In regimes of strong interactions, however, kinetic factors are expected to slow down equilibration and lead to the emergence of long-lived out-of-equilibrium states that may significantly influence the outcome of self-assembly experiments and the adhesion of particles to biological membranes. Here we experimentally investigate the kinetics of adhesion of nanoparticles to biomimetic lipid membranes. Multivalent interactions are reproduced by strongly interacting DNA constructs, playing the role of both ligands and receptors. The rate of nanoparticle adhesion is investigated as a function of the surface density of membrane-anchored receptors and the bulk concentration of nanoparticles and is observed to decrease substantially in regimes where the number of available receptors is limited compared to the overall number of ligands. We attribute such peculiar behavior to the rapid sequestration of available receptors after initial nanoparticle adsorption. The experimental trends and the proposed interpretation are supported by numerical simulations.
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Affiliation(s)
- Roberta Lanfranco
- Biological and Soft Systems, Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
- Université Libre de Bruxelles (ULB) , Engineering of Molecular NanoSystems , 50 av. F.D. Roosevelt , 1050 Brussels , Belgium
| | - Pritam Kumar Jana
- Université Libre de Bruxelles (ULB) , Interdisciplinary Center for Nonlinear Phenomena and Complex Systems, Campus Plaine , CP 231, Blvd. du Triomphe , B-1050 Brussels , Belgium
| | - Lucia Tunesi
- Biological and Soft Systems, Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Pietro Cicuta
- Biological and Soft Systems, Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Bortolo Matteo Mognetti
- Université Libre de Bruxelles (ULB) , Interdisciplinary Center for Nonlinear Phenomena and Complex Systems, Campus Plaine , CP 231, Blvd. du Triomphe , B-1050 Brussels , Belgium
| | - Lorenzo Di Michele
- Biological and Soft Systems, Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Gilles Bruylants
- Université Libre de Bruxelles (ULB) , Engineering of Molecular NanoSystems , 50 av. F.D. Roosevelt , 1050 Brussels , Belgium
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11
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Abstiens K, Gregoritza M, Goepferich AM. Ligand Density and Linker Length are Critical Factors for Multivalent Nanoparticle-Receptor Interactions. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1311-1320. [PMID: 30521749 DOI: 10.1021/acsami.8b18843] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Although there are a large number of studies available for the evaluation of the therapeutic efficacy of targeted polymeric nanoparticles, little is known about the critical attributes that can further influence their uptake into target cells. In this study, varying cRGD ligand densities (0-100% surface functionalization) were combined with different poly(ethylene glycol) (PEG) spacer lengths (2/3.5/5 kDa), and the specific receptor binding of targeted core-shell structured poly(lactic- co-glycolic acid)/poly(lactic acid)-PEG nanoparticles was evaluated using αvβ3 integrin-overexpressing U87MG glioblastoma cells. Nanoparticles with 100% surface functionalization and short PEG2k linkers displayed a high propensity to form colloidal clusters, allowing for the cooperative binding to integrin receptors on the cellular membrane. In contrast, the high flexibility of longer PEG chains enhanced the chance of ligand entanglement and shrouding, decreasing the number of ligand-receptor binding events. As a result, the combination of short PEG2k linkers and a high cRGD surface modification synergistically increased the uptake of nanoparticles into target cells. Even though to date, the nanoparticle size and its degree of functionalization are considered to be the major determinants for controlling the uptake efficiency of targeted colloids, these results strongly suggest that the role of the linker length should be carefully taken into consideration for the design of targeted drug delivery formulations to maximize the therapeutic efficacy and minimize adverse side effects.
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Affiliation(s)
- Kathrin Abstiens
- Department of Pharmaceutical Technology, Faculty of Chemistry and Pharmacy , University of Regensburg , 93040 Regensburg , Germany
| | - Manuel Gregoritza
- Department of Pharmaceutical Technology, Faculty of Chemistry and Pharmacy , University of Regensburg , 93040 Regensburg , Germany
| | - Achim M Goepferich
- Department of Pharmaceutical Technology, Faculty of Chemistry and Pharmacy , University of Regensburg , 93040 Regensburg , Germany
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