1
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Kirichuk O, Srimasorn S, Zhang X, Roberts ARE, Coche-Guerente L, Kwok JCF, Bureau L, Débarre D, Richter RP. Competitive Specific Anchorage of Molecules onto Surfaces: Quantitative Control of Grafting Densities and Contamination by Free Anchors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:18410-18423. [PMID: 38049433 PMCID: PMC10734310 DOI: 10.1021/acs.langmuir.3c02567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/30/2023] [Accepted: 11/20/2023] [Indexed: 12/06/2023]
Abstract
The formation of surfaces decorated with biomacromolecules such as proteins, glycans, or nucleic acids with well-controlled orientations and densities is of critical importance for the design of in vitro models, e.g., synthetic cell membranes and interaction assays. To this effect, ligand molecules are often functionalized with an anchor that specifically binds to a surface with a high density of binding sites, providing control over the presentation of the molecules. Here, we present a method to robustly and quantitatively control the surface density of one or several types of anchor-bearing molecules by tuning the relative concentrations of target molecules and free anchors in the incubation solution. We provide a theoretical background that relates incubation concentrations to the final surface density of the molecules of interest and present effective guidelines toward optimizing incubation conditions for the quantitative control of surface densities. Focusing on the biotin anchor, a commonly used anchor for interaction studies, as a salient example, we experimentally demonstrate surface density control over a wide range of densities and target molecule sizes. Conversely, we show how the method can be adapted to quality control the purity of end-grafted biopolymers such as biotinylated glycosaminoglycans by quantifying the amount of residual free biotin reactant in the sample solution.
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Affiliation(s)
- Oksana Kirichuk
- School
of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, U.K.
- School
of Physics and Astronomy, Faculty of Engineering and Physical Sciences,
Astbury Centre for Structural Molecular Biology, and Bragg Centre
for Materials Research, University of Leeds, Leeds LS2 9JT, U.K.
- Université
Grenoble-Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | - Sumitra Srimasorn
- School
of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, U.K.
- School
of Physics and Astronomy, Faculty of Engineering and Physical Sciences,
Astbury Centre for Structural Molecular Biology, and Bragg Centre
for Materials Research, University of Leeds, Leeds LS2 9JT, U.K.
| | - Xiaoli Zhang
- School
of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, U.K.
- School
of Physics and Astronomy, Faculty of Engineering and Physical Sciences,
Astbury Centre for Structural Molecular Biology, and Bragg Centre
for Materials Research, University of Leeds, Leeds LS2 9JT, U.K.
| | - Abigail R. E. Roberts
- School
of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, U.K.
- School
of Physics and Astronomy, Faculty of Engineering and Physical Sciences,
Astbury Centre for Structural Molecular Biology, and Bragg Centre
for Materials Research, University of Leeds, Leeds LS2 9JT, U.K.
| | - Liliane Coche-Guerente
- Département
de Chimie Moléculaire, Université
Grenoble-Alpes, CNRS, 38000 Grenoble, France
| | - Jessica C. F. Kwok
- School
of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, U.K.
- Institute
of Experimental Medicine, Czech Academy of Sciences, Vídeňská 1083, 142 00 Prague, Czech Republic
| | - Lionel Bureau
- Université
Grenoble-Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | | | - Ralf P. Richter
- School
of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, U.K.
- School
of Physics and Astronomy, Faculty of Engineering and Physical Sciences,
Astbury Centre for Structural Molecular Biology, and Bragg Centre
for Materials Research, University of Leeds, Leeds LS2 9JT, U.K.
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2
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Wetzel R, Hauser S, Lin W, Berg P, Werner C, Pietzsch J, Kempermann G, Zhang Y. Screening Arrays of Laminin Peptides on Modified Cellulose for Promotion of Adhesion of Primary Endothelial and Neural Precursor Cells. Adv Biol (Weinh) 2021. [DOI: 10.1002/adbi.201900303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Richard Wetzel
- B CUBE Center for Molecular Bioengineering Technische Universität Dresden Tatzberg 41 Dresden 01307 Germany
| | - Sandra Hauser
- Department of Radiopharmaceutical and Chemical Biology Helmholtz‐Zentrum Dresden‐Rossendorf Institute of Radiopharmaceutical Cancer Research Bautzner Landstraße 400 Dresden 01328 Germany
| | - Weilin Lin
- B CUBE Center for Molecular Bioengineering Technische Universität Dresden Tatzberg 41 Dresden 01307 Germany
| | - Peggy Berg
- B CUBE Center for Molecular Bioengineering Technische Universität Dresden Tatzberg 41 Dresden 01307 Germany
| | - Carsten Werner
- Leibniz Institute of Polymer Research Dresden Institute of Biofunctional Polymer Materials/Max Bergmann Center of Biomaterials Hohe Str. 6 Dresden 01069 Germany
| | - Jens Pietzsch
- Department of Radiopharmaceutical and Chemical Biology Helmholtz‐Zentrum Dresden‐Rossendorf Institute of Radiopharmaceutical Cancer Research Bautzner Landstraße 400 Dresden 01328 Germany
- Faculty of Chemistry and Food Chemistry, School of Science Technische Universität Dresden Dresden 01062 Germany
| | - Gerd Kempermann
- German Center for Neurodegenerative Diseases (DZNE) Tatzberg 41 Dresden 01307 Germany
- CRTD—Center for Regenerative Therapies Dresden Technische Universität Dresden Fetscherstraße 105 Dresden 01307 Germany
| | - Yixin Zhang
- B CUBE Center for Molecular Bioengineering Technische Universität Dresden Tatzberg 41 Dresden 01307 Germany
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3
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Cantini M, Donnelly H, Dalby MJ, Salmeron‐Sanchez M. The Plot Thickens: The Emerging Role of Matrix Viscosity in Cell Mechanotransduction. Adv Healthc Mater 2020; 9:e1901259. [PMID: 31815372 DOI: 10.1002/adhm.201901259] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/26/2019] [Indexed: 12/21/2022]
Abstract
Cell mechanotransduction is an area of intense research focus. Until now, very limited tools have existed to study how cells respond to changes in the extracellular matrix beyond, for example, mechanical deformation studies and twisting cytometry. However, emerging are a range of elastic, viscoelastic and even purely viscous materials that deform and dissipate on cellular length and timescales. This article reviews developments in these materials, typically translating from 2D model surfaces to 3D microenvironments and explores how cells interact with them. Specifically, it focuses on emerging concepts such as the molecular clutch model, how different extracellular matrix proteins engage the clutch under viscoelastic-stress relaxation conditions, and how mechanotransduction can drive transcriptional control through regulators such as YAP/TAZ.
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Affiliation(s)
- Marco Cantini
- Centre for the Cellular MicroenvironmentUniversity of Glasgow Glasgow G12 8QQ UK
| | - Hannah Donnelly
- Centre for the Cellular MicroenvironmentUniversity of Glasgow Glasgow G12 8QQ UK
| | - Matthew J. Dalby
- Centre for the Cellular MicroenvironmentUniversity of Glasgow Glasgow G12 8QQ UK
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4
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Di Iorio D, Huskens J. Surface Modification with Control over Ligand Density for the Study of Multivalent Biological Systems. ChemistryOpen 2020; 9:53-66. [PMID: 31921546 PMCID: PMC6948118 DOI: 10.1002/open.201900290] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/11/2019] [Indexed: 12/30/2022] Open
Abstract
In the study of multivalent interactions at interfaces, as occur for example at cell membranes, the density of the ligands or receptors displayed at the interface plays a pivotal role, affecting both the overall binding affinities and the valencies involved in the interactions. In order to control the ligand density at the interface, several approaches have been developed, and they concern the functionalization of a wide range of materials. Here, different methods employed in the modification of surfaces with controlled densities of ligands are being reviewed. Examples of such methods encompass the formation of self-assembled monolayers (SAMs), supported lipid bilayers (SLBs) and polymeric layers on surfaces. Particular emphasis is given to the methods employed in the study of different types of multivalent biological interactions occurring at the functionalized surfaces and their working principles.
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Affiliation(s)
- Daniele Di Iorio
- Molecular NanoFabrication group MESA+ Institute for NanotechnologyUniversity of TwenteEnschedeThe Netherlands
| | - Jurriaan Huskens
- Molecular NanoFabrication group MESA+ Institute for NanotechnologyUniversity of TwenteEnschedeThe Netherlands
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5
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Farell M, Wetherington M, Shankla M, Chae I, Subramanian S, Kim SH, Aksimentiev A, Robinson J, Kumar M. Characterization of the Lipid Structure and Fluidity of Lipid Membranes on Epitaxial Graphene and Their Correlation to Graphene Features. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4726-4735. [PMID: 30844287 PMCID: PMC6449857 DOI: 10.1021/acs.langmuir.9b00164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Graphene has been recognized as an enhanced platform for biosensors because of its high electron mobility. To integrate active membrane proteins into graphene-based materials for such applications, graphene's surface must be functionalized with lipids to mimic the biological environment of these proteins. Several studies have examined supported lipids on various types of graphene and obtained conflicting results for the lipid structure. Here, we present a correlative characterization technique based on fluorescence measurements in a Raman spectroscopy setup to study the lipid structure and dynamics on epitaxial graphene. Compared to other graphene variations, epitaxial graphene is grown on a substrate more conducive to production of electronics and offers unique topographic features. On the basis of experimental and computational results, we propose that a lipid sesquilayer (1.5 bilayer) forms on epitaxial graphene and demonstrate that the distinct surface features of epitaxial graphene affect the structure and diffusion of supported lipids.
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Affiliation(s)
| | | | - Manish Shankla
- Department of Physics , University of Illinois at Urbana Champaign , Urbana , Illinois 61801 , United States
| | | | | | | | - Aleksei Aksimentiev
- Department of Physics , University of Illinois at Urbana Champaign , Urbana , Illinois 61801 , United States
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6
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Nielsen SB, Otzen DE. Quartz Crystal Microbalances as Tools for Probing Protein-Membrane Interactions. Methods Mol Biol 2019; 2003:31-52. [PMID: 31218612 DOI: 10.1007/978-1-4939-9512-7_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Extensive studies on the spontaneous collapse of phospholipid vesicles into supported lipid bilayers (SLBs) have led to procedures which allow SLB formation on a wealth of substrates and lipid compositions. SLBs provide a widely accepted and versatile model system which mimics the natural cell membrane separating the extracellular and intracellular fluids of the living cell. The quartz crystal microbalance with dissipation monitoring (QCM-D) has been central in both the understanding of vesicle collapse into SLBs on various substrates but also in probing the kinetics and mechanisms of biomolecular interactions with SLBs in real time. We describe a robust procedure to form SLBs of zwitterionic and charged lipids on SiO2 sensor crystals which subsequently can be exploited to probe the interaction between proteins and peptides with the SLB.
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Affiliation(s)
- Søren B Nielsen
- Arla Foods Ingredients Group P/S, Technology and Functionality, R&D, Protein Chemistry & Functionality, Videbæk, Denmark.
- Department of Molecular Biology and Genetics, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, Denmark.
| | - Daniel E Otzen
- Department of Molecular Biology and Genetics, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, Denmark.
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7
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Peptide-functionalized supported lipid bilayers to construct cell membrane mimicking interfaces. Colloids Surf B Biointerfaces 2018; 176:18-26. [PMID: 30590345 DOI: 10.1016/j.colsurfb.2018.12.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/22/2018] [Accepted: 12/18/2018] [Indexed: 11/22/2022]
Abstract
Supported lipid bilayers (SLB) functionalized with bioactive molecules can be effectively used to study the interaction of cells with different molecules for fundamental research or to develop biosynthetic systems for various biomedical applications. In this study, RGD and Osteocalcin mimetic (OSN) peptides were used as model molecules for functionalization of otherwise passive SLBs to evaluate cell-surface interactions via real-time monitoring in quartz crystal microbalance with dissipation. Similar platforms were also used in cell culture environment. It was seen that low density of mobile RGD peptides on SLB platforms preserved their biological activity and promoted cell adhesion more efficiently than high number of immobile, physisorbed peptides. Even though nonspecific protein and cell attachment was promoted, cells did not spread well on OSN-coated control surfaces. The stability of SLBs produced with different lipids were evaluated in various medium conditions. Enrichment with different lipids increased the stability of SLB to pure PC bilayer.
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8
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Farrukh A, Zhao S, Paez JI, Kavyanifar A, Salierno M, Cavalié A, Del Campo A. In Situ, Light-Guided Axon Growth on Biomaterials via Photoactivatable Laminin Peptidomimetic IK(HANBP)VAV. ACS APPLIED MATERIALS & INTERFACES 2018; 10:41129-41137. [PMID: 30387978 DOI: 10.1021/acsami.8b15517] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The ability to guide the growth of neurites is relevant for reconstructing neural networks and for nerve tissue regeneration. Here, a biofunctional hydrogel that allows light-based directional control of axon growth in situ is presented. The gel is covalently modified with a photoactivatable derivative of the short laminin peptidomimetic IKVAV. This adhesive peptide contains the photoremovable group 2-(4'-amino-4-nitro-[1,1'-biphenyl]-3-yl)propan-1-ol (HANBP) on the Lys rest that inhibits its activity. The modified peptide is highly soluble in water and can be simply conjugated to -COOH containing hydrogels via its terminal -NH2 group. Light exposure allows presentation of the IKVAV adhesive motif on a soft hydrogel at desired concentration and at defined position and time point. The photoactivated gel supports neurite outgrowth in embryonic neural progenitor cells culture and allows site-selective guidance of neurites extension. In situ exposure of cell cultures using a scanning laser allows outgrowth of neurites in desired pathways.
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Affiliation(s)
- Aleeza Farrukh
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
- Max Planck Graduate Center , Forum Universitatis 2 , Building 1111, 55122 Mainz , Germany
| | - Shifang Zhao
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
- Chemistry Department , Saarland University , 66123 Saarbrücken , Germany
| | - Julieta I Paez
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
| | - Atria Kavyanifar
- Institute of Physiological Chemistry , University Medical Center Johannes Gutenberg University , Hanns-Dieter-Hüsch-Weg 19 , D-55128 Mainz , Germany
| | - Marcelo Salierno
- Institute of Physiological Chemistry , University Medical Center Johannes Gutenberg University , Hanns-Dieter-Hüsch-Weg 19 , D-55128 Mainz , Germany
| | - Adolfo Cavalié
- Experimental and Clinical Pharmacology and Toxicology , Saarland University , 66421 Homburg , Germany
| | - Aránzazu Del Campo
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
- Chemistry Department , Saarland University , 66123 Saarbrücken , Germany
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9
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Farrukh A, Fan W, Zhao S, Salierno M, Paez JI, Del Campo A. Photoactivatable Adhesive Ligands for Light-Guided Neuronal Growth. Chembiochem 2018; 19:1271-1279. [PMID: 29633466 DOI: 10.1002/cbic.201800118] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Indexed: 12/21/2022]
Abstract
Neuro-regeneration after trauma requires growth and reconnection of neurons to reestablish information flow in particular directions across the damaged tissue. To support this process, biomaterials for nerve tissue regeneration need to provide spatial information to adhesion receptors on the cell membrane and to provide directionality to growing neurites. Here, photoactivatable adhesive peptides based on the CASIKVAVSADR laminin peptidomimetic are presented and applied to spatiotemporal control of neuronal growth to biomaterials in vitro. The introduction of a photoremovable group [6-nitroveratryl (NVOC), 3-(4,5-dimethoxy-2-nitrophenyl)butan-2-yl (DMNPB), or 2,2'-((3'-(1-hydroxypropan-2-yl)-4'-nitro-[1,1'-biphenyl]-4-yl)azanediyl)bis(ethan-1-ol) (HANBP)] at the amino terminal group of the K residue temporally inhibited the activity of the peptide. The bioactivity was regained through controlled light exposure. When used in neuronal culture substrates, the peptides allowed light-based control of the attachment and differentiation of neuronal cells. Site-selective irradiation activated adhesion and differentiation cues and guided seeded neurons to grow in predefined patterns. This is the first demonstration of ligand-based light-controlled interaction between neuronal cells and biomaterials.
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Affiliation(s)
- Aleeza Farrukh
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.,Max Planck Graduate Center, Forum Universitatis 2, Building 1111, 55122, Mainz, Germany
| | - Wenqiang Fan
- Institute of Physiological Chemistry, University Medical Center Johannes Gutenberg, Hanns-Dieter-Hüsch-Weg 19, 55128, Mainz, Germany
| | - Shifang Zhao
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.,Saarland University, Chemistry Department, 66123, Saarbrücken, Germany
| | - Marcelo Salierno
- Institute of Physiological Chemistry, University Medical Center Johannes Gutenberg, Hanns-Dieter-Hüsch-Weg 19, 55128, Mainz, Germany.,INIBIOMA, CRUB, Universidad Nacional del Comahue, Quintral 1250, 8400, S.C. Bariloche, Argentina
| | - Julieta I Paez
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany
| | - Aránzazu Del Campo
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.,Saarland University, Chemistry Department, 66123, Saarbrücken, Germany
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10
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Yorulmaz Avsar S, Jackman JA, Kim MC, Yoon BK, Hunziker W, Cho NJ. Immobilization Strategies for Functional Complement Convertase Assembly at Lipid Membrane Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7332-7342. [PMID: 28683197 DOI: 10.1021/acs.langmuir.7b01465] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The self-assembly formation of complement convertases-essential biomacromolecular complexes that amplify innate immune responses-is triggered by protein adsorption. Herein, a supported lipid bilayer platform was utilized to investigate the effects of covalent and noncovalent tethering strategies on the self-assembly of alternative pathway C3 convertase components, starting with C3b protein adsorption followed bythe addition of factors B and D. Quartz crystal microbalance-dissipation (QCM-D) experiments measured the real-time kinetics of convertase assembly onto supported lipid bilayers. The results demonstrate that the nature of C3b immobilization onto supported lipid bilayers is a key factor governing convertase assembly. The covalent attachment of C3b to maleimide-functionalized supported lipid bilayers promoted the self-assembly of functional C3 convertase in the membrane-associated state and further enabled successful evaluation of a clinically relevant complement inhibitor, compstatin. By contrast, noncovalent attachment of C3b to negatively charged supported lipid bilayers also permitted C3b protein uptake, albeit membrane-associated C3b did not support convertase assembly in this case. Taken together, the findings in this work demonstrate that the attachment scheme for immobilizing C3b protein at lipid membrane interfaces is critical for downstream C3 convertase assembly, thereby offering guidance for the design and evaluation of membrane-associated biomacromolecular complexes.
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Affiliation(s)
- Saziye Yorulmaz Avsar
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798 Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore
- Institute of Molecular and Cell Biology, Agency for Science Technology and Research , Singapore 138673, Singapore
| | - Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798 Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore
| | - Min Chul Kim
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798 Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore
| | - Bo Kyeong Yoon
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798 Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore
| | - Walter Hunziker
- Institute of Molecular and Cell Biology, Agency for Science Technology and Research , Singapore 138673, Singapore
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore , Singapore 117599, Singapore
- Singapore Eye Research Institute , Singapore 169856, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798 Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University , 62 Nanyang Drive, Singapore 637459, Singapore
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11
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Vafaei S, Tabaei SR, Cho NJ. Optimizing the Performance of Supported Lipid Bilayers as Cell Culture Platforms Based on Extracellular Matrix Functionalization. ACS OMEGA 2017; 2:2395-2404. [PMID: 30023663 PMCID: PMC6044817 DOI: 10.1021/acsomega.7b00158] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 03/22/2017] [Indexed: 06/01/2023]
Abstract
Strategies to fabricate biofunctionalized surfaces are essential for many biotechnological applications. Zwitterionic lipid bilayer coatings doped with lipids with chemically selective headgroups provide a robust platform for immobilization of biomolecules in an antifouling, protein resistant background. Herein, we assess the biological activity of two important components of the extracellular matrix (ECM), collagen type I (Col I) and fibronectin (FN), which are covalently attached to a supported lipid bilayer (SLB), and compare their activity with the same proteins, nonspecifically adsorbed onto a SiO2 surface. The characterization of protein coatings by quartz crystal microbalance with dissipation revealed that Col I and FN attached to SLB are less dense and have higher structural flexibility than when adsorbed onto SiO2. Cell adhesion, proliferation, and function, as well as Col I-FN interactions, were more efficient on the ECM-functionalized SLB, making it a promising platform for cell-based diagnostics, tissue engineering, medical implants, and biosensor development.
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Affiliation(s)
- Setareh Vafaei
- School
of Materials Science and Engineering, Nanyang
Technological University, 50 Nanyang Avenue, 639798 Singapore
- Centre
for Biomimetic Sensor Science, Nanyang Technological
University, 50 Nanyang Drive, 637553 Singapore
| | - Seyed R. Tabaei
- School
of Materials Science and Engineering, Nanyang
Technological University, 50 Nanyang Avenue, 639798 Singapore
- Centre
for Biomimetic Sensor Science, Nanyang Technological
University, 50 Nanyang Drive, 637553 Singapore
| | - Nam-Joon Cho
- School
of Materials Science and Engineering, Nanyang
Technological University, 50 Nanyang Avenue, 639798 Singapore
- Centre
for Biomimetic Sensor Science, Nanyang Technological
University, 50 Nanyang Drive, 637553 Singapore
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459 Singapore
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12
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Koss K, Unsworth L. Neural tissue engineering: Bioresponsive nanoscaffolds using engineered self-assembling peptides. Acta Biomater 2016; 44:2-15. [PMID: 27544809 DOI: 10.1016/j.actbio.2016.08.026] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 07/26/2016] [Accepted: 08/16/2016] [Indexed: 12/25/2022]
Abstract
UNLABELLED Rescuing or repairing neural tissues is of utmost importance to the patient's quality of life after an injury. To remedy this, many novel biomaterials are being developed that are, ideally, non-invasive and directly facilitate neural wound healing. As such, this review surveys the recent approaches and applications of self-assembling peptides and peptide amphiphiles, for building multi-faceted nanoscaffolds for direct application to neural injury. Specifically, methods enabling cellular interactions with the nanoscaffold and controlling the release of bioactive molecules from the nanoscaffold for the express purpose of directing endogenous cells in damaged or diseased neural tissues is presented. An extensive overview of recently derived self-assembling peptide-based materials and their use as neural nanoscaffolds is presented. In addition, an overview of potential bioactive peptides and ligands that could be used to direct behaviour of endogenous cells are categorized with their biological effects. Finally, a number of neurotrophic and anti-inflammatory drugs are described and discussed. Smaller therapeutic molecules are emphasized, as they are thought to be able to have less potential effect on the overall peptide self-assembly mechanism. Options for potential nanoscaffolds and drug delivery systems are suggested. STATEMENT OF SIGNIFICANCE Self-assembling nanoscaffolds have many inherent properties making them amenable to tissue engineering applications: ease of synthesis, ease of customization with bioactive moieties, and amenable for in situ nanoscaffold formation. The combination of the existing knowledge on bioactive motifs for neural engineering and the self-assembling propensity of peptides is discussed in specific reference to neural tissue engineering.
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13
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Fried ES, Luchan J, Gilchrist ML. Biodegradable, Tethered Lipid Bilayer-Microsphere Systems with Membrane-Integrated α-Helical Peptide Anchors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3470-5. [PMID: 26972467 PMCID: PMC4911039 DOI: 10.1021/acs.langmuir.6b00008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Supported lipid bilayers (SLBs) are ideally suited for the study of biomembrane-biomembrane interactions and for the biomimicry of cell-to-cell communication, allowing for surface ligand displays that contain laterally mobile elements. However, the SLB paradigm does not include three-dimensionality and biocompatibility. As a way to bypass these limitations, we have developed a biodegradable form of microsphere SLBs, also known as proteolipobeads (PLBs), using PLGA microspheres. Microspheres were synthesized using solvent evaporation and size selected with fluorescence activated cell sorting (FACS). Biomembranes were covalently tethered upon fusion to microsphere supports via short-chain PEG spacers connecting membrane-integrated α-helical peptides and the microsphere surface, affecting membrane diffusivity and mobility as indicated by confocal FRAP analysis. Membrane heterogeneities, which are attributed to PLGA hydrophobicity and rough surface topography, are curtailed by the addition of PEG tethers. This method allows for the presentation of tethered, laterally mobile biomembranes in three dimensions with functionally embedded attachment peptides for mobile ligand displays.
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Affiliation(s)
- Eric S. Fried
- Department of Chemical Engineering, The City College of the City University of New York, 140th Street and Convent Avenue, New York, New York 10031, United States
| | - Joshua Luchan
- Department of Biomedical Engineering, The City College of the City University of New York, 140th Street and Convent Avenue, New York, New York 10031, United States
| | - M. Lane Gilchrist
- Department of Chemical Engineering, The City College of the City University of New York, 140th Street and Convent Avenue, New York, New York 10031, United States
- Department of Biomedical Engineering, The City College of the City University of New York, 140th Street and Convent Avenue, New York, New York 10031, United States
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van Weerd J, Karperien M, Jonkheijm P. Supported Lipid Bilayers for the Generation of Dynamic Cell-Material Interfaces. Adv Healthc Mater 2015; 4:2743-79. [PMID: 26573989 DOI: 10.1002/adhm.201500398] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 08/03/2015] [Indexed: 12/13/2022]
Abstract
Supported lipid bilayers (SLB) offer unique possibilities for studying cellular membranes and have been used as a synthetic architecture to interact with cells. Here, the state-of-the-art in SLB-based technology is presented. The fabrication, analysis, characteristics and modification of SLBs are described in great detail. Numerous strategies to form SLBs on different substrates, and the means to patteren them, are described. The use of SLBs as model membranes for the study of membrane organization and membrane processes in vitro is highlighted. In addition, the use of SLBs as a substratum for cell analysis is presented, with discrimination between cell-cell and cell-extracellular matrix (ECM) mimicry. The study is concluded with a discussion of the potential for in vivo applications of SLBs.
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Affiliation(s)
- Jasper van Weerd
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
| | - Marcel Karperien
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
| | - Pascal Jonkheijm
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
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15
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Feng S, Lu L, Zan X, Wu Y, Lin Y, Wang Q. Genetically Engineered Plant Viral Nanoparticles Direct Neural Cells Differentiation and Orientation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9402-9409. [PMID: 26247572 DOI: 10.1021/acs.langmuir.5b02226] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An important aim of tissue engineering is to design biomimetic materials with specific cell binding motifs and precisely controlled structural organization, thereby providing biochemical and physical cues for desired cellular behaviors. Previously, our group generated genetically modified tobacco mosaic virus (TMV) displaying integrin binding motifs, RGD1, RGD7, PSHRN3, P15, and DGEA. The resulting rod-like virus particles displaying integrin binding motifs were biocompatible with Neuro 2A (N2a), a mouse neural crest-derived cell line, and could promote the neurite outgrowth of N2a. The genetically modified viruses could be assembled with aligned orientation in the capillary by applying a shear force. The resulting aligned substrates were able to dictate directional neurite outgrowth of N2a cells. Therefore, this method could be potentially applied for neural tissue engineering, as a neural conduit for repairing peripheral nerve injuries.
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Affiliation(s)
- Sheng Feng
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Lin Lu
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Xingjie Zan
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Yehong Wu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China
| | - Yuan Lin
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China
| | - Qian Wang
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China
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16
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Yang YH, Khan Z, Ma C, Lim HJ, Smith Callahan LA. Optimization of adhesive conditions for neural differentiation of murine embryonic stem cells using hydrogels functionalized with continuous Ile-Lys-Val-Ala-Val concentration gradients. Acta Biomater 2015; 21:55-62. [PMID: 25931018 DOI: 10.1016/j.actbio.2015.04.031] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 03/31/2015] [Accepted: 04/21/2015] [Indexed: 01/12/2023]
Abstract
Stem cell therapies, which aim to restore neurological function after central nervous system injury, have shown increased efficacy when a tissue engineering matrix is implanted with cells compared to implantation of the cells alone. However, much work still needs to be done to characterize materials that can be used to facilitate and direct the differentiation of implanted cells. In the current study, polyethylene glycol hydrogels functionalized with continuous Ile-Lys-Val-Ala-Val (IKVAV) concentration gradients were fabricated and utilized to systematically study and optimize the adhesive conditions for neural differentiation of mouse embryonic stem cells in two- and three-dimensional environments. The results suggest that 570 μM and 60 μM are the optimal IKVAV concentrations for 2D and 3D neural differentiation, respectively, to maximize mRNA expression of neuron-specific markers and neurite extension while minimizing apoptotic activities in cultured cells compared to those exposed to higher IKVAV concentrations. The combinatorial approach presented in this work demonstrates that hydrogels functionalized with bioactive peptides provide a defined and tunable platform that can be employed to characterize and improve culture conditions for superior survival, maturation and integration of implanted cells, leading to enhanced restoration of neurological function for those receiving stem cell therapies after traumatic brain and spinal cord injuries.
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17
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Rodda AE, Meagher L, Nisbet DR, Forsythe JS. Specific control of cell–material interactions: Targeting cell receptors using ligand-functionalized polymer substrates. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2013.11.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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18
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Brinkmann J, Cavatorta E, Sankaran S, Schmidt B, van Weerd J, Jonkheijm P. About supramolecular systems for dynamically probing cells. Chem Soc Rev 2014; 43:4449-69. [PMID: 24681633 DOI: 10.1039/c4cs00034j] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This article reviews the state of the art in the development of strategies for generating supramolecular systems for dynamic cell studies. Dynamic systems are crucial to further our understanding of cell biology and are consequently at the heart of many medical applications. Increasing interest has therefore been focused recently on rendering systems bioactive and dynamic that can subsequently be employed to engage with cells. Different approaches using supramolecular chemistry are reviewed with particular emphasis on their application in cell studies. We conclude with an outlook on future challenges for dynamic cell research and applications.
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Affiliation(s)
- Jenny Brinkmann
- MESA+ Institute for Nanotechnology and Department of Science and Technology, Laboratory Group of Bioinspired Molecular Engineering, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
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19
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Jing Y, Trefna H, Persson M, Kasemo B, Svedhem S. Formation of supported lipid bilayers on silica: relation to lipid phase transition temperature and liposome size. SOFT MATTER 2014; 10:187-195. [PMID: 24651504 DOI: 10.1039/c3sm50947h] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
DPPC liposomes ranging from 90 nm to 160 nm in diameter were prepared and used for studies of the formation of supported lipid membranes on silica (SiO2) at temperatures below and above the gel to liquid-crystalline phase transition temperature (Tm = 41 °C), and by applying temperature gradients through Tm. The main method was the quartz crystal microbalance with dissipation (QCM-D) technique. It was found that liposomes smaller than 100 nm spontaneously rupture on the silica surface when deposited at a temperature above Tm and at a critical surface coverage, following a well-established pathway. In contrast, DPPC liposomes larger than 160 nm do not rupture on the surface when adsorbed at 22 °C or at 50 °C. However, when liposomes of this size are first adsorbed at 22 °C and at a high enough surface coverage, after which they are subject to a constant temperature gradient up to 50 °C, they rupture and fuse to a bilayer, a process that is initiated around Tm. The results are discussed and interpreted considering a combination of effects derived from liposome-surface and liposome-liposome interactions, different softness/stiffness and shape of liposomes below and above Tm, the dynamics and thermal activation of the bilayers occurring around Tm and (for liposomes containing 33% of NaCl) osmotic pressure. These findings are valuable both for preparation of supported lipid bilayer cell membrane mimics and for designing temperature-responsive material coatings.
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Affiliation(s)
- Yujia Jing
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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20
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Andreasson-Ochsner M, Reimhult E. Mobile and three-dimensional presentation of adhesion proteins within microwells. Methods Mol Biol 2013; 1046:123-32. [PMID: 23868585 DOI: 10.1007/978-1-62703-538-5_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
On traditional cell culture substrates cells adhere to a planar 2D surface where ligands are presented immobile. A more realistic presentation of cell adhesion ligands which can account for lateral mobility and a more tissue-like 3D presentation would allow studies addressing fundamental questions of significant importance for applications such as tissue engineering and implant intregration. To study the effect of lateral mobility of cell membrane interaction cues in three dimensions, we have developed and characterized a platform which generically enables patterning of single cells into microwells presenting a cell membrane mimetic interface pre-patterned to its walls. Here, we describe its application in presenting a soluble cell adhesive ligand coupled through streptavidin-antibody linkage to lipids in a supported lipid bilayer (SLB) coated microwell. The lateral mobility of the presented ligands was controlled through a small change in temperature. The SLB phospholipid composition was choosen such that below its melting transition at 30 °C the ligands are immobile, while above 30 °C they are laterally mobile. The platform thus enables the investigation of cell adhesion to either laterally immobile or mobile E-cadherin ligand presented on the same cell membrane mimetic surface.
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Affiliation(s)
- Mirjam Andreasson-Ochsner
- Department of Materials, Laboratory for Surface Science and Technology, ETH Zurich, Zurich, Switzerland
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21
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Solid-supported lipid bilayers to drive stem cell fate and tissue architecture using periosteum derived progenitor cells. Biomaterials 2013; 34:1878-87. [DOI: 10.1016/j.biomaterials.2012.09.024] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 09/13/2012] [Indexed: 12/25/2022]
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22
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Torres AJ, Contento RL, Gordo S, Wucherpfennig KW, Love JC. Functional single-cell analysis of T-cell activation by supported lipid bilayer-tethered ligands on arrays of nanowells. LAB ON A CHIP 2013; 13:90-9. [PMID: 23070211 PMCID: PMC3522575 DOI: 10.1039/c2lc40869d] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Supported lipid bilayers are an important biomolecular tool for characterizing immunological synapses. Immobilized bilayers presenting tethered ligands on planar substrates have yielded both spatio-temporal and structural insights into how T cell receptors (TCRs) reorganize during the initial formation of synapses upon recognition of peptide antigens bound to major histocompatibility complex (MHC) molecules. The prototypical configuration of these assays, however, limits the extent to which the kinetics and structure of the supramolecular activation clusters of the synapse (that occur in seconds or minutes) can be related to subsequent complex cellular responses, such as cytokine secretion and proliferation, occurring over hours to days. Here we describe a new method that allows correlative measures of both attributes with single-cell resolution by using immobilized lipid bilayers and tethered ligands on the surface of dense arrays of subnanoliter wells. This modification allows each nanowell to function as an artificial antigen-presenting cell (APC), and the synapses formed upon contact can be imaged by fluorescence microscopy. We show that the lipid bilayers remain stable and mobile on the surface of the PDMS, and that modifying the ligands tethered to the bilayer alters the structure of the resulting synapses in expected ways. Finally, we demonstrate that this approach allows the subsequent characterization of secreted cytokines from the activated human T cell clones by microengraving in both antigen- and pan-specific manners. This new technique should allow detailed investigations on how biophysical and structural aspects of the synapse influence the activation of individual T cells and their complex functional responses.
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Affiliation(s)
- Alexis J. Torres
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Rita Lucia Contento
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Susana Gordo
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115
| | - Kai W. Wucherpfennig
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115
- Program in Immunology, Harvard Medical School, Boston, MA 02115
| | - J. Christopher Love
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139
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23
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Nielsen SB, Otzen DE. Quartz crystal microbalances as tools for probing protein-membrane interactions. Methods Mol Biol 2013; 974:1-21. [PMID: 23404269 DOI: 10.1007/978-1-62703-275-9_1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Extensive studies on the spontaneous collapse of phospholipid vesicles into supported lipid bilayers (SLBs) have led to procedures which allow SLB formation on a wealth of substrates and lipid compositions. SLBs provide a widely accepted and versatile model system which mimics the natural cell membrane separating the extracellular and intracellular fluids of the living cell. The quartz crystal microbalance with dissipation monitoring (QCM-D) has been central both in the understanding of vesicle collapse into SLBs on various substrates and in probing the kinetics and mechanisms of biomolecular interactions with SLBs in real time. We describe a robust procedure to form SLBs of zwitterionic and charged lipids on SiO(2) sensor crystals which subsequently can be exploited to probe the interaction between proteins and peptides with the SLB.
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Affiliation(s)
- Søren B Nielsen
- Department of Molecular Biology and Genetics, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhusc, Denmark
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24
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Nickels JD, Schmidt CE. Surface modification of the conducting polymer, polypyrrole, via affinity peptide. J Biomed Mater Res A 2012; 101:1464-71. [PMID: 23129217 DOI: 10.1002/jbm.a.34435] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 08/12/2012] [Accepted: 08/28/2012] [Indexed: 11/08/2022]
Abstract
A novel strategy for affinity-based surface modification of the conducting polymer, polypyrrole, (PPy), has been developed. A 12-amino acid peptide (THRTSTLDYFVI, hereafter denoted T59) was previously identified via the phage display technique. This peptide noncovalently binds to the chlorine-doped conducting polymer polypyrrole (PPyCl). Studies have previously shown that conductive polymers have promising application in neural electrodes, sensors, and for improving regeneration and healing of peripheral nerves and other tissues. Thus, the strong and specific attachment of bioactive molecules to the surface of PPy using the T59 affinity peptide is an exciting new approach to enhance the bioactivity of electrically active materials for various biomedical applications. We demonstrate this by using T59 as a tether to modify PPyCl with the laminin fragment IKVAV to enhance cell interactions, as well as with the so-called stealth molecule poly(ethylene glycol; PEG) to decrease cell interactions. Using these two modification strategies, we were able to control cell attachment and neurite extension on the PPy surface, which is critical for different applications (i.e., the goal for tissue regeneration is to enhance cell interactions, whereas the goal for electrode and sensor applications is to reduce glial cell interactions and thus decrease scarring). Significantly, the conductivity of the PPyCl surface was unaffected by this surface modification technique, which is not the case with other methods that have been explored to surface modify conducting polymers. Finally, using subcutaneous implants, we confirmed that the PPyCl treated with the T59 peptide did not react in vivo differently than untreated PPyCl.
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Affiliation(s)
- Jonathan D Nickels
- Department of Biomedical Engineering, the University of Texas at Austin, Austin, Texas 78712, USA
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25
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Afanasenkau D, Offenhäusser A. Positively charged supported lipid bilayers as a biomimetic platform for neuronal cell culture. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13387-13394. [PMID: 22920161 DOI: 10.1021/la302500r] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The supported lipid bilayer (SLB) is a well-known system for studying the cell membrane and membrane proteins. It is also promising as a platform for studying cell processes: the cell adhesion, the cell membrane receptors, and the intercellular signaling processes. SLBs made of natural lipids appeared to be protein and cell repellent. Thus, to use the SLB as a substrate for cells, one should functionalize them to provide adhesion. In the present paper, we describe a simple approach to promote adhesion of neuronal cells to the SLB without using proteins or peptides, by introducing positively charged lipids 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP) into the SLB made of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC). We show that neurons adhere to these bilayers and grow for at least 10 days. The SLBs themselves were found to degrade with time in cell culture conditions, but maintained fluidity (as revealed by fluorescence recovery after photobleaching), demonstrating the possibility of using SLBs for studying neuronal cells in culture.
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Affiliation(s)
- Dzmitry Afanasenkau
- Peter Grünberg Institute/Institute of Complex Systems Bioelectronics (PGI-8/ICS-8), Research Center Juelich, D-52425 Juelich, Germany
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26
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Altgärde N, Becher J, Möller S, Weber FE, Schnabelrauch M, Svedhem S. Immobilization of chondroitin sulfate to lipid membranes and its interactions with ECM proteins. J Colloid Interface Sci 2012; 390:258-66. [PMID: 23026301 DOI: 10.1016/j.jcis.2012.07.063] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 07/18/2012] [Accepted: 07/24/2012] [Indexed: 11/24/2022]
Abstract
Glycosaminoglycans (GAGs) in the extracellular matrix (ECM) have multiple functions in tissues including providing support, mediating cell division and differentiation, and taking part in important interactions with proteins, e.g. growth factors. Studying GAG related interactions is inherently difficult and requires suitable interaction platforms. We show two strategies to covalently couple the GAG chondroitin sulfate (CS) to supported lipid bilayers (SLBs), either by (a) activating carboxy-functionalized phospholipids in the lipid bilayer, followed by the addition of hydrazide-functionalized CS, or by (b) activating naturally occurring carboxyl groups on CS prior to addition to an amino-functionalized SLB. Bilayer formation and subsequent immobilization was followed in real-time using the Quartz Crystal Microbalance with Dissipation monitoring, a technique that provides unique information when studying highly hydrated molecular films. The two strategies yielded thin CS films (in the nanometer range) with similar viscoelastic properties. Fluidity of the lipid bilayer was retained when CS was coupled. The application of the CS interaction platform was exemplified for type I collagen and the bone inducing growth factor bone morphogenetic protein-2 (BMP-2). The addition of collagen to immoblized CS resulted in soft layers whereas layers formed by addition of BMP-2 were denser, independent on the immobilization strategy used.
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Affiliation(s)
- Noomi Altgärde
- Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.
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27
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Andreasson-Ochsner M, Romano G, Håkanson M, Smith ML, Leckband DE, Textor M, Reimhult E. Single cell 3-D platform to study ligand mobility in cell-cell contact. LAB ON A CHIP 2011; 11:2876-2883. [PMID: 21773619 DOI: 10.1039/c1lc20067d] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Lateral mobility and dimensionality have both been shown to influence cellular behavior, but have yet to be combined and applied in a single in vitro platform to address, e.g., cell adhesion in a setting mimicking the three-dimensional environment of neighboring cells in a reductionist way. To study the effect of the lateral mobility of cell adhesive ligands in three dimensions we present and characterize a platform, which enables patterning of single cells into microwells presenting a cell membrane mimetic interface pre-patterned to its walls. Soluble E-cadherin extracellular domains coupled through an optimized streptavidin-antibody linkage to lipids in a supported lipid bilayer (SPB) were presented on the microwell walls as either laterally mobile or immobile ligands. The fluidity was controlled through a small change in temperature by choosing phospholipids for the SPB with a lipid phase transition temperature around 30 °C. The platform thus enabled the investigation of cell adhesion to either laterally immobile or mobile E-cadherin ligands presented on the same cell membrane mimetic surface. Chinese hamster ovary (CHO) cells engineered to express E-cadherin that were cultured on the platform demonstrated that enhanced cadherin lateral mobility significantly decreased the formation of actin bundles and resulted in more diffuse actin organization, while constraining the cell shape to that of the microwell. This example highlights the potential to use in vitro cell culture platforms to mimic direct cell-cell interaction in a controlled environment that nevertheless captures the dynamic nature of the native cell environment.
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Affiliation(s)
- Mirjam Andreasson-Ochsner
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
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28
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Kim SY, Kim KM, Hoffman-Kim D, Song HK, Palmore GTR. Quantitative control of neuron adhesion at a neural interface using a conducting polymer composite with low electrical impedance. ACS APPLIED MATERIALS & INTERFACES 2011; 3:16-21. [PMID: 21142128 DOI: 10.1021/am1008369] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Tailoring cell response on an electrode surface is essential in the application of neural interfaces. In this paper, a method of controlling neuron adhesion on the surface of an electrode was demonstrated using a conducting polymer composite as an electrode coating. The electrodeposited coating was functionalized further with biomolecules-of-interest (BOI), with their surface concentration controlled via repetition of carbodiimide chemistry. The result was an electrode surface that promoted localized adhesion of primary neurons, the density of which could be controlled quantitatively via changes in the number of layers of BOI added. Important to neural interfaces, it was found that additional layers of BOI caused an insignificant increase in the electrical impedance, especially when compared to the large drop in impedance upon coating of the electrode with the conducting polymer composite.
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Affiliation(s)
- Sung Yeol Kim
- School of Engineering, Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, Rhode Island 02912, United States
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29
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Gumera C, Rauck B, Wang Y. Materials for central nervous system regeneration: bioactive cues. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm04335d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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30
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Huth M, Hertrich S, Mezo G, Madarasz E, Nickel B. Neural Stem Cell Spreading on Lipid Based Artificial Cell Surfaces, Characterized by Combined X-ray and Neutron Reflectometry. MATERIALS (BASEL, SWITZERLAND) 2010; 3:4994-5006. [PMID: 28883366 PMCID: PMC5445775 DOI: 10.3390/ma3114994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Accepted: 11/09/2010] [Indexed: 11/16/2022]
Abstract
We developed a bioadhesive coating based on a synthetic peptide-conjugate (AK-cyclo[RGDfC]) which contains multiples of the arginyl-glycyl-aspartic acid (RGD) amino acid sequence. Biotinylated AK-cyclo[RGDfC] is bound to a supported lipid bilayer via a streptavidin interlayer. Layering, hydration and packing of the coating is quantified by X-ray and neutron reflectometry experiments. AK-cyclo[RGDfC] binds to the streptavidin interlayer in a stretched-out on edge configuration. The highly packed configuration with only 12% water content maximizes the number of accessible adhesion sites. Enhanced cell spreading of neural stem cells was observed for AK-cyclo[RGDfC] functionalized bilayers. Due to the large variety of surfaces which can be coated by physisorption of lipid bilayers, this approach is of general interest for the fabrication of biocompatible surfaces.
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Affiliation(s)
- Martin Huth
- Ludwig-Maximilians-Universität, Department für Physik and CeNS, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
| | - Samira Hertrich
- Ludwig-Maximilians-Universität, Department für Physik and CeNS, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
| | - Gabor Mezo
- Research Group of Peptide Chemistry, Hungarian Academy of Science, Eötvös L. University, Pazmany P. stny. 1/A, 1117 Budapest, Hungary.
| | - Emilia Madarasz
- Laboratory of Cellular and Developmental Neurobiology, Institute of Experimental Medicine of Hungarian Academy of Science, Szigony u. 43, Budapest, H-1083, Hungary.
| | - Bert Nickel
- Ludwig-Maximilians-Universität, Department für Physik and CeNS, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
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31
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Ananthanarayanan B, Little L, Schaffer DV, Healy KE, Tirrell M. Neural stem cell adhesion and proliferation on phospholipid bilayers functionalized with RGD peptides. Biomaterials 2010; 31:8706-15. [PMID: 20728935 DOI: 10.1016/j.biomaterials.2010.07.104] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Accepted: 07/28/2010] [Indexed: 12/21/2022]
Abstract
Peptide-functionalized materials show promise in controlling stem cell behavior by mimicking cell-matrix interactions. Supported lipid bilayers are an excellent platform for displaying peptides due to their ease of fabrication and low non-specific interactions with cells. In this paper, we report on the behavior of adult hippocampal neural stem cells (NSCs) on phospholipid bilayers functionalized with different RGD-containing peptides: either GGGNGEPRGDTYRAY ('bsp-RGD(15)') or GRGDSP. Fluid supported bilayers were prepared on glass surfaces by adsorption and fusion of small lipid vesicles incorporating synthetic peptide amphiphiles. NSCs adhered to bilayers with either GRGDSP or bsp-RGD(15) peptide. After 5 days in culture, NSCs formed neurosphere-like aggregates on GRGDSP bilayers, whereas on bsp-RGD(15) bilayers a large fraction of single adhered cells were observed, comparable to monolayer growth seen on laminin controls. NSCs retained their ability to differentiate into neurons and astrocytes on both peptide surfaces. This work illustrates the utility of supported bilayers in displaying peptide ligands and demonstrates that RGD peptides may be useful in synthetic culture systems for stem cells.
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Affiliation(s)
- Badriprasad Ananthanarayanan
- Department of Chemical Engineering and Materials Research Laboratory, University of California, Santa Barbara, CA 93106, United States.
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Quartz crystal microbalance with dissipation monitoring of supported lipid bilayers on various substrates. Nat Protoc 2010; 5:1096-106. [PMID: 20539285 DOI: 10.1038/nprot.2010.65] [Citation(s) in RCA: 386] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Supported lipid bilayers (SLBs) mimic biological membranes and are a versatile platform for a wide range of biophysical research fields including lipid-protein interactions, protein-protein interactions and membrane-based biosensors. The quartz crystal microbalance with dissipation monitoring (QCM-D) has had a pivotal role in understanding SLB formation on various substrates. As shown by its real-time kinetic monitoring of SLB formation, QCM-D can probe the dynamics of biomacromolecular interactions. We present a protocol for constructing zwitterionic SLBs supported on silicon oxide and titanium oxide, and discuss technical issues that need to be considered when working with charged lipid compositions. Furthermore, we explain a recently developed strategy that uses an amphipathic, alpha-helical (AH) peptide to form SLBs on gold and titanium oxide substrates. The protocols can be completed in less than 3 h.
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Gopalakrishnan G, Thostrup P, Rouiller I, Lucido AL, Belkaïd W, Colman DR, Lennox RB. Lipid bilayer membrane-triggered presynaptic vesicle assembly. ACS Chem Neurosci 2010; 1:86-94. [PMID: 22778819 PMCID: PMC3368651 DOI: 10.1021/cn900011n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Accepted: 10/01/2009] [Indexed: 11/30/2022] Open
Abstract
The formation of functional synapses on artificial substrates is a very important step in the development of engineered in vitro neural networks. Spherical supported bilayer lipid membranes (SS-BLMs) are used here as a novel substrate to demonstrate presynaptic vesicle accumulation at an in vitro synaptic junction. Confocal fluorescence microscopy, cryo-transmission electron microscopy (cryo-TEM), and fluorescence recovery after photobleaching (FRAP) experiments have been used to characterize the SS-BLMs. Conventional immunocytochemistry combined with confocal fluorescence microscopy was used to observe the formation of presynaptic vesicles at the neuron-SS-BLM contacts. These results indicate that lipid phases may play a role in the observed phenomenon, in addition to the chemical and electrostatic interactions between the neurons and SS-BLMs. The biocompatibility of lipid bilayers along with their membrane tunability makes the suggested approach a useful "toolkit" for many neuroengineering applications including artificial synapse formation and synaptogenesis in vivo.
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Affiliation(s)
- Gopakumar Gopalakrishnan
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, H3A 2K6 Montreal, Canada
- Montreal Neurological Institute & Hospital, McGill University, 3801 University Street, H3A 2B4 Montreal, Canada
- McGill Program in Neuroengineering, McGill University, Montreal, Canada
- FQRNT Centre for Self-Assembled Chemical Structures (CSACS), McGill University, Montreal, Canada
| | - Peter Thostrup
- Department of Physics, McGill University, 3600 University Street, H3A 2T8 Montreal, Canada
- McGill Program in Neuroengineering, McGill University, Montreal, Canada
| | - Isabelle Rouiller
- Department of Anatomy & Cell Biology, McGill University, 3640 University Street, H3A 2B2 Montreal, Canada
| | - Anna Lisa Lucido
- Montreal Neurological Institute & Hospital, McGill University, 3801 University Street, H3A 2B4 Montreal, Canada
- McGill Program in Neuroengineering, McGill University, Montreal, Canada
| | - Wiam Belkaïd
- Montreal Neurological Institute & Hospital, McGill University, 3801 University Street, H3A 2B4 Montreal, Canada
- McGill Program in Neuroengineering, McGill University, Montreal, Canada
| | - David R. Colman
- Montreal Neurological Institute & Hospital, McGill University, 3801 University Street, H3A 2B4 Montreal, Canada
- McGill Program in Neuroengineering, McGill University, Montreal, Canada
| | - R. Bruce Lennox
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, H3A 2K6 Montreal, Canada
- McGill Program in Neuroengineering, McGill University, Montreal, Canada
- FQRNT Centre for Self-Assembled Chemical Structures (CSACS), McGill University, Montreal, Canada
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Briand E, Zäch M, Svedhem S, Kasemo B, Petronis S. Combined QCM-D and EIS study of supported lipid bilayer formation and interaction with pore-forming peptides. Analyst 2010; 135:343-50. [DOI: 10.1039/b918288h] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Larsson EM, Edvardsson MEM, Langhammer C, Zorić I, Kasemo B. A combined nanoplasmonic and electrodeless quartz crystal microbalance setup. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:125105. [PMID: 20059168 DOI: 10.1063/1.3265321] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have developed an instrument combining localized surface plasmon resonance (LSPR) sensing with electrodeless quartz crystal microbalance with dissipation monitoring (QCM-D). The two techniques can be run simultaneously, on the same sensor surface, and with the same time resolution and sensitivity as for the individual techniques. The electrodeless QCM eliminates the need to fabricate electrodes on the quartz crystal and gives a large flexibility in choosing the surface structure and coating for both QCM-D and LSPR. The performance is demonstrated for liquid phase measurements of lipid bilayer formation and biorecognition events, and for gas phase measurements of hydrogen uptake/release by palladium nanoparticles. Advantages of using the combined equipment for biomolecular adsorption studies include synchronized information about structural transformations and extraction of molecular (dry) mass and degree of hydration of the adlayer, which cannot be obtained with the individual techniques. In hydrogen storage studies the combined equipment, allows for synchronized measurements of uptake/release kinetics and quantification of stored hydrogen amounts in nanoparticles and films at practically interesting hydrogen pressures and temperatures.
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Affiliation(s)
- Elin M Larsson
- Department of Applied Physics, Chemical Physics Group, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
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36
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Protein adsorption and desorption on lipid bilayers. Biophys Chem 2009; 146:60-4. [PMID: 19903579 DOI: 10.1016/j.bpc.2009.10.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2009] [Revised: 10/18/2009] [Accepted: 10/20/2009] [Indexed: 11/22/2022]
Abstract
The protein surface usually exhibits one or a few charged spots. If a lipid bilayer contains a significant amount of lipids with oppositely charged head groups, protein adsorption on a bilayer may be energetically favourable due to the protein-lipid electrostatic interaction. The specifics of this case are that the lipids are highly mobile and the protein adsorption is accompanied by the redistribution of lipids between the areas covered and not covered by protein. We present a kinetic model illustrating that this effect is especially interesting if the fraction of the surface covered by charged lipids is relatively low. In this situation, with increasing protein coverage, the protein desorption rate constant rapidly increases while the adsorption rate constant drops, so that there is critical fraction of the area covered by protein. Adsorption above this fraction is hindered both kinetically and thermodynamically.
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37
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Reimhult E, Kasemo B, Höök F. Rupture pathway of phosphatidylcholine liposomes on silicon dioxide. Int J Mol Sci 2009; 10:1683-1696. [PMID: 19468333 PMCID: PMC2680641 DOI: 10.3390/ijms10041683] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/03/2009] [Accepted: 04/10/2009] [Indexed: 11/17/2022] Open
Abstract
We have investigated the pathway by which unilamellar POPC liposomes upon adsorption undergo rupture and form a supported lipid bilayer (SLB) on a SiO(2) surface. Biotinylated lipids were selectively incorporated in the outer monolayer of POPC liposomes to create liposomes with asymmetric lipid compositions in the outer and inner leaflets. The specific binding of neutravidin and anti-biotin to SLBs formed by liposome fusion, prior to and after equilibrated flip-flop between the upper and lower monolayers in the SLB, were then investigated. It was concluded that the lipids in the outer monolayer of the vesicle predominantly end up on the SLB side facing the SiO(2) substrate, as demonstrated by having maximum 30-40% of lipids in the liposome outer monolayer orienting towards the bulk after forming the SLB.
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Affiliation(s)
- Erik Reimhult
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; E-Mails:
(B.K.);
(F.H.)
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology Zurich (ETH Zurich), CH-8093 Zurich, Switzerland
| | - Bengt Kasemo
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; E-Mails:
(B.K.);
(F.H.)
| | - Fredrik Höök
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; E-Mails:
(B.K.);
(F.H.)
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38
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Merzlyak A, Indrakanti S, Lee SW. Genetically engineered nanofiber-like viruses for tissue regenerating materials. NANO LETTERS 2009; 9:846-52. [PMID: 19140698 DOI: 10.1021/nl8036728] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Controlling structural organization and signaling motif display of biomimetic matrices at the nanometer scale is of great importance to the functional design of tissue regenerating materials. We have genetically engineered M13 bacteriophage (phage), naturally occurring nanofiber-like viruses, to display a high density of cell-signaling peptides on their major coat proteins. Structural orientation of these phage building blocks can be achieved due to their long-rod shape and monodispersity, which lead them to self-assemble into directionally organized liquid crystalline-like materials. We showed that the constructed viral nanofiber scaffolds were able to support neural progenitor cell proliferation and differentiation as well as direct orientation of their growth in three dimensions. Such functionalized and structurally aligned phage matrices offer promising opportunities for therapies that address challenging medical problems, such as nerve tissue regeneration after spinal cord injuries, or as in vitro model systems for studying complicated cell signaling environments.
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Affiliation(s)
- Anna Merzlyak
- Department of Bioengineering, University of California, Berkeley, USA
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Edvardsson M, Svedhem S, Wang G, Richter R, Rodahl M, Kasemo B. QCM-D and Reflectometry Instrument: Applications to Supported Lipid Structures and Their Biomolecular Interactions. Anal Chem 2008; 81:349-61. [DOI: 10.1021/ac801523w] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Malin Edvardsson
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Sofia Svedhem
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Guoliang Wang
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Ralf Richter
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Michael Rodahl
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Bengt Kasemo
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
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Dellatore SM, Garcia AS, Miller WM. Mimicking stem cell niches to increase stem cell expansion. Curr Opin Biotechnol 2008; 19:534-40. [PMID: 18725291 DOI: 10.1016/j.copbio.2008.07.010] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Revised: 07/24/2008] [Accepted: 07/29/2008] [Indexed: 01/09/2023]
Abstract
Niches regulate lineage-specific stem cell self-renewal versus differentiation in vivo and are composed of supportive cells and extracellular matrix components arranged in a three-dimensional topography of controlled stiffness in the presence of oxygen and growth factor gradients. Mimicking stem cell niches in a defined manner will facilitate production of the large numbers of stem cells needed to realize the promise of regenerative medicine and gene therapy. Progress has been made in mimicking components of the niche. Immobilizing cell-associated Notch ligands increased the self-renewal of hematopoietic (blood) stem cells. Culture on a fibrous scaffold that mimics basement membrane texture increased the expansion of hematopoietic and embryonic stem cells. Finally, researchers have created intricate patterns of cell-binding domains and complex oxygen gradients.
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Affiliation(s)
- Shara M Dellatore
- Northwestern University, Department of Chemical and Biological Engineering, 2145 Sheridan Road, Tech E136, Evanston, IL 60208, USA
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Thid D, Bally M, Holm K, Chessari S, Tosatti S, Textor M, Gold J. Issues of ligand accessibility and mobility in initial cell attachment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:11693-11704. [PMID: 17918863 DOI: 10.1021/la701159u] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The influence of lateral ligand mobility on cell attachment and receptor clustering has previously been explored for membrane-anchored molecules involved in cell-cell adhesion. In this study, we considered instead a cell binding motif from the extracellular matrix. Even though the lateral mobility of extracellular matrix ligands in membranes does not occur in vivo, we believe it is of interest for cell engineering in vitro. As is the case for cell-cell adhesion molecules, lateral mobility of extracellular matrix ligands could influence cell attachment and, subsequently, cell behavior in cell culture. In this paper, the accessibility and functionality of extracellular matrix ligands presented at surfaces were evaluated for the conditions of laterally mobile versus non-mobile ligands by studying ligand-antibody binding events and early cell attachment as a function of ligand concentration. We compare the initial attachment of rat-derived adult hippocampal progenitor (AHP) cells on laterally mobile, supported phospholipid bilayer membranes to non-mobile, poly-L-lysine-grafted-poly(ethylene glycol) (PLL-g-PEG) polymer films functionalized with a range of laminin-derived IKVAV-containing peptide densities. To this end, synthesis of a new PLL-g-PEG/PEG-IKVAV polymer is described. The characterization of available IKVAV peptides on both surface presentations schemes was explored by studying the mass uptake of anti-IKVAV antibodies using a combination of the surface-sensitive techniques quartz crystal microbalance with dissipation monitoring, surface plasmon resonance spectroscopy, and optical waveguide lightmode spectroscopy. IKVAV-containing peptides presented on laterally mobile, supported phospholipid bilayers and non-mobile PLL-g-PEG were recognized by the anti-IKVAV antibody in a dose-dependent manner, indicating that the amount of available IKVAV ligands increases proportionally with ligand density over the concentrations tested. Attachment of AHP cells to IKVAV-functionalized PLL-g-PEG and supported phospholipid bilayers followed a sigmoidal dependence on peptide concentration, with a critical concentration of approximately 3 pmol/cm2 IKVAV ligands required to support initial AHP cell attachment for both surface modifications. There appeared to be little influence of IKVAV peptide mobility on the initial attachment of AHP cells. Although the spread in the cell attachment data was larger for the PLL-g-PEG surface modification, this was reduced when observed after 24 h, indicating that the cells might need longer times to establish attachment strengths equivalent to those observed on peptide-functionalized supported lipid bilayers. The present study is a step toward understanding the influence of extracellular-matrix-derived ligand mobility on cell fate. Further analysis should focus on the systematic tuning of lateral ligand diffusion, as well as a comparison between the response of non-spreading cells (i.e., AHPs), versus spreading cells (i.e., fibroblasts).
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Affiliation(s)
- Dorota Thid
- Department of Applied Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden
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