51
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Lee TT, García JR, Paez J, Singh A, Phelps EA, Weis S, Shafiq Z, Shekaran A, del Campo A, García AJ. Light-triggered in vivo activation of adhesive peptides regulates cell adhesion, inflammation and vascularization of biomaterials. NATURE MATERIALS 2015; 14:352-60. [PMID: 25502097 PMCID: PMC4336636 DOI: 10.1038/nmat4157] [Citation(s) in RCA: 288] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Accepted: 10/31/2014] [Indexed: 05/03/2023]
Abstract
Materials engineered to elicit targeted cellular responses in regenerative medicine must display bioligands with precise spatial and temporal control. Although materials with temporally regulated presentation of bioadhesive ligands using external triggers, such as light and electric fields, have recently been realized for cells in culture, the impact of in vivo temporal ligand presentation on cell-material responses is unknown. Here, we present a general strategy to temporally and spatially control the in vivo presentation of bioligands using cell-adhesive peptides with a protecting group that can be easily removed via transdermal light exposure to render the peptide fully active. We demonstrate that non-invasive, transdermal time-regulated activation of cell-adhesive RGD peptide on implanted biomaterials regulates in vivo cell adhesion, inflammation, fibrous encapsulation, and vascularization of the material. This work shows that triggered in vivo presentation of bioligands can be harnessed to direct tissue reparative responses associated with implanted biomaterials.
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Affiliation(s)
- Ted T. Lee
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - José R. García
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Julieta Paez
- Max-Planck-Institut für Polymerforschung, Mainz 55128, Germany
| | - Ankur Singh
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Edward A. Phelps
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Simone Weis
- Max-Planck-Institut für Polymerforschung, Mainz 55128, Germany
| | - Zahid Shafiq
- Max-Planck-Institut für Polymerforschung, Mainz 55128, Germany
| | - Asha Shekaran
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | | | - Andrés J. García
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
- Correspondence and requests for materials should be addressed to A.J.G.
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52
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Liu F, Luber EJ, Huck LA, Olsen BC, Buriak JM. Nanoscale plasmonic stamp lithography on silicon. ACS NANO 2015; 9:2184-93. [PMID: 25654172 DOI: 10.1021/acsnano.5b00312] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Nanoscale lithography on silicon is of interest for applications ranging from computer chip design to tissue interfacing. Block copolymer-based self-assembly, also called directed self-assembly (DSA) within the semiconductor industry, can produce a variety of complex nanopatterns on silicon, but these polymeric films typically require transformation into functional materials. Here we demonstrate how gold nanopatterns, produced via block copolymer self-assembly, can be incorporated into an optically transparent flexible PDMS stamp, termed a plasmonic stamp, and used to directly functionalize silicon surfaces on a sub-100 nm scale. We propose that the high intensity electric fields that result from the localized surface plasmons of the gold nanoparticles in the plasmonic stamps upon illumination with low intensity green light, lead to generation of electron-hole pairs in the silicon that drive spatially localized hydrosilylation. This approach demonstrates how localized surface plasmons can be used to enable functionalization of technologically relevant surfaces with nanoscale control.
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Affiliation(s)
- Fenglin Liu
- Department of Chemistry, University of Alberta , 11227 Saskatchewan Drive, Edmonton, AB T6G 2G2, Canada
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53
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Tran H, Ronaldson K, Bailey NA, Lynd NA, Killops KL, Vunjak-Novakovic G, Campos LM. Hierarchically ordered nanopatterns for spatial control of biomolecules. ACS NANO 2014; 8:11846-53. [PMID: 25363506 PMCID: PMC4246004 DOI: 10.1021/nn505548n] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 11/02/2014] [Indexed: 05/30/2023]
Abstract
The development and study of a benchtop, high-throughput, and inexpensive fabrication strategy to obtain hierarchical patterns of biomolecules with sub-50 nm resolution is presented. A diblock copolymer of polystyrene-b-poly(ethylene oxide), PS-b-PEO, is synthesized with biotin capping the PEO block and 4-bromostyrene copolymerized within the polystyrene block at 5 wt %. These two handles allow thin films of the block copolymer to be postfunctionalized with biotinylated biomolecules of interest and to obtain micropatterns of nanoscale-ordered films via photolithography. The design of this single polymer further allows access to two distinct superficial nanopatterns (lines and dots), where the PEO cylinders are oriented parallel or perpendicular to the substrate. Moreover, we present a strategy to obtain hierarchical mixed morphologies: a thin-film coating of cylinders both parallel and perpendicular to the substrate can be obtained by tuning the solvent annealing and irradiation conditions.
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Affiliation(s)
- Helen Tran
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Kacey Ronaldson
- Department of Biomedical Engineering, Columbia University, New York, New York 10027, United States
| | - Nevette A. Bailey
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Nathaniel A. Lynd
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Kato L. Killops
- Edgewood Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010, United States
| | - Gordana Vunjak-Novakovic
- Department of Biomedical Engineering, Columbia University, New York, New York 10027, United States
| | - Luis M. Campos
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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54
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Amschler K, Erpenbeck L, Kruss S, Schön MP. Nanoscale integrin ligand patterns determine melanoma cell behavior. ACS NANO 2014; 8:9113-25. [PMID: 25171587 DOI: 10.1021/nn502690b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Cells use integrin receptors to adhere onto surfaces by binding to ligands such as the arginine-glycine-aspartic acid (RGD) motif. Cancer cells make use of this adhesion process, which has motivated the development of integrin-directed drugs. However, those drugs may exert paradoxical effects on tumor progression, which raises the question of how integrin function is governed in tumor cells on the nanoscale. We have utilized precisely defined and tunable RGD ligand site densities spanning 1 order of magnitude, i.e., 103 to 1145 ligand sites/μm(2), by using RGD-functionalized gold nanoparticle patterns immobilized on glass by block copolymer (micellar) nanolithography. In an αVβ3 integrin-dependent fashion, human melanoma cells spread, formed focal contacts, and reorganized cytoskeletal fibers on a physiologically relevant RGD density of 349 sites/μm(2). Intriguingly, low doses of solute RGD "shifted" the optimal densities of immobilized ligand along with corresponding melanoma cell integrin clusters and cytoskeletal changes toward those typical for "intermediate" ligand presentation. Consequently, melanoma cells were forced into a "permissive" state, optimizing interactions with suboptimal nanostructured biomimetic surfaces, thus providing an explanation for the seemingly paradoxical effects on tumor progression and a potential clue for individualized antitumoral therapies.
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Affiliation(s)
- Katharina Amschler
- Department of Dermatology, Venereology and Allergology, Georg August University , Göttingen, Germany
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55
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Fischer UC, Hentschel C, Fontein F, Stegemann L, Hoeppener C, Fuchs H, Hoeppener S. Near-field photochemical and radiation-induced chemical fabrication of nanopatterns of a self-assembled silane monolayer. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:1441-1449. [PMID: 25247126 PMCID: PMC4168865 DOI: 10.3762/bjnano.5.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 08/07/2014] [Indexed: 06/03/2023]
Abstract
A general concept for parallel near-field photochemical and radiation-induced chemical processes for the fabrication of nanopatterns of a self-assembled monolayer (SAM) of (3-aminopropyl)triethoxysilane (APTES) is explored with three different processes: 1) a near-field photochemical process by photochemical bleaching of a monomolecular layer of dye molecules chemically bound to an APTES SAM, 2) a chemical process induced by oxygen plasma etching as well as 3) a combined near-field UV-photochemical and ozone-induced chemical process, which is applied directly to an APTES SAM. All approaches employ a sandwich configuration of the surface-supported SAM, and a lithographic mask in form of gold nanostructures fabricated through colloidal sphere lithography (CL), which is either exposed to visible light, oxygen plasma or an UV-ozone atmosphere. The gold mask has the function to inhibit the photochemical reactions by highly localized near-field interactions between metal mask and SAM and to inhibit the radiation-induced chemical reactions by casting a highly localized shadow. The removal of the gold mask reveals the SAM nanopattern.
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Affiliation(s)
- Ulrich Christian Fischer
- Physikalisches Institut, Interface Physics Group, Westfälische Wilhelms-University Münster, Wilhelm Klemm Str. 10, 48149 Münster, Germany
| | - Carsten Hentschel
- Physikalisches Institut, Interface Physics Group, Westfälische Wilhelms-University Münster, Wilhelm Klemm Str. 10, 48149 Münster, Germany
| | - Florian Fontein
- Physikalisches Institut, Interface Physics Group, Westfälische Wilhelms-University Münster, Wilhelm Klemm Str. 10, 48149 Münster, Germany
| | - Linda Stegemann
- Physikalisches Institut, Interface Physics Group, Westfälische Wilhelms-University Münster, Wilhelm Klemm Str. 10, 48149 Münster, Germany
| | - Christiane Hoeppener
- Physikalisches Institut, Interface Physics Group, Westfälische Wilhelms-University Münster, Wilhelm Klemm Str. 10, 48149 Münster, Germany
| | - Harald Fuchs
- Physikalisches Institut, Interface Physics Group, Westfälische Wilhelms-University Münster, Wilhelm Klemm Str. 10, 48149 Münster, Germany
| | - Stefanie Hoeppener
- Laboratory of Organic and Macromolecular Chemistry (IOMC) and Jena Center for Soft Matter (JCSM), Friedrich Schiller University, Humboldtstr. 10, 07743 Jena, Germany
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56
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Meyerbröker N, Zharnikov M. Hydrogel nanomembranes as templates for patterned deposition of nanoparticles on arbitrary substrates. ACS APPLIED MATERIALS & INTERFACES 2014; 6:14729-14735. [PMID: 25019522 DOI: 10.1021/am504358a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Patterns of nanoparticles (NPs) on solid supports are usually restricted to a particular substrate or a class of substrates. Here we present a procedure that decouples the patterning step from the target substrate, enabling the fabrication of custom designed NP assemblies on nearly any solid support, including nonflat ones. The procedure relies on a hydrogel template prepared on the primary, conductive substrate and transferred to the target support as a sacrificial nanomembrane. The template is structured by electron beam lithography (EBL) which seals predefined areas of poly(ethylene glycol) based hydrogel film, making them inert to NP deposition in contrast to pristine areas that adsorb NPs in high densities. The deposition of NPs, occurring from an aqueous solution into the transferred membrane, follows EBL generated structure, delivering the desired NP pattern on the target support after removal of the organic matrix. Efficiency and flexibility of the procedure is illustrated by creating a variety of representative submicrometer patterns of densely packed gold and silver NPs on glass, including a useful pattern of a miniaturized quick-response code. The arrangement of NPs in these patterns corresponds to the negative image of EBL generated template. This significantly reduces the exposure time for designs where large areas covered with NPs are separated by thin, NP-free stripes.
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Affiliation(s)
- Nikolaus Meyerbröker
- Applied Physical Chemistry, Heidelberg University , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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57
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Abstract
Blood is renewed throughout the entire life. The stem cells of the blood, called hematopoietic stem cells (HSCs), are responsible for maintaining a supply of all types of fresh blood cells. In contrast to other stem cells, the clinical application of these cells is well established and HSC transplantation is an established life-saving therapy for patients suffering from haematological disorders. Despite their efficient functionality throughout life in vivo, controlling HSC behaviour in vitro (including their proliferation and differentiation) is still a major task that has not been resolved with standard cell culture systems. Targeted HSC multiplication in vitro could be beneficial for many patients, because HSC supply is limited. The biology of these cells and their natural microenvironment - their niche - remain a matter of ongoing research. In recent years, evidence has come to light that HSCs are susceptible to physical stimuli. This makes the regulation of HSCs by engineering physical parameters a promising approach for the targeted manipulation of these cells for clinical applications. Nevertheless, the biophysical regulation of these cells is still poorly understood. This review sheds light on the role of biophysical parameters in HSC biology and outlines which knowledge on biophysical regulation identified in other cell types could be applied to HSCs.
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Affiliation(s)
- C Lee-Thedieck
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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58
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Lee J, Seo J, Kim D, Shin S, Lee S, Mahata C, Lee HS, Min BW, Lee T. Capillary force-induced glue-free printing of Ag nanoparticle arrays for highly sensitive SERS substrates. ACS APPLIED MATERIALS & INTERFACES 2014; 6:9053-9060. [PMID: 24824186 DOI: 10.1021/am5000382] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The fabrication of well-ordered metal nanoparticle structures onto a desired substrate can be effectively applied to several applications. In this work, well-ordered Ag nanoparticle line arrays were printed on the desired substrate without the use of glue materials. The success of the method relies on the assembly of Ag nanoparticles on the anisotropic buckling templates and a special transfer process where a small amount of water rather than glue materials is employed. The anisotropic buckling templates can be made to have various wavelengths by changing the degree of prestrain in the fabrication step. Ag nanoparticles assembled in the trough of the templates via dip coating were successfully transferred to a flat substrate which has hydrophilic surface due to capillary forces of water. The widths of the fabricated Ag nanoparticle line arrays were modulated according to the wavelengths of the templates. As a potential application, the Ag nanoparticle line arrays were used as SERS substrates for various probing molecules, and an excellent surface-enhanced Raman spectroscopy (SERS) performance was achieved with a detection limit of 10(-12) M for Rhodamine 6G.
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Affiliation(s)
- Jaehong Lee
- Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 120-749, Republic of Korea
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59
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Adutler-Lieber S, Zaretsky I, Platzman I, Deeg J, Friedman N, Spatz JP, Geiger B. Engineering of synthetic cellular microenvironments: implications for immunity. J Autoimmun 2014; 54:100-11. [PMID: 24951031 DOI: 10.1016/j.jaut.2014.05.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Accepted: 05/19/2014] [Indexed: 01/01/2023]
Abstract
In this article, we discuss novel synthetic approaches for studying the interactions of cells with their microenvironment. Notably, critical cellular processes such as growth, differentiation, migration, and fate determination, are tightly regulated by interactions with neighboring cells, and the surrounding extracellular matrix. Given the huge complexity of natural cellular environments, and their rich molecular and physical diversity, the mission of understanding "environmental signaling" at a molecular-mechanistic level appears to be extremely challenging. To meet these challenges, attempts have been made in recent years to design synthetic matrices with defined chemical and physical properties, which, artificial though they may be, could reveal basic "design principles" underlying the physiological processes. Here, we summarize recent developments in the characterization of the chemical and physical properties of cell sensing and adhesion, as well as the design and use of engineered, micro- to nanoscale patterned and confined environments, for systematic, comprehensive modulation of the cells' environment. The power of these biomimetic surfaces to highlight environmental signaling events in cells, and in immune cells in particular, will be discussed.
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Affiliation(s)
- Shimrit Adutler-Lieber
- Department of Molecular Cell Biology, Weizmann Institute of Science, 234 Herzl St., Rehovot 7610001, Israel.
| | - Irina Zaretsky
- Department of Immunology, Weizmann Institute of Science, 234 Herzl St., Rehovot 7610001, Israel.
| | - Ilia Platzman
- Max Planck Institute for Intelligent Systems & University of Heidelberg, Heisenbergstr. 3, 70569 Stuttgart, Germany.
| | - Janosch Deeg
- Max Planck Institute for Intelligent Systems & University of Heidelberg, Heisenbergstr. 3, 70569 Stuttgart, Germany.
| | - Nir Friedman
- Department of Immunology, Weizmann Institute of Science, 234 Herzl St., Rehovot 7610001, Israel.
| | - Joachim P Spatz
- Max Planck Institute for Intelligent Systems & University of Heidelberg, Heisenbergstr. 3, 70569 Stuttgart, Germany.
| | - Benjamin Geiger
- Department of Molecular Cell Biology, Weizmann Institute of Science, 234 Herzl St., Rehovot 7610001, Israel.
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60
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Schenk F, Boehm H, Spatz J, Wegner SV. Dual-functionalized nanostructured biointerfaces by click chemistry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6897-905. [PMID: 24856250 PMCID: PMC4062568 DOI: 10.1021/la500766t] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The presentation of biologically active molecules at interfaces has made it possible to investigate the responses of cells to individual molecules in their matrix at a given density and spacing. However, more sophisticated methods are needed to create model surfaces that present more than one molecule in a controlled manner in order to mimic at least partially the complexity given in natural environments. Herein, we present dual-functionalized surfaces combining quasi-hexagonally arranged gold nanoparticles with defined spacings and a newly developed PEG-alkyne coating to functionalize the glass in the intermediate space. The PEG-alkyne coating provides an inert background for cell interactions but can be modified orthogonally to the gold nanoparticles with numerous azides, including spectroscopically active molecules, peptides, and biotin at controlled densities by the copper(I)-catalyzed azide alkyne click reaction. The simultaneous presentation of cRGD on the gold nanoparticles with 100 nm spacing and synergy peptide PHSRN in the space between has a striking effect on REF cell adhesion; cells adhere, spread, and form mature focal adhesions on the dual-functionalized surfaces, whereas cells cannot adhere on either monofunctional surface. Combining these orthogonal functionalization methods creates a new platform to study precisely the crosstalk and synergy between different signaling molecules and clustering effects in ligand-receptor interactions.
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Affiliation(s)
- Franziska
C. Schenk
- Department
of New Materials and Biosystems, Max-Planck-Institute
for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, Im Neuenheimer
Feld 253, D-69120 Heidelberg, Germany
| | - Heike Boehm
- Department
of New Materials and Biosystems, Max-Planck-Institute
for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, Im Neuenheimer
Feld 253, D-69120 Heidelberg, Germany
| | - Joachim
P. Spatz
- Department
of New Materials and Biosystems, Max-Planck-Institute
for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, Im Neuenheimer
Feld 253, D-69120 Heidelberg, Germany
| | - Seraphine V. Wegner
- Department
of New Materials and Biosystems, Max-Planck-Institute
for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, Im Neuenheimer
Feld 253, D-69120 Heidelberg, Germany
- E-mail: . Phone: + 49 6221 544935
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61
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Janson IA, Putnam AJ. Extracellular matrix elasticity and topography: material-based cues that affect cell function via conserved mechanisms. J Biomed Mater Res A 2014; 103:1246-58. [PMID: 24910444 DOI: 10.1002/jbm.a.35254] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 05/31/2014] [Indexed: 12/15/2022]
Abstract
Chemical, mechanical, and topographic extracellular matrix (ECM) cues have been extensively studied for their influence on cell behavior. These ECM cues alter cell adhesion, cell shape, and cell migration and activate signal transduction pathways to influence gene expression, proliferation, and differentiation. ECM elasticity and topography, in particular, have emerged as material properties of intense focus based on strong evidence these physical cues can partially dictate stem cell differentiation. Cells generate forces to pull on their adhesive contacts, and these tractional forces appear to be a common element of cells' responses to both elasticity and topography. This review focuses on recently published work that links ECM topography and mechanics and their influence on differentiation and other cell behaviors. We also highlight signaling pathways typically implicated in mechanotransduction that are (or may be) shared by cells subjected to topographic cues. Finally, we conclude with a brief discussion of the potential implications of these commonalities for cell based therapies and biomaterial design.
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Affiliation(s)
- Isaac A Janson
- Department of Material Science and Engineering, University of Michigan, Ann Arbor, Michigan, 48109
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62
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A photoactivatable nanopatterned substrate for analyzing collective cell migration with precisely tuned cell-extracellular matrix ligand interactions. PLoS One 2014; 9:e91875. [PMID: 24632806 PMCID: PMC3954836 DOI: 10.1371/journal.pone.0091875] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 02/17/2014] [Indexed: 11/19/2022] Open
Abstract
Collective cell migration is involved in many biological and pathological processes. Various factors have been shown to regulate the decision to migrate collectively or individually, but the impact of cell-extracellular matrix (ECM) interactions is still debated. Here, we developed a method for analyzing collective cell migration by precisely tuning the interactions between cells and ECM ligands. Gold nanoparticles are arrayed on a glass substrate with a defined nanometer spacing by block copolymer micellar nanolithography (BCML), and photocleavable poly(ethylene glycol) (Mw = 12 kDa, PEG12K) and a cyclic RGD peptide, as an ECM ligand, are immobilized on this substrate. The remaining glass regions are passivated with PEG2K-silane to make cells interact with the surface via the nanoperiodically presented cyclic RGD ligands upon the photocleavage of PEG12K. On this nanostructured substrate, HeLa cells are first patterned in photo-illuminated regions, and cell migration is induced by a second photocleavage of the surrounding PEG12K. The HeLa cells gradually lose their cell-cell contacts and become disconnected on the nanopatterned substrate with 10-nm particles and 57-nm spacing, in contrast to their behavior on the homogenous substrate. Interestingly, the relationship between the observed migration collectivity and the cell-ECM ligand interactions is the opposite of that expected based on conventional soft matter models. It is likely that the reduced phosphorylation at tyrosine-861 of focal adhesion kinase (FAK) on the nanopatterned surface is responsible for this unique migration behavior. These results demonstrate the usefulness of the presented method in understanding the process of determining collective and non-collective migration features in defined micro- and nano-environments and resolving the crosstalk between cell-cell and cell-ECM adhesions.
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63
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Kruss S, Erpenbeck L, Amschler K, Mundinger TA, Boehm H, Helms HJ, Friede T, Andrews RK, Schön MP, Spatz JP. Adhesion maturation of neutrophils on nanoscopically presented platelet glycoprotein Ibα. ACS NANO 2013; 7:9984-96. [PMID: 24093566 PMCID: PMC4122703 DOI: 10.1021/nn403923h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Neutrophilic granulocytes play a fundamental role in cardiovascular disease. They interact with platelet aggregates via the integrin Mac-1 and the platelet receptor glycoprotein Ibα (GPIbα). In vivo, GPIbα presentation is highly variable under different physiological and pathophysiological conditions. Here, we quantitatively determined the conditions for neutrophil adhesion in a biomimetic in vitro system, which allowed precise adjustment of the spacings between human GPIbα presented on the nanoscale from 60 to 200 nm. Unlike most conventional nanopatterning approaches, this method provided control over the local receptor density (spacing) rather than just the global receptor density. Under physiological flow conditions, neutrophils required a minimum spacing of GPIbα molecules to successfully adhere. In contrast, under low-flow conditions, neutrophils adhered on all tested spacings with subtle but nonlinear differences in cell response, including spreading area, spreading kinetics, adhesion maturation, and mobility. Surprisingly, Mac-1-dependent neutrophil adhesion was very robust to GPIbα density variations up to 1 order of magnitude. This complex response map indicates that neutrophil adhesion under flow and adhesion maturation are differentially regulated by GPIbα density. Our study reveals how Mac-1/GPIbα interactions govern cell adhesion and how neutrophils process the number of available surface receptors on the nanoscale. In the future, such in vitro studies can be useful to determine optimum therapeutic ranges for targeting this interaction.
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Affiliation(s)
- Sebastian Kruss
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, and Institute of Physical Chemistry, Heidelberg University, Heisenbergstraße 3, Stuttgart 70569, Germany
| | - Luise Erpenbeck
- Department of Dermatology, Venereology and Allergology, University Medical Center Göttingen, 40 Robert-Koch-Straße, Göttingen 37075, Germany
| | - Katharina Amschler
- Department of Dermatology, Venereology and Allergology, University Medical Center Göttingen, 40 Robert-Koch-Straße, Göttingen 37075, Germany
| | - Tabea A. Mundinger
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, and Institute of Physical Chemistry, Heidelberg University, Heisenbergstraße 3, Stuttgart 70569, Germany
| | - Heike Boehm
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, and Institute of Physical Chemistry, Heidelberg University, Heisenbergstraße 3, Stuttgart 70569, Germany
| | - Hans-Joachim Helms
- Department of Medical Statistics, University Medical Center Göttingen, 32 Humboldtallee, Göttingen 37073, Germany
| | - Tim Friede
- Department of Medical Statistics, University Medical Center Göttingen, 32 Humboldtallee, Göttingen 37073, Germany
| | - Robert K. Andrews
- Australian Center for Blood Diseases, Monash University, 89 Commercial Road, Melbourne 3004, Australia
| | - Michael P. Schön
- Department of Dermatology, Venereology and Allergology, University Medical Center Göttingen, 40 Robert-Koch-Straße, Göttingen 37075, Germany
- Address correspondence to ,
| | - Joachim P. Spatz
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, and Institute of Physical Chemistry, Heidelberg University, Heisenbergstraße 3, Stuttgart 70569, Germany
- Address correspondence to ,
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64
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Rahmouni S, Lindner A, Rechenmacher F, Neubauer S, Sobahi TRA, Kessler H, Cavalcanti-Adam EA, Spatz JP. Hydrogel micropillars with integrin selective peptidomimetic functionalized nanopatterned tops: a new tool for the measurement of cell traction forces transmitted through αvβ3- or α5β1-integrins. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:5869-74. [PMID: 23913640 PMCID: PMC3915041 DOI: 10.1002/adma.201301338] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 05/28/2013] [Indexed: 05/26/2023]
Abstract
Poly(ethylene glycol) micropillars with gold nanopatterns on top are functionalized with two integrin selective ligands. This platform is a powerful new tool to determine the specific contribution of traction forces involved in cell adhesion mediated by α5β1- and αvβ3-integrins. Cells adherent via α5β1-integrins have a tendency to exert higher maximum forces than cells adhering via αvβ3-integrins.
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Affiliation(s)
- Sabri Rahmouni
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany; Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, 69120, Heidelberg, Germany
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65
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Fiedler J, Özdemir B, Bartholomä J, Plettl A, Brenner RE, Ziemann P. The effect of substrate surface nanotopography on the behavior of multipotnent mesenchymal stromal cells and osteoblasts. Biomaterials 2013; 34:8851-9. [DOI: 10.1016/j.biomaterials.2013.08.010] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 08/03/2013] [Indexed: 12/13/2022]
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66
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Ordered gold nanoparticle arrays on glass and their characterization. J Colloid Interface Sci 2013; 410:1-10. [DOI: 10.1016/j.jcis.2013.07.070] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 07/17/2013] [Accepted: 07/29/2013] [Indexed: 12/17/2022]
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67
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Deeg J, Axmann M, Matic J, Liapis A, Depoil D, Afrose J, Curado S, Dustin M, Spatz JP. T cell activation is determined by the number of presented antigens. NANO LETTERS 2013; 13:5619-26. [PMID: 24117051 PMCID: PMC3828117 DOI: 10.1021/nl403266t] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Revised: 10/05/2013] [Indexed: 05/18/2023]
Abstract
Antigen recognition is a key event during T cell activation. Here, we introduce nanopatterned antigen arrays that mimic the antigen presenting cell surface during T cell activation. The assessment of activation related events revealed the requirement of a minimal density of 90-140 stimulating major histocompatibility complex class II proteins (pMHC) molecules per μm(2). We demonstrate that these substrates induce T cell responses in a pMHC dose-dependent manner and that the number of presented pMHCs dominates over local pMHC density.
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Affiliation(s)
- Janosch Deeg
- Department
of New Materials and Biosystems, Max Planck
Institute for Intelligent Systems, Heisenbergstraße 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, INF 253, D-69120 Heidelberg, Germany
| | - Markus Axmann
- Department
of New Materials and Biosystems, Max Planck
Institute for Intelligent Systems, Heisenbergstraße 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, INF 253, D-69120 Heidelberg, Germany
| | - Jovana Matic
- Department
of New Materials and Biosystems, Max Planck
Institute for Intelligent Systems, Heisenbergstraße 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, INF 253, D-69120 Heidelberg, Germany
| | - Anastasia Liapis
- Skirball
Institute of Biomolecular Medicine and Department of Pathology, New York University School of Medicine, New York, New York 10016, United States
| | - David Depoil
- Skirball
Institute of Biomolecular Medicine and Department of Pathology, New York University School of Medicine, New York, New York 10016, United States
| | - Jehan Afrose
- Skirball
Institute of Biomolecular Medicine and Department of Pathology, New York University School of Medicine, New York, New York 10016, United States
| | - Silvia Curado
- Skirball
Institute of Biomolecular Medicine and Department of Pathology, New York University School of Medicine, New York, New York 10016, United States
| | - Michael
L. Dustin
- Skirball
Institute of Biomolecular Medicine and Department of Pathology, New York University School of Medicine, New York, New York 10016, United States
- Kennedy
Institute of Rheumatology, Nuffield Department of Orthopedics, Rheumatology
and Musculoskeletal Sciences, University
of Oxford, Oxford, OX37FY, United Kingdom
| | - Joachim P. Spatz
- Department
of New Materials and Biosystems, Max Planck
Institute for Intelligent Systems, Heisenbergstraße 3, D-70569 Stuttgart, Germany
- Department
of Biophysical Chemistry, University of
Heidelberg, INF 253, D-69120 Heidelberg, Germany
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68
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Platzman I, Muth CA, Lee-Thedieck C, Pallarola D, Atanasova R, Louban I, Altrock E, Spatz JP. Surface Properties of Nanostructured Bio-Active Interfaces: Impacts of Surface Stiffness and Topography on Cell-Surface Interactions. RSC Adv 2013; 3:13293-13303. [PMID: 33791090 PMCID: PMC8009309 DOI: 10.1039/c3ra41579a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Due to their ability to confer key functions of the native extracellular matrix (ECM) poly(ethylene glycol) (PEG)-based and PEG-modified materials have been extensively used as biocompatible and biofunctionalized substrate systems to study the influence of environmental parameters on cell adhesion in vitro. Given wide-ranging recent evidence that ECM compliance influences a variety of cell functions, the detailed determination and characterization of the specific PEG surface characteristics including topography, stiffness and chemistry is required. Here, we studied two frequently used bio-active interfaces - PEG-based and PEG-modified surfaces - to elucidate the differences between the physical surface properties, which cells can sense and respond to. For this purpose, two sets of surfaces were synthesized: the first set consisted of nanopatterned glass surfaces containing cRGD-functionalized gold nanoparticles surrounded by a passivated PEG-silane layer and the second set consisted of PEG-diacrylate (PEG-DA) hydrogels decorated with cRGD-functionalized gold nanoparticlesAlthough the two sets of nanostructured materials compared here were highly similar in terms of density and geometrical distribution of the presented bio-ligands as well as in terms of mechanical bulk properties, the topography and mechanical properties of the surfaces were found to be substantially different and are described in detail. In comparison to very stiff and ultrasmooth surface properties of the PEG-passivated glasses, the mechanical properties of PEG-DA surfaces in the biologically relevant stiffness range, together with the increased surface roughness at micro- and nanoscale levels have the potential to affect cell behavior. This potential was verified by studying the adhesive behavior of hematopoietic KG-1a and rat embryonic fibroblast (REF52) cells on both surfaces.
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Affiliation(s)
- Ilia Platzman
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Christine Anna Muth
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Cornelia Lee-Thedieck
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Hermann-von Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Diego Pallarola
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Ralitsa Atanasova
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Ilia Louban
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Eva Altrock
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Joachim P Spatz
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
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69
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Lohmüller T, Xu Q, Groves JT. Nanoscale obstacle arrays frustrate transport of EphA2-Ephrin-A1 clusters in cancer cell lines. NANO LETTERS 2013; 13:3059-64. [PMID: 23668885 PMCID: PMC4007685 DOI: 10.1021/nl400874v] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Juxtacrine signaling interactions between the EphA2 receptor tyrosine kinase and its ephrin-A1 ligand contribute to healthy tissue maintenance and misregulation of this system is observed in at least 40% of human breast cancer. Hybrid live cell-supported membrane experiments in which membrane-linked ephrin-A1 displayed in supported membranes interacts with EphA2 in living cells have revealed large scale clustering of EphA2/ephrin-A1 complexes as well as their lateral transport across the cell surface during triggering. Here, we utilize 100 nm spaced hexagonally ordered arrays of gold nanodots embedded within supported membranes to present defined obstacles to the movement and assembly of EphA2 clusters. By functionalizing both the supported membrane and the nanodots with ephrin-A1, we perform a type of affinity chromatography on EphA2 signaling clusters in live cell membranes. Analysis of 10 different breast cancer cell lines reveals that EphA2 transport is most frustrated by nanodot arrays in the most diseased cell lines. These observations suggest that strong physical association among EphA2 receptors, as well as their assembly into larger clusters, correlates with and may contribute to the pathological misregulation of the EphA2/ephrin-A1 pathway in breast cancer.
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Affiliation(s)
- Theobald Lohmüller
- Department of Chemistry, Howard Hughes Medical Institute, University of California, Berkeley, California 94720
- Physical Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Qian Xu
- Biophysics Graduate Group, University of California, Berkeley, California 94720
- Physical Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Jay T. Groves
- Department of Chemistry, Howard Hughes Medical Institute, University of California, Berkeley, California 94720
- Biophysics Graduate Group, University of California, Berkeley, California 94720
- Physical Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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70
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Pearson AC, Linford MR, Harb JN, Davis RC. Dual patterning of a poly(acrylic acid) layer by electron-beam and block copolymer lithographies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7433-7438. [PMID: 23342948 DOI: 10.1021/la304486x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We show the controllable patterning of palladium nanoparticles in both one and two dimensions using electron-beam lithography and reactive ion etching of a thin film of poly(acrylic acid) (PAA). After the initial patterning of the PAA, a monolayer of polystyrene-b-poly-2-vinylpyridine micelles is spun cast onto the surface. A short reactive ion etch is then used to transfer the micelle pattern into the patterned poly(acrylic acid). Finally, PdCl2 is loaded from solution into the patterned poly(acrylic acid) features, and a reactive-ion etching process is used to remove the remaining polymer and form Pd nanoparticles. This method yields location-controlled patches of nanoparticles, including single- and double-file lines and nanoparticle pairs. A locational accuracy of 9 nm or less in one direction was achieved by optimizing the size of the PAA features.
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Affiliation(s)
- Anthony C Pearson
- Department of Physics and Astronomy, Brigham Young University, Provo, Utah, USA
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71
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Bruinink A, Bitar M, Pleskova M, Wick P, Krug HF, Maniura-Weber K. Addition of nanoscaled bioinspired surface features: A revolution for bone related implants and scaffolds? J Biomed Mater Res A 2013; 102:275-94. [PMID: 23468287 DOI: 10.1002/jbm.a.34691] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 01/16/2013] [Accepted: 02/11/2013] [Indexed: 11/08/2022]
Abstract
Our expanding ability to handle the "literally invisible" building blocks of our world has started to provoke a seismic shift on the technology, environment and health sectors of our society. During the last two decades, it has become increasingly evident that the "nano-sized" subunits composing many materials—living, natural and synthetic—are becoming more and more accessible for predefined manipulations at the nanosize scale. The use of equally nanoscale sized or functionalised tools may, therefore, grant us unprecedented prospects to achieve many therapeutic aims. In the past decade it became clear that nano-scale surface topography significantly influences cell behaviour and may, potentially, be utilised as a powerful tool to enhance the bioactivity and/ or integration of implanted devices. In this review, we briefly outline the state of the art and some of the current approaches and concepts for the future utilisation of nanotechnology to create biomimetic implantable medical devices and scaffolds for in vivo and in vitro tissue engineering,with a focus on bone. Based on current knowledge it must be concluded that not the materials and surfaces themselves but the systematic biological evaluation of these new material concepts represent the bottleneck for new biomedical product development based on nanotechnological principles.
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Affiliation(s)
- Arie Bruinink
- Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Materials - Biology Interaction, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
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72
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Kristensen SH, Pedersen GA, Ogaki R, Bochenkov V, Nejsum LN, Sutherland DS. Complex protein nanopatterns over large areas via colloidal lithography. Acta Biomater 2013; 9:6158-68. [PMID: 23333875 DOI: 10.1016/j.actbio.2013.01.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 11/20/2012] [Accepted: 01/01/2013] [Indexed: 11/15/2022]
Abstract
The patterning of biomolecules at the nanoscale provides a powerful method to investigate cellular adhesion processes. A novel method for patterning is presented that is based on colloidal monolayer templating combined with multiple and angled deposition steps. Patterns of gold and SiO2 layers are used to generate complex protein nanopatterns over large areas. Simple circular patches or more complex ring structures are produced in addition to hierarchical patterns of smaller patches. The gold regions are modified through alkanethiol chemistry, which enables the preparation of extracellular matrix proteins (vitronectin) or cellular ligands (the extracellular domain of E-cadherin) in the nanopatterns, whereas the selective poly(l-lysine)-poly(ethylene glycol) functionalization of the SiO2 matrix renders it protein repellent. Cell studies, as a proof of principle, demonstrate the potential for using sets of systematically varied samples with simpler or more complex patterns for studies of cellular adhesive behavior and reveal that the local distribution of proteins within a simple patch critically influences cell adhesion.
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Affiliation(s)
- Stine H Kristensen
- iNANO Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
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73
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Muth CA, Steinl C, Klein G, Lee-Thedieck C. Regulation of hematopoietic stem cell behavior by the nanostructured presentation of extracellular matrix components. PLoS One 2013; 8:e54778. [PMID: 23405094 PMCID: PMC3566109 DOI: 10.1371/journal.pone.0054778] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 12/18/2012] [Indexed: 01/16/2023] Open
Abstract
Hematopoietic stem cells (HSCs) are maintained in stem cell niches, which regulate stem cell fate. Extracellular matrix (ECM) molecules, which are an essential part of these niches, can actively modulate cell functions. However, only little is known on the impact of ECM ligands on HSCs in a biomimetic environment defined on the nanometer-scale level. Here, we show that human hematopoietic stem and progenitor cell (HSPC) adhesion depends on the type of ligand, i.e., the type of ECM molecule, and the lateral, nanometer-scaled distance between the ligands (while the ligand type influenced the dependency on the latter). For small fibronectin (FN)-derived peptide ligands such as RGD and LDV the critical adhesive interligand distance for HSPCs was below 45 nm. FN-derived (FN type III 7-10) and osteopontin-derived protein domains also supported cell adhesion at greater distances. We found that the expression of the ECM protein thrombospondin-2 (THBS2) in HSPCs depends on the presence of the ligand type and its nanostructured presentation. Functionally, THBS2 proved to mediate adhesion of HSPCs. In conclusion, the present study shows that HSPCs are sensitive to the nanostructure of their microenvironment and that they are able to actively modulate their environment by secreting ECM factors.
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Affiliation(s)
- Christine Anna Muth
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Heidelberg, Germany
| | - Carolin Steinl
- Section for Transplantation Immunology and Immunohematology, Center for Medical Research, University of Tübingen, Tübingen, Germany
| | - Gerd Klein
- Section for Transplantation Immunology and Immunohematology, Center for Medical Research, University of Tübingen, Tübingen, Germany
| | - Cornelia Lee-Thedieck
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Heidelberg, Germany
- Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
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74
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Saxton MJ. Wanted: a positive control for anomalous subdiffusion. Biophys J 2012; 103:2411-22. [PMID: 23260043 DOI: 10.1016/j.bpj.2012.10.038] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/23/2012] [Accepted: 10/10/2012] [Indexed: 11/25/2022] Open
Abstract
Anomalous subdiffusion in cells and model systems is an active area of research. The main questions are whether diffusion is anomalous or normal, and if it is anomalous, its mechanism. The subject is controversial, especially the hypothesis that crowding causes anomalous subdiffusion. Anomalous subdiffusion measurements would be strengthened by an experimental standard, particularly one able to cross-calibrate the different types of measurements. Criteria for a calibration standard are proposed. First, diffusion must be anomalous over the length and timescales of the different measurements. The length-scale is fundamental; the time scale can be adjusted through the viscosity of the medium. Second, the standard must be theoretically well understood, with a known anomalous subdiffusion exponent, ideally readily tunable. Third, the standard must be simple, reproducible, and independently characterizable (by, for example, electron microscopy for nanostructures). Candidate experimental standards are evaluated, including obstructed lipid bilayers; aqueous systems obstructed by nanopillars; a continuum percolation system in which a prescribed fraction of randomly chosen obstacles in a regular array is ablated; single-file diffusion in pores; transient anomalous subdiffusion due to binding of particles in arrays such as transcription factors in randomized DNA arrays; and computer-generated physical trajectories.
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Affiliation(s)
- Michael J Saxton
- Department of Biochemistry and Molecular Medicine, University of California at Davis, Davis, California, USA.
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75
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Zhu M, Baffou G, Meyerbröker N, Polleux J. Micropatterning thermoplasmonic gold nanoarrays to manipulate cell adhesion. ACS NANO 2012; 6:7227-7233. [PMID: 22808995 DOI: 10.1021/nn302329c] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The ability to reversibly control the interactions between the extracellular matrix (ECM) and cell surface receptors such as integrins would allow one to investigate reciprocal signaling circuits between cells and their surrounding environment. Engineering microstructured culture substrates functionalized with switchable molecules remains the most adopted strategy to manipulate surface adhesive properties, although these systems exhibit limited reversibility and require sophisticated preparation procedures. Here, we report a straightforward protocol to fabricate biofunctionalized micropatterned gold nanoarrays that favor one-dimensional cell migration and function as plasmonic nanostoves to physically block and orient the formation of new adhesion sites. Being reversible and not restricted spatiotemporally, thermoplasmonic approaches will open new opportunities to further study the complex connections between ECM and cells.
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Affiliation(s)
- Min Zhu
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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76
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Yabu H. Creation of Functional and Structured Polymer Particles by Self-Organized Precipitation (SORP). BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2012. [DOI: 10.1246/bcsj.20110197] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroshi Yabu
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST)
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77
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Abstract
The actual progress towards biological chip devices consisting of nanostructured functional entities is summarized. The practical aspects of molecular nanobiochips are discussed, including the main surface chemistry platforms, as well as conventional and unconventional fabrication tools. Several successful biological demonstrations of the first generation of nanobiochip devices (mainly, different nanoarrays) are highlighted with the aim of revealing the potential of this technology in life sciences, medicine, and related areas.
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Affiliation(s)
- Ramūnas Valiokas
- Department of Nanoengineering, Center for Physical Sciences and Technology, Savanorių 231, 02300 Vilnius, Lithuania.
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78
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Nanomaterials for Sensing Applications: Introduction and Perspective. SPRINGER SERIES ON CHEMICAL SENSORS AND BIOSENSORS 2012. [DOI: 10.1007/5346_2012_41] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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79
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Tanne J, Schäfer D, Khalid W, Parak WJ, Lisdat F. Light-Controlled Bioelectrochemical Sensor Based on CdSe/ZnS Quantum Dots. Anal Chem 2011; 83:7778-85. [DOI: 10.1021/ac201329u] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- J. Tanne
- Biosystems Technology, Technical University Wildau, 15745 Wildau, Germany
| | - D. Schäfer
- Biosystems Technology, Technical University Wildau, 15745 Wildau, Germany
| | - W. Khalid
- Philips University Marburg, Marburg, Germany
| | - W. J. Parak
- Philips University Marburg, Marburg, Germany
| | - F. Lisdat
- Biosystems Technology, Technical University Wildau, 15745 Wildau, Germany
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