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González-García C, Cantini M, Ballester-Beltrán J, Altankov G, Salmerón-Sánchez M. The strength of the protein-material interaction determines cell fate. Acta Biomater 2018; 77:74-84. [PMID: 30006313 DOI: 10.1016/j.actbio.2018.07.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 06/06/2018] [Accepted: 07/09/2018] [Indexed: 01/06/2023]
Abstract
Extracellular matrix (ECM) proteins are key mediators of cell/material interactions. The surface density and conformation of these proteins adsorbed on the material surface influence cell adhesion and the cellular response. We have previously shown that subtle variations in surface chemistry lead to drastic changes in the conformation of adsorbed fibronectin (FN). On poly(ethyl acrylate) (PEA), FN unfolds and displays domains for cell adhesion and FN-FN interaction, whereas on poly(methyl acrylate) (PMA) - with only one methyl group less - FN remains globular as it is in solution. The effect of the strength of the protein/material interaction in cell response, and its relation to protein density and conformation, has received limited attention so far. In this work, we used FN-functionalized AFM cantilevers to evaluate, via force spectroscopy, the strength of interaction between fibronectin and the underlying polymer which controls FN conformation (PEA and PMA). We found that the strength of FN/PEA interaction is significantly higher than FN/PMA, which limits the mobility of FN layer on PEA, reduces the ability of cells to mechanically reorganize FN and then leads to enhanced proteolysis and degradation of the surrounding matrix with compromised cell viability. By contrast, both PEA and PMA support cell adhesion when FN density is increased and also in the presence of serum or other serum proteins, including vitronectin (VN) and bovine serum albumin (BSA), which provide a higher degree of mobility to the matrix. STATEMENT OF SIGNIFICANCE The identification of parameters influencing cell response is of paramount importance for the design of biomaterials that will act as synthetic scaffolds for cells to anchor, grow and, eventually, become specialised tissues. Cells interact with materials through an intermediate layer of proteins adsorbed on the material surface. It is known that the density and conformation of these proteins determine cell behaviour. Here we show that the strength of protein/material interactions, which has received very limited attention so far, is key to understand the cellular response to biomaterials. Very strong protein/material interactions reduce the ability of cells to mechanically reorganize proteins at the material interface which results in enhanced matrix degradation, leading ultimately to compromised cell viability.
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Affiliation(s)
| | - Marco Cantini
- Centre for the Cellular Microenvironment, University of Glasgow, Glasgow, UK
| | | | - George Altankov
- Institut de Bioenginyeria de Catalunya (IBEC), Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
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Velasco E, Monsalve-Guil L, Jimenez A, Ortiz I, Moreno-Muñoz J, Nuñez-Marquez E, Pegueroles M, Pérez RA, Gil FJ. Importance of the Roughness and Residual Stresses of Dental Implants on Fatigue and Osseointegration Behavior. In Vivo Study in Rabbits. J ORAL IMPLANTOL 2016; 42:469-476. [DOI: 10.1563/aaid-joi-d-16-00088] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study focuses on the fatigue behavior and bone-implant attachment for the more usual surfaces of the different CP-titanium dental implants. The implants studied were: as-received (CTR), acid etching (AE), spark-anodization (SA), and with a grit-blasted surface (GB). Residual stresses were determined by means of X-ray diffraction. The fatigue tests were carried out at 37°C on 160 dental implants, and the stress-failure (S-N) curve was determined. The fatigue tests showed that the grit-blasting process improved fatigue life. This is a consequence of the layer of compressive residual stresses that the treatment generates in titanium surfaces. Further, our aim was to assess and compare the short- and midterm bone regenerative potential and mechanical retention of the implants in bone of New Zealand rabbits. The mechanical retention after 4 and 10 weeks of implantation was evaluated with histometric and pull-out tests, respectively, as a measure of the osseointegration of the implants. The results demonstrated that the GB treatment produced microrough that accelerated bone tissue regeneration and increased mechanical retention in the bone bed at short periods of implantation in comparison with all other implants tested. The GB surface produced an improvement in mechanical long-time behavior and improved bone growth. These types of treated implants can have great potential in clinical applications, as evidenced by the outcomes of the current study.
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Affiliation(s)
- Eugenio Velasco
- Master de Implantología, Facultad de Odontología, Universidad de Sevilla, Spain
| | | | - Alvaro Jimenez
- Master de Implantología, Facultad de Odontología, Universidad de Sevilla, Spain
| | - Iván Ortiz
- Master de Implantología, Facultad de Odontología, Universidad de Sevilla, Spain
| | - Jesús Moreno-Muñoz
- Master de Implantología, Facultad de Odontología, Universidad de Sevilla, Spain
| | | | - Marta Pegueroles
- Dept. Ciència dels Materials i Enginyería Metal.lúrgica, E.T.S. Enginyeria Industrial, Universitat Politècnica de Cataluña, Barcelona, Spain
| | - Román A. Pérez
- School of Dentistry, Universitat Internacional de Catalunya, Barcelona, Spain
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Suitable Materials for Soft Tissue Reconstruction: In Vitro Studies of Cell – Triblock Copolymer Interactions. J BIOACT COMPAT POL 2016. [DOI: 10.1177/0883911505058608] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Keratinocytes and fibroblasts have been grown onto a series of triblock copolymers based on 1,5-dioxepan-2-one (DXO) and L-lactide (LLA). The molar ratio of DXO and LLA were varied in the copolymers. This resulted in different degrees of hydrophilicity, which in turn influenced the cell growth. On these surfaces, the morphological appearance of the cells with their cell movements and growth were investigated by means of scanning electron microscopy, time-lapse videomicroscopy and immunohistochemistry. All results clearly showed that the keratinocytes and fibroblasts adhered best to the most hydrophilic copolymers. A majority of the keratinocytes seeded on the most hydrophilic copolymer also presented a polarized morphology indicating a migration tendency. The cell growth onto these materials are interesting since a possible application for these unique materials is as polymeric membranes for guided cutaneous and/or periodontal tissue generation.
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Growth and Functionality of Cells Cultured on Conducting and Semi-Conducting Surfaces Modified with Self-Assembled Monolayers (SAMs). COATINGS 2016. [DOI: 10.3390/coatings6010009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kim JH, Choi YW, Kim MS, Um HS, Lee SH, Kim P, Suh KY. Repetitive cleavage of elastomeric membrane via controlled interfacial fracture. ACS APPLIED MATERIALS & INTERFACES 2014; 6:11734-11740. [PMID: 24988493 DOI: 10.1021/am502477w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Here, we report a method of fabricating thin layer of polydimethylsiloxane (PDMS), with a thickness in the range of 60-80 nm, which can be repeatedly generated (more than 10 times) from the same block of PDMS via controlled interfacial fracture. The thin layers can be transferred to various substrates by peeling off from the bulk PDMS. The cleavage is attributed to the built-in stress at the fracture interface due to plasma treatment, resulting in the repetitive formation of the thin membranes, with no residue from processing, and with a surface roughness of ∼5 nm. We were able to demonstrate transferred patterns with controlled thickness by varying the oxygen plasma treatment conditions and the composition of bulk PDMS stamp. Using the method, we achieved residual-free patterns with submicrometer resolution for applications in biomolecule array templates.
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Affiliation(s)
- Jeong Hun Kim
- School of Mechanical and Aerospace Engineering, and ‡Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University , Seoul 151-742, Korea
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Niepel MS, Fuhrmann B, Leipner HS, Groth T. Nanoscaled surface patterns influence adhesion and growth of human dermal fibroblasts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13278-13290. [PMID: 24090166 DOI: 10.1021/la402705r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In general, there is a need for passivation of nanopatterned biomaterial surfaces if cells are intended to interact only with a feature of interest. For this reason self-assembled monolayers (SAM), varying in chain length, are used; they are highly effective in preventing protein adsorption or cell adhesion. In addition, a simple and cost-effective technique to design nanopatterns of various sizes and distances, the so-called nanosphere lithography (NSL), is discussed, which allows the control of cell adhesion and growth depending on the feature dimensions. Combining both techniques results in highly selective nanostructured surfaces, showing that single proteins selectively adsorb on activated nanopatterns. Additionally, adhesion and growth of normal human dermal fibroblasts (NHDF) is strongly affected by the nanostructure dimensions, and it is proven that fibronectin (FN) matrix formation of these cells is influenced, too. Moreover, the FN fibrils are linked to the hexagonally close-packed nanopatterns. As a result, the system presented here can be applied in tissue engineering and implant design due to the fact that the nanopattern dimensions give rise to further modifications and allow the introduction of chemical heterogeneity to guide stem cell differentiation in the future.
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Affiliation(s)
- Marcus S Niepel
- Institute of Pharmacy, Biomedical Materials Group, and ‡Center of Materials Science, Martin Luther University Halle-Wittenberg , D-06099 Halle (Saale), Germany
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Llopis-Hernández V, Rico P, Moratal D, Altankov G, Salmerón-Sánchez M. Role of material-driven fibronectin fibrillogenesis in protein remodeling. Biores Open Access 2013; 2:364-73. [PMID: 24083092 PMCID: PMC3776618 DOI: 10.1089/biores.2013.0017] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Protein remodeling at the cell–material interface is an important phenomenon that should be incorporated into the design of advanced biomaterials for tissue engineering. In this work, we address the relationship between fibronectin (FN) activity at the material interface and remodeling, including proteolytic cascades. To do so, we studied FN adsorption on two chemically similar substrates, poly(ethyl acrylate) (PEA) and poly(methyl acrylate) (PMA), which resulted in different distribution and conformation of the protein at the material interface: FN organized spontaneously upon adsorption on PEA into physiological-like fibrils, through a process called material-driven FN fibrillogenesis. The amount of adsorbed FN and its conformation were investigated in two different coating concentrations (2 and 20 μg/mL). Since FN activity at the material interface determines the initial cellular response, we followed the formation of focal adhesions (vinculin) and subsequent cell signaling by focal adhesion kinase (FAK) expression and its phosphorylation (pFAK). More detailed studies were performed to get further insights into integrin binding by crosslinking and extraction followed by immunofluorescence, as well as protein and gene expression for α5 and αv. To correlate cell adhesion with matrix degradation, gene expression and activity (zymography) of matrix metalloproteinases (MMPs) were measured. Overall, we demonstrated that the material-driven FN fibrillogenesis triggers proteolytic activity: MMP activity was higher on the material-driven FN fibrils, as a compensatory mechanism to the inability of cells to reorganize this FN network.
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Affiliation(s)
- Virginia Llopis-Hernández
- Center for Biomaterials and Tissue Engineering, Universitat Politècnica de València , Valencia, Spain
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Schlie-Wolter S, Ngezahayo A, Chichkov BN. The selective role of ECM components on cell adhesion, morphology, proliferation and communication in vitro. Exp Cell Res 2013; 319:1553-61. [DOI: 10.1016/j.yexcr.2013.03.016] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 03/01/2013] [Accepted: 03/13/2013] [Indexed: 10/26/2022]
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Dorsal and Ventral Stimuli in Cell–Material Interactions: Effect on Cell Morphology. Biointerphases 2012; 7:39. [DOI: 10.1007/s13758-012-0039-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2012] [Accepted: 05/15/2012] [Indexed: 10/28/2022] Open
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Krasteva N, Seifert B, Hopp M, Malsch G, Albrecht W, Altankov G, Groth T. Membranes for biohybrid liver support: the behaviour of C3A hepatoblastoma cells is dependent on the composition of acrylonitrile copolymers. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 16:1-22. [PMID: 15796302 DOI: 10.1163/1568562052843348] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Co-polymers based on acrylonitrile, N-vinylpyrrolidone, aminoethylmethacrylate and sodium methallylsulfonate were used to prepare flat membranes by phase inversion. The surface properties of membranes were characterised by water contact angle measurements, atomic force microscopy and X-ray photoelectron spectroscopy (XPS). Membrane permeability was estimated by porosity measurements with water as test liquid. Human C3A hepatoblastoma cells were plated on these materials. Cell-material interaction was characterised by overall cell morphology, formation of focal adhesion contacts and intercellular junctions. Furthermore, cell proliferation was measured and compared with the functional activity of cells as indicated by 7-ethoxycoumarin-O-deethylation. More hydrophilic materials reduced spreading of cells, formation of focal adhesion and subsequent proliferation while homotypic cell adhesion was facilitated in correlation with stronger expressions of intercellular junctions and improved functional activity. In contrast, membranes with stronger adhesivity enhanced cell proliferation but reduced the functional activity of cells. It was concluded that the co-polymerisation of acrylonitrile with hydrophilic co-monomers, such as N-vinylpyrrolidone, could be used to tailor membrane materials for the application in biohybrid liver support systems.
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Affiliation(s)
- N Krasteva
- Institute of Biophysics, Bulgarian Academy of Sciences, Str. Acad. G. Bonchev, bl. 21, BG-1113 Sofia, Bulgaria
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Ribeiro C, Panadero JA, Sencadas V, Lanceros-Méndez S, Tamaño MN, Moratal D, Salmerón-Sánchez M, Gómez Ribelles JL. Fibronectin adsorption and cell response on electroactive poly(vinylidene fluoride) films. Biomed Mater 2012; 7:035004. [DOI: 10.1088/1748-6041/7/3/035004] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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12
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Coelho NM, González-García C, Salmerón-Sánchez M, Altankov G. Arrangement of Type IV Collagen and Laminin on Substrates with Controlled Density of –OH Groups. Tissue Eng Part A 2011; 17:2245-57. [DOI: 10.1089/ten.tea.2010.0713] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
- Nuno Miranda Coelho
- Institut de Bioenginyeria de Catalunya, Barcelona, Spain
- Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Cristina González-García
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain
- Center for Biomaterials, Universidad Politécnica de Valencia, Valencia, Spain
| | - Manuel Salmerón-Sánchez
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain
- Center for Biomaterials, Universidad Politécnica de Valencia, Valencia, Spain
| | - George Altankov
- Institut de Bioenginyeria de Catalunya, Barcelona, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain
- ICREA (Institució Catalana de Recerca i Estudis Avançats), Catalonia, Spain
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Llopis-Hernández V, Rico P, Ballester-Beltrán J, Moratal D, Salmerón-Sánchez M. Role of surface chemistry in protein remodeling at the cell-material interface. PLoS One 2011; 6:e19610. [PMID: 21573010 PMCID: PMC3090403 DOI: 10.1371/journal.pone.0019610] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Accepted: 04/01/2011] [Indexed: 12/26/2022] Open
Abstract
Background The cell-material interaction is a complex bi-directional and dynamic process that mimics to a certain extent the natural interactions of cells with the extracellular matrix. Cells tend to adhere and rearrange adsorbed extracellular matrix (ECM) proteins on the material surface in a fibril-like pattern. Afterwards, the ECM undergoes proteolytic degradation, which is a mechanism for the removal of the excess ECM usually approximated with remodeling. ECM remodeling is a dynamic process that consists of two opposite events: assembly and degradation. Methodology/Principal Findings This work investigates matrix protein dynamics on mixed self-assembled monolayers (SAMs) of –OH and –CH3 terminated alkanethiols. SAMs assembled on gold are highly ordered organic surfaces able to provide different chemical functionalities and well-controlled surface properties. Fibronectin (FN) was adsorbed on the different surfaces and quantified in terms of the adsorbed surface density, distribution and conformation. Initial cell adhesion and signaling on FN-coated SAMs were characterized via the formation of focal adhesions, integrin expression and phosphorylation of FAKs. Afterwards, the reorganization and secretion of FN was assessed. Finally, matrix degradation was followed via the expression of matrix metalloproteinases MMP2 and MMP9 and correlated with Runx2 levels. We show that matrix degradation at the cell material interface depends on surface chemistry in MMP-dependent way. Conclusions/Significance This work provides a broad overview of matrix remodeling at the cell-material interface, establishing correlations between surface chemistry, FN adsorption, cell adhesion and signaling, matrix reorganization and degradation. The reported findings improve our understanding of the role of surface chemistry as a key parameter in the design of new biomaterials. It demonstrates the ability of surface chemistry to direct proteolytic routes at the cell-material interface, which gains a distinct bioengineering interest as a new tool to trigger matrix degradation in different biomedical applications.
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Affiliation(s)
- Virginia Llopis-Hernández
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Valencia, Spain
| | - Patricia Rico
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Valencia, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain
| | - José Ballester-Beltrán
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Valencia, Spain
| | - David Moratal
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Valencia, Spain
| | - Manuel Salmerón-Sánchez
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Valencia, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain
- Regenerative Medicine Unit, Centro de Investigación Príncipe Felipe, Valencia, Spain
- * E-mail:
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Chemical and Physical Modifications of Biomaterial Surfaces to Control Adhesion of Cells. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/978-90-481-8790-4_13] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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15
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Spatial organization of osteoblast fibronectin matrix on titanium surfaces: effects of roughness, chemical heterogeneity and surface energy. Acta Biomater 2010; 6:291-301. [PMID: 19635598 DOI: 10.1016/j.actbio.2009.07.030] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Revised: 07/03/2009] [Accepted: 07/21/2009] [Indexed: 11/20/2022]
Abstract
We investigated the early events of bone matrix formation, and specifically the role of fibronectin (FN) in the initial osteoblast interaction and the subsequent organization of a provisional FN matrix on different rough titanium (Ti) surfaces. Fluorescein isothiocyanate-labelled FN was preadsorbed on these surfaces and studied for its three-dimensional (3-D) organization by confocal microscopy, while its amount was quantified after NaOH extraction. An irregular pattern of adsorption with a higher amount of protein on topographic peaks than on valleys was observed and attributed to the physicochemical heterogeneity of the rough Ti surfaces. MG63 osteoblast-like cells were further cultured on FN-preadsorbed Ti surfaces and an improved initial cellular interaction was observed with increasing roughness. 3-D reconstruction of the immunofluorescence images after 4 days of incubation revealed that osteoblasts deposit FN fibrils in a specific facet-like pattern that is organized within the secreted total matrix overlying the top of the samples. The thickness of this FN layer increased when the roughness of the underlying topography was increased, but not by more than half of the total maximum peak-to-valley distance, as demonstrated with images showing simultaneous reconstruction of fluorescence and topography after 7 days of cell culture.
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Pashkuleva I, Marques AP, Vaz F, Reis RL. Surface modification of starch based biomaterials by oxygen plasma or UV-irradiation. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:21-32. [PMID: 19639265 DOI: 10.1007/s10856-009-3831-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 07/16/2009] [Indexed: 05/28/2023]
Abstract
Radiation is widely used in biomaterials science for surface modification and sterilization. Herein, we describe the use of plasma and UV-irradiation to improve the biocompatibility of different starch-based blends in terms of cell adhesion and proliferation. Physical and chemical changes, introduced by the used methods, were evaluated by complementary techniques for surface analysis such as scanning electron microscopy, atomic force microscopy, contact angle analysis and X-ray photoelectron spectroscopy. The effect of the changed surface properties on the adhesion of osteoblast-like cells was studied by a direct contact assay. Generally, both treatments resulted in higher number of cells adhered to the modified surfaces. The importance of the improved biocompatibility resulting from the irradiation methods is further supported by the knowledge that both UV and plasma treatments can be used as cost-effective methods for sterilization of biomedical materials and devices.
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Affiliation(s)
- Iva Pashkuleva
- 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, University of Minho, AvePark, Taipas, Guimarães, Portugal.
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Gugutkov D, González-García C, Rodríguez Hernández JC, Altankov G, Salmerón-Sánchez M. Biological activity of the substrate-induced fibronectin network: insight into the third dimension through electrospun fibers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:10893-10900. [PMID: 19735141 DOI: 10.1021/la9012203] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Fibronectin (FN) fibrillogenesis is a cell-mediated process involving integrin activation that results in conformational changes of FN molecules and the organization of actin cytoskeleton. A similar process can be induced by some chemistries in the absence of cells, e.g., poly(ethyl acrylate) (PEA), which enhance FN-FN interactions leading to the formation of a biologically active network. Atomic force microscopy images of single FN molecules, at the early stages of adsorption on plane PEA, allow one to rationalize the process. Further, the role of the spatial organization of the FN network on the cellular response is investigated through its adsorption on electrospun fibers. Randomly oriented and aligned PEA fibers were prepared to mimic the three-dimensional organization of the extracellular matrix. The formation of the FN network on the PEA fibers but not on the supporting coverglass was confirmed. Fibroblasts aligned with oriented fibers, displayed extended morphology, developed linearly organized focal adhesion complexes, and matured actin filaments. Conversely, on random PEA fibers, cells acquired polygonal morphology with altered actin cytoskeleton but well-developed focal adhesions. Late FN matrix formation was also influenced: spatially organized FN matrix fibrils along the oriented PEA fibers and an altered arrangement on random ones.
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Affiliation(s)
- Dencho Gugutkov
- Institut de Bioenginyeria de Catalunya (IBEC), 08028 Barcelona, Spain
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Müller R, Ruhl S, Hiller KA, Schmalz G, Schweikl H. Adhesion of eukaryotic cells andStaphylococcus aureus to silicon model surfaces. J Biomed Mater Res A 2008; 84:817-27. [PMID: 17635034 DOI: 10.1002/jbm.a.31495] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Silicon wafers modified by silanisation with different functional groups are used to study the bioactivity of surfaces with varying physicochemical properties. Oxidation of the wafers created very hydrophilic surfaces, and moderately wettable surfaces were produced by coating with poly(ethylene glycol) (PEG). Immobilization of hydrocarbon chains to the wafers produced hydrophobic surfaces, and hydrophobicity was further increased by fluorocarbon coatings. The oxidized and the hydrocarbon-modified surfaces supported the adhesion of human MG-63 osteoblasts and 3T3 mouse fibroblasts as well as Staphylococcus aureus 8325-4. Adhesion of osteoblasts and fibroblasts, however, was decreased on highly hydrophobic fluorocarbon surfaces, whereas adhesion of S. aureus was supported. Coating of the fluorocarbon surface with fibronectin increased the number of attached eukaryotic cells, but the accumulation of bacteria remained unchanged. In contrast, surface coatings with PEG-groups inhibited the binding of S. aureus; however, the adhesion of the eukaryotic cells was high. The number of S. aureus on PEG-modified surfaces covered with fibronectin increased about twofold, yet it was still decreased to 25-30% related to the number of bacteria on other surfaces. These findings provide evidence that the PEG-modified surfaces showed selective bioactivity, preventing the attachment of a microbial pathogen but supporting the adhesion of eukaryotic cells.
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Affiliation(s)
- R Müller
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
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Tzoneva R, Faucheux N, Groth T. Wettability of substrata controls cell–substrate and cell–cell adhesions. Biochim Biophys Acta Gen Subj 2007; 1770:1538-47. [PMID: 17804166 DOI: 10.1016/j.bbagen.2007.07.008] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Revised: 06/20/2007] [Indexed: 01/03/2023]
Abstract
The maintenance of endothelial cell (EC) monolayer architecture requires stable adhesions not only between neighboring cells but also between cells and the extracellular matrix. While the influence of biomaterials surface wettability on cell-substratum adhesion is rather well studied, its impact on cell-cell cohesion has not been extensively investigated. In the present study a model system consisting of hydrophilic and hydrophobic glass pre-coated with fibronectin and fibrinogen was used to study the influence of surface wettability on both types of cell adhesions. It was demonstrated that the substrate wettability controls the adhesion and cytoskeletal organization of endothelial cells, which has an impact on the subsequent ability of cells to establish stable cell-cell cohesions. These effects were related to the accessibility of specific domains of the adsorbed proteins. While the hydrophobic substratum promoted cell-cell cohesion, on hydrophilic substrata cell-substrate adhesion was dominant. In addition, evidence for an influence of surface wettability on the cross talk between integrins and cadherins was found.
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Affiliation(s)
- R Tzoneva
- Institute of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bl. 108, Sofia 1113, Bulgaria
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Feng Z, Chian KS, Ong WF, Mhaisalka PS, Chan V, Ratner BD. Dual requirements of extracellular matrix protein and chitosan for inducing adhesion contact evolution of esophageal epithelia. J Biomed Mater Res A 2007; 82:788-801. [PMID: 17326135 DOI: 10.1002/jbm.a.31123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
It has been recently shown that chitosan (CHI)/collagen prostheses induced epithelization at the esophagus site of animal model. However, little is known on the biophysical mechanisms of cell adhesion on CHI-based material pertaining to esophagus tissue engineering. In this study, the adhesion contact dynamics of porcine esophageal epithelial cells seeded on CHI surface is probed using confocal-reflectance interference contrast microscopy in conjunction with phase-contrast microscopy. First of all, cells fail to form any adhesion contact on either CHI or elastin (ES)-coated surface. On CHI coated with fibronectin (CHI-FN) or elastin (CHI-ES), strong adhesion contact of cells evolved over time until they reached a steady-state level. The initial cell deformation rates of cells on CHI-FN and CHI-ES are 0.0138 and 0.0151 min(-1), respectively. Interestingly, cells on fibronectin (FN) coated substrate transiently form strong adhesion contact and eventually undergo deadhesion. Moreover, the steady-state adhesion energy of epithelial cells on CHI-FN is 1.73 and 148 times larger than that on CHI-ES and FN, respectively. The actin of cells on CHI-FN transforms from microfilament meshes at cell periphery to stress fibers throughout the cytoplasm during cell seeding. At the same time, vinculin staining demonstrated the evolution of focal adhesion complexes in cells on CHI-FN after 130 min of seeding. Interestingly, CHI-ES induces the formation of focal adhesion complexes in a lesser extent in cell but fails to lead to stress fiber formation. Overall, our study reveals that long-term adhesion contact evolution of esophageal epithelia is only triggered by both extracellular matrix protein and chitosan.
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Affiliation(s)
- Zhiqin Feng
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
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21
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Zlatanov I, Groth T, Lendlein A, Altankov G. Dynamics of beta1-integrins in living fibroblasts--effect of substratum wettability. Biophys J 2005; 89:3555-62. [PMID: 16126832 PMCID: PMC1366849 DOI: 10.1529/biophysj.105.061119] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The dynamics of integrin receptors mobility was studied in living human fibroblasts using fluorescence-labeled beta(1)-integrin monoclonal antibodies. Time-lapse image series were obtained by confocal laser scanning microscopy when cells were adhering on model hydrophilic (clean glass) and hydrophobic (octadecyl-silanized; i.e., ODS) surfaces coated with fibronectin. Direct measurements showed approximately twice-higher velocity of integrins on glass compared to ODS, and these velocities varied in different zones of the cells. A kinetic model and algorithm for quantification of images was developed, and the analysis identified three receptor populations on glass: immobilized (82.76% of all), slow (4.16%), and fast (13.08%), while, on ODS, only two were identified: immobilized (83.36%) and fast (16.64%). Fast integrins in the peripheral zone of cells have maximal velocities of 0.353 +/- 0.02 mum/min (n = 48, four cells) on hydrophilic and 0.218 +/- 0.02 mum/min (n = 30, three cells) on hydrophobic substrata. The slow population has a velocity of 0.114 mum/min (n = 48, four cells). Further analyses show that these velocities also differ significantly in the peripheral and middle zones of cells in a substrate-dependent fashion. A well-defined circular motion of receptors around the cell center expressed mainly on hydrophobic substrata was monitored and quantified as well.
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Affiliation(s)
- I Zlatanov
- Institute of Biophysics, Bulgarian Academy of Sciences, Sofia, Bulgaria
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22
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Faucheux N, Schweiss R, Lützow K, Werner C, Groth T. Self-assembled monolayers with different terminating groups as model substrates for cell adhesion studies. Biomaterials 2004; 25:2721-30. [PMID: 14962551 DOI: 10.1016/j.biomaterials.2003.09.069] [Citation(s) in RCA: 442] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2003] [Accepted: 09/04/2003] [Indexed: 10/26/2022]
Abstract
Cell shapes induced by cell-substratum interactions are linked with proliferation, differentiation or apoptosis of cells. To clarify the relevance of specific surface characteristics, we applied self-assembled monolayers (SAM) of alkyl silanes exhibiting a variety of terminating functional groups. We first characterised the SAMs on glass or silicon wafers by measuring wettability, layer thickness and roughness. Water contact angle data revealed that methyl (CH(3)), bromine (Br), and vinyl (CH=CH(2)) groups lead to hydrophobic surfaces, while amine (NH(2)) and carboxyl (COOH) functions lead to moderately wettable surfaces, and polyethylene glycol (PEG) and hydroxyl (OH) groups created wettable substrata. The surfaces were found to be molecular smooth except for one type of NH(2) surface. The SDS-PAGE analysis of proteins adsorbed from bovine serum to the SAMs showed less protein adsorption to PEG and OH than to CH(3), NH(2) and COOH. Immunoblotting revealed that a key component of adsorbed proteins is vitronectin while fibronectin was not detectable. The interaction of human fibroblasts with CH(3), PEG and OH terminated SAMs was similarly weak while strong attachment, spreading, fibronectin matrix formation and growth were observed on COOH and NH(2). The strong interaction of fibroblasts with the latter SAMs was linked to an enhanced activity of integrins as observed after antibody-tagging of living cells.
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Affiliation(s)
- N Faucheux
- GKSS Research Centre, Institute of Chemistry, Department Biomaterials, Biomedical Technology, Kantstrasse 55, D-14513 Teltow, Germany
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23
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Kowalczyńska HM, Nowak-Wyrzykowska M, Kołos R, Dobkowski J, Kamiński J. Fibronectin adsorption and arrangement on copolymer surfaces and their significance in cell adhesion. J Biomed Mater Res A 2004; 72:228-36. [PMID: 15625681 DOI: 10.1002/jbm.a.30238] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The adsorption of fibronectin (FN) to (styrene/methyl methacrylate) copolymer surfaces, both sulfonated (hydrophilic) and nonsulfonated (hydrophobic), was studied by means of the radioisotope (125I-FN) and ELISA assays; the latter employed monoclonal antibodies. It was found that the radioiodination-derived isotherms did not follow the Langmuir-type adsorption law within the FN concentration range studied; rather, a quasi-linear FN surface density versus bulk concentration dependence was observed. These isotherms, and our recent ELISA measurements with polyclonal antibodies, allowed us to estimate saturative FN surface densities, which were, within the experimental error, similar on both types of surfaces. This suggested the amount of adsorbed FN to be not responsible for observed differences in leukaemia L1210 cell adhesion (FN-coated sulfonated surfaces are far more pro-adhesive than their nonsulfonated analogues). The presumption that these differences are induced by changes in the FN arrangement was confirmed by the use of monoclonal antibodies directed against distinct FN domains, and by the blocking of alpha5beta1 integrin receptor with the synthetic Gly-Arg-Gly-Asp-Ser-Pro (GRGDSP) peptide. The RGD sequence located within the FN cell-binding domain seems to be masked in the structure adopted on nonsulfonated surfaces, which hinders the integrin-ligand interaction.
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Affiliation(s)
- Hanna M Kowalczyńska
- Department of Biophysics and Biomathematics, Medical Centre for Postgraduate Education, ul. Marymoncka 99, 01-813 Warszawa, Poland.
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24
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Tzoneva R, Heuchel M, Groth T, Altankov G, Albrecht W, Paul D. Fibrinogen adsorption and platelet interactions on polymer membranes. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2003; 13:1033-50. [PMID: 12462462 DOI: 10.1163/156856202760319171] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The hemocompatibility of four different wettable polymer membranes, namely Cuprophan (CE), polyether-polycarbonate (PC-PE), polysulfone (PSU), and polyetherimide (PEI), was investigated with respect to fibrinogen (Fng) adsorption and platelet adhesion/activation. In order to estimate the polar and dispersion components of the surface free energy, contact angles using water/vapor and water/n-hexadecane systems were measured. Adsorption of fibrinogen was studied using fluorescence-labeled protein. The adsorption isotherms showed that the amount and the affinity of adsorbed Fng increased with decreasing surface wettability of the membranes, which correlates with the dispersion and polar components of the surface free energy. The conformational changes of adsorbed Fng were detected by measuring the difference between monoclonal antibody binding to the conformation-sensitive epitope in the D-domain and the binding of polyclonal anti-Fng antibody. The anticipated conformational/orientational changes were greater for PEI and PSU membranes (the least wettable membranes) and negligible for the more wettable PC-PE and CE membranes. In addition, a possible relationship with the degree of platelet activation was found, showing negligible platelet adhesion on PC-PE and CE, but high platelet adhesion on PEI and PSU. Furthermore, platelets were spread to a large extent on PEI, while the formation of aggregates was observed on PSU. This may correspond to the anticipated differences in the conformational state of Fng on both membranes.
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Affiliation(s)
- Rumiana Tzoneva
- GKSS Forschungszentrum, Institut für Chemie, Abteilung Membranforschung, Teltow, Germany
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25
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Grainger DW, Pavon-Djavid G, Migonney V, Josefowicz M. Assessment of fibronectin conformation adsorbed to polytetrafluoroethylene surfaces from serum protein mixtures and correlation to support of cell attachment in culture. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2003; 14:973-88. [PMID: 14661874 DOI: 10.1163/156856203322381456] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Surfaces of polytetrafluoroethylene (PTFE) were exposed to buffered aqueous solutions containing radio-labeled human fibronectin ([125I]Fn), Fn/bovine serum albumin (BSA) binary mixtures of various ratios or whole human plasma dilutions for 1 h. Total adsorbed Fn and albumin adsorption following rinsing was quantified on this surface. 125I-labeled monoclonal antibodies against either the tenth type-III Fn repeat unit (containing the cell-binding RGDS integrin recognition motif) or the Fn amino-terminal domain were used to probe the accessibility of each of these respective Fn regions post-adsorption. Human umbilical vein endothelial cells (HUVECs) were cultured on PTFE surfaces pre-exposed to each of these protein adsorption conditions and compared to identical conditions on tissue culture polystyrene (TCPS). Fn adsorption to PTFE is dependent upon the concentration of albumin co-adsorbing from solution: albumin out-competes Fn for PTFE surface sites even at non-physiological Fn/HSA ratios 10-100-fold biased in Fn. Antibodies against Fn do not readily recognize Fn adsorbed on PTFE as the HSA co-adsorption concentration in either binary mixtures or in plasma increases, indicating albumin masking of adsorbed Fn. At Fn/HSA ratios rich in Fn (1:1, 1:100), albumin co-adsorption actually improves anti-Fn antibody recognition of adsorbed Fn. HUVEC attachment efficiency to PTFE after protein adsorption correlates with amounts of Fn adsorbed and levels of anti-Fn antibody recognition of Fn on PTFE, linking cell attachment to integrin recognition of both adsorbed Fn density and Fn adsorbed conformation on PTFE surfaces.
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Affiliation(s)
- David W Grainger
- Department of Chemistry, Colorado State University, Ft. Collins, CO 80523-1872, USA.
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26
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MacDonald DE, Deo N, Markovic B, Stranick M, Somasundaran P. Adsorption and dissolution behavior of human plasma fibronectin on thermally and chemically modified titanium dioxide particles. Biomaterials 2002; 23:1269-79. [PMID: 11791930 DOI: 10.1016/s0142-9612(01)00317-9] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Titanium is known for its biocompatibility and is widely used in dental and orthopedic reconstructive surgery. There are reports that osteointegration of these implants is not optimal. The objective of this study was to modify titanium dioxide particles and examine the resultant effects on protein adsorption to these altered surfaces using a model cell binding protein, human plasma fibronectin (HPF). HPF is an important matrix glycoprotein that plays a major role in cell and protein attachment, Titanium dioxide surfaces were modified by heating the titanium dioxide powder at 800 degrees C for 1 h or treating with an oxidizing agent: peroxide in ammonium hydroxide followed by peroxide in hydrochloric acid. Oxidized and control samples were further treated with 9:1 butanol:water for 30 min. Brunauer-Emmett-Teller showed no change in particle surface area as a result of thermal or chemical treatment. Hydrophobicity increased with butanol treatment of titanium dioxide. Diffuse reflectance Fourier transform infrared spectroscopy showed the presence of -CH2 and -CH3 vibrations in the region of 2850-3000 cm(-1) for both the heated, butanol and peroxide/butanol-treated samples. The absence of increased C-O and O-C=O features as determined by electron spectroscopy for chemical analysis indicates that butanol adsorption is not occurring via an esterification mechanism. The interaction between butanol and pre-heated or peroxide-treated titanium dioxide may be one of association (weak electrostatic and/or Van der Waals forces) rather than direct ionic bonding. Maximum HPF adsorption on modified or unmodified titanium dioxide occurred within 30 min, with greater protein adsorption occurring on butanol-treated samples. Desorption was minimal with all modifications. Zeta potential measurements showed that HPF adsorption caused an increase in the negative zeta potential with the greatest change noted for the butanol-treated samples. These findings suggest that wettability and surface charge both play an important role in protein adsorption to titanium dioxide. Thus, by modifying the physico-chemical properties of titanium dioxide surfaces, it may be possible to alter protein adsorption and hence optimize cell attachment.
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Affiliation(s)
- D E MacDonald
- Langmuir Center for Colloids and Interfaces, Columbia University, New York, NY 10027, USA.
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27
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Grill V, Sandrucci MA, Di Lenarda R, Cadenaro M, Narducci P, Bareggi R, Martelli AM. Biocompatibility evaluation of dental metal alloys in vitro: expression of extracellular matrix molecules and its relationship to cell proliferation rates. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 52:479-87. [PMID: 11007615 DOI: 10.1002/1097-4636(20001205)52:3<479::aid-jbm5>3.0.co;2-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The biocompatibility in vitro of dental biomaterials has been widely studied, with consideration of cell viability and cell proliferation rates. In the present study we evaluated the biocompatibility in vitro of three single-phase dental metal alloys, all provided by the same manufacturer. To this aim, we considered the percentage of proliferating cells revealed by 5-bromodeoxyuridine incorporation in human fibroblast cultures in the presence of these biomaterials, performing a short time test (72 h). These data were correlated with immunocytochemical expression of four molecules of the extracellular matrix, i.e., fibronectin, type I collagen, beta(1)-integrin subunit, and chondroitin sulfate, because the capability of cells to adhere to substrata is widely related to cell proliferation rates. Alloys presenting higher amounts of noble elements were more biocompatible even when they contained significant amount of both Ag and Cu. As regards the expression of the extracellular matrix molecules, the organization level of fibronectin in fibrils was correlated with higher cell proliferation rates, whereas no difference was detected for the expression of the other antigens. On these bases, we assume that expression of fibronectin could be a useful parameter in evaluation of biocompatibility in addition to cell proliferation capability.
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Affiliation(s)
- V Grill
- Department of Human Morphology, University of Trieste, Via Manzoni 16, I-34138 Trieste, Italy.
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28
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Altankov G, Thom V, Groth T, Jankova K, Jonsson G, Ulbricht M. Modulating the biocompatibility of polymer surfaces with poly(ethylene glycol): effect of fibronectin. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 52:219-30. [PMID: 10906695 DOI: 10.1002/1097-4636(200010)52:1<219::aid-jbm28>3.0.co;2-f] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A novel approach described earlier for improving polymer substratum biocompatibility(1) is further elucidated. Polysulfone (PSf) spin-coating films were modified by covalent end-on grafting of hydrophilic and sterically demanding photo-reactive poly(ethylene glycol) (PEG) conjugates (ABMPEG; 10 kDa). The degree of grafting density was varied systematically, yielding a wide spectrum of attained surface characteristics monitored by air-water contact angles (captive bubble method). Fibronectin (FN) adsorption was studied by in situ ellipsometry and found to decrease monotonically as ABMPEG grafting density increased. The adhesive interaction of human skin fibroblasts with these substrata and, in particular, the effect of FN precoating were investigated in detail. A clear optimum of cell-substratum interactions was found for mildly modified substrata, employing well established microscopic and immunofluorescence techniques, namely the monitoring of cell adhesion and spreading, overall cell morphology, organization of FN receptors, and focal adhesions as well as FN matrix formation. The results suggest that cell interactions with hydrophobic polymer substrata are enhanced considerably when modified with hydrophilic and sterically demanding PEG moieties at a low surface coverage due to enhanced biologic activity of adsorbed and intercalated adhesive proteins such as FN.
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Affiliation(s)
- G Altankov
- Bulgarian Academy of Sciences, Institute of Biophysics, Str. Acad. G. Bonchev, Bl. 21, BG-1113 Sofia, Bulgaria
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Bacáková L, Mares V, Bottone MG, Pellicciari C, Lisá V, Svorcík V. Fluorine ion-implanted polystyrene improves growth and viability of vascular smooth muscle cells in culture. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 49:369-79. [PMID: 10602070 DOI: 10.1002/(sici)1097-4636(20000305)49:3<369::aid-jbm10>3.0.co;2-w] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Vascular smooth muscle cells derived from the rat aorta were cultured on unmodified or F(+) ion-implanted polystyrene (5 x 10(12) or 5 x 10(14) ions/cm(2), energy 150 keV). In 1-day-old cultures, the cells adhered to the modified polystyrene in higher numbers and over larger contact areas. Increased resistance of the cells to trypsin-mediated detachment from the growth support indicated an improved adhesion of cells to the modified polymer at later culture intervals. The cells cultured on ion-modified polymers also were larger and had a higher total protein content. By use of immunocytochemistry, several specific protein species were increased, including the cytoskeletal alpha-actin and vimentin and the plasma membrane-associated vinculin, talin, alpha-v integrins, ICAM-1, and VCAM-1, which account for stronger cell-cell and cell-extracellular matrix adhesion. The lower number of cells found floating in the medium suggests that the spontaneous detachment of cells from the modified polystyrene was lower and that the viability of the adhered cell population was higher. As was shown by the two-parameter flow-cytometric measurements of BrdU incorporation and DNA content, as well as by (3)H-thymidine autoradiography, the cell proliferation on samples modified by the dose of 5 x 10(12) ions/cm(2) was similar to that in controls; and at the dose of 5 x 10(14) ions/cm(2), it tended to be even lower. The cells grown on the polymer implanted with the dose of 5 x 10(12) ions/cm(2) responded to a new artificially created cell-free area in a confluent cell layer by more intense migration whereas at the dose of 5 x 10(14) ions/cm(2), the migration ability of cells was similar to that on the unmodified polymer. The data revealed a higher biocompatibility of ion-implanted polystyrene with vascular smooth muscle cells in culture. There was better adhesion, differentiation, and survival, and there was neither excessive migration nor proliferation.
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Affiliation(s)
- L Bacáková
- Institute of Physiology, Academy of Sciences of the Czech Republic, Vídenská 1083, CZ-142 20 Prague 4 - Krc, Czech Republic.
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30
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Pierres A, Benoliel AM, Bongrand P. Interactions between biological surfaces. Curr Opin Colloid Interface Sci 1998. [DOI: 10.1016/s1359-0294(98)80028-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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