1
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β-1,4-Galactosyltransferase-V colorectal cancer biomarker immunosensor with label-free electrochemical detection. Talanta 2022; 243:123337. [DOI: 10.1016/j.talanta.2022.123337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 02/10/2022] [Accepted: 02/25/2022] [Indexed: 12/16/2022]
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2
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Martinez H, Martinez NJD, Guo J, Lujan VR, Depoy J, Brumbach MT, Brinker CJ, Bachand GD. Effects of Surface Chemistry and Topology on the Kinesin-Driven Motility of Microtubule Shuttles. ACS APPLIED BIO MATERIALS 2020; 3:7908-7918. [DOI: 10.1021/acsabm.0c01035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Haneen Martinez
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | | | - Jimin Guo
- Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Victoria R. Lujan
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jessica Depoy
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | | | - C. Jeffrey Brinker
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
- Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - George D. Bachand
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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3
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Self-Assembled Monolayers for Dental Implants. Int J Dent 2018; 2018:4395460. [PMID: 29552036 PMCID: PMC5818935 DOI: 10.1155/2018/4395460] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 10/26/2017] [Indexed: 02/06/2023] Open
Abstract
Implant-based therapy is a mature approach to recover the health conditions of patients affected by edentulism. Thousands of dental implants are placed each year since their introduction in the 80s. However, implantology faces challenges that require more research strategies such as new support therapies for a world population with a continuous increase of life expectancy, to control periodontal status and new bioactive surfaces for implants. The present review is focused on self-assembled monolayers (SAMs) for dental implant materials as a nanoscale-processing approach to modify titanium surfaces. SAMs represent an easy, accurate, and precise approach to modify surface properties. These are stable, well-defined, and well-organized organic structures that allow to control the chemical properties of the interface at the molecular scale. The ability to control the composition and properties of SAMs precisely through synthesis (i.e., the synthetic chemistry of organic compounds with a wide range of functional groups is well established and in general very simple, being commercially available), combined with the simple methods to pattern their functional groups on complex geometry appliances, makes them a good system for fundamental studies regarding the interaction between surfaces, proteins, and cells, as well as to engineering surfaces in order to develop new biomaterials.
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4
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Guo L, Fan Y, Kawazoe N, Fan H, Zhang X, Chen G. Fabrication of gelatin-micropatterned surface and its effect on osteogenic differentiation of hMSCs. J Mater Chem B 2018; 6:1018-1025. [DOI: 10.1039/c7tb03165c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Micropatterned surface with different surface chemistries was fabricated for the direct comparison of their effect on the behaviors of hMSCs and to avoid any batch to batch variations during cell culture.
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Affiliation(s)
- Likun Guo
- National Engineering Research Center for Biomaterials
- Sichuan University
- Chengdu
- China
- Research Center for Functional Materials
| | - Yujiang Fan
- National Engineering Research Center for Biomaterials
- Sichuan University
- Chengdu
- China
| | - Naoki Kawazoe
- Research Center for Functional Materials
- National Institute for Materials Science
- Tsukuba
- Japan
| | - Hongsong Fan
- National Engineering Research Center for Biomaterials
- Sichuan University
- Chengdu
- China
| | - Xingdong Zhang
- National Engineering Research Center for Biomaterials
- Sichuan University
- Chengdu
- China
| | - Guoping Chen
- Research Center for Functional Materials
- National Institute for Materials Science
- Tsukuba
- Japan
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5
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Yu TT, Cui FZ, Meng QY, Wang J, Wu DC, Zhang J, Kou XX, Yang RL, Liu Y, Zhang YS, Yang F, Zhou YH. Influence of Surface Chemistry on Adhesion and Osteo/Odontogenic Differentiation of Dental Pulp Stem Cells. ACS Biomater Sci Eng 2017; 3:1119-1128. [PMID: 33429586 DOI: 10.1021/acsbiomaterials.7b00274] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ting-Ting Yu
- Center
for Craniofacial Stem Cell Research and Regeneration, Department of
Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, P. R. China
| | - Fu-Zhai Cui
- School
of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - Qing-Yuan Meng
- School
of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - Juan Wang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics & Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - De-Cheng Wu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics & Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jin Zhang
- Division
of Engineering in Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
| | - Xiao-Xing Kou
- Center
for Craniofacial Stem Cell Research and Regeneration, Department of
Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, P. R. China
| | - Rui-Li Yang
- Center
for Craniofacial Stem Cell Research and Regeneration, Department of
Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, P. R. China
| | - Yan Liu
- Center
for Craniofacial Stem Cell Research and Regeneration, Department of
Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, P. R. China
| | - Yu Shrike Zhang
- Division
of Engineering in Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
| | - Fei Yang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics & Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yan-Heng Zhou
- Center
for Craniofacial Stem Cell Research and Regeneration, Department of
Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, P. R. China
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6
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Su WT, Pan YJ, Huang TY, Huang YC. Hydrophobic PDMS promotes neural progenitor formation from SHEDs by Schwann cell–cultivated medium induction. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2017.1297937] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Wen-Ta Su
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
| | - Yu-Jing Pan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
| | - Te-Yang Huang
- Department of Orthopedic Surgery, Mackay Memorial Hospital, Taipei, Taiwan
| | - Yu-Ching Huang
- Department of Orthopedic Surgery, Mackay Memorial Hospital, Taipei, Taiwan
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7
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Mörke C, Rebl H, Finke B, Dubs M, Nestler P, Airoudj A, Roucoules V, Schnabelrauch M, Körtge A, Anselme K, Helm CA, Nebe JB. Abrogated Cell Contact Guidance on Amino-Functionalized Microgrooves. ACS APPLIED MATERIALS & INTERFACES 2017; 9:10461-10471. [PMID: 28296389 DOI: 10.1021/acsami.6b16430] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Topographical and chemical features of biomaterial surfaces affect the cell physiology at the interface and are promising tools for the improvement of implants. The dominance of the surface topography on cell behavior is often accentuated. Striated surfaces induce an alignment of cells and their intracellular adhesion-mediated components. Recently, it could be demonstrated that a chemical modification via plasma polymerized allylamine was not only able to boost osteoblast cell adhesion and spreading but also override the cell alignment on stochastically machined titanium. In order to discern what kind of chemical surface modifications let the cell forget the underlying surface structure, we used an approach on geometric microgrooves produced by deep reactive ion etching (DRIE). In this study, we systematically investigated the surface modification by (i) methyl-, carboxyl-, and amino functionalization created via plasma polymerization processes, (ii) coating with the extracellular matrix protein collagen-I or immobilization of the integrin adhesion peptide sequence Arg-Gly-Asp (RGD), and (iii) treatment with an atmospheric pressure plasma jet operating with argon/oxygen gas (Ar/O2). Interestingly, only the amino functionalization, which presented positive charges at the surface, was able to chemically disguise the microgrooves and therefore to interrupt the microtopography induced contact guidance of the osteoblastic cells MG-63. However, the RGD peptide coating revealed enhanced cell spreading as well, with fine, actin-containing protrusions. The Ar/O2-functionalization demonstrated the best topography handling, e.g. cells closely attached even to features such as the sidewalls of the groove steps. In the end, the amino functionalization is unique in abrogating the cell contact guidance.
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Affiliation(s)
- Caroline Mörke
- Department of Cell Biology, University Medical Center Rostock , Schillingallee 69, 18057 Rostock, Germany
| | - Henrike Rebl
- Department of Cell Biology, University Medical Center Rostock , Schillingallee 69, 18057 Rostock, Germany
| | - Birgit Finke
- Leibniz-Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Strasse 2, 17489 Greifswald, Germany
| | - Manuela Dubs
- Biomaterials Department, INNOVENT e. V. , Pruessingstrasse 27B, 07745 Jena, Germany
| | - Peter Nestler
- Institute of Physics, University of Greifswald, Felix-Hausdorff-Strasse 6, 17487 Greifswald, Germany
| | - Aissam Airoudj
- Institute of Materials Sciences of Mulhouse (IS2M), CNRS UMR7361, 15 rue jean starcky, BP2488, 68057 Mulhouse cedex, France
| | - Vincent Roucoules
- Institute of Materials Sciences of Mulhouse (IS2M), CNRS UMR7361, 15 rue jean starcky, BP2488, 68057 Mulhouse cedex, France
| | | | - Andreas Körtge
- Institute of Electronic Appliances and Circuits, University of Rostock , Albert-Einstein-Strasse 2, 18059 Rostock, Germany
| | - Karine Anselme
- Institute of Materials Sciences of Mulhouse (IS2M), CNRS UMR7361, 15 rue jean starcky, BP2488, 68057 Mulhouse cedex, France
| | - Christiane A Helm
- Institute of Physics, University of Greifswald, Felix-Hausdorff-Strasse 6, 17487 Greifswald, Germany
| | - J Barbara Nebe
- Department of Cell Biology, University Medical Center Rostock , Schillingallee 69, 18057 Rostock, Germany
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8
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Caravaca C, Shi L, Balvay S, Rivory P, Laurenceau E, Chevolot Y, Hartmann D, Gremillard L, Chevalier J. Direct silanization of zirconia for increased biointegration. Acta Biomater 2016; 46:323-335. [PMID: 27686041 DOI: 10.1016/j.actbio.2016.09.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 09/22/2016] [Accepted: 09/24/2016] [Indexed: 11/17/2022]
Abstract
High-performance bioinert ceramics such as zirconia have been used for biomedical devices since the early seventies. In order to promote osseointegration, the historical solution has been to increase the specific surface of the implant through roughness. Nevertheless these treatments on ceramics may create defects at the surface, exposing the material to higher chances of early failure. In zirconia, such treatments may also affect the stability of the surface. More recently, the interest of improving osseointegration of implants has moved the research focus towards the actual chemistry of the surface. Inspired by this, we have adapted the current knowledge and techniques of silica functionalization and applied it to successfully introduce 3-aminopropyldimethylethoxy silane (APDMES) directly on the surface of zirconia (3Y-TZP). We used plasma of oxygen to clean the surface and promote hydroxylation of the surface to increase silane density. The samples were extensively characterized by means of X-ray photoelectron spectroscopy (XPS) and contact angle, mechanically tested and its cytotoxicity was evaluated through cell adhesion and proliferation tests. Additionally, aging was studied to discard negative effects of the treatment on the stability of the tetragonal phase. No adverse effect was found on the mechanical response of treated samples. In addition, plasma-treated samples exhibited an unexpectedly higher resistance to aging. Finally, silane density was 35% lower than the one reported in literature for silica. However cells displayed a qualitatively higher spreading in opposition to the rounder appearance of cells on untreated zirconia. These results lay the foundations for the next generation of zirconia implants with biologically friendlier surfaces. STATEMENT OF SIGNIFICANCE The use of zirconia-based ceramics in biomedical devices is broad and well accepted, especially in dental implants. However, they do not bond naturally to bone, therefore to ensure fixation surgeons typically rely on roughness at different scales, or on cements. Alternatively in this work we present a new perspective of surface modification through chemistry to enhance the interaction between surface and biological environment, without the downsides of roughness. This surface treatment is proposed for zirconia, which allowed a direct silanization of its surface and a higher cell attachment. The results of this research may open the possibility for the next generation of bioinert ceramic implants with more advanced tailored surfaces for increased osseointegration.
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Affiliation(s)
- Carlos Caravaca
- Université de Lyon, INSA de Lyon, Université Claude Bernard Lyon 1 - UMR CNRS 5510 MATEIS, 7, Avenue Jean Capelle, 69621 Villeurbanne cedex, France.
| | - Liu Shi
- Université de Lyon, École Centrale de Lyon, Institut des Nanotechnologies de Lyon (INL) - UMR CNRS 5270, 36 Avenue Guy de Collongue, 69134 Écully cedex, France
| | - Sandra Balvay
- Université de Lyon, INSA de Lyon, Université Claude Bernard Lyon 1 - UMR CNRS 5510 MATEIS, 7, Avenue Jean Capelle, 69621 Villeurbanne cedex, France
| | - Pascaline Rivory
- Université de Lyon, INSA de Lyon, Université Claude Bernard Lyon 1 - UMR CNRS 5510 MATEIS, 7, Avenue Jean Capelle, 69621 Villeurbanne cedex, France
| | - Emmanuelle Laurenceau
- Université de Lyon, École Centrale de Lyon, Institut des Nanotechnologies de Lyon (INL) - UMR CNRS 5270, 36 Avenue Guy de Collongue, 69134 Écully cedex, France
| | - Yann Chevolot
- Université de Lyon, École Centrale de Lyon, Institut des Nanotechnologies de Lyon (INL) - UMR CNRS 5270, 36 Avenue Guy de Collongue, 69134 Écully cedex, France
| | - Daniel Hartmann
- Université de Lyon, INSA de Lyon, Université Claude Bernard Lyon 1 - UMR CNRS 5510 MATEIS, 7, Avenue Jean Capelle, 69621 Villeurbanne cedex, France
| | - Laurent Gremillard
- Université de Lyon, INSA de Lyon, Université Claude Bernard Lyon 1 - UMR CNRS 5510 MATEIS, 7, Avenue Jean Capelle, 69621 Villeurbanne cedex, France
| | - Jérôme Chevalier
- Université de Lyon, INSA de Lyon, Université Claude Bernard Lyon 1 - UMR CNRS 5510 MATEIS, 7, Avenue Jean Capelle, 69621 Villeurbanne cedex, France
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9
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Zhang Y, Cui L, Li F, Shi N, Li C, Yu X, Chen Y, Kong W. Design, fabrication and biomedical applications of zein-based nano/micro-carrier systems. Int J Pharm 2016; 513:191-210. [DOI: 10.1016/j.ijpharm.2016.09.023] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 09/05/2016] [Accepted: 09/07/2016] [Indexed: 12/13/2022]
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10
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Almeida B, Shukla A. Degradation of alkanethiol self-assembled monolayers in mesenchymal stem cell culture. J Biomed Mater Res A 2016; 105:464-474. [DOI: 10.1002/jbm.a.35922] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 09/16/2016] [Accepted: 09/29/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Bethany Almeida
- School of Engineering, Center for Biomedical Engineering; Institute for Molecular and Nanoscale Innovation, Brown University; Providence Rhode Island
| | - Anita Shukla
- School of Engineering, Center for Biomedical Engineering; Institute for Molecular and Nanoscale Innovation, Brown University; Providence Rhode Island
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11
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VanDersarl JJ, Renaud P. Biomimetic surface patterning for long-term transmembrane access. Sci Rep 2016; 6:32485. [PMID: 27577519 PMCID: PMC5006161 DOI: 10.1038/srep32485] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 08/08/2016] [Indexed: 01/27/2023] Open
Abstract
Here we present a planar patch clamp chip based on biomimetic cell membrane fusion. This architecture uses nanometer length-scale surface patterning to replicate the structure and function of membrane proteins, creating a gigaohm seal between the cell and a planar electrode array. The seal is generated passively during cell spreading, without the application of a vacuum to the cell surface. This interface can enable cell-attached and whole-cell recordings that are stable to 72 hours, and generates no visible damage to the cell. The electrodes can be very small (<5 μm) and closely packed, offering a high density platform for cellular measurement.
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Affiliation(s)
- Jules J VanDersarl
- Microsystems Laboratory, EPFL-STI-IMT-LMIS4, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Philippe Renaud
- Microsystems Laboratory, EPFL-STI-IMT-LMIS4, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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12
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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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13
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Zheng Y, Xiong C, Wang Z, Zhang L. Enhanced osteoblast cells adhesion, spreading, and proliferation to surface-carboxylated poly(etheretherketone). J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515572494] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Poly(etheretherketone) is a rigid semicrystalline thermoplastic that combines excellent mechanical properties, broad chemical resistance, and bone-like stiffness, and is widely used in biomedical fields. However, the hydrophobic bio-inert surface of poly(etheretherketone) tends to hinder its biomedical applications when direct osteointegration between the implants and the host tissue is desired. In this investigation, poly(etheretherketone) surface was functionalized by a method with chemistry analogous to the formation of organosilane self-assembled monolayers on glass or silicon. First, poly(etheretherketone) surface activation with selective carbonyl reduction introduces surface hydroxylation. And then treatment of the hydroxylation-pretreated poly(etheretherketone) samples with a substituted organosilane solution forms the carboxyl (–COOH) functional surface layers. The modified surfaces were characterized using X-ray photoelectron spectroscopy, water contact angle measurements, differential scanning calorimetry, X-ray diffraction, and surface profiler. The effect of cell adhesion, spreading, and proliferation on each specimen was investigated. Pre-osteoblast cells (MC3T3-E1) adhesion, spreading, and proliferation were improved remarkably on surface-carboxylated poly(etheretherketone). Poly(etheretherketone) modified with –COOH on its surface has potential use in orthopedic or dental implants.
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Affiliation(s)
- Yanyan Zheng
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, People’s Republic of China
| | - Chengdong Xiong
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, People’s Republic of China
| | - Zhecun Wang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, People’s Republic of China
| | - Lifang Zhang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, People’s Republic of China
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14
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Lee C, Horiike M, Masutani K, Kimura Y. Characteristic cell adhesion behaviors on various derivatives of poly(3-hydroxybutyrate) (PHB) and a block copolymer of poly(3-[RS]-hydroxybutyrate) and poly(oxyethylene). Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2014.11.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Micrometer and Nanometer Scale Photopatterning of Proteins on Glass Surfaces by Photo-degradation of Films Formed from Oligo(Ethylene Glycol) Terminated Silanes. Biointerphases 2012; 7:54. [DOI: 10.1007/s13758-012-0054-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 08/10/2012] [Indexed: 11/25/2022] Open
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16
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Abstract
Biointegration refers to the interconnection between a biomedical device and the recipient tissue. In many implant devices, the lack of proper biointegration can cause device failure and potentially serious medical problems. This review summarizes the recent progress in surface chemistry, drug delivery and antifouling methods to improve the biointegration of implants. Much progress has been made as our understanding of biological systems and material properties expands and as new technologies become available. This article addresses methods of enhancing biointegration by means of modifying implant surface chemistry and by drug-delivery approaches.
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17
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Kavlock KD, Whang K, Guelcher SA, Goldstein AS. Degradable segmented polyurethane elastomers for bone tissue engineering: effect of polycaprolactone content. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 24:77-93. [PMID: 22304961 DOI: 10.1163/156856212x624985] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Segmented polyurethanes (PURs), consisting of degradable poly(a-hydroxy ester) soft segments and aminoacid-derived chain extenders, are biocompatible elastomers with tunable mechanical and degradative properties suitable for a variety of tissue-engineering applications. In this study, a family of linear PURs synthesized from poly(ϵ-caprolactone) (PCL) diol, 1,4-diisocyanobutane and tyramine with theoretical PCL contents of 65-80 wt% were processed into porous foam scaffolds and evaluated for their ability to support osteoblastic differentiation in vitro. Differential scanning calorimetry and mechanical testing of the foams indicated increasing polymer crystallinity and compressive modulus with increasing PCL content. Next, bone marrow stromal cells (BMSCs) were seeded into PUR scaffolds, as well as poly(lactic-co-glycolic acid) (PLGA) scaffolds, and maintained under osteogenic conditions for 14 and 21 days. Analysis of cell number indicated a systematic decrease in cell density with increasing PUR stiffness at both 14 and 21 days in culture. However, at these same time points the relative mRNA expression for the bone-specific proteins osteocalcin and the growth factors bone morphogenetic protein-2 and vascular endothelial growth factor gene expression were similar among the PURs. Finally, prostaglandin E2 production, alkaline phosphatase activity and osteopontin mRNA expression were highly elevated on the most-crystalline PUR scaffold as compared to the PLGA and PUR scaffolds. These results suggest that both the modulus and crystallinity of the PUR scaffolds influence cell proliferation and the expression of osteoblastic proteins.
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Affiliation(s)
- Katherine D Kavlock
- School of Biomedical Engineering and Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0211, USA
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18
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Hudalla GA, Murphy WL. Chemically well-defined self-assembled monolayers for cell culture: toward mimicking the natural ECM. SOFT MATTER 2011; 7:9561-9571. [PMID: 25214878 PMCID: PMC4159093 DOI: 10.1039/c1sm05596h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The extracellular matrix (ECM) is a network of biological macromolecules that surrounds cells within tissues. In addition to serving as a physical support, the ECM actively influences cell behavior by providing sites for cell adhesion, establishing soluble factor gradients, and forming interfaces between different cell types within a tissue. Thus, elucidating the influence of ECM-derived biomolecules on cell behavior is an important aspect of cell biology. Self-assembled monolayers (SAMs) have emerged as promising tools to mimic the ECM as they provide chemically well-defined substrates that can be precisely tailored for specific cell culture applications, and their application in this regard is the focus of this review. In particular, this review will describe various approaches to prepare SAM-based culture substrates via non-specific adsorption, covalent immobilization, or non-covalent sequestering of ECM-derived biomolecules. Additionally, this review will highlight SAMs that present ECM-derived biomolecules to cells to probe the role of these molecules in cell-ECM interactions, including cell attachment, spreading and 'outside-in' signaling via focal adhesion complex formation. Finally, this review will introduce SAMs that can present or sequester soluble signaling molecules, such as growth factors, to study the influence of localized soluble factor activity on cell behavior. Together, these examples demonstrate that the chemical specificity and variability afforded by SAMs can provide robust, well-defined substrates for cell culture that can simplify experimental design and analysis by eliminating many of the confounding factors associated with traditional culture substrates.
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Affiliation(s)
- Gregory A. Hudalla
- Department of Biomedical Engineering, University of Wisconsin, 5009 Wisconsin Institutes of Medical Research, 1111 Highland Ave., Madison, WI, 53705, USA
| | - William L. Murphy
- Department of Biomedical Engineering, University of Wisconsin, 5009 Wisconsin Institutes of Medical Research, 1111 Highland Ave., Madison, WI, 53705, USA
- Department of Pharmacology, University of Wisconsin, 5009 Wisconsin Institutes of Medical Research, 1111 Highland Ave., Madison, WI, 53705, USA
- Department of Orthopedics and Rehabilitation, University of Wisconsin, 5009 Wisconsin Institutes of Medical Research, 1111 Highland Ave., Madison, WI, 53705, USA
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19
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Giljean S, Ponche A, Bigerelle M, Anselme K. Statistical approach of chemistry and topography effect on human osteoblast adhesion. J Biomed Mater Res A 2010; 94:1111-23. [PMID: 20694978 DOI: 10.1002/jbm.a.32793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Our objective in this work was to determine statistically the relative influence of surface topography and surface chemistry of metallic substrates on long-term adhesion of human bone cell quantified by the adhesion power (AP). Pure titanium, titanium alloy, and stainless steel substrates were processed with electro-erosion, sandblasting, or polishing giving various morphologies and amplitudes. The surface chemistry was characterized by X-ray photoelectron spectroscopy (XPS) associated with an extensive analysis of surface topography. The statistical analysis demonstrated that the effect on AP of the material composition was not significant. More, no correlation was found between AP and the surface element concentrations determined by XPS demonstrating that the surface chemistry was not an influencing parameter for long-term adhesion. In the same way, the roughness amplitude, independently of the process, had no influence on AP, meaning that roughness amplitude is not an intrinsic parameter of long-term adhesion. On the contrary, the elaboration process alone had a significant effect on AP. For a same surface elaboration process, the number of inflexion points, or G parameter, was the most pertinent roughness parameter for describing the topography influence on long-term adhesion. Thus, more the inflexion points, more the discontinuities, higher the long-term adhesion.
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Affiliation(s)
- S Giljean
- Institut de Science des Matériaux de Mulhouse (IS2M), CNRS LRC7228, Université de Haute-Alsace, Mulhouse, France
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20
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A comparative investigation of methods for protein immobilization on self-assembled monolayers using glutaraldehyde, carbodiimide, and anhydride reagents. Biointerphases 2010; 3:59-65. [PMID: 20408701 DOI: 10.1116/1.2976451] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Three different approaches to the immobilization of proteins at surfaces have been compared. All rely on the creation of surface groups that bind primary amines on lysine residues. Carboxylic acid terminated self-assembled monolayers (SAMs) have been activated using a water soluble carbodiimide to yield an active ester functionalized surface and with trifluoroacetic anhydride to yield a surface anhydride, and amine terminated SAMs have been activated using glutaraldehyde. Although the degree of surface derivatization by n-alkylamines was greater using the carbodiimide and anhydride methods under anhydrous conditions, the glutaraldehyde activation of amine terminated SAMs yielded significantly greater attachment of streptavidin than is achieved using either of the other methods. This is attributed to the susceptibility to hydrolysis of the active species formed by activation of the carboxylic acid terminated monolayers. Patterned protein structures may be formed by using both glutaraldehyde activation of amine terminated thiols and carbodiimide activation of carboxylic acid terminated thiols, in conjunction with selective photo-oxidation of oligo(ethylene glycol) terminated SAMs.
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Materials Surface Effects on Biological Interactions. ADVANCES IN REGENERATIVE MEDICINE: ROLE OF NANOTECHNOLOGY, AND ENGINEERING PRINCIPLES 2010. [DOI: 10.1007/978-90-481-8790-4_12] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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22
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Phillips JE, Petrie TA, Creighton FP, García AJ. Human mesenchymal stem cell differentiation on self-assembled monolayers presenting different surface chemistries. Acta Biomater 2010; 6:12-20. [PMID: 19632360 DOI: 10.1016/j.actbio.2009.07.023] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2009] [Revised: 06/26/2009] [Accepted: 07/20/2009] [Indexed: 12/14/2022]
Abstract
Human mesenchymal stem cells (hMSCs) have tremendous potential as a cell source for regenerative medicine due to their capacity for differentiation into a wide range of connective tissue cell types. Although significant progress has been made in the identification of defined growth factor conditions to induce lineage commitment, the effect of underlying biomaterial properties on functional differentiation is far less understood. Here we conduct a systematic assessment of the role for surface chemistry on cell growth, morphology, gene expression and function during hMSC commitment along osteogenic, chondrogenic and adipogenic lineages. Using self-assembled monolayers of omega-functionalized alkanethiols on gold as model substrates, we demonstrate that biomaterial surface chemistry differentially modulates hMSC differentiation in a lineage-dependent manner. These results highlight the importance of initial biomaterial surface chemistry on long-term functional differentiation of adult stem cells, and suggest that surface properties are a critical parameter that must be considered in the design of biomaterials for stem cell-based regenerative medicine strategies.
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Affiliation(s)
- Jennifer E Phillips
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA
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23
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Investigation of the spreading and adhesion of human osteosarcoma cells on smooth and micro-grooved polydimethylsiloxane surfaces. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.05.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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24
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Guo L, Kawazoe N, Hoshiba T, Tateishi T, Chen G, Zhang X. Osteogenic differentiation of human mesenchymal stem cells on chargeable polymer-modified surfaces. J Biomed Mater Res A 2008; 87:903-12. [DOI: 10.1002/jbm.a.31834] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Abstract
At present, strong requirements in orthopaedics are still to be met, both in bone and joint substitution and in the repair and regeneration of bone defects. In this framework, tremendous advances in the biomaterials field have been made in the last 50 years where materials intended for biomedical purposes have evolved through three different generations, namely first generation (bioinert materials), second generation (bioactive and biodegradable materials) and third generation (materials designed to stimulate specific responses at the molecular level). In this review, the evolution of different metals, ceramics and polymers most commonly used in orthopaedic applications is discussed, as well as the different approaches used to fulfil the challenges faced by this medical field.
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Affiliation(s)
- M Navarro
- Biomaterials, Implants and Tissue Engineering, Institute for Bioengineering of Catalonia (IBEC), CIBER-BBN, 08028 Barcelona, Spain.
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26
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Jones JA, Qin LA, Meyerson H, Kwon IK, Matsuda T, Anderson JM. Instability of self-assembled monolayers as a model material system for macrophage/FBGC cellular behavior. J Biomed Mater Res A 2008; 86:261-8. [PMID: 18412136 DOI: 10.1002/jbm.a.31660] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Novel self-assembled monolayers (SAMs) designed to present homogenous surface chemistries were utilized to further investigate the material surface chemistry dependent macrophage and foreign-body giant cell (FBGC) behaviors, including macrophage adhesion, fusion, and apoptosis. Contact angle analysis revealed instabilities in the --CH(3) and --COOH terminated SAM surfaces upon incubation in serum-free media (SFM) at 37 degrees C or under dry, room temperature conditions. Further analysis indicated that the --CH(3) terminated SAM surface degraded rapidly within 2 h and loss of sufficient SAM units to be comparable to the gold (Au) control surface, within 24 h of incubation in SFM at 37 degrees C. After 5 days of incubation in SFM at 37 degrees C, the contact angles for the --COOH terminated SAM surfaces increased markedly. AFM analysis confirmed the desorption of --CH(3) terminated SAM molecules from the surface with increased roughness and marked appearance of peaks and valleys within 2 h. A decrease in the thickness of the --COOH terminated SAM surface also suggests molecular desorption over time. No significant changes in contact angle or AFM analyses were observed on the --OH terminated SAM surfaces. Cellular adhesion decreased more rapidly on the Au control and --CH(3) terminated SAM surfaces in comparison to the other surfaces. However by day 10, cellular adhesion, fusion, and apoptosis were comparable on all SAM surfaces and the Au control. These studies suggest that SAM surfaces may not be suitable for long-term studies where material dependent properties are investigated.
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Affiliation(s)
- Jacqueline A Jones
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Wang Q, Xian W, Li S, Liu C, Padua GW. Topography and biocompatibility of patterned hydrophobic/hydrophilic zein layers. Acta Biomater 2008; 4:844-51. [PMID: 18325861 DOI: 10.1016/j.actbio.2008.01.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2007] [Revised: 01/08/2008] [Accepted: 01/15/2008] [Indexed: 11/19/2022]
Abstract
The topography and biocompatibility of zein layers adsorbed on patterned templates containing hydrophilic and hydrophobic regions were investigated. Nanopatterned templates consisting of hydrophilic lines on a hydrophobic background were drawn by dip-pen nanolithography (DPN) on gold-coated surfaces. 16-Mercaptohexadecanoic acid (COOH(CH(2))(15)SH, MHA) was used as primary ink to generate hydrophilic lines. Unpatterned surfaces were backfilled with 18-octadecanethiol (CH(3)(CH(2))(17)SH, ODT), which generated hydrophobic regions. Zein was allowed to adsorb on patterned surfaces from alcohol-water solutions. The topography of zein deposits was observed by atomic force microscopy (AFM). Height profiles from AFM measurements revealed that zein deposits followed closely the nanopatterned templates. The biocompatibility of zein layers assembled over hydrophilic/hydrophobic micropatterned templates was investigated. Templates containing MHA lines and ODT regions were generated by micro-contact printing (microCP). Mouse fibroblasts seeded on patterned zein layers proliferated on zein deposited over MHA lines, but not on zein over ODT. The experiment indicated that fibroblast cells were able to respond to variations in the underlying surface chemistry, transmitted by the different orientation adopted by zein on the different substrates. This property may be useful in controlling the spatial distribution of cells on patterned protein layers.
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Affiliation(s)
- Qin Wang
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, 382/D AESB, Urbana, IL 61801, USA.
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28
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Lim JY, Shaughnessy MC, Zhou Z, Noh H, Vogler EA, Donahue HJ. Surface energy effects on osteoblast spatial growth and mineralization. Biomaterials 2008; 29:1776-84. [PMID: 18222536 DOI: 10.1016/j.biomaterials.2007.12.026] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2007] [Accepted: 12/20/2007] [Indexed: 01/03/2023]
Abstract
While short-term surface energy effects on cell adhesion are relatively well known, little is revealed as regards its later stage effects on cell behavior. We examined surface energy effects on osteoblastic cell growth and mineralization by using human fetal osteoblastic (hFOB) cells cultured on plasma-treated quartz (contact angle, theta=0 degrees) and octadecyltrichlorosilane (OTS)-treated quartz (theta=113 degrees). hFOB cells formed a homogeneous cell layer on plasma-treated quartz, while those cultured on OTS-treated quartz produced randomly distributed clump-like structures that were filled with cells (confirmed by confocal microscopy). Mineral deposition by hFOB cells was spatially homogeneous when cultured on hydrophilic surfaces. Furthermore, cells on hydrophilic surfaces exhibited increased mineralized area as well as enhanced mineral-to-matrix ratio (assessed by Fourier transform infrared spectroscopy), relative to cells on hydrophobic surfaces. Experiments using other types of osteoblast-like cells (MC3T3-E1, MG63, and SAOS-2) revealed more or less similar effects in spatial growth morphology. It was concluded that hydrophilic surfaces induce homogeneous spatial osteoblastic cell growth and mineral deposition and enhance the quantity (e.g., area) and quality (e.g., mineral-to-matrix ratio) of mineralization relative to hydrophobic surfaces. Our data suggest that surface energy effects on osteoblastic cell differentiation, especially mineralization, may be correlated with surface energy dependent changes in spatial cell growth.
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Affiliation(s)
- Jung Yul Lim
- Division of Musculoskeletal Sciences, Department of Orthopaedics and Rehabilitation, Center for Biomedical Devices and Functional Tissue Engineering, College of Medicine, Pennsylvania State University, Hershey, PA 17033, USA
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29
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Guo L, Kawazoe N, Fan Y, Ito Y, Tanaka J, Tateishi T, Zhang X, Chen G. Chondrogenic differentiation of human mesenchymal stem cells on photoreactive polymer-modified surfaces. Biomaterials 2008; 29:23-32. [DOI: 10.1016/j.biomaterials.2007.08.043] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Accepted: 08/27/2007] [Indexed: 11/29/2022]
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30
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Kavlock KD, Pechar TW, Hollinger JO, Guelcher SA, Goldstein AS. Synthesis and characterization of segmented poly(esterurethane urea) elastomers for bone tissue engineering. Acta Biomater 2007; 3:475-84. [PMID: 17418651 PMCID: PMC2034277 DOI: 10.1016/j.actbio.2007.02.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2006] [Revised: 02/01/2007] [Accepted: 02/02/2007] [Indexed: 01/12/2023]
Abstract
Segmented polyurethanes have been used extensively in implantable medical devices, but their tunable mechanical properties make them attractive for examining the effect of biomaterial modulus on engineered musculoskeletal tissue development. In this study, a family of segmented degradable poly(esterurethane urea)s (PEUURs) were synthesized from 1,4-diisocyanatobutane, a poly(epsilon-caprolactone) (PCL) macrodiol soft segment and a tyramine-1,4-diisocyanatobutane-tyramine chain extender. By systematically increasing the PCL macrodiol molecular weight from 1100 to 2700Da, the storage modulus, crystallinity and melting point of the PCL segment were systematically varied. In particular, the melting temperature, T(m), increased from 21 to 61 degrees C and the storage modulus at 37 degrees C increased from 52 to 278MPa with increasing PCL macrodiol molecular weight, suggesting that the crystallinity of the PCL macrodiol contributed significantly to the mechanical properties of the polymers. Bone marrow stromal cells were cultured on rigid polymer films under osteogenic conditions for up to 21 days. Cell density, alkaline phosphatase activity, and osteopontin and osteocalcin expression were similar among PEUURs and comparable to poly(d,l-lactic-coglycolic acid). This study demonstrates the suitability of this family of PEUURs for tissue engineering applications, and establishes a foundation for determining the effect of biomaterial modulus on bone tissue development.
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Affiliation(s)
- Katherine D. Kavlock
- School of Biomedical Engineering and Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0211, USA
| | - Todd W. Pechar
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0211, USA
| | - Jeffrey O. Hollinger
- Bone Tissue Engineering Center, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Scott A. Guelcher
- Department of Chemical Engineering, Vanderbilt University, Nashville, TN 37235, USA
| | - Aaron S. Goldstein
- School of Biomedical Engineering and Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0211, USA
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0211, USA
- *Corresponding author. Tel.: +1 540 231 3674; fax: +1 540 231 5022. E-mail address: (A.S. Goldstein)
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31
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Zou H, Mellon S, Syms RRA, Tanner KE. 2-Dimensional MEMS dielectrophoresis device for osteoblast cell stimulation. Biomed Microdevices 2007; 8:353-9. [PMID: 16917662 DOI: 10.1007/s10544-006-9818-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A fixed microelectrode device for cell stimulation has been designed and fabricated using micro-electro-mechanical systems (MEMS) technology. Dielectrophoretic forces obtained from non-uniform electric fields were used for manipulating and positioning osteoblasts. The experiments show that the osteoblasts experience positive dielectrophoresis (p-DEP) when suspended in iso-osmotic culture medium and exposed to AC fields at 5 MHz frequency. Negative dielectrophoresis (n-DEP) is obtained at 0.1 MHz. The viability of osteoblasts under dielectrophoresis has been investigated. The viability values for cells exposed to DEP are nearly three times higher than the control values, indicating that dielectrophoresis may have an anabolic effect on osteoblasts.
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Affiliation(s)
- H Zou
- Optical and Semiconductor Devices Group, EEE Dept., Imperial College, Exhibition Road, London, SW7 2AZ, UK.
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32
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Lee JRI, Willey TM, Nilsson J, Terminello LJ, De Yoreo JJ, van Buuren T. Effect of ring substitution position on the structural conformation of mercaptobenzoic acid self-assembled monolayers on Au(111). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:11134-41. [PMID: 17154594 DOI: 10.1021/la0611256] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, photoemission spectroscopy (PES), and contact angle measurements have been used to examine the structure and bonding of self-assembled monolayers (SAMs) prepared on Au(111) from the positional isomers of mercaptobenzoic acid (MBA). The isomer of MBA and solvent chosen in SAM preparation has considerable bearing upon film morphology. Carbon K-edge NEXAFS measurements indicate that the monomers of 2-, 3-, and 4-MBA have well-defined orientations within their respective SAMs. Monomers of 3- and 4-MBA assume an upright orientation on the Au substrates in monolayers prepared using an acetic acid in ethanol solvent. The aryl ring and carboxyl group of these molecules are tilted from the surface normal by a colatitudal angle of approximately 30 degrees . Preparation of 4-MBA SAMs using pure ethanol solvent, a more traditional means of synthesis, had no appreciable effect upon the monomer orientation. Nonetheless, S(2p) PES measurements illustrate that it results in extensive bilayer formation via carboxyl group hydrogen-bonding between 4-MBA monomers. In 2-MBA monolayers prepared using acetic acid/ethanol solvent, the monomers adopt a more prostrate orientation on the Au substrates, in which the aryl ring and carboxyl group of the molecules are tilted approximately 50 degrees from the surface normal. This configuration is consistent with an interaction between both the mercaptan sulfur and carboxyl group of 2-MBA with the underlying substrate. S(2p) and C(1s) PES experiments provide supporting evidence for a bidentate interaction between 2-MBA and Au(111).
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Affiliation(s)
- Jonathan R I Lee
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
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33
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de la Fuente JM, Andar A, Gadegaard N, Berry CC, Kingshott P, Riehle MO. Fluorescent aromatic platforms for cell patterning. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:5528-32. [PMID: 16768466 DOI: 10.1021/la053045s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
This paper describes a simple experimental method of patterning fluorescent organic dyes, fluorescein, and rhodamine on gold substrates by microcontact printing techniques. The development of this step-by-step protocol has allowed us to prepare striped and squared micropatterns with poly(ethylene glycol) (PEG) linkers terminated by these fluorophores using a fast, easy, and inexpensive technique. Although the rest of the surface was covered with aliphatic molecules (methyl terminated), human fibroblasts demonstrated an unexpected response, aligning themselves according to the aromatic patterns, despite the presence of PEG, which is a cell resistant molecule, in the fluorescent regions.
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Affiliation(s)
- Jesus M de la Fuente
- Centre for Cell Engineering, Institute of Biomedical and Life Science, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
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34
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Su WT, Liao YF, Chu IM. Observation of fibroblast motility on a micro-grooved hydrophobic elastomer substrate with different geometric characteristics. Micron 2006; 38:278-85. [PMID: 16765053 DOI: 10.1016/j.micron.2006.04.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2005] [Revised: 04/19/2006] [Accepted: 04/20/2006] [Indexed: 10/24/2022]
Abstract
We used a hydrophobic micro-textured poly-dimethylsiloxane (PDMS) in the presence of serum protein at 37 degrees C to study the motility of mouse stromal fibroblast on variant (15-100microm) parallel ridge/groove with 30microm depth. In this paper, we observed the temporal changes in cell morphology and locomotion by using time-lapse phase-contrast microscopy. When fibroblasts seeded onto the micro-grooved substrate, almost all of cells concentrated at the bottom of the grooves. Sequentially, the fibroblasts attached and spread on the surface, migrated toward the walls of the grooves, climbed up and down the ridges frequently, apparently, the 30microm depth of groove did not hinder movement across the micro-grooves. Eventually, they stopped proliferating as a result of contact inhibition and formed a confluent monolayer on the ridges almost exclusively, with an orientation parallel to the direction of the ridge/groove. Cellular shape of fibroblast was enhanced with the micro-grooves, the form index of nucleus was 2.6-fold greater than that of cells on smooth surfaces. Further, we found that hydrophobic surfaces are more prone to direct cellular motility in comparison with hydrophilic surfaces.
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Affiliation(s)
- Wen-Ta Su
- Department of Chemical Engineering, National Taipei University of Technology, Taipei 106, Taiwan.
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35
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Liu DP, Majewski P, O'Neill BK, Ngothai Y, Colby CB. The optimal SAM surface functional group for producing a biomimetic HA coating on Ti. J Biomed Mater Res A 2006; 77:763-72. [PMID: 16565961 DOI: 10.1002/jbm.a.30641] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Commercial interest is growing in biomimetic methods that employ self assembled mono-layers (SAMs) to produce biocompatible HA coatings on Ti-based orthopedic implants. Recently, separate studies have considered HA formation for various SAM surface functional groups. However, these have often neglected to verify crystallinity of the HA coating, which is essential for optimal bioactivity. Furthermore, differing experimental and analytical methods make performance comparisons difficult. This article investigates and evaluates HA formation for four of the most promising surface functional groups: --OH, --SO(3)H, --PO(4)H(2) and --COOH. All of them successfully formed a HA coating at Ca/P ratios between 1.49 and 1.62. However, only the --SO(3)H and --COOH end groups produced a predominantly crystalline HA. Furthermore, the --COOH end group yielded the thickest layer and possessed crystalline characteristics very similar to that of the human bone. The --COOH end group appears to provide the optimal SAM surface interface for nucleation and growth of biomimetic crystalline HA. Intriguingly, this finding may lend support to explanations elsewhere of why human bone sialoprotein is such a potent nucleator of HA and is attributed to the protein's glutamic acid-rich sequences.
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Affiliation(s)
- D P Liu
- Chemical Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia
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36
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Senaratne W, Andruzzi L, Ober CK. Self-assembled monolayers and polymer brushes in biotechnology: current applications and future perspectives. Biomacromolecules 2005; 6:2427-48. [PMID: 16153077 DOI: 10.1021/bm050180a] [Citation(s) in RCA: 483] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The chemistry and topography of a surface affect biological response and are of fundamental importance, especially when living systems encounter synthetic surfaces. Most biomolecules have immense recognition power (specific binding) and simultaneously have a tendency to physically adsorb onto a solid substrate without specific receptor recognition (nonspecific adsorption). Therefore, to create useful materials for many biotechnology applications, interfaces are required that have both enhanced specific binding and reduced nonspecific binding. Thus, in applications such as sensors, the tailoring of surface chemistry and the use of micro or nanofabrication techniques becomes an important avenue for the production of surfaces with specific binding properties and minimal background interference. Both self-assembled monolayers (SAMs) and polymer brushes have attracted considerable attention as surface-active materials. In this review, we discuss both of these materials with their potential applications in biotechnology. We also summarize lithographic methods for pattern formation using combined top-down and bottom-up approaches and briefly discuss the future of these materials by describing emerging new applications.
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Affiliation(s)
- Wageesha Senaratne
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
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37
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Fleith S, Ponche A, Bareille R, Amédée J, Nardin M. Effect of several sterilisation techniques on homogeneous self assembled monolayers. Colloids Surf B Biointerfaces 2005; 44:15-24. [PMID: 15982857 DOI: 10.1016/j.colsurfb.2005.05.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Revised: 05/18/2005] [Accepted: 05/25/2005] [Indexed: 12/01/2022]
Abstract
Understanding how cells sense their environment and are able to regulate their metabolism is of great importance for the success of biomaterials implantation. Self assembled monolayers (SAMs) are in use nowadays to model the surface of such materials. They permit the control of different surface parameters (like chemistry, surface energy and topography) enabling to get a greater insight in cells behaviour when interacting with surfaces and thus, in the future, to enhance surface properties of biomaterials. As sterilisation is the compulsory step for in vitro and in vivo assays with living biological materials, it is important to know how SAMs react under sterilisation techniques in use on biomaterials. In this work, the effect of three types of sterilisation techniques: gamma-irradiation, mostly used on biomaterials, dry heat and steam autoclaving, have been investigated on NH2 and CH3 terminated SAMs. Gamma-irradiation destructs drastically the NH2 and partially the CH3 monolayers by producing oxidative compounds (COOH, C=O, C-OH). The main product induced by gamma-irradiation on NH2 monolayers is carboxylic acid, whereas CH3 shows an important increase in the amount of alcoholic groups. This difference in deterioration is assumed to be due to the higher stability of the CH3 monolayer. Steam autoclaving to a lesser extent gives the same results on NH2 monolayers. Dry heat seems to be the most reliable technique, which can be used on such surfaces as it removes physically adsorbed organic contaminants without affecting the integrity of the surface.
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Affiliation(s)
- S Fleith
- Institut de Chimie des Surfaces et Interfaces (ICSI-CNRS-UPR 9069), BP 2488, 68057 Mulhouse Cedex, France
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38
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Hao L, Lawrence J, Chian KS. Osteoblast cell adhesion on a laser modified zirconia based bioceramic. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2005; 16:719-26. [PMID: 15965741 DOI: 10.1007/s10856-005-2608-3] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2004] [Accepted: 11/18/2004] [Indexed: 05/03/2023]
Abstract
Due to their attractive mechanical properties, bioinert zirconia bioceramics are frequently used in the high load-bearing sites such as orthopaedic and dental implants, but they are chemically inert and do not naturally form a direct bond with bone and thus do not provide osseointegration. A CO2 laser was used to modify the surface properties with the aim to achieve osseointegration between bioinert zirconia and bone. The surface characterisation revealed that the surface roughness decreased and solidified microstructure occurred after laser treatment. Higher wettability characteristics generated by the CO2 laser treatment was primarily due to the enhancement of the surface energy, particularly the polar component, determined by microstructural changes. An in vitro test using human fetal osteoblast cells (hFOB) revealed that osteoblast cells adhere better on the laser treated sample than the untreated sample. The change in the wettability characteristics could be the main mechanism governing the osteoblast cell adhesion on the YPSZ.
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Affiliation(s)
- L Hao
- Wolfson School of Mechanical and Manufacturing Engineering, Rapid Manufacturing Research Group, Loughborough University, LE11 3TU, UK.
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Badami AS, Kreke MR, Thompson MS, Riffle JS, Goldstein AS. Effect of fiber diameter on spreading, proliferation, and differentiation of osteoblastic cells on electrospun poly(lactic acid) substrates. Biomaterials 2005; 27:596-606. [PMID: 16023716 DOI: 10.1016/j.biomaterials.2005.05.084] [Citation(s) in RCA: 427] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2004] [Accepted: 05/17/2005] [Indexed: 11/30/2022]
Abstract
Electrospinning is a promising method to construct fused-fiber biomaterial scaffolds for tissue engineering applications, but the efficacy of this approach depends on how substrate topography affects cell function. Previously, it has been shown that linear, parallel raised features with length scales of 0.5-2 microm direct cell orientation through the phenomenon of contact guidance, and enhance phenotypic markers of osteoblastic differentiation. To determine how the linear, random raised features produced by electrospinning affect proliferation and differentiation of osteoprogenitor cells, poly(lactic acid) and poly(ethylene glycol)-poly(lactic acid) diblock copolymers were electrospun with mean fiber diameters of 0.14-2.1 microm onto rigid supports. MC3T3-E1 osteoprogenitor cells cultured on fiber surfaces in the absence of osteogenic factors exhibited a lower cell density after 7 and 14 days of culture than cells cultured on spin-coated surfaces, but cell density increased with fiber diameter. However, in the presence of osteogenic factors (2 mM beta-glycerophosphate, 0.13 mM L-ascorbate-2-phosphate), cell density after 7 and 14 days of culture on fiber surfaces was comparable to or exceeded spin-coated controls, and alkaline phosphatase activity after 14 days was comparable. Examination of cell morphology revealed that cells grown on fibers had smaller projected areas than those on planar surfaces. However, cells attached to electrospun substrates of 2.1 microm diameter fibers exhibited a higher cell aspect ratio than cells on smooth surfaces. These studies show that topographical factors designed into biomaterial scaffolds can regulate spreading, orientation, and proliferation of osteoblastic cells.
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Affiliation(s)
- Anand S Badami
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0211, USA
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Hao L, Lawrence J, Chian KS. Effects of CO2 laser irradiation on the surface properties of magnesia-partially stabilised zirconia (MgO-PSZ) bioceramic and the subsequent improvements in human osteoblast cell adhesion. J Biomater Appl 2005; 19:81-105. [PMID: 15381783 DOI: 10.1177/0885328204043546] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In order to acquire the surface properties favouring osseo-integration at the implant and bone interface, human foetal osteoblast cells (hFOB) were used in an in vitro test to examine changes in cell adhesion on a magnesia-partially stabilised zirconia (MgO-PSZ) bioceramic after CO(2) laser treatment. The surface roughness, microstructure, crystal size and surface energy of untreated and CO(2) laser-treated MgO-PSZ were fully characterised. The in vitro cell evaluation revealed a more favourable cell response on the CO(2) laser-treated MgO-PSZ than on the untreated sample. After 24-h cell incubation, no cell was observed on the MgO-PSZ, whereas a few cells attached on the CO(2) laser-treated MgO-PSZandshowedwellspreadandgood attachment. Moreover, the cell coverage density indicating cell proliferation generally increases with CO(2) laser power densities applied in the experiments. The enhancement of the surface energy of the MgO-PSZ, especially its polar component caused by the CO(2) laser treatment, was found to play a significant role in the initial cell attaching, thus enhancing the cell growth. Moreover, the change in topography induced by the CO(2) laser treatment was identified as one of the factors influencing the hFOB cell response.
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Affiliation(s)
- L Hao
- Manufacturing Engineering Division, School of Mechanical & Production Engineering, Nanyang Technological University (NTU), Nanyang Avenue, Singapore 639798.
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41
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Hao L, Lawrence J, Phua YF, Chian KS, Lim GC, Zheng HY. Enhanced human osteoblast cell adhesion and proliferation on 316 LS stainless steel by means of CO2 laser surface treatment. J Biomed Mater Res B Appl Biomater 2005; 73:148-56. [PMID: 15627247 DOI: 10.1002/jbm.b.30194] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
An effective and novel technique for improving the biocompatibility of a biograde 316 LS stainless steel through the application of CO(2) laser treatment to modify the surface properties of the material is described herein. Different surface properties, such as surface roughness, surface oxygen content, and surface energy for CO(2) laser-treated 316 LS stainless steel, untreated, and mechanically roughened samples were analyzed, and their effects on the wettability characteristics of the material were studied. It was found that modification of the wettability characteristics of the 316 LS stainless steel following CO(2) laser treatment was achieved. This improvement was identified as being mainly due to the change in the polar component of the surface energy. One-day cell adhesion tests showed that cells not only adhered and spread better, but also grew faster on the CO(2) laser-treated sample than on either the untreated or mechanically roughened sample. Further, compared with the untreated sample, MTT cell proliferation analysis revealed that the mechanically roughed surface resulted in a slight enhancement, and CO(2) laser treatment brought about a significant increase in cell proliferation. An increase in the wettability of the 316 LS stainless steel was observed to positively correlate with the cell proliferation.
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Affiliation(s)
- L Hao
- Manufacturing Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
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42
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El-Ghannam AR, Ducheyne P, Risbud M, Adams CS, Shapiro IM, Castner D, Golledge S, Composto RJ. Model surfaces engineered with nanoscale roughness and RGD tripeptides promote osteoblast activity. J Biomed Mater Res A 2004; 68:615-27. [PMID: 14986317 DOI: 10.1002/jbm.a.20051] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cell adhesion to biomaterials is a prerequisite for tissue integration with the implant surface. Herein, we show that we can generate a model silica surface that contains a minimal-length arginine-glycine-aspartic acid (RGD) peptide that maintains its biological activity. In the first part of this study, attachment of MC3T3-E1 osteoblast-like cells was investigated on silicon oxide, amine terminated substrates [i.e., 3-aminopropyl triethoxysilane (APTS)], grafted RGD, and physisorbed RGD control. The APTS layer exhibited nanoscale roughness and presented amine functional groups for grafting a minimal RGD tripeptide devoid of any flanking groups or spacers. Contact angle measurements indicated that the hydrophobicity of the APTS surface was significantly lower than that of the surface with grafted RGD (RGD-APTS). Atomic force microscopy showed that surfaces covered with RGD-APTS were smoother (Ra = 0.71 nm) than those covered with APTS alone (Ra = 1.59 nm). Focusing mainly on cell morphology, experiments showed that the RGD-APTS hybrid provided an optimum surface for cell adhesion, spreading, and cytoskeletal organization. Discrete focal adhesion plaques were also observed consistent with successful cell signaling events. In a second set of experiments, smooth, monolayers of APTS (Ra = 0.1 nm) were used to prepare arginine-glycine-aspartic acid-serine (RGDS)-APTS and arginine-glycine-glutamic acid-serine (RGES)-APTS (control) substrates. Focusing mainly on cell function, integrin and gene expression were all enhanced for rate osteosarcoma cells on surfaces containing grafted RGDS. Both sets of studies demonstrated that grafted molecules of RGD(S) enhance both osteoblast-like cell adhesion and function.
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Affiliation(s)
- A R El-Ghannam
- Center for Bioactive Materials and Tissue Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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43
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Peppas NA, Ward JH. Biomimetic materials and micropatterned structures using iniferters. Adv Drug Deliv Rev 2004; 56:1587-97. [PMID: 15350290 DOI: 10.1016/j.addr.2003.10.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2003] [Accepted: 05/15/2004] [Indexed: 11/18/2022]
Abstract
In the preparation of biomimetic materials it is often required that efficient methods of polymerization be used, often methods that can lead to biomimetic polymers with relatively narrow molecular weight distribution. Living radical polymerization techniques have successfully been used to create low polydispersity linear polymers by free-radical polymerizations. Although this technique slows down the polymerization of multifunctional monomers, there is little effect on the network structure due to the high concentration of pendent double bonds. There are applications of the living radical polymerization in the synthesis of block copolymers. Essentially, the technique involves polymerizing a single type of monomer first to create a macromonomer that is capable of acting as an initiator because of the reversible bond between the polymer end group and the terminating group. This terminating group may be a thiol or a halogen and, under the right conditions, will dissociate to form radicals. A second monomer is then added to the system and the polymerization proceeds with the second monomer chemically attached to the polymer of the first monomer. We review methods of creating biomimetic block copolymers using the iniferter radical polymerization technique. The block copolymers would be used in the synthesis of micropatterned polymer films for use in biomaterials and other biomedical applications.
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Affiliation(s)
- Nicholas A Peppas
- Department of Chemical Engineering, CPE 3.466, 1 University Station, C-0400, The University of Texas at Austin, Austin, TX 78712-0231, USA.
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Lim JY, Liu X, Vogler EA, Donahue HJ. Systematic variation in osteoblast adhesion and phenotype with substratum surface characteristics. ACTA ACUST UNITED AC 2004; 68:504-12. [PMID: 14762930 DOI: 10.1002/jbm.a.20087] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Time-varying interactions of human fetal osteoblastic cells (hFOB 1.19) with materials of diverse chemical composition and surface energy, including biodegradable lactide/glycolide-based polymers, were assessed using a combination of assays sensitive to different phases of cell-substratum compatibility. Short-term (minutes to hours) cell-attachment-rate assays were used to measure the earliest stages of cell-surface interactions leading to adhesion. Proliferation-rate assays quantifying viability of attached cells were applied as a measure of medium-term (hours to days) cytocompatibility. Both attachment- and proliferation-rate assays were found to strongly correlate with material surface energy, with the exception of a reproducible and significant adhesion preference for fully water-wettable quartz over glass. No such adhesion/proliferation preference was observed for hydrophobized counterparts, and attachment to water-wettable glass was significantly less than that to control tissue culture polystyrene. These results suggest that the amorphous SiO(x) surface was inhibitory to hFOB 1.19 growth whereas putatively crystalline quartz stimulated bioadhesion. Alkaline phosphatase activity was evaluated as a marker for long-term (days) differentiation of hFOB 1.19 cells and did not strongly correlate with surface energy or, in the case of biodegradable polymers, chemical composition.
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Affiliation(s)
- Jung Yul Lim
- Department of Orthopaedics and Rehabilitation, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania 17033, USA
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45
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Dupont-Gillain CC, Fauroux CMJ, Gardner DCJ, Leggett GJ. Use of AFM to probe the adsorption strength and time-dependent changes of albumin on self-assembled monolayers. ACTA ACUST UNITED AC 2003; 67:548-58. [PMID: 14566797 DOI: 10.1002/jbm.a.10092] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The adsorption kinetics of human serum albumin (HSA) on CH3- and COOH-terminated self-assembled monolayers (SAMs) has been investigated using radioassays and atomic force microscopy (AFM). On both surfaces, the amount of HSA adsorbed reached a plateau after 30 min. The plateau level was higher on the CH3 compared to the COOH surface. The adhesion force (Fadh), measured using Si3N4 AFM tips in water, decreased with time of contact with the HSA solution on the CH3 surface. This time-dependent change in the adhesiveness of the adsorbed protein is best explained by a change in the conformation or orientation. In contrast, Fadh was independent of the time of contact with the HSA solution on the COOH surface, indicating that once adsorbed, the HSA molecules do not undergo further conformation or orientation changes. The perturbation induced by scanning with the AFM in water on the adsorbed HSA layers was greater on CH3 surfaces than on COOH surfaces, suggesting a weaker protein-substratum interaction on the CH3-terminated SAMs. This was further confirmed by a stronger desorption of HSA following sodium dodecyl sulfate (SDS) treatment on the CH3 surface compared to the COOH surface. Taken together, these data suggest that for COOH SAMs, (1) there is a strong interaction between HSA and the substratum; (2) there is an absence of reorientation with time; and (3) there is a smaller amount of adsorbed protein at 24 h, possibly due to increased but rapid spreading/denaturation of the protein. On the CH3 surface, less deformation of HSA occurs and the molecules maintain a higher mobility at short adsorption times. AFM measurements performed after aging of an adsorbed HSA layer in buffer suggests the role played by HSA in solution in determining the time-dependent conformation and/or orientation changes.
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Affiliation(s)
- Ch C Dupont-Gillain
- Department of Chemistry, University of Manchester Institute of Science and Technology, PO Box 88, Manchester M60 1QD, United Kingdom
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46
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Luo N, Metters AT, Hutchison JB, Bowman CN, Anseth KS. A Methacrylated Photoiniferter as a Chemical Basis for Microlithography: Micropatterning Based on Photografting Polymerization. Macromolecules 2003. [DOI: 10.1021/ma0344341] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ning Luo
- Department of Chemical Engineering, University of Colorado, Boulder, Colorado 80309-0424; School of Dentistry, University of Colorado Health Sciences Center, Denver, Colorado 80262; and Howard Hughes Medical Institute, University of Colorado, Boulder, Colorado 80309-0424
| | - Andrew T. Metters
- Department of Chemical Engineering, University of Colorado, Boulder, Colorado 80309-0424; School of Dentistry, University of Colorado Health Sciences Center, Denver, Colorado 80262; and Howard Hughes Medical Institute, University of Colorado, Boulder, Colorado 80309-0424
| | - J. Brian Hutchison
- Department of Chemical Engineering, University of Colorado, Boulder, Colorado 80309-0424; School of Dentistry, University of Colorado Health Sciences Center, Denver, Colorado 80262; and Howard Hughes Medical Institute, University of Colorado, Boulder, Colorado 80309-0424
| | - Christopher N. Bowman
- Department of Chemical Engineering, University of Colorado, Boulder, Colorado 80309-0424; School of Dentistry, University of Colorado Health Sciences Center, Denver, Colorado 80262; and Howard Hughes Medical Institute, University of Colorado, Boulder, Colorado 80309-0424
| | - Kristi S. Anseth
- Department of Chemical Engineering, University of Colorado, Boulder, Colorado 80309-0424; School of Dentistry, University of Colorado Health Sciences Center, Denver, Colorado 80262; and Howard Hughes Medical Institute, University of Colorado, Boulder, Colorado 80309-0424
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47
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Keselowsky BG, Collard DM, García AJ. Surface chemistry modulates fibronectin conformation and directs integrin binding and specificity to control cell adhesion. J Biomed Mater Res A 2003; 66:247-59. [PMID: 12888994 DOI: 10.1002/jbm.a.10537] [Citation(s) in RCA: 740] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Integrin-mediated cell adhesion to proteins adsorbed onto synthetic surfaces anchors cells and triggers signals that direct cell function. In the case of fibronectin (Fn), adsorption onto substrates of varying properties alters its conformation/structure and its ability to support cell adhesion. In the present study, self-assembled monolayers (SAMs) of alkanethiols on gold were used as model surfaces to investigate the effects of surface chemistry on Fn adsorption, integrin binding, and cell adhesion. SAMs presenting terminal CH(3), OH, COOH, and NH(2) functionalities modulated adsorbed Fn conformation as determined through differences in the binding affinities of monoclonal antibodies raised against the central cell-binding domain (OH > COOH = NH(2) > CH(3)). Binding of alpha(5)beta(1) integrin to adsorbed Fn was controlled by SAM surface chemistry in a manner consistent with antibody binding (OH > COOH = NH(2) > CH(3)), whereas alpha(V) integrin binding followed the trend: COOH >> OH = NH(2) = CH(3), demonstrating alpha(5)beta(1) integrin specificity for Fn adsorbed onto the NH(2) and OH SAMs. Cell adhesion strength to Fn-coated SAMs correlated with alpha(5)beta(1) integrin binding (OH > COOH = NH(2) > CH(3)), and experiments with function-perturbing antibodies demonstrated that this receptor provides the dominant adhesion mechanism in this cell model. This work establishes an experimental framework to analyze adhesive mechanisms controlling cell-surface interactions and provides a general strategy of surface-directed control of adsorbed protein activity to manipulate cell function in biomaterial and biotechnological applications.
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Affiliation(s)
- Benjamin G Keselowsky
- Coulter School of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
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48
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Scotchford CA, Ball M, Winkelmann M, Vörös J, Csucs C, Brunette DM, Danuser G, Textor M. Chemically patterned, metal-oxide-based surfaces produced by photolithographic techniques for studying protein- and cell-interactions. II: Protein adsorption and early cell interactions. Biomaterials 2003; 24:1147-58. [PMID: 12527255 DOI: 10.1016/s0142-9612(02)00488-x] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Protein adsorption and adhesion of primary human osteoblasts on chemically patterned, metal-oxide-based surfaces comprising combinations of titanium, aluminium, vanadium and niobium were investigated. Single metal samples with a homogeneous surface and bimetal samples with a surface pattern produced by photolithographic techniques were used. The physical and chemical properties of the samples have been extensively characterised and are presented in a companion paper. Here, we describe their properties in terms of cell responses during the initial 24h of cell culture. Regarding the cell number and activity there was no significant difference between any of the single metal surfaces. However the morphology of cells on vanadium surfaces became spindle-like. In contrast to the behaviour on single metal samples, cells exhibited a pronounced reaction on bimetallic surfaces that contained aluminium. Cells tended to stay away from aluminium, which was the least favoured metal in all two-metal combinations. An initial cell alignment relative to the pattern geometry was detectable after 2h and was fully developed after 18h of incubation. The organisation of f-actin and microtubules as well as the localisation of vinculin were all more pronounced on non-aluminium regions. We hypothesised that the differences in cell response could be associated with differences in the adsorption of serum proteins onto the various metal oxides. Protein adsorption experiments were performed using microscopy in conjunction with immunofluorescent stains. They indicated that both fibronectin and albumin adsorption were significantly greater on the non-aluminium regions, suggesting that differences in cellular response correlate with a modulation of the concentration of serum proteins on the surface.
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Affiliation(s)
- C A Scotchford
- Schools of Biomedical Sciences and Mechanical Materials Manufacturing Engineering and Management, University of Nottingham, Wolfson Building University Park, NG9 2RD, Nottingham, UK.
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Bianchi F, Vozzi G, Pescia C, Domenici C, Ahluwalia A. A comparative study of chemical derivatisation methods for spatially differentiated cell adhesion on 2-dimensional microfabricated polymeric matrices. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2003; 14:1077-96. [PMID: 14661880 DOI: 10.1163/156856203769231574] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This paper describes a study of surface derivatisation methods applied to two-dimensional polymer matrices microfabricated using the Pressure-Assisted Microsyringe (PAM) technique. A blend of polylactide and polycaprolactone was used as the matrix material, and surface chemistry techniques based on silanes and polyethyleneglycol (PEG) derivatives were employed to render the surface underlying the scaffold anti-adhesive whilst polylysine was covalently coupled to the surface of the polymer matrix to enhance cell adhesion. Prior to cell-adhesion tests, the surfaces and matrices were analysed using physico-chemical techniques, such as surface tension, surface potential and fluorescence. Adhesion of primary endothelial cells was evaluated using cell counting techniques. The results demonstrate that both PEGs and silanes are about 66% efficient at demarcating endothelial cell adhesion in short term experiments and that covalently-bound polylysine to the polymer matrix increases cell adhesion twofold with respect to the adsorbed polypeptide.
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Affiliation(s)
- Francesca Bianchi
- Interdepartmental Research Centre E. Piaggio, University of Pisa, Via Diotisalvi 2, 56216 Pisa, Italy
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50
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Monchau F, Lefèvre A, Descamps M, Belquin-myrdycz A, Laffargue P, Hildebrand HF. In vitro studies of human and rat osteoclast activity on hydroxyapatite, beta-tricalcium phosphate, calcium carbonate. BIOMOLECULAR ENGINEERING 2002; 19:143-52. [PMID: 12202175 DOI: 10.1016/s1389-0344(02)00023-0] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Investigations on the ceramic degradation caused by osteoclasts are designed to assess osteoclast-ceramic interactions and to determine which ceramics are more suitable for use as bone substitute. This study investigated the resorptive activity of osteoclasts on ceramics presenting different solubility rates. Osteoclasts isolated from new-born rat and from human giant cell tumour were cultured on different bioceramics: hydroxyapatite (HA), beta-tricalcium phosphate (TCP) and calcium carbonate (calcite). Cytoskeletal was revealed by actin labelling and ceramic surfaces were observed by scanning electron microscopy (SEM). On all materials, the distribution of actin in typical ring was revealed. SEM examinations showed a clear difference in the shape and the depth of resorption lacunae on different ceramics. On pure HA, a superficial attack, clearly visible but very little extended. Numerous resorption lacunae, deep and well-delimited were observed on pure beta-TCP, but attacks less punctually were detected too. On pure calcite, an attack with form of spikes, very widespread but superficial was revealed. Degradation measurements revealed a significant increase of P release from the phosphocalcic ceramics and of Ca from all ceramics in the presence of osteoclasts. The both cell models found these characteristics, the rat osteoclasts were also an excellent model to study the ceramic resorption.
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Affiliation(s)
- F Monchau
- Laboratoire de Recherche sur les Biomatériaux, Département de Biophysique, Faculté de Médecine, UPRES EA 1049, 1, Place de Verdun, F-59045 Lille Cedex, France.
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