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Yakufu M, Wang Z, Wang Y, Jiao Z, Guo M, Liu J, Zhang P. Covalently functionalized poly(etheretherketone) implants with osteogenic growth peptide (OGP) to improve osteogenesis activity. RSC Adv 2020; 10:9777-9785. [PMID: 35498607 PMCID: PMC9050223 DOI: 10.1039/d0ra00103a] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Accepted: 02/15/2020] [Indexed: 11/21/2022] Open
Abstract
Polyetheretherketone (PEEK), as the most promising implant material for orthopedics and dental applications, has bone-like stiffness, excellent fatigue resistance, X-ray transparency, and near absence of immune toxicity. However, due to biological inertness, its bone conduction and bone ingrowth performance is limited. The surface modification of PEEK is an option to overcome these shortcomings and retain most of its favorable properties, especially when excellent osseointegration is desired. In this study, a simple reaction procedure was employed to bind the osteogenic growth peptide (OGP) on the surface of PEEK materials by covalent chemical grafting to construct a bioactive interface. The PEEK surface was activated by N,N′-disuccinimidyl carbonate (DSC) after hydroxylation, and then OGP was covalently grafted with amino groups. The functionalized surface of PEEK samples were characterized by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), water contact angle measurement and biological evaluation in vitro. OGP-functionalized PEEK surface significantly promoted the attachment, proliferation, alkaline phosphatase (ALP) activity and mineralization of pre-osteoblast cells (MC3T3-E1). The in vivo rat tibia implantation model is adopted and micro-CT analyses demonstrated that the OGP coating significantly promoted new bone formation around the samples. The in vitro and in vivo results reveal that the modification by covalent chemical functionalization with OGP on PEEK surface can augment new bone formation surrounding implants compared to bare PEEK and PEEK implant modified by covalently attached OGP is promising in orthopedic and dental applications. Polyetheretherketone (PEEK), as the most promising implant material for orthopedics and dental applications, has bone-like stiffness, excellent fatigue resistance, X-ray transparency, and near absence of immune toxicity.![]()
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Affiliation(s)
- Maihemuti Yakufu
- Department of Orthopaedics
- The First Hospital of Jilin University
- Changchun
- China
- Key Laboratory of Polymer Ecomaterials
| | - Zongliang Wang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Yu Wang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Zixue Jiao
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Min Guo
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Jianguo Liu
- Department of Orthopaedics
- The First Hospital of Jilin University
- Changchun
- China
| | - Peibiao Zhang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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Sridar S, Churchward MA, Mushahwar VK, Todd KG, Elias AL. Peptide modification of polyimide-insulated microwires: Towards improved biocompatibility through reduced glial scarring. Acta Biomater 2017; 60:154-166. [PMID: 28735029 DOI: 10.1016/j.actbio.2017.07.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 07/01/2017] [Accepted: 07/18/2017] [Indexed: 01/12/2023]
Abstract
The goal of this study is to improve the integration of implanted microdevices with tissue in the central nervous system (CNS). The long-term utility of neuroprosthetic devices implanted in the CNS is affected by the formation of a scar by resident glial cells (astrocytes and microglia), limiting the viability and functional stability of the devices. Reduction in the proliferation of glial cells is expected to enhance the biocompatibility of devices. We demonstrate the modification of polyimide-insulated microelectrodes with a bioactive peptide KHIFSDDSSE. Microelectrode wires were functionalized with (3-aminopropyl) triethoxy silane (APTES); the peptide was then covalently bonded to the APTES. The soluble peptide was tested in 2D mixed cultures of astrocytes and microglia, and reduced the proliferation of both cell types. The interactions of glial cells with the peptide-modified wires was then examined in 3D cell-laden hydrogels by immunofluorescence microscopy. As expected for uncoated wires, the microglia were first attracted to the wire (7days) followed by astrocyte recruitment and hypertrophy (14days). For the peptide-treated wires, astrocytes coated the wires directly (24h), and formed a thin, stable coating without evidence of hypertrophy, and the attraction of microglia to the wire was significantly reduced. The results suggest a mechanism to improve tissue integration by promoting uniform coating of astrocytes on a foreign body while lessening the reactive response of microglia. We conclude that the bioactive peptide KHIFSDDSSE may be effective in improving the biocompatibility of neural interfaces by both reducing acute glial reactivity and generating stable integration with tissue. STATEMENT OF SIGNIFICANCE The peptide KHIFSDDSSE has previously been shown in vitro to both reduce the proliferation of astrocytes, and to increase the adhesion of astrocyte to glass substrates. Here, we demonstrate a method to apply uniform coatings of peptides to microwires, which could readily be generalized to other peptides and surfaces. We then show that when peptide-modified wires are inserted into 3D cell-laden hydrogels, the normal cellular reaction (microglial activation followed by astrocyte recruitment and hypertrophy) does not occur, rather astrocytes are attracted directly to the surface of the wire, forming a relatively thin and uniform coating. This suggests a method to improve tissue integration of implanted devices to reduce glial scarring and ultimately reduce failure of neural interfaces.
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Affiliation(s)
- Sangita Sridar
- Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada; Alberta Innovates-Health Solutions Interdisciplinary Team in Smart Neural Prostheses (Project SMART), University of Alberta, AB, Canada
| | - Matthew A Churchward
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, AB T6G 2G3, Canada; Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6G 2E1, Canada; Alberta Innovates-Health Solutions Interdisciplinary Team in Smart Neural Prostheses (Project SMART), University of Alberta, AB, Canada
| | - Vivian K Mushahwar
- Division of Physical Medicine and Rehabilitation, University of Alberta, Edmonton, AB T6G 2E1, Canada; Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6G 2E1, Canada; Alberta Innovates-Health Solutions Interdisciplinary Team in Smart Neural Prostheses (Project SMART), University of Alberta, AB, Canada
| | - Kathryn G Todd
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, AB T6G 2G3, Canada; Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6G 2E1, Canada; Alberta Innovates-Health Solutions Interdisciplinary Team in Smart Neural Prostheses (Project SMART), University of Alberta, AB, Canada
| | - Anastasia L Elias
- Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada; Alberta Innovates-Health Solutions Interdisciplinary Team in Smart Neural Prostheses (Project SMART), University of Alberta, AB, Canada.
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Mangindaan D, Yared I, Kurniawan H, Sheu JR, Wang MJ. Modulation of biocompatibility on poly(vinylidene fluoride) and polysulfone by oxygen plasma treatment and dopamine coating. J Biomed Mater Res A 2012; 100:3177-88. [DOI: 10.1002/jbm.a.34251] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 04/25/2012] [Accepted: 05/01/2012] [Indexed: 11/09/2022]
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Jun HW, West J. Development of a YIGSR-peptide-modified polyurethaneurea to enhance endothelialization. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:73-94. [PMID: 15027844 DOI: 10.1163/156856204322752246] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Polyurethanes have been investigated for use as vascular grafts due to their excellent mechanical properties and relatively good biocompatibility. However, poor retention of endothelial cells and thrombogenicity in vivo remain problematic for vascular graft applications. The peptide YIGSR has been shown to increase endothelial cell adhesion but not attachment of platelets, suggesting its possible utility for vascular graft applications. In this study, a bioactive polyurethaneurea has been synthesized by incorporating GGGYIGSRGGGK peptide sequences into the polymer backbone. Successful incorporation of the peptides was confirmed by NMR, contact angle measurement and ESCA. Uniform distribution of peptides on the surface was observed using a fluorescent probe capable of reacting with tyrosine residues on the peptides. Hard segment domains were visualized using tapping mode AFM. Endothelial cell adhesion, spreading, proliferation, migration and extra-cellular matrix production were improved on bioactive polyurethaneurea compared to control polyurethaneurea. Competitive inhibition of endothelial cell attachment and spreading by soluble YIGSR peptides indicated that cell adhesion and spreading were specifically mediated by YIGSR-sensitive cell adhesion receptor, not just by changed surface properties. There was no significant difference in the number of adherent platelets. Therefore, this bioactive polyurethanurea may improve vascular graft endothelialization without increasing thrombogenicity.
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Affiliation(s)
- Ho-Wook Jun
- Department of Bioengineering, Rice University, 6100 Main Street MS 142, Houston, TX 77005-1892, USA
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5
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Deichmann T, McCord MG, Bourham MA, Gries T. Analysis of atmospheric pressure plasma parameters during treatment of polyethylene terephthalate films. J Appl Polym Sci 2011. [DOI: 10.1002/app.33557] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sala A, Ehrbar M, Trentin D, Schoenmakers RG, Vörös J, Weber FE. Enzyme mediated site-specific surface modification. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11127-11134. [PMID: 20545368 DOI: 10.1021/la1008895] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Stable tethering of bioactive peptides like RGD to surfaces can be achieved via chemical bonding, biotin streptavidin interaction, or photocross-linking. More challenging is the immobilization of proteins, since methods applied to immobilize peptides are either not specific or versatile enough or might even compromise the protein's bioactivity. To overcome this limitation, we have employed a scheme that by enzymatic (transglutaminase) reaction allows the site-directed and site-specific coupling of growth factors and other molecules to nonfouling poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) coated surfaces under physiological conditions. By our modular and flexible design principle, we are able to functionalize these surfaces directly with peptides and growth factors or precisely position poly(ethylene glycol) (PEG)-like hydrogels for the presentation of growth factors as exemplified with vascular endothelial growth factor (VEGF).
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Affiliation(s)
- Ana Sala
- Department of Cranio-Maxillofacial Surgery, Oral Biotechnology & Bioengineering, University Hospital Zurich and Dental School, University of Zurich, Switzerland
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7
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Cavalcanti-Adam EA, Aydin D, Hirschfeld-Warneken VC, Spatz JP. Cell adhesion and response to synthetic nanopatterned environments by steering receptor clustering and spatial location. HFSP JOURNAL 2008; 2:276-85. [PMID: 19404439 DOI: 10.2976/1.2976662] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Accepted: 08/09/2008] [Indexed: 12/27/2022]
Abstract
During adhesion and spreading, cells form micrometer-sized structures comprising transmembrane and intracellular protein clusters, giving rise to the formation of what is known as focal adhesions. Over the past two decades these structures have been extensively studied to elucidate their organization, assembly, and molecular composition, as well as to determine their functional role. Synthetic materials decorated with biological molecules, such as adhesive peptides, are widely used to induce specific cellular responses dependent on cell adhesion. Here, we focus on how surface patterning of such bioactive materials and organization at the nanoscale level has proven to be a useful strategy for mimicking both physical and chemical cues present in the extracellular space controlling cell adhesion and fate. This strategy for designing synthetic cellular environments makes use of the observation that most cell signaling events are initiated through recruitment and clustering of transmembrane receptors by extracellular-presented signaling molecules. These systems allow for studying protein clustering in cells and characterizing the signaling response induced by, e.g., integrin activation. We review the findings about the regulation of cell adhesion and focal adhesion assembly by micro- and nanopatterns and discuss the possible use of substrate stiffness and patterning in mimicking both physical and chemical cues of the extracellular space.
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Affiliation(s)
- Elisabetta Ada Cavalcanti-Adam
- Department of New Materials and Biosystems, Max-Planck-Institute for Metals Research, Heisenbergstrasse 3, 70569 Stuttgart, Germany and Department of Biophysical Chemistry, University of Heidelberg, Heisenbergstrasse 3, 70569 Stuttgart, Germany
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8
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Grigoriou V, Shapiro IM, Cavalcanti-Adam EA, Composto RJ, Ducheyne P, Adams CS. Apoptosis and Survival of Osteoblast-like Cells Are Regulated by Surface Attachment. J Biol Chem 2005; 280:1733-9. [PMID: 15522882 DOI: 10.1074/jbc.m402550200] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We tested the hypothesis that RGDS peptides regulate osteoblast survival in culture. Osteoblast-like MC3T3-E1 cells were allowed to attach to RGDS peptides that had been tethered to a silicone surface utilizing a previously described grafting technique. The RGDS-modified surface caused up-regulation of alpha(v)beta(3) integrin. We noted that there was an increase in expression of activated focal adhesion kinase and activated Akt. There was no change in the expression level of the anti-apoptotic protein Bcl-2, the pro-apoptotic protein Bad, or the inactivated form of Bad, pBad. Attachment to the RGDS-treated membrane completely abolished apoptosis induced by staurosporine, the Ca(2+).P(i) ion pair, and sodium nitroprusside. However, the surface modification did not interfere with apoptosis mediated by the free RGDS peptide or serum-free medium. When the activity of the phosphatidylinositol 3-kinase pathway was inhibited, RGDS-dependent resistance to apoptosis was eliminated. These results indicated that the binding of cells to RGDS abrogated apoptosis via the mitochondrial pathway and that the suppression of apoptosis was dependent on the activity of phosphatidylinositol 3-kinase.
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Affiliation(s)
- Vavara Grigoriou
- Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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9
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Hasenbein ME, Andersen TT, Bizios R. Micropatterned surfaces modified with select peptides promote exclusive interactions with osteoblasts. Biomaterials 2002; 23:3937-42. [PMID: 12162326 DOI: 10.1016/s0142-9612(02)00129-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Microcontact printing techniques were used to pattern circles (diameters 10. 50, 100, and 200 microm) of N1[3-(trimethoxysilyl)-propyl]diethylenetriamine (DETA) surrounded by octadecyltrichlorosilane (OTS) borders on borosilicate glass, a model substrate. The DETA regions were further modified by immobilization of either the cell-adhesive peptides Arginine-Glycine-Aspartic Acid-Serine (RGDS) and Lysine-Arginine-Serine-Arginine (KRSR) or the non-adhesive peptides Arginine-Aspartic Acid-Glycine-Serine (RDGS) and Lysine-Serine-Serine-Arginine (KSSR). After four hours under standard cell culture conditions but in the absence of serum, adhesion of either osteoblasts or fibroblasts on surfaces patterned with the non-adhesive peptides RDGS and KSSR was random and low. In contrast, both osteoblasts and fibroblasts adhered and formed clusters onto circles modified with the adhesive peptide RGDS, whereas only osteoblasts adhered and formed clusters onto the circles modified with KRSR, a peptide that selectively promotes adhesion of osteoblasts. These results provide evidence that patterning of select peptides can direct adhesion of specific cell lines exclusively to predetermined regions on material surfaces.
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Affiliation(s)
- M E Hasenbein
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA
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10
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Ramires PA, Mirenghi L, Romano AR, Palumbo F, Nicolardi G. Plasma-treated PET surfaces improve the biocompatibility of human endothelial cells. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 51:535-9. [PMID: 10880099 DOI: 10.1002/1097-4636(20000905)51:3<535::aid-jbm31>3.0.co;2-p] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Failures of small internal diameter vascular grafts have been caused by the lack of a stable endothelial lining to form on their artificial surfaces. Polymer surfaces can be optimized by means of proper treatment to allow a homogeneous and uniform coverage in artificial prosthesis applications. Several solutions were studied to improve cell attachment and growth on artificial materials. In the present study, polyethyleneterephthalate (PET) surfaces were treated by plasma processes with oxygen and ammonia and also in the presence of a gas mixture to verify the effect of functional groups grafting onto the endothelial cell growth. Related surface chemical modifications were investigated by X-ray photoelectron spectroscopy (XPS). Then using cytotoxicity and cytocompatibility tests, the biocompatibility of the modified PET surfaces was assessed by studying the behavior of human umbilical vein endothelial cells (HUVEC). The results showed that plasma-treated PET samples have no toxic effect on HUVEC. The cytocompatibility tests revealed an increase in cell growth with incubation time and the presence of well-spread and flattened cells (SEM analyses). Thus it is reported that plasma treatments can improve PET biocompatibility to HUVEC.
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Affiliation(s)
- P A Ramires
- PASTIS-CNRSM, Centro Nazionale Ricerca e Sviluppo Materiali, S.S. 7 Appia, Km 714, 72100 Brindisi, Italy.
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11
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Webster TJ, Ergun C, Doremus RH, Siegel RW, Bizios R. Specific proteins mediate enhanced osteoblast adhesion on nanophase ceramics. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 51:475-83. [PMID: 10880091 DOI: 10.1002/1097-4636(20000905)51:3<475::aid-jbm23>3.0.co;2-9] [Citation(s) in RCA: 539] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Osteoblast, fibroblast, and endothelial cell adhesion on nanophase (that is, materials with grain sizes less than 100 nm) alumina, titania, and hydroxyapatite (HA) was investigated using in vitro cellular models. Osteoblast adhesion was significantly (p < 0.01) greater after 4 h on nanophase alumina, titania, and HA than it was on conventional formulations of the same ceramics. In contrast, compared to conventional alumina, titania, and HA, after 4 h fibroblast adhesion was significantly (p < 0.01) less on nanophase ceramics. Examination of the underlying mechanism(s) of cell adhesion on nanophase ceramics revealed that these ceramics adsorbed significantly (p < 0.01) greater quantities of vitronectin, which, subsequently, may have contributed to the observed select enhanced adhesion of osteoblasts. Select enhanced osteoblast adhesion was independent of surface chemistry and material phase but was dependent on the surface topography (specifically on grain and pore size) of nanophase ceramics. The capability of synthesizing and processing nanomaterials with tailored (through, for example, specific grain and pore size) structures and topographies to control select subsequent cell functions provides the possibility of designing the novel proactive biomaterials (that is, materials that elicit specific, timely, and desirable responses from surrounding cells and tissues) necessary for improved implant efficacy.
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Affiliation(s)
- T J Webster
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
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12
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Cargill RS, Dee KC, Malcolm S. An assessment of the strength of NG108-15 cell adhesion to chemically modified surfaces. Biomaterials 1999; 20:2417-25. [PMID: 10614946 DOI: 10.1016/s0142-9612(99)00169-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The strength of adhesion of NG108-15 cells to glass substrates modified with adsorbed proteins (laminin and poly-ornithine) or modified with covalently bound peptides (tri-ornithine and Tyr-Ile-Gly-Ser-Arg) was quantitatively assessed, by determining the shear stresses necessary to denude the cells from substrates using a spinning disk device. The shear stresses required to detach NG108-15 cells from glass modified with either adsorbed poly-ornithine or with both poly-ornithine and laminin were significantly (P < 0.05) higher than the shear stresses required to detach the cells from plain glass substrates. Covalent surface modifications resulted in higher strengths of NG108-15 adhesion than were exhibited on surfaces modified with adsorbed proteins. NG108-15 cell adhesion strength was maximal on surfaces covalently modified with only amine groups (without any peptides or proteins). These results indicate that general (i.e., not necessarily receptor-specific) surface modification strategies, which increase the net surface charge of a substrate, will elicit strong adhesion of NG108-15 cells.
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Affiliation(s)
- R S Cargill
- School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332-0405, USA.
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13
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Zreiqat H, Evans P, Howlett CR. Effect of surface chemical modification of bioceramic on phenotype of human bone-derived cells. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1999; 44:389-96. [PMID: 10397942 DOI: 10.1002/(sici)1097-4636(19990315)44:4<389::aid-jbm4>3.0.co;2-o] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In the search for methods to improve the biocompatibility of prosthetic materials, attention has recently been directed toward the potential use of surface chemical modification and its influence on cellular behavior. This in vitro study investigates the effect of surface chemistry modification of bioceramics on human bone-derived cells (HBDCs) grown on biomaterial surfaces for 2 weeks. Cells were cultured on either alumina (Al2O3), alumina doped with magnesium ions ([Mg]-Al2O3), or hydroxyapatite (HAP), as well as tissue culture polystyrene (TCPS). Expression of alkaline phosphatase (ALP), thrombospondin (Tsp), osteopontin (OP), osteocalcin (OC), osteonectin (ON/SPARC), type I collagen (Col I), and bone sialoprotein (BSP) were determined in terms of mRNAs and proteins. Protein levels for ALP, OP, OC, and BSP were significantly (p < 0. 05) greater at day 5 in HBDCs cultured on [Mg]-Al2O3 compared to those cells grown on Al2O3. At day 14 the levels of ALP, Tsp, Col I, OP, ON/SPARC, and BSP rose significantly (p < 0.05) above those occurring in HBDCs grown on Al2O3, HAP, and TCPS. This suggests that HBDCs from the same patient respond to differences in the surface chemical groups. This study confirms that the chemistry of a substratum, which facilitates cellular adhesion, will enhance cellular differentiation.
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Affiliation(s)
- H Zreiqat
- Bone Biomaterial Unit, School of Pathology, University of New South Wales, Sydney 2052, Australia
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Olbrich KC, Andersen TT, Blumenstock FA, Bizios R. Surfaces modified with covalently-immobilized adhesive peptides affect fibroblast population motility. Biomaterials 1996; 17:759-64. [PMID: 8730959 DOI: 10.1016/0142-9612(96)81412-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Cell population motility and adhesion of rat skin fibroblasts were evaluated on aminophase glass modified with covalently-immobilized biologically active peptides, specifically, either arginine glycine-aspartic acid-serine (RGDS) or tyrosine-isoleucine-glycine-serine-arginine-glycine (YIGSRG). Fibroblast population motility was decreased and adhesion was increased on substrates modified with covalently immobilized RGDS peptide compared to substrates with the covalently immobilized non-adhesive peptides arginine-glycine-glutamic acid-serine and arginine-aspartic acid-glycine-serine. Fibroblast motility was not significantly changed on substrates modified with covalently-immobilized YIGSRG peptide; however, fibroblast adhesion was decreased on that substrate.
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Affiliation(s)
- K C Olbrich
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA
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15
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Dee KC, Rueger DC, Andersen TT, Bizios R. Conditions which promote mineralization at the bone-implant interface: a model in vitro study. Biomaterials 1996; 17:209-15. [PMID: 8624397 DOI: 10.1016/0142-9612(96)85765-6] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This in vitro study was an investigation of osteoblast functions on glass substrates modified with the bioactive peptide Arg-Gly-Asp-Ser (RGDS) in the absence and presence of recombinant human Osteogenic Protein-1 (OP-1); control substrates were plain glass, glass modified with amine groups, and glass modified with the non-adhesive peptide Arg-Asp-Gly-Ser. In serum-free cell culture medium, osteoblasts adhered in greater numbers (P < 0.1) to glass modified with RGDS, compared to adhesion on all other substrate types tested in the present study. In the presence of serum proteins, osteoblasts adhered similarly to all substrate types examined, in the absence or presence of 100 ng ml-1 OP-1. The presence of 100 ng ml-1 OP-1 inhibited (P < 0.1) 72 h proliferation of sparsely seeded (2500 cells cm-2) cultures on all substrates examined in the present study. OP-1 (100 ng ml-1) promoted 21 day mineralization on all substrates examined; in addition, mineralization was further enhanced in osteoblast cultures grown on glass modified with the adhesive peptide RGDS. The present study establishes conditions which can be utilized in the design of dental/orthopaedic biomaterials which elicit timely, specific responses from surrounding bone tissue.
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Affiliation(s)
- K C Dee
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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