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Human plasma protein adsorption to elastin-like polypeptide nanoparticles. Biointerphases 2020; 15:021007. [DOI: 10.1116/6.0000027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Effect of Plasma Treatment of Titanium Surface on Biocompatibility. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9112257] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
It was recently reported that implant osseointegration is affected by surface wettability. The relationship between hydrophilicity and cell adhesion was corroborated by numerous in vivo studies. Concentrated alkali improves the biocompatibility of pure titanium. Research was conducted on the mechanism by which this treatment increases hydrophilicity. In the present study, we used atmospheric pressure plasma processing to enhance the hydrophilicity of the material surface. The aim was to assess its influences on the initial adhesion of the material to rat bone marrow and subsequent differentiation into hard tissue. Superhydrophilicity was induced on a pure titanium surface with a piezobrush, a simple, compact alternative to the conventional atmospheric pressure plasma device. No structural change was confirmed by Scanning electron microscope (SEM) or scanning probe microscopy (SPM) observation. X-ray photoelectron spectroscopy (XPS) analysis presented with hydroxide formation and a reduction in the C peak. A decrease in contact angle was also observed. The treated samples had higher values for in vitro bovine serum albumin (BSA) adsorption, rat bone marrow (RBM) cell initial adhesion, alkaline phosphatase activity (ALP) activity tests, and factors related to bone differentiation than the untreated control. The present study indicated that the induction of superhydrophilicity in titanium via atmospheric pressure plasma treatment with a piezobrush affects RBM cell adhesion and bone differentiation without altering surface properties.
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Optimized Surface Characteristics and Enhanced in Vivo Osseointegration of Alkali-Treated Titanium with Nanonetwork Structures. Int J Mol Sci 2019; 20:ijms20051127. [PMID: 30841636 PMCID: PMC6429490 DOI: 10.3390/ijms20051127] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 02/28/2019] [Accepted: 02/28/2019] [Indexed: 02/02/2023] Open
Abstract
Alkali-treated titanium (Ti) with a porous, homogeneous, and uniform nanonetwork structure (TNS) that enables establishment of a more rapid and firmer osteointegration than titanium has recently been reported. However, the mechanisms underlying the enhanced osteogenic activity on TNS remains to be elucidated. This study aimed to evaluate the surface physicochemical properties of Ti and TNS, and investigate osteoinduction and osteointegration in vivo. Surface characteristics were evaluated using scanning electron microscopy (SEM), scanning probe microscopy (SPM), and X-ray photoelectron spectrometry (XPS), and the surface electrostatic force of TNS was determined using solid zeta potential. This study also evaluated the adsorption of bovine serum albumin (BSA) and human plasma fibronectin (HFN) on Ti and TNS surfaces using quartz crystal microbalance (QCM) sensors, and apatite formation on Ti and TNS surfaces was examined using a simulated body fluid (SBF) test. Compared with Ti, the newly developed TNS enhanced BSA and HFN absorbance capacity and promoted apatite formation. Furthermore, TNS held less negative charge than Ti. Notably, sequential fluorescence labeling and microcomputed tomography assessment indicated that TNS screws implanted into rat femurs exhibited remarkably enhanced osteointegration compared with Ti screws. These results indicate that alkali-treated titanium implant with a nanonetwork structure has considerable potential for future clinical applications in dentistry and orthopedics.
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Koslen MM, Eskew MW, Pinkert V, Hoang H, Manyanga F, Dean WL, Chaires JB, Benight AS. Capture Reagent and Strategy for Retrieving Albumin-Bound Ligands from Plasma. ACTA ACUST UNITED AC 2019. [DOI: 10.4236/abc.2019.93009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Delgado JD, Surmaitis RL, Arias CJ, Schlenoff JB. Surface sulfonates lock serum albumin into a “hard” corona. Biomater Sci 2019; 7:3213-3225. [DOI: 10.1039/c9bm00475k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Albumin is more easily displaced on a surface bearing carboxylate compared to sulfonate functionality, which controls the composition of the eventual protein corona.
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Affiliation(s)
- Jose D. Delgado
- Department of Chemistry and Biochemistry
- Florida State University
- Tallahassee
- USA
| | | | - Carlos J. Arias
- Department of Chemistry and Biochemistry
- Florida State University
- Tallahassee
- USA
| | - Joseph B. Schlenoff
- Department of Chemistry and Biochemistry
- Florida State University
- Tallahassee
- USA
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6
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Perspectives on the use of biomaterials to store platelets for transfusion. Biointerphases 2016; 11:029701. [DOI: 10.1116/1.4952450] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Komasa S, Yingmin S, Taguchi Y, Yamawaki I, Tsutsumi Y, Kusumoto T, Nishizaki H, Miyake T, Umeda M, Tanaka M, Okazaki J. Bioactivity of Titanium Surface Nanostructures Following Chemical Processing and Heat Treatment. J HARD TISSUE BIOL 2015. [DOI: 10.2485/jhtb.24.257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Satoshi Komasa
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University
| | - Su Yingmin
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University
| | | | - Isao Yamawaki
- Department of Periodontology, Osaka Dental University
| | - Yoshifumi Tsutsumi
- Department of Fixed Prosthodontics and Occlusion, Osaka Dental University
| | - Tetsuji Kusumoto
- Department of Fixed Prosthodontics and Occlusion, Osaka Dental University
| | - Hiroshi Nishizaki
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University
| | - Tatsuro Miyake
- Department of Preventive and Community Dentistry, Osaka Dental University
| | - Makoto Umeda
- Department of Periodontology, Osaka Dental University
| | - Masahiro Tanaka
- Department of Fixed Prosthodontics and Occlusion, Osaka Dental University
| | - Joji Okazaki
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University
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Chang YC, Feng SW, Huang HM, Teng NC, Lin CT, Lin HK, Wang PD, Chang WJ. Surface analysis of titanium biological modification with glow discharge. Clin Implant Dent Relat Res 2013; 17:469-75. [PMID: 23981288 DOI: 10.1111/cid.12141] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Glow discharge plasma (GDP) technology has been used to graft various proteins to the titanium surface, including albumin, type I collagen, but without fibronectin. PURPOSE The aim of this study was to evaluate and analyze the physical properties of fibronectin-grafted titanium surfaces after GDP treatment. MATERIALS AND METHODS Grade II titanium discs after cleaning and autoclaving were considered as original specimens, thus divided into four groups. The groups were different upon two treatments (GDP only and fibronectin grafting after GDP) and two storage temperature (4°C and 25°C). The implant surface morphology was characterized by scanning electron microscopy (SEM), roughness measurement, and wettability evaluation. The concentration relationship of fibronectin was by fluorescein isothiocyanate (FITC) labeling. RESULTS SEM images showed that regular planar texture revealed on the surface of GDP-treated group, and irregular-folding protein was found on the fibronectin-grafted discs. Fibronectin-grafted groups had higher hydrophilicity and greater surface roughness than GDP-treated specimens. The storage temperature did not make obvious difference on the surface topography, wettability, and roughness. The number of fibronectin dots on the titanium surface labeling by FITC had positive relationship with the concentration of fibronectin solution used. CONCLUSIONS Biologically modified titanium surface is more hydrophilic and rougher than GDP-treated ones. GDP treatment combined with fibronectin grafting increased the surface hydrophilicity and surface roughness of titanium discs, which may attribute to the affinity of cell adhesion, migration, proliferation, and differentiation.
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Affiliation(s)
- Yu-Chi Chang
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Sheng-Wei Feng
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Haw-Ming Huang
- Graduate Institute of Biomedical Materials & Tissue Engineering, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Nai-Chia Teng
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,Dental Department, Taipei Medical University Hospital, Taipei, Taiwan
| | - Che-Tong Lin
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,Dental Department, Taipei Medical University Hospital, Taipei, Taiwan
| | - Hsi-Kuei Lin
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,Dental Department of Taipei Medical University, Shuang-Ho Hospital, Taipei, Taiwan
| | - Peter-D Wang
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Wei-Jen Chang
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,Dental Department of Taipei Medical University, Shuang-Ho Hospital, Taipei, Taiwan
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Renò F, Rizzi M, Cannas M. Gelatin-based anionic hydrogel as biocompatible substrate for human keratinocyte growth. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:565-571. [PMID: 22160746 DOI: 10.1007/s10856-011-4519-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Accepted: 12/06/2011] [Indexed: 05/31/2023]
Abstract
Ionic hydrogels are biocompatible candidates for skin tissue engineering. Two hydrogels synthesized by crosslinking gelatin with polylysine (positively charged HG1) or polyglutamic acid (negatively charged HG2) were tested using spontaneously immortalized human keratinocytes (HaCaT). HaCaT cells displayed higher adhesion and proliferation onto HG2, forming a continuous and stratified epithelium after 7 days. Moreover HaCaT cells grown onto HG2 showed a decreased Epilysin and Filaggrin expression, while transglutaminase-1 expression was increased. Those data indicate that human keratinocyte can form a stratified epithelium onto HG2 that could therefore be an useful tool for skin tissue engineering.
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Affiliation(s)
- Filippo Renò
- Research Centre for Biocompatibility and Tissue Engineering, Department of Experimental and Clinical Medicine, University of Eastern Piedmont A. Avogadro, Novara, Italy.
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Svendsen IE, Santos O, Sotres J, Wennerberg A, Breding K, Arnebrant T, Lindh L. Adsorption of HSA, IgG and laminin-1 on model hydroxyapatite surfaces--effects of surface characteristics. BIOFOULING 2012; 28:87-97. [PMID: 22257270 DOI: 10.1080/08927014.2011.653562] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Ellipsometry and mechanically assisted sodium dodecyl sulphate elution was utilized to study the adsorption of human serum albumin (HSA), human immunoglobulin G (IgG), and laminin-1, as well as competitive adsorption from a mixture of these proteins on spin-coated and sintered hydroxyapatite (HA) surfaces, respectively. The HA surfaces were characterized with respect to wettability and roughness by means of water contact angles and atomic force microscopy, respectively. Both surface types were hydrophilic, and the average roughness (Sa) and surface enlargement (Sdr) were lower for the sintered compared to the spin-coated HA surfaces. The adsorbed amounts on the sintered HA increased as follows: HSA < laminin-1 < IgG < the protein mixture. For the competitive adsorption experiments, the adsorbed fractions increased accordingly: HSA < laminin-1 < IgG on both types of HA substratum. However, a higher relative amount of HSA and laminin-1 and a lower relative amount of IgG was found on the spin-coated surfaces compared to the sintered surfaces. The effects observed could be ascribed to differences in surface roughness and chemical composition between the two types of HA substratum, and could have an influence on selection of future implant surface coatings.
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Affiliation(s)
- Ida E Svendsen
- Prosthetic Dentistry, Faculty of Odontology, Malmö University, Malmö, Sweden.
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11
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Santos O, Svendsen IE, Lindh L, Arnebrant T. Adsorption of HSA, IgG and laminin-1 on model titania surfaces--effects of glow discharge treatment on competitively adsorbed film composition. BIOFOULING 2011; 27:1003-1015. [PMID: 22004177 DOI: 10.1080/08927014.2011.622440] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This study investigated the effect of glow discharge treatment of titania surfaces on plasma protein adsorption, by means of ellipsometry and mechanically assisted SDS elution. The adsorption and film elution of three plasma proteins, viz. human serum albumin (HSA), human immunoglobulin G (IgG) and laminin-1, as well as competitive adsorption from a mixture of the three proteins, showed that the adsorbed amount of the individual proteins after 1 h increased in the order HSA <IgG <laminin-1 ≤ protein mixture. Film elutability showed that 30 min of SDS interaction resulted in almost complete removal of adsorbed films. No difference in the total adsorbed amounts of individual proteins, or from the mixture, was observed between untreated and glow discharge treated titania surfaces. However, the composition of the adsorbed films from the mixture differed between the untreated and glow discharge treated substrata. On glow discharge-treated titania the fraction of HSA increased, the fraction of laminin-1 decreased and the fraction of IgG was unchanged compared to the adsorption on the untreated titania, which was attributed to protein-protein interactions and competitive/associative adsorption behaviour.
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Affiliation(s)
- Olga Santos
- Biomedical Laboratory Science and Technology, Faculty of Health and Society, Malmö University, Malmö, Sweden.
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Gonçalves IC, Martins MCL, Barbosa JN, Oliveira P, Barbosa MA, Ratner BD. Platelet and leukocyte adhesion to albumin binding self-assembled monolayers. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:2053-2063. [PMID: 21755398 DOI: 10.1007/s10856-011-4381-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 06/14/2011] [Indexed: 05/31/2023]
Abstract
This study reports the use of tetraethylene glycol-terminated self-assembled monolayers (EG(4) SAMs) as a background non-fouling surface to study the effect of an 18 carbon ligand (C18) on albumin selective and reversible adsorption and subsequent platelet and leukocyte adhesion. Surface characterization techniques revealed an efficient immobilization of different levels of C18 ligand on EG(4) SAMs and an increase of surface thickness and hydrophobicity with the increase of C18 ligands. Albumin adsorption increased as the percentage of C18 ligands on the surface increased, but only 2.5%C18 SAMs adsorbed albumin in a selective and reversible way. Adherent platelets also increased with the amount of immobilized C18. Pre-immersion of samples in albumin before contact with platelets demonstrated an 80% decrease in platelet adhesion. Pre-immersion in plasma was only relevant for 2.5%C18 SAMs since this was the only surface to have less platelet adhesion compared to buffer pre-immersion. EG(4) SAMs adhered negligible amounts of leukocytes, but surfaces with C18 ligands have some adherent leukocytes. Except for 10%C18 SAMs, which increased leukocyte adhesion after albumin pre-adhesion, protein pre-immersion did not influence leukocyte adhesion. It has been shown that a surface with a specific surface concentration of albumin-binding ligands (2.5%C18 SAMs) can recruit albumin selectively and reversibly and minimize the adhesion of platelets, despite still adhering some leukocytes.
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Affiliation(s)
- Inês C Gonçalves
- INEB-Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal.
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Guha Thakurta S, Subramanian A. Evaluation of in situ albumin binding surfaces: a study of protein adsorption and platelet adhesion. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:137-149. [PMID: 21120589 DOI: 10.1007/s10856-010-4169-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Accepted: 10/07/2010] [Indexed: 05/30/2023]
Abstract
Surface modification strategies that take advantage of the passivation effects of albumin are important in the development of biomaterial surfaces. In this study, linear peptides (LP1, LP2) and a small chemical ligand (SCL) with albumin binding affinities were grafted onto silane functionalized silicon substrates. Surfaces were characterized with contact angle and ellipsometric measurements, and densities of immobilized ligands were assessed spectroscopically. Ellipsometrically measured thickness correlated with the predicted molecular lengths of grafted moieties. Contact angle analysis indicated that the LP1 and LP2 functionalized surfaces were hydrophilic compared to SCL functionalized and control surfaces. Adsorption of albumin from human serum was evaluated and quantified via specific enzyme-linked immunosorbent assays and 2D gel electrophoresis. The following trend was noted for surface adsorbed albumin: LP1 > LP2 > SCL > C, with LP1 derivatized surfaces having ~2.450 μg/cm(2) of bound albumin. LP1 derivatized surfaces possessed the least number of adsorbed platelets with rounded platelet morphology when compared to control surface.
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Affiliation(s)
- Sanjukta Guha Thakurta
- Department of Chemical and Biomolecular Engineering, University of Nebraska, Lincoln, NE 68588, USA
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Palacio MLB, Schricker SR, Bhushan B. Bioadhesion of various proteins on random, diblock and triblock copolymer surfaces and the effect of pH conditions. J R Soc Interface 2010; 8:630-40. [PMID: 21147831 DOI: 10.1098/rsif.2010.0557] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The adhesive interactions of block copolymers composed of poly(methyl methacrylate) (PMMA)/poly(acrylic acid) (PAA) and poly(methyl methacrylate)/poly(2-hydroxyethyl methacrylate) (PHEMA) with the proteins fibronectin, bovine serum albumin and collagen were studied by atomic force microscopy. Adhesion experiments were performed both at physiological pH and at a slightly more acidic condition (pH 6.2) to model polymer-protein interactions under inflammatory or infectious conditions. The PMMA/PAA block copolymers were found to be more sensitive to the buffer environment than PMMA/PHEMA owing to electrostatic interactions between the ionized acrylate groups and the proteins. It was found that random, diblock and triblock copolymers exhibit distinct adhesion profiles although their chemical compositions are identical. This implies that biomaterial nanomorphology can be used to control protein-polymer interactions and potentially cell adhesion.
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Affiliation(s)
- Manuel L B Palacio
- Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics, The Ohio State University, Columbus, OH 43210, USA
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Protein adsorption and clotting time of pHEMA hydrogels modified with C18 ligands to adsorb albumin selectively and reversibly. Biomaterials 2009; 30:5541-51. [DOI: 10.1016/j.biomaterials.2009.06.025] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 06/10/2009] [Indexed: 11/18/2022]
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Godek ML, Michel R, Chamberlain LM, Castner DG, Grainger DW. Adsorbed serum albumin is permissive to macrophage attachment to perfluorocarbon polymer surfaces in culture. J Biomed Mater Res A 2009; 88:503-19. [PMID: 18306309 DOI: 10.1002/jbm.a.31886] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Monocyte/macrophage adhesion to biomaterials, correlated with foreign body response, occurs through protein-mediated surface interactions. Albumin-selective perfluorocarbon (FC) biomaterials are generally poorly cell-conducive because of insufficient receptor-mediated surface interactions, but macrophages bind to albumin-coated substrates and also preferentially to highly hydrophobic fluorinated surfaces. Bone marrow macrophages (BMMO) and IC-21, RAW 264.7, and J774A.1 monocyte/macrophage cells were cultured on FC surfaces. Protein deposition onto two distinct FC surfaces from complex and single-component solutions was tracked using fluorescence and time-of-flight secondary ion mass spectrometry (ToF-SIMS) methods. Cell adhesion and growth on protein pretreated substrates were compared by light microscopy. Flow cytometry and integrin-directed antibody receptor blocking were used to assess integrins critical for monocyte/macrophage adhesion in vitro. Albumin predominantly adsorbs onto both FC surfaces from 10% serum. In cultures preadsorbed with albumin or serum-dilutions, BMMO responded similar to IC-21 at early time points. Compared with Teflon AF, plasma-polymerized FC was less permissive to extended cell proliferation. The beta(2) integrins play major roles in macrophage adhesion to FC surfaces: antibody blocking significantly disrupted cell adhesion. Albumin-mediated cell adhesion mechanisms to FC surfaces could not be clarified. Primary BMMO and secondary IC-21 macrophages behave similarly on FC surfaces, regardless of preadsorbed protein biasing, with respect to adhesion, cell morphology, motility, and proliferation.
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Affiliation(s)
- M L Godek
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, Colorado 80523, USA
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Matsuda T, Ohya S. Photoiniferter-based thermoresponsive graft architecture with albumin covalently fixed at growing graft chain end. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9660-5. [PMID: 16207050 DOI: 10.1021/la050221o] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The aim of this study was to develop a novel surface graft architecture in which albumin is covalently fixed at the growing chain end of the hydrophilic polymers: poly(N, N-dimethylacylamide), PDMAM, and poly(N-isopropylacrylamide), PNIPAM. Photoiniferter-based surface-grafted polymers were prepared using either an albuminated iniferter or a nonalbuminated iniferter, both of which were derivatized on glass surfaces, and ultraviolet (UV)-light-irradiated in the presence of a DMAM or NIPAM monomer. Surface chemical composition analysis by X-ray photoelectron spectroscopy, contact angle measurement, immunostaining using fluorescence labeled antibody and the measurement of graft thickness, as determined from force-distance curves obtained in water at 25 degrees C and 37 degrees C by atomic force microscopy, evidenced that the thickness of graft layer increased with photoirradiation time and albumin molecules exist at growing chain ends. For PNIPAM-grafted surfaces, the interconversion between swollen and collapsed graft chains was observed below and above the lower critical solution temperature of PNIPAM. The potential application of a thermoresponsive graft with albumin covalently fixed at its growing chain end was discussed in terms of "active" nonfouling surface design based on the temperature-dependent switching of phase transition.
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Affiliation(s)
- Takehisa Matsuda
- Division of Biomedical Engineering, Graduate School of Medicine, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
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Basinska T. Adsorption studies of human serum albumin, human gamma-globulins, and human fibrinogen on the surface of p(S/PGL) microspheres. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2003; 12:1359-71. [PMID: 11922480 DOI: 10.1163/156856202753419277] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Adsorption of human serum albumin (HSA), human gamma-globulins (gammaG), and human fibrinogen (Fb) onto the surface of poly(styrene/alpha-t-butoxy-omega-vinylbenzyl-polyglycidol) microspheres (P(S/PGL)) with controlled fraction of polyglycidol in the interfacial layer was investigated. The microspheres were synthesized by the emulsifier-free radical copolymerization of styrene and alpha-t-butoxy-omega-vinylbenzyl-polyglycidol macromonomer (PGL). Macromonomers with number average molecular weights Mn = 950 and 2,700 were used in the syntheses. Fraction of polyglycidol in the microsphere surface layer was varied from 0.22 to 0.44, depending on the composition of the monomer feed. It was found that the maximal surface concentration of adsorbed proteins and the equilibrium constant of protein adsorption decreased with increased fraction of polyglycidol in the microsphere surface layer. For microspheres with the highest fraction of polyglycidol at the surface the maximal surface protein concentration was c. ten times lower and the adsorption equilibrium constant was c. one hundred times lower than for the reference polystyrene microspheres. The dependence of maximal surface concentration of adsorbed proteins on the fraction of polyglycidol in the particle interfacial layer indicated random distribution of polyglycidol chains without formation of polyglycidol and polystyrene patches at the microspheres surface.
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Affiliation(s)
- T Basinska
- Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Lodz.
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McFarland CD, Thomas CH, DeFilippis C, Steele JG, Healy KE. Protein adsorption and cell attachment to patterned surfaces. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 49:200-10. [PMID: 10571906 DOI: 10.1002/(sici)1097-4636(200002)49:2<200::aid-jbm7>3.0.co;2-l] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
To better understand the events involved in the generation of defined tissue architectures on biomaterials, we have examined the mechanism of attachment of human bone-derived cells (HBDC) to surfaces with patterned surface chemistry in vitro. Photolithography was used to generate alternating domains of N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane (EDS) and dimethyldichlorosilane (DMS). At 90 min after seeding, HBDC were localized preferentially to the EDS regions of the pattern. Using sera specifically depleted of adhesive glycoproteins, this spatial organization was found to be mediated by adsorption of vitronectin (Vn) from serum onto the EDS domains. In contrast, fibronectin (Fn) was unable to adsorb in the face of competition from other serum components. These results were confirmed by immunostaining, which also revealed that both Vn and Fn were able to adsorb to EDS and DMS regions when coated from pure solution, i.e., in the absence of competition. In this situation, each protein was able to mediate cell adhesion across a range of surface densities. Cell spreading was constrained on the EDS domains, as indicated by cell morphology and the lack of integrin receptor clustering and focal adhesion formation. This spatial constraint may have implications for the subsequent expression of differentiated function.
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Affiliation(s)
- C D McFarland
- CSIRO Molecular Science, Sydney Laboratory, P.O. Box 184, North Ryde, NSW 1670, Australia
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