1
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Struczyńska M, Firkowska-Boden I, Scheuer K, Jandt KD. Rutile facet-dependent fibrinogen conformation: Why crystallographic orientation matters. Colloids Surf B Biointerfaces 2022; 215:112506. [PMID: 35487071 DOI: 10.1016/j.colsurfb.2022.112506] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 04/10/2022] [Accepted: 04/12/2022] [Indexed: 11/30/2022]
Abstract
Previous studies implied that single crystalline rutile surfaces have the ability to guide the functionality of adsorbed blood plasma proteins. However, a clear relation between the rutile crystallographic orientation and conformation of adsorbed proteins is still missing. Here, we examine the adsorption characteristics of human plasma fibrinogen (HPF) on atomically flat single rutile crystals with (110), (100), (101) and (001) facets. By direct visualization of individual protein molecules through atomic force microscopy (AFM) imaging, the distinct conformations of HPF were determined depending on rutile surface crystallographic orientation. In particular, dominant trinodular and globular conformation was found on (110) and (001) facets, respectively. The observed variations of HPF conformation were reasoned from the surface water contact angle and surface energy point of view. By analyzing AFM-based force measurements, statistically significant changes in surface energies of rutile surfaces covered with HPF were determined and linked to HPF conformation. Furthermore, the facet-dependent structural rearrangement of HPF was indirectly confirmed through deconvolution of high-resolution X-ray photoelectron spectroscopy (XPS) carbon and nitrogen spectra. The globular, and thus native-like HPF conformation observed on (001) facet, was reflected in the lowest level of amino group formation. We propose that the mechanism behind the crystallographic orientation-induced HPF conformation is driven by the facet-specific surface hydrophilicity and energy. From the biomedical material perspective, our results demonstrate that the conformation of HPF can be guided by controlling the crystallographic orientation of the underlying material surface. This might be beneficial to the field of titanium-based biomaterials design and development.
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Affiliation(s)
- Maja Struczyńska
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany
| | - Izabela Firkowska-Boden
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany.
| | - Karl Scheuer
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany
| | - Klaus D Jandt
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany; Jena School for Microbial Communication (JSMC), Neugasse 23, 07743 Jena, Germany.
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2
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Dubrovin EV, Klinov DV. Atomic Force Microscopy of Biopolymers on Graphite Surfaces. POLYMER SCIENCE SERIES A 2021. [DOI: 10.1134/s0965545x2106002x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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3
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Dubrovin EV, Klinov DV, Schäffer TE. Evidence of (anti)metamorphic properties of modified graphitic surfaces obtained in real time at a single-molecule level. Colloids Surf B Biointerfaces 2020; 193:111077. [DOI: 10.1016/j.colsurfb.2020.111077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/09/2020] [Accepted: 04/21/2020] [Indexed: 12/31/2022]
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4
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The crucial role of water in the formation of the physiological temperature range for warm-blooded organisms. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112818] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Imbir G, Mzyk A, Trembecka-Wójciga K, Jasek-Gajda E, Plutecka H, Schirhagl R, Major R. Polyelectrolyte Multilayer Films Modification with Ag and rGO Influences Platelets Activation and Aggregate Formation under In Vitro Blood Flow. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E859. [PMID: 32365586 PMCID: PMC7712484 DOI: 10.3390/nano10050859] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/15/2020] [Accepted: 04/27/2020] [Indexed: 01/25/2023]
Abstract
Surface functionalization of materials to improve their hemocompatibility is a challenging problem in the field of blood-contacting devices and implants. Polyelectrolyte multilayer films (PEMs), which can mimic functions and structure of an extracellular matrix (ECM), are a promising solution to the urgent need for functional blood-contacting coatings. The properties of PEMs can be easily tuned in order to provide a scaffold with desired physico-chemical parameters. In this study chitosan/chondroitin sulfate (Chi/CS) polyelectrolyte multilayers were deposited on medical polyurethane. Afterwards PEMs were modified by chemical cross-linking and nanoparticles introduction. Coatings with variable properties were tested for their hemocompatibility in the cone-plate tester under dynamic conditions. The obtained results enable the understanding of how substrate properties modulate PEMs interaction with blood plasma proteins and the morphotic elements.
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Affiliation(s)
- Gabriela Imbir
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland; (A.M.); (K.T.-W.); (R.M.)
| | - Aldona Mzyk
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland; (A.M.); (K.T.-W.); (R.M.)
- Department of Biomedical Engineering, University Medical Center Groningen, Antonius Deusinglaan 1, 9713AV Groningen, The Netherlands;
| | - Klaudia Trembecka-Wójciga
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland; (A.M.); (K.T.-W.); (R.M.)
| | - Ewa Jasek-Gajda
- Department of Histology, Jagiellonian University Medical College, 7a Kopernika Street, 31-034 Krakow, Poland;
| | - Hanna Plutecka
- Department of Medicine, Jagiellonian University Medical College, 8 Skawinska Street, 31-066 Krakow, Poland;
| | - Romana Schirhagl
- Department of Biomedical Engineering, University Medical Center Groningen, Antonius Deusinglaan 1, 9713AV Groningen, The Netherlands;
| | - Roman Major
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland; (A.M.); (K.T.-W.); (R.M.)
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6
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Hanson SR, Tucker EI, Latour RA. Blood Coagulation and Blood–Material Interactions. Biomater Sci 2020. [DOI: 10.1016/b978-0-12-816137-1.00052-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Dubrovin EV, Barinov NA, Schäffer TE, Klinov DV. In Situ Single-Molecule AFM Investigation of Surface-Induced Fibrinogen Unfolding on Graphite. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9732-9739. [PMID: 31282164 DOI: 10.1021/acs.langmuir.9b01178] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fibrinogen adsorption plays a key role in important biological processes, such as blood coagulation and foreign body reaction, which determine the biocompatibility of a material. Fibrinogen conformation on a surface is one of the main factors triggering these processes. Understanding the conformational dynamics of fibrinogen molecules adsorbed on solid surfaces is, therefore, of great interest in biomedicine and may contribute to the development of new biomaterials. In this work, unfolding of fibrinogen molecules adsorbed on a model surface (highly oriented pyrolytic graphite modified with an oligoglycine-hydrocarbon graphite modifier) is directly visualized using time-lapse atomic force microscopy. A gradual transformation of native-like fibrinogen molecules into fibrillar structures is observed at a timescale of several minutes. This transformation is accompanied by a decrease in molecular height from 4-5 to 1-2 nm. Independent unfolding of different fibrinogen domains is demonstrated. The obtained results provide a new, direct insight into the unfolding of individual fibrinogen molecules on a surface and give new opportunities for the development of graphite-based biosensors and biomaterials.
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Affiliation(s)
- Evgeniy V Dubrovin
- Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency , Malaya Pirogovskaya, 1a , Moscow 119435 , Russian Federation
- Institute of Applied Physics , University of Tübingen , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
- Faculty of Physics , Lomonosov Moscow State University , Leninskie Gory, 1/2 , 119991 Moscow , Russian Federation
| | - Nikolay A Barinov
- Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency , Malaya Pirogovskaya, 1a , Moscow 119435 , Russian Federation
| | - Tilman E Schäffer
- Institute of Applied Physics , University of Tübingen , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Dmitry V Klinov
- Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency , Malaya Pirogovskaya, 1a , Moscow 119435 , Russian Federation
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8
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Ge A, Qiao L, Seo JH, Yui N, Ye S. Surface-Restructuring Differences between Polyrotaxanes and Random Copolymers in Aqueous Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12463-12470. [PMID: 30216076 DOI: 10.1021/acs.langmuir.8b02676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In the present study, we investigated the surface reorganization behaviors and adsorption conformations of fibrinogen on the surface of polyrotaxanes containing different amounts of α-cyclodextrin (α-CD) by using surface-sensitive vibrational spectroscopy sum frequency generation (SFG). For comparison, behaviors of the surface restructuring and fibrinogen adsorption on the random copolymers containing similar terminal groups were also investigated. It was found that larger amounts of BMA moieties of polyrotaxanes form ordered surface structures after immersion in water for 48 h. Furthermore, the polyrotaxane surfaces exhibit a much higher capability of fibrinogen adsorption than the random copolymer surfaces. The water-induced surface restructuring of the polyrotaxane films slightly affects the adsorption structure of the fibrinogen molecules.
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Affiliation(s)
- Aimin Ge
- Institute for Catalysis , Hokkaido University , Sapporo 001-0021 , Japan
| | - Lin Qiao
- Institute for Catalysis , Hokkaido University , Sapporo 001-0021 , Japan
| | - Ji-Hun Seo
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , Tokyo 101-0062 , Japan
| | - Nobuhiko Yui
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , Tokyo 101-0062 , Japan
| | - Shen Ye
- Department of Chemistry, Graduate School of Science , Tohoku University , Sendai 980-8578 , Japan
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9
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Horbett TA. Fibrinogen adsorption to biomaterials. J Biomed Mater Res A 2018; 106:2777-2788. [PMID: 29896846 DOI: 10.1002/jbm.a.36460] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 05/16/2018] [Indexed: 01/28/2023]
Abstract
Fibrinogen (Fg) adsorption is an important mechanism underlying cell adhesion to biomaterials and was the major focus of the author's research career. This article summarizes our work on Fg adsorption, with citations of related work as appropriate. The molecular properties of Fg that promote adsorption and cell adhesion will be described. In addition, the adsorption behavior of Fg from buffer, binary solutions with other proteins, and blood plasma will be discussed, including the Vroman effect. Studies of platelet adhesion to surfaces preadsorbed with blood plasmas selectively deficient in Fg, vitronectin (Vn), fibronectin (Fn), or von Willebrand's factor (vWf) will be reviewed. These studies clearly showed a major role for Fg in platelet adhesion under static conditions and both Fg and vWf for adhesion from flowing suspensions, but no significant role for Vn or Fn. However, it was also shown that platelet adhesion was poorly correlated with the total amount of adsorbed Fg, but very well correlated with the binding of antibodies specific to the cell binding domains of Fg. A brief overview of nonfouling surfaces for prevention of Fg adsorption will be given. A more extensive discussion of structural changes in Fg after its adsorption is included, including changes detected with both physicochemical and biological methods. A short discussion of the state of the art of structural determination of adsorbed proteins with computational methods is also given. A final section identifies Fg adsorption as the single most important event determining the biocompatibility of implants in soft tissue and in blood. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2777-2788, 2018.
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Affiliation(s)
- Thomas A Horbett
- Departments of Bioengineering and Chemical Engineering, University of Washington, Seattle, Washington 98195
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10
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Barinov NA, Protopopova AD, Dubrovin EV, Klinov DV. Thermal denaturation of fibrinogen visualized by single-molecule atomic force microscopy. Colloids Surf B Biointerfaces 2018; 167:370-376. [DOI: 10.1016/j.colsurfb.2018.04.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 04/08/2018] [Accepted: 04/17/2018] [Indexed: 01/27/2023]
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11
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Kozai T, Sekiguchi T, Satoh T, Yagi H, Kato K, Uchihashi T. Two-step process for disassembly mechanism of proteasome α7 homo-tetradecamer by α6 revealed by high-speed atomic force microscopy. Sci Rep 2017; 7:15373. [PMID: 29133893 PMCID: PMC5684232 DOI: 10.1038/s41598-017-15708-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 10/31/2017] [Indexed: 01/06/2023] Open
Abstract
The 20S proteasome is a core particle of the eukaryotic proteasome responsible for proteolysis and is composed of layered α and β hetero-heptameric rings. The α7 subunit, which is one of components of the α ring, is known to self-assemble into a double-ringed homo-tetradecamer composed of two layers of the α7 heptameric ring. The α7 tetradecamer is known to disassemble upon the addition of α6 subunit, producing a 1:7 hetero-octameric α6-α7 complex. However, the detailed disassembly mechanism remains unclear. Here, we applied high-speed atomic force microscopy (HS-AFM) to dissect the disassembly process of the α7 double ring caused by interaction with the α6. HS-AFM movies clearly demonstrated two different modes of interaction in which the α6 monomer initially cracks at the interface between the stacked two α7 single rings and the subsequent intercalation of the α6 monomer in the open pore of the α7 single ring blocks the re-association of the single rings into the double ring. This result provides a mechanistic insight about the disassembly process of non-native homo-oligomers formed by proteasome components which is crucial for the initial process for assembly of 20S proteasome.
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Affiliation(s)
- Toshiya Kozai
- College of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan
| | - Taichiro Sekiguchi
- Faculty and Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi, 467-8603, Japan
| | - Tadashi Satoh
- Faculty and Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi, 467-8603, Japan
| | - Hirokazu Yagi
- Faculty and Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi, 467-8603, Japan
| | - Koichi Kato
- Faculty and Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi, 467-8603, Japan. .,Okazaki Institute for Integrative Bioscience and Institute for Molecular Science, National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan.
| | - Takayuki Uchihashi
- Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8602, Japan. .,CREST, JST (Japan Science and Technology), Kawaguchi, Saitama, 332-0012, Japan.
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12
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Dubrovin EV, Schächtele M, Klinov DV, Schäffer TE. Time-Lapse Single-Biomolecule Atomic Force Microscopy Investigation on Modified Graphite in Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10027-10034. [PMID: 28850785 DOI: 10.1021/acs.langmuir.7b02220] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Atomic force microscopy (AFM) of biomolecular processes at the single-molecule level can provide unique information for understanding molecular function. In AFM studies of biomolecular processes in solution, mica surfaces are predominantly used as substrates. However, owing to its high surface charge, mica may induce high local ionic strength in the vicinity of its surface, which may shift the equilibrium of studied biomolecular processes such as biopolymer adsorption or protein-DNA interaction. In the search for alternative substrates, we have investigated the behavior of adsorbed biomolecules, such as plasmid DNA and E. coli RNA polymerase σ70 subunit holoenzyme (RNAP), on highly oriented pyrolytic graphite (HOPG) surfaces modified with stearylamine and oligoglycine-hydrocarbon derivative (GM) monolayers using AFM in solution. We have demonstrated ionic-strength-dependent DNA mobility on GM HOPG and nativelike dimensions of RNAP molecules adsorbed on modified HOPG surfaces. We propose an approach to the real-time AFM investigation of transcription on stearylamine monolayers on graphite. We conclude that modified graphite allows us to study biomolecules and biomolecular processes on its surface at controlled ionic strength and may be used as a complement to mica in AFM investigations.
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Affiliation(s)
- Evgeniy V Dubrovin
- University of Tübingen , Institute of Applied Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
- Federal Research and Clinical Center of Physical-Chemical Medicine , Malaya Pirogovskaya 1a, Moscow 119435, Russian Federation
- Lomonosov Moscow State University , Leninskie gory 1-2, Moscow 119991, Russian Federation
| | - Marc Schächtele
- University of Tübingen , Institute of Applied Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Dmitry V Klinov
- Federal Research and Clinical Center of Physical-Chemical Medicine , Malaya Pirogovskaya 1a, Moscow 119435, Russian Federation
| | - Tilman E Schäffer
- University of Tübingen , Institute of Applied Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
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13
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Venault A, Subarja A, Chang Y. Zwitterionic Polyhydroxybutyrate Electrospun Fibrous Membranes with a Compromise of Bioinert Control and Tissue-Cell Growth. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2460-2471. [PMID: 28177247 DOI: 10.1021/acs.langmuir.6b04683] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a method for surface modification by thermal-evaporation self-assembling of poly(3-hydroxybutyrate) (PHB) fibrous membranes with a copolymer of hydrophobic octadecyl acrylate repeat units and hydrophilic zwitterionic 4-vinylpyridine blocks, zP(4VP-r-ODA), in view of controlling biofoulant-fiber interactions. PHB is of interest as a material for bioscaffolding, but its disadvantage is its hydrophobicity, which leads to unwanted interactions with proteins, blood cells, or bacteria. Surface modification of electrospun PHB fibers addresses this issue because the hydrophilicity of the membranes is improved, leading to a significant reduction in bovine serum albumin (92%), lysozyme (73%), and fibrinogen (50%) adsorption. From a coating density of 0.78 mg/cm2, no bacteria interacted with the fibers, and from 1.13 mg/cm2, excellent hemocompatibility of membranes was measured from thrombocytes, erythrocytes, leukocytes, and whole blood attachment tests. Additionally, HT-1080 fibroblasts were observed to develop in contact with the fibers after 3-7 days of incubation (cell density up to 329 ± 16 cells/mm2), suggesting that zP(4VP-r-ODA) provides an adequate humid environment for their growth. Providing an effective control of the surface chemistry and of the coating density, the association of PHB and zP(4VP-r-ODA) can promote the growth of fibroblasts, still maintaining resistance to unwanted biofoulants, and appears to be a promising composite material for tissue engineering.
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Affiliation(s)
- Antoine Venault
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University , Jhong-Li, Taoyuan 320, Taiwan
| | - Andre Subarja
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University , Jhong-Li, Taoyuan 320, Taiwan
| | - Yung Chang
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University , Jhong-Li, Taoyuan 320, Taiwan
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14
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AFM visualization at a single-molecule level of denaturated states of proteins on graphite. Colloids Surf B Biointerfaces 2016; 146:777-84. [DOI: 10.1016/j.colsurfb.2016.07.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 06/29/2016] [Accepted: 07/04/2016] [Indexed: 11/21/2022]
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15
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Dragneva N, Rubel O, Floriano WB. Molecular Dynamics of Fibrinogen Adsorption onto Graphene, but Not onto Poly(ethylene glycol) Surface, Increases Exposure of Recognition Sites That Trigger Immune Response. J Chem Inf Model 2016; 56:706-20. [DOI: 10.1021/acs.jcim.5b00703] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Nadiya Dragneva
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Biotechnology
Ph.D. Program, Faculty of Science and Environment Studies, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
| | - Oleg Rubel
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Department
of Materials Science and Engineering, McMaster University, 1280 Main
Street West, Hamilton, Ontario L8S 4L8, Canada
| | - Wely B. Floriano
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Biotechnology
Ph.D. Program, Faculty of Science and Environment Studies, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
- Department
of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
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16
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de los Santos Pereira A, Sheikh S, Blaszykowski C, Pop-Georgievski O, Fedorov K, Thompson M, Rodriguez-Emmenegger C. Antifouling Polymer Brushes Displaying Antithrombogenic Surface Properties. Biomacromolecules 2016; 17:1179-85. [DOI: 10.1021/acs.biomac.6b00019] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Andres de los Santos Pereira
- Department
of Chemistry and Physics of Surfaces and Biointerfaces, Institute
of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovsky Square 2, 162 06 Prague, Czech Republic
| | - Sonia Sheikh
- Department
of Chemistry − St. George Campus, University of Toronto, 80 St. George Street, Toronto, Ontario Canada M5S 3H6
| | | | - Ognen Pop-Georgievski
- Department
of Chemistry and Physics of Surfaces and Biointerfaces, Institute
of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovsky Square 2, 162 06 Prague, Czech Republic
| | - Kiril Fedorov
- Institute of Biomaterials & Biomedical Engineering, 164 College Street, University of Toronto, Toronto, Ontario Canada M5S 3G9
| | - Michael Thompson
- Department
of Chemistry − St. George Campus, University of Toronto, 80 St. George Street, Toronto, Ontario Canada M5S 3H6
| | - Cesar Rodriguez-Emmenegger
- Department
of Chemistry and Physics of Surfaces and Biointerfaces, Institute
of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovsky Square 2, 162 06 Prague, Czech Republic
- DWI
− Leibniz Institute for Interactive Materials and Institute
of Technical and Macromolecular Chemistry, RWTH Aachen University, Forckenbeckstraße 50, 52074 Aachen, Germany
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17
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Peng Y, Yang C, Zheng Y. Extracting conformational information from single molecule photon statistics. J Chem Phys 2016; 144:064306. [PMID: 26874487 DOI: 10.1063/1.4941325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this paper, we describe the approach of resonant trajectories of photon emission (Traj〈N〉 and TrajQ) in the conformational coordinate X and external field frequency ωL space to extract the conformational information of single molecule. The Smoluchowski equation is employed to describe the conformational dynamics of the single molecule in complex environments. This approach is applied to single Thioflavin T (ThT) molecule, and our results are in excellent agreement with the results of ab initio simulations.
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Affiliation(s)
- Yonggang Peng
- School of Physics, Shandong University, Jinan 250100, China
| | - Chuanlu Yang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China
| | - Yujun Zheng
- School of Physics, Shandong University, Jinan 250100, China
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18
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Cai Y, Li H, Karlsson M, Leifer K, Engqvist H, Xia W. Biomineralization on single crystalline rutile: the modulated growth of hydroxyapatite by fibronectin in a simulated body fluid. RSC Adv 2016. [DOI: 10.1039/c6ra04303h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The aim of this study is to probe the complex interaction between surface bioactivity and protein adsorption on single crystalline rutile.
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Affiliation(s)
- Yixiao Cai
- Applied Materials Science
- Department of Engineering Sciences
- Ångström Laboratory
- Uppsala University
- Uppsala
| | - Hu Li
- Applied Materials Science
- Department of Engineering Sciences
- Ångström Laboratory
- Uppsala University
- Uppsala
| | - Mikael Karlsson
- Applied Materials Science
- Department of Engineering Sciences
- Ångström Laboratory
- Uppsala University
- Uppsala
| | - Klaus Leifer
- Applied Materials Science
- Department of Engineering Sciences
- Ångström Laboratory
- Uppsala University
- Uppsala
| | - Håkan Engqvist
- Applied Materials Science
- Department of Engineering Sciences
- Ångström Laboratory
- Uppsala University
- Uppsala
| | - Wei Xia
- Applied Materials Science
- Department of Engineering Sciences
- Ångström Laboratory
- Uppsala University
- Uppsala
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19
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Köhler S, Schmid F, Settanni G. Molecular Dynamics Simulations of the Initial Adsorption Stages of Fibrinogen on Mica and Graphite Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13180-90. [PMID: 26569042 DOI: 10.1021/acs.langmuir.5b03371] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Fibrinogen, a blood glycoprotein of vertebrates, plays an essential role in blood clotting by polymerizing into fibrin when activated. Upon adsorption on material surfaces, it also contributes to determine their biocompatibility and has been implicated in the onset of thrombosis and inflammation at medical implants. Here we present the first fully atomistic simulations of the initial stages of the adsorption process of fibrinogen on mica and graphite surfaces. The simulations reveal a weak adsorption on mica that allows frequent desorption and reorientation events. This adsorption is driven by electrostatic interactions between the protein and the silicate surface as well as the counterion layer. Preferred adsorption orientations for the globular regions of the protein are identified. The adsorption on graphite is found to be stronger with fewer reorientation and desorption events and shows the onset of denaturation of the protein.
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Affiliation(s)
- Stephan Köhler
- Institut für Physik, ‡Graduate School Materials Science in Mainz, and §Max Planck Graduate Center, Johannes Gutenberg-Universität , Mainz 55099, Germany
| | - Friederike Schmid
- Institut für Physik, ‡Graduate School Materials Science in Mainz, and §Max Planck Graduate Center, Johannes Gutenberg-Universität , Mainz 55099, Germany
| | - Giovanni Settanni
- Institut für Physik, ‡Graduate School Materials Science in Mainz, and §Max Planck Graduate Center, Johannes Gutenberg-Universität , Mainz 55099, Germany
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20
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Ge A, Seo JH, Qiao L, Yui N, Ye S. Structural Reorganization and Fibrinogen Adsorption Behaviors on the Polyrotaxane Surfaces Investigated by Sum Frequency Generation Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22709-22718. [PMID: 26393413 DOI: 10.1021/acsami.5b07760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Polyrotaxanes, such as supramolecular assemblies with methylated α-cyclodextrins (α-CDs) as host molecules noncovalently threaded on the linear polymer backbone, are promising materials for biomedical applications because they allow adsorbed proteins possessing a high surface flexibility as well as control of the cellular morphology and adhesion. To provide a general design principle for biomedical materials, we examined the surface reorganization behaviors and adsorption conformations of fibrinogen on the polyrotaxane surfaces with comparison to several random copolymers by sum frequency generation (SFG) vibrational spectroscopy. We showed that the polyrotaxane (OMe-PRX-PMB) with methylated α-CDs as the host molecule exhibited unique surface structures in an aqueous environment. The hydrophobic interaction between the methoxy groups of the methylated α-CD molecules and methyl groups of the n-butyl methacrylate (BMA) side chains may dominate the surface restructuring behavior of the OMe-PRX-PMB. The orientation analysis revealed that the orientation of the fibrinogen adsorbed on the OMe-PRX-PMB surface is close to a single distribution, which is different from the adsorption behaviors of fibrinogen on other polyrotaxane or random copolymer surfaces.
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Affiliation(s)
- Aimin Ge
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| | - Ji-Hun Seo
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University , Tokyo 101-0062, Japan
| | - Lin Qiao
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| | - Nobuhiko Yui
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University , Tokyo 101-0062, Japan
| | - Shen Ye
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
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21
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Protopopova AD, Barinov NA, Zavyalova EG, Kopylov AM, Sergienko VI, Klinov DV. Visualization of fibrinogen αC regions and their arrangement during fibrin network formation by high-resolution AFM. J Thromb Haemost 2015; 13:570-9. [PMID: 25393591 DOI: 10.1111/jth.12785] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 11/09/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Fibrinogen has been intensively studied with transmission electron microscopy and x-ray diffraction. But until now, a complete 3D structure of the molecule has not yet been available because the two highly flexible αC regions could not be resolved in fibrinogen crystals. This study was aimed at determining whether the αC regions can be visualized by high-resolution atomic force microscopy. METHODS Atomic force microscopy with super high resolution was used to image single molecules of fibrinogen and fibrin associates. The key approach was to use a graphite surface modified with the monolayer of amphiphilic carbohydrate-glycine molecules and unique supersharp cantilevers with 1 nm tip diameter. RESULTS Fibrinogen αC regions were visualized along with the complete domain structure of the protein. In almost all molecules at pH 7.4 the D domain regions had one or two protrusions of average height 0.4 ± 0.1 nm and length 21 ± 6 nm. The complex, formed between thrombin and fibrinogen, was also visualized. Images of growing fibrin fibers with clearly visible αC regions have been obtained. CONCLUSIONS Fibrin αC regions were visible in protofibrils and large fibers; αC regions intertwined near a branchpoint and looked like a zipper. These results support the idea that αC regions are involved in the thickening of fibrin fibers. In addition, new details were revealed about the behavior of individual fibrin molecules during formation of the fibrin network. Under the diluted condition, the positioning of the αC regions could suggest their involvement in long-range interactions between fibrin but not fibrinogen molecules.
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Affiliation(s)
- A D Protopopova
- Scientific Research Institute of Physical-Chemical Medicine, Moscow, Russia
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22
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Venault A, Ballad MRB, Liu YH, Aimar P, Chang Y. Hemocompatibility of PVDF/PS-b-PEGMA membranes prepared by LIPS process. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2014.12.024] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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23
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Wu HX, Tan L, Yang MY, Liu CJ, Zhuo RX. Protein-resistance performance of amphiphilic copolymer brushes consisting of fluorinated polymers and polyacrylamide grafted from silicon surfaces. RSC Adv 2015. [DOI: 10.1039/c4ra16036c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
A series of random copolymer brushes of acrylamide (AM) and 2-(perfluorinated hexyl)ethyl methacrylate (FMA) were grafted from initiator-functionalized silicon wafers by surface-initiated atom transfer radical polymerization.
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Affiliation(s)
- Hai-Xia Wu
- Key Laboratory of Biomedical Polymers of Ministry of Education
- College of Chemistry and Molecular Science
- Wuhan University
- Wuhan
- P. R. China
| | - Lei Tan
- Key Laboratory of Biomedical Polymers of Ministry of Education
- College of Chemistry and Molecular Science
- Wuhan University
- Wuhan
- P. R. China
| | - Mei-Yan Yang
- Key Laboratory of Biomedical Polymers of Ministry of Education
- College of Chemistry and Molecular Science
- Wuhan University
- Wuhan
- P. R. China
| | - Chuan-Jun Liu
- Key Laboratory of Biomedical Polymers of Ministry of Education
- College of Chemistry and Molecular Science
- Wuhan University
- Wuhan
- P. R. China
| | - Ren-Xi Zhuo
- Key Laboratory of Biomedical Polymers of Ministry of Education
- College of Chemistry and Molecular Science
- Wuhan University
- Wuhan
- P. R. China
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24
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Xu LC, Bauer JW, Siedlecki CA. Proteins, platelets, and blood coagulation at biomaterial interfaces. Colloids Surf B Biointerfaces 2014; 124:49-68. [PMID: 25448722 PMCID: PMC5001692 DOI: 10.1016/j.colsurfb.2014.09.040] [Citation(s) in RCA: 248] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/15/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022]
Abstract
Blood coagulation and platelet adhesion remain major impediments to the use of biomaterials in implantable medical devices. There is still significant controversy and question in the field regarding the role that surfaces play in this process. This manuscript addresses this topic area and reports on state of the art in the field. Particular emphasis is placed on the subject of surface engineering and surface measurements that allow for control and observation of surface-mediated biological responses in blood and test solutions. Appropriate use of surface texturing and chemical patterning methodologies allow for reduction of both blood coagulation and platelet adhesion, and new methods of surface interrogation at high resolution allow for measurement of the relevant biological factors.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - James W Bauer
- Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Christopher A Siedlecki
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States; Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States.
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25
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Portugal CA, Truckenmüller R, Stamatialis D, Crespo JG. Effect of tissue scaffold topography on protein structure monitored by fluorescence spectroscopy. J Biotechnol 2014; 189:166-74. [DOI: 10.1016/j.jbiotec.2014.09.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 08/07/2014] [Accepted: 09/08/2014] [Indexed: 12/28/2022]
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26
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Butruk-Raszeja B, Trzaskowski M, Ciach T. Cell membrane-mimicking coating for blood-contacting polyurethanes. J Biomater Appl 2014; 29:801-12. [DOI: 10.1177/0885328214549611] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The aim of the present work was to develop simple modification technique for polyurethanes (PUs) intended for use in blood-contacting implants (vascular grafts, heart prosthesis, ventricular assist devices). PU surface was modified with soybean-derived phosphatidylcholine (PC) via one-step dip coating technique. In order to evaluate blood compatibility of the obtained materials, samples were contacted with human blood under static and arterial flow-simulated conditions. The PC-modified surfaces were thoroughly characterized and tested for fibrinogen resistance, the ability to resist platelet adhesion and activation, hemolysis percentage and plasma recalcification time. Results demonstrated significant, more than three-fold reduction in the amount of fibrinogen adsorbed to PC-modified materials as compared to non-modified PU. Analysis of the samples’ surface after incubation with blood showed high reduction in platelet adhesion. The results were confirmed by analysis of blood samples collected after shear-stress tests – the percentage of free (non-aggregated) platelets remaining in blood samples contacted with PC-coated materials exceeded 70%. The same parameter measured for non-modified PU was significantly lower and equaled 28%.
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Affiliation(s)
- Beata Butruk-Raszeja
- Laboratory of Biomedical Engineering, Faculty of Chemical and Process Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Maciej Trzaskowski
- Laboratory of Biomedical Engineering, Faculty of Chemical and Process Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Tomasz Ciach
- Laboratory of Biomedical Engineering, Faculty of Chemical and Process Engineering, Warsaw University of Technology, Warsaw, Poland
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27
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Felgueiras HP, Sommerfeld SD, Murthy NS, Kohn J, Migonney V. Poly(NaSS) functionalization modulates the conformation of fibronectin and collagen type I to enhance osteoblastic cell attachment onto Ti6Al4V. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9477-83. [PMID: 25054428 PMCID: PMC7025813 DOI: 10.1021/la501862f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Functionalization of surfaces with poly(sodium styrenesulfonate) (poly(NaSS)) has recently been found to enhance osteointegration of implantable materials. Radical polymerization of poly(NaSS) on titanium (Ti)-based substrates has been used to improve their long-term performance by preventing fibrosis and consequently implant loosening. However, the influence of the sulfonate groups on the early cell behavior and the associated molecular phenomena remains to be understood. In this work, we used quartz crystal microbalance with dissipation (QCM-D) to elucidate the role of poly(NaSS) in enhancing osteoblastic cell attachment. This was measured by following the cell attachment using the MC3T3-E1 cell line, on fetal bovine serum (FBS) preadsorbed surfaces and on substrates adsorbed with a series of relevant proteins, bovine serum albumin (BSA), fibronectin (Fn), and collagen type I (Col I). Comparison of the performance of poly(NaSS) with other clinically important substrates such as Ti alloy Ti6Al4V, gold, and poly(desamino-tyrosyl-tyrosine ethyl ester carbonate) (poly(DTEc)) indicates poly(NaSS) to be a superior substrate for MC3T3-E1 cells attachment. This attachment was found to be integrin mediated in the presence of Fn and Col I. Antibodies specific to the RGD peptide and the N- and C-terminal HB-binding domains reacted more intensively with Fn adsorbed on poly(NaSS). Fn adapts a conformation favorable to RGD mediated cell attachment when adsorbed onto poly(NaSS).
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Affiliation(s)
- Helena P. Felgueiras
- Laboratory of Biomaterials and Specialty Polymers, LBPS-CSPBAT CNRS UMR 7244, Institut Galilée, Université Paris 13, 93430 Villetaneuse, France
| | - Sven D. Sommerfeld
- New Jersey Center for Biomaterials, Rutgers University, 145 Bevier Road, Piscataway, New Jersey 08854, United States
| | - N. Sanjeeva Murthy
- New Jersey Center for Biomaterials, Rutgers University, 145 Bevier Road, Piscataway, New Jersey 08854, United States
| | - Joachim Kohn
- New Jersey Center for Biomaterials, Rutgers University, 145 Bevier Road, Piscataway, New Jersey 08854, United States
| | - Véronique Migonney
- Laboratory of Biomaterials and Specialty Polymers, LBPS-CSPBAT CNRS UMR 7244, Institut Galilée, Université Paris 13, 93430 Villetaneuse, France
- Corresponding Author:; Fax (+33) 01 49 40 20 36 (V.M.)
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28
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Vukosavljevic D, Hutter JL, Helmerhorst EJ, Xiao Y, Custodio W, Zaidan FC, Oppenheim FG, Siqueira WL. Nanoscale adhesion forces between enamel pellicle proteins and hydroxyapatite. J Dent Res 2014; 93:514-9. [PMID: 24591293 DOI: 10.1177/0022034514526599] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The acquired enamel pellicle (AEP) is important for minimizing the abrasion caused by parafunctional conditions as they occur, for instance, during bruxism. It is a remarkable feature of the AEP that a protein/peptide film can provide enough protection in normofunction to prevent teeth from abrasion and wear. Despite its obvious critical role in the protection of tooth surfaces, the essential adhesion features of AEP proteins on the enamel surface are poorly characterized. The objective of this study was to measure the adhesion force between histatin 5, a primary AEP component, and hydroxyapatite (HA) surfaces. Both biotinylated histatin 5 and biotinylated human serum albumin were allowed to adsorb to streptavidin-coated silica microspheres attached to atomic force microscope (AFM) cantilevers. A multimode AFM with a Nanoscope IIIa controller was used to measure the adhesion force between protein-functionalized silica microspheres attached to cantilever tips and the HA surface. The imaging was performed in tapping mode with a Si3N4 AFM cantilever, while the adhesion forces were measured in AFM contact mode. A collection of force-distance curves (~3,000/replicate) was obtained to generate histograms from which the adhesion forces between histatin 5 or albumin and the HA surface were measured. We found that histatin 5 exhibited stronger adhesion forces (90% >1.830 nN) to the HA surface than did albumin (90% > 0.282 nN). This study presents an objective approach to adhesion force measurements between histatin 5 and HA, and provides the experimental basis for measuring the same parameters for other AEP constituents. Such knowledge will help in the design of synthetic proteins and peptides with preventive and therapeutic benefits for tooth enamel.
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Affiliation(s)
- D Vukosavljevic
- Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON N5A 6C1, Canada
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29
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Dual drug encapsulated thermo-sensitive fibrinogen-graft-poly (N-isopropyl acrylamide) nanogels for breast cancer therapy. Colloids Surf B Biointerfaces 2014; 114:209-17. [DOI: 10.1016/j.colsurfb.2013.10.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 10/02/2013] [Accepted: 10/10/2013] [Indexed: 11/21/2022]
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30
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Zhang Z, Wu T, Wang Q, Pan H, Tang R. Impact of interfacial high-density water layer on accurate estimation of adsorption free energy by Jarzynski's equality. J Chem Phys 2014; 140:034706. [DOI: 10.1063/1.4858428] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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31
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Zhao Z, Ni H, Han Z, Jiang T, Xu Y, Lu X, Ye P. Effect of surface compositional heterogeneities and microphase segregation of fluorinated amphiphilic copolymers on antifouling performance. ACS APPLIED MATERIALS & INTERFACES 2013; 5:7808-7818. [PMID: 23919520 DOI: 10.1021/am401568b] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this paper, a series of fluorinated amphiphilic copolymers composed of 2-perfluorooctylethyl methacrylate (FMA) and 2-hydroxyethyl methacrylate (HEMA) monomers were prepared, and their surface properties and antifouling performance were investigated. Bovine serum albumin (BSA) and human plasma fibrinogen (HFg) were used as model proteins to study protein adsorption onto the fluorinated amphiphilic surfaces. All the fluorinated amphiphilic surfaces exhibit excellent resistant performance of protein adsorption measured by X-ray photoelectron spectroscopy (XPS). The surface compositional heterogeneities on the molecular scale play an important role in the antifouling properties. It was found that the copolymers exhibited better antifouling properties than the corresponding homopolymers did, when the percentage of hydrophilic hydroxyl groups is from 4% to 7% and the percentage of hydrophobic fluorinated moieties is from 4% to 14% on the surface. In addition, the protein molecular size scale and the pattern of microphase segregation domains on the surface strongly affect the protein adsorption behaviors. These results demonstrate the desirable protein-resistant performance from the fluorinated amphiphilic copolymers and provide deeper insight of the effect of surface compositional heterogeneity and microphase segregation on the protein adsorption behaviors.
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Affiliation(s)
- Zeliang Zhao
- Department of Chemistry, Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry, Zhejiang Sci-Tech University, Hangzhou 310018, China
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32
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Englade-Franklin LE, Saner CK, Garno JC. Spatially selective surface platforms for binding fibrinogen prepared by particle lithography with organosilanes. Interface Focus 2013; 3:20120102. [PMID: 24427541 PMCID: PMC3638418 DOI: 10.1098/rsfs.2012.0102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We introduce an approach based on particle lithography to prepare spatially selective surface platforms of organosilanes that are suitable for nanoscale studies of protein binding. Particle lithography was applied for patterning fibrinogen, a plasma protein that has a major role in the clotting cascade for blood coagulation and wound healing. Surface nanopatterns of mercaptosilanes were designed as sites for the attachment of fibrinogen within a protein-resistant matrix of 2-[methoxy(polyethyleneoxy)propyl] trichlorosilane (PEG-silane). Preparing site-selective surfaces was problematic in our studies, because of the self-reactive properties of PEG-organosilanes. Certain organosilanes presenting hydroxyl head groups will cross react to form mixed surface multi-layers. We developed a clever strategy with particle lithography using masks of silica mesospheres to protect small, discrete regions of the surface from cross reactions. Images acquired with atomic force microscopy (AFM) disclose that fibrinogen attached primarily to the surface areas presenting thiol head groups, which were surrounded by PEG-silane. The activity for binding anti-fibrinogen was further evaluated using ex situ AFM studies, confirming that after immobilization the fibrinogen nanopatterns retained capacity for binding immunoglobulin G. Studies with AFM provide advantages of achieving nanoscale resolution for detecting surface changes during steps of biochemical surface reactions, without requiring chemical modification of proteins or fluorescent labels.
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Affiliation(s)
| | | | - Jayne C. Garno
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
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33
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Keller TF, Reichert J, Thanh TP, Adjiski R, Spiess L, Berzina-Cimdina L, Jandt KD, Bossert J. Facets of protein assembly on nanostructured titanium oxide surfaces. Acta Biomater 2013; 9:5810-20. [PMID: 23142481 DOI: 10.1016/j.actbio.2012.10.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 10/23/2012] [Accepted: 10/30/2012] [Indexed: 12/25/2022]
Abstract
One key for the successful integration of implants into the human body is the control of protein adsorption by adjusting the surface properties at different length scales. This is particularly important for titanium oxide, one of the most common biomedical interfaces. As for titania (TiO(2)) the interface is largely defined by its crystal surface structure, it is crucial to understand how the surface crystallinity affects the structure, properties and function of protein layers mediating subsequent biological reactions. For rutile TiO(2) we demonstrate that the conformation and relative amount of human plasma fibrinogen (HPF) and the structure of adsorbed HPF layers depend on the crystal surface nanostructure by employing thermally etched multi-faceted TiO(2) surfaces. Thermal etching of polycrystalline TiO(2) facilitates a nanoscale crystal faceting and, thus, the creation of different surface nanostructures on a single specimen surface. Atomic force microscopy shows that HPF arranges into networks and thin globular layers on flat and irregular crystal grain surfaces, respectively. On a third, faceted category we observed an alternating conformation of HPF on neighboring facets. The bulk grain orientation obtained from electron backscatter diffraction and thermodynamic mechanisms of surface reconstruction during thermal etching suggest that the grain and facet surface-specific arrangement and relative amount of adsorbed proteins depend on the associated free crystal surface energy. The implications for potentially favorable TiO(2) crystal facets regarding the inflammatory response and hemostasis are discussed with a view to the advanced surface design of future implants.
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Pattanasiri B, Li YW, Landau DP, Wüst T, Triampo W. Conformational transitions of a confined lattice protein: A Wang-Landau study. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/402/1/012048] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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35
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Guedidi S, Portugal CA, Innocent C, Janot JM, Deratani A, Crespo JG. Fluorescence monitoring of trypsin adsorption in layer-by-layer membrane systems. Enzyme Microb Technol 2012; 51:325-33. [DOI: 10.1016/j.enzmictec.2012.07.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 07/21/2012] [Accepted: 07/27/2012] [Indexed: 01/06/2023]
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36
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Toba FA, Visai L, Trivedi S, Lowy FD. The role of ionic interactions in the adherence of the Staphylococcus epidermidis adhesin SdrF to prosthetic material. FEMS Microbiol Lett 2012; 338:24-30. [PMID: 23039791 DOI: 10.1111/1574-6968.12018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 10/01/2012] [Accepted: 10/03/2012] [Indexed: 11/28/2022] Open
Abstract
Staphylococcus epidermidis infections are common complications of prosthetic device implantation. SdrF, a surface protein, appears to play a critical role in the initial colonization step by adhering to type I collagen and Dacron™. The role of ionic interactions in S. epidermidis adherence to prosthetic material was examined. SdrF was cloned and expressed in Lactococcus lactis. The effect of pH, cation concentration, and detergents on adherence to different types of plastic surfaces was assessed by crystal violet staining and bacterial cell counting. SdrF, in contrast with controls and other S. epidermidis surface proteins, bound to hydrophobic materials such as polystyrene. Binding was an ionic interaction and was affected by surface charge of the plastic, pH, and cation concentration. Adherence of the SdrF construct was increased to positively charged plastics and was reduced by increasing concentrations of Ca(2+) and Na(+). Binding was optimal at pH 7.4. Kinetic studies demonstrated that the SdrF B domain as well as one of the B subdomains was sufficient to mediate binding. The SdrF construct also bound more avidly to Goretex™ than the lacotococcal control. SdrF is a multifunctional protein that contributes to prosthetic devices infections by ionic, as well as specific receptor-ligand interactions.
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Affiliation(s)
- Faustino A Toba
- Division of Infectious Diseases, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY, USA
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37
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Protein adsorption on nano-scaled, rippled TiO2 and Si surfaces. Biointerphases 2012; 7:55. [PMID: 22956465 DOI: 10.1007/s13758-012-0055-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Accepted: 08/13/2012] [Indexed: 10/27/2022] Open
Abstract
We synthesized nano-scaled periodic ripple patterns on silicon and titanium dioxide (TiO(2)) surfaces by xenon ion irradiation, and performed adsorption experiments with human plasma fibrinogen (HPF) on such surfaces as a function of the ripple wavelength. Atomic force microscopy showed the adsorption of HPF in mostly globular conformation on crystalline and amorphous flat Si surfaces as well as on nano-structured Si with long ripple wavelengths. For short ripple wavelengths the proteins seem to adsorb in a stretched formation and align across or along the ripples. In contrast to that, the proteins adsorb in a globular assembly on flat and long-wavelength rippled TiO(2), but no adsorbed proteins could be observed on TiO(2) with short ripple wavelengths due to a decrease of the adsorption energy caused by surface curvature. Consequently, the adsorption behavior of HPF can be tuned on biomedically interesting materials by introducing a nano-sized morphology while not modifying the stoichiometry/chemistry.
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38
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Sivaraman B, Latour RA. Time-dependent conformational changes in adsorbed albumin and its effect on platelet adhesion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2745-52. [PMID: 22191731 PMCID: PMC3286649 DOI: 10.1021/la204777x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Recent studies have shown that platelets can adhere to adsorbed albumin (Alb) through a receptor-mediated mechanism, but only if the Alb undergoes more than a critical degree of adsorption-induced unfolding. The objectives of this research were to investigate whether Alb that was initially adsorbed in a manner that induced unfolding that was less than this critical level would undergo further unfolding with time and, if so, whether this would induce the onset of platelet adhesion once this critical level was exceeded. To address these questions, CD spectropolarimetry was used to monitor the structure of Alb on OH- and CH(3)-functionalized alkanethiol self-assembled monolayer surfaces, with the Alb initially adsorbed under conditions resulting in degrees of unfolding that were below this critical level, and then the adsorbed Alb layers were aged over 6 months in sterile physiological saline at 37 °C. Platelet adhesion to Alb was quantified at selected time points via a lactate dehydrogenase (LDH) assay. The results indicate that an adsorbed Alb layer does undergo further structural changes with increasing residence time and supports platelet adhesion once it unfolds beyond the previously determined critical level. These results may be relevant to the clinically observed problem of the onset of late-thrombosis, which occurs on cardiovascular implants such as drug-eluting stents.
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Wörz A, Berchtold B, Moosmann K, Prucker O, Rühe J. Protein-resistant polymer surfaces. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30820g] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Hayashi T, Tanaka Y, Koide Y, Tanaka M, Hara M. Mechanism underlying bioinertness of self-assembled monolayers of oligo(ethyleneglycol)-terminated alkanethiols on gold: protein adsorption, platelet adhesion, and surface forces. Phys Chem Chem Phys 2012; 14:10196-206. [DOI: 10.1039/c2cp41236e] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Ovod V, Scott EA, Flake MM, Parker SR, Bateman RJ, Elbert DL. Exposure of the lysine in the gamma chain dodecapeptide of human fibrinogen is not enhanced by adsorption to poly(ethylene terephthalate) as measured by biotinylation and mass spectrometry. J Biomed Mater Res A 2011; 100:622-31. [PMID: 22213354 DOI: 10.1002/jbm.a.33285] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2011] [Revised: 09/27/2011] [Accepted: 09/28/2011] [Indexed: 11/08/2022]
Abstract
Conformational changes in adsorbed fibrinogen may enhance the exposure of platelet adhesive sites that are inaccessible in solution. To test this hypothesis, mass spectrometric methods were developed to quantify chemical modification of lysine residues following adsorption of fibrinogen to biomaterials. The quantitative method used an internal standard consisting of isotope-labeled fibrinogen secreted by human HepG2 cells in culture. Lysine residues in the internal standard were partially reacted with NHS-biotin. For the experimental samples, normal human fibrinogen was adsorbed to poly(ethylene terephthalate) (PET) particles. The adsorbed fibrinogen was reacted with NHS-biotin and then eluted from the particles. Constant amounts of internal standard were added to sample fibrinogen and analyzed by liquid chromatography/tandem mass spectrometry. Biotinylation of the lysine residue in the platelet-adhesive gamma chain dodecapeptide (GCDP) was quantified by comparison with the internal standard. Approximately 80% of the GCDP peptides were biotinylated when fibrinogen was reacted with NHS-biotin in solution or adsorbed onto PET. These results are generally consistent with previous antibody binding studies and suggest that other regions of fibrinogen may be crucial in promoting platelet adhesion to materials. The results do not directly address but are consistent with the hypothesis that only activated platelets adhere to adsorbed fibrinogen.
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Affiliation(s)
- Vitaliy Ovod
- Department of Biomedical Engineering and Center for Materials Innovation, Washington University, St. Louis, Missouri, USA
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Gugutkov D, González-García C, Altankov G, Salmerón-Sánchez M. Fibrinogen organization at the cell-material interface directs endothelial cell behavior. J BIOACT COMPAT POL 2011. [DOI: 10.1177/0883911511409020] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Fibrinogen (FG) adsorption on surfaces with controlled fraction of —OH groups was investigated with AFM and correlated to the initial interaction of primary endothelial cells (HUVEC). The —OH content was tailored making use of a family of copolymers consisting of ethyl acrylate (EA) and hydroxyl ethyl acrylate (HEA) in different ratios. The supramolecular distribution of FG changed from an organized network-like structure on the most hydrophobic surface (—OH 0) to dispersed molecular aggregate one as the fraction of —OH groups increases, indicating a different conformation by the adsorbed protein. The best cellular interaction was observed on the most hydrophobic (—OH 0) surface where FG assembled in a fibrin-like appearance in the absence of any thrombin. Likewise, focal adhesion formation and actin cytoskeleton development was poorer as the fraction of hydroxy groups on the surface was increased. The biological activity of the surface-induced FG network to provide 3D cues in a potential tissue engineered scaffold, making use of electrospun PEA fibers (—OH0), seeded with human umbilical vein endothelial cells was investigated. The FG assembled on the polymer fibers gave rise to a biologically active network able to direct cell orientation along the fibers (random or aligned), promote cytoskeleton organization and focal adhesion formation.
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Affiliation(s)
| | | | - George Altankov
- Institut de Bioenginyeria de Catalunya, Barcelona, Spain, ICREA (Institució Catalana de Recerca i Estudis Avançats), Catalonia, Spain
| | - Manuel Salmerón-Sánchez
- Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Spain, CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain, Regenerative Medicine Unit, Centro de Investigación Príncipe Felipe, Valencia, Spain,
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Bioinert surface to protein adsorption with higher generation of dendrimer SAMs. Colloids Surf B Biointerfaces 2011; 84:280-4. [DOI: 10.1016/j.colsurfb.2011.01.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2010] [Revised: 01/01/2011] [Accepted: 01/01/2011] [Indexed: 11/19/2022]
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Zavyalova EG, Protopopova AD, Kopylov AM, Yaminsky IV. Investigation of early stages of fibrin association. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4922-4927. [PMID: 21428306 DOI: 10.1021/la200148n] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Interactions between fibrinogen molecules proteolytically cleaved with thrombin were investigated using atomic force microscopy (AFM) and dynamic light scattering (DLS). Gradually decreased fibrinogen concentrations were used to study the fibrin network, large separated fibrils, small fibrils in the initial association stages, and protofibrils. In addition, a new type of structure was found in AFM experiments at a low fibrinogen concentration (20 nM): the molecules in these single-stranded associates are arranged in a row, one after the other. The height, diameter, and distance between domains in these single-stranded associates were the same as those in the original fibrinogen molecules. DLS data assumed formation of extended associates in bulk solution at fibrinogen concentration as low as 20 nM.
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Affiliation(s)
- Elena G Zavyalova
- Chemistry Department, M. V. Lomonosov Moscow State University, Leninskie gory 1-3, Moscow, 119991 Russian Federation.
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Hassan N, Maldonado-Valderrama J, Gunning AP, Morris VJ, Ruso JM. Surface Characterization and AFM Imaging of Mixed Fibrinogen−Surfactant Films. J Phys Chem B 2011; 115:6304-11. [DOI: 10.1021/jp200835j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Natalia Hassan
- Soft Matter and Molecular Biophysics
Group, Department of Applied Physics University of Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela,
Spain
| | | | - A. Patrick Gunning
- Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, U.K
| | - Victor J. Morris
- Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, U.K
| | - Juan M. Ruso
- Soft Matter and Molecular Biophysics
Group, Department of Applied Physics University of Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela,
Spain
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Kastantin M, Langdon BB, Chang EL, Schwartz DK. Single-molecule resolution of interfacial fibrinogen behavior: effects of oligomer populations and surface chemistry. J Am Chem Soc 2011; 133:4975-83. [PMID: 21391676 PMCID: PMC3077424 DOI: 10.1021/ja110663u] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Through the use of single-molecule total internal reflection fluorescence microscopy, the dynamic behavior of fibrinogen was observed at the interface between aqueous solution and various solid surfaces. Multiple populations of objects were observed, as characterized by surface residence times, interfacial diffusion, and fluorescence intensity. On all surfaces, populations exhibited direct links between surface residence time, rate of diffusion, and fluorescence intensity. In particular, longer-lived populations diffused more slowly and exhibited greater fluorescence intensity, leading to the conclusion that the objects represented fibrinogen monomers and discrete oligomer populations (dimers, trimers, etc.), and that these oligomer populations play an important role in the protein-surface interaction because of their long surface residence times. Two or three diffusive modes were observed for most populations, indicating that protein aggregates have multiple mechanisms for interaction with solid substrates. In addition, the fastest diffusive mode is believed to represent a hopping mode that often precedes desorption events. Surprisingly, a monolayer of 5000 Da poly(ethylene glycol) (PEG5000) increased surface residence time and slowed diffusion of fibrinogen relative to bare fused silica or hydrophobically modified fused silica, suggesting that the mechanism of PEG resistance to protein adhesion is more sophisticated than the simple repulsion of individual proteins.
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Affiliation(s)
- Mark Kastantin
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309
| | - Blake B. Langdon
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309
| | - Erin L. Chang
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309
| | - Daniel K. Schwartz
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309
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High-resolution visualization of fibrinogen molecules and fibrin fibers with atomic force microscopy. Biomacromolecules 2010; 12:370-9. [PMID: 21192636 DOI: 10.1021/bm101122g] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report an atomic force microscopy (AFM) study of fibrinogen molecules and fibrin fibers with resolution previously achieved only in few electron microscopy images. Not only are all objects triads, but the peripheral D regions are resolved into the two subdomains, apparently corresponding to the βC and γC domains. The conformational analysis of a large population of fibrinogen molecules on mica revealed the two most energetically favorable conformations characterized by bending angles of ∼100 and 160 degrees. Computer modeling of the experimental images of fibrinogen molecules showed that the AFM patterns are in good agreement with the molecular dimensions and shapes detected by other methods. Imaging in different environments supports the expected hydration of the fibrinogen molecules in buffer, whereas imaging in humid air suggests the 2D spreading of fibrinogen on mica induced by an adsorbed water layer. Visualization of intact hydrated fibrin fibers showed cross-striations with an axial period of 24.0 ± 1.6 nm, in agreement with a pattern detected earlier with electron microscopy and small-angle X-ray diffraction. However, this order is clearly detected on the surface of thin fibers and becomes less discernible with the fiber's growth. This structural change is consistent with the proposal that thinner fibers are denser than thicker ones, that is, that the molecule packing decreases with the increasing of the fibers' diameter.
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Yermolenko IS, Fuhrmann A, Magonov SN, Lishko VK, Oshkadyerov SP, Ros R, Ugarova TP. Origin of the nonadhesive properties of fibrinogen matrices probed by force spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17269-77. [PMID: 20883009 PMCID: PMC2993253 DOI: 10.1021/la101791r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The deposition of a multilayered fibrinogen matrix on various surfaces results in a dramatic reduction of integrin-mediated cell adhesion and outside-in signaling in platelets and leukocytes. The conversion of a highly adhesive, low-density fibrinogen substrate to the nonadhesive high-density fibrinogen matrix occurs within a very narrow range of fibrinogen coating concentrations. The molecular events responsible for this transition are not well understood. Herein, single-cell and molecular force spectroscopy were used to determine the early steps in the formation of nonadhesive fibrinogen substrates. We show that the adsorption of fibrinogen in the form of a molecular bilayer coincides with a several-fold reduction in the adhesion forces generated between the AFM tip and the substrate as well as between a cell and the substrate. The subsequent deposition of new layers at higher coating concentrations of fibrinogen results in a small additional decrease in adhesion forces. The poorly adhesive fibrinogen bilayer is more extensible under an applied tensile force than is the surface-bound fibrinogen monolayer. Following chemical cross-linking, the stabilized bilayer displays the mechanical and adhesive properties characteristic of a more adhesive fibrinogen monolayer. We propose that a greater compliance of the bi- and multilayer fibrinogen matrices has its origin in the interaction between the molecules forming the adjacent layers. Understanding the mechanical properties of nonadhesive fibrinogen matrices should be of importance in the therapeutic control of pathological thrombosis and in biomaterials science.
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Affiliation(s)
- Ivan S. Yermolenko
- Center for Metabolic Biology and School of Life Sciences
- Institute for Metal Physics, NAS of Ukraine, Kiev
| | | | | | | | | | - Robert Ros
- Department of Physics, Arizona State University, Tempe, AZ 85287
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Schmitt Y, Hähl H, Gilow C, Mantz H, Jacobs K, Leidinger O, Bellion M, Santen L. Structural evolution of protein-biofilms: Simulations and experiments. BIOMICROFLUIDICS 2010; 4:32201. [PMID: 21045923 PMCID: PMC2967234 DOI: 10.1063/1.3488672] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Accepted: 08/23/2010] [Indexed: 05/15/2023]
Abstract
The control of biofilm formation is a challenging goal that has not been reached yet in many aspects. One unsolved question is the role of van der Waals forces and another is the importance of mutual interactions between the adsorbing and the adsorbed biomolecules ("critical crowding"). In this study, a combined experimental and theoretical approach is presented, which fundamentally probes both aspects. On three model proteins-lysozyme, α-amylase, and bovine serum albumin-the adsorption kinetics is studied experimentally. Composite substrates are used enabling a separation of the short- and the long-range forces. Although usually neglected, experimental evidence is given for the influence of van der Waals forces on the protein adsorption as revealed by in situ ellipsometry. The three proteins were chosen for their different conformational stabilities in order to investigate the influence of conformational changes on the adsorption kinetics. Monte Carlo simulations are used to develop a model for these experimental results by assuming an internal degree of freedom to represent conformational changes. The simulations also provide data on the distribution of adsorption sites. By in situ atomic force microscopy we can also test this distribution experimentally, which opens the possibility to, e.g., investigate the interactions between adsorbed proteins.
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Gon S, Bendersky M, Ross JL, Santore MM. Manipulating protein adsorption using a patchy protein-resistant brush. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:12147-12154. [PMID: 20557060 DOI: 10.1021/la1016752] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Toward the development of surfaces for the precise manipulation of proteins, this study explores the fabrication and protein-interactive behavior of a new type of surface containing extremely small (on the order of 10 nm or less) flat adhesive "patches" or islands embedded in and partially concealed by a protein-repellant PEG (poly(ethylene glycol)) brush. The adsorption of fibrinogen, the model protein chosen to probe the biomaterial interactions of these surfaces, is very sensitive to the surface density of the adhesive patches, occurring only above a threshold. This suggests that two or more adhesive patches are needed to capture each protein. When the average spacing of the adhesive patches exceeds the fibrinogen length, no adsorption occurs because individual patches are too weakly binding for protein capture, as a result of being at least partially obstructed by the brush. The small size of the adhesive patches relative to the 47 nm fibrinogen length thus defines a limiting regime of surface design, distinct from surfaces where larger features can adhere single isolated proteins or multiple proteins together. The restricted protein-surface contact may comprise a means of preserving protein structure and function in the adsorbed state. This article demonstrates several additional interesting features of PEG brushes relevant to biomaterial design. First a moderate amount of adhesive material can be buried at the base of a brush without a measurable impact on the corona density. Second, a different amount of material at the base of a brush can be rendered ineffective to capturing adhesive proteins, despite a modest compromise of the brush corona. From this will follow insight into the design of patterned biomaterial surfaces, the bioactivity of the edges of patterned features, and an understanding of how flaws in brushes compromise protein resistance or allow access to small adhesive sites.
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Affiliation(s)
- Saugata Gon
- Department of Chemical Engineering, University of Massachusetts, Amherst, Massachusetts 01003, USA
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