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Solovieva AO, Sitnikova NA, Nimaev VV, Koroleva EA, Manakhov AM. PRP of T2DM Patient Immobilized on PCL Nanofibers Stimulate Endothelial Cells Proliferation. Int J Mol Sci 2023; 24:ijms24098262. [PMID: 37175994 PMCID: PMC10179416 DOI: 10.3390/ijms24098262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/01/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023] Open
Abstract
Diabetic foot ulcers (DFU) are a common complication of Type 2 Diabetes Mellitus (T2DM). Development of bioactive wound healing covers is an important task in medicine. The use of autologous platelet-rich plasma (PRP) consisting of growth factors, cytokines and components of extracellular matrix is a perspective approach for DFU treatment, but we previously found that some T2DM PRP samples have a toxic effect on mesenchymal stem cells (MSCs) in vitro. Here, we covalently immobilized T2DM PRP proteins on polycaprolactone (PCL) nanofibers, and the growth of endothelial cells on the PCL-COOH-PRP was investigated. Additionally, the level of NO reflecting the cytotoxic effects of PRP, angiogenin, and VEGF levels were measured in T2DM PRP samples. The results showed that the application of PCL-COOH-PRP nanofibers allows to remove the cytotoxicity of T2DM PRP and to improve endothelial cell adhesion and proliferative activity. We showed that the origin of T2DM PRP (the level of PRP toxicity or presence/absence of DFU) does not influence the efficiency of cell growth on PCL-COOH-PRP, and on the level of angiogenin, vascular epidermal growth factor (VEGF) in PRP itself.
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Affiliation(s)
- Anastasiya O Solovieva
- Research Institute of Clinical and Experimental Lymphology-Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia
| | - Natalia A Sitnikova
- Research Institute of Clinical and Experimental Lymphology-Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia
| | - Vadim V Nimaev
- Research Institute of Clinical and Experimental Lymphology-Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia
| | - Elena A Koroleva
- Research Institute of Clinical and Experimental Lymphology-Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia
| | - Anton M Manakhov
- Research Institute of Clinical and Experimental Lymphology-Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia
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Immobilization and Release of Platelet-Rich Plasma from Modified Nanofibers Studied by Advanced X-ray Photoelectron Spectroscopy Analyses. Polymers (Basel) 2023; 15:polym15061440. [PMID: 36987220 PMCID: PMC10056793 DOI: 10.3390/polym15061440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 03/02/2023] [Accepted: 03/07/2023] [Indexed: 03/15/2023] Open
Abstract
Platelet-rich Plasma (PRP) is an ensemble of growth factors, extracellular matrix components, and proteoglycans that are naturally balanced in the human body. In this study, the immobilization and release of PRP component nanofiber surfaces modified by plasma treatment in a gas discharge have been investigated for the first time. The plasma-treated polycaprolactone (PCL) nanofibers were utilized as substrates for the immobilization of PRP, and the amount of PRP immobilized was assessed by fitting a specific X-ray Photoelectron Spectroscopy (XPS) curve to the elemental composition changes. The release of PRP was then revealed by measuring the XPS after soaking nanofibers containing immobilized PRP in buffers of varying pHs (4.8; 7.4; 8.1). Our investigations have proven that the immobilized PRP would continue to cover approximately fifty percent of the surface after eight days.
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Adhesion and Proliferation of Mesenchymal Stem Cells on Plasma-Coated Biodegradable Nanofibers. JOURNAL OF COMPOSITES SCIENCE 2022. [DOI: 10.3390/jcs6070193] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Various biomedical applications of biodegradable nanofibers are a hot topic, as evidenced by the ever-increasing number of publications in this field. However, as-prepared nanofibers suffer from poor cell adhesion, so their surface is often modified. In this work, active polymeric surface layers with different densities of COOH groups from 5.1 to 14.4% were successfully prepared by Ar/CO2/C2H4 plasma polymerization. It has been shown that adhesion and proliferation of mesenchymal stem cells (MSCs) seeded onto plasma-modified PCL nanofibers are controlled by the CO2:C2H4 ratio. At a high CO2:C2H4 ratio, a well-defined network of actin microfilaments is observed in the MSCs. Nanofibers produced at a low CO2:C2H4 ratio showed poor cell adhesion and very poor survival. There were significantly fewer cells on the surface, they had a small spreading area, a poorly developed network of actin filaments, and there were almost no stress fibrils. The maximum percentage of proliferating cells was recorded at a CO2:C2H4 ratio of 35:15 compared with gaseous environments of 25:20 and 20:25 (24.1 ± 1.5; 8.4 ± 0.9, and 4.1 ± 0.4%, respectively). Interestingly, no differences were observed between the number of cells on the untreated surface and the plasma-polymerized surface at CO2:C2H4 = 20:25 (4.9 ± 0.6 and 4.1 ± 0.4, respectively). Thus, Ar/CO2/C2H4 plasma polymerization can be an excellent tool for regulating the viability of MSCs by simply adjusting the CO2:C2H4 ratio.
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Permyakova ES, Konopatsky AS, Ershov KI, Bakhareva KI, Sitnikova NA, Shtansky DV, Solovieva AO, Manakhov AM. Ag-Contained Superabsorbent Curdlan–Chitosan Foams for Healing Wounds in a Type-2 Diabetic Mice Model. Pharmaceutics 2022; 14:pharmaceutics14040724. [PMID: 35456559 PMCID: PMC9032745 DOI: 10.3390/pharmaceutics14040724] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 03/16/2022] [Accepted: 03/23/2022] [Indexed: 12/13/2022] Open
Abstract
This study focused on the synthesis and characterization of pure curdlan–chitosan foams (CUR/CS), as well as foams containing Ag nanoparticles (CUR/CS/Ag), and their effect on the skin repair of diabetic mice (II type). The layer of antibacterial superabsorbent foam provides good oxygenation, prevents bacterial infection, and absorbs exudate, forming a soft gel (moist environment). These foams were prepared from a mixture of hydrolyzed curdlan and chitosan by lyophilization. To enhance the antibacterial properties, an AgNO3 solution was added to the curdlan/chitosan mixture during the polymerization and was then reduced by UV irradiation. The membranes were further investigated for their structure and composition using optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, FT-IR spectroscopy, and XPS analysis and modeling. In vivo tests demonstrated that CUR/CS/Ag significantly boosted the regeneration process compared with pure CUR/CS and the untreated control.
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Affiliation(s)
- Elizaveta S. Permyakova
- Laboratory of Inorganic Nanomaterials, National University of Science and Technology “MISiS”, Leninsky Prospekt 4, 119049 Moscow, Russia; (A.S.K.); (D.V.S.)
- Laboratory of Pharmacological Active Compounds, Research Institute of Clinical and Experimental Lymphology—Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia; (K.I.E.); (K.I.B.); (N.A.S.); (A.O.S.)
- Correspondence: (E.S.P.); (A.M.M.); Tel.: +7-916-278-01-99 (E.S.P.)
| | - Anton S. Konopatsky
- Laboratory of Inorganic Nanomaterials, National University of Science and Technology “MISiS”, Leninsky Prospekt 4, 119049 Moscow, Russia; (A.S.K.); (D.V.S.)
| | - Konstantin I. Ershov
- Laboratory of Pharmacological Active Compounds, Research Institute of Clinical and Experimental Lymphology—Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia; (K.I.E.); (K.I.B.); (N.A.S.); (A.O.S.)
| | - Ksenia I. Bakhareva
- Laboratory of Pharmacological Active Compounds, Research Institute of Clinical and Experimental Lymphology—Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia; (K.I.E.); (K.I.B.); (N.A.S.); (A.O.S.)
| | - Natalya A. Sitnikova
- Laboratory of Pharmacological Active Compounds, Research Institute of Clinical and Experimental Lymphology—Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia; (K.I.E.); (K.I.B.); (N.A.S.); (A.O.S.)
| | - Dmitry V. Shtansky
- Laboratory of Inorganic Nanomaterials, National University of Science and Technology “MISiS”, Leninsky Prospekt 4, 119049 Moscow, Russia; (A.S.K.); (D.V.S.)
| | - Anastasiya O. Solovieva
- Laboratory of Pharmacological Active Compounds, Research Institute of Clinical and Experimental Lymphology—Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia; (K.I.E.); (K.I.B.); (N.A.S.); (A.O.S.)
| | - Anton M. Manakhov
- Laboratory of Pharmacological Active Compounds, Research Institute of Clinical and Experimental Lymphology—Branch of the ICG SB RAS, 2 Timakova Str., 630060 Novosibirsk, Russia; (K.I.E.); (K.I.B.); (N.A.S.); (A.O.S.)
- Correspondence: (E.S.P.); (A.M.M.); Tel.: +7-916-278-01-99 (E.S.P.)
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Döring J, Crackau M, Nestler C, Welzel F, Bertrand J, Lohmann CH. Characteristics of different cathodic arc deposition coatings on CoCrMo for biomedical applications. J Mech Behav Biomed Mater 2019; 97:212-221. [PMID: 31129165 DOI: 10.1016/j.jmbbm.2019.04.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/11/2019] [Accepted: 04/13/2019] [Indexed: 01/19/2023]
Abstract
Coatings of endoprostheses are used to improve the tribological performance of arthroplasties. A major challenge for the successful use of these coatings, however, is a stable layer adhesion, a smooth surface, as well as a reduction in droplet formation during the coating process. Explants with commercially available coatings were investigated to assess surface/layer defects and adhesion properties. For the investigation of new coatings, we used cathodic arc deposition (Arc-PVD) to generate TiN, ZrN similar to the currently commercially available coatings and three different diamond like carbon (DLC) coatings on CoCrMo substrate. All surface coatings were mechanically specified by measuring roughness, coating thickness, abrasive wear and critical loads. A friction wear test was modified using an UHMWPE counterpart with a contact pressure of 10 MPa to compare different coatings in one tribological test setup. Calf serum was used as lubricant. The commercially used coatings on the retrieved explants show several defects and the critical load for coating failure varied widely. All produced surface coatings showed an increased surface roughness after coating compared to uncoated samples, which was due to droplet formation, especially in the DLC coatings. A diamond post-polishing process was performed to reduce the surface roughness and reach the ISO standard of Ra < 50 nm. The ZrN and TiN coatings exhibited a decreased friction after removing of the droplets in comparison to uncoated CoCrMo samples, indicating that the post-polishing process might be a useful tool to ameliorate the tribological performance. The friction coefficient for all tested DLC layers was more than two times increased compared to the CoCrMo samples. The use of hard/soft bearings with DLC coated endoprostheses seems to be not advantageous.
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Affiliation(s)
- Joachim Döring
- Department of Orthopaedic Surgery, Medical Faculty, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany.
| | - Maria Crackau
- Department of Orthopaedic Surgery, Medical Faculty, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Christian Nestler
- Department of Orthopaedic Surgery, Medical Faculty, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany; Institute of Manufacturing Technology and Quality Management, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Florian Welzel
- Institute of Manufacturing Technology and Quality Management, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Jessica Bertrand
- Department of Orthopaedic Surgery, Medical Faculty, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Christoph H Lohmann
- Department of Orthopaedic Surgery, Medical Faculty, Otto-von-Guericke-University Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
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Manakhov A, Fuková Š, Nečas D, Michlíček M, Ershov S, Eliaš M, Visotin M, Popov Z, Zajíčková L. Analysis of epoxy functionalized layers synthesized by plasma polymerization of allyl glycidyl ether. Phys Chem Chem Phys 2018; 20:20070-20077. [DOI: 10.1039/c8cp01452c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The deposition of epoxide groups by plasma polymerization opens new horizons for robust and quick immobilization of biomolecules on any type of substrate.
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Affiliation(s)
- Anton Manakhov
- National University of Science and Technology “MISiS”
- Leninsky pr. 4
- Moscow 119049
- Russia
| | - Šárka Fuková
- RG Plasma Technologies
- CEITEC – Central European Institute of Technology
- Masaryk University
- Purkyňova 123
- Brno 61200
| | - David Nečas
- RG Plasma Technologies
- CEITEC – Central European Institute of Technology
- Masaryk University
- Purkyňova 123
- Brno 61200
| | - Miroslav Michlíček
- RG Plasma Technologies
- CEITEC – Central European Institute of Technology
- Masaryk University
- Purkyňova 123
- Brno 61200
| | - Sergey Ershov
- Materials Research and Technology Department
- Luxembourg Institute of Science and Technology
- 5 avenue des Hauts-Fourneaux
- Esch-sur-Alzette
- Luxembourg
| | - Marek Eliaš
- RG Plasma Technologies
- CEITEC – Central European Institute of Technology
- Masaryk University
- Purkyňova 123
- Brno 61200
| | - Maxim Visotin
- Siberian Federal University
- 79 Svobodny av
- Krasnoyarsk
- Russian Federation
- Federal Research Center KSC SB RAS
| | - Zakhar Popov
- National University of Science and Technology “MISiS”
- Leninsky pr. 4
- Moscow 119049
- Russia
| | - Lenka Zajíčková
- RG Plasma Technologies
- CEITEC – Central European Institute of Technology
- Masaryk University
- Purkyňova 123
- Brno 61200
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Asano T, Suwannasom P, Katagiri Y, Miyazaki Y, Sotomi Y, Kraak RP, Wykrzykowska J, Rensing BJ, Piek JJ, Gyöngyösi M, Serruys PW, Onuma Y. First-in-Man Trial of SiO 2 Inert-Coated Bare Metal Stent System in Native Coronary Stenosis - The AXETIS FIM Trial. Circ J 2017; 82:477-485. [PMID: 28717068 DOI: 10.1253/circj.cj-17-0337] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND A novel bare metal stent with an SiO2coating was developed to prevent excessive neointimal hyperplasia by inertization of the metallic stent surface. The efficacy of the device was demonstrated in a preclinical model. The aim of this first-in-man trial was to assess the safety and feasibility of the new device.Methods and Results:This prospective non-randomized single-arm trial was designed to enroll 35 patients with a de novo coronary lesion. Quantitative coronary angiography and optical coherence tomography (OCT) were performed at the baseline procedure and at the 6-month follow-up. Stent implantation was performed with OCT guidance according to optimal stent implantation criteria. The trial was terminated upon the advice of the data safety monitoring board after enrolling 14 patients due to the high incidence of re-intervention. Optimal OCT implantation criteria were achieved in only 8.3% of lesions. At 6 months, angiographic in-stent late lumen loss as the primary endpoint was 0.77±0.44 mm, and binary restenosis occurred in 33.3% of lesions. At the 6-month OCT, neointimal volume obstruction was 32.8±15.6% with a neointimal thickness of 237±117 µm. At 12 months, the device-oriented composite endpoint (defined as cardiac death, target vessel myocardial infarction, and clinically indicated target lesion revascularization rate) was 33.3%. CONCLUSIONS In contrast with the preclinical study, the Axetis stent did not efficiently suppress neointimal hyperplasia in humans in this trial.
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Affiliation(s)
- Taku Asano
- AMC Heart Center, Academic Medical Center, University of Amsterdam
| | | | - Yuki Katagiri
- AMC Heart Center, Academic Medical Center, University of Amsterdam
| | | | - Yohei Sotomi
- AMC Heart Center, Academic Medical Center, University of Amsterdam
| | - Robin P Kraak
- AMC Heart Center, Academic Medical Center, University of Amsterdam
| | | | | | - Jan J Piek
- AMC Heart Center, Academic Medical Center, University of Amsterdam
| | | | - Patrick W Serruys
- International Centre for Circulatory Health, National Heart and Lung Institute, Imperial College London
| | - Yoshinobu Onuma
- Thorax Center, Erasmus Medical Center, Erasmus University.,Cardialysis
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Liao TT, Deng QY, Li SS, Li X, Ji L, Wang Q, Leng YX, Huang N. Evaluation of the Size-Dependent Cytotoxicity of DLC (Diamondlike Carbon) Wear Debris in Arthroplasty Applications. ACS Biomater Sci Eng 2017; 3:530-539. [PMID: 33429620 DOI: 10.1021/acsbiomaterials.6b00618] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Patients with DLC (diamond like carbon)-coated artificial joints may be exposed to a wide size range of DLC wear debris (DW). In this study, the cytotoxicity of DW of different size ranges (0-0.22, 0.22-0.65, 0.65-1.0, and 1.0-5.0 μm) was evaluated. The microstructure and physical characteristics of DW were investigated by Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscope (SEM), and dynamic light scattering (DLS). Macrophages, osteoblasts, and fibroblasts were incubated with DW of different size ranges respectively followed by cytotoxicity evaluations of inflammatory cytokines, alkaline phosphatase (ALP) assays, and related signal protein expression analysis. The results showed that, except for the size range of 0-0.22 μm, DW cytotoxicity showed a size-dependent (0.22-5.0 μm) decrease with increasing size. Within the range of 0.22-5.0 μm, DW of larger size resulted in lessened inflammatory response and enhanced osteoblastogenesis and fibrogenesis, with increased viability of cells (macrophages, osteoblasts, and fibroblasts), better morphology, less release of pro-inflammatory factors and more release of anti-inflammatory factors. The results demonstrated that DW sizes below 0.22 μm had less negative effects on cell adhesion and growth because of the BSA (bovine serum albumin) encapsulation effect. These findings provide valuable knowledge about the comprehensive mechanism of promotion of inflammatory response and inhibition of osteoblastogenesis and fibrogenesis induced by DW. In conclusion, an effective system of biocompatibility evaluation for different sizes of DW was derived.
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Affiliation(s)
- T T Liao
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Q Y Deng
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - S S Li
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - X Li
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - L Ji
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Q Wang
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Y X Leng
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - N Huang
- Key Laboratory for Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
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Liao TT, Deng QY, Wu BJ, Li SS, Li X, Wu J, Leng YX, Guo YB, Huang N. Dose-dependent cytotoxicity evaluation of graphite nanoparticles for diamond-like carbon film application on artificial joints. Biomed Mater 2017; 12:015018. [DOI: 10.1088/1748-605x/aa52ca] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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10
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Böke F, Giner I, Keller A, Grundmeier G, Fischer H. Plasma-Enhanced Chemical Vapor Deposition (PE-CVD) yields better Hydrolytical Stability of Biocompatible SiOx Thin Films on Implant Alumina Ceramics compared to Rapid Thermal Evaporation Physical Vapor Deposition (PVD). ACS APPLIED MATERIALS & INTERFACES 2016; 8:17805-17816. [PMID: 27299181 DOI: 10.1021/acsami.6b04421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Densely sintered aluminum oxide (α-Al2O3) is chemically and biologically inert. To improve the interaction with biomolecules and cells, its surface has to be modified prior to use in biomedical applications. In this study, we compared two deposition techniques for adhesion promoting SiOx films to facilitate the coupling of stable organosilane monolayers on monolithic α-alumina; physical vapor deposition (PVD) by thermal evaporation and plasma enhanced chemical vapor deposition (PE-CVD). We also investigated the influence of etching on the formation of silanol surface groups using hydrogen peroxide and sulfuric acid solutions. The film characteristics, that is, surface morphology and surface chemistry, as well as the film stability and its adhesion properties under accelerated aging conditions were characterized by means of X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), inductively coupled plasma-optical emission spectroscopy (ICP-OES), and tensile strength tests. Differences in surface functionalization were investigated via two model organosilanes as well as the cell-cytotoxicity and viability on murine fibroblasts and human mesenchymal stromal cells (hMSC). We found that both SiOx interfaces did not affect the cell viability of both cell types. No significant differences between both films with regard to their interfacial tensile strength were detected, although failure mode analyses revealed a higher interfacial stability of the PE-CVD films compared to the PVD films. Twenty-eight day exposure to simulated body fluid (SBF) at 37 °C revealed a partial delamination of the thermally deposited PVD films whereas the PE-CVD films stayed largely intact. SiOx layers deposited by both PVD and PE-CVD may thus serve as viable adhesion-promoters for subsequent organosilane coupling agent binding to α-alumina. However, PE-CVD appears to be favorable for long-term direct film exposure to aqueous solutions.
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Affiliation(s)
- Frederik Böke
- Department of Dental Materials and Biomaterials Research, RWTH Aachen University Hospital , Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Ignacio Giner
- Technical and Macromolecular Chemistry, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Adrian Keller
- Technical and Macromolecular Chemistry, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Guido Grundmeier
- Technical and Macromolecular Chemistry, University of Paderborn , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Horst Fischer
- Department of Dental Materials and Biomaterials Research, RWTH Aachen University Hospital , Pauwelsstrasse 30, 52074 Aachen, Germany
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