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Chen C, Chen Y, Lan YJ, Tian MN, Zhang YM, Lei ZY, Fan DL. Effects of substrate topography on the regulation of human fibroblasts and capsule formation via modulating macrophage polarization. Colloids Surf B Biointerfaces 2023; 222:113086. [PMID: 36542953 DOI: 10.1016/j.colsurfb.2022.113086] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/25/2022] [Accepted: 12/08/2022] [Indexed: 12/23/2022]
Abstract
The host-material interface is critical in determining the successful integration of medical devices into human tissue. The surface topography can regulate the fibrous capsule formation around implants through macrophage polarization, but the exact mechanism remains unclear. In this study, four types of microgrooves (10 or 50 µm in groove depths and 50 or 200 µm in groove widths) were fabricated on polydimethylsiloxane (PDMS) using lithography. The microgroove surfaces were characterized using the laser scanning confocal microscopy and fourier transform infrared spectroscopy. The effect of surface topography on macrophage phenotypes and conditioned medium (CM) collected from macrophages on human foreskin fibroblast 1 (HFF-1) were investigated. The result revealed that a deeper and narrower microgroove structure means a rougher surface. Macrophages tended to adhere and aggregate on group 50-50 surface (groove depths and widths of 50 µm). THP-1 cell polarized toward both inflammatory M1 and anti-inflammatory M2 macrophages on the surface of each group. Meanwhile, CM from macrophages culture on PDMS differentially up-regulated the proliferation, migration and fibrosis of HFF-1. Among them, the group 50-50 had the strongest promoting effect. In vivo, the inflammatory response and fibrotic capsule around the implants were observed at 1 week and 4 weeks. As time passed, the inflammatory response decreased, while the capsule thickness continued to increase. The rough material surface was more inclined to develop a severe fibrotic encapsulation. In conclusion, this finding further suggested a potential immunomodulatory effect of macrophages in mediating the fibrotic response to implants and facilitated the design of biomaterial interfaces for improving tissue integration.
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Affiliation(s)
- Cheng Chen
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China
| | - Yao Chen
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China
| | - Yu-Jie Lan
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China
| | - Meng-Nan Tian
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China
| | - Yi-Ming Zhang
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China
| | - Ze-Yuan Lei
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China
| | - Dong-Li Fan
- Department of Plastic and Cosmetic Surgery, Xinqiao Hospital, Army Medical University, Xinqiao Road, Sha Ping Ba District, Chongqing 400037, China.
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Singh YP, Moses JC, Bhardwaj N, Mandal BB. Injectable hydrogels: a new paradigm for osteochondral tissue engineering. J Mater Chem B 2018; 6:5499-5529. [PMID: 32254962 DOI: 10.1039/c8tb01430b] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Osteochondral tissue engineering has become a promising strategy for repairing focal chondral lesions and early osteoarthritis (OA), which account for progressive joint pain and disability in millions of people worldwide. Towards improving osteochondral tissue repair, injectable hydrogels have emerged as promising matrices due to their wider range of properties such as their high water content and porous framework, similarity to the natural extracellular matrix (ECM), ability to encapsulate cells within the matrix and ability to provide biological cues for cellular differentiation. Further, their properties such as those that facilitate minimally invasive deployment or delivery, and their ability to repair geometrically complex irregular defects have been critical for their success. In this review, we provide an overview of innovative approaches to engineer injectable hydrogels towards improved osteochondral tissue repair. Herein, we focus on understanding the biology of osteochondral tissue and osteoarthritis along with the need for injectable hydrogels in osteochondral tissue engineering. Furthermore, we discuss in detail different biomaterials (natural and synthetic) and various advanced fabrication methods being employed for the development of injectable hydrogels in osteochondral repair. In addition, in vitro and in vivo applications of developed injectable hydrogels for osteochondral tissue engineering are also reviewed. Finally, conclusions and future perspectives of using injectable hydrogels in osteochondral tissue engineering are provided.
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Affiliation(s)
- Yogendra Pratap Singh
- Biomaterial and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
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Gsib O, Duval JL, Goczkowski M, Deneufchatel M, Fichet O, Larreta-Garde V, Bencherif SA, Egles C. Evaluation of Fibrin-Based Interpenetrating Polymer Networks as Potential Biomaterials for Tissue Engineering. NANOMATERIALS (BASEL, SWITZERLAND) 2017; 7:E436. [PMID: 29232876 PMCID: PMC5746926 DOI: 10.3390/nano7120436] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 11/30/2017] [Accepted: 12/05/2017] [Indexed: 12/14/2022]
Abstract
Interpenetrating polymer networks (IPNs) have gained great attention for a number of biomedical applications due to their improved properties compared to individual components alone. In this study, we investigated the capacity of newly-developed naturally-derived IPNs as potential biomaterials for tissue engineering. These IPNs combine the biologic properties of a fibrous fibrin network polymerized at the nanoscale and the mechanical stability of polyethylene oxide (PEO). First, we assessed their cytotoxicity in vitro on L929 fibroblasts. We further evaluated their biocompatibility ex vivo with a chick embryo organotypic culture model. Subcutaneous implantations of the matrices were subsequently conducted on nude mice to investigate their biocompatibility in vivo. Our preliminary data highlighted that our biomaterials were non-cytotoxic (viability above 90%). The organotypic culture showed that the IPN matrices induced higher cell adhesion (across all the explanted organ tissues) and migration (skin, intestine) than the control groups, suggesting the advantages of using a biomimetic, yet mechanically-reinforced IPN-based matrix. We observed no major inflammatory response up to 12 weeks post implantation. All together, these data suggest that these fibrin-based IPNs are promising biomaterials for tissue engineering.
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Affiliation(s)
- Olfat Gsib
- Laboratoire de BioMécanique et de BioIngénierie (BMBI) UMR CNRS 7388, Sorbonne Universités, Université de Technologie of Compiègne (UTC), 60200 Compiègne, France.
| | - Jean-Luc Duval
- Laboratoire de BioMécanique et de BioIngénierie (BMBI) UMR CNRS 7388, Sorbonne Universités, Université de Technologie of Compiègne (UTC), 60200 Compiègne, France.
| | - Mathieu Goczkowski
- Equipe de Recherche sur les Relations Matrice Extracellulaire Cellules (Errmece), Institut des Matériaux, Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France.
| | - Marie Deneufchatel
- Equipe de Recherche sur les Relations Matrice Extracellulaire Cellules (Errmece), Institut des Matériaux, Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France.
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI), Institut des Matériaux, Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France.
| | - Odile Fichet
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI), Institut des Matériaux, Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France.
| | - Véronique Larreta-Garde
- Equipe de Recherche sur les Relations Matrice Extracellulaire Cellules (Errmece), Institut des Matériaux, Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France.
| | - Sidi Ahmed Bencherif
- Laboratoire de BioMécanique et de BioIngénierie (BMBI) UMR CNRS 7388, Sorbonne Universités, Université de Technologie of Compiègne (UTC), 60200 Compiègne, France.
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
- Department of Chemical Engineering, Northeastern University, 360 Huntington Avenue, Boston, MA 02215, USA.
| | - Christophe Egles
- Laboratoire de BioMécanique et de BioIngénierie (BMBI) UMR CNRS 7388, Sorbonne Universités, Université de Technologie of Compiègne (UTC), 60200 Compiègne, France.
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Radhakrishnan J, Subramanian A, Krishnan UM, Sethuraman S. Injectable and 3D Bioprinted Polysaccharide Hydrogels: From Cartilage to Osteochondral Tissue Engineering. Biomacromolecules 2016; 18:1-26. [PMID: 27966916 DOI: 10.1021/acs.biomac.6b01619] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Biomechanical performance of functional cartilage is executed by the exclusive anisotropic composition and spatially varying intricate architecture in articulating ends of diarthrodial joint. Osteochondral tissue constituting the articulating ends comprise superfical soft cartilage over hard subchondral bone sandwiching interfacial soft-hard tissue. The shock-absorbent, lubricating property of cartilage and mechanical stability of subchondral bone regions are rendered by extended chemical structure of glycosaminoglycans and mineral deposition, respectively. Extracellular matrix glycosaminoglycans analogous polysaccharides are major class of hydrogels investigated for restoration of functional cartilage. Recently, injectable hydrogels have gained momentum as it offers patient compliance, tunable mechanical properties, cell deliverability, and facile administration at physiological condition with long-term functionality and hyaline cartilage construction. Interestingly, facile modifiable functional groups in carbohydrate polymers impart tailorability of desired physicochemical properties and versatile injectable chemistry for the development of highly potent biomimetic in situ forming scaffold. The scaffold design strategies have also evolved from single component to bi- or multilayered and graded constructs with osteogenic properties for deep subchondral regeneration. This review highlights the significance of polysaccharide structure-based functions in engineering cartilage tissue, injectable chemistries, strategies for combining analogous matrices with cells/stem cells and biomolecules and multicomponent approaches for osteochondral mimetic constructs. Further, the rheology and precise spatiotemporal positioning of cells in hydrogel bioink for rapid prototyping of complex three-dimensional anisotropic cartilage have also been discussed.
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Affiliation(s)
- Janani Radhakrishnan
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, India
| | - Anuradha Subramanian
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, India
| | - Uma Maheswari Krishnan
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, India
| | - Swaminathan Sethuraman
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, India
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Gerrah R, Sunstrom Pa-C RE, Hohimer AR. Pretreatment of synthetic vascular grafts with heparin before implantation, a simple technique to reduce the risk of thrombosis. Vascular 2014; 23:513-8. [PMID: 25406265 DOI: 10.1177/1708538114560455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Thrombosis of synthetic grafts commonly used in cardiovascular surgery is a major complication. We examined whether pretreatment of the graft with heparin reduces the risk of early thrombosis. A circuit was assembled to compare two pairs of shunts simultaneously in the same animal. The study shunts were pretreated with heparin. After 2 hours of circulation, clot formation was evaluated by image analysis techniques. The pretreated grafts had fewer blood clots adhered to the surface by direct visual inspection. The image analysis showed 5 vs. 39 clots, 0.01% vs. 1.8% clotted area, and 62 vs. 5630 clot pixel area between the treated and non-treated grafts respectively, p < 0.05. Pretreatment of the synthetic graft with heparin prior to implantation reduces the risk of early clot formation. This simple practice might be helpful to prevent initial thrombosis of the graft and later occlusion.
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Affiliation(s)
- Rabin Gerrah
- Division of Cardiothoracic Surgery, Department of Surgery, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | | | - Alan R Hohimer
- Division of Maternal/Fetal Medicine, Oregon Health and Science University, Portland, OR, USA
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7
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Zaveri TD, Lewis JS, Dolgova NV, Clare-Salzler MJ, Keselowsky BG. Integrin-directed modulation of macrophage responses to biomaterials. Biomaterials 2014; 35:3504-15. [PMID: 24462356 PMCID: PMC3970928 DOI: 10.1016/j.biomaterials.2014.01.007] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 01/07/2014] [Indexed: 01/08/2023]
Abstract
Macrophages are the primary mediator of chronic inflammatory responses to implanted biomaterials, in cases when the material is either in particulate or bulk form. Chronic inflammation limits the performance and functional life of numerous implanted medical devices, and modulating macrophage interactions with biomaterials to mitigate this response would be beneficial. The integrin family of cell surface receptors mediates cell adhesion through binding to adhesive proteins nonspecifically adsorbed onto biomaterial surfaces. In this work, the roles of integrin Mac-1 (αMβ2) and RGD-binding integrins were investigated using model systems for both particulate and bulk biomaterials. Specifically, the macrophage functions of phagocytosis and inflammatory cytokine secretion in response to a model particulate material, polystyrene microparticles were investigated. Opsonizing proteins modulated microparticle uptake, and integrin Mac-1 and RGD-binding integrins were found to control microparticle uptake in an opsonin-dependent manner. The presence of adsorbed endotoxin did not affect microparticle uptake levels, but was required for the production of inflammatory cytokines in response to microparticles. Furthermore, it was demonstrated that integrin Mac-1 and RGD-binding integrins influence the in vivo foreign body response to a bulk biomaterial, subcutaneously implanted polyethylene terephthalate. A thinner foreign body capsule was formed when integrin Mac-1 was absent (~30% thinner) or when RGD-binding integrins were blocked by controlled release of a blocking peptide (~45% thinner). These findings indicate integrin Mac-1 and RGD-binding integrins are involved and may serve as therapeutic targets to mitigate macrophage inflammatory responses to both particulate and bulk biomaterials.
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Affiliation(s)
- Toral D Zaveri
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Jamal S Lewis
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Natalia V Dolgova
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Michael J Clare-Salzler
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL 32611, USA
| | - Benjamin G Keselowsky
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA.
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Santos TC, Morton TJ, Moritz M, Pfeifer S, Reise K, Marques AP, Castro AG, Reis RL, van Griensven M. Vascular Endothelial Growth Factor and Fibroblast Growth Factor-2 Incorporation in Starch-Based Bone Tissue-Engineered Constructs Promote theIn VivoExpression of Neovascularization Mediators. Tissue Eng Part A 2013; 19:834-48. [DOI: 10.1089/ten.tea.2010.0741] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- Tírcia C. Santos
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Tatjana J. Morton
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Martina Moritz
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Sabine Pfeifer
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Kathrin Reise
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Alexandra P. Marques
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - António G. Castro
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Braga, Portugal
| | - Rui L. Reis
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Taipas, Guimarães, Portugal
- ICVS-3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Martijn van Griensven
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Vienna, Austria
- Department of Trauma Surgery, Institute for Experimental Trauma Surgery, Technical University Munich, Munich, Germany
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Li J, Lin F, Li L, Li J, Liu S. Surface Engineering of Poly(ethylene terephthalate) for Durable Hemocompatibility via a Surface Interpenetrating Network Technique. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200251] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Dhahri M, Abed A, Lajimi RH, Mansour MB, Gueguen V, Abdesselem SB, Chaubet F, Letourneur D, Meddahi-Pellé A, Maaroufi RM. Grafting of dermatan sulfate on polyethylene terephtalate to enhance biointegration. J Biomed Mater Res A 2011; 98:114-21. [DOI: 10.1002/jbm.a.33077] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 11/17/2010] [Accepted: 01/11/2011] [Indexed: 11/09/2022]
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Pařízek M, Novotná K, Bačáková L. The role of smooth muscle cells in vessel wall pathophysiology and reconstruction using bioactive synthetic polymers. Physiol Res 2011; 60:419-37. [PMID: 21401306 DOI: 10.33549/physiolres.932038] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
This review summarizes recent trends in the construction of bioartificial vascular replacements, i.e. hybrid grafts containing synthetic polymeric scaffolds and cells. In these advanced replacements, vascular smooth muscle cells (VSMC) should be considered as a physiological component, although it is known that activation of the migration and proliferation of VSMC plays an important role in the onset and development of vascular diseases, and also in restenosis of currently used vascular grafts. Therefore, in novel bioartificial vascular grafts, VSMCs should be kept in quiescent mature contractile phenotype. This can be achieved by (1) appropriate physical and chemical properties of the material, such as its chemical composition, polarity, wettability, surface roughness and topography, electrical charge and conductivity, functionalization with biomolecules and mechanical properties, (2) appropriate cell culture conditions, such as composition of cell culture media and dynamic load, namely cyclic strain, and (3) the presence of a confluent, mature, semipermeable, non-thrombogenic and non-immunogenic endothelial cell (EC) barrier, covering the luminal surface of the graft and separating the VSMCs from the blood. Both VSMCs and ECs can also be differentiated from stem and progenitor cells of various sources. In the case of degradable scaffolds, the material will gradually be removed by the cells and will be replaced by their own new extracellular matrix. Thus, the material component in advanced blood vessel substitutes acts as a temporary scaffold that promotes regeneration of the damaged vascular tissue.
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Affiliation(s)
- M Pařízek
- Department of Growth and Differentiation of Cell Populations, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Spiller D, Mirtelli C, Losi P, Briganti E, Sbrana S, Counoupas S, Kull S, Tonlorenzi S, Soldani G. In vitro evaluation of the PEtU-PDMS material immunocompatibility: the influence of surface topography and PDMS content. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:2511-2520. [PMID: 19756971 DOI: 10.1007/s10856-009-3823-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 07/14/2009] [Indexed: 05/28/2023]
Abstract
The aim of the present work is to evaluate the in vitro immunocompatibility of an elastomeric material with feasible applications in the cardiovascular field. In particular, since it is well known that surface chemistry and topography play a key role in the foreign body response, their influence on human monocytes was evaluated. The material, constituted by a poly(ether)urethane (PEtU) and a polydimethylsiloxane (PDMS), was synthesized to manufacture films and small-diameter vascular grafts with three different surface topographical features, smooth, rough and porous, and siloxane rates, 10, 30 and 40. Human THP-1 monocytes have been cultured for 72 h on the films and human blood has been circulating for 2 h into the grafts to assess leukocyte adhesion and cytokine releases. Materials extracts were utilized to evaluate monocyte apoptosis. Smooth films showed lower cell adhesion degrees than rough and porous ones. All the PEtU-PDMS (poly(ether)urethane-polydimethylsiloxane) films and vascular grafts induced a narrow inflammatory response, as demonstrated by slight cytokine secretion levels, in particular samples with the highest PDMS contents (30 and 40%) induced the lowest IL-1b secretion. Moreover, an absence of monocyte apoptosis advises that the negligible release values have not to be ascribed to material toxicity. In the end, surface topography showed to affect only monocyte adhesion while siloxane content the cytokine release. Therefore, the possibility to modify the above tested parameters during material synthesis and manufacture could allow to bound the inflammatory potency of the PEtU-PDMS devices and render them excellent candidates for cardiovascular reconstruction.
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Affiliation(s)
- D Spiller
- Istituto di Fisiologia Clinica del Consiglio Nazionale delle Ricerche (IFC-CNR), Ospedale G. Pasquinucci, Massa, Italy.
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