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Rudnik M, Hukara A, Kocherova I, Jordan S, Schniering J, Milleret V, Ehrbar M, Klingel K, Feghali-Bostwick C, Distler O, Błyszczuk P, Kania G. Elevated Fibronectin Levels in Profibrotic CD14 + Monocytes and CD14 + Macrophages in Systemic Sclerosis. Front Immunol 2021; 12:642891. [PMID: 34504485 PMCID: PMC8421541 DOI: 10.3389/fimmu.2021.642891] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 07/21/2021] [Indexed: 12/15/2022] Open
Abstract
Background Systemic sclerosis (SSc) is an autoimmune disease characterized by overproduction of extracellular matrix (ECM) and multiorgan fibrosis. Animal studies pointed to bone marrow-derived cells as a potential source of pathological ECM-producing cells in immunofibrotic disorders. So far, involvement of monocytes and macrophages in the fibrogenesis of SSc remains poorly understood. Methods and Results Immunohistochemistry analysis showed accumulation of CD14+ monocytes in the collagen-rich areas, as well as increased amount of alpha smooth muscle actin (αSMA)-positive fibroblasts, CD68+ and mannose-R+ macrophages in the heart and lungs of SSc patients. The full genome transcriptomics analyses of CD14+ blood monocytes revealed dysregulation in cytoskeleton rearrangement, ECM remodeling, including elevated FN1 (gene encoding fibronectin) expression and TGF-β signalling pathway in SSc patients. In addition, single cell RNA sequencing analysis of tissue-resident CD14+ pulmonary macrophages demonstrated activated profibrotic signature with the elevated FN1 expression in SSc patients with interstitial lung disease. Peripheral blood CD14+ monocytes obtained from either healthy subjects or SSc patients exposed to profibrotic treatment with profibrotic cytokines TGF-β, IL-4, IL-10, and IL-13 increased production of type I collagen, fibronectin, and αSMA. In addition, CD14+ monocytes co-cultured with dermal fibroblasts obtained from SSc patients or healthy individuals acquired a spindle shape and further enhanced production of profibrotic markers. Pharmacological blockade of the TGF-β signalling pathway with SD208 (TGF-β receptor type I inhibitor), SIS3 (Smad3 inhibitor) or (5Z)-7-oxozeaenol (TGF-β-activated kinase 1 inhibitor) ameliorated fibronectin levels and type I collagen secretion. Conclusions Our findings identified activated profibrotic signature with elevated production of profibrotic fibronectin in CD14+ monocytes and CD14+ pulmonary macrophages in SSc and highlighted the capability of CD14+ monocytes to acquire a profibrotic phenotype. Taking together, tissue-infiltrating CD14+ monocytes/macrophages can be considered as ECM producers in SSc pathogenesis.
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Affiliation(s)
- Michał Rudnik
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Amela Hukara
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ievgeniia Kocherova
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Suzana Jordan
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Janine Schniering
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Vincent Milleret
- Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland
| | - Martin Ehrbar
- Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland
| | - Karin Klingel
- Department of Molecular Pathology, University Hospital Tuebingen, Tuebingen, Germany
| | - Carol Feghali-Bostwick
- Division of Rheumatology, Medical University of South Carolina, Charleston, SC, United States
| | - Oliver Distler
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Przemysław Błyszczuk
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.,Department of Clinical Immunology, Jagiellonian University Medical College, Krakow, Poland
| | - Gabriela Kania
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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de Leeuw SM, Davaz S, Wanner D, Milleret V, Ehrbar M, Gietl A, Tackenberg C. Increased maturation of iPSC-derived neurons in a hydrogel-based 3D culture. J Neurosci Methods 2021; 360:109254. [PMID: 34126141 DOI: 10.1016/j.jneumeth.2021.109254] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 05/20/2021] [Accepted: 06/09/2021] [Indexed: 11/18/2022]
Abstract
BACKGROUND Induced pluripotent stem cells (iPSCs) can be differentiated into virtually every desired cell type, offering significant potential for modeling human diseases in vitro. A disadvantage is that iPSC-derived cells represent an immature, which presents a major limitation for modeling age-related diseases such as Alzheimer's disease. Evidence suggests that culturing iPSC neurons in a 3D environment may increase neuronal maturity. However, current 3D cell culture systems are cumbersome and time-consuming. NEW METHOD We cultured iPSC-derived excitatory neurons in 3D precast hydrogel plates and compared their maturation to 2D monolayer cultures. COMPARISON WITH EXISTING METHODS In contrast to other hydrogel-based 3D culture techniques, which require full encapsulation of cells, our hydrogel allows the seeded iPSCs and iPSC neurons to simply infiltrate the gel. RESULTS IPSC-neurons grew to a depth of 500 µm into the hydrogel. Cell viability was comparable to 2D cultures over the course of three weeks, with even better neuronal survival in 3D cultures at the one-week time point. Levels of neuronal and synaptic maturation markers, namely, neural cell adhesion molecule 1 (NCAM1) and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor subunit GluR2, were strongly increased in 3D cultures. Furthermore, we identified 4-repeat (4R) tau in 3D cultures, which was not detectable in 2D cultures. CONCLUSIONS We describe a simple, hydrogel-based method for 3D iPSC culture that can serve as a fast and drug-screening-compatible platform to identify new mechanisms and therapeutic targets for brain diseases. We further provided evidence for the increased maturation of iPSC neurons in a 3D microenvironment.
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Affiliation(s)
- Sherida M de Leeuw
- Institute for Regenerative Medicine, University of Zurich, Schlieren, Switzerland; Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Stephanie Davaz
- Institute for Regenerative Medicine, University of Zurich, Schlieren, Switzerland
| | - Debora Wanner
- Institute for Regenerative Medicine, University of Zurich, Schlieren, Switzerland
| | - Vincent Milleret
- Department of Obstetrics, University and University Hospital of Zurich, Zurich, Switzerland
| | - Martin Ehrbar
- Department of Obstetrics, University and University Hospital of Zurich, Zurich, Switzerland
| | - Anton Gietl
- Institute for Regenerative Medicine, University of Zurich, Schlieren, Switzerland
| | - Christian Tackenberg
- Institute for Regenerative Medicine, University of Zurich, Schlieren, Switzerland; Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland.
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3
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Lienemann PS, Vallmajo‐Martin Q, Papageorgiou P, Blache U, Metzger S, Kiveliö A, Milleret V, Sala A, Hoehnel S, Roch A, Reuten R, Koch M, Naveiras O, Weber FE, Weber W, Lutolf MP, Ehrbar M. Smart Hydrogels for the Augmentation of Bone Regeneration by Endogenous Mesenchymal Progenitor Cell Recruitment. Adv Sci (Weinh) 2020; 7:1903395. [PMID: 32274319 PMCID: PMC7141038 DOI: 10.1002/advs.201903395] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/27/2019] [Indexed: 04/14/2023]
Abstract
The treatment of bone defects with recombinant bone morphogenetic protein-2 (BMP-2) requires high doses precluding broad clinical application. Here, a bioengineering approach is presented that strongly improves low-dose BMP-2-based bone regeneration by mobilizing healing-associated mesenchymal progenitor cells (MPCs). Smart synthetic hydrogels are used to trap and study endogenous MPCs trafficking to bone defects. Hydrogel-trapped and prospectively isolated MPCs differentiate into multiple lineages in vitro and form bone in vivo. In vitro screenings reveal that platelet-derived growth factor BB (PDGF-BB) strongly recruits prospective MPCs making it a promising candidate for the engineering of hydrogels that enrich endogenous MPCs in vivo. However, PDGF-BB inhibits BMP-2-mediated osteogenesis both in vitro and in vivo. In contrast, smart two-way dynamic release hydrogels with fast-release of PDGF-BB and sustained delivery of BMP-2 beneficially promote the healing of bone defects. Collectively, it is shown that modulating the dynamics of endogenous progenitor cells in vivo by smart synthetic hydrogels significantly improves bone healing and holds great potential for other advanced applications in regenerative medicine.
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Affiliation(s)
- Philipp S. Lienemann
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Queralt Vallmajo‐Martin
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Panagiota Papageorgiou
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
| | - Ulrich Blache
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
| | - Stéphanie Metzger
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Anna‐Sofia Kiveliö
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Vincent Milleret
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
| | - Ana Sala
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
| | - Sylke Hoehnel
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Aline Roch
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Raphael Reuten
- Institute for Dental Research and Oral Musculoskeletal BiologyCenter for BiochemistryUniversity of CologneCologne50931Germany
| | - Manuel Koch
- Institute for Dental Research and Oral Musculoskeletal BiologyCenter for BiochemistryUniversity of CologneCologne50931Germany
| | - Olaia Naveiras
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Franz E. Weber
- Department of Cranio‐Maxillofacial SurgeryOral Biotechnology and BioengineeringUniversity Hospital ZurichFrauenklinikstrasse 24Zurich8091Switzerland
| | - Wilfried Weber
- Faculty of Biology and BIOSS Centre for Biological Signalling StudiesUniversity of FreiburgSchänzlestr. 18Freiburg79104Germany
| | - Matthias P. Lutolf
- Institute of BioengineeringSchool of Life Sciences and School of EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)Station 15Lausanne1015Switzerland
| | - Martin Ehrbar
- Department of ObstetricsUniversity Hospital ZurichUniversity of ZurichSchmelzbergstr. 12Zurich8091Switzerland
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Milleret V, Lienemann PS, Bauer S, Ehrbar M. Quantitative in vitro comparison of the thrombogenicity of commercial dental implants. Clin Implant Dent Relat Res 2019; 21 Suppl 1:8-14. [DOI: 10.1111/cid.12737] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/22/2019] [Accepted: 01/23/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Vincent Milleret
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital ZurichUniversity of Zurich Zurich Switzerland
| | - Philipp S. Lienemann
- Nobel Biocare AGProduct Development Regeneratives & Biologics Kloten Switzerland
| | - Sebastian Bauer
- Nobel Biocare AGMaterials Research & Surface Technologies Kloten Switzerland
| | - Martin Ehrbar
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital ZurichUniversity of Zurich Zurich Switzerland
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5
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Milleret V, Lienemann PS, Gasser A, Bauer S, Ehrbar M, Wennerberg A. Rational design and in vitro characterization of novel dental implant and abutment surfaces for balancing clinical and biological needs. Clin Implant Dent Relat Res 2019; 21 Suppl 1:15-24. [DOI: 10.1111/cid.12736] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/23/2019] [Accepted: 01/29/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Vincent Milleret
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital ZurichUniversity of Zurich Zurich Switzerland
| | - Philipp S. Lienemann
- Product Development Regeneratives & BiologicsNobel Biocare AG Kloten Switzerland
| | - Angelines Gasser
- Product Development Regeneratives & BiologicsNobel Biocare AG Kloten Switzerland
| | - Sebastian Bauer
- Material Research and Surface TechnologiesNobel Biocare AG Kloten Switzerland
| | - Martin Ehrbar
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital ZurichUniversity of Zurich Zurich Switzerland
| | - Ann Wennerberg
- Department of Prosthodontics, Institute of Odontology, Sahlgrenska AcademyUniversity of Gothenburg Göteborg Sweden
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6
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Blache U, Vallmajo-Martin Q, Horton ER, Guerrero J, Djonov V, Scherberich A, Erler JT, Martin I, Snedeker JG, Milleret V, Ehrbar M. Notch-inducing hydrogels reveal a perivascular switch of mesenchymal stem cell fate. EMBO Rep 2018; 19:embr.201845964. [PMID: 29967223 DOI: 10.15252/embr.201845964] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 06/01/2018] [Accepted: 06/08/2018] [Indexed: 12/26/2022] Open
Abstract
The fate of mesenchymal stem cells (MSCs) in the perivascular niche, as well as factors controlling their fate, is poorly understood. Here, we study MSCs in the perivascular microenvironment of endothelial capillaries by modifying a synthetic 3D biomimetic poly(ethylene glycol) (PEG)-hydrogel system in vitro We show that MSCs together with endothelial cells form micro-capillary networks specifically in soft PEG hydrogels. Transcriptome analysis of human MSCs isolated from engineered capillaries shows a prominent switch in extracellular matrix (ECM) production. We demonstrate that the ECM phenotypic switch of MSCs can be recapitulated in the absence of endothelial cells by functionalizing PEG hydrogels with the Notch-activator Jagged1. Moreover, transient culture of MSCs in Notch-inducing microenvironments reveals the reversibility of this ECM switch. These findings provide insight into the perivascular commitment of MSCs by use of engineered niche-mimicking synthetic hydrogels.
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Affiliation(s)
- Ulrich Blache
- Department of Obstetrics, University Hospital of Zurich, Zurich, Switzerland.,Institute for Biomechanics, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland
| | - Queralt Vallmajo-Martin
- Department of Obstetrics, University Hospital of Zurich, Zurich, Switzerland.,Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Edward R Horton
- Biotech Research and Innovation Centre, University of Copenhagen, Copenhagen, Denmark
| | - Julien Guerrero
- Department of Biomedicine and Department of Surgery, University Hospital Basel, Basel, Switzerland
| | | | - Arnaud Scherberich
- Department of Biomedicine and Department of Surgery, University Hospital Basel, Basel, Switzerland
| | - Janine T Erler
- Biotech Research and Innovation Centre, University of Copenhagen, Copenhagen, Denmark
| | - Ivan Martin
- Department of Biomedicine and Department of Surgery, University Hospital Basel, Basel, Switzerland
| | - Jess G Snedeker
- Institute for Biomechanics, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland.,Biomechanics Laboratory, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - Vincent Milleret
- Department of Obstetrics, University Hospital of Zurich, Zurich, Switzerland
| | - Martin Ehrbar
- Department of Obstetrics, University Hospital of Zurich, Zurich, Switzerland
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7
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Kolandaivelu K, Bailey L, Buzzi S, Zucker A, Milleret V, Ziogas A, Ehrbar M, Khattab AA, Stanley JRL, Wong GK, Zani B, Markham PM, Tzafriri AR, Bhatt DL, Edelman ER. Ultra-hydrophilic stent platforms promote early vascular healing and minimise late tissue response: a potential alternative to second-generation drug-eluting stents. EUROINTERVENTION 2017; 12:2148-2156. [PMID: 27993749 DOI: 10.4244/eij-d-15-00497] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIMS Simple surface modifications can enhance coronary stent performance. Ultra-hydrophilic surface (UHS) treatment of contemporary bare metal stents (BMS) was assessed in vivo to verify whether such stents can provide long-term efficacy comparable to second-generation drug-eluting stents (DES) while promoting healing comparably to BMS. METHODS AND RESULTS UHS-treated BMS, untreated BMS and corresponding DES were tested for three commercial platforms. A thirty-day and a 90-day porcine coronary model were used to characterise late tissue response. Three-day porcine coronary and seven-day rabbit iliac models were used for early healing assessment. In porcine coronary arteries, hydrophilic treatment reduced intimal hyperplasia relative to the BMS and corresponding DES platforms (1.5-fold to threefold reduction in 30-day angiographic and histological stenosis; p<0.04). Endothelialisation was similar on UHS-treated BMS and untreated BMS, both in swine and rabbit models, and lower on DES. Elevation in thrombotic indices was infrequent (never observed with UHS, rare with BMS, most often with DES), but, when present, correlated with reduced endothelialisation (p<0.01). CONCLUSIONS Ultra-hydrophilic surface treatment of contemporary stents conferred good healing while moderating neointimal and thrombotic responses. Such surfaces may offer safe alternatives to DES, particularly when rapid healing and short dual antiplatelet therapy (DAPT) are crucial.
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Affiliation(s)
- Kumaran Kolandaivelu
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, USA
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Zhang N, Milleret V, Thompson-Steckel G, Huang NP, Vörös J, Simona BR, Ehrbar M. Soft Hydrogels Featuring In-Depth Surface Density Gradients for the Simple Establishment of 3D Tissue Models for Screening Applications. SLAS Discov 2017; 22:635-644. [PMID: 28277889 DOI: 10.1177/2472555217693191] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Three-dimensional (3D) cell culture models are gaining increasing interest for use in drug development pipelines due to their closer resemblance to human tissues. Hydrogels are the first-choice class of materials to recreate in vitro the 3D extra-cellular matrix (ECM) environment, important in studying cell-ECM interactions and 3D cellular organization and leading to physiologically relevant in vitro tissue models. Here we propose a novel hydrogel platform consisting of a 96-well plate containing pre-cast synthetic PEG-based hydrogels for the simple establishment of 3D (co-)culture systems without the need for the standard encapsulation method. The in-depth density gradient at the surface of the hydrogel promotes the infiltration of cells deposited on top of it. The ability to decouple hydrogel production and cell seeding is intended to simplify the use of hydrogel-based platforms and thus increase their accessibility. Using this platform, we established 3D cultures relevant for studying stem cell differentiation, angiogenesis, and neural and cancer models.
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Affiliation(s)
- Ning Zhang
- 1 Laboratory of Biosensors and Bioelectronics, University and ETH Zurich, Zurich, Switzerland.,2 State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Vincent Milleret
- 3 Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland.,4 Ectica Technologies AG, Zurich, Switzerland
| | - Greta Thompson-Steckel
- 1 Laboratory of Biosensors and Bioelectronics, University and ETH Zurich, Zurich, Switzerland
| | - Ning-Ping Huang
- 2 State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - János Vörös
- 1 Laboratory of Biosensors and Bioelectronics, University and ETH Zurich, Zurich, Switzerland
| | | | - Martin Ehrbar
- 3 Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland
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9
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Evrova O, Hosseini V, Milleret V, Palazzolo G, Zenobi-Wong M, Sulser T, Buschmann J, Eberli D. Hybrid Randomly Electrospun Poly(lactic-co-glycolic acid):Poly(ethylene oxide) (PLGA:PEO) Fibrous Scaffolds Enhancing Myoblast Differentiation and Alignment. ACS Appl Mater Interfaces 2016; 8:31574-31586. [PMID: 27726370 DOI: 10.1021/acsami.6b11291] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Cellular responses are regulated by their microenvironments, and engineered synthetic scaffolds can offer control over different microenvironment properties. This important relationship can be used as a tool to manipulate cell fate and cell responses for different biomedical applications. We show for the first time in this study how blending of poly(ethylene oxide) (PEO) to poly(lactic-co-glycolic acid) (PLGA) fibers to yield hybrid scaffolds changes the physical and mechanical properties of PLGA fibrous scaffolds and in turn affects cellular response. For this purpose we employed electrospinning to create fibrous scaffolds mimicking the basic structural properties of the native extracellular matrix. We introduced PEO to PLGA electrospun fibers by spinning a blend of PLGA:PEO polymer solutions in different ratios. PEO served as a sacrificial component within the fibers upon hydration, leading to pore formation in the fibers, fiber twisting, increased scaffold disintegration, and hydrophilicity, decreased Young's modulus, and significantly improved strain at break of initially electrospun scaffolds. We observed that the blended PLGA:PEO fibrous scaffolds supported myoblast adhesion and proliferation and resulted in increased myotube formation and self-alignment, when compared to PLGA-only scaffolds, even though the scaffolds were randomly oriented. The 50:50 PLGA:PEO blended scaffold showed the most promising results in terms of mechanical properties, myotube formation, and alignment, suggesting an optimal microenvironment for myoblast differentiation from the PLGA:PEO blends tested. The explored approach for tuning fiber properties can easily extend to other polymeric scaffolds and provides a valuable tool to engineer fibrillar microenvironments for several biomedical applications.
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Affiliation(s)
- Olivera Evrova
- Division of Plastic Surgery and Hand Surgery, University Hospital Zürich , Sternwartstrasse 14, 8091 Zürich, Switzerland
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology and Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, University Hospital Zürich , Frauenklinikstrasse 10, 8091 Zürich, Switzerland
| | - Vahid Hosseini
- Laboratory of Applied Mechanobiology, ETH Zürich , Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland
| | - Vincent Milleret
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics, University Hospital Zürich , Schmelzbergstrasse 12/PF 125, 8091 Zürich, Switzerland
| | - Gemma Palazzolo
- Cartilage Engineering and Regeneration, ETH Zürich , Otto-Stern-Weg 7, 8093 Zürich, Switzerland
| | - Marcy Zenobi-Wong
- Cartilage Engineering and Regeneration, ETH Zürich , Otto-Stern-Weg 7, 8093 Zürich, Switzerland
| | - Tullio Sulser
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology and Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, University Hospital Zürich , Frauenklinikstrasse 10, 8091 Zürich, Switzerland
| | - Johanna Buschmann
- Division of Plastic Surgery and Hand Surgery, University Hospital Zürich , Sternwartstrasse 14, 8091 Zürich, Switzerland
| | - Daniel Eberli
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology and Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, University Hospital Zürich , Frauenklinikstrasse 10, 8091 Zürich, Switzerland
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Horst M, Milleret V, Noetzli S, Gobet R, Sulser T, Eberli D. Polyesterurethane and acellular matrix based hybrid biomaterial for bladder engineering. J Biomed Mater Res B Appl Biomater 2015; 105:658-667. [DOI: 10.1002/jbm.b.33591] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 11/12/2015] [Accepted: 11/18/2015] [Indexed: 01/02/2023]
Affiliation(s)
- Maya Horst
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology; University Hospital Zurich; Zurich Switzerland
- Division of Pediatric Urology; University Children's Hospital; Zurich Switzerland
| | - Vincent Milleret
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics; University Hospital Zurich; Zurich Switzerland
| | - Sarah Noetzli
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology; University Hospital Zurich; Zurich Switzerland
| | - Rita Gobet
- Division of Pediatric Urology; University Children's Hospital; Zurich Switzerland
| | - Tullio Sulser
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology; University Hospital Zurich; Zurich Switzerland
| | - Daniel Eberli
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology; University Hospital Zurich; Zurich Switzerland
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Milleret V, Buzzi S, Gehrig P, Ziogas A, Grossmann J, Schilcher K, Zinkernagel AS, Zucker A, Ehrbar M. Protein adsorption steers blood contact activation on engineered cobalt chromium alloy oxide layers. Acta Biomater 2015; 24:343-51. [PMID: 26102336 DOI: 10.1016/j.actbio.2015.06.020] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 06/12/2015] [Accepted: 06/16/2015] [Indexed: 12/01/2022]
Abstract
Biomaterials upon implantation are immediately covered by blood proteins which direct the subsequent blood activation. These early events determine the following cascade of biological reactions and consequently the long-term success of implants. The ability to modulate surface properties of biomaterials is therefore of considerable clinical significance. Goal of this study was an in-depth understanding of the biological response to cobalt chromium stent alloys with engineered surface oxide layers, which showed altered body reactions in vivo. We analyzed in vitro the biological events following initial blood contact on engineered cobalt chromium surfaces featuring said oxide layers. Surface-specific blood reactions were confirmed by scanning electron microscopy and the adsorbed protein layers were characterized by mass spectrometry. This powerful proteomics tool allowed the identification and quantification of over hundred surface-adhering proteins. Proteins associated with the coagulation cascade, platelet adhesion and neutrophil function correlated with the various blood surface activations observed. Furthermore, results of pre-coated surfaces with defined fibrinogen-albumin mixtures suggest that neutrophil adhesion was controlled by fibrinogen orientation and conformation rather than quantity. This study highlights the importance of controlling the biological response in the complex protein-implant surface interactions and the potential of the surface modifications to improve the clinical performance of medical implants. STATEMENT OF SIGNIFICANCE The blood contact activation of CoCr alloys is determined by their surface oxide layer properties. Modifications of the oxide layer affected the total amount of adsorbed proteins and the composition of the adsorbed protein layer. Additionally fibrinogen coatings mediated the surface-dependent neutrophil adhesion in a concentration-independent manner, indicating the influence of conformation and/or orientation of the adsorbed protein. Despite the complexity of protein-implant interactions, this study highlights the importance of understanding and controlling mechanisms of protein adhesion in order to improve and steer the performance of medical implants. It shows that modification of the surface oxide layer is a very attractive strategy to directly functionalize metallic implant surfaces and optimize their blood interaction for the desired orthopedic or cardiovascular applications.
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Affiliation(s)
- Vincent Milleret
- Department of Obstetrics, University Hospital Zurich, University of Zurich, Switzerland
| | | | - Peter Gehrig
- Functional Genomics Center Zurich, University of Zurich/ETH Zurich, Switzerland
| | - Algirdas Ziogas
- Department of Obstetrics, University Hospital Zurich, University of Zurich, Switzerland
| | - Jonas Grossmann
- Functional Genomics Center Zurich, University of Zurich/ETH Zurich, Switzerland
| | - Katrin Schilcher
- Division of Infectious Diseases and Hospital Epidemiology, University of Zurich, Switzerland
| | - Annelies S Zinkernagel
- Division of Infectious Diseases and Hospital Epidemiology, University of Zurich, Switzerland
| | | | - Martin Ehrbar
- Department of Obstetrics, University Hospital Zurich, University of Zurich, Switzerland.
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12
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Kolandaivelu K, Bailey L, Buzzi S, Zucker A, Ziogas A, Milleret V, Ehrbar M, Khattab AA, Stanley JR, Wong GK, Zani B, Markham PK, Tzafriri AR, Bhatt DL, Edelman ER. CRT-704 Ultra-Hydrophilic Stents Promote Early Healing and Minimize Late Tissue Response: A Potential Alternative to Second-Generation Drug Eluting Stents. JACC Cardiovasc Interv 2015. [DOI: 10.1016/j.jcin.2014.12.174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Simona BR, Hirt L, Demkó L, Zambelli T, Vörös J, Ehrbar M, Milleret V. Density gradients at hydrogel interfaces for enhanced cell penetration. Biomater Sci 2015. [DOI: 10.1039/c4bm00416g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Interfacial crosslinking density gradients represent a simple strategy to overcome the challenge of the limited penetration of cells seeded on the surface of hydrogels. The strategy here-presented can be used both when cells need to be seeded after hydrogel processing and to enable cell migration through hydrogel elements additively manufactured.
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Affiliation(s)
- B. R. Simona
- Laboratory of Biosensors and Bioelectronics
- Institute for Biomedical Engineering
- University and ETH Zurich
- Zurich
- Switzerland
| | - L. Hirt
- Laboratory of Biosensors and Bioelectronics
- Institute for Biomedical Engineering
- University and ETH Zurich
- Zurich
- Switzerland
| | - L. Demkó
- Laboratory of Biosensors and Bioelectronics
- Institute for Biomedical Engineering
- University and ETH Zurich
- Zurich
- Switzerland
| | - T. Zambelli
- Laboratory of Biosensors and Bioelectronics
- Institute for Biomedical Engineering
- University and ETH Zurich
- Zurich
- Switzerland
| | - J. Vörös
- Laboratory of Biosensors and Bioelectronics
- Institute for Biomedical Engineering
- University and ETH Zurich
- Zurich
- Switzerland
| | - M. Ehrbar
- Laboratory for Cell and Tissue Engineering
- Department of Obstetrics
- University Hospital Zurich
- 8091 Zurich
- Switzerland
| | - V. Milleret
- Laboratory for Cell and Tissue Engineering
- Department of Obstetrics
- University Hospital Zurich
- 8091 Zurich
- Switzerland
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14
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Lienemann PS, Devaud YR, Reuten R, Simona BR, Karlsson M, Weber W, Koch M, Lutolf MP, Milleret V, Ehrbar M. Locally controlling mesenchymal stem cell morphogenesis by 3D PDGF-BB gradients towards the establishment of an in vitro perivascular niche. Integr Biol (Camb) 2015; 7:101-11. [DOI: 10.1039/c4ib00152d] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We report on the creation of a three dimensional biomimetic tissue model that recapitulates the stable PDGF-BB gradient controlling mesenchymal stem cell morphogenetic behavior in the perivascular niche.
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15
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Milleret V, Ziogas A, Buzzi S, Heuberger R, Zucker A, Ehrbar M. Effect of oxide layer modification of CoCr stent alloys on blood activation and endothelial behavior. J Biomed Mater Res B Appl Biomater 2014; 103:629-40. [DOI: 10.1002/jbm.b.33232] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 05/06/2014] [Accepted: 06/01/2014] [Indexed: 12/14/2022]
Affiliation(s)
- Vincent Milleret
- Department of ObstetricsUniversity Hospital ZurichZurich Switzerland
| | - Algirdas Ziogas
- Department of ObstetricsUniversity Hospital ZurichZurich Switzerland
| | | | | | | | - Martin Ehrbar
- Department of ObstetricsUniversity Hospital ZurichZurich Switzerland
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16
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Milleret V, Simona BR, Lienemann PS, Vörös J, Ehrbar M. Electrochemical control of the enzymatic polymerization of PEG hydrogels: formation of spatially controlled biological microenvironments. Adv Healthc Mater 2014; 3:508-14. [PMID: 24574303 DOI: 10.1002/adhm.201300479] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 09/29/2013] [Indexed: 01/15/2023]
Abstract
Control of pH gradient profile at the electrode-electrolyte interfaces allows the control of the enzymatic PEG-hydrogel polymerization. By tuning the solution pH, buffer capacity, and the applied current, the extent of the local inhibition and confinement of the Factor XIII-mediated polymerization of PEG are controlled. This technology opens new perspectives for the production of 3D-structured biological microenvironments.
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Affiliation(s)
- Vincent Milleret
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics; University Hospital Zurich; Schmelzbergstrasse 12, PATH G 48b 8091 Zurich Switzerland
| | - Benjamin R. Simona
- Laboratory of Biosensors and Bioelectronics; ETH Zurich Zurich Switzerland
| | - Philipp S. Lienemann
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics; University Hospital Zurich; Schmelzbergstrasse 12, PATH G 48b 8091 Zurich Switzerland
- Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL); Station 15, Bld AI 1109 1015 Lausanne Switzerland
| | - János Vörös
- Laboratory of Biosensors and Bioelectronics; ETH Zurich Zurich Switzerland
| | - Martin Ehrbar
- Laboratory for Cell and Tissue Engineering, Department of Obstetrics; University Hospital Zurich; Schmelzbergstrasse 12, PATH G 48b 8091 Zurich Switzerland
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17
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Horst M, Milleret V, Nötzli S, Madduri S, Sulser T, Gobet R, Eberli D. Increased porosity of electrospun hybrid scaffolds improved bladder tissue regeneration. J Biomed Mater Res A 2013; 102:2116-24. [PMID: 23893914 DOI: 10.1002/jbm.a.34889] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 06/29/2013] [Accepted: 07/18/2013] [Indexed: 12/12/2022]
Abstract
The object of this study was to investigate the role of scaffold porosity on tissue ingrowth using hybrid scaffolds consisting of bladder acellular matrix and electrospun poly (lactide-co-glycolide) (PLGA) microfibers that mimic the morphological characteristics of the bladder wall in vitro and in vivo. We compared single-spun (SS) PLGA scaffolds with more porous cospun (CS) scaffolds (PLGA and polyethylene glycol). Scaffolds were characterized by scanning electron microscopy. Bladder smooth muscle cells (SMCs) were seeded, and proliferation and histological assays were performed. Sixteen rats were subjected to augmentation cystoplasty with seeded SS or CS scaffolds, morphological, and histological studies were performed 2 and 4 weeks after implantation. The porosities of SS and CS scaffolds were 73.1 ± 2.9% and 80.9 ± 1.5%, respectively. The in vitro evaluation revealed significantly deeper cell migration into CS scaffolds. The in vivo evaluation showed significant shrinkage of SS scaffolds (p = 0.019). The histological analysis revealed a bladder wall-like structure with urothelial lining and SMC infiltration in both groups. The microvessel density was significantly increased in the CS scaffolds (p < 0.001). Increasing the porosity of electrospun hybrid scaffolds is an effective strategy to enhance cell proliferation and distribution in vitro and tissue ingrowth in vivo.
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Affiliation(s)
- Maya Horst
- Division of Pediatric Urology, University Children's Hospital, 8032, Zurich, Switzerland
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18
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Binder C, Milleret V, Hall H, Eberli D, Lühmann T. Influence of micro and submicro poly(lactic-glycolic acid) fibers on sensory neural cell locomotion and neurite growth. J Biomed Mater Res B Appl Biomater 2013; 101:1200-8. [PMID: 23650277 DOI: 10.1002/jbm.b.32931] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 02/11/2013] [Accepted: 02/17/2013] [Indexed: 01/28/2023]
Abstract
For successful peripheral nerve regeneration, a complex interplay of growth factors, topographical guidance structure by cells and extracellular matrix proteins, are needed. Aligned fibrous biomaterials with a wide variety in fiber diameter have been used successfully to support neuronal guidance. To better understand the importance of size of the topographical features, we investigated the directionality of neuronal migration of sensory ND7/23 cells on aligned electrospun poly(lactic-glycolic acid) PLGA fibers in the range of micrometer and submicrometer diameters by time-lapse microscopy. Cell trajectories of single ND7/23 cells were found to significantly follow topographies of PLGA fibers with micrometer dimensions in contrast to PLGA fibers within the submicrometer range, where cell body movement was observed to be independent of fibrous structures. Moreover, neurite alignment of ND7/23 cells on various topographies was assessed. PLGA fibers with micrometer dimensions significantly aligned 83.3% of all neurites after 1 day of differentiation compared to similar submicrometer structures, which orientated 25.8% of all neurites. Interestingly, after 7 days of differentiation ND7/23 cells on submicrometer PLGA fibers increased their alignment of neurites to 52.5%. Together, aligned PLGA fibers with micrometer dimensions showed a superior influence on directionality of neuronal migration and neurite outgrowth of sensory ND7/23 cells, indicating that electrospun micro-PLGA fibers might represent a potential material to induce directionality of neuronal growth in engineering applications for sensory nerve regeneration.
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Affiliation(s)
- Carmen Binder
- Cells and BioMaterials, Department of Materials, ETH Zurich, Switzerland
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19
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Milleret V, Hefti T, Hall H, Vogel V, Eberli D. Influence of the fiber diameter and surface roughness of electrospun vascular grafts on blood activation. Acta Biomater 2012; 8:4349-56. [PMID: 22842036 DOI: 10.1016/j.actbio.2012.07.032] [Citation(s) in RCA: 129] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 07/18/2012] [Accepted: 07/20/2012] [Indexed: 01/09/2023]
Abstract
Electrospun grafts have been widely investigated for vascular graft replacement due to their ease and compatibility with many natural and synthetic polymers. Here, the effect of the processing parameters on the scaffold's architecture and subsequent reactions of partially heparinized blood triggered by contacting these topographies were studied. Degrapol® (DP) and poly(lactic-co-glycolic acid) (PLGA) electrospun fibrous scaffolds were characterized with regard to fiber diameter, pore area and scaffold roughness. The study showed that electrospinning parameters greatly affect fiber diameter together with pore dimension and overall scaffold roughness. Coagulation cascade activation, early platelet adhesion and activation were analyzed after 2h of exposure of blood to the biomaterials. While no differences were found between DP and PLGA with similar topographies, the blood reactions were observed to be dependent on the fiber diameter and scaffold roughness. Scaffolds composed of thin fibers (diameter <1μm) triggered very low coagulation and almost no platelets adhered. On the other hand, scaffolds with a bigger fiber diameter (2-3μm) triggered higher thrombin formation and more platelets adhered. The highest platelet adhesion and activations rates as well as coagulation cascade activation were found in blood incubated in contact with the scaffolds produced with the biggest fiber diameter (5μm). These findings indicate that electrospun grafts with small fiber diameter (<1μm) could perform better with reduced early thrombogenicity due to lower platelet adhesion and lower activation of platelets and coagulation cascade.
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Affiliation(s)
- Vincent Milleret
- Cells and Biomaterials, Department of Materials, ETH Zurich, Switzerland.
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20
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Horst M, Madduri S, Milleret V, Sulser T, Gobet R, Eberli D. A bilayered hybrid microfibrous PLGA--acellular matrix scaffold for hollow organ tissue engineering. Biomaterials 2012. [PMID: 23177021 DOI: 10.1016/j.biomaterials.2012.10.075] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Various synthetic and natural biomaterials have been used for regeneration of tissues and hollow organs. However, clinical outcome of reconstructive procedures remained challenging due to the lack of appropriate scaffold materials, supporting the needs of various cell types and providing a barrier function required in hollow organs. To address these problems, we have developed a bilayered hybrid scaffold comprising unique traits of polymeric microfibers and naturally derived acellular matrices and tested its potential for hollow organ regeneration in a rat bladder model. Hybrid scaffolds were fabricated by electrospinning of PLGA microfibers directly onto the abluminal surface of a bladder acellular matrix. Stability of this bilayered construct was established using modified spinning technique. The resulting 3-dimensional framework provided good support for growth, attachment and proliferation of primary bladder smooth muscle cells. Histological analysis in vivo at 4 and 8 weeks post implantation, revealed regeneration of bladder tissue structures consisting of urothelium, smooth muscle and collagen rich layers infiltrated with host cells and micro vessels. Furthermore, hybrid scaffolds maintained normal bladder capacity, whereas BAM recipients showed a significant distension of the bladder. These results demonstrate that this adaptable hybrid scaffold supports bladder regeneration and holds potential for engineering of bladder and other hollow organs.
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Affiliation(s)
- Maya Horst
- Tissue Engineering and Stem Cells Therapy, Department of Urology, University Hospital, 8091 Zurich, Switzerland
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21
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Buschmann J, Calcagni M, Bürgisser GM, Bonavoglia E, Neuenschwander P, Milleret V, Giovanoli P. Synthesis, characterization and histomorphometric analysis of cellular response to a new elastic DegraPol® polymer for rabbit Achilles tendon rupture repair. J Tissue Eng Regen Med 2012; 9:584-94. [DOI: 10.1002/term.1624] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 07/04/2012] [Accepted: 08/25/2012] [Indexed: 02/05/2023]
Affiliation(s)
- Johanna Buschmann
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Sternwartstrasse 14 8091 Zurich Switzerland
| | - Maurizio Calcagni
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Sternwartstrasse 14 8091 Zurich Switzerland
| | - Gabriella Meier Bürgisser
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Sternwartstrasse 14 8091 Zurich Switzerland
| | | | | | - Vincent Milleret
- Department of Materials; Cells and Biomaterials; ETH Zurich Zurich Switzerland
| | - Pietro Giovanoli
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Sternwartstrasse 14 8091 Zurich Switzerland
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22
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Bailey L, Groothuis A, Zucker A, Buzzi S, Mäder A, Ziogas A, Milleret V, Ehrbar M, Edelman E. TCT-637 A Novel Bioactive and Coating-Free Stent Surface Exhibits a Reduction in Neointimal Hyperplasia by Decreasing Platelet Aggregation and Promoting Endothelialization. J Am Coll Cardiol 2012. [DOI: 10.1016/j.jacc.2012.08.674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Buschmann J, Meier-Bürgisser G, Bonavoglia E, Neuenschwander P, Milleret V, Giovanoli P, Calcagni M. Cellular response of healing tissue to DegraPol tube implantation in rabbit Achilles tendon rupture repair: anin vivohistomorphometric study. J Tissue Eng Regen Med 2012; 7:413-20. [DOI: 10.1002/term.538] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 09/01/2011] [Accepted: 11/03/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Johanna Buschmann
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Switzerland
| | | | | | | | - Vincent Milleret
- Department of Materials, Cells and Biomaterials; ETH Zurich; Switzerland
| | - Pietro Giovanoli
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Switzerland
| | - Maurizio Calcagni
- Division of Plastic and Reconstructive Surgery; University Hospital Zurich; Switzerland
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Milleret V, Tugulu S, Schlottig F, Hall H. Alkali treatment of microrough titanium surfaces affects macrophage/monocyte adhesion, platelet activation and architecture of blood clot formation. Eur Cell Mater 2011; 21:430-44; discussion 444. [PMID: 21604243 DOI: 10.22203/ecm.v021a32] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Titanium implants are most commonly used for bone augmentation and replacement due to their favorable osseointegration properties. Here, hyperhydrophilic sand-blasted and acid-etched (SBA) titanium surfaces were produced by alkali treatment and their responses to partially heparinized whole human blood were analyzed. Blood clot formation, platelet activation and activation of the complement system was analyzed revealing that exposure time between blood and the material surface is crucial as increasing exposure time results in higher amount of activated platelets, more blood clots formed and stronger complement activation. In contrast, the number of macrophages/monocytes found on alkali-treated surfaces was significantly reduced as compared to untreated SBA Ti surfaces. Interestingly, when comparing untreated to modified SBA Ti surfaces very different blood clots formed on their surfaces. On untreated Ti surfaces blood clots remain thin (below 15 mm), patchy and non-structured lacking large fibrin fiber networks whereas blood clots on differentiated surfaces assemble in an organized and layered architecture of more than 30 mm thickness. Close to the material surface most nucleated cells adhere, above large amounts of non-nucleated platelets remain entrapped within a dense fibrin fiber network providing a continuous cover of the entire surface. These findings might indicate that, combined with findings of previous in vivo studies demonstrating that alkali-treated SBA Ti surfaces perform better in terms of osseointegration, a continuous and structured layer of blood components on the blood-facing surface supports later tissue integration of an endosseous implant.
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Affiliation(s)
- Vincent Milleret
- Cells and BioMaterials, Department of Materials, ETH Zürich, Wolfgang Pauli Strasse 10, HCI E415, 8093 Zurich, Switzerland
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Horst M, Madduri S, Hall H, Milleret V, Gobet R, Sulser T, Eberli D. 426 ELECTROSPUN-ACELLULAR MATRIX COMPOSITE SCAFFOLD FOR BLADDER RECONSTRUCTION. J Urol 2011. [DOI: 10.1016/j.juro.2011.02.516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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26
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Milleret V, Simona B, Neuenschwander P, Hall H, Hall H. Tuning electrospinning parameters for production of 3D-fiber-fleeces with increased porosity for soft tissue engineering applications. Eur Cell Mater 2011; 21:286-303. [PMID: 21432783 DOI: 10.22203/ecm.v021a22] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Degrapol® and PLGA electrospun fiber fleeces were characterized with regard to fiber diameter, alignment, mechanical properties as well as scaffold porosity. The study showed that electrospinning parameters affect fiber diameter and alignment in an inverse relation: fiber diameter was increased with increased flow rate, with decrease in working distance and collector velocity, whereas fiber alignment increased with the working distance and collector velocity but decreased with increased flow rate. When Degrapol® or PLGA-polymers were co-spun with increasing ratios of a water-soluble polymer that was subsequently removed; fibrous scaffolds with increased porosities were obtained. Mechanical properties correlated with fiber alignment rather than fiber diameter as aligned fiber scaffolds demonstrated strong mechanical anisotropy. For co-spun fibers the Young's modulus correlated inversely with the amount of co-spun polymer. Cell proliferation was independent of the porosity of the scaffold, but different between the two polymers. Furthermore, fibrous scaffolds with different porosities were analyzed for cell infiltration suggesting that cell infiltration was enhanced with increased porosity and increasing time. These experiments indicate that 3D-fiber fleeces can be produced with controlled properties, being prerequisites for successful scaffolds in tissue engineering applications.
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Affiliation(s)
- V Milleret
- ETH Zurich, Department of Materials, HCI E415, Cells and BioMaterials, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland
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27
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Milleret V, Simonet M, Bittermann AG, Neuenschwander P, Hall H. Cyto- and hemocompatibility of a biodegradable 3D-scaffold material designed for medical applications. J Biomed Mater Res B Appl Biomater 2009; 91:109-21. [DOI: 10.1002/jbm.b.31379] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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