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Schmid R, Schmidt SK, Schrüfer S, Schubert DW, Heltmann-Meyer S, Schicht M, Paulsen F, Horch RE, Bosserhoff AK, Kengelbach-Weigand A, Arkudas A. A vascularized in vivo melanoma model suitable for metastasis research of different tumor stages using fundamentally different bioinks. Mater Today Bio 2024; 26:101071. [PMID: 38736612 PMCID: PMC11081803 DOI: 10.1016/j.mtbio.2024.101071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 02/12/2024] [Revised: 04/21/2024] [Accepted: 04/25/2024] [Indexed: 05/14/2024] Open
Abstract
Although 2D cancer models have been the standard for drug development, they don't resemble in vivo properties adequately. 3D models can potentially overcome this. Bioprinting is a promising technique for more refined models to investigate central processes in tumor development such as proliferation, dormancy or metastasis. We aimed to analyze bioinks, which could mimic these different tumor stages in a cast vascularized arteriovenous loop melanoma model in vivo. It has the advantage to be a closed system with a defined microenvironment, supplied only with one vessel-ideal for metastasis research. Tested bioinks showed significant differences in composition, printability, stiffness and microscopic pore structure, which led to different tumor stages (Matrigel and Alg/HA/Gel for progression, Cellink Bioink for dormancy) and resulted in different primary tumor growth (Matrigel significantly higher than Cellink Bioink). Light-sheet fluorescence microscopy revealed differences in vascularization and hemorrhages with no additional vessels found in Cellink Bioink. Histologically, typical human melanoma with different stages was demonstrated. HMB-45-positive tumors in progression inks were infiltrated by macrophages (CD163), highly proliferative (Ki67) and metastatic (MITF/BRN2, ATX, MMP3). Stainings of lymph nodes revealed metastases even without significant primary tumor growth in Cellink Bioink. This model can be used to study tumor pathology and metastasis of different tumor stages and therapies.
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Affiliation(s)
- Rafael Schmid
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Sonja K. Schmidt
- Institute of Biochemistry, Friedrich-Alexander University Erlangen-Nürnberg, Fahrstraße 17, 91054, Erlangen, Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
| | - Dirk W. Schubert
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
| | - Stefanie Heltmann-Meyer
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Martin Schicht
- Department of Functional and Clinical Anatomy, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstraße 19, 91054, Erlangen, Germany
| | - Friedrich Paulsen
- Department of Functional and Clinical Anatomy, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstraße 19, 91054, Erlangen, Germany
| | - Raymund E. Horch
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Anja K. Bosserhoff
- Institute of Biochemistry, Friedrich-Alexander University Erlangen-Nürnberg, Fahrstraße 17, 91054, Erlangen, Germany
| | - Annika Kengelbach-Weigand
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Andreas Arkudas
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Krankenhausstraße 12, 91054, Erlangen, Germany
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2
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Roshanbinfar K, Schiffer M, Carls E, Angeloni M, Koleśnik-Gray M, Schruefer S, Schubert DW, Ferrazzi F, Krstić V, Fleischmann BK, Roell W, Engel FB. Electrically Conductive Collagen-PEDOT:PSS Hydrogel Prevents Post-Infarct Cardiac Arrhythmia and Supports hiPSC-Cardiomyocyte Function. Adv Mater 2024:e2403642. [PMID: 38653478 DOI: 10.1002/adma.202403642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Indexed: 04/25/2024]
Abstract
Myocardial infarction (MI) causes cell death, disrupts electrical activity, triggers arrhythmia, and results in heart failure, whereby 50-60% of MI-associated deaths manifest as sudden cardiac deaths (SCD). The most effective therapy for SCD prevention is implantable cardioverter defibrillators (ICDs). However, ICDs contribute to adverse remodeling and disease progression and do not prevent arrhythmia. This work develops an injectable collagen-PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) hydrogel that protects infarcted hearts against ventricular tachycardia (VT) and can be combined with human induced pluripotent stem cell (hiPSC)-cardiomyocytes to promote partial cardiac remuscularization. PEDOT:PSS improves collagen gel formation, micromorphology, and conductivity. hiPSC-cardiomyocytes in collagen-PEDOT:PSS hydrogels exhibit near-adult sarcomeric length, improved contractility, enhanced calcium handling, and conduction velocity. RNA-sequencing data indicate enhanced maturation and improved cell-matrix interactions. Injecting collagen-PEDOT:PSS hydrogels in infarcted mouse hearts decreases VT to the levels of healthy hearts. Collectively, collagen-PEDOT:PSS hydrogels offer a versatile platform for treating cardiac injuries.
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Affiliation(s)
- Kaveh Roshanbinfar
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Miriam Schiffer
- Institute of Physiology I, Life and Brain Center, Medical Faculty, University of Bonn, Germany
| | - Esther Carls
- Department of Cardiac Surgery, UKB, University of Bonn, Germany
| | - Miriam Angeloni
- Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Maria Koleśnik-Gray
- Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 7, 91058, Erlangen, Germany
| | - Stefan Schruefer
- Institute of Polymer Materials, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 7, 91058, Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 7, 91058, Erlangen, Germany
| | - Fulvia Ferrazzi
- Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
- Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Vojislav Krstić
- Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 7, 91058, Erlangen, Germany
| | - Bernd K Fleischmann
- Institute of Physiology I, Life and Brain Center, Medical Faculty, University of Bonn, Germany
| | - Wilhelm Roell
- Department of Cardiac Surgery, UKB, University of Bonn, Germany
| | - Felix B Engel
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
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3
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Vaziri AS, Vasheghani-Farahani E, Hosseinzadeh S, Bagheri F, Büchner M, Schubert DW, Boccaccini AR. Genipin-Cross-Linked Silk Fibroin/Alginate Dialdehyde Hydrogel with Tunable Gelation Kinetics, Degradability, and Mechanical Properties: A Potential Candidate for Tissue Regeneration. Biomacromolecules 2024; 25:2323-2337. [PMID: 38437165 DOI: 10.1021/acs.biomac.3c01203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Genipin-cross-linked silk fibroin (SF) hydrogel is considered to be biocompatible and mechanically robust. However, its use remains a challenge for in situ forming applications due to its prolonged gelation process. In our attempt to facilitate the in situ fabrication of a genipin-mediated SF hydrogel, alginate dialdehyde (ADA) was utilized as a reinforcement template. Here, SF/ADA-based hydrogels with different compositions were synthesized covalently and ionically. Incorporating ADA into the SF hydrogel increased pore size (44.66-174.66 μm), porosity (61.59-80.40%), and the equilibrium swelling degree (7.60-30.17). Moreover, a wide range of storage modulus and compressive modulus were obtained by adjusting the proportions of SF and ADA networks within the hydrogel. The in vitro cell analysis using preosteoblast cells (MC3T3-E1) demonstrated the cytocompatibility of all hydrogels. Overall, the covalently and ionically cross-linked SF/ADA hydrogel represents a promising solution for in situ forming hydrogels for applications in tissue regeneration.
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Affiliation(s)
- Asma Sadat Vaziri
- Biomedical Engineering Division, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran 14115-111, Iran
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen 91058, Germany
| | - Ebrahim Vasheghani-Farahani
- Biomedical Engineering Division, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran 14115-111, Iran
| | - Simzar Hosseinzadeh
- Medical Nanotechnology and Tissue Engineering Research Center, Shahid Beheshti University of Medical Sciences, Tehran 1968917313, Iran
| | - Fatemeh Bagheri
- Biotechnology Department, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran 14115-111, Iran
| | - Margitta Büchner
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen 91058, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen 91058, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen 91058, Germany
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Xu Z, Arkudas A, Munawar MA, Schubert DW, Fey T, Weisbach V, Mengen LM, Horch RE, Cai A. Schwann Cells Do Not Promote Myogenic Differentiation in the EPI Loop Model. Tissue Eng Part A 2024; 30:244-256. [PMID: 38063005 DOI: 10.1089/ten.tea.2023.0215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Indexed: 01/12/2024] Open
Abstract
In skeletal muscle tissue engineering, innervation and vascularization play an essential role in the establishment of functional skeletal muscle. For adequate three-dimensional assembly, biocompatible aligned nanofibers are beneficial as matrices for cell seeding. The aim of this study was to analyze the impact of Schwann cells (SC) on myoblast (Mb) and adipogenic mesenchymal stromal cell (ADSC) cocultures on poly-ɛ-caprolactone (PCL)-collagen I-nanofibers in vivo. Human Mb/ADSC cocultures, as well as Mb/ADSC/SC cocultures, were seeded onto PCL-collagen I-nanofiber scaffolds and implanted into the innervated arteriovenous loop model (EPI loop model) of immunodeficient rats for 4 weeks. Histological staining and gene expression were used to compare their capacity for vascularization, immunological response, myogenic differentiation, and innervation. After 4 weeks, both Mb/ADSC and Mb/ADSC/SC coculture systems showed similar amounts and distribution of vascularization, as well as immunological activity. Myogenic differentiation could be observed in both groups through histological staining (desmin, myosin heavy chain) and gene expression (MYOD, MYH3, ACTA1) without significant difference between groups. Expression of CHRNB and LAMB2 also implied neuromuscular junction formation. Our study suggests that the addition of SC did not significantly impact myogenesis and innervation in this model. The implanted motor nerve branch may have played a more significant role than the presence of SC.
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Affiliation(s)
- Zhou Xu
- Laboratory for Tissue Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
- Department of Thyroid and Breast Surgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Andreas Arkudas
- Laboratory for Tissue Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Muhammad Azeem Munawar
- Department of Materials Science and Engineering, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Dirk W Schubert
- Department of Materials Science and Engineering, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Tobias Fey
- Department of Materials Science and Engineering, Institute of Glass and Ceramics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Volker Weisbach
- Department of Transfusion Medicine, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Lilly M Mengen
- Laboratory for Tissue Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Raymund E Horch
- Laboratory for Tissue Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Aijia Cai
- Laboratory for Tissue Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
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Gaß H, Kloos TM, Höfling A, Müller L, Rockmann L, Schubert DW, Halik M. Magnetic Removal of Micro- and Nanoplastics from Water-from 100 nm to 100 µm Debris Size. Small 2024; 20:e2305467. [PMID: 37875633 DOI: 10.1002/smll.202305467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/12/2023] [Indexed: 10/26/2023]
Abstract
Clean water is one of the most important resources of the planet but human-made contamination with diverse pollutants increases continuously. Microplastics (<5 mm diameter) which can have severe impacts on the environment, are present worldwide. Degradation processes lead to nanoplastics (<1 µm), which are potentially even more dangerous due to their increased bioavailability. State-of-the-art wastewater treatment plants show a deficit in effectively eliminating micro- and nanoplastics (MNP) from water, particularly in the case of nanoplastics. In this work, the magnetic removal of three different MNP types across three orders of magnitude in size (100 nm-100 µm) is investigated systematically. Superparamagnetic iron oxide nanoparticles (SPIONs) tend to attract oppositely charged MNPs and form aggregates that can be easily collected by a magnet. It shows that especially the smallest fractions (100-300 nm) can be separated in ordinary high numbers (1013 mg-1 SPION) while the highest mass is removed for MNP between 2.5 and 5 µm. The universal trend for all three types of MNP can be fitted with a derived model, which can make predictions for optimizing SPIONs for specific size ranges in the future.
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Affiliation(s)
- Henrik Gaß
- Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Tonya M Kloos
- Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Anna Höfling
- Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Lukas Müller
- Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Linda Rockmann
- Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Marcus Halik
- Organic Materials & Devices, Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany
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6
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Mészáros L, Himmler M, Schneider Y, Arnold P, Dörje F, Schubert DW, Winkler J. Sobetirome rescues α-synuclein-mediated demyelination in an in vitro model of multiple system atrophy. Eur J Neurosci 2024; 59:308-315. [PMID: 38086536 DOI: 10.1111/ejn.16215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 09/17/2023] [Accepted: 11/21/2023] [Indexed: 01/23/2024]
Abstract
Multiple system atrophy (MSA) is a rare and rapidly progressive atypical parkinsonian disorder characterized by oligodendroglial cytoplasmic inclusions containing α-synuclein (α-syn), demyelination, inflammation and neuronal loss. To date, no disease-modifying therapy is available. Targeting α-syn-driven oligodendroglial dysfunction and demyelination presents a potential therapeutic approach for restricting axonal dysfunction, neuronal loss and disease progression. The present study investigated the promyelinogenic potential of sobetirome, a blood-brain barrier permeable and central nervous system selective thyromimetic in the context of an in vitro MSA model. Oligodendrocyte precursor cells (OPCs) were obtained from transgenic mice overexpressing human α-syn specifically in oligodendrocytes (MBP29 mouse line), a well-described MSA model, and non-transgenic littermates. mRNA and protein expression analyses revealed a substantial rescue effect of sobetirome on myelin-specific proteins in control and α-syn overexpressing oligodendrocytes. Furthermore, myelination analysis using nanofibres confirmed that sobetirome increases both the length and number of myelinated segments per oligodendrocyte in primary murine α-syn overexpressing oligodendrocytes and their respective control. These results suggest that sobetirome may be a promising thyromimetic compound targeting an important neuropathological hallmark of MSA.
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Affiliation(s)
- Lisa Mészáros
- Department of Molecular Neurology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Marcus Himmler
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Fürth, Germany
| | - Yanni Schneider
- Department of Molecular Neurology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Philipp Arnold
- Institute of Functional and Clinical Anatomy, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Frank Dörje
- Pharmacy Department, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Fürth, Germany
| | - Jürgen Winkler
- Department of Molecular Neurology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
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7
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Esser TU, Anspach A, Muenzebrock KA, Kah D, Schrüfer S, Schenk J, Heinze KG, Schubert DW, Fabry B, Engel FB. Direct 3D-Bioprinting of hiPSC-Derived Cardiomyocytes to Generate Functional Cardiac Tissues. Adv Mater 2023; 35:e2305911. [PMID: 37655652 DOI: 10.1002/adma.202305911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/18/2023] [Indexed: 09/02/2023]
Abstract
3D-bioprinting is a promising technology to produce human tissues as drug screening tool or for organ repair. However, direct printing of living cells has proven difficult. Here, a method is presented to directly 3D-bioprint human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes embedded in a collagen-hyaluronic acid ink, generating centimeter-sized functional ring- and ventricle-shaped cardiac tissues in an accurate and reproducible manner. The printed tissues contain hiPSC-derived cardiomyocytes with well-organized sarcomeres and exhibit spontaneous and regular contractions, which persist for several months and are able to contract against passive resistance. Importantly, beating frequencies of the printed cardiac tissues can be modulated by pharmacological stimulation. This approach opens up new possibilities for generating complex functional cardiac tissues as models for advanced drug screening or as tissue grafts for organ repair or replacement.
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Affiliation(s)
- Tilman U Esser
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Annalise Anspach
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Katrin A Muenzebrock
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Delf Kah
- Department of Physics, University of Erlangen-Nuremberg, 91052, Erlangen, Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Joachim Schenk
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, Julius-Maximilians-Universität Würzburg (JMU), 97080, Würzburg, Germany
| | - Katrin G Heinze
- Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, Julius-Maximilians-Universität Würzburg (JMU), 97080, Würzburg, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Ben Fabry
- Department of Physics, University of Erlangen-Nuremberg, 91052, Erlangen, Germany
| | - Felix B Engel
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
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8
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Rosellini E, Cascone MG, Guidi L, Schubert DW, Roether JA, Boccaccini AR. Mending a broken heart by biomimetic 3D printed natural biomaterial-based cardiac patches: a review. Front Bioeng Biotechnol 2023; 11:1254739. [PMID: 38047285 PMCID: PMC10690428 DOI: 10.3389/fbioe.2023.1254739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/16/2023] [Indexed: 12/05/2023] Open
Abstract
Myocardial infarction is one of the major causes of mortality as well as morbidity around the world. Currently available treatment options face a number of drawbacks, hence cardiac tissue engineering, which aims to bioengineer functional cardiac tissue, for application in tissue repair, patient specific drug screening and disease modeling, is being explored as a viable alternative. To achieve this, an appropriate combination of cells, biomimetic scaffolds mimicking the structure and function of the native tissue, and signals, is necessary. Among scaffold fabrication techniques, three-dimensional printing, which is an additive manufacturing technique that enables to translate computer-aided designs into 3D objects, has emerged as a promising technique to develop cardiac patches with a highly defined architecture. As a further step toward the replication of complex tissues, such as cardiac tissue, more recently 3D bioprinting has emerged as a cutting-edge technology to print not only biomaterials, but also multiple cell types simultaneously. In terms of bioinks, biomaterials isolated from natural sources are advantageous, as they can provide exceptional biocompatibility and bioactivity, thus promoting desired cell responses. An ideal biomimetic cardiac patch should incorporate additional functional properties, which can be achieved by means of appropriate functionalization strategies. These are essential to replicate the native tissue, such as the release of biochemical signals, immunomodulatory properties, conductivity, enhanced vascularization and shape memory effects. The aim of the review is to present an overview of the current state of the art regarding the development of biomimetic 3D printed natural biomaterial-based cardiac patches, describing the 3D printing fabrication methods, the natural-biomaterial based bioinks, the functionalization strategies, as well as the in vitro and in vivo applications.
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Affiliation(s)
| | | | - Lorenzo Guidi
- Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy
| | - Dirk W. Schubert
- Department of Materials Science and Engineering, Institute of Polymer Materials, Friedrich-Alexander-University (FAU), Erlangen, Germany
- Bavarian Polymer Institute (BPI), Erlangen, Germany
| | - Judith A. Roether
- Department of Materials Science and Engineering, Institute of Polymer Materials, Friedrich-Alexander-University (FAU), Erlangen, Germany
| | - Aldo R. Boccaccini
- Bavarian Polymer Institute (BPI), Erlangen, Germany
- Department of Materials Science and Engineering, Institute of Biomaterials, Friedrich-Alexander-University (FAU), Erlangen, Germany
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Elbayomi M, Tandler R, Ebel N, Schubert DW, Werner S, Kondruweit M, Weyand M, Heim C. Correction: Patient-tailored silicone plug for HeartMate 3™ left ventricular assist device explantation. J Artif Organs 2023:10.1007/s10047-023-01419-7. [PMID: 37952002 DOI: 10.1007/s10047-023-01419-7] [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: 11/14/2023]
Affiliation(s)
- Mohamed Elbayomi
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany.
| | - Rene Tandler
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Nina Ebel
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Dirk W Schubert
- Institute for Polymer Materials, Friedrich-Alexander-University, Erlangen, Germany
| | - Siegfried Werner
- Institute for Polymer Materials, Friedrich-Alexander-University, Erlangen, Germany
| | - Markus Kondruweit
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Micheal Weyand
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Christian Heim
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
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10
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Schaefer N, Andrade Mier MS, Sonnleitner D, Murenu N, Ng XJ, Lamberger Z, Buechner M, Trossmann VT, Schubert DW, Scheibel T, Lang G. Rheological and Biological Impact of Printable PCL-Fibers as Reinforcing Fillers in Cell-Laden Spider-Silk Bio-Inks. Small Methods 2023; 7:e2201717. [PMID: 37349897 DOI: 10.1002/smtd.202201717] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 05/09/2023] [Indexed: 06/24/2023]
Abstract
The development of bio-inks capable of being 3D-printed into cell-containing bio-fabricates with sufficient shape fidelity is highly demanding. Structural integrity and favorable mechanical properties can be achieved by applying high polymer concentrations in hydrogels. Unfortunately, this often comes at the expense of cell performance since cells may become entrapped in the dense matrix. This drawback can be addressed by incorporating fibers as reinforcing fillers that strengthen the overall bio-ink structure and provide a second hierarchical micro-structure to which cells can adhere and align, resulting in enhanced cell activity. In this work, the potential impact of collagen-coated short polycaprolactone-fibers on cells after being printed in a hydrogel is systematically studied. The matrix is composed of eADF4(C16), a recombinant spider silk protein that is cytocompatible but non-adhesive for cells. Consequently, the impact of fibers could be exclusively examined, excluding secondary effects induced by the matrix. Applying this model system, a significant impact of such fillers on rheology and cell behavior is observed. Strikingly, it could be shown that fibers reduce cell viability upon printing but subsequently promote cell performance in the printed construct, emphasizing the need to distinguish between in-print and post-print impact of fillers in bio-inks.
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Affiliation(s)
- Natascha Schaefer
- Institute for Clinical Neurobiology, University Hospital of Würzburg, Versbacherstr. 5, D-97078, Würzburg, Germany
| | - Mateo S Andrade Mier
- Institute for Clinical Neurobiology, University Hospital of Würzburg, Versbacherstr. 5, D-97078, Würzburg, Germany
| | - David Sonnleitner
- Biopolymer Processing Group, University of Bayreuth, Ludwig-Thoma-Str. 36A, D-95447, Bayreuth, Germany
| | - Nicoletta Murenu
- Institute for Clinical Neurobiology, University Hospital of Würzburg, Versbacherstr. 5, D-97078, Würzburg, Germany
| | - Xuen Jen Ng
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, D-95447, Bayreuth, Germany
| | - Zan Lamberger
- Department for Functional Materials in Medicine and Dentistry, University Hospital of Würzburg, Pleicherwall 2, D-97070, Würzburg, Germany
| | - Margitta Buechner
- Department of Materials Science and Engineering, Chair of Polymer Materials, University of Erlangen-Nuremberg, Martensstr. 7, D-91058, Erlangen, Germany
| | - Vanessa T Trossmann
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, D-95447, Bayreuth, Germany
| | - Dirk W Schubert
- Department of Materials Science and Engineering, Chair of Polymer Materials, University of Erlangen-Nuremberg, Martensstr. 7, D-91058, Erlangen, Germany
| | - Thomas Scheibel
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, D-95447, Bayreuth, Germany
| | - Gregor Lang
- Department for Functional Materials in Medicine and Dentistry, University Hospital of Würzburg, Pleicherwall 2, D-97070, Würzburg, Germany
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11
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Halamicek R, Wiesmann C, Kröner R, Eber M, Bogdan C, Schubert DW. Influence of different treatment conditions on the filtration performance of conventional electret melt blown non-woven and novel nano FFP2 masks. PLoS One 2023; 18:e0291679. [PMID: 37733804 PMCID: PMC10513275 DOI: 10.1371/journal.pone.0291679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 09/02/2023] [Indexed: 09/23/2023] Open
Abstract
To allow an efficient protection against viruses like the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2), it is important to avoid their spreading by using filtering face pieces (FFP), which are categorized by different standards according to their filtration efficiency. In this study, we subjected six brands of FFP2 standard masks to three different conditions and subsequently analysed them for their filtration performance to evaluate potentials for reusability. The conditions comprised changes of temperature and air humidity, an exposure to isopropyl alcohol (IPA) and an autoclave sterilization. While four of six masks consisted of electrostatically treated melt blown non-wovens, two masks were fabricated using a nanofibrous multilayer system. Due to the absence of prior electrostatic treatment, the nano-masks did not show a significant change in filtration efficiency when discharged by IPA, unlike the melt blown nonwoven masks showing a significant decrease of filtration efficiency down to around 50% at a particle size of 0.3 μm. However, most melt blown masks maintained a sufficient filtration efficiency after all other treatments with even better results than the nanofibrous masks. This was particularly the case for the capacity to filter smallest particles/droplets with a size of around 0.1 μm, which is below the range of typical filtering standards and important for the retention of virally contaminated nano-aerosols or unattached viruses. After temperature/humidity variation and autoclave sterilization, melt blown masks were able to retain a filtration efficiency up to over 90% at 0.1 μm contrary to nano-masks showing a decrease down to around 70%. Based on their better filtration performance, lower price and potential reusability, we conclude that electret melt blown masks are the preferable type of FFP2 masks.
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Affiliation(s)
- Robin Halamicek
- Department of Material Science, Institute of Polymer Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Bavaria, Germany
| | - Carolin Wiesmann
- Department of Material Science, Institute of Polymer Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Bavaria, Germany
| | - Richard Kröner
- Department of Material Science, Institute of Polymer Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Bavaria, Germany
| | - Matthias Eber
- Fiatec–Filter- und Aerosoltechnologie GmbH, Mainleus, Bavaria, Germany
| | - Christian Bogdan
- Mikrobiologisches Institut–Klinische Mikrobiologie, Immunologie und Hygiene, Universitätsklinikum Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Bavaria, Germany
| | - Dirk W. Schubert
- Department of Material Science, Institute of Polymer Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Bavaria, Germany
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12
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Roshanbinfar K, Kolesnik-Gray M, Angeloni M, Schruefer S, Fiedler M, Schubert DW, Ferrazzi F, Krstic V, Engel FB. Collagen Hydrogel Containing Polyethylenimine-Gold Nanoparticles for Drug Release and Enhanced Beating Properties of Engineered Cardiac Tissues. Adv Healthc Mater 2023; 12:e2202408. [PMID: 36976709 DOI: 10.1002/adhm.202202408] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [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: 12/15/2022] [Revised: 03/10/2023] [Indexed: 03/29/2023]
Abstract
Cardiac tissue engineering is a promising strategy to prevent heart failure. However, several issues remain unsolved, including efficient electrical coupling and incorporating factors to enhance tissue maturation and vascularization. Herein, a biohybrid hydrogel that enhances beating properties of engineered cardiac tissues and allows drug release concurrently is developed. Gold nanoparticles (AuNPs) with different sizes (18-241 nm) and surface charges (33.9-55.4 mV) are synthesized by reducing gold (III) chloride trihydrate using branched polyethyleneimine (bPEI). These nanoparticles increase gel stiffness from ≈91 to ≈146 kPa, enhance electrical conductivity of collagen hydrogels from ≈40 to 49-68 mS cm-1 , and allow slow and steady release of loaded drugs. Engineered cardiac tissues based on bPEI-AuNP-collagen hydrogels and either primary or human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes show enhanced beating properties. hiPSC-derived cardiomyocytes exhibit more aligned and wider sarcomeres in bPEI-AuNP-collagen hydrogels compared to collagen hydrogels. Furthermore, the presence of bPEI-AuNPs result in advanced electrical coupling evidenced by synchronous and homogenous calcium flux throughout the tissue. RNA-seq analyses are in agreement with these observations. Collectively, this data demonstrate the potential of bPEI-AuNP-collagen hydrogels to improve tissue engineering approaches to prevent heart failure and possibly treat diseases of other electrically sensitive tissues.
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Affiliation(s)
- Kaveh Roshanbinfar
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, University of Erlangen-Nuremberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Maria Kolesnik-Gray
- Department of Physics, University of Erlangen-Nuremberg (FAU), Staudtstr. 7, 91058, Erlangen, Germany
| | - Miriam Angeloni
- Institute of Pathology, University of Erlangen-Nuremberg (FAU), 91054, Erlangen, Germany
| | - Stefan Schruefer
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Maren Fiedler
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, University of Erlangen-Nuremberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Fulvia Ferrazzi
- Institute of Pathology, University of Erlangen-Nuremberg (FAU), 91054, Erlangen, Germany
- Department of Nephropathology, Institute of Pathology, University of Erlangen-Nuremberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
| | - Vojislav Krstic
- Department of Physics, University of Erlangen-Nuremberg (FAU), Staudtstr. 7, 91058, Erlangen, Germany
| | - Felix B Engel
- Experimental Renal and Cardiovascular Research, Department of Nephropathology, Institute of Pathology, University of Erlangen-Nuremberg (FAU), Muscle Research Center Erlangen (MURCE), 91054, Erlangen, Germany
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13
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Unalan I, Schruefer S, Schubert DW, Boccaccini AR. 3D-Printed Multifunctional Hydrogels with Phytotherapeutic Properties: Development of Essential Oil-Incorporated ALG-XAN Hydrogels for Wound Healing Applications. ACS Biomater Sci Eng 2023. [PMID: 37352499 DOI: 10.1021/acsbiomaterials.3c00406] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/25/2023]
Abstract
This study aimed to develop three-dimensional (3D)-printed hydrogels containing phytotherapeutic agents as multifunctional wound dressings. In this regard, 3D-printed sodium alginate (ALG)-xanthan gum (XAN) hydrogels incorporated with different clove essential oil (CLV) concentrations were produced by the extrusion-based 3D-printing technology. Rheology measurements, filament fusion, and filament collapse analyses indicated that XAN's blending overcame the challenges associated with ALG's printability and shape fidelity. Attenuated total reflection-Fourier-transform infrared (ATR-FTIR) spectra and total phenolic content assay confirmed the presence of CLV in the 3D-printed hydrogels. Additionally, the releasing profile showed that CLV exhibited long-term release for up to 28 days. Furthermore, the incorporation of CLV increased 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging while reducing the S. aureus and E. coli relative bacterial viability; thereby, the CLV incorporation enhanced the 3D-printed ALG-XAN hydrogel antioxidant and antibacterial activity. In addition, anti-inflammatory activity was assessed using Raw 264.7 macrophage-like cells, and the results demonstrated that CLV reduced nitric oxide (NO) concentration in medium, indicating a potential anti-inflammatory effect. Moreover, in vitro cytotoxicity results showed that the incorporation of CLV has no toxic effect on NHDF cells, whereas the proliferation of NHDF cells exhibited a dose-dependent response. In conclusion, the present study shows not only the development of a new ALG-XAN biomaterial ink but also the potential benefit of natural phytotherapeutics incorporated into 3D-printed hydrogels as a multifunctional wound dressing.
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Affiliation(s)
- Irem Unalan
- Department of Materials Science and Engineering, Institute of Biomaterials, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Stefan Schruefer
- Department of Material Science and Engineering, Institute of Polymeric Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Dirk W Schubert
- Department of Material Science and Engineering, Institute of Polymeric Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Aldo R Boccaccini
- Department of Materials Science and Engineering, Institute of Biomaterials, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
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14
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Schulik J, Salehi S, Boccaccini AR, Schrüfer S, Schubert DW, Arkudas A, Kengelbach-Weigand A, Horch RE, Schmid R. Comparison of the Behavior of 3D-Printed Endothelial Cells in Different Bioinks. Bioengineering (Basel) 2023; 10:751. [PMID: 37508778 PMCID: PMC10376299 DOI: 10.3390/bioengineering10070751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/19/2023] [Accepted: 06/21/2023] [Indexed: 07/30/2023] Open
Abstract
Biomaterials with characteristics similar to extracellular matrix and with suitable bioprinting properties are essential for vascular tissue engineering. In search for suitable biomaterials, this study investigated the three hydrogels alginate/hyaluronic acid/gelatin (Alg/HA/Gel), pre-crosslinked alginate di-aldehyde with gelatin (ADA-GEL), and gelatin methacryloyl (GelMA) with respect to their mechanical properties and to the survival, migration, and proliferation of human umbilical vein endothelial cells (HUVECs). In addition, the behavior of HUVECs was compared with their behavior in Matrigel. For this purpose, HUVECs were mixed with the inks both as single cells and as cell spheroids and printed using extrusion-based bioprinting. Good printability with shape fidelity was determined for all inks. The rheological measurements demonstrated the gelling consistency of the inks and shear-thinning behavior. Different Young's moduli of the hydrogels were determined. However, all measured values where within the range defined in the literature, leading to migration and sprouting, as well as reconciling migration with adhesion. Cell survival and proliferation in ADA-GEL and GelMA hydrogels were demonstrated for 14 days. In the Alg/HA/Gel bioink, cell death occurred within 7 days for single cells. Sprouting and migration of the HUVEC spheroids were observed in ADA-GEL and GelMA. Similar behavior of the spheroids was seen in Matrigel. In contrast, the spheroids in the Alg/HA/Gel ink died over the time studied. It has been shown that Alg/HA/Gel does not provide a good environment for long-term survival of HUVECs. In conclusion, ADA-GEL and GelMA are promising inks for vascular tissue engineering.
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Affiliation(s)
- Jana Schulik
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery University Hospital of Erlangen, Krankenhausstraße 12, 91054 Erlangen, Germany
| | - Sahar Salehi
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, 95447 Bayreuth, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstrasse 6, 91058 Erlangen, Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
| | - Andreas Arkudas
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery University Hospital of Erlangen, Krankenhausstraße 12, 91054 Erlangen, Germany
| | - Annika Kengelbach-Weigand
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery University Hospital of Erlangen, Krankenhausstraße 12, 91054 Erlangen, Germany
| | - Raymund E Horch
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery University Hospital of Erlangen, Krankenhausstraße 12, 91054 Erlangen, Germany
| | - Rafael Schmid
- Laboratory for Tissue-Engineering and Regenerative Medicine, Department of Plastic and Hand Surgery University Hospital of Erlangen, Krankenhausstraße 12, 91054 Erlangen, Germany
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15
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Cai A, Schneider P, Zheng ZM, Beier JP, Himmler M, Schubert DW, Weisbach V, Horch RE, Arkudas A. Myogenic differentiation of human myoblasts and Mesenchymal stromal cells under GDF11 on NPoly-ɛ-caprolactone-collagen I-Polyethylene-nanofibers. BMC Mol Cell Biol 2023; 24:18. [PMID: 37189080 PMCID: PMC10184409 DOI: 10.1186/s12860-023-00478-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 02/19/2023] [Accepted: 04/27/2023] [Indexed: 05/17/2023] Open
Abstract
BACKGROUND For the purpose of skeletal muscle engineering, primary myoblasts (Mb) and adipogenic mesenchymal stem cells (ADSC) can be co-cultured and myogenically differentiated. Electrospun composite nanofiber scaffolds represent suitable matrices for tissue engineering of skeletal muscle, combining both biocompatibility and stability Although growth differentiation factor 11 (GDF11) has been proposed as a rejuvenating circulating factor, restoring skeletal muscle function in aging mice, some studies have also described a harming effect of GDF11. Therefore, the aim of the study was to analyze the effect of GDF11 on co-cultures of Mb and ADSC on poly-ε-caprolactone (PCL)-collagen I-polyethylene oxide (PEO)-nanofibers. RESULTS Human Mb were co-cultured with ADSC two-dimensionally (2D) as monolayers or three-dimensionally (3D) on aligned PCL-collagen I-PEO-nanofibers. Differentiation media were either serum-free with or without GDF11, or serum containing as in a conventional differentiation medium. Cell viability was higher after conventional myogenic differentiation compared to serum-free and serum-free + GDF11 differentiation as was creatine kinase activity. Immunofluorescence staining showed myosine heavy chain expression in all groups after 28 days of differentiation without any clear evidence of more or less pronounced expression in either group. Gene expression of myosine heavy chain (MYH2) increased after serum-free + GDF11 stimulation compared to serum-free stimulation alone. CONCLUSIONS This is the first study analyzing the effect of GDF11 on myogenic differentiation of Mb and ADSC co-cultures under serum-free conditions. The results of this study show that PCL-collagen I-PEO-nanofibers represent a suitable matrix for 3D myogenic differentiation of Mb and ADSC. In this context, GDF11 seems to promote myogenic differentiation of Mb and ADSC co-cultures compared to serum-free differentiation without any evidence of a harming effect.
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Affiliation(s)
- Aijia Cai
- Department of Plastic and Hand Surgery, Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany.
| | - Paul Schneider
- Department of Plastic and Hand Surgery, Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Zeng-Ming Zheng
- Department of Plastic and Hand Surgery, Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Justus P Beier
- Department of Plastic Surgery, Hand Surgery - Burn Center, University Hospital RWTH Aachen, 52074, Aachen, Germany
| | - Marcus Himmler
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nürnberg (FAU), 91058, Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nürnberg (FAU), 91058, Erlangen, Germany
| | - Volker Weisbach
- Department of Transfusion Medicine, University Hospital of Erlangen, Friedrich-Alexander- University Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Raymund E Horch
- Department of Plastic and Hand Surgery, Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Andreas Arkudas
- Department of Plastic and Hand Surgery, Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen, Friedrich-Alexander University of Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
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16
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Elbayomi M, Tandler R, Ebel N, Schubert DW, Werner S, Kondruweit M, Weyand M, Heim C. Patient-tailored silicone plug for HeartMate 3™ left ventricular assist device explantation. J Artif Organs 2023:10.1007/s10047-023-01397-w. [PMID: 37099051 DOI: 10.1007/s10047-023-01397-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 01/26/2023] [Accepted: 04/13/2023] [Indexed: 04/27/2023]
Abstract
Patient-tailored silicone plug for HeartMate 3™ left ventricular assist device explantation in two successive males proceeded successfully. Given medical therapeutic advancements, FDA-approved plug systems designed by LVAD manufacturers themselves will be necessary for the near future to provide a safe and simple device explantation alternative that fulfills all regulatory standards.
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Affiliation(s)
- Mohamed Elbayomi
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany.
| | - Rene Tandler
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Nina Ebel
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Dirk W Schubert
- Institute for Polymer Materials, Friedrich-Alexander-University, Erlangen, Germany
| | - Siegfried Werner
- Institute for Polymer Materials, Friedrich-Alexander-University, Erlangen, Germany
| | - Markus Kondruweit
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Micheal Weyand
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - Christian Heim
- Department of Cardiac Surgery, Friedrich-Alexander-University, Krankenhausstr. 12, 91054, Erlangen, Germany
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17
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Li W, Garmendia N, Pérez de Larraya U, Ding Y, Detsch R, Grünewald A, Roether JA, Schubert DW, Boccaccini AR. Correction: 45S5 bioactive glass-based scaffolds coated with cellulose nanowhiskers for bone tissue engineering. RSC Adv 2023; 13:13015. [PMID: 37126469 PMCID: PMC10131635 DOI: 10.1039/d3ra90041j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 04/19/2023] [Indexed: 05/02/2023] Open
Abstract
[This corrects the article DOI: 10.1039/C4RA07740G.].
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Affiliation(s)
- Wei Li
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Cauerstrasse 6 91058 Erlangen Germany +49 9131 85 28602 +49 9131 85 28601
| | - Nere Garmendia
- Cemitec, Polígono Mocholí Plaza Cein 4 31110 Noain Navarra Spain
| | | | - Yaping Ding
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Rainer Detsch
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Cauerstrasse 6 91058 Erlangen Germany +49 9131 85 28602 +49 9131 85 28601
| | - Alina Grünewald
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Cauerstrasse 6 91058 Erlangen Germany +49 9131 85 28602 +49 9131 85 28601
| | - Judith A Roether
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Martensstrasse 7 91058 Erlangen Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg Cauerstrasse 6 91058 Erlangen Germany +49 9131 85 28602 +49 9131 85 28601
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18
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Xu H, Qu M, Chen B, Yang Q, Schubert DW. The relationship between exponent t in McLachlan equation and electronic percolation thresholds of solution cast films. J Polym Res 2022. [DOI: 10.1007/s10965-022-03330-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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19
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Polykandriotis E, Himmler M, Mansouri S, Ruppe F, Grüner J, Bräeuer L, Schubert DW, Horch RE. Polytetrafluoroethylene (PTFE) as a Suture Material in Tendon Surgery. J Vis Exp 2022. [DOI: 10.3791/64115] [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] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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20
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Munawar MA, Schubert DW. Thermal-Induced Percolation Phenomena and Elasticity of Highly Oriented Electrospun Conductive Nanofibrous Biocomposites for Tissue Engineering. Int J Mol Sci 2022; 23:ijms23158451. [PMID: 35955588 PMCID: PMC9369359 DOI: 10.3390/ijms23158451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 07/18/2022] [Accepted: 07/19/2022] [Indexed: 12/04/2022] Open
Abstract
Highly oriented electrospun conductive nanofibrous biocomposites (CNBs) of polylactic acid (PLA) and polyaniline (PANi) are fabricated using electrospinning. At the percolation threshold (φc), the growth of continuous paths between PANi particles leads to a steep increase in the electrical conductivity of fibers, and the McLachlan equation is fitted to identify φc. Annealing generates additional conductive channels, which lead to higher conductivity for dynamic percolation. For the first time, dynamic percolation is investigated for revealing time-temperature superposition in oriented conductive nanofibrous biocomposites. The crystallinity (χc) displays a linear dependence on annealing temperature within the confined fiber of CNBs. The increase in crystallinity due to annealing also increases the Young’s modulus E of CNBs. The present study outlines a reliable approach to determining the conductivity and elasticity of nanofibers that are highly desirable for a wide range of biological tissue applications.
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Affiliation(s)
- Muhammad A. Munawar
- Institute of Polymer Materials, Department of Material Science, Faculty of Engineering, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Dr.-Mack-Strasse 77, 90762 Fürth, Germany
- Correspondence: (M.A.M.); (D.W.S.)
| | - Dirk W. Schubert
- Institute of Polymer Materials, Department of Material Science, Faculty of Engineering, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Dr.-Mack-Strasse 77, 90762 Fürth, Germany
- Correspondence: (M.A.M.); (D.W.S.)
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21
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Luo XL, Schubert DW. Experimental and Theoretical Study on Piezoresistive Behavior of Compressible Melamine Sponge Modified by Carbon-based Fillers. Chin J Polym Sci 2022. [DOI: 10.1007/s10118-022-2771-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Polykandriotis E, Daenicke J, Bolat A, Grüner J, Schubert DW, Horch RE. Individualized Wound Closure-Mechanical Properties of Suture Materials. J Pers Med 2022; 12:jpm12071041. [PMID: 35887538 PMCID: PMC9316899 DOI: 10.3390/jpm12071041] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 04/30/2022] [Revised: 06/19/2022] [Accepted: 06/22/2022] [Indexed: 11/16/2022] Open
Abstract
Wound closure is a key element of any procedure, especially aesthetic and reconstructive plastic surgery. Therefore, over the last decades, several devices have been developed in order to assist surgeons in achieving better results while saving valuable time. In this work, we give a concise review of the literature and present a biomechanical study of different suturing materials under mechanical load mimicking handling in the operating theatre. Nine different suture products, all of the same USP size (4-0), were subjected to a standardized crushing load by means of a needle holder. All materials were subjected to 0, 1, 3 and 5 crushing load cycles, respectively. The linear tensile strength was measured by means of a universal testing device. Attenuation of tensile strength was evaluated between materials and between crush cycles. In the pooled analysis, the linear tensile strength of the suture materials deteriorated significantly with every cycle (p < 0.0001). The suture materials displayed different initial tensile strengths (in descending order: polyglecaprone, polyglactin, polydioxanone, polyamid, polypropylene). In comparison, materials performed variably in terms of resistance to crush loading. The findings were statistically significant. The reconstructive surgeon has to be flexible and tailor wound closure techniques and materials to the individual patient, procedure and tissue demands; therefore, profound knowledge of the physical properties of the suture strands used is of paramount importance. The crushing load on suture materials during surgery can be detrimental for initial and long-term wound repair strength. As well as the standard wound closure methods (sutures, staples and adhesive strips), there are promising novel devices.
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Affiliation(s)
- Elias Polykandriotis
- Department of Plastic, Hand and Microsurgery, Sana Hospital Hof, 95032 Hof, Germany
- Department of Plastic and Hand Surgery, University of Erlangen Medical Center, 91054 Erlangen, Germany; (J.G.); (R.E.H.)
- Correspondence: ; Tel.: +49-15161-068069
| | - Jonas Daenicke
- Department of Materials Science and Engineering, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; (J.D.); (D.W.S.)
| | - Anil Bolat
- Department of Orthopedics, Theresien Hospital, 90491 Nürnberg, Germany;
| | - Jasmin Grüner
- Department of Plastic and Hand Surgery, University of Erlangen Medical Center, 91054 Erlangen, Germany; (J.G.); (R.E.H.)
| | - Dirk W. Schubert
- Department of Materials Science and Engineering, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, Germany; (J.D.); (D.W.S.)
| | - Raymund E. Horch
- Department of Plastic and Hand Surgery, University of Erlangen Medical Center, 91054 Erlangen, Germany; (J.G.); (R.E.H.)
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23
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Cheng H, Pan Y, Wang X, Liu C, Shen C, Schubert DW, Guo Z, Liu X. Correction to: Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth. Nanomicro Lett 2022; 14:116. [PMID: 35482164 PMCID: PMC9051000 DOI: 10.1007/s40820-022-00820-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Affiliation(s)
- Haoran Cheng
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Yamin Pan
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Xin Wang
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Chuntai Liu
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Changyu Shen
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Zhanhu Guo
- Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Xianhu Liu
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China.
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24
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Wang X, Zhang M, Schubert DW, Liu X. Oil-Water Separation Polypropylene Foam with Advanced Solvent-Evaporation Induced Coexistence of Microspheres and Microporous Structure. Macromol Rapid Commun 2022; 43:e2200177. [PMID: 35355354 DOI: 10.1002/marc.202200177] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 02/24/2022] [Revised: 03/23/2022] [Indexed: 11/09/2022]
Abstract
For decades, crude oil spills and oil wastewater have become the most problematic environmental pollution and damage to public health. Therefore, it is considerable to develop superhydrophobic polymer foam for separating oil from water with high selectivity and sorption capacity. Here, a new type of environmentally friendly pure polypropylene (PP) foam with superhydrophobicity is first time proposed with a particular coexistence of microspheres and microporous structure fabricated via an advanced solvent-evaporation method. The PP foam exhibits exceptional superhydrophobic with a water contact angle of 151° and the maximum saturated adsorption capacity of 26 g/g. After more than 15 h of cyclic continuous oil-water pumping experiment, it still maintains a high oil absorption efficiency of 98%, providing the basis for practical commercial applications. More importantly, the variation of hydrophobic properties is described by Flory-Huggins polymer solution theory and Huggins interaction parameters, and the optimal solution ratio range is predicted which providing a relevant theoretical basis for actual industrial production. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Xin Wang
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University, Wenhua Road 97-1, Zhengzhou, 450002, P. R. China.,Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, Erlangen, 91058, Germany
| | - Mingtao Zhang
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University, Wenhua Road 97-1, Zhengzhou, 450002, P. R. China
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, Erlangen, 91058, Germany.,Bavarian Polymer Institute, Dr. Mack-Strasse 77, Fürth, 90762, Germany
| | - Xianhu Liu
- National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University, Wenhua Road 97-1, Zhengzhou, 450002, P. R. China
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25
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Düsenberg B, Kopp SP, Tischer F, Schrüfer S, Roth S, Schmidt J, Schmidt M, Schubert DW, Peukert W, Bück A. Enhancing Photoelectric Powder Deposition of Polymers by Charge Control Substances. Polymers (Basel) 2022; 14:polym14071332. [PMID: 35406208 PMCID: PMC9002572 DOI: 10.3390/polym14071332] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 03/11/2022] [Revised: 03/22/2022] [Accepted: 03/23/2022] [Indexed: 02/04/2023] Open
Abstract
Charge control substances (CCS) as additives for polymer powders are investigated to make polymer powders suitable for the electrophotographic powder deposition in powder-based additive manufacturing. The use of CCS unifies the occurring charge of a powder, which is crucial for this novel deposition method. Therefore, commercially available polymer powder is functionalized via dry coating in a shaker mixer with two different CCS and analyzed afterwards. The flowability and the degree of coverage of additives on the surface are used to evaluate the coating process. The thermal properties are analyzed by use of differential scanning calorimetry. Most important, the influence of the CCS on the powder charge is shown by measurements of the electrostatic surface potential at first and the powder deposition itself is performed and analyzed with selected formulations afterwards to show the potential of this method. Finally, tensile strength specimens are produced with the conventional deposition method in order to show the usability of the CCS for current machines.
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Affiliation(s)
- Björn Düsenberg
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany; (B.D.); (F.T.); (J.S.); (W.P.)
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
| | - Sebastian-Paul Kopp
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
- Bayerisches Laserzentrum Gemeinnützige Forschungsgesellschaft mbH, Konrad-Zuse-Straße 2-6, D-91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), D-91052 Erlangen, Germany
| | - Florentin Tischer
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany; (B.D.); (F.T.); (J.S.); (W.P.)
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
| | - Stefan Schrüfer
- Institute of Polymer Materials (LSP), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, D-91058 Erlangen, Germany; (S.S.); (D.W.S.)
| | - Stephan Roth
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
- Bayerisches Laserzentrum Gemeinnützige Forschungsgesellschaft mbH, Konrad-Zuse-Straße 2-6, D-91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), D-91052 Erlangen, Germany
| | - Jochen Schmidt
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany; (B.D.); (F.T.); (J.S.); (W.P.)
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
| | - Michael Schmidt
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
- Bayerisches Laserzentrum Gemeinnützige Forschungsgesellschaft mbH, Konrad-Zuse-Straße 2-6, D-91052 Erlangen, Germany
- Institute of Photonic Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Straße 3/5, D-91052 Erlangen, Germany
| | - Dirk W. Schubert
- Institute of Polymer Materials (LSP), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, D-91058 Erlangen, Germany; (S.S.); (D.W.S.)
| | - Wolfgang Peukert
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany; (B.D.); (F.T.); (J.S.); (W.P.)
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
| | - Andreas Bück
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany; (B.D.); (F.T.); (J.S.); (W.P.)
- Collaborative Research Center 814—Additive Manufacturing, Am Weichselgarten 9, D-91058 Erlangen, Germany; (S.-P.K.); (S.R.); (M.S.)
- Correspondence:
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26
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Himmler M, Schubert DW, Dähne L, Egri G, Fuchsluger TA. Electrospun PCL Scaffolds as Drug Carrier for Corneal Wound Dressing Using Layer-by-Layer Coating of Hyaluronic Acid and Heparin. Int J Mol Sci 2022; 23:ijms23052765. [PMID: 35269908 PMCID: PMC8910869 DOI: 10.3390/ijms23052765] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/25/2022] [Accepted: 02/28/2022] [Indexed: 01/10/2023] Open
Abstract
Due to its ability to reduce scarring and inflammation, human amniotic membrane is a widely used graft for wound dressings after corneal surgery. To overcome donor dependency and biological variances in the donor tissue, artificial nanofibrous grafts acting as drug carrier systems are promising substitutes. Electrospun nanofibrous scaffolds seem to be an appropriate approach as they offer the properties of permeable scaffolds with a high specific surface, the latter one depending on the fiber diameter. Electrospun scaffolds with fiber diameter of 35 nm, 113 nm, 167 nm and 549 nm were manufactured and coated by the layer-by-layer (LbL) technology with either hyaluronic acid or heparin for enhanced regeneration of corneal tissue after surgery. Studies on drug loading capacity and release kinetics defined a lower limit for nanofibrous scaffolds for effective drug loading. Additionally, scaffold characteristics and resulting mechanical properties from the application-oriented characterization of suture pullout from suture retention tests were examined. Finally, scaffolds consisting of nanofibers with a mean fiber diameter of 113 nm were identified as the best-performing scaffolds, concerning drug loading efficiency and resistance against suture pullout.
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Affiliation(s)
- Marcus Himmler
- Department of Ophthalmology, University Medical Center Rostock, Doberaner Straße 140, 18057 Rostock, Germany
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nuremberg, Martenstraße 7, 91058 Erlangen, Germany;
- Correspondence: (M.H.); (T.A.F.)
| | - Dirk W. Schubert
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nuremberg, Martenstraße 7, 91058 Erlangen, Germany;
| | - Lars Dähne
- Surflay Nanotec GmbH, Max-Planck-Str. 3, 12489 Berlin, Germany; (L.D.); (G.E.)
| | - Gabriella Egri
- Surflay Nanotec GmbH, Max-Planck-Str. 3, 12489 Berlin, Germany; (L.D.); (G.E.)
| | - Thomas A. Fuchsluger
- Department of Ophthalmology, University Medical Center Rostock, Doberaner Straße 140, 18057 Rostock, Germany
- Correspondence: (M.H.); (T.A.F.)
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27
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Cheng H, Pan Y, Wang X, Liu C, Shen C, Schubert DW, Guo Z, Liu X. Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth. Nanomicro Lett 2022; 14:63. [PMID: 35190917 PMCID: PMC8861240 DOI: 10.1007/s40820-022-00812-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 01/22/2022] [Indexed: 05/14/2023]
Abstract
The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research hotspot. Here, the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam (MF) through electrostatic self-assembly and dip-coating adsorption process, realizing the integration of microwave absorption, infrared stealth, and flame retardant. Remarkably, the Ni/MXene-MF achieves a minimum reflection loss (RLmin) of - 62.7 dB with a corresponding effective absorption bandwidth (EAB) of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 mm. Strong electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks, which provided excellent impedance matching, dielectric loss, magnetic loss, interface polarization, and multiple attenuations. In addition, the Ni/MXene-MF endows low density, excellent heat insulation, infrared stealth, and flame-retardant functions. This work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.
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Affiliation(s)
- Haoran Cheng
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Yamin Pan
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Xin Wang
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Chuntai Liu
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Changyu Shen
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Zhanhu Guo
- Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Xianhu Liu
- Key Laboratory of Advanced Material Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, People's Republic of China.
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28
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Hazur J, Endrizzi N, Schubert DW, Boccaccini AR, Fabry B. Stress relaxation amplitude of hydrogels determines migration, proliferation, and morphology of cells in 3-D culture. Biomater Sci 2021; 10:270-280. [PMID: 34850787 DOI: 10.1039/d1bm01089a] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The viscoelastic behavior of hydrogel matrices sensitively influences the cell behavior in 3-D culture and biofabricated tissue model systems. Previous reports have demonstrated that cells tend to adhere, spread, migrate and proliferate better in hydrogels with pronounced stress relaxation. However, it is currently unknown if cells respond more sensitively to the amplitude of stress relaxation, or to the relaxation time constant. To test this, we compare the behavior of fibroblasts cultured for up to 10 days in alginate and oxidized alginate hydrogels with similar Young's moduli but diverging stress relaxation behavior. We find that fibroblasts elongate, migrate and proliferate better in hydrogels that display a higher stress relaxation amplitude. By contrast, the cells' response to the relaxation time constant was less pronounced and less consistent. Together, these data suggest that it is foremost the stress relaxation amplitude of the matrix that determines the ability of cells to locally penetrate and structurally remodel the matrix on a molecular level, which subsequently leads to better spreading, faster migration, and higher cell proliferation. We conclude that the stress relaxation amplitude is a central design parameter for optimizing cell behavior in 3-D hydrogels.
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Affiliation(s)
- Jonas Hazur
- Institute of Biomaterials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Nadine Endrizzi
- Department of Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.
| | - Dirk W Schubert
- Institute for Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Ben Fabry
- Department of Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.
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29
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Qu M, Qin Y, Zhu K, Schubert DW, Lu D, Wu S, Xie Z, Han L, Gao Q, Bier A, Du C. Study on the spinnability and mechanical properties of aspirator aided melt‐spun binary blends polypropylene fibers. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Muchao Qu
- School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China
| | - Yijing Qin
- Center for Engineering Materials and Reliability Guangzhou HKUST Fok Ying Tung Research Institute Guangzhou China
- Institute of Polymer Materialsna Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Kai Zhu
- Institute of Polymer Materialsna Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Dirk W. Schubert
- Institute of Polymer Materialsna Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Dong Lu
- Center for Engineering Materials and Reliability Guangzhou HKUST Fok Ying Tung Research Institute Guangzhou China
| | - Siman Wu
- School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China
| | - Zixin Xie
- School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China
| | - Lei Han
- School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China
| | - Qun Gao
- School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China
| | - Alexander Bier
- Institute of Polymer Materialsna Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Canyi Du
- School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China
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30
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Himmler M, Schubert DW, Fuchsluger TA. Examining the Transmission of Visible Light through Electrospun Nanofibrous PCL Scaffolds for Corneal Tissue Engineering. Nanomaterials (Basel) 2021; 11:nano11123191. [PMID: 34947541 PMCID: PMC8705195 DOI: 10.3390/nano11123191] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/21/2021] [Accepted: 11/23/2021] [Indexed: 12/28/2022]
Abstract
The transparency of nanofibrous scaffolds is of highest interest for potential applications like corneal wound dressings in corneal tissue engineering. In this study, we provide a detailed analysis of light transmission through electrospun polycaprolactone (PCL) scaffolds. PCL scaffolds were produced via electrospinning, with fiber diameters in the range from (35 ± 13) nm to (167 ± 35) nm. Light transmission measurements were conducted using UV-vis spectroscopy in the range of visible light and analyzed with respect to the influence of scaffold thickness, fiber diameter, and surrounding medium. Contour plots were compiled for a straightforward access to light transmission values for arbitrary scaffold thicknesses. Depending on the fiber diameter, transmission values between 15% and 75% were observed for scaffold thicknesses of 10 µm. With a decreasing fiber diameter, light transmission could be improved, as well as with matching refractive indices of fiber material and medium. For corneal tissue engineering, scaffolds should be designed as thin as possible and fabricated from polymers with a matching refractive index to that of the human cornea. Concerning fiber diameter, smaller fiber diameters should be favored for maximizing graft transparency. Finally, a novel, semi-empirical formulation of light transmission through nanofibrous scaffolds is presented.
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Affiliation(s)
- Marcus Himmler
- Department of Ophthalmology, University Medical Center Rostock, Doberaner Straße 140, 18057 Rostock, Germany
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nuremberg, Martenstraße 7, 91058 Erlangen, Germany;
- Correspondence: (M.H.); (T.A.F.)
| | - Dirk W. Schubert
- Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nuremberg, Martenstraße 7, 91058 Erlangen, Germany;
| | - Thomas A. Fuchsluger
- Department of Ophthalmology, University Medical Center Rostock, Doberaner Straße 140, 18057 Rostock, Germany
- Correspondence: (M.H.); (T.A.F.)
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31
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Hesselbarth R, Esser TU, Roshanbinfar K, Struefer S, Schubert DW, Engel FB. Enhancement of engineered cardiac tissues by promotion of hiPSC-cardiomyocyte proliferation. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/14/2022] Open
Abstract
Abstract
Background/Introduction
Cardiac tissue engineering is a promising strategy to generate human cardiac tissues for modelling cardiac diseases, screening for therapeutic drugs, and repairing the injured heart. Yet, several issues remain to be resolved including the generation of tissues with high cardiomyocyte density.
Purpose
Determining the effects of the induction of human-induced pluripotent stem cell-derived (hiPSC) cardiomyocyte proliferation post-fabrication.
Methods
hiPSCs were differentiated into cardiomyocytes, embedded with or without CHIR990121 at three concentrations in a collagen pre-gel, and cast. The engineered cardiac tissues were then cultured in the absence or presence of CHIR99021 for up to 35 days. Hydrogels and engineered cardiac tissues were analysed utilizing rheology and assays to determine viability, proliferation, calcium flow, and contractility.
Results
Here, we show that the integration of CHIR99021 in collagen I hydrogels promotes proliferation of hiPSC-cardiomyocytes post-fabrication improving contractility of and calcium flow in engineered cardiac tissues. Presence of CHIR99021 has no effect on the gelation kinetic or the mechanical properties of collagen I hydrogels. Analysis of cell density and proliferation based on Ki-67 staining indicates that integration of CHIR99021 together with external CHIR99021 stimulation increases hiPSC-cardiomyocyte number by ∼2-fold within 7 days post-fabrication. Analysis of the contractility of engineered cardiac tissues after another 3 days in the absence of external CHIR99021 shows that CHIR99021-induced hiPSC-cardiomyocyte proliferation results in synchronized calcium flow, rhythmic beating, increases speed of contraction and contraction amplitude, and reduces peak-to-peak time. The CHIR99021-stimulated engineered cardiac tissues exhibited spontaneous rhythmic contractions for at least 35 days.
Conclusion
Collectively, our data demonstrate the potential of induced cardiomyocyte proliferation to enhance engineered cardiac tissues by increasing cardiomyocyte density and reducing arrhythmia.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Deutsche Forschungsgemeinschaft
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Affiliation(s)
| | - T U Esser
- University hospital Erlangen, Erlangen, Germany
| | | | - S Struefer
- Friedrich Alexander University, Erlangen, Germany
| | - D W Schubert
- Friedrich Alexander University, Erlangen, Germany
| | - F B Engel
- University hospital Erlangen, Erlangen, Germany
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32
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Hesselbarth R, Esser TU, Roshanbinfar K, Schrüfer S, Schubert DW, Engel FB. CHIR99021 Promotes hiPSC-Derived Cardiomyocyte Proliferation in Engineered 3D Microtissues. Adv Healthc Mater 2021; 10:e2100926. [PMID: 34499814 DOI: 10.1002/adhm.202100926] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 05/11/2021] [Revised: 08/30/2021] [Indexed: 02/05/2023]
Abstract
Cardiac tissue engineering is a promising strategy to generate human cardiac tissues for modeling cardiac diseases, screening for therapeutic drugs, and repairing the injured heart. Yet, several issues remain to be resolved including the generation of tissues with high cardiomyocyte density. Here, it is shown that the integration of the glycogen synthase kinase-3β inhibitor CHIR99021 in collagen I hydrogels promotes proliferation of human-induced pluripotent stem cell-derived (hiPSC) cardiomyocytes post-fabrication improving contractility of and calcium flow in engineered 3D cardiac microtissues. CHIR99021 has no effect on the gelation kinetics or the mechanical properties of collagen I hydrogels. Analysis of cell density and proliferation based on Ki-67 staining indicates that integration of CHIR99021 together with external CHIR99021 stimulation increases hiPSC-cardiomyocyte number by ≈2-fold within 7 d post-fabrication. Analysis of the contractility of engineered cardiac tissues after another 3 d in the absence of external CHIR99021 shows that CHIR99021-induced hiPSC-cardiomyocyte proliferation results in synchronized calcium flow, rhythmic beating, increased speed of contraction and contraction amplitude, and reduced peak-to-peak time. The CHIR99021-stimulated engineered cardiac microtissues exhibit spontaneous rhythmic contractions for at least 35 d. Collectively, the data demonstrate the potential of induced cardiomyocyte proliferation to enhance engineered cardiac microtissues by increasing cardiomyocyte density.
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Affiliation(s)
- Ramona Hesselbarth
- Experimental Renal and Cardiovascular Research Department of Nephropathology Institute of Pathology Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Muscle Research Center Erlangen (MURCE) Erlangen 91054 Germany
| | - Tilman U. Esser
- Experimental Renal and Cardiovascular Research Department of Nephropathology Institute of Pathology Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Muscle Research Center Erlangen (MURCE) Erlangen 91054 Germany
| | - Kaveh Roshanbinfar
- Experimental Renal and Cardiovascular Research Department of Nephropathology Institute of Pathology Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Muscle Research Center Erlangen (MURCE) Erlangen 91054 Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Martensstraße 7 Erlangen 91058 Germany
| | - Dirk W. Schubert
- Institute of Polymer Materials Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Martensstraße 7 Erlangen 91058 Germany
| | - Felix B. Engel
- Experimental Renal and Cardiovascular Research Department of Nephropathology Institute of Pathology Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Muscle Research Center Erlangen (MURCE) Erlangen 91054 Germany
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33
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Munawar MA, Schubert DW. Revealing Electrical and Mechanical Performances of Highly Oriented Electrospun Conductive Nanofibers of Biopolymers with Tunable Diameter. Int J Mol Sci 2021; 22:ijms221910295. [PMID: 34638631 PMCID: PMC8509057 DOI: 10.3390/ijms221910295] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/15/2021] [Accepted: 09/18/2021] [Indexed: 11/24/2022] Open
Abstract
The present study outlines a reliable approach to determining the electrical conductivity and elasticity of highly oriented electrospun conductive nanofibers of biopolymers. The highly oriented conductive fibers are fabricated by blending a high molar mass polyethylene oxide (PEO), polycaprolactone (PCL), and polylactic acid (PLA) with polyaniline (PANi) filler. The filler-matrix interaction and molar mass (M) of host polymer are among governing factors for variable fiber diameter. The conductivity as a function of filler fraction (φ) is shown and described using a McLachlan equation to reveal the electrical percolation thresholds (φc) of the nanofibers. The molar mass of biopolymer, storage time, and annealing temperature are significant factors for φc. The Young’s modulus (E) of conductive fibers is dependent on filler fraction, molar mass, and post-annealing process. The combination of high orientation, tunable diameter, tunable conductivity, tunable elasticity, and biodegradability makes the presented nanofibers superior to the fibers described in previous literature and highly desirable for various biomedical and technical applications.
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Affiliation(s)
- Muhammad A. Munawar
- Institute of Polymer Materials, Department of Material Science, Faculty of Engineering, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Dr.-Mack-Strasse 77, 90762 Fürth, Germany
- Correspondence: (M.A.M.); (D.W.S.)
| | - Dirk W. Schubert
- Institute of Polymer Materials, Department of Material Science, Faculty of Engineering, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Dr.-Mack-Strasse 77, 90762 Fürth, Germany
- Correspondence: (M.A.M.); (D.W.S.)
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34
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Affiliation(s)
- Dirk W. Schubert
- Faculty of Engineering, Department of Materials Science, Institute of Polymer Materials Friedrich‐Alexander University Erlangen‐Nürnberg (FAU) Martensstraße 7 Erlangen 91058 Germany
- Bavarian Polymer Institute Key Lab Advanced Fiber Technology Dr.‐Mack‐Straße 77 Fürth 90762 Germany
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35
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Reakasame S, Dranseikiene D, Schrüfer S, Zheng K, Schubert DW, Boccaccini AR. Development of alginate dialdehyde-gelatin based bioink with methylcellulose for improving printability. Mater Sci Eng C Mater Biol Appl 2021; 128:112336. [PMID: 34474887 DOI: 10.1016/j.msec.2021.112336] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/23/2021] [Accepted: 07/23/2021] [Indexed: 11/26/2022]
Abstract
This study used methylcellulose (MC) to improve the printability of the alginate dialdehyde-gelatin (ADA-GEL) based bioink. The printability as well as the capability to maintain shape fidelity of ADA-GEL could be enhanced by the addition of 9% (w/v) MC. Moreover, the properties of the ink crosslinked with Ca2+ and Ba2+ were investigated. The samples crosslinked with Ba2+ were more stable and stiffer than the Ca2+ crosslinked samples. However, both Ca2+ and Ba2+ crosslinked samples exhibited a similar trend of MC release during incubation under cell culture conditions. The toxicity test indicated that both samples (crosslinked with Ca2+ and Ba2+) exhibited no toxic potential. The fabrication of cell-laden constructs using the developed bioinks was evaluated. The viability of ST2 cells in Ba2+ crosslinked samples increased while for Ca2+ crosslinked samples, a decreased viability was observed over the incubation time. After 21 days, cell spreading in the hydrogels crosslinked with Ba2+ occurred. However, a certain degree of cell damage was observed after incorporating the cells in the high viscosity bioink.
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Affiliation(s)
- Supachai Reakasame
- Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstr.6, 91058 Erlangen, Germany
| | - Dalia Dranseikiene
- Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstr.6, 91058 Erlangen, Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstr.7, 91058 Erlangen, Germany
| | - Kai Zheng
- Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstr.6, 91058 Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstr.7, 91058 Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstr.6, 91058 Erlangen, Germany.
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36
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Luo X, Schubert DW. Examining the contribution of factors affecting the electrical behavior of poly(methyl methacrylate)/graphene nanoplatelets composites. J Appl Polym Sci 2021. [DOI: 10.1002/app.50694] [Citation(s) in RCA: 5] [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] [Indexed: 01/23/2023]
Affiliation(s)
- Xiaoling Luo
- Institute of Polymer Materials, Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Dirk W. Schubert
- Institute of Polymer Materials, Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute Fürth Germany
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37
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Xu H, Qu M, Yang Q, Schubert DW. Investigating the electrical percolation threshold of ternary composite films with different compatibility between polymer blends. Journal of Polymer Engineering 2021. [DOI: 10.1515/polyeng-2021-0018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Electrical conductive of polystyrene (PS)/poly(butyl methacrylate) (PBMA)/carbon black (CB) and PS/poly (cyclohexyl methacrylate) (PChMA)/CB ternary composite films with different polymer blend ratios are prepared through solution casting. The percolation thresholds (ϕ
c
) of all the composite films before and after thermal annealing have been determined through the McLachlan GEM equation. Moreover, the PS/poly (methyl methacrylate) (PMMA)/CB and PS/poly (ethyl methacrylate) (PEMA)/CB films obtained from the same method while only considering conductivity after thermal annealing as well in this work for comparison. Though the CB particles are revealed to be located at only one polymer phase of all four different polymer blends, with compatibility between polymer blends increasing, the ternary composite films show different ϕ
c
behaviors by changing polymer blend ratios. In PS/PChMA/CB case, the phase separation between PChMA and PS cannot be observed under scanning electron microscope (SEM). After thermal annealing, all the ϕ
c
of PS/PChMA/CB films with different PS/PChMA ratios almost show a linear behavior instead of the double percolation behavior with PChMA content increasing. Suppose both ϕ
c
of binary systems (polymer A/filler and polymer B/filler) is determined. In that case, a linear behavior relationship between the ϕ
c
of the ternary composites (A + B + fillers) with the ratio of two polymers can be revealed when polymer A and B are miscible.
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Affiliation(s)
- Huagen Xu
- Zhuhai Seine Printing Technology Co., Ltd , 519075 Zhuhai , China
- Institute of Polymer Materials , Friedrich Alexander University Erlangen-Nuremberg , Martensstr. 7 , 91058 Erlangen , Germany
| | - Muchao Qu
- School of Automobile and Transportation Engineering , Guangdong Polytechnic Normal University , 510450 Guangzhou , China
| | - Qiancheng Yang
- Zhuhai Seine Printing Technology Co., Ltd , 519075 Zhuhai , China
| | - Dirk W. Schubert
- Institute of Polymer Materials , Friedrich Alexander University Erlangen-Nuremberg , Martensstr. 7 , 91058 Erlangen , Germany
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38
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Ding Y, Li W, Schubert DW, Boccaccini AR, Roether JA, Santos HA. An organic-inorganic hybrid scaffold with honeycomb-like structures enabled by one-step self-assembly-driven electrospinning. Mater Sci Eng C Mater Biol Appl 2021; 124:112079. [PMID: 33947571 DOI: 10.1016/j.msec.2021.112079] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/21/2021] [Accepted: 03/23/2021] [Indexed: 11/18/2022]
Abstract
Electrospun organic/inorganic hybrid scaffolds have been appealing in tissue regeneration owing to the integrated physicochemical and biological performances. However, the conventional electrospun scaffolds with non-woven structures usually failed to enable deep cell infiltration due to the densely stacked layers among the fibers. Herein, through self-assembly-driven electrospinning, a polyhydroxybutyrate/poly(ε-caprolactone)/58S sol-gel bioactive glass (PHB/PCL/58S) hybrid scaffold with honeycomb-like structures was prepared by manipulating the solution composition and concentration during a one-step electrospinning process. The mechanisms enabling the formation of self-assembled honeycomb-like structures were investigated through comparative studies using Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) between PHB/PCL/58S and PHB/PCL/sol-gel silica systems. The obtained honeycomb-like structure was built up from nanofibers with an average diameter of 370 nm and showed a bimodal distribution of pores: large polygonal pores up to hundreds of micrometers within the honeycomb-cells and irregular pores among the nanofibers ranging around few micrometers. The cell-materials interactions were further studied by culturing MG-63 osteoblast-like cells for 7 days. Cell viability, cell morphology and cell infiltration were comparatively investigated as well. While cells merely proliferated on the surface of non-woven structures, MG-63 cells showed extensive proliferation and deep infiltration up to 100-200 μm into the honeycomb-like structure. Moreover, the cellular spatial organization was readily regulated by the honeycomb-like pattern as well. Overall, the newly obtained hybrid scaffold may integrate the enhanced osteogenicity originating from the bioactive components, and the improved cell-material interactions brought by the honeycomb-like structure, making the new scaffold a promising candidate for tissue regeneration.
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Affiliation(s)
- Yaping Ding
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland.
| | - Wei Li
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland
| | - Dirk W Schubert
- Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany
| | - Judith A Roether
- Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany.
| | - Hélder A Santos
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland; Helsinki Institute of Life Science (HiLIFE), University of Helsinki, FI-00014 Helsinki, Finland.
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39
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Wang X, Liu X, Schubert DW. Highly Sensitive Ultrathin Flexible Thermoplastic Polyurethane/Carbon Black Fibrous Film Strain Sensor with Adjustable Scaffold Networks. Nanomicro Lett 2021; 13:64. [PMID: 34138311 PMCID: PMC8187661 DOI: 10.1007/s40820-021-00592-9] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 12/14/2020] [Indexed: 05/19/2023]
Abstract
In recently years, high-performance wearable strain sensors have attracted great attention in academic and industrial. Herein, a conductive polymer composite of electrospun thermoplastic polyurethane (TPU) fibrous film matrix-embedded carbon black (CB) particles with adjustable scaffold network was fabricated for high-sensitive strain sensor. This work indicated the influence of stereoscopic scaffold network structure built under various rotating speeds of collection device in electrospinning process on the electrical response of TPU/CB strain sensor. This structure makes the sensor exhibit combined characters of high sensitivity under stretching strain (gauge factor of 8962.7 at 155% strain), fast response time (60 ms), outstanding stability and durability (> 10,000 cycles) and a widely workable stretching range (0-160%). This high-performance, wearable, flexible strain sensor has a broad vision of application such as intelligent terminals, electrical skins, voice measurement and human motion monitoring. Moreover, a theoretical approach was used to analyze mechanical property and a model based on tunneling theory was modified to describe the relative change of resistance upon the applied strain. Meanwhile, two equations based from this model were first proposed and offered an effective but simple approach to analyze the change of number of conductive paths and distance of adjacent conductive particles.
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Affiliation(s)
- Xin Wang
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany
- National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, 450002, People's Republic of China
| | - Xianhu Liu
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany.
- National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, 450002, People's Republic of China.
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058, Erlangen, Germany.
- Bavarian Polymer Institute, Dr. Mack-Strasse 77, 90762, Fürth, Germany.
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40
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Taye EA, Roether JA, Schubert DW, Redda DT, Boccaccini AR. Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength. Materials (Basel) 2021; 14:ma14030511. [PMID: 33494326 PMCID: PMC7865735 DOI: 10.3390/ma14030511] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/22/2020] [Accepted: 01/13/2021] [Indexed: 11/25/2022]
Abstract
Novel hemp fiber reinforced geopolymer composites were fabricated. The matrix was a new geopolymer based on a mixture of red mud and fly ash. Chopped, randomly oriented hemp fibers were used as reinforcement. The mechanical properties of the geopolymer composite, such as diametral tensile (DTS) (or Brazilian tensile) strength and compressive strength (CS), were measured. The geopolymer composites reinforced with 9 vol.% and 3 vol.% hemp fiber yielded average DTS values of 5.5 MPa and average CS values of 40 MPa. Scanning electron microscopy (SEM) studies were carried out to evaluate the microstructure and fracture surfaces of the composites. The results indicated that the addition of hemp fiber is a promising approach to improve the mechanical strength as well as to modify the failure mechanism of the geopolymer, which changed from brittle to “pseudo-ductile”.
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Affiliation(s)
- Eyerusalem A. Taye
- Department of Materials Science and Engineering, Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany;
- Institute of Technology, School of Mechanical and Industrial Engineering, Addis Ababa University, Addis Ababa 7754, Ethiopia;
| | - Judith A. Roether
- Department of Materials Science and Engineering, Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstr 7, 91058 Erlangen, Germany; (J.A.R.); (D.W.S.)
| | - Dirk W. Schubert
- Department of Materials Science and Engineering, Institute of Polymer Materials, University of Erlangen-Nuremberg, Martensstr 7, 91058 Erlangen, Germany; (J.A.R.); (D.W.S.)
- Bavarian Polymer Institute, Key Lab Advanced Fiber Technology, 90762 Fürth, Germany
| | - Daniel T. Redda
- Institute of Technology, School of Mechanical and Industrial Engineering, Addis Ababa University, Addis Ababa 7754, Ethiopia;
| | - Aldo R. Boccaccini
- Department of Materials Science and Engineering, Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany;
- Bavarian Polymer Institute, Key Lab Advanced Fiber Technology, 90762 Fürth, Germany
- Correspondence:
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41
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Härth M, Dörnhöfer A, Kaschta J, Münstedt H, Schubert DW. Molecular structure and rheological properties of a poly(ethylene terephthalate) modified by two different chain extenders. J Appl Polym Sci 2020. [DOI: 10.1002/app.50110] [Citation(s) in RCA: 8] [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] [Indexed: 12/14/2022]
Affiliation(s)
- Michael Härth
- Institute of Polymer Materials Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Andrea Dörnhöfer
- Institute of Polymer Materials Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Joachim Kaschta
- Institute of Polymer Materials Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Helmut Münstedt
- Institute of Polymer Materials Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
| | - Dirk W. Schubert
- Institute of Polymer Materials Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
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42
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Qu M, Qin Y, Sun Y, Xu H, Schubert DW, Zheng K, Xu W, Nilsson F. Biocompatible, Flexible Strain Sensor Fabricated with Polydopamine-Coated Nanocomposites of Nitrile Rubber and Carbon Black. ACS Appl Mater Interfaces 2020; 12:42140-42152. [PMID: 32816448 DOI: 10.1021/acsami.0c11937] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 06/11/2023]
Abstract
A flexible, biocompatible, nitrile butadiene rubber (NBR)-based strain sensor with high stretchability, good sensitivity, and excellent repeatability is presented for the first time. Carbon black (CB) particles were embedded into an NBR matrix via a dissolving-coating technique, and the obtained NBR/CB composite was coated with polydopamine (PDA) to preserve the CB layer. The mechanical properties of the NBR films were found to be significantly improved with the addition of CB and PDA, and the produced composite films were noncytotoxic and highly biocompatible. Strain-sensing tests showed that the uncoated CB/NBR films possess a high sensing range (strain of ∼550%) and good sensitivity (gauge factor of 52.2), whereas the PDA/NBR/CB films show a somewhat reduced sensing range (strain of ∼180%) but significantly improved sensitivity (gauge factor of 346). The hysteresis curves obtained from cyclic strain-sensing tests demonstrate the prominent robustness of the sensor material. Three novel equations were developed to accurately describe the uniaxial and cyclic strain-sensing behavior observed for the investigated strain sensors. Gloves and knee/elbow covers were produced from the films, revealing that the signals generated by different finger, elbow, and knee movements are easily distinguishable, thus confirming that the PDA/NBR/CB composite films can be used in a wide range of wearable strain sensor applications.
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Affiliation(s)
- Muchao Qu
- School of Automobile and Transportation Engineering, Guangdong Polytechnic Normal University, 510450 Guangzhou, China
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
| | - Yijing Qin
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
| | - Yue Sun
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
| | - Huagen Xu
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
| | - Kai Zheng
- Institute of Biomaterials, Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Wei Xu
- School of Automobile and Transportation Engineering, Guangdong Polytechnic Normal University, 510450 Guangzhou, China
| | - Fritjof Nilsson
- School of Chemical Science and Engineering, Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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43
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Müller SJ, Mirzahossein E, Iftekhar EN, Bächer C, Schrüfer S, Schubert DW, Fabry B, Gekle S. Flow and hydrodynamic shear stress inside a printing needle during biofabrication. PLoS One 2020; 15:e0236371. [PMID: 32706802 PMCID: PMC7380612 DOI: 10.1371/journal.pone.0236371] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 07/02/2020] [Indexed: 01/02/2023] Open
Abstract
We present a simple but accurate algorithm to calculate the flow and shear rate profile of shear thinning fluids, as typically used in biofabrication applications, with an arbitrary viscosity-shear rate relationship in a cylindrical nozzle. By interpolating the viscosity with a set of power-law functions, we obtain a mathematically exact piecewise solution to the incompressible Navier-Stokes equation. The algorithm is validated with known solutions for a simplified Carreau-Yasuda fluid, full numerical simulations for a realistic chitosan hydrogel as well as experimental velocity profiles of alginate and chitosan solutions in a microfluidic channel. We implement the algorithm in an easy-to-use Python tool, included as Supplementary Material, to calculate the velocity and shear rate profile during the printing process, depending on the shear thinning behavior of the bioink and printing parameters such as pressure and nozzle size. We confirm that the shear stress varies in an exactly linear fashion, starting from zero at the nozzle center to the maximum shear stress at the wall, independent of the shear thinning properties of the bioink. Finally, we demonstrate how our method can be inverted to obtain rheological bioink parameters in-situ directly before or even during printing from experimentally measured flow rate versus pressure data.
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Affiliation(s)
| | - Elham Mirzahossein
- Department of Phyiscs, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Emil N. Iftekhar
- Department of Phyiscs, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Bächer
- Biofluid Simulation and Modeling, Universität Bayreuth, Bayreuth, Germany
| | - Stefan Schrüfer
- Institute of Polymer Materials, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Fürth, Germany
| | - Dirk W. Schubert
- Institute of Polymer Materials, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
- KeyLab Advanced Fiber Technology, Bavarian Polymer Institute, Fürth, Germany
| | - Ben Fabry
- Department of Phyiscs, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Stephan Gekle
- Biofluid Simulation and Modeling, Universität Bayreuth, Bayreuth, Germany
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44
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Yang G, Schubert DW, Nilsson F, Qu M, Redel M. A Study of a Novel Synergy Definition for Ternary CB/CNT Composites Suggesting a Representative Model for CB and CNT. MACROMOL THEOR SIMUL 2020. [DOI: 10.1002/mats.202000035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Guanda Yang
- Institute of Polymer MaterialsFriedrich‐Alexander‐University Erlangen‐Nuremberg Martensstr. 7 Erlangen 91058 Germany
- Bavarian Polymer InstituteKeyLab Advanced Fiber Technology Dr.‐Mack‐Straße 77 Fürth 90762 Germany
| | - Dirk W. Schubert
- Bavarian Polymer InstituteKeyLab Advanced Fiber Technology Dr.‐Mack‐Straße 77 Fürth 90762 Germany
| | - Fritjof Nilsson
- Institute of Polymer MaterialsFriedrich‐Alexander‐University Erlangen‐Nuremberg Martensstr. 7 Erlangen 91058 Germany
- KTH Royal Institute of TechnologySchool of Chemical Science and EngineeringFibre and Polymer Technology Stockholm SE 10044 Sweden
| | - Muchao Qu
- Institute of Polymer MaterialsFriedrich‐Alexander‐University Erlangen‐Nuremberg Martensstr. 7 Erlangen 91058 Germany
- Bavarian Polymer InstituteKeyLab Advanced Fiber Technology Dr.‐Mack‐Straße 77 Fürth 90762 Germany
| | - Michael Redel
- Institute of Polymer MaterialsFriedrich‐Alexander‐University Erlangen‐Nuremberg Martensstr. 7 Erlangen 91058 Germany
- Bavarian Polymer InstituteKeyLab Advanced Fiber Technology Dr.‐Mack‐Straße 77 Fürth 90762 Germany
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45
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Hazur J, Detsch R, Karakaya E, Kaschta J, Teßmar J, Schneidereit D, Friedrich O, Schubert DW, Boccaccini AR. Improving alginate printability for biofabrication: establishment of a universal and homogeneous pre-crosslinking technique. Biofabrication 2020; 12:045004. [PMID: 32485692 DOI: 10.1088/1758-5090/ab98e5] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Many different biofabrication approaches as well as a variety of bioinks have been developed by researchers working in the field of tissue engineering. A main challenge for bioinks often remains the difficulty to achieve shape fidelity after printing. In order to overcome this issue, a homogeneous pre-crosslinking technique, which is universally applicable to all alginate-based materials, was developed. In this study, the Young's Modulus after post-crosslinking of selected hydrogels, as well as the chemical characterization of alginate in terms of M/G ratio and molecular weight, were determined. With our technique it was possible to markedly enhance the printability of a 2% (w/v) alginate solution, without using a higher polymer content, fillers or support structures. 3D porous scaffolds with a height of around 5 mm were printed. Furthermore, the rheological behavior of different pre-crosslinking degrees was studied. Shear forces on cells as well as the flow profile of the bioink inside the printing nozzle during the process were estimated. A high cell viability of printed NIH/3T3 cells embedded in the novel bioink of more than 85% over a time period of two weeks could be observed.
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Affiliation(s)
- Jonas Hazur
- Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstr.6, 91058, Erlangen, Germany
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46
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Xu H, Schubert DW. Electrical conductivity of polystyrene/poly(n-alkyl methacrylate)s / carbon nanotube ternary composite casting films. J Polym Res 2020. [DOI: 10.1007/s10965-020-02141-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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47
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Dranseikiene D, Schrüfer S, Schubert DW, Reakasame S, Boccaccini AR. Cell-laden alginate dialdehyde-gelatin hydrogels formed in 3D printed sacrificial gel. J Mater Sci Mater Med 2020; 31:31. [PMID: 32152812 PMCID: PMC7062650 DOI: 10.1007/s10856-020-06369-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Accepted: 02/20/2020] [Indexed: 06/10/2023]
Abstract
Alginate dialdehyde-gelatin (ADA-GEL) hydrogels have been reported to be suitable matrices for cell encapsulation. In general, application of ADA-GEL as bioink has been limited to planar structures due to its low viscosity. In this work, ring shaped constructs of ADA-GEL hydrogel were fabricated by casting the hydrogel into sacrificial molds which were 3D printed from 9% methylcellulose and 5% gelatin. Dissolution of the supporting structure was observed during the 1st week of sample incubation. In addition, the effect of different crosslinkers (Ba2+ and Ca2+) on the physicochemical properties of ADA-GEL and on the behavior of encapsulated MG-63 cells was investigated. It was found that Ba2+ crosslinked network had more than twice higher storage modulus, and mass decrease to 70% during incubation compared to 42% in case of hydrogels crosslinked with Ca2+. In addition, faster increase in cell viability during incubation and earlier cell network formation were observed after Ba2+ crosslinking. No negative effects on cell activity due to the use of sacrificial materials were observed. The approach presented here could be further developed for cell-laden ADA-GEL bioink printing into complex 3D structures.
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Affiliation(s)
- Dalia Dranseikiene
- Institute of Biomaterials, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Stefan Schrüfer
- Institute for Polymer Materials, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Dirk W Schubert
- Institute for Polymer Materials, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Supachai Reakasame
- Institute of Biomaterials, University of Erlangen-Nuremberg, 91058, Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, University of Erlangen-Nuremberg, 91058, Erlangen, Germany.
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48
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Tolksdorf J, Horch RE, Grüner JS, Schmid R, Kengelbach-Weigand A, Schubert DW, Werner S, Schneidereit D, Friedrich O, Ludolph I. Size matters-in vitro behaviour of human fibroblasts on textured silicone surfaces with different pore sizes. J Mater Sci Mater Med 2020; 31:23. [PMID: 32016560 PMCID: PMC6997250 DOI: 10.1007/s10856-020-6360-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 01/07/2020] [Indexed: 05/14/2023]
Abstract
Capsular contracture remains a challenge in plastic surgery and represents one of the most common postoperative complications following alloplastic breast reconstruction. The impact of the surface structure of silicone implants on the foreign body reaction and the behaviour of connective tissue-producing cells has already been discussed. The aim of this study was to investigate different pore sizes of silicone surfaces and their influence on human fibroblasts in an in vitro model. Four different textures (no, fine, medium and coarse texture) produced with the salt-loss technique, have been assessed in an in vitro model. Human fibroblasts were seeded onto silicone sheets and evaluated after 1, 4 and 7 days microscopically, with viability assay and gene expression analysis. Comparing the growth behaviour and adhesion of the fibroblasts on the four different textures, a dense cell layer, good adhesion and bridge-building ability of the cells could be observed for the fine and medium texture. Cell number and viability of the cells were increasing during the time course of experiments on every texture. TGFß1 was lowest expressed on the fine and medium texture indicating a trend for decreased fibrotic activity. For silicone surfaces produced with the salt-loss technique, we were able to show an antifibrotic effect of smaller sized pores. These findings underline the hypothesis of a key role of the implant surface and the pore size and pore structure in preventing capsular contracture.
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Affiliation(s)
- Julia Tolksdorf
- Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Raymund E Horch
- Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Jasmin S Grüner
- Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Rafael Schmid
- Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Annika Kengelbach-Weigand
- Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Krankenhausstraße 12, 91054, Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Martensstrasse 7, 91058, Erlangen, Germany
| | - Siegfried Werner
- Institute of Polymer Materials, Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Martensstrasse 7, 91058, Erlangen, Germany
| | - Dominik Schneidereit
- Institute of Medical Biotechnology, Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany
| | - Ingo Ludolph
- Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, University Hospital of Erlangen Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Krankenhausstraße 12, 91054, Erlangen, Germany.
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49
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Qu M, Nilsson F, Qin Y, Yang G, Gao Q, Xu W, Liu X, Schubert DW. Electrical conductivity of anisotropic PMMA composite filaments with aligned carbon fibers - predicting the influence of measurement direction. RSC Adv 2020; 10:4156-4165. [PMID: 35492652 PMCID: PMC9049041 DOI: 10.1039/c9ra08105d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Accepted: 12/16/2019] [Indexed: 11/21/2022] Open
Abstract
In order to study the electrical conductivity of anisotropic PMMA/carbon fiber (CF) composites, cylindrical PMMA/CF filaments were extruded through a capillary rheometer, resulting in an induced CF orientation along the extrusion direction. The aspect ratios of the CFs in the filaments were accurately regulated using a two-step melt mixing process. By measuring the vertical and horizontal resistances of filaments where the outermost layer was successively peeled off, the anisotropic conductivities could be calculated. This was done using a novel analytical model where each cylindrical composite filament was defined as a structure consisting of three concentric cylinders with potentially different conductivities and CF orientations. The electrical conductivity increased with the degree of fiber orientation along the voltage direction and the effects of anisotropy and measurement direction were incorporated into the (isotropic) McLachlan equation. The required distance for electrical contact between the CFs was calculated to be 16 nm. Finite element (FEM) simulations were successfully utilized to confirm the data. Revealed logarithm longitude electrical conductivity σ∥ and transverse electrical conductivity σ⊥ of PMMA/CF composite filaments.![]()
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Affiliation(s)
- Muchao Qu
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg Martensstr. 7 91058 Erlangen Germany .,Bavarian Polymer Institute (BPI), Key Lab 'Advanced Fiber Technologies' Dr-Mack-Str. 77 90762 Fürth Germany
| | - Fritjof Nilsson
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Fibre and Polymer Technology SE-100 44 Stockholm Sweden
| | - Yijing Qin
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg Martensstr. 7 91058 Erlangen Germany .,Bavarian Polymer Institute (BPI), Key Lab 'Advanced Fiber Technologies' Dr-Mack-Str. 77 90762 Fürth Germany
| | - Guanda Yang
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg Martensstr. 7 91058 Erlangen Germany .,Bavarian Polymer Institute (BPI), Key Lab 'Advanced Fiber Technologies' Dr-Mack-Str. 77 90762 Fürth Germany
| | - Qun Gao
- School of Automobile and Transportation Engineering, Guangdong Polytechnic Normal University Guangzhou 510450 China
| | - Wei Xu
- School of Automobile and Transportation Engineering, Guangdong Polytechnic Normal University Guangzhou 510450 China
| | - Xianhu Liu
- Key Laboratory of Materials Processing and Mold, Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University No. 97-1 Wenhua, Jinshui District Zhengzhou 450002 China
| | - Dirk W Schubert
- Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg Martensstr. 7 91058 Erlangen Germany .,Bavarian Polymer Institute (BPI), Key Lab 'Advanced Fiber Technologies' Dr-Mack-Str. 77 90762 Fürth Germany
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50
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Rausch M, Böhringer D, Steinmann M, Schubert DW, Schrüfer S, Mark C, Fabry B. Measurement of Skeletal Muscle Fiber Contractility with High-Speed Traction Microscopy. Biophys J 2019; 118:657-666. [PMID: 31952805 DOI: 10.1016/j.bpj.2019.12.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 01/07/2023] Open
Abstract
We describe a technique for simultaneous quantification of the contractile forces and cytosolic calcium dynamics of muscle fibers embedded in three-dimensional biopolymer gels under auxotonic loading conditions. We derive a scaling law for linear elastic matrices such as basement membrane extract hydrogels (Matrigel) that allows us to measure contractile force from the shape of the relaxed and contracted muscle cell and the Young's modulus of the matrix without further knowledge of the matrix deformations surrounding the cell and without performing computationally intensive inverse force reconstruction algorithms. We apply our method to isolated mouse flexor digitorum brevis (FDB) fibers that are embedded in 10 mg/mL Matrigel. Upon electrical stimulation, individual FDB fibers show twitch forces of 0.37 ± 0.15 μN and tetanic forces (100-Hz stimulation frequency) of 2.38 ± 0.71 μN, corresponding to a tension of 0.44 ± 0.25 kPa and 2.53 ± 1.17 kPa, respectively. Contractile forces of FDB fibers increase in response to caffeine and the troponin-calcium stabilizer tirasemtiv, similar to responses measured in whole muscle. From simultaneous high-speed measurements of cell length changes and cytosolic calcium concentration using confocal line scanning at a frequency of 2048 Hz, we show that twitch and tetanic force responses to electric pulses follow the low-pass filtered calcium signal. In summary, we present a technically simple high-speed method for measuring contractile forces and cytosolic calcium dynamics of single muscle fibers. We expect that our method will help to reduce preparation time, costs, and the number of sacrificed animals needed for experiments such as drug testing.
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Affiliation(s)
- Martin Rausch
- Novartis Institutes for BioMedical Research, Basel, Switzerland.
| | - David Böhringer
- Department of Physics, Institute for Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | | | - Dirk W Schubert
- Department of Materials Science, Institute for Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Stefan Schrüfer
- Department of Materials Science, Institute for Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Christoph Mark
- Department of Physics, Institute for Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Ben Fabry
- Department of Physics, Institute for Polymer Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
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