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Bjorgvinsdottir O, Ferguson SJ, Snorradottir BS, Gudjonsson T, Wuertz-Kozak K. The influence of physical and spatial substrate characteristics on endothelial cells. Mater Today Bio 2024; 26:101060. [PMID: 38711934 PMCID: PMC11070711 DOI: 10.1016/j.mtbio.2024.101060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 03/10/2024] [Accepted: 04/13/2024] [Indexed: 05/08/2024] Open
Abstract
Cardiovascular diseases are a main cause of death worldwide, leading to a growing demand for medical devices to treat this patient group. Central to the engineering of such devices is a good understanding of the biology and physics of cell-surface interactions. In existing blood-contacting devices, such as vascular grafts, the interaction between blood, cells, and material is one of the main limiting factors for their long-term durability. An improved understanding of the material's chemical- and physical properties as well as its structure all play a role in how endothelial cells interact with the material surface. This review provides an overview of how different surface structures influence endothelial cell responses and what is currently known about the underlying mechanisms that guide this behavior. The structures reviewed include decellularized matrices, electrospun fibers, pillars, pits, and grated surfaces.
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Affiliation(s)
- Oddny Bjorgvinsdottir
- Faculty of Pharmaceutical Sciences, University of Iceland, Hofsvallagata 53, 107 Reykjavik, Iceland
| | - Stephen J. Ferguson
- Institute for Biomechanics, ETH Zurich, Gloriastrasse 37 / 39, 8092, Zurich, Switzerland
| | | | - Thorarinn Gudjonsson
- Faculty of Medicine, University of Iceland, Vatnsmyrarvegur 16, 101 Reykjavik, Iceland
| | - Karin Wuertz-Kozak
- Department of Biomedical Engineering, Rochester Institute of Technology (RIT), 160 Lomb Memorial Drive Bldg. 73, Rochester, NY, 14623, USA
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2
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Choi JS, Doo HM, Kim B, Lee SH, Sung SK, Go G, Suarez A, Kim Y, Weon BM, Choi BO, Kim HJ, Kim DH. NanoIEA: A Nanopatterned Interdigitated Electrode Array-Based Impedance Assay for Real-Time Measurement of Aligned Endothelial Cell Barrier Functions. Adv Healthc Mater 2024; 13:e2301124. [PMID: 37820720 PMCID: PMC10841753 DOI: 10.1002/adhm.202301124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 09/18/2023] [Indexed: 10/13/2023]
Abstract
A nanopatterned interdigitated electrode array (nanoIEA)-based impedance assay is developed for quantitative real-time measurement of aligned endothelial cell (EC) barrier functions in vitro. A bioinspired poly(3,4-dihydroxy-L-phenylalanine) (poly (l-DOPA)) coating is applied to improve the human brain EC adhesion onto the Nafion nanopatterned surfaces. It is found that a poly (l-DOPA)-coated Nafion grooved nanopattern makes the human brain ECs orient along the nanopattern direction. Aligned human brain ECs on Nafion nanopatterns exhibit increased expression of genes encoding tight and adherens junction proteins. Aligned human brain ECs also have enhanced impedance and resistance versus unaligned ones. Treatment with a glycogen synthase kinase-3 inhibitor (GSK3i) further increases impedance and resistance, suggesting synergistic effects occur on the cell-cell tightness of in vitro human brain ECs via a combination of anisotropic matrix nanotopography and GSK3i treatment. It is found that this enhanced cell-cell tightness of the combined approach is accompanied by increased expression of claudin protein. These data demonstrate that the proposed nanoIEA assay integrated with poly (l-DOPA)-coated Nafion nanopatterns and interdigitated electrode arrays can make not only biomimetic aligned ECs, but also enable real-time measurement of the enhanced barrier functions of aligned ECs via tighter cell-cell junctions.
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Affiliation(s)
- Jong Seob Choi
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States; Division of Advanced Materials Engineering, Kongju National University, Cheonan, Chungnam, 31080, South Korea
| | - Hyun Myung Doo
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, 06351, South Korea
| | - Byunggik Kim
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, United States
| | - Su Han Lee
- Digital Health Care Research Center, Gumi Electronics, and Information Technology Research Institute (GERI), Gumi, Gyeongbuk, 39253, South Korea
| | - Sang-keun Sung
- Digital Health Care Research Center, Gumi Electronics, and Information Technology Research Institute (GERI), Gumi, Gyeongbuk, 39253, South Korea
| | - Gwangjun Go
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Allister Suarez
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Yeseul Kim
- Soft Matter Physics Laboratory, School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea
| | - Byung Mook Weon
- Soft Matter Physics Laboratory, School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea
| | - Byung-Ok Choi
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, 06351, South Korea; Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea
| | - Hyung Jin Kim
- School of Electrical & Electronic Engineering, Ulsan College, Ulsan, 44610, South Korea
| | - Deok-Ho Kim
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
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3
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Berl AJ, Sklar JH, Yun YJ, Kalow JA. Side-Chain Engineering in Hydrophilic n-Type π-Conjugated Polymers for Enhanced Reactivity. ACS Macro Lett 2023; 12:503-509. [PMID: 37011181 DOI: 10.1021/acsmacrolett.3c00085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Minor changes to side chains in conjugated polymers (CPs) can have pronounced effects on polymer properties by altering backbone planarity, solubility, and interaction with ions. Here, we report the photocontrolled synthesis of hydrophilic CPs from Grignard monomers and find that switching from alkyl to oligo(ethylene glycol) (OEG) side chains changes their photoreactivity. Specifically, installing hydrophilic side chains on the same monomer core yields higher molecular weight polymers and allows polymerization to proceed with lower-energy red light. Additionally, we discover a side chain decomposition pathway for N-OEG monomers, which are prevalent in CP research. Decomposition can be overcome by adding an extra methylene unit in the side chains without compromising polymer molecular weight or hydrophilicity. Importantly, this polymerization does not require transition metal catalysts and is a promising approach to the preparation of n-type conjugated block copolymers.
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Affiliation(s)
- Alexandra J Berl
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Jonathan H Sklar
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Young Ju Yun
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Julia A Kalow
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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4
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Safety studies of polyethylene glycol–hydroxyapatite nanocomposites on Drosophila melanogaster: an in vivo model. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02284-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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5
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Antialgal Synergistic Polystyrene Blended with Polyethylene Glycol and Silver Sulfadiazine for Healthcare Applications. ADVANCES IN POLYMER TECHNOLOGY 2021. [DOI: 10.1155/2021/6627736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Polystyrene (PS) was blended with polyethylene glycol (PEG) and silver sulfadiazine (SS) with different weight proportions to form polymeric blends. These synthesized blends were preliminary characterized in terms of functional groups through the FTIR technique. All compositions were subjected to thermogravimetric analysis for studying thermal transition and were founded thermally stable even at 280°C. The zeta potential and average diameter of algal strains of Dictyosphaerium sp. (DHM1), Dictyosphaerium sp. (DHM2), and Pectinodesmus sp. (PHM3) were measured to be -32.7 mV, -33.0 mV, and -25.7 mV and 179.6 nm, 102.6 nm, and 70.4 nm, respectively. Upon incorporation of PEG and SS into PS blends, contact angles were decreased while hydrophilicity and surface energy were increased. However, increase of surface energy did not led to decrease of antialgal activities. This has indicated that biofilm adhesion is not a major antialgal factor in these blended materials. The synergetic effect of PEG and SS in PS blends has exhibited significant antialgal activity via the agar disk diffusion method. The PSPS10 composition with 10
PEG and 10
SS has exhibited highest inhibition zones 10.8 mm, 10.8 mm, and 11.3 mm against algal strains DHM1, DHM2, and DHM3, respectively. This thermally stable polystyrene blends with improved antialgal properties have potential for a wide range of applications including marine coatings.
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6
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Trentin LN, Pereira CS, Silveira RL, Hill S, Sorieul M, Skaf MS. Nanoscale Wetting of Crystalline Cellulose. Biomacromolecules 2021; 22:4251-4261. [PMID: 34515474 DOI: 10.1021/acs.biomac.1c00801] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cellulose possesses considerable potential for a wide range of sustainable applications. Nanocellulose-based material properties are primarily dependent on the structural surface characteristics of its crystalline planes. Experimental measurements of the affinity of crystalline nanocellulose surfaces with water are scarce and challenging to obtain. Therefore, the relative hydrophilicity of different cellulose allomorphs crystalline planes is often inferred from qualitative assessments of their surface and the exposition of polar groups to the solvent. This work investigates the relative hydrophilicity of cellulose surfaces using molecular dynamics simulations. The behavior of a water droplet laid on different crystal planes was used to determine their relative hydrophilicity. The water molecules fully spread onto highly hydrophilic surfaces. However, a water droplet placed on less hydrophilic surfaces equilibrates as an oblate spheroidal cap allowing the measurement of a contact angle. The results indicate that the Iα (010), Iα (11̅0), Iβ (010), and Iβ (110) faces, as well as the faces of human-made celluloses II and III_I (100), (11̅0), (010), and (110) are all highly hydrophilic. They all have a contact angle value inferior to 11°. Not unexpectedly, the Iα (001) and Iβ (100) surfaces are less hydrophilic with contact angles of 48 and 34°, respectively. However, the Iβ (11̅0) plane, often referred to as a hydrophilic surface, forms a contact angle of about 32°. The results are rationalized in terms of structure, exposure of hydroxyl groups to the solvent, and degree of cellulose-cellulose versus cellulose-water hydrogen bonds on each face. The simulations also show that the surface oxidation degree tunes the surface hydrophilicity in a nonlinear manner due to cooperative effects involving water-cellulose interactions. Our study helps us to understand how the degree of hydrophilicity of cellulose emerges from specific structural features of each crystalline surface.
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Affiliation(s)
- Lucas N Trentin
- Institute of Chemistry and Center for Computing in Engineering & Sciences, University of Campinas, Campinas, São Paulo 13084-862, Brazil
| | - Caroline S Pereira
- Institute of Chemistry and Center for Computing in Engineering & Sciences, University of Campinas, Campinas, São Paulo 13084-862, Brazil
| | - Rodrigo L Silveira
- Institute of Chemistry and Center for Computing in Engineering & Sciences, University of Campinas, Campinas, São Paulo 13084-862, Brazil.,Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-909, Brazil
| | - Stefan Hill
- Scion, Private Bag 3020, Rotorua 3046, New Zealand
| | | | - Munir S Skaf
- Institute of Chemistry and Center for Computing in Engineering & Sciences, University of Campinas, Campinas, São Paulo 13084-862, Brazil
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7
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Luminescent water dispersible core-shell – (Y/Eu/Li)VO4@APTES@Folate and (Y/Eu/Li)VO4@Fe3O4@PEG nanocomposites: Biocompatibility and induction heating within the threshold alternating magnetic field. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126826] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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8
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De France KJ, Xu F, Toufanian S, Chan KJ, Said S, Stimpson TC, González-Martínez E, Moran-Mirabal JM, Cranston ED, Hoare T. Multi-scale structuring of cell-instructive cellulose nanocrystal composite hydrogel sheets via sequential electrospinning and thermal wrinkling. Acta Biomater 2021; 128:250-261. [PMID: 33945881 DOI: 10.1016/j.actbio.2021.04.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 04/07/2021] [Accepted: 04/21/2021] [Indexed: 12/22/2022]
Abstract
Structured hydrogel sheets offer the potential to mimic the mechanics and morphology of native cell environments in vitro; however, controlling the morphology of such sheets across multiple length scales to give cells consistent multi-dimensional cues remains challenging. Here, we demonstrate a simple two-step process based on sequential electrospinning and thermal wrinkling to create nanocomposite poly(oligoethylene glycol methacrylate)/cellulose nanocrystal hydrogel sheets with a highly tunable multi-scale wrinkled (micro) and fibrous (nano) morphology. By varying the time of electrospinning, rotation speed of the collector, and geometry of the thermal wrinkling process, the hydrogel nanofiber density, fiber alignment, and wrinkle geometry (biaxial or uniaxial) can be independently controlled. Adhered C2C12 mouse myoblast muscle cells display a random orientation on biaxially wrinkled sheets but an extended morphology (directed preferentially along the wrinkles) on uniaxially wrinkled sheets. While the nanofiber orientation had a smaller effect on cell alignment, parallel nanofibers promoted improved cell alignment along the wrinkle direction while perpendicular nanofibers disrupted alignment. The highly tunable structures demonstrated are some of the most complex morphologies engineered into hydrogels to-date without requiring intensive micro/nanofabrication approaches and offer the potential to precisely regulate cell-substrate interactions in a "2.5D" environment (i.e. a surface with both micro- and nano-structured topographies) for in vitro cell screening or in vivo tissue regeneration. STATEMENT OF SIGNIFICANCE: While structured hydrogels can mimic the morphology of natural tissues, controlling this morphology over multiple length scales remains challenging. Furthermore, the incorporation of secondary morphologies within individual hydrogels via simple manufacturing techniques would represent a significant advancement in the field of structured biomaterials and an opportunity to study complex cell-biomaterial interactions. Herein, we leverage a two-step process based on electrospinning and thermal wrinkling to prepare structured hydrogels with microscale wrinkles and nanoscale fibers. Fiber orientation/density and wrinkle geometry can be independently controlled during the electrospinning and thermal wrinkling processes respectively, demonstrating the flexibility of this technique for creating well-defined multiscale hydrogel structures. Finally, we show that while wrinkle geometry is the major determinant of cell alignment, nanofiber orientation also plays a role in this process.
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9
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Choi JS, Tsui JH, Xu F, Lee SH, Lee HJ, Wang C, Kim HJ, Kim DH. Fabrication of nanomolded Nafion thin films with tunable mechanical and electrical properties using thermal evaporation-induced capillary force lithography. ADVANCED MATERIALS INTERFACES 2021; 8:2002005. [PMID: 33996383 PMCID: PMC8115721 DOI: 10.1002/admi.202002005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Indexed: 06/12/2023]
Abstract
In this paper, we report a simple and facile method to fabricate nanomolded Nafion thin films with tunable mechanical, and electrical properties. To achieve this, we combine a novel thermal evaporation-induced capillary force lithography method with swelling process to obtain enhanced pattern fidelity in nanomolded Nafion films. We demonstrate that structural fidelity and mechanical properties of patterned Nafion thin films can be modulated by changing fabrication parameters such as swelling time, Nafion polymer concentration, and curing temperature. Interestingly, we also find that impedance properties of nanomolded Nafion thin films are associated with the Nafion polymer concentration and curing temperature. In particular, 20% Nafion thin films exhibit greater impedance stability and lower impedance values than 5% Nafion thin films at lower frequencies. Moreover, curing temperature-specific impedance changes are observed. These results suggest that capillary lithography can be used to fabricate Nafion nanostructures with high pattern fidelity capable of modifying mechanical and electrical properties of Nafion thin films.
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Affiliation(s)
- Jong Seob Choi
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Jonathan H Tsui
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Fei Xu
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Su Han Lee
- Digital Healthcare Research Center, Gumi Electronics and Information Technology Research Institute (GERI), 350-27, Gumidaero, Gumi, Gyeongbuk 39253, Republic of Korea
| | - Heon Joon Lee
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Chao Wang
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States
| | - Hyung Jin Kim
- Digital Healthcare Research Center, Gumi Electronics and Information Technology Research Institute (GERI), 350-27, Gumidaero, Gumi, Gyeongbuk 39253, Republic of Korea
| | - Deok-Ho Kim
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States; Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, United States; Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, United States
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10
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Li H, Zhao H, Yao L, Zhang L, Cheng Z, Zhu X. Photocontrolled bromine–iodine transformation reversible-deactivation radical polymerization: facile synthesis of star copolymers and unimolecular micelles. Polym Chem 2021. [DOI: 10.1039/d1py00006c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A facile strategy of synthesizing star copolymers was successfully established via photocontrolled BIT-RDRP. The obtained copolymers have well-defined four-arm amphiphilic block architecture and can form stable unimolecular micelles in water.
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Affiliation(s)
- Haihui Li
- Suzhou key Laboratory of Macromolecular Design and Precision Synthesis; Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- China
| | - Haitao Zhao
- Suzhou key Laboratory of Macromolecular Design and Precision Synthesis; Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- China
| | - Lan Yao
- Suzhou key Laboratory of Macromolecular Design and Precision Synthesis; Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- China
| | - Lifen Zhang
- Suzhou key Laboratory of Macromolecular Design and Precision Synthesis; Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- China
| | - Zhenping Cheng
- Suzhou key Laboratory of Macromolecular Design and Precision Synthesis; Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- China
| | - Xiulin Zhu
- Suzhou key Laboratory of Macromolecular Design and Precision Synthesis; Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- China
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11
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Tahk D, Bang S, Hyung S, Lim J, Yu J, Kim J, Jeon NL, Kim HN. Self-detachable UV-curable polymers for open-access microfluidic platforms. LAB ON A CHIP 2020; 20:4215-4224. [PMID: 33170919 DOI: 10.1039/d0lc00604a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This study presents an ultraviolet (UV)-curable polymer which is applicable to open-access microfluidic platforms. The UV-curable polymer was prepared by mixing trimethylolpropane triacrylate (TMPTA), 1,6-hexanediol diacrylate (HDDA), polyethylene glycol-diacrylate (PEG-DA), and Irgacure 184. The polymer resin is optically transparent before and after UV-assisted curing and showed good biocompatibility when culturing multiple types of cells on the nanopatterned polymer substrate. The polymer has good adhesion with poly(dimethylsiloxane) (PDMS) even under large deformation and showed a low swelling ratio when exposed to water, suggesting a possibility to be used as a substrate for an organ on a chip. Furthermore, because the polymers have controllable hydrolysis ability depending on the composition, long-term 3D cell culture and subsequent biological analysis with harvested cells are possible. The self-detachable synthesized UV-curable polymer may help the advancement of biomedical studies using in vitro cell culture.
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Affiliation(s)
- Dongha Tahk
- Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Seokyoung Bang
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea.
| | - Sujin Hyung
- Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Jungeun Lim
- Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - James Yu
- Interdisciplinary Program for Program for Bioengineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jinhyun Kim
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea.
| | - Noo Li Jeon
- Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea. and Interdisciplinary Program for Program for Bioengineering, Seoul National University, Seoul, 08826, Republic of Korea and World Class University Program on Multiscale Mechanical Design, Seoul National University, Seoul 08826, Republic of Korea and Institute of Advanced Machines and Design, Seoul National University, Seoul 08826, Republic of Korea
| | - Hong Nam Kim
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea. and Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Republic of Korea
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12
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Bugg D, Bretherton R, Kim P, Olszewski E, Nagle A, Schumacher AE, Chu N, Gunaje J, DeForest CA, Stevens K, Kim DH, Davis J. Infarct Collagen Topography Regulates Fibroblast Fate via p38-Yes-Associated Protein Transcriptional Enhanced Associate Domain Signals. Circ Res 2020; 127:1306-1322. [PMID: 32883176 DOI: 10.1161/circresaha.119.316162] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
RATIONALE Myocardial infarction causes spatial variation in collagen organization and phenotypic diversity in fibroblasts, which regulate the heart's ECM (extracellular matrix). The relationship between collagen structure and fibroblast phenotype is poorly understood but could provide insights regarding the mechanistic basis for myofibroblast heterogeneity in the injured heart. OBJECTIVE To investigate the role of collagen organization in cardiac fibroblast fate determination. METHODS AND RESULTS Biomimetic topographies were nanofabricated to recapitulate differential collagen organization in the infarcted mouse heart. Here, adult cardiac fibroblasts were freshly isolated and cultured on ECM topographical mimetics for 72 hours. Aligned mimetics caused cardiac fibroblasts to elongate while randomly organized topographies induced circular morphology similar to the disparate myofibroblast morphologies measured in vivo. Alignment cues also induced myofibroblast differentiation, as >60% of fibroblasts formed αSMA (α-smooth muscle actin) stress fibers and expressed myofibroblast-specific ECM genes like Postn (periostin). By contrast, random organization caused 38% of cardiac fibroblasts to express αSMA albeit with downregulated myofibroblast-specific ECM genes. Coupling topographical cues with the profibrotic agonist, TGFβ (transforming growth factor beta), additively upregulated myofibroblast-specific ECM genes independent of topography, but only fibroblasts on flat and randomly oriented mimetics had increased percentages of fibroblasts with αSMA stress fibers. Increased tension sensation at focal adhesions induced myofibroblast differentiation on aligned mimetics. These signals were transduced by p38-YAP (yes-associated protein)-TEAD (transcriptional enhanced associate domain) interactions, in which both p38 and YAP-TEAD (yes-associated protein transcriptional enhanced associate domain) binding were required for myofibroblast differentiation. By contrast, randomly oriented mimetics did not change focal adhesion tension sensation or enrich for p38-YAP-TEAD interactions, which explains the topography-dependent diversity in fibroblast phenotypes observed here. CONCLUSIONS Spatial variations in collagen organization regulate cardiac fibroblast phenotype through mechanical activation of p38-YAP-TEAD signaling, which likely contribute to myofibroblast heterogeneity in the infarcted myocardium.
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Affiliation(s)
- Darrian Bugg
- Pathology (D.B., J.G., K.S., J.D.), University of Washington, Seattle.,Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
| | - Ross Bretherton
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle.,Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
| | - Peter Kim
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle
| | - Emily Olszewski
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle.,Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
| | - Abigail Nagle
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle.,Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
| | | | - Nick Chu
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle
| | - Jagadambika Gunaje
- Pathology (D.B., J.G., K.S., J.D.), University of Washington, Seattle.,Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
| | - Cole A DeForest
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle.,Institute for Stem Cell and Regenerative Medicine (C.A.D., K.S., J.D.), University of Washington, Seattle.,Chemical Engineering (C.A.D.), University of Washington, Seattle
| | - Kelly Stevens
- Bioengineering (R.B., P.K., E.O., A.N., N.C., C.A.D., K.S., J.D.), University of Washington, Seattle.,Pathology (D.B., J.G., K.S., J.D.), University of Washington, Seattle.,Institute for Stem Cell and Regenerative Medicine (C.A.D., K.S., J.D.), University of Washington, Seattle.,Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
| | - Deok-Ho Kim
- Biomedical Engineering, Johns Hopkins University, Baltimore, MD (D.-H.K.).,Medicine, Johns Hopkins School of Medicine, Baltimore, MD (D.-H.K.)
| | - Jennifer Davis
- Center for Cardiovascular Biology (D.B., R.B., E.O., A.N., J.G., K.S., J.D.), University of Washington, Seattle
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Cong S, Creamer A, Fei Z, Hillman SAJ, Rapley C, Nelson J, Heeney M. Tunable Control of the Hydrophilicity and Wettability of Conjugated Polymers by a Postpolymerization Modification Approach. Macromol Biosci 2020; 20:e2000087. [PMID: 32537851 DOI: 10.1002/mabi.202000087] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 03/28/2020] [Indexed: 11/08/2022]
Abstract
A facile method to prepare hydrophilic polymers by a postpolymerization nucleophillic aromatic substitution reaction of fluoride on an emissive conjugated polymer (CP) backbone is reported. Quantitative functionalization by a series of monofunctionalized ethylene glycol oligomers, from dimer to hexamer, as well as with high molecular weight polyethylene glycol is demonstrated. The length of the ethylene glycol sidechains is shown to have a direct impact on the surface wettability of the polymer, as well as its solubility in polar solvents. However, the energetics and band gap of the CPs remain essentially constant. This method therefore allows an easy way to modulate the wettability and solubility of CP materials for a diverse series of applications.
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Affiliation(s)
- Shengyu Cong
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Adam Creamer
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Zhuping Fei
- Institute of Molecular Plus, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, P. R. China
| | - Sam A J Hillman
- Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Charlotte Rapley
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Jenny Nelson
- Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Martin Heeney
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, White City Campus, London, W12 0BZ, UK
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14
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Deng J, Saleem M, Jia Q, Ding Y, Liu Y, Chen Y. Synthesis, surface wettability, and thermal property of poly(ε-caprolactone)-based polyurethane bearing triethylene glycol monomethyl as side chain. REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2020.104506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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16
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De France KJ, Babi M, Vapaavuori J, Hoare T, Moran-Mirabal J, Cranston ED. 2.5D Hierarchical Structuring of Nanocomposite Hydrogel Films Containing Cellulose Nanocrystals. ACS APPLIED MATERIALS & INTERFACES 2019; 11:6325-6335. [PMID: 30668100 DOI: 10.1021/acsami.8b16232] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Although two-dimensional hydrogel thin films have been applied across many biomedical applications, creating higher dimensionality structured hydrogel interfaces would enable potentially improved and more biomimetic hydrogel performance in biosensing, bioseparations, tissue engineering, drug delivery, and wound healing applications. Herein, we present a new and simple approach to control the structure of hydrogel thin films in 2.5D. Hybrid suspensions containing cellulose nanocrystals (CNCs) and aldehyde- or hydrazide-functionalized poly(oligoethylene glycol methacrylate) (POEGMA) were spin-coated onto prestressed polystyrene substrates to form cross-linked hydrogel thin films. The films were then structured via thermal shrinking, with control over the direction of shrinking leading to the formation of biaxial, uniaxial, or hierarchical wrinkles. Notably, POEGMA-only hydrogel thin films (without CNCs) did not form uniform wrinkles due to partial dewetting from the substrate during shrinking. Topographical feature sizes of CNC-POEGMA films could be tuned across 2 orders of magnitude (from ∼300 nm to 20 μm) by varying the POEGMA concentration, the length of poly(ethylene glycol) side chains in the polymer, and/or the overall film thickness. Furthermore, by employing adhesive masks during the spin-coating process, structured films with gradient wrinkle sizes can be fabricated. This precise control over both wrinkle size and wrinkle topography adds a level of functionality that to date has been lacking in conventional hydrogel networks.
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Affiliation(s)
- Kevin J De France
- Department of Chemical Engineering , McMaster University , 1280 Main Street West , Hamilton , ON L8S 4L8 , Canada
| | - Mouhanad Babi
- Department of Chemistry and Chemical Biology , McMaster University , 1280 Main Street West , Hamilton , ON L8S 4M1 , Canada
| | - Jaana Vapaavuori
- Department of Chemistry , University of Montreal , C.P. 6128 Succursale Centre-ville , Montreal , QC H3C 3J7 , Canada
| | - Todd Hoare
- Department of Chemical Engineering , McMaster University , 1280 Main Street West , Hamilton , ON L8S 4L8 , Canada
| | - Jose Moran-Mirabal
- Department of Chemistry and Chemical Biology , McMaster University , 1280 Main Street West , Hamilton , ON L8S 4M1 , Canada
| | - Emily D Cranston
- Department of Chemical Engineering , McMaster University , 1280 Main Street West , Hamilton , ON L8S 4L8 , Canada
- Department of Wood Science , University of British Columbia , 2424 Main Mall , Vancouver , BC V6T 1Z4 , Canada
- Department of Chemical and Biological Engineering , University of British Columbia , 2360 East Mall , Vancouver , BC V6T 1Z3 , Canada
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17
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Ziąbka M, Dziadek M, Menaszek E. Biocompatibility of Poly(acrylonitrile-butadiene-styrene) Nanocomposites Modified with Silver Nanoparticles. Polymers (Basel) 2018; 10:polym10111257. [PMID: 30961182 PMCID: PMC6401987 DOI: 10.3390/polym10111257] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 11/06/2018] [Accepted: 11/11/2018] [Indexed: 01/02/2023] Open
Abstract
We evaluated the biological, mechanical, and surface properties of polymer nanocomposites manufactured via plastics processing, extrusion, and injection moulding. The aim of this study was to identify the interaction of fibroblasts and osteoblasts with materials intended for middle ear implants. We examined if silver nanoparticles (AgNPs) may change the mechanical parameters of the polymer nanocomposites. In our study, the biostable polymer of thermoplastic acrylonitrile-butadiene-styrene (ABS) copolymer was used. Silver nanoparticles were applied as a modifier. We discuss surface parameters of the materials, including wettability and roughness, and evaluated the microstructure. The mechanical parameters, such as the Young's modulus and tensile strength, were measured. Cytotoxicity tests were conducted on two cell lines: Hs680.Tr human fibroblasts and Saos-2 human osteoblasts. Cell viability, proliferation, and morphology in direct contact with nanocomposites were tested. Based on the results, the incorporated modifier was found to affect neither the number of osteoblasts nor the fibroblast cells. However, the addition of AgNPs had a relatively small effect on the cytotoxicity of the materials. A slight increase in the cytotoxicity of the test materials was observed with respect to the control, with the cytotoxicity of the materials tending to decrease after seven days for osteoblast cells, whereas it remained steady for fibroblasts. Based on optical microscope observation, the shape and morphology of the adhered cells were evaluated. After seven days of culture, fibroblasts and osteoblasts were properly shaped and evenly settled on the surface of both the pure polymer and the silver nanoparticle-modified composite. Water droplet tests demonstrated increased hydrophilicity when adding the AgNPs to ABS matrices, whereas roughness tests did not show changes in the surface topography of the investigated samples. The 0.5% by weight incorporation of AgNPs into ABS matrices did not influence the mechanical properties.
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Affiliation(s)
- Magdalena Ziąbka
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, al. Mickiewicza 30, 30-059 Krakow, Poland.
| | - Michał Dziadek
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Glass Technology and Amorphous Coatings, al. Mickiewicza 30, 30-059 Krakow, Poland.
| | - Elżbieta Menaszek
- Jagiellonian University, Collegium Medicum, Faculty of Pharmacy, Department of Cytobiology, ul. Medyczna 9, 30-688 Krakow, Poland.
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Ariyasinghe NR, Lyra-Leite DM, McCain ML. Engineering cardiac microphysiological systems to model pathological extracellular matrix remodeling. Am J Physiol Heart Circ Physiol 2018; 315:H771-H789. [PMID: 29906229 PMCID: PMC6230901 DOI: 10.1152/ajpheart.00110.2018] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/27/2018] [Accepted: 06/08/2018] [Indexed: 12/11/2022]
Abstract
Many cardiovascular diseases are associated with pathological remodeling of the extracellular matrix (ECM) in the myocardium. ECM remodeling is a complex, multifactorial process that often contributes to declines in myocardial function and progression toward heart failure. However, the direct effects of the many forms of ECM remodeling on myocardial cell and tissue function remain elusive, in part because conventional model systems used to investigate these relationships lack robust experimental control over the ECM. To address these shortcomings, microphysiological systems are now being developed and implemented to establish direct relationships between distinct features in the ECM and myocardial function with unprecedented control and resolution in vitro. In this review, we will first highlight the most prominent characteristics of ECM remodeling in cardiovascular disease and describe how these features can be mimicked with synthetic and natural biomaterials that offer independent control over multiple ECM-related parameters, such as rigidity and composition. We will then detail innovative microfabrication techniques that enable precise regulation of cellular architecture in two and three dimensions. We will also describe new approaches for quantifying multiple aspects of myocardial function in vitro, such as contractility, action potential propagation, and metabolism. Together, these collective technologies implemented as cardiac microphysiological systems will continue to uncover important relationships between pathological ECM remodeling and myocardial cell and tissue function, leading to new fundamental insights into cardiovascular disease, improved human disease models, and novel therapeutic approaches.
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Affiliation(s)
- Nethika R Ariyasinghe
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California , Los Angeles, California
| | - Davi M Lyra-Leite
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California , Los Angeles, California
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California , Los Angeles, California
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California , Los Angeles, California
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Okoronkwo MU, Balonis M, Juenger M, Bauchy M, Neithalath N, Sant G. Stability of Calcium–Alumino Layered-Double-Hydroxide Nanocomposites in Aqueous Electrolytes. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b02618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Monday U. Okoronkwo
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | | | - Maria Juenger
- Department of Civil, Architectural and Environmental Engineering, University of Texas, Austin, Texas 78712, United States
| | | | - Narayanan Neithalath
- School of Sustainable Engineering and the Built-Environment, Arizona State University, Tempe, Arizona 85287, United States
| | - Gaurav Sant
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
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20
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An R, Dong Y, Zhu J, Rao C. Adhesion and friction forces in biofouling attachments to nanotube- and PEG- patterned TiO2 surfaces. Colloids Surf B Biointerfaces 2017; 159:108-117. [DOI: 10.1016/j.colsurfb.2017.07.067] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 07/25/2017] [Accepted: 07/26/2017] [Indexed: 11/25/2022]
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21
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Facile modulation of cell adhesion to a poly(ethylene glycol) diacrylate film with incorporation of polystyrene nano-spheres. Biomed Microdevices 2017; 18:107. [PMID: 27830453 DOI: 10.1007/s10544-016-0133-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Poly(ethylene glycol) diacrylate (PEGDA) is a common hydrogel that has been actively investigated for various tissue engineering applications owing to its biocompatibility and excellent mechanical properties. However, the native PEGDA films are known for their bio-inertness which can hinder cell adhesion, thereby limiting their applications in tissue engineering and biomedicine. Recently, nano composite technology has become a particularly hot topic, and has led to the development of new methods for delivering desired properties to nanomaterials. In this study, we added polystyrene nano-spheres (PS) into a PEGDA solution to synthesize a nano-composite film and evaluated its characteristics. The experimental results showed that addition of the nanospheres to the PEGDA film not only resulted in modification of the mechanical properties and surface morphology but further improved the adhesion of cells on the film. The tensile modulus showed clear dependence on the addition of PS, which enhanced the mechanical properties of the PEGDA-PS film. We attribute the high stiffness of the hybrid hydrogel to the formation of additional cross-links between polymeric chains and the nano-sphere surface in the network. The effect of PS on cell adhesion and proliferation was evaluated in L929 mouse fibroblast cells that were seeded on the surface of various PEGDA-PS films. Cells density increased with a larger PS concentration, and the cells displayed a spreading morphology on the hybrid films, which promoted cell proliferation. Impressively, cellular stiffness could also be modulated simply by tuning the concentration of nano-spheres. Our results indicate that the addition of PS can effectively tailor the physical and biological properties of PEGDA as well as the mechanical properties of cells, with benefits for biomedical and biotechnological applications.
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22
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Skoog SA, Kumar G, Narayan RJ, Goering PL. Biological responses to immobilized microscale and nanoscale surface topographies. Pharmacol Ther 2017; 182:33-55. [PMID: 28720431 DOI: 10.1016/j.pharmthera.2017.07.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cellular responses are highly influenced by biochemical and biomechanical interactions with the extracellular matrix (ECM). Due to the impact of ECM architecture on cellular responses, significant research has been dedicated towards developing biomaterials that mimic the physiological environment for design of improved medical devices and tissue engineering scaffolds. Surface topographies with microscale and nanoscale features have demonstrated an effect on numerous cellular responses, including cell adhesion, migration, proliferation, gene expression, protein production, and differentiation; however, relationships between biological responses and surface topographies are difficult to establish due to differences in cell types and biomaterial surface properties. Therefore, it is important to optimize implant surface feature characteristics to elicit desirable biological responses for specific applications. The goal of this work was to review studies investigating the effects of microstructured and nanostructured biomaterials on in vitro biological responses through fabrication of microscale and nanoscale surface topographies, physico-chemical characterization of material surface properties, investigation of protein adsorption dynamics, and evaluation of cellular responses in specific biomedical applications.
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Affiliation(s)
- Shelby A Skoog
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, United States; Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC, United States
| | - Girish Kumar
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, United States
| | - Roger J Narayan
- Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC, United States
| | - Peter L Goering
- Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, United States.
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23
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Wassel E, Es-Souni M, Berger N, Schopf D, Dietze M, Solterbeck CH, Es-Souni M. Nanocomposite Films of Laponite/PEG-Grafted Polymers and Polymer Brushes with Nonfouling Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6739-6750. [PMID: 28605897 DOI: 10.1021/acs.langmuir.7b00534] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We explore the suitability of nanocomposite thin films based on laponite nanomaterial and grafted antiadhesive polymers as transparent nonfouling surfaces. For this purpose, two polymers were chosen: a linear poly(ethylene glycol) (PEG) silane, 2-[methoxy(polyethyleneoxy)propyl]-trimethoxysilane), and thermoresponsive poly(oligo ethylene glycol)-methyl ether-methacrylate (POEGMA) brushes. PEG silane was grafted on the laponite nanoparticles in solution yielding homogeneous and transparent thin films via a dip coating procedure on glass and silicon substrates. POEGMA was grafted on laponite-(3-Aminopropyl)trimethoxysilane (APTMS) nanocomposite films that were processed similarly to PEG-silane using atom transfer radical polymerization (ATRP). Film characterization with, among others, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM) attests to successful grafting of the polymers to the laponite nanoparticles. In particular, evidence of basal plane expansion of laponite with increasing silane concentration are obtained using XRD, while patent morphological changes are revealed with AFM. The results are discussed in terms of the different grafting sites on laponite and compared with literature. While LP-PEG-silane is easily applied to a surface from a precursor solution via a dip coating procedure LP-APTMS-OEGMA requires lots more chemicals, a thorough control of reaction parameters, and longer reaction time in order to generate films with the desirable properties. We therefore also addressed the antifouling properties of the films. These were tested together with control samples of bare glass and laponite thin films for 30 days in an algae container. More tests were conducted with fibroblast cell cultures. Our preliminary results show that grafting of PEG containing polymers and polymer brushes alters the properties of the laponite films from fouling to nonfouling surfaces. As a first estimate, the adhesion of particles (diatoms, algae, etc.) to surfaces is reduced by approximately 85% in the case of LP-PEG-silane and up to 92% in the case of LP-APTMS-POEGMA, in comparison to the control surfaces. Furthermore, practically no cell adhesion on such surfaces could be observed.
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Affiliation(s)
- Ekram Wassel
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Martha Es-Souni
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
- Cell Culture Laboratory, Clinic of Dentistry, University of Kiel , 24118 Kiel, Germany
| | - Nele Berger
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Dimitri Schopf
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Matthias Dietze
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Claus-Henning Solterbeck
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Mohammed Es-Souni
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
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24
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Mechanochemical feedback underlies coexistence of qualitatively distinct cell polarity patterns within diverse cell populations. Proc Natl Acad Sci U S A 2017; 114:E5750-E5759. [PMID: 28655842 DOI: 10.1073/pnas.1700054114] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Cell polarization and directional cell migration can display random, persistent, and oscillatory dynamic patterns. However, it is not clear whether these polarity patterns can be explained by the same underlying regulatory mechanism. Here, we show that random, persistent, and oscillatory migration accompanied by polarization can simultaneously occur in populations of melanoma cells derived from tumors with different degrees of aggressiveness. We demonstrate that all of these patterns and the probabilities of their occurrence are quantitatively accounted for by a simple mechanism involving a spatially distributed, mechanochemical feedback coupling the dynamically changing extracellular matrix (ECM)-cell contacts to the activation of signaling downstream of the Rho-family small GTPases. This mechanism is supported by a predictive mathematical model and extensive experimental validation, and can explain previously reported results for diverse cell types. In melanoma, this mechanism also accounts for the effects of genetic and environmental perturbations, including mutations linked to invasive cell spread. The resulting mechanistic understanding of cell polarity quantitatively captures the relationship between population variability and phenotypic plasticity, with the potential to account for a wide variety of cell migration states in diverse pathological and physiological conditions.
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25
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Yamada Y, Ito K, Miura A, Iizuka H, Wakayama H. Simple and scalable preparation of master mold for nanoimprint lithography. NANOTECHNOLOGY 2017; 28:205303. [PMID: 28445164 DOI: 10.1088/1361-6528/aa6a9f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nanoimprint lithography (NIL) is one of the most prominent bottom-up techniques for duplicating nanostructures with a high throughput. However, fabrication of starting master mold commonly requires expensive equipment of top-down techniques, or additional steps to transfer the fabricated patterns from bottom-up methods. Here we demonstrate that a SiO2 nanostructure manufactured from a self-assembled block copolymer, polystyrene-b-polydimethylsiloxane (PS-b-PDMS), directly serves as a master mold for NIL without further modification. A hexagonally aligned pattern over the entire substrate is established using a simple technique; solvent annealing and etching. Etching also plays an important role in endowing fluorine on the surface of SiO2, thus promoting smooth demolding upon imprinting. The obtained pattern of the SiO2 nanostructure is transferred to a polymer surface using UV nanoimprint. Identical patterns of the SiO2 nanostructure are elaborately reproduced on Ni and Cu nanodot arrays via electroplating on the polymer transcript, which was verified by morphological observations. The uniformity of the replicated Ni nanodot array is evaluated using spectroscopic ellipsometry. The measured optical response of the Ni nanodot is validated by electromagnetically simulated results, indicating that the pattern transfer is not limited to a small local area. In addition, the durability of the SiO2 mold pattern is corroborated after the imprinting process, thus guaranteeing the reusability of the fabricated nanostructure as a master mold. The proposed approach does not require any high-end lithographic techniques; this may result in significant cost and time reductions in future nanofabrication.
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Affiliation(s)
- Yuri Yamada
- Toyota Central Research & Development Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan
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26
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Wassel E, Wesner D, Schönherr H. Colloidal force probe study of poly(di(ethylene glycol)methylether methacrylate) homopolymer brush layers in aqueous media at different temperatures. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.02.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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27
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Kim HN, Jang KJ, Shin JY, Kang D, Kim SM, Koh I, Hong Y, Jang S, Kim MS, Kim BS, Jeong HE, Jeon NL, Kim P, Suh KY. Artificial Slanted Nanocilia Array as a Mechanotransducer for Controlling Cell Polarity. ACS NANO 2017; 11:730-741. [PMID: 28051852 DOI: 10.1021/acsnano.6b07134] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present a method to induce cell directional behavior using slanted nanocilia arrays. NIH-3T3 fibroblasts demonstrated bidirectional polarization in a rectangular arrangement on vertical nanocilia arrays and exhibited a transition from a bidirectional to a unidirectional polarization pattern when the angle of the nanocilia was decreased from 90° to 30°. The slanted nanocilia guided and facilitated spreading by allowing the cells to contact the sidewalls of the nanocilia, and the directional migration of the cells opposed the direction of the slant due to the anisotropic bending stiffness of the slanted nanocilia. Although the cells recognized the underlying anisotropic geometry when the nanocilia were coated with fibronectin, collagen type I, and Matrigel, the cells lost their directionality when the nanocilia were coated with poly-d-lysine and poly-l-lysine. Furthermore, although the cells recognized geometrical anisotropy on fibronectin coatings, pharmacological perturbation of PI3K-Rac signaling hindered the directional elongation of the cells on both the slanted and vertical nanocilia. Furthermore, myosin light chain II was required for the cells to obtain polarized morphologies. These results indicated that the slanted nanocilia array provided anisotropic contact guidance cues to the interacting cells. The polarization of cells was controlled through two steps: the recognition of underlying geometrical anisotropy and the subsequent directional spreading according to the guidance cues.
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Affiliation(s)
- Hong Nam Kim
- Center for BioMicrosystems, Brain Science Institute, Korea Institute of Science and Technology (KIST) , Seoul 136-791, Republic of Korea
| | - Kyung-Jin Jang
- Emulate Inc. , Boston, Massachusetts 02210, United States
| | - Jung-Youn Shin
- School of Chemical and Biological Engineering, Seoul National University , Seoul 151-742, Republic of Korea
| | - Daeshik Kang
- Department of Mechanical Engineering, Ajou University , Suwon 443-749, Republic of Korea
| | - Sang Moon Kim
- Department of Mechanical Engineering, Incheon National University , Incheon 406-772, Republic of Korea
| | - Ilkyoo Koh
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701, Republic of Korea
| | - Yoonmi Hong
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701, Republic of Korea
| | - Segeun Jang
- School of Mechanical and Aerospace Engineering, Seoul National University , Seoul 151-742, Republic of Korea
| | - Min Sung Kim
- School of Mechanical and Aerospace Engineering, Seoul National University , Seoul 151-742, Republic of Korea
| | - Byung-Soo Kim
- School of Chemical and Biological Engineering, Seoul National University , Seoul 151-742, Republic of Korea
| | - Hoon Eui Jeong
- Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Republic of Korea
| | - Noo Li Jeon
- School of Mechanical and Aerospace Engineering, Seoul National University , Seoul 151-742, Republic of Korea
| | - Pilnam Kim
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701, Republic of Korea
| | - Kahp-Yang Suh
- School of Mechanical and Aerospace Engineering, Seoul National University , Seoul 151-742, Republic of Korea
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28
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Trease C, Longman M, Augousti A, Foot P, Pierscionek B. Cell morphology and growth observation studies on novel, chemically unmodified and patterned polymer surfaces for advanced tissue culture applications. POLYMER 2017. [DOI: 10.1016/j.polymer.2016.12.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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29
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Greiner AM, Sales A, Chen H, Biela SA, Kaufmann D, Kemkemer R. Nano- and microstructured materials for in vitro studies of the physiology of vascular cells. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:1620-1641. [PMID: 28144512 PMCID: PMC5238670 DOI: 10.3762/bjnano.7.155] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 10/04/2016] [Indexed: 05/21/2023]
Abstract
The extracellular environment of vascular cells in vivo is complex in its chemical composition, physical properties, and architecture. Consequently, it has been a great challenge to study vascular cell responses in vitro, either to understand their interaction with their native environment or to investigate their interaction with artificial structures such as implant surfaces. New procedures and techniques from materials science to fabricate bio-scaffolds and surfaces have enabled novel studies of vascular cell responses under well-defined, controllable culture conditions. These advancements are paving the way for a deeper understanding of vascular cell biology and materials-cell interaction. Here, we review previous work focusing on the interaction of vascular smooth muscle cells (SMCs) and endothelial cells (ECs) with materials having micro- and nanostructured surfaces. We summarize fabrication techniques for surface topographies, materials, geometries, biochemical functionalization, and mechanical properties of such materials. Furthermore, various studies on vascular cell behavior and their biological responses to micro- and nanostructured surfaces are reviewed. Emphasis is given to studies of cell morphology and motility, cell proliferation, the cytoskeleton and cell-matrix adhesions, and signal transduction pathways of vascular cells. We finalize with a short outlook on potential interesting future studies.
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Affiliation(s)
- Alexandra M Greiner
- Karlsruhe Institute of Technology (KIT), Institute of Zoology, Department of Cell and Neurobiology, Haid-und-Neu-Strasse 9, 76131 Karlsruhe, Germany
- now at: Pforzheim University, School of Engineering, Tiefenbronner Strasse 65, 75175 Pforzheim, Germany
| | - Adria Sales
- Max Planck Institute for Intelligent Systems, Department of New Materials and Biosystems, Heisenbergstrasse 3, 70569 Stuttgart, Germany
| | - Hao Chen
- Karlsruhe Institute of Technology (KIT), Institute of Zoology, Department of Cell and Neurobiology, Haid-und-Neu-Strasse 9, 76131 Karlsruhe, Germany
| | - Sarah A Biela
- Max Planck Institute for Intelligent Systems, Department of New Materials and Biosystems, Heisenbergstrasse 3, 70569 Stuttgart, Germany
| | - Dieter Kaufmann
- Universitätsklinikum Ulm, Institut für Humangenetik, Albert Einstein Allee 11, 89070 Ulm, Germany
| | - Ralf Kemkemer
- Max Planck Institute for Intelligent Systems, Department of New Materials and Biosystems, Heisenbergstrasse 3, 70569 Stuttgart, Germany
- Reutlingen University, Faculty of Applied Chemistry, Alteburgstrasse 150, 72762 Reutlingen, Germany
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30
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Voß Y, Wassel E, Jiang S, Song Q, Druzhinin SI, Schönherr H. Thin Poly(Di(Ethylene Glycol)Methyl Ether Methacrylate) Homopolymer Brushes Allow Controlled Adsorption and Desorption of PaTu 8988t Cells. Macromol Biosci 2016; 17. [DOI: 10.1002/mabi.201600337] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 09/23/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Yvonne Voß
- University of Siegen; Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ); Physical Chemistry I; Adolf-Reichwein-Str. 2 57076 Siegen Germany
| | - Ekram Wassel
- University of Siegen; Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ); Physical Chemistry I; Adolf-Reichwein-Str. 2 57076 Siegen Germany
| | - Siyu Jiang
- University of Siegen; Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ); Physical Chemistry I; Adolf-Reichwein-Str. 2 57076 Siegen Germany
| | - Qimeng Song
- University of Siegen; Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ); Physical Chemistry I; Adolf-Reichwein-Str. 2 57076 Siegen Germany
| | - Sergey I. Druzhinin
- University of Siegen; Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ); Physical Chemistry I; Adolf-Reichwein-Str. 2 57076 Siegen Germany
| | - Holger Schönherr
- University of Siegen; Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ); Physical Chemistry I; Adolf-Reichwein-Str. 2 57076 Siegen Germany
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31
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Nguyen DHK, Pham VTH, Al Kobaisi M, Bhadra C, Orlowska A, Ghanaati S, Manzi BM, Baulin VA, Joudkazis S, Kingshott P, Crawford RJ, Ivanova EP. Adsorption of Human Plasma Albumin and Fibronectin onto Nanostructured Black Silicon Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10744-10751. [PMID: 27718587 DOI: 10.1021/acs.langmuir.6b02601] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The protein adsorption of two human plasma proteins-albumin (Alb) and fibronectin (Fn)-onto synthetic nanostructured bactericidal material-black silicon (bSi) surfaces (that contain an array of nanopillars) and silicon wafer (nonstructured) surfaces-was investigated. The adsorption behavior of Alb and Fn onto two types of substrata was studied using a combination of complementary analytical techniques. A two-step Alb adsorption mechanism onto the bSi surface has been proposed. At low bulk concentrations (below 40 μg/mL), the Alb preferentially adsorbed at the base of the nanopillars. At higher bulk concentrations, the Alb adsorbed on the top of the nanopillars. In the case of Fn, the protein preferentially adsorbed on the top of the nanopillars, irrespective of its bulk concentration.
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Affiliation(s)
- Duy H K Nguyen
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
| | - Vy T H Pham
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
| | - Mohammad Al Kobaisi
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
| | - Chris Bhadra
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
| | - Anna Orlowska
- Frankfurt Orofacial Regenerative Medicine, University Hospital Frankfurt , Theodor-Stern-Kai 7, D-60590 Frankfurt am Main, Germany
| | - Shahram Ghanaati
- Frankfurt Orofacial Regenerative Medicine, University Hospital Frankfurt , Theodor-Stern-Kai 7, D-60590 Frankfurt am Main, Germany
| | - Berardo Mario Manzi
- Department d'Enginyeria Quimica, Universitat Rovira i Virgili , 26 Av. dels Paisos Catalans, 43007 Tarragona, Spain
| | - Vladimir A Baulin
- Department d'Enginyeria Quimica, Universitat Rovira i Virgili , 26 Av. dels Paisos Catalans, 43007 Tarragona, Spain
| | - Saulius Joudkazis
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
| | - Peter Kingshott
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
| | - Russell J Crawford
- School of Science, College of Science, Engineering and Health, RMIT University , Melbourne VIC 3001, Australia
| | - Elena P Ivanova
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn VIC 3122, Australia
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32
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Nam KH, Kim P, Wood DK, Kwon S, Provenzano PP, Kim DH. Multiscale Cues Drive Collective Cell Migration. Sci Rep 2016; 6:29749. [PMID: 27460294 PMCID: PMC4962098 DOI: 10.1038/srep29749] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 06/23/2016] [Indexed: 02/07/2023] Open
Abstract
To investigate complex biophysical relationships driving directed cell migration, we developed a biomimetic platform that allows perturbation of microscale geometric constraints with concomitant nanoscale contact guidance architectures. This permits us to elucidate the influence, and parse out the relative contribution, of multiscale features, and define how these physical inputs are jointly processed with oncogenic signaling. We demonstrate that collective cell migration is profoundly enhanced by the addition of contract guidance cues when not otherwise constrained. However, while nanoscale cues promoted migration in all cases, microscale directed migration cues are dominant as the geometric constraint narrows, a behavior that is well explained by stochastic diffusion anisotropy modeling. Further, oncogene activation (i.e. mutant PIK3CA) resulted in profoundly increased migration where extracellular multiscale directed migration cues and intrinsic signaling synergistically conspire to greatly outperform normal cells or any extracellular guidance cues in isolation.
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Affiliation(s)
- Ki-Hwan Nam
- Department of Bioengineering, Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98195, USA
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 151-742, Korea
- Division of Scientific Instrumentation, Optical Instrumentation Development Team, The Korea Basic Science Institute, Daejeon 34133, Korea
| | - Peter Kim
- Department of Bioengineering, Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98195, USA
| | - David K. Wood
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Sunghoon Kwon
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 151-742, Korea
- Institutes of Entrepreneurial BioConvergence, Seoul National University, Seoul 151-744, South Korea
- Seoul National University Hospital Biomedical Research Institute, Seoul National University hospital, Seoul 110-744, South Korea
| | - Paolo P. Provenzano
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
- Masonic Cancer Center, and Stem Cell Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Deok-Ho Kim
- Department of Bioengineering, Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98195, USA
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33
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Park J, Kim DH, Kim HN, Wang CJ, Kwak MK, Hur E, Suh KY, An SS, Levchenko A. Directed migration of cancer cells guided by the graded texture of the underlying matrix. NATURE MATERIALS 2016; 15:792-801. [PMID: 26974411 PMCID: PMC5517090 DOI: 10.1038/nmat4586] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 01/27/2016] [Indexed: 05/03/2023]
Abstract
Living cells and the extracellular matrix (ECM) can exhibit complex interactions that define key developmental, physiological and pathological processes. Here, we report a new type of directed migration-which we term 'topotaxis'-guided by the gradient of the nanoscale topographic features in the cells' ECM environment. We show that the direction of topotaxis is reflective of the effective cell stiffness, and that it depends on the balance of the ECM-triggered signalling pathways PI(3)K-Akt and ROCK-MLCK. In melanoma cancer cells, this balance can be altered by different ECM inputs, pharmacological perturbations or genetic alterations, particularly a loss of PTEN in aggressive melanoma cells. We conclude that topotaxis is a product of the material properties of cells and the surrounding ECM, and propose that the invasive capacity of many cancers may depend broadly on topotactic responses, providing a potentially attractive mechanism for controlling invasive and metastatic behaviour.
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Affiliation(s)
- JinSeok Park
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, USA
- Yale Systems Biology Institute, Yale University, West Haven, CT 06516, USA
- Departments of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Deok-Ho Kim
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Hong-Nam Kim
- Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Chiaochun Joanne Wang
- Departments of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Moon Kyu Kwak
- Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Eunmi Hur
- Departments of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Kahp-Yang Suh
- Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Steven S. An
- Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
- Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
- Physical Sciences-Oncology Center, Johns Hopkins University, Baltimore, MD 21218, USA
- To whom correspondence should be addressed: Steven S. An, Ph D. (), Andre Levchenko, Ph.D. ()
| | - Andre Levchenko
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, USA
- Yale Systems Biology Institute, Yale University, West Haven, CT 06516, USA
- To whom correspondence should be addressed: Steven S. An, Ph D. (), Andre Levchenko, Ph.D. ()
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34
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Seras-Franzoso J, Tatkiewicz WI, Vazquez E, García-Fruitós E, Ratera I, Veciana J, Villaverde A. Integrating mechanical and biological control of cell proliferation through bioinspired multieffector materials. Nanomedicine (Lond) 2016; 10:873-91. [PMID: 25816885 DOI: 10.2217/nnm.15.5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
In nature, cells respond to complex mechanical and biological stimuli whose understanding is required for tissue construction in regenerative medicine. However, the full replication of such bimodal effector networks is far to be reached. Engineering substrate roughness and architecture allows regulating cell adhesion, positioning, proliferation, differentiation and survival, and the external supply of soluble protein factors (mainly growth factors and hormones) has been long applied to promote growth and differentiation. Further, bioinspired scaffolds are progressively engineered as reservoirs for the in situ sustained release of soluble protein factors from functional topographies. We review here how research progresses toward the design of integrative, holistic scaffold platforms based on the exploration of individual mechanical and biological effectors and their further combination.
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Affiliation(s)
- Joaquin Seras-Franzoso
- Departament de Genètica & de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
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35
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Kim DH, Khademhosseini A, Lee LP. A Tribute to Professor Kahp-Yang Suh (1972-2013). Adv Healthc Mater 2016; 5:8-9. [PMID: 26749420 DOI: 10.1002/adhm.201500917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Deok-Ho Kim
- Department of Bioengineering, University of Washington; Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine; University of Washington; Seattle, WA 98109, USA; Center for Cardiovascular Biology; University of Washington; Seattle WA 98109 USA
| | - Ali Khademhosseini
- Center for Biomedical Engineering; Department of Medicine, Brigham and Women's Hospital; Harvard Medical School; Cambridge, MA 02139, USA; Harvard-MIT Division of Health, Sciences and Technology; Massachusetts Institute of Technology; Cambridge, MA 02139, USA; Wyss Institute for Biologically; Inspired Engineering at Harvard University; Boston MA 02115 USA
| | - Luke P. Lee
- Departments of Bioengineering; Electrical Engineering and Computer Science and Biophysics Graduate Program; University of California Berkeley; Berkeley CA 94720 USA
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36
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Manna A, Pramanik S, Tripathy A, Moradi A, Radzi Z, Pingguan-Murphy B, Hasnan N, Abu Osman NA. Development of biocompatible hydroxyapatite–poly(ethylene glycol) core–shell nanoparticles as an improved drug carrier: structural and electrical characterizations. RSC Adv 2016. [DOI: 10.1039/c6ra21210g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A model of a controlled drug release mechanism of a dielectric core–shell composite carrier.
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Affiliation(s)
- Ayan Manna
- Centre for Applied Biomechanics
- Department of Biomedical Engineering
- Faculty of Engineering
- University of Malaya
- Kuala Lumpur – 50603
| | - Sumit Pramanik
- Centre for Applied Biomechanics
- Department of Biomedical Engineering
- Faculty of Engineering
- University of Malaya
- Kuala Lumpur – 50603
| | - Ashis Tripathy
- Centre for Applied Biomechanics
- Department of Biomedical Engineering
- Faculty of Engineering
- University of Malaya
- Kuala Lumpur – 50603
| | - Ali Moradi
- Centre for Applied Biomechanics
- Department of Biomedical Engineering
- Faculty of Engineering
- University of Malaya
- Kuala Lumpur – 50603
| | - Zamri Radzi
- Department of Paediatric Dentistry & Orthodontics
- Faculty of Dentistry
- University of Malaya
- Kuala Lumpur – 50603
- Malaysia
| | - Belinda Pingguan-Murphy
- Centre for Applied Biomechanics
- Department of Biomedical Engineering
- Faculty of Engineering
- University of Malaya
- Kuala Lumpur – 50603
| | - Nazirah Hasnan
- Department of Rehabilitation Medicine
- Faculty of Medicine
- University of Malaya
- Kuala Lumpur – 50603
- Malaysia
| | - Noor Azuan Abu Osman
- Centre for Applied Biomechanics
- Department of Biomedical Engineering
- Faculty of Engineering
- University of Malaya
- Kuala Lumpur – 50603
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37
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Guterman R, Gillies ER, Ragogna PJ. Kinetically controlled patterning of highly cross-linked phosphonium photopolymers using simple anion exchange. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:5181-5189. [PMID: 25896478 DOI: 10.1021/acs.langmuir.5b00235] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A phosphonium salt possessing three methacrylate groups has been incorporated into a photopolymeric system to generate highly cross-linked polyelectrolyte networks. Emergent chemical and physical properties in the polymers were observed and attributed to the tandem increase in cross-link density and ion-content upon incorporation of the self-cross-linking cation. Anion-exchange with bis(trifluoromethylsulfonyl)imide or dodecylbenzenesulfonate resulted in significant differences in wettability and ion-exchange behavior. The passivating effects of dodecylbenzenesulfonate were utilized to selectively pattern fluorescein dye into the polymer network, highlighting a new patterning procedure using ionic-bond forming reactions.
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Affiliation(s)
- Ryan Guterman
- Department of Chemistry and The Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Elizabeth R Gillies
- Department of Chemistry and The Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Paul J Ragogna
- Department of Chemistry and The Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
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38
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Wolfesberger C, Wollhofen R, Buchegger B, Jacak J, Klar TA. Streptavidin functionalized polymer nanodots fabricated by visible light lithography. J Nanobiotechnology 2015; 13:27. [PMID: 25888763 PMCID: PMC4453224 DOI: 10.1186/s12951-015-0084-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Accepted: 03/05/2015] [Indexed: 11/25/2022] Open
Abstract
Background Two-photon polymerization, optionally combined with stimulated emission depletion (STED) lithography, allows two and three dimensional polymer fabrication with structure sizes and resolution below the diffraction limit. Structuring of polymers with photons, whose wavelength is within the visible range of the electromagnetic spectrum, gives new opportunities to a large field of applications e.g. in the field of biotechnology and tissue engineering. In order to create new biotechnological applications, versatile methods are needed to functionalize the polymeric structures. Results Here we report the creation of polymer-nanodots with high streptavidin (SA) affinity via two-photon polymerization (TPP). Controlling the size of the polymer dots allows for limiting the number of the SA molecules. TPP dots with a diameter of a few 100 nm show up to 100% streptavidin loading. We can show that most of the dots are loaded by one to two streptavidins on average. Attached streptavidin molecules remain functional and are capable to bind 0.7 biotin molecules on average. Conclusion The presented functionalized nanostructures may be used as platforms for a multitude of biological experimental setups. Nanoscopic well defined structures, capable of selective binding of streptavin proteins, used as linkers for other biotinylated biomolecules, may also find application in in-vitro sensing, like for example lab on chip devices with limited surface area.
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Affiliation(s)
- Clemens Wolfesberger
- Institute of Applied Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040, Linz, Austria. .,Department of Medical Engineering, Upper Austria University of Applied Sciences, Campus Linz, Garnisonstr. 21, 4020, Linz, Austria.
| | - Richard Wollhofen
- Institute of Applied Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040, Linz, Austria.
| | - Bianca Buchegger
- Institute of Applied Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040, Linz, Austria.
| | - Jaroslaw Jacak
- Institute of Applied Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040, Linz, Austria. .,Department of Medical Engineering, Upper Austria University of Applied Sciences, Campus Linz, Garnisonstr. 21, 4020, Linz, Austria.
| | - Thomas A Klar
- Institute of Applied Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040, Linz, Austria.
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39
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Dirany M, Dies L, Restagno F, Léger L, Poulard C, Miquelard-Garnier G. Chemical modification of PDMS surface without impacting the viscoelasticity: Model systems for a better understanding of elastomer/elastomer adhesion and friction. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.036] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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40
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Poly(ethylene glycol) (PEG) microwells in microfluidics: Fabrication methods and applications. BIOCHIP JOURNAL 2014. [DOI: 10.1007/s13206-014-8401-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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41
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Ito A, Fang Z, Brennaman MK, Meyer TJ. Long-range photoinduced electron transfer dynamics in rigid media. Phys Chem Chem Phys 2014; 16:4880-91. [PMID: 24473124 DOI: 10.1039/c3cp54801e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In semi-rigid PEG-DMA550 films with added reductive quenchers, electron transfer quenching of the metal-to-ligand charge transfer excited state(s) of [Ru(bpy)3](2+) (bpy = 2,2'-bipyridine) occurs by both rapid, fixed-site, and slow, diffusional, quenching processes. Stern-Volmer analysis of diffusional quenching reveals diffusion-controlled quenching both in the fluid and film with the latter greatly inhibited by the high viscosity of the medium. The data for fixed-site quenching are consistent with electron tunneling with the expected exponential distance dependence. Based on this analysis long-range electron transfer occurs with a distance attenuation factor β of ∼0.47 Å(-1) with a notable decrease, β = 0.16 Å(-1), when the quencher is incorporated into the PEG backbone. Fixed-site electron transfer quenching varies with driving force. Back electron transfer is complex, as expected for a distribution of fixed sites, and varies with power law kinetics.
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Affiliation(s)
- Akitaka Ito
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
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42
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Pinney JR, Melkus G, Cerchiari A, Hawkins J, Desai TA. Novel functionalization of discrete polymeric biomaterial microstructures for applications in imaging and three-dimensional manipulation. ACS APPLIED MATERIALS & INTERFACES 2014; 6:14477-14485. [PMID: 25068888 PMCID: PMC4149329 DOI: 10.1021/am503778t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 07/14/2014] [Indexed: 05/30/2023]
Abstract
Adapting ways to functionalize polymer materials is becoming increasingly important to their implementation in translational biomedical sciences. By tuning the mechanical, chemical, and biological qualities of these materials, their applications can be broadened, opening the door for more advanced integration into modern medical techniques. Here, we report on a method to integrate chemical functionalizations into discrete, microscale polymer structures, which are used for tissue engineering applications, for in vivo localization, and three-dimensional manipulation. Iron oxide nanoparticles were incorporated into the polymer matrix using common photolithographic techniques to create stably functional microstructures with magnetic potential. Using magnetic resonance imaging (MRI), we can promote visualization of microstructures contained in small collections, as well as facilitate the manipulation and alignment of microtopographical cues in a realistic tissue environment. Using similar polymer functionalization techniques, fluorine-containing compounds were also embedded in the polymer matrix of photolithographically fabricated microstructures. The incorporation of fluorine-containing compounds enabled highly sensitive and specific detection of microstructures in physiologic settings using fluorine MRI techniques ((19)F MRI). These functionalization strategies will facilitate more reliable noninvasive tracking and characterization of microstructured polymer implants as well as have implications for remote microstructural scaffolding alignment for three-dimensional tissue engineering applications.
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Affiliation(s)
- James R. Pinney
- Bioengineering and Therapeutic Sciences, University of California, San Francisco, 1700 Fourth Street, Byers Hall Room 203, San Francisco, California 94158, United States
- UC Berkeley-UCSF Graduate Program in Bioengineering, 1700 Fourth Street, Byers Hall
Room 216, San Francisco, California 94158, United States
| | - Gerd Melkus
- Department
of Radiology, UCSF Imaging Center at China Basin, University of California, San Francisco, 185 Berry Street, Suite 190, Lobby 6, San Francisco, California 94107, United States
- Department
of Medical Imaging, Ottawa Hospital, 1053 Carling Avenue, Ottawa K1Y 4E9, Ontario, Canada
| | - Alec Cerchiari
- Bioengineering and Therapeutic Sciences, University of California, San Francisco, 1700 Fourth Street, Byers Hall Room 203, San Francisco, California 94158, United States
- UC Berkeley-UCSF Graduate Program in Bioengineering, 1700 Fourth Street, Byers Hall
Room 216, San Francisco, California 94158, United States
| | - James Hawkins
- Department
of Radiology, UCSF Imaging Center at China Basin, University of California, San Francisco, 185 Berry Street, Suite 190, Lobby 6, San Francisco, California 94107, United States
| | - Tejal A. Desai
- Bioengineering and Therapeutic Sciences, University of California, San Francisco, 1700 Fourth Street, Byers Hall Room 203, San Francisco, California 94158, United States
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Hütten M, Dhanasingh A, Hessler R, Stöver T, Esser KH, Möller M, Lenarz T, Jolly C, Groll J, Scheper V. In vitro and in vivo evaluation of a hydrogel reservoir as a continuous drug delivery system for inner ear treatment. PLoS One 2014; 9:e104564. [PMID: 25105670 PMCID: PMC4126769 DOI: 10.1371/journal.pone.0104564] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Accepted: 07/10/2014] [Indexed: 12/20/2022] Open
Abstract
Fibrous tissue growth and loss of residual hearing after cochlear implantation can be reduced by application of the glucocorticoid dexamethasone-21-phosphate-disodium-salt (DEX). To date, sustained delivery of this agent to the cochlea using a number of pharmaceutical technologies has not been entirely successful. In this study we examine a novel way of continuous local drug application into the inner ear using a refillable hydrogel functionalized silicone reservoir. A PEG-based hydrogel made of reactive NCO-sP(EO-stat-PO) prepolymers was evaluated as a drug conveying and delivery system in vitro and in vivo. Encapsulating the free form hydrogel into a silicone tube with a small opening for the drug diffusion resulted in delayed drug release but unaffected diffusion of DEX through the gel compared to the free form hydrogel. Additionally, controlled DEX release over several weeks could be demonstrated using the hydrogel filled reservoir. Using a guinea-pig cochlear trauma model the reservoir delivery of DEX significantly protected residual hearing and reduced fibrosis. As well as being used as a device in its own right or in combination with cochlear implants, the hydrogel-filled reservoir represents a new drug delivery system that feasibly could be replenished with therapeutic agents to provide sustained treatment of the inner ear.
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Affiliation(s)
- Mareike Hütten
- Department of Otolaryngology, Hannover School of Medicine, Hannover, Germany
- University of Veterinary Medicine Hannover, Foundation, Institute of Zoology, Hannover, Germany
| | - Anandhan Dhanasingh
- MED-EL Innsbruck, Research & Development, Innsbruck, Österreich
- Interactive Materials Research–DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany
| | - Roland Hessler
- MED-EL Innsbruck, Research & Development, Innsbruck, Österreich
| | - Timo Stöver
- J.W. Goethe University Hospital and Faculty of Medicine, Department of Otolaryngology, Frankfurt am Main, Germany
| | - Karl-Heinz Esser
- University of Veterinary Medicine Hannover, Foundation, Institute of Zoology, Hannover, Germany
| | - Martin Möller
- Interactive Materials Research–DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany
| | - Thomas Lenarz
- Department of Otolaryngology, Hannover School of Medicine, Hannover, Germany
| | - Claude Jolly
- MED-EL Innsbruck, Research & Development, Innsbruck, Österreich
| | - Jürgen Groll
- Interactive Materials Research–DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany
- University of Würzburg, Department of Functional Materials in Medicine and Dentistry, Würzburg, Germany
- * E-mail: (JG); (VS)
| | - Verena Scheper
- Department of Otolaryngology, Hannover School of Medicine, Hannover, Germany
- Institute of Audioneurotechnology, Hannover School of Medicine, Hannover, Germany
- * E-mail: (JG); (VS)
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Kim P, Jeon NL, Khademhosseini A. Introduction: themed issue dedicated to Professor Kahp-Yang Suh. LAB ON A CHIP 2014; 14:2143-2144. [PMID: 24861701 DOI: 10.1039/c4lc90048k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Affiliation(s)
- Pilnam Kim
- Department of Bio and Brain Engineering, KAIST, Daejeon 305-701, Republic of Korea
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Kobayashi M, Koide T, Hyon SH. Tribological characteristics of polyethylene glycol (PEG) as a lubricant for wear resistance of ultra-high-molecular-weight polyethylene (UHMWPE ) in artificial knee join. J Mech Behav Biomed Mater 2014; 38:33-8. [PMID: 25016174 DOI: 10.1016/j.jmbbm.2014.06.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Revised: 05/30/2014] [Accepted: 06/05/2014] [Indexed: 11/25/2022]
Abstract
For the longevity of total knee joint prostheses, we have developed an artificial lubricant using polyethylene glycol (PEG) for the prevention of wear of ultra-high-molecular-weight polyethylene (UHMWPE). In the present study, the lubricative function of this PEG lubricant was evaluated by a wear test using Co-Cr alloy and UHMWPE counter surface samples. As a result, human synovial fluid including the PEG lubricant showed good result regarding the wear volume and a worn surface of UHMWPE. Considering its lubrication mechanism, it is suspected that interaction between the PEG molecules and the proteins in synovial fluid was involved. Since PE molecules are also organic compounds having a hydroxyl group at one or both ends, the albumin and PEG molecule complex would have bound more strongly to the metal oxide surface and UHMWPE surfaces might enhance and stabilize the lubricating film between the contact surfaces under the boundary lubrication. This study suggests that PEG lubricant as an intra-articular viscous supplement has the potential to prevent wear of UHMWPE by mixing with synovial fluid and to contribute to the longevity of knee joint prostheses.
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Affiliation(s)
- Masanori Kobayashi
- Bio-medical Engineering Laboratory, Department of Integral Mechanical Engineering, Faculty of Engineering, Daido University, 10-3 Takiharu-cho, Minami-ku, Nagoya, Japan.
| | - Takayuki Koide
- Bio-medical Engineering Laboratory, Department of Integral Mechanical Engineering, Faculty of Engineering, Daido University, 10-3 Takiharu-cho, Minami-ku, Nagoya, Japan
| | - Suong-Hyu Hyon
- Institute for Frontier Medical Sciences, Kyoto University, 353 Shogoin, Sakyo-ku, Kyoto, Japan
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Macadangdang J, Lee HJ, Carson D, Jiao A, Fugate J, Pabon L, Regnier M, Murry C, Kim DH. Capillary force lithography for cardiac tissue engineering. J Vis Exp 2014. [PMID: 24962161 DOI: 10.3791/50039] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Cardiovascular disease remains the leading cause of death worldwide(1). Cardiac tissue engineering holds much promise to deliver groundbreaking medical discoveries with the aims of developing functional tissues for cardiac regeneration as well as in vitro screening assays. However, the ability to create high-fidelity models of heart tissue has proven difficult. The heart's extracellular matrix (ECM) is a complex structure consisting of both biochemical and biomechanical signals ranging from the micro- to the nanometer scale(2). Local mechanical loading conditions and cell-ECM interactions have recently been recognized as vital components in cardiac tissue engineering(3-5). A large portion of the cardiac ECM is composed of aligned collagen fibers with nano-scale diameters that significantly influences tissue architecture and electromechanical coupling(2). Unfortunately, few methods have been able to mimic the organization of ECM fibers down to the nanometer scale. Recent advancements in nanofabrication techniques, however, have enabled the design and fabrication of scalable scaffolds that mimic the in vivo structural and substrate stiffness cues of the ECM in the heart(6-9). Here we present the development of two reproducible, cost-effective, and scalable nanopatterning processes for the functional alignment of cardiac cells using the biocompatible polymer poly(lactide-co-glycolide) (PLGA)(8) and a polyurethane (PU) based polymer. These anisotropically nanofabricated substrata (ANFS) mimic the underlying ECM of well-organized, aligned tissues and can be used to investigate the role of nanotopography on cell morphology and function(10-14). Using a nanopatterned (NP) silicon master as a template, a polyurethane acrylate (PUA) mold is fabricated. This PUA mold is then used to pattern the PU or PLGA hydrogel via UV-assisted or solvent-mediated capillary force lithography (CFL), respectively(15,16). Briefly, PU or PLGA pre-polymer is drop dispensed onto a glass coverslip and the PUA mold is placed on top. For UV-assisted CFL, the PU is then exposed to UV radiation (λ = 250-400 nm) for curing. For solvent-mediated CFL, the PLGA is embossed using heat (120 °C) and pressure (100 kPa). After curing, the PUA mold is peeled off, leaving behind an ANFS for cell culture. Primary cells, such as neonatal rat ventricular myocytes, as well as human pluripotent stem cell-derived cardiomyocytes, can be maintained on the ANFS(2).
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Affiliation(s)
| | - Hyun Jung Lee
- Department of Bioengineering, University of Washington
| | - Daniel Carson
- Department of Bioengineering, University of Washington
| | - Alex Jiao
- Department of Bioengineering, University of Washington
| | - James Fugate
- Department of Pathology, University of Washington
| | - Lil Pabon
- Department of Pathology, University of Washington
| | | | | | - Deok-Ho Kim
- Department of Bioengineering, University of Washington;
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Jiao A, Trosper NE, Yang HS, Kim J, Tsui JH, Frankel SD, Murry CE, Kim DH. Thermoresponsive nanofabricated substratum for the engineering of three-dimensional tissues with layer-by-layer architectural control. ACS NANO 2014; 8:4430-9. [PMID: 24628277 PMCID: PMC4046788 DOI: 10.1021/nn4063962] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 03/15/2014] [Indexed: 05/25/2023]
Abstract
Current tissue engineering methods lack the ability to properly recreate scaffold-free, cell-dense tissues with physiological structures. Recent studies have shown that the use of nanoscale cues allows for precise control over large-area 2D tissue structures without restricting cell growth or cell density. In this study, we developed a simple and versatile platform combining a thermoresponsive nanofabricated substratum (TNFS) incorporating nanotopographical cues and the gel casting method for the fabrication of scaffold-free 3D tissues. Our TNFS allows for the structural control of aligned cell monolayers which can be spontaneously detached via a change in culture temperature. Utilizing our gel casting method, viable, aligned cell sheets can be transferred without loss of anisotropy or stacked with control over individual layer orientations. Transferred cell sheets and individual cell layers within multilayered tissues robustly retain structural anisotropy, allowing for the fabrication of scaffold-free, 3D tissues with hierarchical control of overall tissue structure.
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Affiliation(s)
- Alex Jiao
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
| | - Nicole E. Trosper
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
| | - Hee Seok Yang
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 330-714, Republic of Korea
| | - Jinsung Kim
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
| | - Jonathan H. Tsui
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
| | - Samuel D. Frankel
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
| | - Charles E. Murry
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
- Department of Pathology, University of Washington, Seattle, Washington 98195, United States
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, Washington 98109, United States
- Center for Cardiovascular Biology, University of Washington, Seattle, Washington 98109, United States
- Department of Medicine/Cardiology, University of Washington, Seattle, Washington 98195, United States
| | - Deok-Ho Kim
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, Washington 98109, United States
- Center for Cardiovascular Biology, University of Washington, Seattle, Washington 98109, United States
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Lee CH, Cheng YW, Huang GS. Topographical control of cell-cell interaction in C6 glioma by nanodot arrays. NANOSCALE RESEARCH LETTERS 2014; 9:250. [PMID: 24917700 PMCID: PMC4032869 DOI: 10.1186/1556-276x-9-250] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 05/10/2014] [Indexed: 06/03/2023]
Abstract
Nanotopography modulates the physiological behavior of cells and cell-cell interactions, but the manner of communication remains unclear. Cell networking (syncytium) of astroglia provides the optimal microenvironment for communication of the nervous system. C6 glioma cells were seeded on nanodot arrays with dot diameters ranging from 10 to 200 nm. Cell viability, morphology, cytoskeleton, and adhesion showed optimal cell growth on 50-nm nanodots if sufficient incubation was allowed. In particular, the astrocytic syncytium level maximized at 50 nm. The gap junction protein Cx43 showed size-dependent and time-dependent transport from the nucleus to the cell membrane. The transport efficiency was greatly enhanced by incubation on 50-nm nanodots. In summary, nanotopography is capable of modulating cell behavior and influencing the cell-cell interactions of astrocytes. By fine-tuning the nanoenvironment, it may be possible to regulate cell-cell communications and optimize the biocompatibility of neural implants.
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Affiliation(s)
- Chia-Hui Lee
- Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
| | - Ya-Wen Cheng
- Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
| | - G Steven Huang
- Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
- Institute of Biomedical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
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Krishnamoorthy B, Karanam V, Chellan VR, Siram K, Natarajan TS, Gregory M. Polymersomes as an effective drug delivery system for glioma--a review. J Drug Target 2014; 22:469-77. [PMID: 24830300 DOI: 10.3109/1061186x.2014.916712] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Glioma is one of the most commonly occurring malignant brain tumours which need proper treatment strategy. The current therapies for treating glioma like surgical resection, radiotherapy, and chemotherapy have failed in achieving satisfactory results and this forms a rationale for the development of novel drug delivery systems. Among them, polymersomes are superior novel carriers with diverse functions like enhanced stability, low permeability, tunable membrane properties, surface functionality, and long blood circulation time which make them suitable for cancer therapy. These are bilayered vesicles capable of encapsulating both hydrophilic and hydrophobic drugs used to target glioma effectively. In this review, we have discussed on general preparation, characterization, and targeting aspects of surface modified polymersomes for effective delivery of therapeutic agents to glioma.
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Affiliation(s)
- Balakumar Krishnamoorthy
- Department of Pharmaceutics, PSG College of Pharmacy , Peelamedu, Coimbatore, Tamil Nadu , India and
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50
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Ito A, Knight TE, Stewart DJ, Brennaman MK, Meyer TJ. Rigid medium effects on photophysical properties of MLCT excited states of polypyridyl Os(II) complexes in polymerized poly(ethylene glycol)dimethacrylate monoliths. J Phys Chem A 2014; 118:10326-32. [PMID: 24720473 DOI: 10.1021/jp5019873] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Higher-energy emissions from the metal-to-ligand charge-transfer (MLCT) excited states of a series of polypyridyl Os(II) complexes were observed at the fluid-to-film transition in PEG-DMA550. The higher-energy excited states, caused by a "rigid medium effect" in the film, led to enhanced emission quantum yields and longer excited-state lifetimes. Detailed analyses of spectra and excited-state dynamics by Franck-Condon emission spectral analysis and application of the energy gap law for nonradiative excited-state decay reveal that the rigid medium effect arises from the inability of part of the local medium dielectric environment to respond to the change in charge distribution in the excited state during its lifetime. Enhanced excited-state lifetimes are consistent with qualitative and quantitative predictions of the energy gap law.
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Affiliation(s)
- Akitaka Ito
- Department of Chemistry, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
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