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Chau A, Edwards CER, Helgeson ME, Pitenis AA. Designing Superlubricious Hydrogels from Spontaneous Peroxidation Gradients. ACS APPLIED MATERIALS & INTERFACES 2023; 15:43075-43086. [PMID: 37650860 PMCID: PMC10510045 DOI: 10.1021/acsami.3c04636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 08/17/2023] [Indexed: 09/01/2023]
Abstract
Hydrogels are hydrated three-dimensional networks of hydrophilic polymers that are commonly used in the biomedical industry due to their mechanical and structural tunability, biocompatibility, and similar water content to biological tissues. The surface structure of hydrogels polymerized through free-radical polymerization can be modified by controlling environmental oxygen concentrations, leading to the formation of a polymer concentration gradient. In this work, 17.5 wt % polyacrylamide hydrogels are polymerized in low (0.01 mol % O2) and high (20 mol % O2) oxygen environments, and their mechanical and tribological properties are characterized through microindentation, nanoindentation, and tribological sliding experiments. Without significantly reducing the elastic modulus of the hydrogel (E* ≈ 200 kPa), we demonstrate an order of magnitude reduction in friction coefficient (from μ = 0.021 ± 0.006 to μ = 0.002 ± 0.001) by adjusting polymerization conditions (e.g., oxygen concentration). A quantitative analytical model based on polyacrylamide chemistry and kinetics was developed to estimate the thickness and structure of the monomer conversion gradient, termed the "surface gel layer". We find that polymerizing hydrogels at high oxygen concentrations leads to the formation of a preswollen surface gel layer that is approximately five times thicker (t ≈ 50 μm) and four times less concentrated (≈ 6% monomer conversion) at the surface prior to swelling compared to low oxygen environments (t ≈ 10 μm, ≈ 20% monomer conversion). Our model could be readily modified to predict the preswollen concentration profile of the polyacrylamide gel surface layer for any reaction conditions─monomer and initiator concentration, oxygen concentration, reaction time, and reaction media depth─or used to select conditions that correspond to a certain desired surface gel layer profile.
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Affiliation(s)
- Allison
L. Chau
- Materials
Department, University of California, Santa
Barbara, Santa
Barbara, California 93106, United States
- Materials
Research Laboratory, University of California,
Santa Barbara, Santa Barbara, California 93106, United States
| | - Chelsea E. R. Edwards
- Materials
Research Laboratory, University of California,
Santa Barbara, Santa Barbara, California 93106, United States
- Department
of Chemical Engineering, University of California,
Santa Barbara, Santa Barbara, California 93106, United States
| | - Matthew E. Helgeson
- Materials
Research Laboratory, University of California,
Santa Barbara, Santa Barbara, California 93106, United States
- Department
of Chemical Engineering, University of California,
Santa Barbara, Santa Barbara, California 93106, United States
| | - Angela A. Pitenis
- Materials
Department, University of California, Santa
Barbara, Santa
Barbara, California 93106, United States
- Materials
Research Laboratory, University of California,
Santa Barbara, Santa Barbara, California 93106, United States
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2
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Hu Y, Yang Y, Tian F, Xu P, Du R, Xia X, Xu S. Fabrication of Stiffness Gradient Nanocomposite Hydrogels for Mimicking Cell Microenvironment. Macromol Res 2021. [DOI: 10.1007/s13233-021-9056-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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3
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Narasimhan BN, Horrocks MS, Malmström J. Hydrogels with Tunable Physical Cues and Their Emerging Roles in Studies of Cellular Mechanotransduction. ADVANCED NANOBIOMED RESEARCH 2021. [DOI: 10.1002/anbr.202100059] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Badri Narayanan Narasimhan
- Department of Chemical and Materials Engineering University of Auckland Private Bag 92019 Auckland 1142 New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology Victoria University of Wellington PO Box 600 Wellington 6140 New Zealand
| | - Matthew S. Horrocks
- Department of Chemical and Materials Engineering University of Auckland Private Bag 92019 Auckland 1142 New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology Victoria University of Wellington PO Box 600 Wellington 6140 New Zealand
| | - Jenny Malmström
- Department of Chemical and Materials Engineering University of Auckland Private Bag 92019 Auckland 1142 New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology Victoria University of Wellington PO Box 600 Wellington 6140 New Zealand
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4
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Valuev IL, Vanchugova LV, Gorshkova MY, Sivov NA, Valuev LI. Structure of Hydrogels and Activity of Proteins Immobilized in Them. POLYMER SCIENCE SERIES B 2021. [DOI: 10.1134/s1560090421040114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Dey K, Roca E, Ramorino G, Sartore L. Progress in the mechanical modulation of cell functions in tissue engineering. Biomater Sci 2021; 8:7033-7081. [PMID: 33150878 DOI: 10.1039/d0bm01255f] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In mammals, mechanics at multiple stages-nucleus to cell to ECM-underlie multiple physiological and pathological functions from its development to reproduction to death. Under this inspiration, substantial research has established the role of multiple aspects of mechanics in regulating fundamental cellular processes, including spreading, migration, growth, proliferation, and differentiation. However, our understanding of how these mechanical mechanisms are orchestrated or tuned at different stages to maintain or restore the healthy environment at the tissue or organ level remains largely a mystery. Over the past few decades, research in the mechanical manipulation of the surrounding environment-known as substrate or matrix or scaffold on which, or within which, cells are seeded-has been exceptionally enriched in the field of tissue engineering and regenerative medicine. To do so, traditional tissue engineering aims at recapitulating key mechanical milestones of native ECM into a substrate for guiding the cell fate and functions towards specific tissue regeneration. Despite tremendous progress, a big puzzle that remains is how the cells compute a host of mechanical cues, such as stiffness (elasticity), viscoelasticity, plasticity, non-linear elasticity, anisotropy, mechanical forces, and mechanical memory, into many biological functions in a cooperative, controlled, and safe manner. High throughput understanding of key cellular decisions as well as associated mechanosensitive downstream signaling pathway(s) for executing these decisions in response to mechanical cues, solo or combined, is essential to address this issue. While many reports have been made towards the progress and understanding of mechanical cues-particularly, substrate bulk stiffness and viscoelasticity-in regulating the cellular responses, a complete picture of mechanical cues is lacking. This review highlights a comprehensive view on the mechanical cues that are linked to modulate many cellular functions and consequent tissue functionality. For a very basic understanding, a brief discussion of the key mechanical players of ECM and the principle of mechanotransduction process is outlined. In addition, this review gathers together the most important data on the stiffness of various cells and ECM components as well as various tissues/organs and proposes an associated link from the mechanical perspective that is not yet reported. Finally, beyond addressing the challenges involved in tuning the interplaying mechanical cues in an independent manner, emerging advances in designing biomaterials for tissue engineering are also explored.
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Affiliation(s)
- Kamol Dey
- Department of Applied Chemistry and Chemical Engineering, Faculty of Science, University of Chittagong, Bangladesh
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6
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Aufderhorst-Roberts A, Hughes MDG, Hare A, Head DA, Kapur N, Brockwell DJ, Dougan L. Reaction Rate Governs the Viscoelasticity and Nanostructure of Folded Protein Hydrogels. Biomacromolecules 2020; 21:4253-4260. [PMID: 32870660 DOI: 10.1021/acs.biomac.0c01044] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Hydrogels constructed from folded protein domains are of increasing interest as resilient and responsive biomaterials, but their optimization for applications requires time-consuming and costly molecular design. Here, we explore a complementary approach to control their properties by examining the influence of crosslinking rate on the structure and viscoelastic response of a model hydrogel constructed from photochemically crosslinked bovine serum albumin (BSA). Gelation is observed to follow a heterogeneous nucleation pathway in which BSA monomers crosslink into compact nuclei that grow into fractal percolated networks. Both the viscoelastic response probed by shear rheology and the nanostructure probed by small-angle X-ray scattering (SAXS) are shown to depend on the photochemical crosslinking reaction rate, with increased reaction rates corresponding to higher viscoelastic moduli, lower fractal dimension, and higher fractal cluster size. Reaction rate-dependent changes are shown to be consistent with a transition between diffusion- and rate-limited assembly, and the corresponding changes to viscoelastic response are proposed to arise from the presence of nonfractal depletion regions, as confirmed by SAXS. This controllable nanostructure and viscoelasticity constitute a potential route for the precise control of hydrogel properties, without the need for molecular modification.
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Affiliation(s)
| | - Matt D G Hughes
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
| | - Andrew Hare
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
| | - David A Head
- School of Computing, University of Leeds, Leeds LS2 9JT, U.K
| | - Nikil Kapur
- School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, U.K
| | - David J Brockwell
- School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, U.K
| | - Lorna Dougan
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
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7
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Wei G, Yan Z, Tian J, Zhao G, Guang S, Xu H. Efficient Polymer Pendant Approach toward High Stable Organic Fluorophore for Sensing Ultratrace Hg 2+ with Improved Biological Compatibility and Cell Permeability. Anal Chem 2020; 92:3293-3301. [PMID: 31973517 DOI: 10.1021/acs.analchem.9b05174] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A convenient and efficient method to eliminate the aggregation effect of organic photoelectric sensing materials and to improve biological compatibility and cell permeability as well was developed by hanging organic fluorophores on a polymer chain, for example, fluorescein fluorophores had been controllably hung on polyacrylamide main chains with a 1:2 stoichiometric ratio by a simple copolymerization strategy. The results showed that introduction of water-soluble bioactive polyacrylamide main chains into fluorescein fluorophores via covalent bonds could effectively improve their optical stability by deteriorating π-π stack and charge-transfer interactions among different fluorophores. More importantly, the resultant materials possessed low toxicity and excellent cell permeability ten times larger than their precursor fluorescein fluorophore, which made it express an especially turn-on fluorescent response to ultratrace Hg2+ both in aqueous and living cells by forming stable 5-member-ring complexes with Hg2+ with a correlation coefficient of 0.997 and a low detection limit of 4.0 × 10-10 mol·L-1. This work provides promising insight into constructing some practical sensing materials for environmentally-friendly biological analyses.
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Affiliation(s)
- Gang Wei
- State Key Laboratory for Modification of Chemical Fibers, College of Chemistry, Chemical Engineering and Biotechnology , Donghua University , Shanghai 201620 , China
| | - Zhengquan Yan
- School of Chemistry and Chemical Engineering , Qufu Normal University , Qufu 273165 , China
| | - Jiachan Tian
- Research Center for Analysis and Measurement & College of Materials Science and Engineering , Donghua University , Shanghai 201620 , China
| | - Gang Zhao
- State Key Laboratory for Modification of Chemical Fibers, College of Chemistry, Chemical Engineering and Biotechnology , Donghua University , Shanghai 201620 , China
| | - Shanyi Guang
- Research Center for Analysis and Measurement & College of Materials Science and Engineering , Donghua University , Shanghai 201620 , China
| | - Hongyao Xu
- State Key Laboratory for Modification of Chemical Fibers, College of Chemistry, Chemical Engineering and Biotechnology , Donghua University , Shanghai 201620 , China
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8
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Zhang P, Zhang C, Li J, Han J, Liu X, Yang H. The physical microenvironment of hematopoietic stem cells and its emerging roles in engineering applications. Stem Cell Res Ther 2019; 10:327. [PMID: 31744536 PMCID: PMC6862744 DOI: 10.1186/s13287-019-1422-7] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 08/22/2019] [Accepted: 09/23/2019] [Indexed: 12/18/2022] Open
Abstract
Stem cells are considered the fundamental underpinnings of tissue biology. The stem cell microenvironment provides factors and elements that play significant roles in controlling the cell fate direction. The bone marrow is an important environment for functional hematopoietic stem cells in adults. Remarkable progress has been achieved in the area of hematopoietic stem cell fate modulation based on the recognition of biochemical factors provided by bone marrow niches. In this review, we focus on emerging evidence that hematopoietic stem cell fate is altered in response to a variety of microenvironmental physical cues, such as geometric properties, matrix stiffness, and mechanical forces. Based on knowledge of these biophysical cues, recent developments in harnessing hematopoietic stem cell niches ex vivo are also discussed. A comprehensive understanding of cell microenvironments helps provide mechanistic insights into pathophysiological mechanisms and underlies biomaterial-based hematopoietic stem cell engineering.
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Affiliation(s)
- Pan Zhang
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
- Research Center of Special Environmental Biomechanics & Medical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
| | - Chen Zhang
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
- Research Center of Special Environmental Biomechanics & Medical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
| | - Jing Li
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
- Research Center of Special Environmental Biomechanics & Medical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
| | - Jiyang Han
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
- Research Center of Special Environmental Biomechanics & Medical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
| | - Xiru Liu
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
- Research Center of Special Environmental Biomechanics & Medical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China
| | - Hui Yang
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China.
- Research Center of Special Environmental Biomechanics & Medical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, People's Republic of China.
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9
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Baumgartner W, Schneider I, Hess SC, Stark WJ, Märsmann S, Brunelli M, Calcagni M, Cinelli P, Buschmann J. Cyclic uniaxial compression of human stem cells seeded on a bone biomimetic nanocomposite decreases anti-osteogenic commitment evoked by shear stress. J Mech Behav Biomed Mater 2018; 83:84-93. [DOI: 10.1016/j.jmbbm.2018.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/16/2018] [Accepted: 04/03/2018] [Indexed: 01/01/2023]
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10
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Johns M, Bae Y, Guimarães FEG, Lanzoni EM, Costa CAR, Murray PM, Deneke C, Galembeck F, Scott JL, Sharma RI. Predicting Ligand-Free Cell Attachment on Next-Generation Cellulose-Chitosan Hydrogels. ACS OMEGA 2018; 3:937-945. [PMID: 30023793 PMCID: PMC6045362 DOI: 10.1021/acsomega.7b01583] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/02/2018] [Indexed: 06/08/2023]
Abstract
There is a growing appreciation that engineered biointerfaces can regulate cell behaviors, or functions. Most systems aim to mimic the cell-friendly extracellular matrix environment and incorporate protein ligands; however, the understanding of how a ligand-free system can achieve this is limited. Cell scaffold materials comprised of interfused chitosan-cellulose hydrogels promote cell attachment in ligand-free systems, and we demonstrate the role of cellulose molecular weight, MW, and chitosan content and MW in controlling material properties and thus regulating cell attachment. Semi-interpenetrating network (SIPN) gels, generated from cellulose/ionic liquid/cosolvent solutions, using chitosan solutions as phase inversion solvents, were stable and obviated the need for chemical coupling. Interface properties, including surface zeta-potential, dielectric constant, surface roughness, and shear modulus, were modified by varying the chitosan degree of polymerization and solution concentration, as well as the source of cellulose, creating a family of cellulose-chitosan SIPN materials. These features, in turn, affect cell attachment onto the hydrogels and the utility of this ligand-free approach is extended by forecasting cell attachment using regression modeling to isolate the effects of individual parameters in an initially complex system. We demonstrate that increasing the charge density, and/or shear modulus, of the hydrogel results in increased cell attachment.
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Affiliation(s)
- Marcus
A. Johns
- Department
of Chemical Engineering, Centre for Sustainable Chemical
Technologies, and Department of Chemistry, University of
Bath, Bath BA2 7AY, U.K.
| | - Yongho Bae
- Department
of Pathology and Anatomical Sciences, Jacobs School of Medicine and
Biomedical Sciences, University at Buffalo,
The State University of New York, Buffalo, New York 14203, United States
| | | | - Evandro M. Lanzoni
- Brazilian
Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
- Institute
of Science and Technology, São Paulo
State University (UNESP), Sorocaba, SP 18087-180, Brazil
| | - Carlos A. R. Costa
- Brazilian
Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
| | - Paul M. Murray
- Paul
Murray Catalysis Consulting Ltd., 67 Hudson Close, Yate BS37 4NP, U.K.
| | - Christoph Deneke
- Brazilian
Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
- Departamento
de Física Aplicada, Instituto de Física “Gleb
Wataghin”, Universidade Estadual
de Campinas − UNICAMP, Campinas, SP 13083-859, Brazil
| | - Fernando Galembeck
- Brazilian
Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
| | - Janet L. Scott
- Department
of Chemical Engineering, Centre for Sustainable Chemical
Technologies, and Department of Chemistry, University of
Bath, Bath BA2 7AY, U.K.
| | - Ram I. Sharma
- Department
of Chemical Engineering, Centre for Sustainable Chemical
Technologies, and Department of Chemistry, University of
Bath, Bath BA2 7AY, U.K.
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11
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Wang D, Xuan L, Zhong H, Gong Y, Shi X, Ye F, Li Y, Jiang Q. Incorporation of well-dispersed calcium phosphate nanoparticles into PLGA electrospun nanofibers to enhance the osteogenic induction potential. RSC Adv 2017. [DOI: 10.1039/c7ra01865g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PAA modified Zn-doped HAp-like calcium phosphate (PAA-CaP/Zn) nanoparticles were homogeneously distributed in PLGA electrospun nanofibers, and enhanced the osteogenic differentiation of rADSCs.
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Affiliation(s)
- Dandan Wang
- Department of Biomedical Engineering
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument
- School of Engineering
- Sun Yat-sen University
- Guangzhou
| | - Liuyang Xuan
- Department of Biomedical Engineering
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument
- School of Engineering
- Sun Yat-sen University
- Guangzhou
| | - Huixiang Zhong
- Department of Biomedical Engineering
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument
- School of Engineering
- Sun Yat-sen University
- Guangzhou
| | - Yihong Gong
- Department of Biomedical Engineering
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument
- School of Engineering
- Sun Yat-sen University
- Guangzhou
| | - Xuetao Shi
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou
- P. R. China
| | - Feng Ye
- Key Laboratory of Molecular Biology for Infectious Diseases
- Ministry of Education of China
- The Second Affiliated Hospital
- Chongqing Medical University
- Chongqing
| | - Yan Li
- Department of Biomedical Engineering
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument
- School of Engineering
- Sun Yat-sen University
- Guangzhou
| | - Qing Jiang
- Department of Biomedical Engineering
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument
- School of Engineering
- Sun Yat-sen University
- Guangzhou
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12
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Barner-Kowollik C, Goldmann AS, Schacher FH. Polymer Interfaces: Synthetic Strategies Enabling Functionality, Adaptivity, and Spatial Control. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00650] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Christopher Barner-Kowollik
- Preparative
Macromolecular Chemistry, Institut für Technische Chemie und
Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76128 Karlsruhe, Germany
- Institut
für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- School
of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD 4000, Australia
| | - Anja S. Goldmann
- Preparative
Macromolecular Chemistry, Institut für Technische Chemie und
Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76128 Karlsruhe, Germany
- Institut
für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Felix H. Schacher
- Institute
of Organic and Macromolecular Chemistry (IOMC) and Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, 07743 Jena, Germany
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13
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Wang B, Benitez AJ, Lossada F, Merindol R, Walther A. Bioinspired Mechanical Gradients in Cellulose Nanofibril/Polymer Nanopapers. Angew Chem Int Ed Engl 2016; 55:5966-70. [PMID: 27061218 DOI: 10.1002/anie.201511512] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/29/2016] [Indexed: 12/12/2022]
Abstract
Mechanical gradients are important as tough joints, for strain field engineering in printable electronics, for actuators, and for biological studies, yet they are difficult to prepare and quantitatively characterize. We demonstrate the additive fabrication of gradient bioinspired nanocomposites based on stiff, renewable cellulose nanofibrils that are bottom-up toughened via a tailor-made copolymer. Direct filament writing of different nanocomposite hydrogels in patterns, and subsequent healing of the filaments into continuous films while drying leads to a variety of linear, parabolic and striped bulk gradients. In situ digital image correlation under tensile deformation reveals important differences in the strain fields regarding asymmetry and step heights of the patterns. We envisage that merging top-down and bottom-up structuring of nanocellulose hybrids opens avenues for aperiodic and multiscale, bioinspired nanocomposites with optimized combinations of stiffness and toughness.
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Affiliation(s)
- Baochun Wang
- DWI-, Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
| | - Alejandro J Benitez
- DWI-, Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
| | - Francisco Lossada
- DWI-, Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
| | - Remi Merindol
- DWI-, Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
| | - Andreas Walther
- DWI-, Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany.
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14
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Wang B, Benitez AJ, Lossada F, Merindol R, Walther A. Bioinspired Mechanical Gradients in Cellulose Nanofibril/Polymer Nanopapers. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511512] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Baochun Wang
- DWI— Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany
| | - Alejandro J. Benitez
- DWI— Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany
| | - Francisco Lossada
- DWI— Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany
| | - Remi Merindol
- DWI— Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany
| | - Andreas Walther
- DWI— Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany
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15
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Whang M, Kim J. Synthetic hydrogels with stiffness gradients for durotaxis study and tissue engineering scaffolds. Tissue Eng Regen Med 2016; 13:126-139. [PMID: 30603392 PMCID: PMC6170857 DOI: 10.1007/s13770-016-0026-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/02/2016] [Accepted: 03/03/2016] [Indexed: 12/21/2022] Open
Abstract
Migration of cells along the right direction is of paramount importance in a number of in vivo circumstances such as immune response, embryonic developments, morphogenesis, and healing of wounds and scars. While it has been known for a while that spatial gradients in chemical cues guide the direction of cell migration, the significance of the gradient in mechanical cues, such as stiffness of extracellular matrices (ECMs), in directed migration of cells has only recently emerged. With advances in synthetic chemistry, micro-fabrication techniques, and methods to characterize mechanical properties at a length scale even smaller than a single cell, synthetic ECMs with spatially controlled stiffness have been created with variations in design parameters. Since then, the synthetic ECMs have served as platforms to study the migratory behaviors of cells in the presence of the stiffness gradient of ECM and also as scaffolds for the regeneration of tissues. In this review, we highlight recent studies in cell migration directed by the stiffness gradient, called durotaxis, and discuss the mechanisms of durotaxis. We also summarize general methods and design principles to create synthetic ECMs with the stiffness gradients and, finally, conclude by discussing current limitations and future directions of synthetic ECMs for the study of durotaxis and the scaffold for tissue engineering.
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Affiliation(s)
- Minji Whang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Korea
| | - Jungwook Kim
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Korea
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16
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Valuev LI, Valuev IL, Vanchugova LV, Obydennova IV. Effect of polyacrylamide hydrogel pore size on the activity of immobilized peptide. POLYMER SCIENCE SERIES B 2015. [DOI: 10.1134/s1560090415050176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Valuev LI, Valuev IL, Vanchugova LV, Valueva TA. Effect of the hydrogel carrier structure on the Activity of immobilized trypsin. APPL BIOCHEM MICRO+ 2015. [DOI: 10.1134/s0003683815050178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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M. Jonker A, A. Bode S, H. Kusters A, van Hest JCM, Löwik DWPM. Soft PEG-Hydrogels with Independently Tunable Stiffness and RGDS-Content for Cell Adhesion Studies. Macromol Biosci 2015; 15:1338-47. [DOI: 10.1002/mabi.201500110] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 05/20/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Anika M. Jonker
- Radboud University; Heyendaalseweg 135 6525 AJ Nijmegen the Netherlands
| | - Saskia A. Bode
- Radboud University; Heyendaalseweg 135 6525 AJ Nijmegen the Netherlands
| | - Addie H. Kusters
- Radboud University; Heyendaalseweg 135 6525 AJ Nijmegen the Netherlands
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Evingür GA, Pekcan Ö. Kinetic models for the dynamical behavior of polyacrylamide (PAAm)-κ-carrageenan (κC) composite gels. J Biol Phys 2014; 41:37-47. [PMID: 25304224 DOI: 10.1007/s10867-014-9364-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 08/25/2014] [Indexed: 11/25/2022] Open
Abstract
A fluorescence method was employed for studying the drying and swelling of PAAm-κC composite gels, which were formed from acrylamide (AAm) and N, N'- methylenebisacrylamide (BIS) with various κ-carrageenan (κC) contents by free radical crosslinking copolymerization in water. Composite gels were prepared at 80 °C with pyranine (Py) as a fluorescence probe. Scattered light, I sc, and fluorescence emission intensities, I em, were monitored during drying and swelling of these gels. The fluorescence intensity of pyranine increased and decreased as drying and swelling time are increased, respectively, for all gel samples. The Stern-Volmer equation combined with moving boundary and Li-Tanaka models were used to explain the behavior of I em during drying and swelling processes respectively. It is found that the desorption coefficient D d decreased as κC contents were increased for a given temperature during drying. However, the cooperative diffusion coefficient, D s presented exactly the opposite case. Conventional gravimetrical and volumetric experiments were also carried out during drying and swelling of PAAm-κC composite gels. It was observed that D d and D s values measured with the fluorescence method were found to be much larger than they were measured with the conventional methods.
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Synthesis and photopolymerisation of maleic polyvinyl alcohol based hydrogels for bone tissue engineering. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0538-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Han Y, Zeng Q, Li H, Chang J. The calcium silicate/alginate composite: preparation and evaluation of its behavior as bioactive injectable hydrogels. Acta Biomater 2013; 9:9107-17. [PMID: 23796407 DOI: 10.1016/j.actbio.2013.06.022] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 06/09/2013] [Accepted: 06/14/2013] [Indexed: 12/22/2022]
Abstract
In this study, an injectable calcium silicate (CS)/sodium alginate (SA) hybrid hydrogel was prepared using a novel material composition design. CS was incorporated into an alginate solution and internal in situ gelling was induced by the calcium ions directly released from CS with the addition of d-gluconic acid δ-lactone (GDL). The gelling time could be controlled, from about 30s to 10 min, by varying the amounts of CS and GDL added. The mechanical properties of the hydrogels with different amounts of CS and GDL were systematically analyzed. The compressive strength of 5% CS/SA hydrogels was higher than that of 10% CS/SA for the same amount of GDL. The swelling behaviors of 5% CS/SA hydrogels with different contents of GDL were therefore investigated. The swelling ratios of the hydrogels decreased with increasing GDL, and 5% CS/SA hydrogel with 1% GDL swelled by only less than 5%. Scanning electron microscopy (SEM) observation of the scaffolds showed an optimal interconnected porous structure, with the pore size ranging between 50 and 200 μm. Fourier transform infrared spectroscopy and SEM showed that the CS/SA composite hydrogel induced the formation of hydroxyapatite on the surface of the materials in simulated body fluid. In addition, rat bone mesenchymal stem cells (rtBMSCs) cultured in the presence of hydrogels and their ionic extracts were able to maintain the viability and proliferation. Furthermore, the CS/SA composite hydrogel and its ionic extracts stimulated rtBMSCs to produce alkaline phosphatase, and its ionic extracts could also promote angiogenesis of human umbilical vein endothelial cells. Overall, all these results indicate that the CS/SA composite hydrogel efficiently supported the adhesion, proliferation and differentiation of osteogenic and angiogenic cells. Together with its porous three-dimensional structure and injectable properties, CS/SA composite hydrogel possesses great potential for bone regeneration and tissue engineering applications.
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Zhang X, Zhang Y, Chen W, Xu L, Wei S, Zheng Y, Zhai M. Biological behavior of fibroblast on contractile collagen hydrogel crosslinked by γ-irradiation. J Biomed Mater Res A 2013; 102:2669-79. [DOI: 10.1002/jbm.a.34938] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 08/14/2013] [Accepted: 08/20/2013] [Indexed: 01/16/2023]
Affiliation(s)
- Xiangmei Zhang
- Beijing Key Laboratory for Solid Waste Utilization and Management; College of Engineering, Peking University; Beijing 100871 China
- Center for Biomedical Materials and Tissue Engineering; Academy for Advanced Interdisciplinary Studies, Peking University; Beijing 100871 China
| | - Yaqing Zhang
- Beijing Key Laboratory for Solid Waste Utilization and Management; College of Engineering, Peking University; Beijing 100871 China
- Center for Biomedical Materials and Tissue Engineering; Academy for Advanced Interdisciplinary Studies, Peking University; Beijing 100871 China
| | - Wenqiang Chen
- Center for Biomedical Materials and Tissue Engineering; Academy for Advanced Interdisciplinary Studies, Peking University; Beijing 100871 China
| | - Ling Xu
- Beijing Key Laboratory for Solid Waste Utilization and Management; College of Engineering, Peking University; Beijing 100871 China
- Center for Biomedical Materials and Tissue Engineering; Academy for Advanced Interdisciplinary Studies, Peking University; Beijing 100871 China
- Shenzhen Key Laboratory for Polymer Science; Peking University, ShenZhen Institution; Shenzhen 518057 China
| | - Shicheng Wei
- Center for Biomedical Materials and Tissue Engineering; Academy for Advanced Interdisciplinary Studies, Peking University; Beijing 100871 China
- Department of Oral and Maxillofacial Surgery; School and Hospital of Stomatology, Peking University; Beijing 100081 China
| | - Yufeng Zheng
- Center for Biomedical Materials and Tissue Engineering; Academy for Advanced Interdisciplinary Studies, Peking University; Beijing 100871 China
| | - Maolin Zhai
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
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