1201
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Terzic A, Nelson TJ. Regenerative medicine primer. Mayo Clin Proc 2013; 88:766-75. [PMID: 23809322 DOI: 10.1016/j.mayocp.2013.04.017] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 04/12/2013] [Accepted: 04/16/2013] [Indexed: 01/14/2023]
Abstract
The pandemic of chronic diseases, compounded by the scarcity of usable donor organs, mandates radical innovation to address the growing unmet needs of individuals and populations. Beyond life-extending measures that are often the last available option, regenerative strategies offer transformative solutions in treating degenerative conditions. By leveraging newfound knowledge of the intimate processes fundamental to organogenesis and healing, the emerging regenerative armamentarium aims to boost the aptitude of human tissues for self-renewal. Regenerative technologies strive to promote, augment, and reestablish native repair processes, restituting organ structure and function. Multimodal regenerative approaches incorporate transplant of healthy tissues into damaged environments, prompt the body to enact a regenerative response in damaged tissues, and use tissue engineering to manufacture new tissue. Stem cells and their products have a unique aptitude to form specialized tissues and promote repair signaling, providing active ingredients of regenerative regimens. Concomitantly, advances in materials science and biotechnology have unlocked additional prospects for growing tissue grafts and engineering organs. Translation of regenerative principles into practice is feasible and safe in the clinical setting. Regenerative medicine and surgery are, thus, poised to transit from proof-of-principle studies toward clinical validation and, ultimately, standardization, paving the way for next-generation individualized management algorithms.
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Affiliation(s)
- Andre Terzic
- Mayo Clinic Center for Regenerative Medicine, Mayo Clinic, Rochester, MN; Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Rochester, MN; Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN; Department of Medical Genetics, Mayo Clinic, Rochester, MN.
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1202
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Photolatently modulable hydrogels using unilamellar titania nanosheets as photocatalytic crosslinkers. Nat Commun 2013; 4:2029. [DOI: 10.1038/ncomms3029] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 05/22/2013] [Indexed: 11/09/2022] Open
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1203
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Chao D, Rong W, Wei C, Feng-hua M, Ru C, Zhi-yuan Z. DESIGN AND SYNTHESIS OF RAPIDLY PHOTO-CROSSLINKABLE BIOACTIVE BIODEGRADABLE HYDROGELS. ACTA POLYM SIN 2013. [DOI: 10.3724/sp.j.1105.2013.12426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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1204
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Shi X, Zhou J, Zhao Y, Li L, Wu H. Gradient-regulated hydrogel for interface tissue engineering: steering simultaneous osteo/chondrogenesis of stem cells on a chip. Adv Healthc Mater 2013. [PMID: 23193109 DOI: 10.1002/adhm.201200333] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Injury to articular cartilage, especially the defects induced by degenerative diseases has presented insurmountable challenges. Elaborating a replacement of articular cartilage using biomimic tissue-engineering strategies provides a promising remedy. However, none of the previous osteo/chondrogenic methodologies can not only simultaneously induce osteo/chondrogenesis of stem cells in one scaffolding niche, but also generate a biomimic interface between the formed osteogenic and chondrogenic zones. We report here an innovative method using biomicrofluidic techniques to simultaneously steer distinct specialized differentiation of stem cells into chondrocytes and osteoblasts in one hydrogel slab. Importantly, a gradient that mimics the interface of bone-to-cartilage was generated in the middle of the hydrogel slab. We compared this format with the conventional method for osteochondrogenesis; this format using the gradient-generating microfluidic device indicated outstanding superiorities in stem cell culture and differentiation. Our findings will have a major impact on the design of versatile biomicrofluidic devices for interfacial tissue regeneration.
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Affiliation(s)
- Xuetao Shi
- WPI‐Advanced Institute for Materials Research, Tohoku University, Sendai 980‐8578, Japan
| | - Jianhua Zhou
- WPI‐Advanced Institute for Materials Research, Tohoku University, Sendai 980‐8578, Japan
- Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China
| | - Yihua Zhao
- Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China
| | - Lei Li
- Key Laboratory of Cryogenics & Beijing Key, Laboratory of Cryo‐Biomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China
| | - Hongkai Wu
- WPI‐Advanced Institute for Materials Research, Tohoku University, Sendai 980‐8578, Japan
- Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China
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1205
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Lee C, Shin J, Lee JS, Byun E, Ryu JH, Um SH, Kim DI, Lee H, Cho SW. Bioinspired, Calcium-Free Alginate Hydrogels with Tunable Physical and Mechanical Properties and Improved Biocompatibility. Biomacromolecules 2013; 14:2004-13. [DOI: 10.1021/bm400352d] [Citation(s) in RCA: 204] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Changhyun Lee
- Department of Biotechnology, Yonsei University, Seoul 120-749, Republic
of Korea
| | - Jisoo Shin
- Department of Biotechnology, Yonsei University, Seoul 120-749, Republic
of Korea
| | - Jung Seung Lee
- Department of Biotechnology, Yonsei University, Seoul 120-749, Republic
of Korea
| | | | | | - Soong Ho Um
- School of Chemical
Engineering and SKKU Advanced Institute of
Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Dong-Ik Kim
- Division of Vascular
Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Republic
of Korea
| | | | - Seung-Woo Cho
- Department of Biotechnology, Yonsei University, Seoul 120-749, Republic
of Korea
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1206
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Vats K, Benoit DSW. Dynamic manipulation of hydrogels to control cell behavior: a review. TISSUE ENGINEERING PART B-REVIEWS 2013; 19:455-69. [PMID: 23541134 DOI: 10.1089/ten.teb.2012.0716] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
For many tissue engineering applications and studies to understand how materials fundamentally affect cellular functions, it is important to have the ability to synthesize biomaterials that can mimic elements of native cell-extracellular matrix interactions. Hydrogels possess many properties that are desirable for studying cell behavior. For example, hydrogels are biocompatible and can be biochemically and mechanically altered by exploiting the presentation of cell adhesive epitopes or by changing hydrogel crosslinking density. To establish physical and biochemical tunability, hydrogels can be engineered to alter their properties upon interaction with external driving forces such as pH, temperature, electric current, as well as exposure to cytocompatible irradiation. Additionally, hydrogels can be engineered to respond to enzymes secreted by cells, such as matrix metalloproteinases and hyaluronidases. This review details different strategies and mechanisms by which biomaterials, specifically hydrogels, can be manipulated dynamically to affect cell behavior. By employing the appropriate combination of stimuli and hydrogel composition and architecture, cell behavior such as adhesion, migration, proliferation, and differentiation can be controlled in real time. This three-dimensional control in cell behavior can help create programmable cell niches that can be useful for fundamental cell studies and in a variety of tissue engineering applications.
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Affiliation(s)
- Kanika Vats
- 1 Department of Biomedical Engineering, University of Rochester , Rochester, New York
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1207
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Wu XL, Wen T, Guo HL, Yang S, Wang X, Xu AW. Biomass-derived sponge-like carbonaceous hydrogels and aerogels for supercapacitors. ACS NANO 2013; 7:3589-97. [PMID: 23548083 DOI: 10.1021/nn400566d] [Citation(s) in RCA: 245] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
As a newly developed material, carbon gels have been receiving considerable attention due to their multifunctional properties. Herein, we present a facile, green, and template-free route toward sponge-like carbonaceous hydrogels and aerogels by using crude biomass, watermelon as the carbon source. The obtained three-dimensional (3D) flexible carbonaceous gels are made of both carbonaceous nanofibers and nanospheres. The porous carbonaceous gels (CGs) are highly chemically active and show excellent mechanical flexibility which enable them to be a good scaffold for the synthesis of 3D composite materials. We synthesized the carbonaceous gel-based composite materials by incorporating Fe3O4 nanoparticles into the networks of the carbonaceous gels. The Fe3O4/CGs composites further transform into magnetite carbon aerogels (MCAs) by calcination. The MCAs keep the porous structure of the original CGs, which allows the sustained and stable transport of both electrolyte ions and electrons to the electrode surface, leading to excellent electrochemical performance. The MCAs exhibit an excellent capacitance of 333.1 F·g(-1) at a current density of 1 A·g(-1) within a potential window of -1.0 to 0 V in 6 M KOH solution. Meanwhile, the MCAs also show outstanding cycling stability with 96% of the capacitance retention after 1000 cycles of charge/discharge. These findings open up the use of low-cost elastic carbon gels for the synthesis of other 3D composite materials and show the possibility for the application in energy storage.
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Affiliation(s)
- Xi-Lin Wu
- School of Nuclear Science and Technology, Division of Nanomaterials & Chemistry, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
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1208
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Andreasen SØ, Chong SF, Wohl BM, Goldie KN, Zelikin AN. Poly(vinyl alcohol) physical hydrogel nanoparticles, not polymer solutions, exert inhibition of nitric oxide synthesis in cultured macrophages. Biomacromolecules 2013; 14:1687-95. [PMID: 23560438 DOI: 10.1021/bm400369u] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hydrogel nanoparticles (HNP) are an emerging tool of biomedicine with unique materials characteristics, scope, and utility. These hydrated, soft colloidal carriers can penetrate through voids with dimensions narrower than the size of the particle, provide stabilization for fragile biological cargo and allow diffusion and exchange of solutes with external phase. However, techniques to assemble HNP are few; solitary examples exist of biocompatible polymers being formulated into HNP; and knowledge on the biomedical properties of HNP remains rather cursory. In this work, we investigate assembly of HNP based on a polymer with decades of prominence in the biomedical field, poly(vinyl alcohol), PVA. We develop a novel method for production of PVA HNP through nanoprecipitation-based assembly of polymer nanoparticles and subsequent physical hydrogelation of the polymer. Polymer nanoparticles and HNP were visualized using scanning electron microscopy and fluorescence imaging, and characterized using dynamic light scattering and zeta potential measurements. Interaction of PVA HNP with mammalian cells was investigated using flow cytometry, viability screening, and measurements of nitric oxide production by cultured macrophages. The latter analyses revealed that PVA administered as a polymer solution or in the form of HNP resulted in no measurable increase in production of the inflammation marker. Unexpectedly, PVA HNP exerted a pronounced inhibition of NO synthesis by stimulated macrophages, that is, had an anti-inflammatory activity. This effect was accomplished with a negligible change in the cell viability and was not observed when PVA was administered as a polymer solution. To the best of our knowledge, this is the first observation of inhibition of NO synthesis in macrophages by administered nanoparticles and specifically hydrogel nanoparticles. Taken together, our results present PVA HNP as promising colloidal hydrogel nanocarriers for biomedical applications, specifically drug delivery and assembly of intracellular biosensors.
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1209
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Pandiyarajan CK, Prucker O, Zieger B, Rühe J. Influence of the molecular structure of surface-attached poly(N-alkyl acrylamide) coatings on the interaction of surfaces with proteins, cells and blood platelets. Macromol Biosci 2013; 13:873-84. [PMID: 23596084 DOI: 10.1002/mabi.201200445] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Revised: 01/10/2013] [Indexed: 11/10/2022]
Abstract
Blood protein adsorption and blood platelet adhesion onto surface-attached poly(alkylacrylamide) networks that exhibit small and systematic variations in chemical composition are investigated. The polymer coatings are generated by depositing a thin layer of benzophenone-group-containing copolymer onto a solid substrate, followed by photo crosslinking and simultaneous surface-attachment. The correlation of the swelling of the obtained surface-attached networks with the adsorption of blood proteins and cellular adhesion is studied. The swollen surface-attached layers are inert to blood proteins and platelet cells. These results suggest that the hydrogel-coated materials are promising candidates for the generation of hemocompatible surfaces.
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Affiliation(s)
- C K Pandiyarajan
- Laboratory for Chemistry and Physics of Interfaces, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg, Germany
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1210
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Ben-David D, Srouji S, Shapira-Schweitzer K, Kossover O, Ivanir E, Kuhn G, Müller R, Seliktar D, Livne E. Low dose BMP-2 treatment for bone repair using a PEGylated fibrinogen hydrogel matrix. Biomaterials 2013; 34:2902-10. [DOI: 10.1016/j.biomaterials.2013.01.035] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Accepted: 01/04/2013] [Indexed: 01/14/2023]
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1211
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Guvendiren M, Burdick JA. Engineering synthetic hydrogel microenvironments to instruct stem cells. Curr Opin Biotechnol 2013; 24:841-6. [PMID: 23545441 DOI: 10.1016/j.copbio.2013.03.009] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 03/11/2013] [Accepted: 03/11/2013] [Indexed: 11/08/2022]
Abstract
Advances in our understanding and ability to manipulate stem cell behavior are helping to move stem cell-based therapies toward the clinic. However, much of our knowledge has been gained from standard 2-dimensional culture systems, which often misrepresent many of the signals that stem cells receive in their native 3-dimensional environments. Fortunately, the field of synthetic hydrogels is developing to better recapitulate many of these signals to guide stem cell behavior, both as in vitro models and as delivery vehicles for in vivo implantation. These include a multitude of structural and biochemical cues that can be presented on the cellular scale, such as degradation, adhesion, mechanical signals, topography, and the presentation of growth factors, often with precise spatiotemporal control.
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Affiliation(s)
- Murat Guvendiren
- Department of Bioengineering, University of Pennsylvania, PA 19104, USA
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1212
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Ferris CJ, Gilmore KG, Wallace GG, In het Panhuis M. Biofabrication: an overview of the approaches used for printing of living cells. Appl Microbiol Biotechnol 2013; 97:4243-58. [PMID: 23525900 DOI: 10.1007/s00253-013-4853-6] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Revised: 03/09/2013] [Accepted: 03/11/2013] [Indexed: 02/01/2023]
Abstract
The development of cell printing is vital for establishing biofabrication approaches as clinically relevant tools. Achieving this requires bio-inks which must not only be easily printable, but also allow controllable and reproducible printing of cells. This review outlines the general principles and current progress and compares the advantages and challenges for the most widely used biofabrication techniques for printing cells: extrusion, laser, microvalve, inkjet and tissue fragment printing. It is expected that significant advances in cell printing will result from synergistic combinations of these techniques and lead to optimised resolution, throughput and the overall complexity of printed constructs.
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Affiliation(s)
- Cameron J Ferris
- Soft Materials Group, School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia
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1213
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Fabrication of in vitro three-dimensional multilayered blood vessel model using human endothelial and smooth muscle cells and high-strength PEG hydrogel. J Biosci Bioeng 2013; 116:231-4. [PMID: 23523382 DOI: 10.1016/j.jbiosc.2013.02.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Revised: 02/07/2013] [Accepted: 02/21/2013] [Indexed: 11/22/2022]
Abstract
We fabricated a three-dimensional multilayered blood vessel model using human cells and high-strength PEG hydrogel. The hydrogel tube was physically suitable for perfusion culture, and cells were cultured on the hydrogel surface by binding with fibronectin. Using the layer-by-layer cell multilayered technique, we successfully constructed an artificial blood vessel.
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1214
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Lu CH, Qi XJ, Orbach R, Yang HH, Mironi-Harpaz I, Seliktar D, Willner I. Switchable catalytic acrylamide hydrogels cross-linked by hemin/G-quadruplexes. NANO LETTERS 2013; 13:1298-1302. [PMID: 23421921 DOI: 10.1021/nl400078g] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Copolymer chains consisting of acrylamide units and guanine (G)-containing oligonucleotide-tethered acrylamide units undergo, in the presence of K(+) ions, cross-linking by G-quadruplexes to yield a hydrogel. The hydrogel is dissociated upon addition of 18-crown-6 ether that traps the K(+) ions. Reversible formation and dissociation of the hydrogel is demonstrated by the cyclic addition of K(+) ions and 18-crown-6 ether, respectively. Formation of the hydrogel in the presence of hemin results in a hemin/G-quadruplex-cross-linked catalytic hydrogel mimicking the function of horseradish peroxidase, reflected by the catalyzed oxidation of 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulfonic acid), ABTS(2-), by H2O2 to ABTS(·-) and by the catalyzed generation of chemiluminescence in the presence of luminol/H2O2. Cyclic "ON" and "OFF" activation of the catalytic functions of the hydrogel are demonstrated upon the formation of the hydrogel in the presence of K(+) ions and its dissociation by 18-crown-6 ether, respectively. The hydrogel is characterized by rheology measurements, circular dichroism, and probing its chemical and photophysical properties.
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Affiliation(s)
- Chun-Hua Lu
- Institute of Chemistry, The Hebrew University of Jerusalem and The Center for Nanoscience and Nanotechnology, Jerusalem 91904, Israel
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1215
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Allazetta S, Hausherr TC, Lutolf MP. Microfluidic synthesis of cell-type-specific artificial extracellular matrix hydrogels. Biomacromolecules 2013; 14:1122-31. [PMID: 23439131 DOI: 10.1021/bm4000162] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Droplet microfluidic technology is applied for the high-throughput synthesis via Michael-type addition of reactive, micrometer-sized poly(ethylene glycol) (PEG) hydrogels ("microgels") with precisely controlled dimension and physicochemical properties. A versatile chemical scheme is used to modify the reactive PEG microgels with tethered biomolecules to tune their bioactive properties for the bioreactor culture and manipulation of various (stem) cell types.
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Affiliation(s)
- Simone Allazetta
- Laboratory of Stem Cell Bioengineering, Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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1216
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Grevesse T, Versaevel M, Circelli G, Desprez S, Gabriele S. A simple route to functionalize polyacrylamide hydrogels for the independent tuning of mechanotransduction cues. LAB ON A CHIP 2013; 13:777-80. [PMID: 23334710 DOI: 10.1039/c2lc41168g] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Physico-chemical and biochemical factors in the local cellular microenvironment are known to impact on multiple aspects of cell behaviour through specific signal pathways. These mechanotransduction cues can couple each other to regulate cell fate, and it remains unclear whether mechanotransduction in different contexts shares common mechanisms. Undoubtedly, a challenge will involve the further characterization of such cooperative mechanisms, as well as clearly defining the individual role of each mechanical and biochemical parameter. To control these mechanotransduction cues in an independent manner, we developed a simple and efficient strategy to immobilize any desired nature of proteins on polyacrylamide hydrogels and independently control various parameters of the cell microenvironment, such as matrix stiffness, cell-binding ligand density and confined adhesiveness. This novel platform is validated by conducting single-cell experiments and opens a broad avenue for studying complex interplays involved in mechanotransduction with a facile and versatile approach.
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Affiliation(s)
- Thomas Grevesse
- Mechanobiology & Soft Matter Group, Interfaces et Fluides Complexes, CIRMAP, Biosciences and Complexys Research Institutes, Université de Mons, Mons, Belgium
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1217
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Liao SW, Rawson J, Omori K, Ishiyama K, Mozhdehi D, Oancea AR, Ito T, Guan Z, Mullen Y. Maintaining functional islets through encapsulation in an injectable saccharide-peptide hydrogel. Biomaterials 2013; 34:3984-3991. [PMID: 23465491 DOI: 10.1016/j.biomaterials.2013.02.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 02/01/2013] [Indexed: 12/31/2022]
Abstract
Islet transplantation offers a promising treatment for type 1 diabetes (T1D). However, a major hurdle in this treatment is the rapid loss of functional islets during culture and after transplantation. The liver site, currently utilized for transplantation, is suboptimal for achieving long-term insulin independence due to a rapid islet loss followed by a chronic decline in islet function after transplantation. Herein, we report a synthetic saccharide-peptide (SP) hydrogel that allows suspending islets in liquid and injecting for in situ polymerization without forming islet clumps, indicating its potential in extrahepatic islet transplantation. In vitro, rat islets in SP hydrogel maintained a 3D structure and high glucose-stimulated insulin release similar to that observed in freshly isolated islets for 4 weeks, while control islets cultured in suspension lost their 3D structure and insulin release responses by 2 weeks. Biocompatibility of SP hydrogel was shown by the absence of cytokine mRNA activation in peripheral blood mononuclear cells (PBMCs) exposed to hydrogel in vitro and by the absence of cellular infiltrates in and around the hydrogel implanted subcutaneously. Syngeneic Lewis rat islets transplanted in SP hydrogel in various extrahepatic sites stained strongly for insulin, and more effectively reversed diabetes than unencapsulated islets when transplanted in an omental pocket. In conclusion, the SP hydrogel is non-cytotoxic and supports normal islet structure and function both in vitro and in vivo. Specifically, the ability of the hydrogel to separate individual islets after transplantation is important for maintaining their function in vivo. This important property, combined with the versatility and biocompatibility, makes our SP hydrogel a promising synthetic scaffold that can facilitate transplantation of organized heterogeneous cells to preserve their micro-structure and function.
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Affiliation(s)
- Sophia W Liao
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jeffrey Rawson
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Keiko Omori
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Kohei Ishiyama
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Davoud Mozhdehi
- Department of Chemistry, University of California, 1102 Natural Sciences II, Irvine 92606, USA
| | - Alina R Oancea
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Taihei Ito
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Zhibin Guan
- Department of Chemistry, University of California, 1102 Natural Sciences II, Irvine 92606, USA.
| | - Yoko Mullen
- Southern California Islet Cell Resources Center, Department of Diabetes, Endocrinology and Metabolism, Beckman Research Institute of the City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA.
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1218
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Gurkan UA, Fan Y, Xu F, Erkmen B, Urkac ES, Parlakgul G, Bernstein J, Xing W, Boyden ES, Demirci U. Simple precision creation of digitally specified, spatially heterogeneous, engineered tissue architectures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:1192-8. [PMID: 23192949 PMCID: PMC3842103 DOI: 10.1002/adma.201203261] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 10/04/2012] [Indexed: 05/04/2023]
Affiliation(s)
- Umut Atakan Gurkan
- Harvard Medical School, Division of Biomedical Engineering at Brigham and Women's Hospital, Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Yantao Fan
- Harvard Medical School, Division of Biomedical Engineering at Brigham and Women's Hospital, Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Feng Xu
- Harvard Medical School, Division of Biomedical Engineering at Brigham and Women's Hospital, Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Burcu Erkmen
- Harvard Medical School, Division of Biomedical Engineering at Brigham and Women's Hospital, Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Emel Sokullu Urkac
- Harvard Medical School, Division of Biomedical Engineering at Brigham and Women's Hospital, Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Gunes Parlakgul
- Harvard Medical School, Division of Biomedical Engineering at Brigham and Women's Hospital, Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Jacob Bernstein
- Media Lab and McGovern Institute, Departments of Brain and Cognitive Sciences and Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Wangli Xing
- Medical Systems Biology Research Center, School of Medicine, Tsinghua University, Beijing 100084, PR China, National Engineering Research Center for Beijing Biochip Technology, 18 Life Science Parkway, Beijing, 102206, P. R. China
| | - Edward S. Boyden
- Media Lab and McGovern Institute, Departments of Brain and Cognitive Sciences and Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Utkan Demirci
- Harvard Medical School, Brigham and Women's Hospital, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
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1219
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Structural and magnetic behavior of ferrogels obtained by freezing thawing of polyvinyl alcohol/poly(acrylic acid) (PAA)-coated iron oxide nanoparticles. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2012.11.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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1220
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Oliveira MB, Mano JF. On-Chip Assessment of the Protein-Release Profile from 3D Hydrogel Arrays. Anal Chem 2013; 85:2391-6. [DOI: 10.1021/ac303405x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Mariana B. Oliveira
- 3B’s Research Group − Biomaterials, Biodegradables
and Biomimetics, University of Minho, Headquarters of the European
Institute of Excellence on Tissue Engineering and Regenerative Medicine,
AvePark, 4806-909 Taipas, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate
Laboratory, Braga/Guimarães, Portugal
| | - João F. Mano
- 3B’s Research Group − Biomaterials, Biodegradables
and Biomimetics, University of Minho, Headquarters of the European
Institute of Excellence on Tissue Engineering and Regenerative Medicine,
AvePark, 4806-909 Taipas, Guimarães, Portugal
- ICVS/3B’s, PT Government Associate
Laboratory, Braga/Guimarães, Portugal
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1221
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Synthetic and bio-artificial tactile sensing: a review. SENSORS 2013; 13:1435-66. [PMID: 23348032 PMCID: PMC3649411 DOI: 10.3390/s130201435] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 12/31/2012] [Accepted: 01/11/2013] [Indexed: 01/09/2023]
Abstract
This paper reviews the state of the art of artificial tactile sensing, with a particular focus on bio-hybrid and fully-biological approaches. To this aim, the study of physiology of the human sense of touch and of the coding mechanisms of tactile information is a significant starting point, which is briefly explored in this review. Then, the progress towards the development of an artificial sense of touch are investigated. Artificial tactile sensing is analysed with respect to the possible approaches to fabricate the outer interface layer: synthetic skin versus bio-artificial skin. With particular respect to the synthetic skin approach, a brief overview is provided on various technologies and transduction principles that can be integrated beneath the skin layer. Then, the main focus moves to approaches characterized by the use of bio-artificial skin as an outer layer of the artificial sensory system. Within this design solution for the skin, bio-hybrid and fully-biological tactile sensing systems are thoroughly presented: while significant results have been reported for the development of tissue engineered skins, the development of mechanotransduction units and their integration is a recent trend that is still lagging behind, therefore requiring research efforts and investments. In the last part of the paper, application domains and perspectives of the reviewed tactile sensing technologies are discussed.
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1222
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Takei T, Sugihara K, Yoshida M, Kawakami K. Injectable and biodegradable sugar beet pectin/gelatin hydrogels for biomedical applications. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2013; 24:1333-42. [DOI: 10.1080/09205063.2012.757727] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Takayuki Takei
- a Department of Chemical Engineering, Graduate School of Science and Engineering , Kagoshima University , 1-21-40 Korimoto, Kagoshima , 890-0065 , Japan
| | - Kotaro Sugihara
- b Department of Chemical Engineering, Graduate School of Engineering , Kyushu University , 744 Motooka, Nishi-ku, Fukuoka , 819-0385 , Japan
| | - Masahiro Yoshida
- a Department of Chemical Engineering, Graduate School of Science and Engineering , Kagoshima University , 1-21-40 Korimoto, Kagoshima , 890-0065 , Japan
| | - Koei Kawakami
- b Department of Chemical Engineering, Graduate School of Engineering , Kyushu University , 744 Motooka, Nishi-ku, Fukuoka , 819-0385 , Japan
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1223
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Fejerskov B, Smith AAA, Jensen BEB, Hussmann T, Zelikin AN. Bioresorbable surface-adhered enzymatic microreactors based on physical hydrogels of poly(vinyl alcohol). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:344-354. [PMID: 23210621 DOI: 10.1021/la3040903] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hydrogel biomaterials based on poly(vinyl alcohol), PVA, have an extensive history of biomedical applications, yet in their current form suffer from significant shortcomings, such as a lack of mechanism of biodegradation and poor opportunities in controlled drug release. We investigate physical hydrogels of PVA as surface-adhered materials and present biodegradable matrices equipped with innovative tools in substrate-mediated drug release. Toward the final goal, PVA chains with narrow polydispersities (1.1-1.2) and molecular weights of 5, 10, and 28 kDa are synthesized via controlled radical polymerization (RAFT). These molecular weights are shown to be suitably high to afford robust hydrogel matrices and at the same time suitably low to allow gradual erosion of the hydrogels with kinetics of degradation controlled via polymer macromolecular characteristics. For opportunities in controlled drug release, hydrogels are equipped with enzymatic cargo to achieve an in situ conversion of externally added prodrug into a final product, thus giving rise to surface-adhered enzymatic microreactors. Hydrogel-mediated enzymatic activity was investigated as a function of polymer molecular weight and concentration of solution taken for assembly of hydrogels. Taken together, we present, to the best of our knowledge, the first example of bioresorbable physical hydrogel based on PVA with engineered opportunities in substrate-mediated enzymatic activity and envisioned utility in surface-mediated drug delivery and tissue engineering.
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1224
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Photocrosslinked nanocomposite hydrogels from PEG and silica nanospheres: structural, mechanical and cell adhesion characteristics. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:1800-7. [PMID: 23827639 DOI: 10.1016/j.msec.2012.12.099] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 10/05/2012] [Accepted: 12/31/2012] [Indexed: 02/02/2023]
Abstract
Photopolymerized hydrogels are extensively investigated for various tissue engineering applications, primarily due to their ability to form hydrogels in a minimally invasive manner. Although photocrosslinkable hydrogels provide necessary biological and chemical characteristics to mimic cellular microenvironments, they often lack sufficient mechanical properties. Recently, nanocomposite approaches have demonstrated potential to overcome these deficits by reinforcing the hydrogel network with. In this study, we investigate some physical, chemical, and biological properties of photocrosslinked poly(ethylene glycol) (PEG)-silica hydrogels. The addition of silica nanospheres significantly suppresses the hydration degree of the PEG hydrogels, indicating surface interactions between the silica nanospheres and the polymer chains. No significant change in hydrogel microstructure or average pore size due to the addition of silica nanospheres was observed. However, addition of silica nanospheres significantly increases both the mechanical strength and the toughness of the hydrogel networks. The biological properties of these nanocomposite hydrogels were evaluated by seeding fibroblast cells on the hydrogel surface. While the PEG hydrogels showed minimum cell adhesion, spreading and proliferation, the addition of silica nanospheres enhanced initial cell adhesion, promoted cell spreading and increased the metabolic activity of the cells. Overall, results indicate that the addition of silica nanospheres improves the mechanical stiffness and cell adhesion properties of PEG hydrogels and can be used for biomedical applications that required controlled cell adhesion.
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1225
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Miserez A, Guerette PA. Phase transition-induced elasticity of α-helical bioelastomeric fibres and networks. Chem Soc Rev 2013; 42:1973-95. [DOI: 10.1039/c2cs35294j] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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1226
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Mack JJ, Youssef K, Noel ODV, Lake MP, Wu A, Iruela-Arispe ML, Bouchard LS. Real-time maps of fluid flow fields in porous biomaterials. Biomaterials 2012; 34:1980-6. [PMID: 23245922 DOI: 10.1016/j.biomaterials.2012.11.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Accepted: 11/20/2012] [Indexed: 11/19/2022]
Abstract
Mechanical forces such as fluid shear have been shown to enhance cell growth and differentiation, but knowledge of their mechanistic effect on cells is limited because the local flow patterns and associated metrics are not precisely known. Here we present real-time, non-invasive measures of local hydrodynamics in 3D biomaterials based on nuclear magnetic resonance. Microflow maps were further used to derive pressure, shear and fluid permeability fields. Finally, remodeling of collagen gels in response to precise fluid flow parameters was correlated with structural changes. It is anticipated that accurate flow maps within 3D matrices will be a critical step towards understanding cell behavior in response to controlled flow dynamics.
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Affiliation(s)
- Julia J Mack
- Department of Molecular, Cell & Developmental Biology, University of California, Los Angeles, CA 90095, USA
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1227
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Huang J, Hastings CL, Duffy GP, Kelly HM, Raeburn J, Adams DJ, Heise A. Supramolecular Hydrogels with Reverse Thermal Gelation Properties from (Oligo)tyrosine Containing Block Copolymers. Biomacromolecules 2012. [DOI: 10.1021/bm301629f] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Jin Huang
- School of Chemical
Sciences, Dublin City University, Dublin 9, Ireland
| | | | | | | | - Jaclyn Raeburn
- Department of Chemistry, University of Liverpool, Crown Street,
Liverpool, L69 7ZD, United Kingdom
| | - Dave J. Adams
- Department of Chemistry, University of Liverpool, Crown Street,
Liverpool, L69 7ZD, United Kingdom
| | - Andreas Heise
- School of Chemical
Sciences, Dublin City University, Dublin 9, Ireland
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1228
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Liu JS, Gartner ZJ. Directing the assembly of spatially organized multicomponent tissues from the bottom up. Trends Cell Biol 2012; 22:683-91. [PMID: 23067679 PMCID: PMC3505240 DOI: 10.1016/j.tcb.2012.09.004] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 09/02/2012] [Accepted: 09/10/2012] [Indexed: 12/21/2022]
Abstract
The complexity of the human body derives from numerous modular building blocks assembled hierarchically across multiple length scales. These building blocks, spanning sizes ranging from single cells to organs, interact to regulate development and normal organismal function but become disorganized during disease. Here, we review methods for the bottom-up and directed assembly of modular, multicellular, and tissue-like constructs in vitro. These engineered tissues will help refine our understanding of the relationship between form and function in the human body, provide new models for the breakdown in tissue architecture that accompanies disease, and serve as building blocks for the field of regenerative medicine.
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Affiliation(s)
- Jennifer S Liu
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 95108, USA
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1229
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Pawar GM, Koenigs M, Fahimi Z, Cox M, Voets IK, Wyss HM, Sijbesma RP. Injectable Hydrogels from Segmented PEG-Bisurea Copolymers. Biomacromolecules 2012; 13:3966-76. [DOI: 10.1021/bm301242v] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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1230
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Musah S, Morin SA, Wrighton PJ, Zwick DB, Jin S, Kiessling LL. Glycosaminoglycan-binding hydrogels enable mechanical control of human pluripotent stem cell self-renewal. ACS NANO 2012; 6:10168-77. [PMID: 23005914 PMCID: PMC3509190 DOI: 10.1021/nn3039148] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Reaping the promise of human embryonic stem (hES) cells hinges on effective defined culture conditions. Efforts to identify chemically defined environments for hES cell propagation would benefit from understanding the relevant functional properties of the substratum. Biological materials are often employed as substrata, but their complexity obscures a molecular level analysis of their relevant attributes. Because the properties of hydrogels can be tuned and altered systematically, these materials can reveal the impact of substratum features on cell fate decisions. By tailoring the peptide displayed to cells and the substrate mechanical properties, a hydrogel was generated that binds hES cell surface glycosaminoglycans (GAGs) and functions robustly in a defined culture medium to support long-term hES cell self-renewal. A key attribute of the successful GAG-binding hydrogels is their stiffness. Only stiff substrates maintain hES cell proliferation and pluripotency. These findings indicate that cells can respond to mechanical information transmitted via GAG engagement. Additionally, we found that the stiff matrices afforded activation of the paralogous proteins YAP/TAZ, which are transcriptional coactivators implicated in mechanosensing and hES cell pluripotency. These results indicate that the substratum mechanics can be tuned to activate specific pathways linked to pluripotency. Because several different hES and induced pluripotent stem cell lines respond similarly, we conclude that stiff substrata are more effective for the long-term propagation of human pluripotent stem cells.
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Affiliation(s)
- Samira Musah
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Stephen A. Morin
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Paul J. Wrighton
- Department of Biochemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Daniel B. Zwick
- Department of Biochemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Song Jin
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Laura L. Kiessling
- Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
- Department of Biochemistry, University of Wisconsin–Madison, Madison, WI 53706
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1231
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Fuoco C, Salvatori ML, Biondo A, Shapira-Schweitzer K, Santoleri S, Antonini S, Bernardini S, Tedesco FS, Cannata S, Seliktar D, Cossu G, Gargioli C. Injectable polyethylene glycol-fibrinogen hydrogel adjuvant improves survival and differentiation of transplanted mesoangioblasts in acute and chronic skeletal-muscle degeneration. Skelet Muscle 2012; 2:24. [PMID: 23181356 PMCID: PMC3579757 DOI: 10.1186/2044-5040-2-24] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 10/25/2012] [Indexed: 01/03/2023] Open
Abstract
UNLABELLED BACKGROUND Cell-transplantation therapies have attracted attention as treatments for skeletal-muscle disorders; however, such research has been severely limited by poor cell survival. Tissue engineering offers a potential solution to this problem by providing biomaterial adjuvants that improve survival and engraftment of donor cells. METHODS In this study, we investigated the use of intra-muscular transplantation of mesoangioblasts (vessel-associated progenitor cells), delivered with an injectable hydrogel biomaterial directly into the tibialis anterior (TA) muscle of acutely injured or dystrophic mice. The hydrogel cell carrier, made from a polyethylene glycol-fibrinogen (PF) matrix, is polymerized in situ together with mesoangioblasts to form a resorbable cellularized implant. RESULTS Mice treated with PF and mesoangioblasts showed enhanced cell engraftment as a result of increased survival and differentiation compared with the same cell population injected in aqueous saline solution. CONCLUSION Both PF and mesoangioblasts are currently undergoing separate clinical trials: their combined use may increase chances of efficacy for localized disorders of skeletal muscle.
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Affiliation(s)
- Claudia Fuoco
- Department of Biology, Tor Vergata Rome University, Rome, Italy
| | | | - Antonella Biondo
- Division of Regenerative Medicine, San Raffaele Scientific Institute, Milan, Italy
| | | | - Sabrina Santoleri
- Division of Regenerative Medicine, San Raffaele Scientific Institute, Milan, Italy
| | | | | | - Francesco Saverio Tedesco
- Division of Regenerative Medicine, San Raffaele Scientific Institute, Milan, Italy
- Department of Cell and Developmental Biology, UCL, London, UK
| | - Stefano Cannata
- Department of Biology, Tor Vergata Rome University, Rome, Italy
| | - Dror Seliktar
- Faculty of Biomedical Engineering, Technion – Israel Institute of Technology, Haifa, Israel
| | - Giulio Cossu
- Division of Regenerative Medicine, San Raffaele Scientific Institute, Milan, Italy
- Department of Cell and Developmental Biology, UCL, London, UK
| | - Cesare Gargioli
- Department of Biology, Tor Vergata Rome University, Rome, Italy
- IRCCS MultiMedica, Milan, Italy
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1232
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Zustiak SP, Wei Y, Leach JB. Protein-hydrogel interactions in tissue engineering: mechanisms and applications. TISSUE ENGINEERING PART B-REVIEWS 2012; 19:160-71. [PMID: 23150926 DOI: 10.1089/ten.teb.2012.0458] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Recent advances in our understanding of the sophistication of the cellular microenvironment and the dynamics of tissue remodeling during development, disease, and regeneration have increased our appreciation of the current challenges facing tissue engineering. As this appreciation advances, we are better equipped to approach problems in the biology and therapeutics of even more complex fields, such as stem cells and cancer. To aid in these studies, as well as the established areas of tissue engineering, including cardiovascular, musculoskeletal, and neural applications, biomaterials scientists have developed an extensive array of materials with specifically designed chemical, mechanical, and biological properties. Herein, we highlight an important topic within this area of biomaterials research, protein-hydrogel interactions. Due to inherent advantages of hydrated scaffolds for soft tissue engineering as well as specialized bioactivity of proteins and peptides, this field is well-posed to tackle major needs within emerging areas of tissue engineering. We provide an overview of the major modes of interactions between hydrogels and proteins (e.g., weak forces, covalent binding, affinity binding), examples of applications within growth factor delivery and three-dimensional scaffolds, and finally future directions within the area of hydrogel-protein interactions that will advance our ability to control the cell-biomaterial interface.
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Affiliation(s)
- Silviya P Zustiak
- National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
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Abstract
In this report, we detail Substrate Mediated Enzyme Prodrug Therapy (SMEPT) as a novel approach in drug delivery which relies on enzyme-functionalized cell culture substrates to achieve a localized conversion of benign prodrug(s) into active therapeutics with subsequent delivery to adhering cells or adjacent tissues. For proof-of-concept SMEPT, we use surface adhered micro-structured physical hydrogels based on poly(vinyl alcohol), β-glucuronidase enzyme and glucuronide prodrugs. We demonstrate enzymatic activity mediated by the assembled hydrogel samples and illustrate arms of control over rate of release of model fluorescent cargo. SMEPT was not impaired by adhering cells and afforded facile time - and dose - dependent uptake of the in situ generated fluorescent cargo by hepatic cells, HepG2. With the use of a glucuronide derivative of an anticancer drug, SN-38, SMEPT afforded a decrease in cell viability to a level similar to that achieved using parent drug. Finally, dose response was achieved using SMEPT and administration of judiciously chosen concentration of SN-38 glucuronide prodrug thus revealing external control over drug delivery using drug eluting surface. We believe that this highly adaptable concept will find use in diverse biomedical applications, specifically surface mediated drug delivery and tissue engineering.
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Affiliation(s)
| | - Alexander N. Zelikin
- Department of Chemistry, Aarhus University, Aarhus, Denmark
- iNano Interdisciplinary Nanoscience Centre, Aarhus University, Aarhus, Denmark
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1234
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Yang T, Malkoch M, Hult A. Sequential interpenetrating poly(ethylene glycol) hydrogels prepared by UV-initiated thiol-ene coupling chemistry. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26393] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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