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Liu Y, Kim E, Lei M, Wu S, Yan K, Shen J, Bentley WE, Shi X, Qu X, Payne GF. Electro-Biofabrication. Coupling Electrochemical and Biomolecular Methods to Create Functional Bio-Based Hydrogels. Biomacromolecules 2023. [PMID: 37155361 DOI: 10.1021/acs.biomac.3c00132] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Twenty years ago, this journal published a review entitled "Biofabrication with Chitosan" based on the observations that (i) chitosan could be electrodeposited using low voltage electrical inputs (typically less than 5 V) and (ii) the enzyme tyrosinase could be used to graft proteins (via accessible tyrosine residues) to chitosan. Here, we provide a progress report on the coupling of electronic inputs with advanced biological methods for the fabrication of biopolymer-based hydrogel films. In many cases, the initial observations of chitosan's electrodeposition have been extended and generalized: mechanisms have been established for the electrodeposition of various other biological polymers (proteins and polysaccharides), and electrodeposition has been shown to allow the precise control of the hydrogel's emergent microstructure. In addition, the use of biotechnological methods to confer function has been extended from tyrosinase conjugation to the use of protein engineering to create genetically fused assembly tags (short sequences of accessible amino acid residues) that facilitate the attachment of function-conferring proteins to electrodeposited films using alternative enzymes (e.g., transglutaminase), metal chelation, and electrochemically induced oxidative mechanisms. Over these 20 years, the contributions from numerous groups have also identified exciting opportunities. First, electrochemistry provides unique capabilities to impose chemical and electrical cues that can induce assembly while controlling the emergent microstructure. Second, it is clear that the detailed mechanisms of biopolymer self-assembly (i.e., chitosan gel formation) are far more complex than anticipated, and this provides a rich opportunity both for fundamental inquiry and for the creation of high performance and sustainable material systems. Third, the mild conditions used for electrodeposition allow cells to be co-deposited for the fabrication of living materials. Finally, the applications have been expanded from biosensing and lab-on-a-chip systems to bioelectronic and medical materials. We suggest that electro-biofabrication is poised to emerge as an enabling additive manufacturing method especially suited for life science applications and to bridge communication between our biological and technological worlds.
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Affiliation(s)
- Yi Liu
- Institute for Bioscience and Biotechnology Research and Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, Maryland 20742, United States
| | - Eunkyoung Kim
- Institute for Bioscience and Biotechnology Research and Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, Maryland 20742, United States
| | - Miao Lei
- Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell Metabolism, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Si Wu
- College of Resources and Environmental Engineering, Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
| | - Kun Yan
- Hubei Key Laboratory of Advanced Textile Materials & Application, Wuhan Textile University, Wuhan 430200, P. R. China
| | - Jana Shen
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, Maryland 21201, United States
| | - William E Bentley
- Institute for Bioscience and Biotechnology Research and Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, Maryland 20742, United States
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Xiaowen Shi
- School of Resource and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Engineering Center of Natural Polymers-Based Medical Materials, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, P. R. China
| | - Xue Qu
- Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell Metabolism, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Gregory F Payne
- Institute for Bioscience and Biotechnology Research and Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, Maryland 20742, United States
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Nordin N, Bordonali L, Davoodi H, Ratnawati ND, Gygli G, Korvink JG, Badilita V, MacKinnon N. Real‐Time NMR Monitoring of Spatially Segregated Enzymatic Reactions in Multilayered Hydrogel Assemblies**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Nurdiana Nordin
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
- Department of Chemistry Faculty of Science University of Malaya Kuala Lumpur Malaysia
| | - Lorenzo Bordonali
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
| | - Hossein Davoodi
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
| | - Novindi Dwi Ratnawati
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
| | - Gudrun Gygli
- Institute of Biological Interfaces-1 Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
| | - Jan G. Korvink
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
| | - Vlad Badilita
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
| | - Neil MacKinnon
- Institute of Microstructure Technology Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany
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Nordin N, Bordonali L, Davoodi H, Ratnawati ND, Gygli G, Korvink JG, Badilita V, MacKinnon N. Real-Time NMR Monitoring of Spatially Segregated Enzymatic Reactions in Multilayered Hydrogel Assemblies*. Angew Chem Int Ed Engl 2021; 60:19176-19182. [PMID: 34132012 PMCID: PMC8457052 DOI: 10.1002/anie.202103585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 05/11/2021] [Indexed: 11/16/2022]
Abstract
Compartmentalized chemical reactions at the microscale are important in biotechnology, yet monitoring the molecular content at these small scales is challenging. To address this challenge, we integrate a compact, reconfigurable reaction cell featuring electrochemical functionality with high‐resolution NMR spectroscopy. We demonstrate the operation of this system by monitoring the activity of enzymes immobilized in chemically distinct layers within a multi‐layered chitosan hydrogel assembly. As a benchmark, we observed the parallel activities of urease (Urs), catalase (Cat), and glucose oxidase (GOx) by monitoring reagent and product concentrations in real‐time. Simultaneous monitoring of an independent enzymatic process (Urs) together with a cooperative process (GOx + Cat) was achieved, with chemical conversion modulation of the GOx + Cat process demonstrated by varying the order in which the hydrogel was assembled.
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Affiliation(s)
- Nurdiana Nordin
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany.,Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Lorenzo Bordonali
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Hossein Davoodi
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Novindi Dwi Ratnawati
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Gudrun Gygli
- Institute of Biological Interfaces-1, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Jan G Korvink
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Vlad Badilita
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Neil MacKinnon
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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MPH-GST sensing microplate for easy detection of organophosphate insecticides. Biotechnol Lett 2021; 43:933-944. [PMID: 33512614 DOI: 10.1007/s10529-021-03078-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 01/06/2021] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To develop a convenient and efficient means for organophosphate (OP) insecticide detection, a simple, cost-effective, and easy-to-use absorbance-based sensing device was generated using methyl parathion hydrolase fused with glutathione-S-transferase (MPH-GST) covalently immobilized onto a chitosan film-coated microplate. RESULTS With methyl parathion (MP) as a representative substrate, this MPH-GST sensing microplate had the detection limit of 0.1 µM and the linear range of 0.1-50 µM. Despite its highest stability at 4 °C, it was considerably stable at 25 °C with high activity for 30 days. It was also most stable at pH 8.0 and could be efficiently reused up to 100 rounds. The device revealed a high percentage of recovery for tap water spiked with a known concentration of MP, which was also comparable to the result obtained from gas chromatography-mass spectrometry. It also showed a high recovery of 82-100% with MP spiked agricultural products and satisfactory results with non-spiked samples. This immobilized enzyme sensing system was more sensitive and efficient than the whole cell system from our previous work. CONCLUSIONS All of the advantages of the MPH-GST sensing microplate developed have rendered it suitable for rapid and convenient OP screening, and for being a bio-element for fabricating a potential optical biosensor in the future.
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Maerten C, Jierry L, Schaaf P, Boulmedais F. Review of Electrochemically Triggered Macromolecular Film Buildup Processes and Their Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28117-28138. [PMID: 28762716 DOI: 10.1021/acsami.7b06319] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Macromolecular coatings play an important role in many technological areas, ranging from the car industry to biosensors. Among the different coating technologies, electrochemically triggered processes are extremely powerful because they allow in particular spatial confinement of the film buildup up to the micrometer scale on microelectrodes. Here, we review the latest advances in the field of electrochemically triggered macromolecular film buildup processes performed in aqueous solutions. All these processes will be discussed and related to their several applications such as corrosion prevention, biosensors, antimicrobial coatings, drug-release, barrier properties and cell encapsulation. Special emphasis will be put on applications in the rapidly growing field of biosensors. Using polymers or proteins, the electrochemical buildup of the films can result from a local change of macromolecules solubility, self-assembly of polyelectrolytes through electrostatic/ionic interactions or covalent cross-linking between different macromolecules. The assembly process can be in one step or performed step-by-step based on an electrical trigger affecting directly the interacting macromolecules or generating ionic species.
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Affiliation(s)
- Clément Maerten
- Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22 , 23 rue du Loess, F-67034 Strasbourg Cedex, France
| | - Loïc Jierry
- Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22 , 23 rue du Loess, F-67034 Strasbourg Cedex, France
| | - Pierre Schaaf
- Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22 , 23 rue du Loess, F-67034 Strasbourg Cedex, France
- INSERM, Unité 1121 "Biomaterials and Bioengineering" , 11 rue Humann, F-67085 Strasbourg Cedex, France
- Faculté de Chirurgie Dentaire, Fédération de Médecine Translationnelle de Strasbourg (FMTS), and Fédération des Matériaux et Nanoscience d'Alsace (FMNA), Université de Strasbourg , 8 rue Sainte Elisabeth, F-67000 Strasbourg, France
- University of Strasbourg Institute for Advanced Study , 5 allée du Général Rouvillois, F-67083 Strasbourg, France
| | - Fouzia Boulmedais
- Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22 , 23 rue du Loess, F-67034 Strasbourg Cedex, France
- University of Strasbourg Institute for Advanced Study , 5 allée du Général Rouvillois, F-67083 Strasbourg, France
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Jampasa S, Wonsawat W, Rodthongkum N, Siangproh W, Yanatatsaneejit P, Vilaivan T, Chailapakul O. Electrochemical detection of human papillomavirus DNA type 16 using a pyrrolidinyl peptide nucleic acid probe immobilized on screen-printed carbon electrodes. Biosens Bioelectron 2013; 54:428-34. [PMID: 24300785 DOI: 10.1016/j.bios.2013.11.023] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 10/30/2013] [Accepted: 11/06/2013] [Indexed: 11/25/2022]
Abstract
An electrochemical biosensor based on an immobilized anthraquinone-labeled pyrrolidinyl peptide nucleic acid (acpcPNA) probe was successfully developed for the selective detection of human papillomavirus (HPV) type 16 DNA. A 14-mer acpcPNA capture probe was designed to recognize a specific 14 nucleotide region of HPV type 16 L1 gene. The redox-active label anthraquinone (AQ) was covalently attached to the N-terminus of the acpcPNA probe through an amide bond. The probe was immobilized onto a chitosan-modified disposable screen-printed carbon electrode via a C-terminal lysine residue using glutaraldehyde as a cross-linking agent. Hybridization with the target DNA was studied by measuring the electrochemical signal response of the AQ label using square-wave voltammetric analysis. The calibration curve exhibited a linear range between 0.02 and 12.0 µM with a limit of detection and limit of quantitation of 4 and 14 nM, respectively. This DNA sensing platform was successfully applied to detect the HPV type 16 DNA from a PCR amplified (240 bp fragment of the L1 gene) sample derived from the HPV type 16 positive human cancer cell line (SiHa), and failed to detect the HPV-negative c33a cell line. The sensor probe exhibited very high selectivity for the complementary 14 base oligonucleotide over the non-complementary oligonucleotides with sequences derived from HPV types 18, 31 and 33. The proposed sensor provides an inexpensive tool for the early stage detection of HPV type 16, which is an important biomarker for cervical cancer.
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Affiliation(s)
- Sakda Jampasa
- Program in Petrochemical and Polymer Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
| | - Wanida Wonsawat
- Department of Chemistry, Faculty of Science and Technology, Suan Sunandha Rajabhat University, 1 U-Thong Nok Road, Dusit, Bangkok 10300, Thailand
| | - Nadnudda Rodthongkum
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
| | - Weena Siangproh
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Bangkok, Thailand
| | - Pattamawadee Yanatatsaneejit
- Human Genetics Research Group, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Tirayut Vilaivan
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
| | - Orawon Chailapakul
- Electrochemistry and Optical Spectroscopy Research Unit, Department of Chemistry, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand.
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Golova JB, Chernov BK, Perov AN, Reynolds J, Linger YL, Kukhtin A, Chandler DP. Nonvolatile copolymer compositions for fabricating gel element microarrays. Anal Biochem 2011; 421:526-33. [PMID: 22033291 DOI: 10.1016/j.ab.2011.09.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 09/27/2011] [Accepted: 09/28/2011] [Indexed: 11/28/2022]
Abstract
By modifying polymer compositions and cross-linking reagents, we have developed a simple yet effective manufacturing strategy for copolymerized three-dimensional gel element arrays. A new gel-forming monomer, 2-(hydroxyethyl) methacrylamide (HEMAA), was used. HEMAA possesses low volatility and improves the stability of copolymerized gel element arrays to on-chip thermal cycling procedures relative to previously used monomers. Probe immobilization efficiency within the new polymer was 55%, equivalent to that obtained with acrylamide (AA) and methacrylamide (MA) monomers. Nonspecific binding of single-stranded targets was equivalent for all monomers. Increasing cross-linker chain length improved hybridization kinetics and end-point signal intensities relative to N,N-methylenebisacrylamide (Bis). The new copolymer formulation was successfully applied to a model orthopox array. Because HEMAA greatly simplifies gel element array manufacture, we expect it (in combination with new cross-linkers described here) to find widespread application in microarray science.
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Zhang Y, Li L, Yu C, Hei T. Chitosan-coated polystyrene microplate for covalent immobilization of enzyme. Anal Bioanal Chem 2011; 401:2311-7. [PMID: 21842444 DOI: 10.1007/s00216-011-5306-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 07/24/2011] [Accepted: 08/01/2011] [Indexed: 11/30/2022]
Abstract
Microplates made of polystyrene have been widely used for immunoassays. Protein molecules that have been immobilized on a hydrophobic polystyrene microplate by passive adsorption lose their activity and suffer considerable denaturation. A new chitosan-coated microplate suitable for the covalent immobilization of enzymes has been developed. The primary amino groups of chitosan were exploited for this covalent coupling of proteins. The optical transmittance of the chitosan-coated microplate, at wavelengths of 400-800 nm, was estimated to be suitable for its application in chromogenic reaction-based bioassays. The immobilization efficiency of the chitosan-coated microplate was demonstrated to be far superior to that of a conventional microplate when tested using acetylcholinesterase (AChE) and β-glucosidase as model biomolecules, and the chitosan-coated microplate may thus have potential applications in biosensing and bioreactor systems.
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Affiliation(s)
- Yaodong Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, China.
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Koev ST, Dykstra PH, Luo X, Rubloff GW, Bentley WE, Payne GF, Ghodssi R. Chitosan: an integrative biomaterial for lab-on-a-chip devices. LAB ON A CHIP 2010; 10:3026-3042. [PMID: 20877781 DOI: 10.1039/c0lc00047g] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Chitosan is a naturally derived polymer with applications in a variety of industrial and biomedical fields. Recently, it has emerged as a promising material for biological functionalization of microelectromechanical systems (bioMEMS). Due to its unique chemical properties and film forming ability, chitosan serves as a matrix for the assembly of biomolecules, cells, nanoparticles, and other substances. The addition of these components to bioMEMS devices enables them to perform functions such as specific biorecognition, enzymatic catalysis, and controlled drug release. The chitosan film can be integrated in the device by several methods compatible with standard microfabrication technology, including solution casting, spin casting, electrodeposition, and nanoimprinting. This article surveys the usage of chitosan in bioMEMS to date. We discuss the common methods for fabrication, modification, and characterization of chitosan films, and we review a number of demonstrated chitosan-based microdevices. We also highlight the advantages of chitosan over some other functionalization materials for micro-scale devices.
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Affiliation(s)
- S T Koev
- Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA
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Self-assembly and Fractal Feature of Chitosan and Its Conjugate with Metal Ions: Cu (II) / Ag (I). Int J Mol Sci 2007. [DOI: 10.3390/i8010001] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Wischke C, Borchert HH, Zimmermann J, Siebenbrodt I, Lorenzen DR. Stable cationic microparticles for enhanced model antigen delivery to dendritic cells. J Control Release 2006; 114:359-68. [PMID: 16889866 DOI: 10.1016/j.jconrel.2006.06.020] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 06/13/2006] [Accepted: 06/19/2006] [Indexed: 11/29/2022]
Abstract
The objectives of this work were (i) to prepare physically stable cationic microparticles and (ii) to study the impact of the surface properties on microparticle phagocytosis and the phenotype of dendritic cells (DC). Protein loaded biodegradable microparticles from poly(lactic-co-glycolic acid) [PLGA] were produced in a micromixer-based w/o/w solvent evaporation procedure. Anionic particles were obtained by using polyvinyl alcohol (PVA) as stabilizing agent; for cationic surfaces cetyltrimethylammonium bromide (CTAB) and chitosan/PVA or DEAE-dextran/PVA blends were evaluated. In phagocytosis studies human monocytes and monocyte-derived DC were incubated with microparticles and analysed by flow cytometry. While CTAB modified microparticles lost their positive charge and aggregated due to CTAB desorption from the particle surface, the modification with chitosan and DEAE-dextran resulted in stable microparticles without cell toxicity. Due to a very low endotoxin content, phagocytosis of anionic and cationic microparticles did not induce an upregulation of maturation-associated surface markers on DC. DEAE-dextran modified microparticles showed an enhanced model protein delivery into phagocytic cells. Overall, PLGA microparticles are suitable vehicles for protein delivery to DC, which might be used for DC-based cell therapies.
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Affiliation(s)
- Christian Wischke
- Department of Pharmacy, Free University of Berlin, Kelchstrasse 31, D-12169 Berlin, Germany
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14
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Soto CM, Patterson CH, Charles PT, Martin BD, Spector MS. Immobilization and hybridization of DNA in a sugar polyacrylate hydrogel. Biotechnol Bioeng 2006; 92:934-42. [PMID: 16155955 DOI: 10.1002/bit.20665] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Using a non-contact microarrayer, amine-terminated probe oligonucleotides representing 20-, 50-, and 70-mer fragments of the fliC gene were covalently coupled into three-dimensional regions in a "sugar polyacrylate" hydrogel based on poly(6-acryloyl-beta-O-methyl galactopyranoside-co-aminopropyl methacrylamide). The arrayer deposited the solution containing ssDNA probes in discrete regions on the surface of the gel (i.e. as a droplet with a ca. 450 microm diameter), allowing penetration and attachment of the ss DNA within the three dimensional region of the gel. The attachment was mediated by the homobifunctional crosslinker bis-succinimidyl suberate. Confocal microscopy showed the density of attached probe DNA was greatest in the interior-most regions of the gel volume. Target ssDNA (20- and 70-mer) was able to diffuse through the gel and undergo successful hybridization with the probes. For target ssDNA in the concentration range 0.19 microM to 6.0 microM, there was a linear correlation between DNA concentration and the fluorescence of the gel region where hybridization occurred.
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Affiliation(s)
- Carissa M Soto
- Naval Research Laboratory, Center for Bio/Molecular Science and Engineering, 4555 Overlook Ave. SW, Washington, DC 20375, USA.
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Thein-Han WW, Kitiyanant Y. Chitosan scaffolds forin vitro buffalo embryonic stem-like cell culture: An approach to tissue engineering. J Biomed Mater Res B Appl Biomater 2006; 80:92-101. [PMID: 16767733 DOI: 10.1002/jbm.b.30573] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Three-dimensional (3D) porous chitosan scaffolds are attractive candidates for tissue engineering applications. Chitosan scaffolds of 70, 88, and 95% degree of deacetylation (% DD) with the same molecular weight were developed and their properties with buffalo embryonic stem-like (ES-like) cells were investigated in vitro. Scaffolds were fabricated by freezing and lyophilization. They showed open pore structure with interconnecting pores under scanning electron microscopy (SEM). Higher % DD chitosan scaffolds had greater mechanical strength, slower degradation rate, lower water uptake ability, but similar water retention ability, when compared to lower % DD chitosan. As a strategy to tissue engineering, buffalo ES-like cells were cultured on scaffolds for 28 days. It appeared that chitosan was cytocompatible and cells proliferated well on 88 and 95% DD scaffolds. In addition, the buffalo ES-like cells maintained their pluripotency during the culture period. Furthermore, the SEM and histological study showed that the polygonal buffalo ES-like cells proliferated well and attached to the pores. This study proved that 3D biodegradable highly deacetylated chitosan scaffolds are promising candidates for ES-like cell based tissue engineering and this chitosan scaffold and ES cell based system can be used as in vitro model for subsequent clinical applications.
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Affiliation(s)
- Wah W Thein-Han
- Institute of Science and Technology for Research and Development, Mahidol University, Salaya Campus, Nakhorn Pathom 73170, Thailand
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Lewandowski AT, Small DA, Chen T, Payne GF, Bentley WE. Tyrosine-based “Activatable Pro-Tag”: Enzyme-catalyzed protein capture and release. Biotechnol Bioeng 2006; 93:1207-15. [PMID: 16506245 DOI: 10.1002/bit.20840] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Protein recovery is often achieved by a series of capture and release steps that often involve chromatographic binding and elution. We report an alternative, non-chromatographic, capture and release approach that employs enzymes and the stimuli-responsive polysaccharide chitosan. We capture our protein using the enzyme tyrosinase that oxidizes accessible tyrosine residues of the protein and "activates" these residues for covalent capture (i.e., conjugation) onto chitosan. Using fusions of green fluorescent protein (GFP) we observed that: (i) enzymatic activation is required for protein capture to chitosan; and (ii) capture is enhanced (approximately five-fold) by engineering the protein to have a penta-tyrosine fusion tag that provides additional accessible tyrosine residues for enzymatic activation. Because the fusion tag appears to be the primary site for capture, and capture requires activation, we designate penta-tyrosine as a "pro-tag." The captured GFP-chitosan conjugate possesses the pH-responsive solubility that is characteristic of chitosan. We exploit this pH-responsive solubility to facilitate purification of the captured protein. Two enzymatic methods were explored to release the captured GFP from the chitosan conjugate. The first method employs enterokinase (EK) to cleave the protein at an engineered EK-cleavage site. The second method employs chitosanase to hydrolyze the chitosan backbone. Using GFP as a model protein, we demonstrated that enzymatic capture and release provides a simple, non-chromatographic means to recover proteins directly from cell lysates.
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Affiliation(s)
- Angela T Lewandowski
- Center for Biosystems Research, University of Maryland Biotechnology Institute, 5115 Plant Sciences Building, College Park, Maryland 20742, USA
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del Campo A, Bruce IJ. Substrate Patterning and Activation Strategies for DNA Chip Fabrication. Top Curr Chem (Cham) 2005. [DOI: 10.1007/b137073] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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