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Griveau L, Lafont M, le Goff H, Drouglazet C, Robbiani B, Berthier A, Sigaudo-Roussel D, Latif N, Visage CL, Gache V, Debret R, Weiss P, Sohier J. Design and characterization of an in vivo injectable hydrogel with effervescently generated porosity for regenerative medicine applications. Acta Biomater 2022; 140:324-337. [PMID: 34843951 DOI: 10.1016/j.actbio.2021.11.036] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 11/20/2021] [Accepted: 11/23/2021] [Indexed: 12/20/2022]
Abstract
Injectable hydrogels that polymerize directly in vivo hold significant promises in clinical settings to support the repair of damaged or failing tissues. Existing systems that allow cellular and tissue ingrowth after injection are limited because of deficient porosity and lack of oxygen and nutrient diffusion inside the hydrogels. Here is reported for the first time an in vivo injectable hydrogel in which the porosity does not pre-exist but is formed concomitantly with its in situ injection by a controlled effervescent reaction. The hydrogel tailorable crosslinking, through the reaction of polyethylene glycol with lysine dendrimers, allows the mixing and injection of precursor solutions from a dual-chamber syringe while entrapping effervescently generated CO2 bubbles to form highly interconnected porous networks. The resulting structures allow preserving modular mechanical properties (from 12.7 ± 0.9 to 29.9 ± 1.7 kPa) while being cytocompatible and conducive to swift cellular attachment, proliferation, in-depth infiltration and extracellular matrix deposition. Most importantly, the subcutaneously injected porous hydrogels are biocompatible, undergo tissue remodeling and support extensive neovascularisation, which is of significant advantage for the clinical repair of damaged tissues. Thus, the porosity and injectability of the described effervescent hydrogels, together with their biocompatibility and versatility of mechanical properties, open broad perspectives for various regenerative medicine or material applications, since effervescence could be combined with a variety of other systems of swift crosslinking. STATEMENT OF SIGNIFICANCE: A major challenge in hydrogel design is the synthesis of injectable formulations allowing easy handling and dispensing in the site of interest. However, the lack of adequate porosity inside hydrogels prevent cellular entry and, therefore, vascularization and tissue ingrowth, limiting the regenerative potential of a vast majority of injectable hydrogels. We describe here the development of an acellular hydrogel that can be injected directly in situ while allowing the simultaneous formation of porosity. Such hydrogel would facilitate handling through injection while providing a porous structure supporting vascularization and tissue ingrowth.
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Affiliation(s)
- Louise Griveau
- Laboratory for tissue biology and therapeutic engineering (LBTI), CNRS, Université de Lyon, UMR 5305, 7 Passage du Vercors, Lyon cedex 7 69367, France
| | - Marianne Lafont
- Université de Nantes, Oniris, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, Nantes F-44000, France
| | - Héloïse le Goff
- Université de Lyon, INSA-Lyon, MATEIS, UMR CNRS 5510-7 avenue Jean Capelle, F-69621, Villeurbanne, France
| | - Clémence Drouglazet
- Université de Lyon, INSA-Lyon, MATEIS, UMR CNRS 5510-7 avenue Jean Capelle, F-69621, Villeurbanne, France
| | - Baptiste Robbiani
- Université de Lyon, INSA-Lyon, MATEIS, UMR CNRS 5510-7 avenue Jean Capelle, F-69621, Villeurbanne, France
| | - Aurore Berthier
- Laboratory for tissue biology and therapeutic engineering (LBTI), CNRS, Université de Lyon, UMR 5305, 7 Passage du Vercors, Lyon cedex 7 69367, France
| | - Dominique Sigaudo-Roussel
- Laboratory for tissue biology and therapeutic engineering (LBTI), CNRS, Université de Lyon, UMR 5305, 7 Passage du Vercors, Lyon cedex 7 69367, France
| | - Najma Latif
- Imperial College London, Heart Science Centre, Harefield Hospital, Harefield, Middlesex UB9 6JH, UK
| | - Catherine Le Visage
- Université de Nantes, Oniris, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, Nantes F-44000, France
| | - Vincent Gache
- Institut NeuroMyogène (INMG), Muscle Nuclear and Cytoskeleton Architecture (MNCA), CNRS UMR 5310-INSERM U1217-UCBL1-Université de Lyon, 8 avenue Rockefeller, Lyon 69008. France
| | - Romain Debret
- Laboratory for tissue biology and therapeutic engineering (LBTI), CNRS, Université de Lyon, UMR 5305, 7 Passage du Vercors, Lyon cedex 7 69367, France
| | - Pierre Weiss
- Université de Nantes, Oniris, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, Nantes F-44000, France
| | - Jérôme Sohier
- Laboratory for tissue biology and therapeutic engineering (LBTI), CNRS, Université de Lyon, UMR 5305, 7 Passage du Vercors, Lyon cedex 7 69367, France.
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In Situ Measurement Methods for the CO 2-Induced Gelation of Biopolymer Systems. Gels 2020; 6:gels6030028. [PMID: 32916912 PMCID: PMC7559909 DOI: 10.3390/gels6030028] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 11/17/2022] Open
Abstract
This work presents two novel methods to investigate in situ the carbon dioxide (CO2)-induced gelation of biopolymer-based solutions. The CO2-induced gelation is performed in a viewing cell at room temperature under CO2 pressure (20 to 60 bar), whereby calcium precursors are used as cross-linkers. The novel methods allow the in situ optical observation and evaluation of the gelation process via the change in turbidity due to dissolution of dispersed calcium carbonate (CaCO3) particles and in situ pH measurements. The combination of both methods enables the determination of the gelation direction, gelation rate, and the pH value in spatial and temporal resolution. The optical gelation front and pH front both propagate equally from top to bottom through the sample solutions, indicating a direct link between a decrease in the pH value and the dissolution of the CaCO3 particles. Close-to-vertical movement of both gelation front and pH front suggests almost one dimensional diffusion of CO2 from the contact surface (gel–CO2) to the bottom of the sample. The gelation rate increases with the increase in CO2 pressure. However, the increase in solution viscosity and the formation of a gel layer result in a strong decrease in the gelation rate due to a hindrance of CO2 diffusion. Released carbonate ions from CaCO3 dissolution directly influence the reaction equilibrium between CO2 and water and therefore the change in pH value of the solution. Increasing the CaCO3 concentrations up to the solubility results in lower gelation rates.
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Quintanilla-Sierra L, García-Arévalo C, Rodriguez-Cabello J. Self-assembly in elastin-like recombinamers: a mechanism to mimic natural complexity. Mater Today Bio 2019; 2:100007. [PMID: 32159144 PMCID: PMC7061623 DOI: 10.1016/j.mtbio.2019.100007] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/10/2019] [Accepted: 05/13/2019] [Indexed: 12/19/2022] Open
Abstract
The topic of self-assembled structures based on elastin-like recombinamers (ELRs, i.e., elastin-like polymers recombinantly bio-produced) has released a noticeable amount of references in the last few years. Most of them are intended for biomedical applications. In this review, a complete revision of the bibliography is carried out. Initially, the self-assembly (SA) concept is considered from a general point of view, and then ELRs are described and characterized based on their intrinsic disorder. A classification of the different self-assembled ELR-based structures is proposed based on their morphologies, paying special attention to their tentative modeling. The impact of the mechanism of SA on these biomaterials is analyzed. Finally, the implications of ELR SA in biological systems are considered.
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Affiliation(s)
| | | | - J.C. Rodriguez-Cabello
- BIOFORGE (Group for Advanced Materials and Nanobiotechnology), CIBER-BBN, University of Valladolid, 47011, Valladolid, Spain
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Annabi N, Zhang YN, Assmann A, Sani ES, Cheng G, Lassaletta AD, Vegh A, Dehghani B, Ruiz-Esparza GU, Wang X, Gangadharan S, Weiss AS, Khademhosseini A. Engineering a highly elastic human protein-based sealant for surgical applications. Sci Transl Med 2017; 9:eaai7466. [PMID: 28978753 PMCID: PMC11186511 DOI: 10.1126/scitranslmed.aai7466] [Citation(s) in RCA: 194] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 05/11/2017] [Accepted: 08/17/2017] [Indexed: 04/28/2024]
Abstract
Surgical sealants have been used for sealing or reconnecting ruptured tissues but often have low adhesion, inappropriate mechanical strength, cytotoxicity concerns, and poor performance in biological environments. To address these challenges, we engineered a biocompatible and highly elastic hydrogel sealant with tunable adhesion properties by photocrosslinking the recombinant human protein tropoelastin. The subcutaneous implantation of the methacryloyl-substituted tropoelastin (MeTro) sealant in rodents demonstrated low toxicity and controlled degradation. All animals survived surgical procedures with adequate blood circulation by using MeTro in an incisional model of artery sealing in rats, and animals showed normal breathing and lung function in a model of surgically induced rat lung leakage. In vivo experiments in a porcine model demonstrated complete sealing of severely leaking lung tissue in the absence of sutures or staples, with no clinical or sonographic signs of pneumothorax during 14 days of follow-up. The engineered MeTro sealant has high potential for clinical applications because of superior adhesion and mechanical properties compared to commercially available sealants, as well as opportunity for further optimization of the degradation rate to fit desired surgical applications on different tissues.
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Affiliation(s)
- Nasim Annabi
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115-5000, USA.
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Yi-Nan Zhang
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Alexander Assmann
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
- Department of Cardiovascular Surgery and Research Group for Experimental Surgery, Heinrich Heine University, Medical Faculty, Duesseldorf 40225, Germany
| | - Ehsan Shirzaei Sani
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115-5000, USA
| | - George Cheng
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Antonio D Lassaletta
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Andrea Vegh
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Bijan Dehghani
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Guillermo U Ruiz-Esparza
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Xichi Wang
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Sidhu Gangadharan
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Anthony S Weiss
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
- Bosch Institute, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Ali Khademhosseini
- Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA.
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
- Department of Physics, King Abdulaziz University, Jeddah 21569, Saudi Arabia
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Kankala RK, Zhang YS, Wang SB, Lee CH, Chen AZ. Supercritical Fluid Technology: An Emphasis on Drug Delivery and Related Biomedical Applications. Adv Healthc Mater 2017; 6:10.1002/adhm.201700433. [PMID: 28752598 PMCID: PMC5849475 DOI: 10.1002/adhm.201700433] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/12/2017] [Indexed: 12/18/2022]
Abstract
During the past few decades, supercritical fluid (SCF) has emerged as an effective alternative for many traditional pharmaceutical manufacturing processes. Operating active pharmaceutical ingredients (APIs) alone or in combination with various biodegradable polymeric carriers in high-pressure conditions provides enhanced features with respect to their physical properties such as bioavailability enhancement, is of relevance to the application of SCF in the pharmaceutical industry. Herein, recent advances in drug delivery systems manufactured using the SCF technology are reviewed. We provide a brief description of the history, principle, and various preparation methods involved in the SCF technology. Next, we aim to give a brief overview, which provides an emphasis and discussion of recent reports using supercritical carbon dioxide (SC-CO2 ) for fabrication of polymeric carriers, for applications in areas related to drug delivery, tissue engineering, bio-imaging, and other biomedical applications. We finally summarize with perspectives.
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Affiliation(s)
- Ranjith Kumar Kankala
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, P. R. China
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, 361021, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Xiamen, 361021, P. R. China
| | - Yu Shrike Zhang
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
| | - Shi-Bin Wang
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, P. R. China
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, 361021, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Xiamen, 361021, P. R. China
| | - Chia-Hung Lee
- Department of Life Science and Institute of Biotechnology, National Dong Hwa University, Hualien, 97401, Taiwan
| | - Ai-Zheng Chen
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, P. R. China
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, 361021, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Xiamen, 361021, P. R. China
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA
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Yeo GC, Aghaei-Ghareh-Bolagh B, Brackenreg EP, Hiob MA, Lee P, Weiss AS. Fabricated Elastin. Adv Healthc Mater 2015; 4:2530-2556. [PMID: 25771993 PMCID: PMC4568180 DOI: 10.1002/adhm.201400781] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 02/09/2015] [Indexed: 12/18/2022]
Abstract
The mechanical stability, elasticity, inherent bioactivity, and self-assembly properties of elastin make it a highly attractive candidate for the fabrication of versatile biomaterials. The ability to engineer specific peptide sequences derived from elastin allows the precise control of these physicochemical and organizational characteristics, and further broadens the diversity of elastin-based applications. Elastin and elastin-like peptides can also be modified or blended with other natural or synthetic moieties, including peptides, proteins, polysaccharides, and polymers, to augment existing capabilities or confer additional architectural and biofunctional features to compositionally pure materials. Elastin and elastin-based composites have been subjected to diverse fabrication processes, including heating, electrospinning, wet spinning, solvent casting, freeze-drying, and cross-linking, for the manufacture of particles, fibers, gels, tubes, sheets and films. The resulting materials can be tailored to possess specific strength, elasticity, morphology, topography, porosity, wettability, surface charge, and bioactivity. This extraordinary tunability of elastin-based constructs enables their use in a range of biomedical and tissue engineering applications such as targeted drug delivery, cell encapsulation, vascular repair, nerve regeneration, wound healing, and dermal, cartilage, bone, and dental replacement.
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Affiliation(s)
- Giselle C. Yeo
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Behnaz Aghaei-Ghareh-Bolagh
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Edwin P. Brackenreg
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Matti A. Hiob
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Pearl Lee
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Anthony S. Weiss
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
- Bosch Institute, The University of Sydney, NSW 2006, Australia
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Gabrienko AA, Subramani V, Martyanov ON, Kazarian SG. Correlation between Asphaltene Stability in n-Heptane and Crude Oil Composition Revealed with In Situ Chemical Imaging. ADSORPT SCI TECHNOL 2014. [DOI: 10.1260/0263-6174.32.4.243] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- Anton A. Gabrienko
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - Velu Subramani
- BP Products North America, Inc. Refining and Logistics Technology, Naperville, IL 60563, USA
| | - Oleg N. Martyanov
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russian Federation
| | - Sergei G. Kazarian
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
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8
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Kazarian SG, Chan KLA. ATR-FTIR spectroscopic imaging: recent advances and applications to biological systems. Analyst 2013; 138:1940-51. [DOI: 10.1039/c3an36865c] [Citation(s) in RCA: 267] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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9
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Floren ML, Spilimbergo S, Motta A, Migliaresi C. Carbon dioxide induced silk protein gelation for biomedical applications. Biomacromolecules 2012; 13:2060-72. [PMID: 22657735 DOI: 10.1021/bm300450a] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a novel method to fabricate silk fibroin hydrogels using high pressure carbon dioxide (CO(2)) as a volatile acid without the need for chemical cross-linking agents or surfactants. The simple and efficient recovery of CO(2) post processing results in a remarkably clean production method offering tremendous benefit toward materials processing for biomedical applications. Further, with this novel technique we reveal that silk protein gelation can be considerably expedited under high pressure CO(2) with the formation of extensive β-sheet structures and stable hydrogels at processing times less than 2 h. We report a significant influence of the high pressure CO(2) processing environment on silk hydrogel physical properties such as porosity, sample homogeneity, swelling behavior and compressive properties. Microstructural analysis revealed improved porosity and homogeneous composition among high pressure CO(2) specimens in comparison to the less porous and heterogeneous structures of the citric acid control gels. The swelling ratios of silk hydrogels prepared under high pressure CO(2) were significantly reduced compared to the citric acid control gels, which we attribute to enhanced physical cross-linking. Mechanical properties were found to increase significantly for the silk hydrogels prepared under high pressure CO(2), with a 2- and 3-fold increase in the compressive modulus of the 2 and 4 wt % silk hydrogels over the control gels, respectively. We adopted a semiempirical theoretical model to elucidate the mechanism of silk protein gelation demonstrated here. Mechanistically, the rate of silk protein gelation is believed to be a function of the kinetics of solution acidification from absorbed CO(2) and potentially accelerated by high pressure effects. The attractive features of the method described here include the acceleration of stable silk hydrogel formation, free of residual mineral acids or chemical cross-linkers, reducing processing complexity, and avoiding adverse biological responses, while providing direct manipulation of hydrogel physical properties for tailoring toward specific biomedical applications.
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Affiliation(s)
- Michael L Floren
- Department of Materials Engineering and Industrial Technologies, University of Trento, Mattarello, 38123 Italy.
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10
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Annabi N, Fathi A, Mithieux SM, Weiss AS, Dehghani F. Fabrication of porous PCL/elastin composite scaffolds for tissue engineering applications. J Supercrit Fluids 2011. [DOI: 10.1016/j.supflu.2011.06.010] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Fabrication of porous chitosan scaffolds for soft tissue engineering using dense gas CO2. Acta Biomater 2011; 7:1653-64. [PMID: 21130905 DOI: 10.1016/j.actbio.2010.11.043] [Citation(s) in RCA: 132] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Revised: 11/25/2010] [Accepted: 11/30/2010] [Indexed: 12/22/2022]
Abstract
The aim of this study was to investigate the feasibility of fabricating porous crosslinked chitosan hydrogels in an aqueous phase using dense gas CO(2) as a foaming agent. Highly porous chitosan hydrogels were formed by using glutaraldehyde and genipin as crosslinkers. The method developed here eliminates the formation of a skin layer, and does not require the use of surfactants or other toxic reagents to generate porosity. The chitosan hydrogel scaffolds had an average pore diameter of 30-40 μm. The operating pressure had a negligible effect on the pore characteristics of chitosan hydrogels. Temperature, reaction period, type of biopolymer and crosslinker had a significant impact on the pore size and characteristics of the hydrogel produced by dense gas CO(2). Scanning electron microscopy and histological analysis confirmed that the resulting porous structures allowed fibroblasts seeded on these scaffolds to proliferate into the three-dimensional (3-D) structure of these chitosan hydrogels. Live/dead staining and MTS analysis demonstrated that fibroblast cells proliferated over 7 days. The fabricated hydrogels exhibited comparable mechanical strength and swelling ratio and are potentially useful for soft tissue engineering applications such as skin and cartilage regeneration.
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Zhong X, Ji C, Chan AKL, Kazarian SG, Ruys A, Dehghani F. Fabrication of chitosan/poly(ε-caprolactone) composite hydrogels for tissue engineering applications. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:279-288. [PMID: 21170732 DOI: 10.1007/s10856-010-4194-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Accepted: 11/19/2010] [Indexed: 05/30/2023]
Abstract
The aim of this study was to fabricate three-dimensional (3D) porous chitosan/poly(ε-caprolactone) (PCL) hydrogels with improved mechanical properties for tissue engineering applications. A modified emulsion lyophilisation technique was developed to produce 3D chitosan/PCL hydrogels. The addition of 25 and 50 wt% of PCL into chitosan substantially enhanced the compressive strength of composite hydrogel 160 and 290%, respectively, compared to pure chitosan hydrogel. The result of ATR-FTIR imaging corroborated that PCL and chitosan were well mixed and physically co-existed in the composite structures. The composite hydrogels were constructed of homogenous structure with average pore size of 59.7 ± 14 μm and finer pores with average size of 4.4 ± 2 μm on the wall of these larger pores. The SEM and confocal laser scanning microscopy images confirmed that fibroblast cells were attached and proliferated on the 3D structure of these composite hydrogels. The composite hydrogels acquired in this study possessed homogeneous porous structure with improved mechanical strength and integrity. They may have a high potential for the production of 3D hydrogels for tissue engineering applications.
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Affiliation(s)
- Xia Zhong
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, Australia
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13
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Annabi N, Fathi A, Mithieux SM, Martens P, Weiss AS, Dehghani F. The effect of elastin on chondrocyte adhesion and proliferation on poly (ɛ-caprolactone)/elastin composites. Biomaterials 2010; 32:1517-25. [PMID: 21115195 DOI: 10.1016/j.biomaterials.2010.10.024] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Accepted: 10/12/2010] [Indexed: 11/28/2022]
Abstract
The aim of this study was to demonstrate the effect of elastin on chondrocyte adhesion and proliferation within the structure of poly (ɛ-caprolactone) (PCL)/elastin composites. The homogenous 3D structure composites were constructed by using high pressure CO(2) in two stages. Porous PCL structures with average pore sizes of 540 ± 21 μm and a high degree of interconnectivity were produced using gas foaming/salt leaching. The PCL scaffolds were then impregnated with elastin and cross-linked with glutaraldehyde (GA) under high pressure CO(2). The effects of elastin and cross-linker concentrations on the characteristics of composites were investigated. Increasing the elastin concentration from 25mg/ml to 100mg/ml elevated the amount of cross-linked elastin inside the macropores of PCL. Fourier transform infrared (FTIR) analysis showed that elastin was homogeneously distributed throughout the 3D structure of all composites. The weight gain of composites increased 2-fold from 15.8 ± 0.3 to 38.3 ± 0.7 (w/w) % by increasing the elastin concentration from 25mg/ml to 50mg/ml and approached a plateau above this concentration. The presence of elastin within the pores of PCL improved the water uptake properties of PCL scaffolds; the water uptake ratio of PCL was enhanced 100-fold from 0.030 ± 0.005g liquid/g polymer to 11.80 ± 0.01g liquid/g polymer, when the elastin solution concentration was 50mg/ml. These composites exhibited lower compressive modulus and energy loss compared to pure PCL scaffolds due to their higher water content and elasticity. In vitro studies show that these composites can support primary articular cartilage chondrocyte adhesion and proliferation within the 3D structures. These results demonstrate the potential of using PCL/elastin composites for cartilage repair.
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Affiliation(s)
- Nasim Annabi
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW 2006, Australia
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14
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Annabi N, Nichol JW, Zhong X, Ji C, Koshy S, Khademhosseini A, Dehghani F. Controlling the porosity and microarchitecture of hydrogels for tissue engineering. TISSUE ENGINEERING. PART B, REVIEWS 2010; 16:371-83. [PMID: 20121414 PMCID: PMC2946907 DOI: 10.1089/ten.teb.2009.0639] [Citation(s) in RCA: 739] [Impact Index Per Article: 52.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 01/29/2010] [Indexed: 12/19/2022]
Abstract
Tissue engineering holds great promise for regeneration and repair of diseased tissues, making the development of tissue engineering scaffolds a topic of great interest in biomedical research. Because of their biocompatibility and similarities to native extracellular matrix, hydrogels have emerged as leading candidates for engineered tissue scaffolds. However, precise control of hydrogel properties, such as porosity, remains a challenge. Traditional techniques for creating bulk porosity in polymers have demonstrated success in hydrogels for tissue engineering; however, often the conditions are incompatible with direct cell encapsulation. Emerging technologies have demonstrated the ability to control porosity and the microarchitectural features in hydrogels, creating engineered tissues with structure and function similar to native tissues. In this review, we explore the various technologies for controlling the porosity and microarchitecture within hydrogels, and demonstrate successful applications of combining these techniques.
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Affiliation(s)
- Nasim Annabi
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, Australia
| | - Jason W. Nichol
- Department of Medicine, Center for Biomedical Engineering, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Xia Zhong
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, Australia
| | - Chengdong Ji
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, Australia
| | - Sandeep Koshy
- Department of Medicine, Center for Biomedical Engineering, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Ali Khademhosseini
- Department of Medicine, Center for Biomedical Engineering, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Fariba Dehghani
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, Australia
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Kazarian SG, Chan KLA. Micro- and macro-attenuated total reflection Fourier transform infrared spectroscopic imaging. Plenary Lecture at the 5th International Conference on Advanced Vibrational Spectroscopy, 2009, Melbourne, Australia. APPLIED SPECTROSCOPY 2010; 64:135A-152A. [PMID: 20482963 DOI: 10.1366/000370210791211673] [Citation(s) in RCA: 117] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Fourier transform infrared (FT-IR) spectroscopic imaging has become a very powerful method in chemical analysis. In this review paper we describe a variety of opportunities for obtaining FT-IR images using the attenuated total reflection (ATR) approach and provide an overview of fundamental aspects, accessories, and applications in both micro- and macro-ATR imaging modes. The advantages and versatility of both ATR imaging modes are discussed and the spatial resolution of micro-ATR imaging is demonstrated. Micro-ATR imaging has opened up many new areas of study that were previously precluded by inadequate spatial resolution (polymer blends, pharmaceutical tablets, cross-sections of blood vessels or hair, surface of skin, single live cells, cancerous tissues). Recent applications of ATR imaging in polymer research, biomedical and forensic sciences, objects of cultural heritage, and other complex materials are outlined. The latest advances include obtaining spatially resolved chemical images from different depths within a sample, and surface-enhanced images for macro-ATR imaging have also been presented. Macro-ATR imaging is a valuable approach for high-throughput analysis of materials under controlled environments. Opportunities exist for chemical imaging of dynamic aqueous systems, such as dissolution, diffusion, microfluidics, or imaging of dynamic processes in live cells.
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Affiliation(s)
- Sergei G Kazarian
- Department of Chemical Engineering, Imperial College London, SW7 2AZ, London, England
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Annabi N, Mithieux SM, Weiss AS, Dehghani F. Cross-linked open-pore elastic hydrogels based on tropoelastin, elastin and high pressure CO2. Biomaterials 2009; 31:1655-65. [PMID: 19969349 DOI: 10.1016/j.biomaterials.2009.11.051] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2009] [Accepted: 11/17/2009] [Indexed: 11/30/2022]
Abstract
In this study the effect of high pressure CO(2) on the synthesis and characteristics of elastin-based hybrid hydrogels was investigated. Tropoelastin/alpha-elastin hybrid hydrogels were fabricated by chemically cross-linking tropoelastin/alpha-elastin solutions with glutaraldehyde at high pressure CO(2). Dense gas CO(2) had a significant impact on the characteristics of the fabricated hydrogels including porosity, swelling ratio, compressive properties, and modulus of elasticity. Compared to fabrication at atmospheric pressure high pressure CO(2) based construction eliminated the skin-like formation on the top surfaces of hydrogels and generated larger pores with an average pore size of 78 +/- 17 microm. The swelling ratios of composite hydrogels fabricated at high pressure CO(2) were lower than the gels produced at atmospheric pressure as a result of a higher degree of cross-linking. Dense gas CO(2) substantially increased the mechanical properties of fabricated hydrogels. The compressive and tensile modulus of 50/50 weight ratio tropoelastin/alpha-elastin composite hydrogels were enhanced 2 and 2.5 fold, respectively, when the pressure was increased from 1 to 60 bar. In vitro studies show that the presence of large pores throughout the hydrogel matrix fabricated at high pressure CO(2) enabled the migration of human skin fibroblast cells 300 microm into the construct.
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Affiliation(s)
- Nasim Annabi
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
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17
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The fabrication of elastin-based hydrogels using high pressure CO2. Biomaterials 2009; 30:1-7. [DOI: 10.1016/j.biomaterials.2008.09.031] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2008] [Accepted: 09/02/2008] [Indexed: 11/17/2022]
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18
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Palombo F, Cremers SG, Weinberg PD, Kazarian SG. Application of Fourier transform infrared spectroscopic imaging to the study of effects of age and dietary L-arginine on aortic lesion composition in cholesterol-fed rabbits. J R Soc Interface 2008; 6:669-80. [PMID: 18986964 DOI: 10.1098/rsif.2008.0325] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Diet-induced atherosclerotic lesions in the descending thoracic segment of rabbit aorta were analysed ex vivo by micro-attenuated total reflection (ATR)-Fourier transform infrared (FTIR) spectroscopic imaging. The distribution and chemical character of lipid deposits within the arterial wall near intercostal branch ostia were assessed in histological sections from immature and mature rabbits fed cholesterol with or without l-arginine supplements. Previous studies have shown that both these properties change with age in cholesterol-fed rabbits, putatively owing to changes in the synthesis of nitric oxide (NO) from l-arginine. Immature animals developed lesions at the downstream margin of the branch ostium, whereas lipid deposition was observed at the lateral margins in mature animals. Dietary l-arginine supplements had beneficial effects in mature rabbit aorta, with overall disappearance of the plaques; on the other hand, they caused only a slight decrease of the lipid load in lesions at the downstream margin of the ostium in immature rabbits. ATR-FTIR imaging enabled differences in the lipid to protein density ratio of atherosclerotic lesions caused by age and diet to be visualized. Lipid deposits in immature rabbits showed higher relative absorbance values of their characteristic spectral bands compared with those in immature l-arginine-fed rabbits and mature rabbits. The multivariate methods of principal component analysis (PCA) and factor analysis (FA) were employed, and relevant chemical and structural information were obtained. Two distinct protein constituents of the intima-media layer at different locations of the wall were identified using the method of FA. This approach provides a valuable means of investigating the structure and chemistry of complex heterogeneous systems. It has potential for in vivo diagnosis of pathology.
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Affiliation(s)
- Francesca Palombo
- Department of Chemical Engineering and Chemical Technology, Imperial College London, London SW7 2AZ, UK
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Chan KLA, Kazarian SG. Attenuated total reflection-Fourier transform infrared imaging of large areas using inverted prism crystals and combining imaging and mapping. APPLIED SPECTROSCOPY 2008; 62:1095-1101. [PMID: 18926018 DOI: 10.1366/000370208786049042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Attenuated total reflection-Fourier transform infrared (ATR-FT-IR) imaging is a very useful tool for capturing chemical images of various materials due to the simple sample preparation and the ability to measure wet samples or samples in an aqueous environment. However, the size of the array detector used for image acquisition is often limited and there is usually a trade off between spatial resolution and the field of view (FOV). The combination of mapping and imaging can be used to acquire images with a larger FOV without sacrificing spatial resolution. Previous attempts have demonstrated this using an infrared microscope and a Germanium hemispherical ATR crystal to achieve images of up to 2.5 mm x 2.5 mm but with varying spatial resolution and depth of penetration across the imaged area. In this paper, we demonstrate a combination of mapping and imaging with a different approach using an external optics housing for large ATR accessories and inverted ATR prisms to achieve ATR-FT-IR images with a large FOV and reasonable spatial resolution. The results have shown that a FOV of 10 mm x 14 mm can be obtained with a spatial resolution of approximately 40-60 microm when using an accessory that gives no magnification. A FOV of 1.3 mm x 1.3 mm can be obtained with spatial resolution of approximately 15-20 microm when using a diamond ATR imaging accessory with 4x magnification. No significant change in image quality such as spatial resolution or depth of penetration has been observed across the whole FOV with this method and the measurement time was approximately 15 minutes for an image consisting of 16 image tiles.
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Affiliation(s)
- K L Andrew Chan
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
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