1
|
Carbajo-Gordillo AI, Benito E, Galbis E, Grosso R, Iglesias N, Valencia C, Lucas R, García-Martín MG, de-Paz MV. Simultaneous Formation of Polyhydroxyurethanes and Multicomponent Semi-IPN Hydrogels. Polymers (Basel) 2024; 16:880. [PMID: 38611138 PMCID: PMC11013152 DOI: 10.3390/polym16070880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 03/16/2024] [Accepted: 03/19/2024] [Indexed: 04/14/2024] Open
Abstract
This study introduces an efficient strategy for synthesizing polyhydroxyurethane-based multicomponent hydrogels with enhanced rheological properties. In a single-step process, 3D materials composed of Polymer 1 (PHU) and Polymer 2 (PVA or gelatin) were produced. Polymer 1, a crosslinked polyhydroxyurethane (PHU), grew within a colloidal solution of Polymer 2, forming an interconnected network. The synthesis of Polymer 1 utilized a Non-Isocyanate Polyurethane (NIPU) methodology based on the aminolysis of bis(cyclic carbonate) (bisCC) monomers derived from 1-thioglycerol and 1,2-dithioglycerol (monomers A and E, respectively). This method, applied for the first time in Semi-Interpenetrating Network (SIPN) formation, demonstrated exceptional orthogonality since the functional groups in Polymer 2 do not interfere with Polymer 1 formation. Optimizing PHU formation involved a 20-trial methodology, identifying influential variables such as polymer concentration, temperature, solvent (an aprotic and a protic solvent), and the organo-catalyst used [a thiourea derivative (TU) and 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU)]. The highest molecular weights were achieved under near-bulk polymerization conditions using TU-protic and DBU-aprotic as catalyst-solvent combinations. Monomer E-based PHU exhibited higher Mw¯ than monomer A-based PHU (34.1 kDa and 16.4 kDa, respectively). Applying the enhanced methodology to prepare 10 multicomponent hydrogels using PVA or gelatin as the polymer scaffold revealed superior rheological properties in PVA-based hydrogels, exhibiting solid-like gel behavior. Incorporating monomer E enhanced mechanical properties and elasticity (with loss tangent values of 0.09 and 0.14). SEM images unveiled distinct microstructures, including a sponge-like pattern in certain PVA-based hydrogels when monomer A was chosen, indicating the formation of highly superporous interpenetrated materials. In summary, this innovative approach presents a versatile methodology for obtaining advanced hydrogel-based systems with potential applications in various biomedical fields.
Collapse
Affiliation(s)
- Ana I. Carbajo-Gordillo
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - Elena Benito
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - Elsa Galbis
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - Roberto Grosso
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - Nieves Iglesias
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - Concepción Valencia
- Dpto. Ingeniería Química, Facultad de Ciencias Experimentales, Campus El Carmen, Universidad de Huelva, 21071 Huelva, Spain
- Pro2TecS—Chemical Process and Product Technology Research Center, Universidad de Huelva, 21071 Huelva, Spain
| | - Ricardo Lucas
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - M.-Gracia García-Martín
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| | - M.-Violante de-Paz
- Dpto. Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain (R.L.); (M.-G.G.-M.)
| |
Collapse
|
2
|
Collagen Alignment via Electro-Compaction for Biofabrication Applications: A Review. Polymers (Basel) 2022; 14:polym14204270. [PMID: 36297848 PMCID: PMC9609630 DOI: 10.3390/polym14204270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/05/2022] [Accepted: 10/05/2022] [Indexed: 11/24/2022] Open
Abstract
As the most prevalent structural protein in the extracellular matrix, collagen has been extensively investigated for biofabrication-based applications. However, its utilisation has been impeded due to a lack of sufficient mechanical toughness and the inability of the scaffold to mimic complex natural tissues. The anisotropic alignment of collagen fibres has been proven to be an effective method to enhance its overall mechanical properties and produce biomimetic scaffolds. This review introduces the complicated scenario of collagen structure, fibril arrangement, type, function, and in addition, distribution within the body for the enhancement of collagen-based scaffolds. We describe and compare existing approaches for the alignment of collagen with a sharper focus on electro-compaction. Additionally, various effective processes to further enhance electro-compacted collagen, such as crosslinking, the addition of filler materials, and post-alignment fabrication techniques, are discussed. Finally, current challenges and future directions for the electro-compaction of collagen are presented, providing guidance for the further development of collagenous scaffolds for bioengineering and nanotechnology.
Collapse
|
3
|
Gurumurthy B, Janorkar AV. Improvements in mechanical properties of collagen-based scaffolds for tissue engineering. CURRENT OPINION IN BIOMEDICAL ENGINEERING 2021. [DOI: 10.1016/j.cobme.2020.100253] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
4
|
Gurumurthy B, Pal P, Griggs JA, Janorkar AV. OPTIMIZATION OF COLLAGEN-ELASTIN-LIKE POLYPEPTIDE-BIOGLASS SCAFFOLD COMPOSITION FOR OSTEOGENIC DIFFERENTIATION OF ADIPOSE-DERIVED STEM CELLS. MATERIALIA 2020; 9:10.1016/j.mtla.2019.100572. [PMID: 32133439 PMCID: PMC7055731 DOI: 10.1016/j.mtla.2019.100572] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We have developed a multicomponent hydrogel scaffold that can mimic the bone extracellular matrix by incorporating collagen, elastin-like polypeptide (ELP), and Bioglass. We examined the effects of Bioglass addition to collagen-ELP scaffolds on mechanical properties, physical characteristics, and in vitro osteogenic differentiation, by varying the Bioglass amount and particle size. Response surface methodology with a central composite design predicted 5 mg (6.6 mg/mL) Bioglass with a particle size of 142 ± 5 μm as the optimal amount and particle size to be mixed with 6 mg/mL collagen and 18 mg/mL ELP to obtain a combination of maximized compressive properties. Swelling ratio and FTIR spectroscopy indicated lower hydrophilicity and the presence of hydrophobic and secondary interactions between collagen, ELP, and Bioglass. Scanning electron microscopy showed a nanofibrous morphology of intermingled collagen-ELP-Bioglass network. In vitro osteogenic characterization using human adipose-derived stem cells revealed increased cell attachment and proliferation with increased ALP activity, osteocalcin content, and mineralized deposit formation during a three-week culture. Numerous mineralized deposits composed of calcium and phosphorous were shown by energy dispersive spectroscopy. Overall, our results show that the collagen-ELP-Bioglass multicomponent composites have enhanced mechanical properties with adequate physical features and cell culture properties for bone tissue engineering.
Collapse
Affiliation(s)
| | | | | | - Amol V. Janorkar
- Corresponding author: Telephone: (601) 984-6170; Fax: (601) 984-6087;
| |
Collapse
|
5
|
Liu C, Zhang H, Chen L, Dai B. A simplified capillary model for hydrodynamics simulation of cryogel continuous beds and particle packed beds. Chem Eng Res Des 2019. [DOI: 10.1016/j.cherd.2019.03.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
6
|
Gurumurthy B, Griggs JA, Janorkar AV. Optimization of collagen-elastin-like polypeptide composite tissue engineering scaffolds using response surface methodology. J Mech Behav Biomed Mater 2018; 84:116-125. [DOI: 10.1016/j.jmbbm.2018.04.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/19/2018] [Accepted: 04/21/2018] [Indexed: 02/07/2023]
|
7
|
Chakraborty J, Roy S, Murab S, Ravani R, Kaur K, Devi S, Singh D, Sharma S, Mohanty S, Dinda AK, Tandon R, Ghosh S. Modulation of Macrophage Phenotype, Maturation, and Graft Integration through Chondroitin Sulfate Cross-Linking to Decellularized Cornea. ACS Biomater Sci Eng 2018; 5:165-179. [PMID: 33405862 DOI: 10.1021/acsbiomaterials.8b00251] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Decellularized corneas obtained from other species have gained intense popularity in the field of tissue engineering due to its role to serve as an alternative to the limited availability of high-quality donor tissues. However, the decellularized cornea is found to evoke an immune response inspite of the removal of the cellular contents and antigens due to the distortion of the collagen fibrils that exposes certain antigenic sites, which often lead to graft rejection. Therefore, in this study we tested the hypothesis that cross-linking the decellularized corneas with chondroitin sulfate may help in restoring the distorted conformationation changes of fibrous matrix and thus help in reducing the occurrence of graft rejection. Cross-linking of the decellularized cornea with oxidized chondroitin sulfate was validated by ATR-FTIR analysis. An in vitro immune response study involving healthy monocytes and differentiated macrophages with their surface marker analysis by pHrodo red, Lysotracker red, ER tracker, and CD63, LAMP-2 antibodies confirmed that the cross-linked decellularized matrices elicited the least immune response compared to the decellularized ones. We implanted three sets of corneal scaffolds obtained from goat, i.e., native, decellularized, and decellularized corneas conjugated with chondroitin sulfate into the rabbit stroma. Histology analysis, three months after implantation into the rabbit corneal stromal region, confirmed the restoration of the collagen fibril conformation and the migration of cells to the implanted constructs, affirming proper graft integration. Hence we conclude that the chondroitin sulfate cross-linked decellularized corneal matrix may serve as an efficient alternative to the allograft and human cadaveric corneas.
Collapse
Affiliation(s)
- Juhi Chakraborty
- Regenerative Engineering Laboratory, Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Subhadeep Roy
- Regenerative Engineering Laboratory, Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Sumit Murab
- Regenerative Engineering Laboratory, Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi 110016, India
| | | | - Kulwinder Kaur
- Regenerative Engineering Laboratory, Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi 110016, India
| | | | | | | | | | | | | | - Sourabh Ghosh
- Regenerative Engineering Laboratory, Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi 110016, India
| |
Collapse
|
8
|
Casali DM, Handleton RM, Shazly T, Matthews MA. A novel supercritical CO 2 -based decellularization method for maintaining scaffold hydration and mechanical properties. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2017.07.021] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
9
|
Bonaccorso F, Bartolotta A, Coleman JN, Backes C. 2D-Crystal-Based Functional Inks. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:6136-66. [PMID: 27273554 DOI: 10.1002/adma.201506410] [Citation(s) in RCA: 167] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Revised: 03/09/2016] [Indexed: 05/19/2023]
Abstract
The possibility to produce and process graphene, related 2D crystals, and heterostructures in the liquid phase makes them promising materials for an ever-growing class of applications as composite materials, sensors, in flexible optoelectronics, and energy storage and conversion. In particular, the ability to formulate functional inks with on-demand rheological and morphological properties, i.e., lateral size and thickness of the dispersed 2D crystals, is a step forward toward the development of industrial-scale, reliable, inexpensive printing/coating processes, a boost for the full exploitation of such nanomaterials. Here, the exfoliation strategies of graphite and other layered crystals are reviewed, along with the advances in the sorting of lateral size and thickness of the exfoliated sheets together with the formulation of functional inks and the current development of printing/coating processes of interest for the realization of 2D-crystal-based devices.
Collapse
Affiliation(s)
- Francesco Bonaccorso
- Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, Genova, 16163, Italy
| | - Antonino Bartolotta
- CNR-IPCF, Istituto per i Processi Chimico-Fisici, Via F. Stagno D'Alcontres 37, Messina, 98158, Italy
| | - Jonathan N Coleman
- School of Physics and CRANN, Trinity College Dublin, Pearse St, Dublin 2, Ireland
| | - Claudia Backes
- Applied Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, Heidelberg, 69120, Germany
| |
Collapse
|
10
|
Lin KF, He S, Song Y, Wang CM, Gao Y, Li JQ, Tang P, Wang Z, Bi L, Pei GX. Low-Temperature Additive Manufacturing of Biomimic Three-Dimensional Hydroxyapatite/Collagen Scaffolds for Bone Regeneration. ACS APPLIED MATERIALS & INTERFACES 2016; 8:6905-16. [PMID: 26930140 DOI: 10.1021/acsami.6b00815] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Low-temperature additive manufacturing (AM) holds promise for fabrication of three-dimensional (3D) scaffolds containing bioactive molecules and/or drugs. Due to the strict technical limitations of current approaches, few materials are suitable for printing at low temperature. Here, a low-temperature robocasting method was employed to print biomimic 3D scaffolds for bone regeneration using a routine collagen-hydroxyapatite (CHA) composite material, which is too viscous to be printed via normal 3D printing methods at low temperature. The CHA scaffolds had excellent 3D structure and maintained most raw material properties after printing. Compared to nonprinted scaffolds, printed scaffolds promoted bone marrow stromal cell proliferation and improved osteogenic outcome in vitro. In a rabbit femoral condyle defect model, the interconnecting pores within the printed scaffolds facilitated cell penetration and mineralization before the scaffolds degraded and enhanced repair, compared to nonprinted CHA scaffolds. Additionally, the optimal printing parameters for 3D CHA scaffolds were investigated; 600-μm-diameter rods were optimal in terms of moderate mechanical strength and better repair outcome in vivo. This low-temperature robocasting method could enable a variety of bioactive molecules to be incorporated into printed CHA materials and provides a method of bioprinting biomaterials without compromising their natural properties.
Collapse
Affiliation(s)
- Kai-Feng Lin
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Shu He
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Yue Song
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Chun-Mei Wang
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Yi Gao
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Jun-Qin Li
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Peng Tang
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Zheng Wang
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Long Bi
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| | - Guo-Xian Pei
- Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University , Xi'an, 710032, P. R. China
| |
Collapse
|
11
|
Huang Y, He J, Gan L, Liu X, Wu Y, Wu F, Gu ZW. Osteoconductivity and osteoinductivity of porous hydroxyapatite coatings deposited by liquid precursor plasma spraying: in vivo biological response study. ACTA ACUST UNITED AC 2014; 9:065007. [PMID: 25384201 DOI: 10.1088/1748-6041/9/6/065007] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The beneficial effect of a porous structure on the biological functions of calcium phosphate bulk ceramic or scaffold has been well documented. Nevertheless, the effect of a porous structure on the in vivo performance of hydroxyapatite (HA) coatings has been rarely reported, partly due to the difficulty in synthesizing porous HA coatings suitable for commercial applications. In this study, we have carried out a systematic in vivo study of porous HA-coated Ti implants (with and without surface modification) prepared by the liquid precursor plasma spraying process, in terms of its osteoconductivity and osteoinductivity. The results suggest the clear advantage of the porous structure over the dense structure, despite the pore structure (about 48% porosity and less than 100 μm average pore size) being far from the ideal pore structure reported for bulk ceramic. The porous HA-coated implant significantly promotes early bone ingrowth at the pre-generated defective region, and early fixation at the bone-implant interface, especially at early implantation time (one month), showing about 120% and 40% increases respectively over those of the dense HA-coated implants prepared by the conventional atmospheric plasma spraying process. Moreover, the porous structure can be readily used to incorporate collagen/rh-BMP2, which demonstrates clear ectopic bone formation. Overall, the results suggest the augmentation of bone ingrowth is significant for HA coatings with a porous structure, which is critical for the early fixation and long-term stability of medical implants.
Collapse
Affiliation(s)
- Yi Huang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, People's Republic of China. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
12
|
Liao CZ, Wong HM, Yeung KWK, Tjong SC. The development, fabrication, and material characterization of polypropylene composites reinforced with carbon nanofiber and hydroxyapatite nanorod hybrid fillers. Int J Nanomedicine 2014; 9:1299-310. [PMID: 24648729 PMCID: PMC3956629 DOI: 10.2147/ijn.s58332] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
This study focuses on the design, fabrication, microstructural and property characterization, and biocompatibility evaluation of polypropylene (PP) reinforced with carbon nanofiber (CNF) and hydroxyapatite nanorod (HANR) fillers. The purpose is to develop advanced PP/CNF–HANR hybrids with good mechanical behavior, thermal stability, and excellent biocompatibility for use as craniofacial implants in orthopedics. Several material-examination techniques, including X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, tensile tests, and impact measurement are used to characterize the microstructural, mechanical, and thermal properties of the hybrids. Furthermore, osteoblastic cell cultivation and colorimetric assay are also employed for assessing their viability on the composites. The CNF and HANR filler hybridization yields an improvement in Young’s modulus, impact strength, thermal stability, and biocompatibility of PP. The PP/2% CNF–20% HANR hybrid composite is found to exhibit the highest elastic modulus, tensile strength, thermal stability, and biocompatibility.
Collapse
Affiliation(s)
- Cheng Zhu Liao
- Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, People's Republic of China ; Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
| | - Hoi Man Wong
- Department of Orthopedics and Traumatology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong
| | - Kelvin Wai Kwok Yeung
- Department of Orthopedics and Traumatology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong
| | - Sie Chin Tjong
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
| |
Collapse
|
13
|
Yahyouche A, Zhidao X, Triffitt JT, Czernuszka JT, Clover AJP. Improved angiogenic cell penetration in vitro and in vivo in collagen scaffolds with internal channels. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:1571-1580. [PMID: 23645077 DOI: 10.1007/s10856-013-4912-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 03/09/2013] [Indexed: 06/02/2023]
Abstract
Porous scaffolds are limited in volume due to diffusion constraint and delay of vascular network formation. Channels have the potential to speed up cellular penetration. Their effectiveness in improving angiogenic cell penetration was assessed in vitro and in vivo in 3-D collagen scaffolds. In vitro, channelled and non-channelled scaffolds were seeded with vascular smooth muscle cells. Results demonstrated that the scaffolds supported angiogenic cell ingrowth in culture and the channels improved the depth of cell penetration into the scaffold (P < 0.05). The cells reside mainly around and migrate along the channels. In vivo, channels increased cell migration into the scaffolds (P < 0.05) particularly angiogenic cells (P < 0.05) resulting in a clear branched vascular network of microvessels after 2 weeks in the channelled samples which was not apparent in the non-channelled samples. Channels could aid production of tissue engineered constructs by offering the possibility of rapid blood vessel infiltration into collagen scaffolds.
Collapse
Affiliation(s)
- Asma Yahyouche
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
| | | | | | | | | |
Collapse
|
14
|
Novel polypropylene biocomposites reinforced with carbon nanotubes and hydroxyapatite nanorods for bone replacements. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:1380-8. [DOI: 10.1016/j.msec.2012.12.039] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 10/08/2012] [Accepted: 12/04/2012] [Indexed: 11/24/2022]
|
15
|
Tien WB, Chen MT, Yao PC. Effects of pH and temperature on microstructure and morphology of hydroxyapatite/collagen composites synthesized in vitro. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012; 32:2096-2102. [DOI: 10.1016/j.msec.2012.05.046] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 03/21/2012] [Accepted: 05/25/2012] [Indexed: 10/28/2022]
|
16
|
Kang HW, Cho DW. Development of an indirect stereolithography technology for scaffold fabrication with a wide range of biomaterial selectivity. Tissue Eng Part C Methods 2012; 18:719-29. [PMID: 22443315 PMCID: PMC3427641 DOI: 10.1089/ten.tec.2011.0621] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Accepted: 03/21/2012] [Indexed: 11/13/2022] Open
Abstract
Tissue engineering, which is the study of generating biological substitutes to restore or replace tissues or organs, has the potential to meet current needs for organ transplantation and medical interventions. Various approaches have been attempted to apply three-dimensional (3D) solid freeform fabrication technologies to tissue engineering for scaffold fabrication. Among these, the stereolithography (SL) technology not only has the highest resolution, but also offers quick fabrication. However, a lack of suitable biomaterials is a barrier to applying the SL technology to tissue engineering. In this study, an indirect SL method that combines the SL technology and a sacrificial molding process was developed to address this challenge. A sacrificial mold with an inverse porous shape was fabricated from an alkali-soluble photopolymer by the SL technology. A sacrificial molding process was then developed for scaffold construction using a variety of biomaterials. The results indicated a wide range of biomaterial selectivity and a high resolution. Achievable minimum pore and strut sizes were as large as 50 and 65 μm, respectively. This technology can also be used to fabricate three-dimensional organ shapes, and combined with traditional fabrication methods to construct a new type of scaffold with a dual-pore size. Cytotoxicity tests, as well as nuclear magnetic resonance and gel permeation chromatography analyses, showed that this technology has great potential for tissue engineering applications.
Collapse
Affiliation(s)
- Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, North Carolina
| | - Dong-Woo Cho
- Department of Mechanical Engineering, Pohang University of Science and Technology, Gyungbuk, South Korea
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Gyungbuk, South Korea
| |
Collapse
|
17
|
Chitosan: A Promising Biomaterial for Tissue Engineering Scaffolds. ADVANCES IN POLYMER SCIENCE 2011. [DOI: 10.1007/12_2011_112] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
18
|
Huang Y, Song L, Liu X, Xiao Y, Wu Y, Chen J, Wu F, Gu Z. Hydroxyapatite coatings deposited by liquid precursor plasma spraying: controlled dense and porous microstructures and osteoblastic cell responses. Biofabrication 2010; 2:045003. [DOI: 10.1088/1758-5082/2/4/045003] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
19
|
Organic/inorganic bioactive materials part IV: In vitro assessment of bioactivity of gelatin-calcium phosphate silicate/wollastonite hybrids. OPEN CHEM 2010. [DOI: 10.2478/s11532-009-0142-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractBiohybrids consisting of gelatin (G) and calcium phosphate silicate/wollastonite (CPS/W) have not been prepared so far. In this work our results are focused on the possibility of obtaining G-CPS/W bioactive hybrids in vitro. XRD, FTIR, SEM/EDS techniques were employed to characterize the synthesized hybrid materials. FTIR shows that before immersion in 1.5 SBF the “red shift” of COO- band for pure G is observed. The presence of this bond could be attributed to the formation of COO-Ca2+ via non-biomimetic route. After immersion in 1.5 SBF, FTIR shows the presence of A- and B-type carbonate containing hydroxyapatite (A/B-CO3HA). ESD and FTIR show that small amount of calcite (CaCO3) are present after in vitro test in 1.5 SBF for 3 days. XRD reveals that CO3HA and small amounts of CaCO3 can be detected after in vitro test. SEM results obtained for immersed samples show that hydroxyapatite (HA) particles fully covered the surface of the hybrids by a layer composed of spherulites. At higher magnification, very small elongated crystallites could be observed.
Collapse
|
20
|
Organic / inorganic bioactive materials Part I: Synthesis, structure and in vitro assessment of collagen/silicocarnotite biocoatings. OPEN CHEM 2009. [DOI: 10.2478/s11532-009-0067-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractThe silicocarnotite, as an inorganic part of the coatings, has been synthesized using a polystep sol-gel method. The chemical composition of the prepared silicocarnotite sol is described as 58.12 CaO, 29.42 P2O5, 12.45 SiO2 (wt%), where Ca/P+Si = 1,67. The acid soluble type I collagen, as an organic part of the obtained coatings, was mixed with silicocarnotite powder in a weight ratio of 25:75 and 75:25 weight ratio without cross-linkage. The acidity of the obtained mixture was readjust with 25% NH4OH to pH = 9.0. The mixture was then dried at 37°C for 12 h.The growth of B-type carbonate containing hydroxyapatite (B-type CO3HA) in which CO3
2+→PO4
3− on the surface of collagen/silicocarnotite coatings soaked in 1.5 simulated body fluid (1.5 SBF) was observed. The nucleation of B-type CO3HA was estimated on the obtained coatings after 3 days immersion in 1.5 SBF. The negatively charged carboxylate groups from the collagen surface may be responsible for the HA deposition. This was confirmed by the “red shift” of carboxylate groups of collagen molecules in the FTIR spectra. After soaking in 1.5 SBF, the morphology of prepared coatings and HA formation was observed by SEM.
Collapse
|
21
|
Organic/Inorganic bioactive materials Part II: in vitro bioactivity of Collagen-Calcium Phosphate Silicate/Wollastonite hybrids. OPEN CHEM 2009. [DOI: 10.2478/s11532-009-0076-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractIn the present study, novel hybrid materials of Collagen (C) and Calcium Phosphate Silicate/Wollastonite (CPS/W) were synthesized. The CPS/W ceramic was prepared via polystep sol-gel method. The dissolution test of CPS/W ceramic was filled with TRIS-HCl buffer. FTIR depicts that hydroxyl carbonate apatite (OHCO3HA) was observed after 3 days of immersion in TRIS-HCl buffer. Biohybrids of C-CPS/W were produced from diluted hydrochloric acid collagen type I and ceramic powder with different ratios of C and CPS/W equal to 25:75 and 75:25 wt.%. The synthesized hybrids were characterized by FTIR, XRD and SEM. FTIR depicts a “red shift” if amide I could be attributed to the fact that the collagen prefers to chelate Ca2+ from partial dissolution of CPS/W ceramic. The growth of B-type carbonate containing hydroxyapatite (B-CO3HA) on the C-CPS/W hybrids soaked in 1.5SBF was observed. The negatively charged carboxylate groups from the collagen may be responsible for hydroxyapatite (HA) deposition. This fact was confirmed by the “red shift” of carboxylate groups of collagen in FTIR spectra. The formation of HA was observed by FTIR, XRD and SEM.
Collapse
|
22
|
Advances in progenitor cell therapy using scaffolding constructs for central nervous system injury. Stem Cell Rev Rep 2009; 5:283-300. [PMID: 19644777 DOI: 10.1007/s12015-009-9081-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Accepted: 06/18/2009] [Indexed: 01/16/2023]
Abstract
Traumatic brain injury (TBI) is a major cause of morbidity and mortality in the United States. Current clinical therapy is focused on optimization of the acute/subacute intracerebral milieu, minimizing continued cell death, and subsequent intense rehabilitation to ameliorate the prolonged physical, cognitive, and psychosocial deficits that result from TBI. Adult progenitor (stem) cell therapies have shown promise in pre-clinical studies and remain a focus of intense scientific investigation. One of the fundamental challenges to successful translation of the large body of pre-clinical work is the delivery of progenitor cells to the target location/organ. Classically used vehicles such as intravenous and intra arterial infusion have shown low engraftment rates and risk of distal emboli. Novel delivery methods such as nanofiber scaffold implantation could provide the structural and nutritive support required for progenitor cell proliferation, engraftment, and differentiation. The focus of this review is to explore the current state of the art as it relates to current and novel progenitor cell delivery methods.
Collapse
|