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Karna S, Lee JE, Kim YS, Min TJ, Yoo SM, Kim CH, Kim Y, Kim JW, Lee JH, Park SH, Kim TH, Jo WM. Comprehensive feasibility evaluation of small-diameter 3D templated vascular graft via physical characterizations and in-vivoexperiments. Biomed Mater 2023; 18. [PMID: 37531968 DOI: 10.1088/1748-605x/aceced] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 08/02/2023] [Indexed: 08/04/2023]
Abstract
3D printing (3DP) technology for tissue engineering applications has been extensively studied for materials and processes. However, clinical application to the vascular system was limited owing to mechanical inconsistency and toxicity. Here, we characterized 3D templated artificial vascular grafts (3D grafts), which were fabricated by an integrative method involving 3DP, dip coating, and salt leaching method. The as-fabricated grafts were featured with micrometer-scale porosity enabling tissue-mimetic mechanical softness comparable with native blood vessels. In terms of mechanical properties and water permeability, the fabricated 3D grafts exhibited comparable or superior performances compared to the commercialized grafts. Furthermore, thein-vivostability of the 3D graft was validated through a toxicity test, and the small-diameter 3D graft was transplanted into a rat to confirm the implant's performance. Overall, the experimental results demonstrated the clinical feasibility of the 3D graft with retaining the mechanical biocompatibility and also revealed the possibility of patient-specific customization.
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Affiliation(s)
- Sandeep Karna
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Republic of Korea
| | - Ji Eun Lee
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Republic of Korea
| | - Yeong Seo Kim
- School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Too Jae Min
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Republic of Korea
| | - Sung Mook Yoo
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Republic of Korea
| | - Chae Hwa Kim
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Republic of Korea
| | - Yuseok Kim
- School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Ji-Won Kim
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Republic of Korea
| | - Ju Han Lee
- Department of Pathology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Republic of Korea
| | - Suk-Hee Park
- School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Tae Hee Kim
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Republic of Korea
| | - Won-Min Jo
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Republic of Korea
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Yang N, Venezuela J, Allavena R, Lau C, Dargusch M. Zinc-based subcuticular absorbable staples: An in vivo and in vitro study. Acta Biomater 2023:S1742-7061(23)00355-0. [PMID: 37369266 DOI: 10.1016/j.actbio.2023.06.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 05/23/2023] [Accepted: 06/21/2023] [Indexed: 06/29/2023]
Abstract
A zinc-nutrient element alloy (Zn-1.0Cu-0.5Ca) was developed into subcuticular absorbable staples (SAS) as a robust alternative to the commercially available poly(l-lactide-co-glycolide) (PLGA) SAS for the first time. The fixation properties of the Zn SAS were measured via pull-out tests and in-situ lap-shear pull-out test comparatively against the PLGA SAS. The Zn SAS exhibited fixation force of 18.9±0.2 N, which was over three times higher than that of PLGA SAS (5.5±0.1 N). The Zn SAS was used to close incision wounds in a SD rat model for biodegradability and biocompatibility characterisation at 1, 4 and 12 weeks. The Zn SAS showed uniform degradation behaviour after in vivo implantation at the average rate of 198±54, 112±28, and 70±24 μm/y after 1, 4, and 12 weeks, which reduced the fixation force to 16.8±1.1 N, 15.4±0.9 N, 12.7±0.7 N, respectively. These findings showed the potential of the Zn SAS for the closure of heavy loading and slowing healing tissues. The Zn SAS enabled successful closure and healing of the incision wound, similar to the PLGA staples. However, the slow long-term degradation rate of the Zn SAS may lead to unnecessary implant retention. In addition, the alloy SAS resulted in higher local foreign body responses due to their stiffness. Reducing the implant cross-section profile and applying low stiffness and a corrosion-accelerating coating are suggested as possible approaches to reduce post-service implant retention and improve the biocompatibility of the Zn SAS. STATEMENT OF SIGNIFICANCE: This work reports the fabrication of the first metallic subcuticular absorbable staples (SAS) made from Zn-Cu-Ca alloy for skin wound closure applications. The Zn-based SAS were characterised in vitro and in vivo (SD rat model) for biodegradability, fixation properties, biocompatibility and inflammatory responses, which were compared against the commercially available PLGA-based SAS. The Zn-based SAS provided a secure attachment of the full-thickness wounds on SD rats and allowed successful healing during the 12-week service period. In addition, the in vitro results showed that the Zn-based SAS provided more than three times higher fixation strength than the commercial PLGA, indicating the potential of the Zn-based SAS for load-bearing wound closure application.
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Affiliation(s)
- Nan Yang
- Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM) School of Mechanical and Mining Engineering, Advanced Engineering Building, Bld 49, The University of Queensland, Staff House Rd, St Lucia QLD 4072, Australia
| | - Jeffrey Venezuela
- Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM) School of Mechanical and Mining Engineering, Advanced Engineering Building, Bld 49, The University of Queensland, Staff House Rd, St Lucia QLD 4072, Australia
| | - Rachel Allavena
- School of Veterinary Science, The University of Queensland, Gatton, QLD 4343, Australia
| | - Cora Lau
- The University of Queensland, Biological Resources, Brisbane, QLD, 4072, Australia
| | - Matthew Dargusch
- Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM) School of Mechanical and Mining Engineering, Advanced Engineering Building, Bld 49, The University of Queensland, Staff House Rd, St Lucia QLD 4072, Australia.
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Hong Y, Zhao Y, Li H, Yang Y, Chen M, Wang X, Luo M, Wang K. Engineering the maturation of stem cell-derived cardiomyocytes. Front Bioeng Biotechnol 2023; 11:1155052. [PMID: 37034258 PMCID: PMC10073467 DOI: 10.3389/fbioe.2023.1155052] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 03/06/2023] [Indexed: 04/11/2023] Open
Abstract
The maturation of human stem cell-derived cardiomyocytes (hSC-CMs) has been a major challenge to further expand the scope of their application. Over the past years, several strategies have been proven to facilitate the structural and functional maturation of hSC-CMs, which include but are not limited to engineering the geometry or stiffness of substrates, providing favorable extracellular matrices, applying mechanical stretch, fluidic or electrical stimulation, co-culturing with niche cells, regulating biochemical cues such as hormones and transcription factors, engineering and redirecting metabolic patterns, developing 3D cardiac constructs such as cardiac organoid or engineered heart tissue, or culturing under in vivo implantation. In this review, we summarize these maturation strategies, especially the recent advancements, and discussed their advantages as well as the pressing problems that need to be addressed in future studies.
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Affiliation(s)
- Yi Hong
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
| | - Yun Zhao
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
| | - Hao Li
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
| | - Yunshu Yang
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
| | - Meining Chen
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
| | - Xi Wang
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
- *Correspondence: Kai Wang, ; Mingyao Luo, ; Xi Wang,
| | - Mingyao Luo
- Center of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Department of Vascular Surgery, Fuwai Yunnan Cardiovascular Hospital, Affiliated Cardiovascular Hospital of Kunming Medical University, Kunming, Yunnan, China
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Beijing, China
- *Correspondence: Kai Wang, ; Mingyao Luo, ; Xi Wang,
| | - Kai Wang
- Key Laboratory of Molecular Cardiovascular Science, Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University, Ministry of Education, Beijing, China
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Beijing, China
- *Correspondence: Kai Wang, ; Mingyao Luo, ; Xi Wang,
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Rappe KS, Ortiz-Hernandez M, Punset M, Molmeneu M, Barba A, Mas-Moruno C, Guillem-Marti J, Caparrós C, Rupérez E, Calero J, Manzanares MC, Gil J, Franch J. On-Growth and In-Growth Osseointegration Enhancement in PM Porous Ti-Scaffolds by Two Different Bioactivation Strategies: Alkali Thermochemical Treatment and RGD Peptide Coating. Int J Mol Sci 2022; 23:1750. [PMID: 35163682 DOI: 10.3390/ijms23031750] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 01/25/2022] [Accepted: 01/30/2022] [Indexed: 02/01/2023] Open
Abstract
A lack of primary stability and osteointegration in metallic implants may result in implant loosening and failure. Adding porosity to metallic implants reduces the stress shielding effect and improves implant performance, allowing the surrounding bone tissue to grow into the scaffold. However, a bioactive surface is needed to stimulate implant osteointegration and improve mechanical stability. In this study, porous titanium implants were produced via powder sintering to create different porous diameters and open interconnectivity. Two strategies were used to generate a bioactive surface on the metallic foams: (1) an inorganic alkali thermochemical treatment, (2) grafting a cell adhesive tripeptide (RGD). RGD peptides exhibit an affinity for integrins expressed by osteoblasts, and have been reported to improve osteoblast adhesion, whereas the thermochemical treatment is known to improve titanium implant osseointegration upon implantation. Bioactivated scaffolds and control samples were implanted into the tibiae of rabbits to analyze the effect of these two strategies in vivo regarding bone tissue regeneration through interconnected porosity. Histomorphometric evaluation was performed at 4 and 12 weeks after implantation. Bone-to-implant contact (BIC) and bone in-growth and on-growth were evaluated in different regions of interest (ROIs) inside and outside the implant. The results of this study show that after a long-term postoperative period, the RGD-coated samples presented higher quantification values of quantified newly formed bone tissue in the implant's outer area. However, the total analyzed bone in-growth was observed to be slightly greater in the scaffolds treated with alkali thermochemical treatment. These results suggest that both strategies contribute to enhancing porous metallic implant stability and osteointegration, and a combination of both strategies might be worth pursuing.
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Zheng Y, Xia P, Dong L, Tian L, Tian C. Development and review of a sub-millimeter-sized cell-scale micro-magnetic stimulation device. Biomed Phys Eng Express 2021; 7. [PMID: 34020437 DOI: 10.1088/2057-1976/ac0409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 05/21/2021] [Indexed: 11/12/2022]
Abstract
The development of modern micro-processing technology has led to the design and production of sub-millimeter-sized coils. A novel type of micro-magnetic stimulation (μMS) regulatory technology has widely been researched in recent years. This technology has several advantages, including small size, no contact between tissues and the metal coil, and high spatial resolution. Considering some problems with theμMS control technology in practical applications, different kinds ofμMS devices have been developed, including anin vitrosingle-pointμMS device, anin vivoimplantable single-pointμMs device, a discrete-arrayμMS device, and anin vivoimplantable-arrayμMs device. Given the problems that currently exist in the design and implementation of this device, such as the key problems of structural design, implantation method, experimental safety, and reliability of the device, we review the development process in detail. We also discuss the precise targeting advantage of this device, which is likely to be of great significance for wide-ranging applications of magnetic stimulation technology.
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Affiliation(s)
- Yu Zheng
- School of Life Sciences, Tiangong university, Tianjin 300387, People's Republic of China
| | - Pei Xia
- School of Life Sciences, Tiangong university, Tianjin 300387, People's Republic of China
| | - Lei Dong
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Lei Tian
- School of Life Sciences, Tiangong university, Tianjin 300387, People's Republic of China
| | - Chunxiao Tian
- School of Life Sciences, Tiangong university, Tianjin 300387, People's Republic of China
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Wu N, Liu J, Ma W, Dong X, Wang F, Yang D, Xu Y. Degradable calcium deficient hydroxyapatite/PLGA bilayer scaffold through integral molding 3D printing for bone defect repair. Biofabrication 2020; 13. [PMID: 33202398 DOI: 10.1088/1758-5090/abcb48] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 11/17/2020] [Indexed: 11/12/2022]
Abstract
A novel method was developed for calcium deficient hydroxyapatite (CDHA) scaffold 3D printing, through which a bilayer scaffold was fabricated by integral molding of individual CDHA and PLGA. The hydration reaction of α-TCP was utilized to form CDHA, and a mixed solution of gelatin, glycerine, glutaraldehyde was applied as the dispersant and adhesive. The concentration of the glutaraldehyde (1 ‱(v/v)) and the mixing ratio of α-TCP (0.6, 0.8, 1.0, 1.2(g/mL)) was studied in the effect on the forming ability of the CDHA ink. The influence of α-TCP proportion (0.6, 0.8, 1.0, 1.2 (g/mL)) on the formation of CDHA was also researched in phase analysis, morphology and compressive strength measurements. The CDHA/PLGA bilayer scaffold was fabricated with a good combination of the two components by 3D printing. The in vitro degradation, cytotoxicity, and cell proliferation behavior were studied. Meanwhile the in-vivo performances in terms of surgical safety, biodegradation, and osteogenic capacity were investigated with a cortical bone defect model in a rabbit femur. The results showed that the CDHA/PLGA bilayer scaffold had excellent biocompatibility and no cytotoxicity. The scaffolds were successfully implanted and presented remarkable osteogenic capacity within 6 months through analyses in radiography and histology. In conclusion, the method has a potential clinical application in diverse bone repair practices by varied 3D-printing fabrication.
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Affiliation(s)
- Ning Wu
- Shanghai University of Medicine and Health Sciences, Shanghai, Shanghai, CHINA
| | - Jia Liu
- Changzheng Hospital, Shanghai, Shanghai, CHINA
| | - Weibo Ma
- Shanghai University of Traditional Chinese Medicine, Shanghai, Shanghai, CHINA
| | - Xian Dong
- Shanghai University of Medicine and Health Sciences Affiliated Jia Ding Hospital Shanghai, Shanghai, Shanghai, CHINA
| | - Feng Wang
- Shanghai University of Traditional Chinese Medicine, Shanghai, Shanghai, CHINA
| | - Dicheng Yang
- Shanghai University of Medicine and Health Sciences, Shanghai, CHINA
| | - Yan Xu
- National Engineering Research Center for Nanotechnology, Shanghai, Shanghai, CHINA
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Ashinsky BG, Gullbrand SE, Bonnevie ED, Wang C, Kim DH, Han L, Mauck RL, Smith HE. Sacrificial Fibers Improve Matrix Distribution and Micromechanical Properties in a Tissue-Engineered Intervertebral Disc. Acta Biomater 2020; 111:232-241. [PMID: 32447064 DOI: 10.1016/j.actbio.2020.05.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/13/2020] [Accepted: 05/14/2020] [Indexed: 12/19/2022]
Abstract
Tissue-engineered replacement discs are an area of intense investigation for the treatment of end-stage intervertebral disc (IVD) degeneration. These living implants can integrate into the IVD space and recapitulate native motion segment function. We recently developed a multiphasic tissue-engineered disc-like angle-ply structure (DAPS) that models the micro-architectural and functional features of native tissue. While these implants resulted in functional restoration of the motion segment in rat and caprine models, we also noted deficiencies in cell infiltration and homogeneity of matrix deposition in the electrospun poly(ε-caprolactone) outer region (annulus fibrosus, AF) of the DAPS. To address this limitation, here, we incorporated a sacrificial water-soluble polymer, polyethylene oxide (PEO), as a second fiber fraction within the AF region to increase porosity of the implant. Maturation of these PEO-modified DAPS were evaluated after 5 and 10 weeks of in vitro culture in terms of AF biochemical content, MRI T2 values, overall construct mechanical properties, AF micromechanical properties and cell and matrix distribution. To assess the performance of the PEO-modified DAPS in vivo, precultured constructs were implanted into the rat caudal IVD space for 10 weeks. Results showed that matrix distribution was more homogenous in PCL/PEO DAPS, as evidenced by more robust histological staining, organized collagen deposition and micromechanical properties, compared to standard PCL-only DAPS in vitro. Cell and matrix infiltration were also improved in vivo, but no differences in macromechanical properties and a trend towards improved micromechanical properties were observed. These findings demonstrate that the inclusion of a sacrificial PEO fiber fraction in the DAPS AF region improves cellular colonization, matrix elaboration, and in vitro and in vivo function of an engineered IVD implant. STATEMENT OF SIGNIFICANCE: This work establishes a method for improving cell infiltration and matrix distribution within tissue-engineered dense fibrous scaffolds for intervertebral disc replacement. Tissue-engineered whole disc replacements are an attractive alternative to the current gold standard (mechanical disc arthroplasty or vertebral fusion) for the clinical treatment of patients with advanced disc degeneration.
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Ansari T, Southgate A, Obiri-Yeboa I, Jones LG, Greco K, Olayanju A, Mbundi L, Somasundaram M, Davidson B, Sibbons PD. Development and Characterization of a Porcine Liver Scaffold. Stem Cells Dev 2020; 29:314-326. [PMID: 31854227 DOI: 10.1089/scd.2019.0069] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The growing number of patients requiring liver transplantation for chronic liver disease cannot be currently met due to a shortage in donor tissue. As such, alternative tissue engineering approaches combining the use of acellular biological scaffolds and different cell populations (hepatic or progenitor) are being explored to augment the demand for functional organs. Our goal was to produce a clinically relevant sized scaffold from a sustainable source within 24 h, while preserving the extracellular matrix (ECM) to facilitate cell repopulation at a later stage. Whole porcine livers underwent perfusion decellularization via the hepatic artery and hepatic portal vein using a combination of saponin, sodium deoxycholate, and deionized water washes resulting in an acellular scaffold with an intact vasculature and preserved ECM. Molecular and immunohistochemical analysis (collagen I and IV and laminin) showed complete removal of any DNA material, together with excellent retention of glycosaminoglycans and collagen. Fourier-transform infrared spectroscopy (FTIR) analysis showed both absence of nuclear material and removal of any detergent residue, which was successfully achieved after additional ethanol gradient washes. Samples of the decellularized scaffold were assessed for cytotoxicity by seeding with porcine adipose-derived mesenchymal stem cells in vitro, these cells over a 10-day period showed attachment and proliferation. Perfusion of the vascular tree with contrast media followed by computed tomography (CT) imaging showed an intact vascular network. In vivo implantation of whole intact nonseeded livers, into a porcine model (as auxiliary graft) showed uniform perfusion macroscopically and histologically. Using this method, it is possible to create an acellular, clinically sized, liver scaffold with intact vasculature in less than 24 h.
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Affiliation(s)
- Tahera Ansari
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Aaron Southgate
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Irene Obiri-Yeboa
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Lauren G Jones
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Karin Greco
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Adedamola Olayanju
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Lubinda Mbundi
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Murali Somasundaram
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
| | - Brian Davidson
- Department of Surgery, Royal Free Campus, UCL Medical School, London, United Kingdom
| | - Paul D Sibbons
- Tissue Engineering and Regenerative Medicine, Northwick Park Institute for Medical Research (NPIMR), Harrow, United Kingdom
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Dai Z, Li Y, Lu W, Jiang D, Li H, Yan Y, Lv G, Yang A. In vivo biocompatibility of new nano-calcium-deficient hydroxyapatite/poly-amino acid complex biomaterials. Int J Nanomedicine 2015; 10:6303-16. [PMID: 26504382 PMCID: PMC4605249 DOI: 10.2147/ijn.s90273] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Objective To evaluate the compatibility of novel nano-calcium-deficient hydroxyapatite/poly-amino acid (n-CDHA/PAA) complex biomaterials with muscle and bone tissue in an in vivo model. Methods Thirty-two New Zealand white rabbits were used in this study. Biomaterials were surgically implanted into each rabbit in the back erector spinae and in tibia with induced defect. Polyethylene was implanted into rabbits in the control group and n-CDHA/PAA into those of the experimental group. Animals were examined at four different points in time: 2 weeks, 4 weeks, 12 weeks, and 24 weeks after surgery. They were euthanized after embolization. Back erector spinae muscles with the surgical implants were examined after hematoxylin and eosin (HE) staining at these points in time. Tibia bones with the surgical implants were examined by X-ray and scanning electron microscopy (SEM) at these points in time to evaluate the interface of the bone with the implanted biomaterials. Bone tissues were sectioned and subjected to HE, Masson, and toluidine blue staining. Results HE staining of back erector spinae muscles at 4 weeks, 12 weeks, and 24 weeks after implantation of either n-CDHA/PAA or polyethylene showed disappearance of inflammation and normal arrangement in the peripheral tissue of implant biomaterials; no abnormal staining was observed. At 2 weeks after implantation, X-ray imaging of bone tissue samples in both experimental and control groups showed that the peripheral tissues of the implanted biomaterials were continuous and lacked bone osteolysis, absorption, necrosis, or osteomyelitis. The connection between implanted biomaterials and bone tissue was tight. The results of HE, Masson, toluidine blue staining and SEM confirmed that the implanted biomaterials were closely connected to the bone defect and that no rejection had taken place. The n-CDHA/PAA biomaterials induced differentiation of a large number of chondrocytes. New bone trabecula began to form at 4 weeks after implanting n-CDHA/PAA biomaterials, and lamellar bone gradually formed at 12 weeks and 24 weeks after implantation. Routine blood and kidney function tests showed no significant changes at 2 weeks and 24 weeks after implantation of both biomaterials. Conclusion n-CDHA/PAA composites showed good compatibility in in vivo model. In this study, n-CDHA/PAA were found to be safe, nontoxic, and biologically active in bone repair.
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Affiliation(s)
- Zhenyu Dai
- College of Physical Science and Technology, Sichuan University, Chengdu, People's Republic of China ; Department of Orthopedics, Chongqing Hospital of Traditional Chinese Medicine, Chongqing Medical University, Chongqing, People's Republic of China
| | - Yue Li
- Department of Clinical Laboratory, the Second Affiliated Hospital, Chongqing Medical University, Chongqing, People's Republic of China
| | - Weizhong Lu
- Department of Orthopedics, Chongqing Hospital of Traditional Chinese Medicine, Chongqing Medical University, Chongqing, People's Republic of China
| | - Dianming Jiang
- Department of Orthopedics, the First Affiliated Hospital, Chongqing Medical University, Chongqing, People's Republic of China
| | - Hong Li
- College of Physical Science and Technology, Sichuan University, Chengdu, People's Republic of China
| | - Yonggang Yan
- College of Physical Science and Technology, Sichuan University, Chengdu, People's Republic of China
| | - Guoyu Lv
- College of Physical Science and Technology, Sichuan University, Chengdu, People's Republic of China
| | - Aiping Yang
- College of Physical Science and Technology, Sichuan University, Chengdu, People's Republic of China
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Wang W, Wan P, Liu C, Tan L, Li W, Li L, Yang K. Degradation and biological properties of Ca-P contained micro-arc oxidation self-sealing coating on pure magnesium for bone fixation. Regen Biomater 2014; 2:107-18. [PMID: 26816635 PMCID: PMC4669020 DOI: 10.1093/rb/rbu014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 09/04/2014] [Accepted: 09/20/2014] [Indexed: 11/14/2022] Open
Abstract
Poor corrosion resistance is one of the main disadvantages for biodegradable magnesium-based metals, especially applied for bone fixation, where there is a high demand of bio-mechanical strength and stability. Surface coating has been proved as an effective method to control the in vivo degradation. In this study a Ca-P self-sealing micro-arc oxidation (MAO) coating was studied to verify its efficacy and biological properties by in vitro and in vivo tests. It was found that the MAO coating could effectively retard the degradation according to immersion and electrochemical tests as well as 3D reconstruction by X-ray tomography after implantation. The MAO coating exhibited no toxicity and could stimulate the new bone formation. Therefore, the Ca-P self-sealing MAO coating could be a potential candidate for application of biodegradable Mg-based implant in bone fixations.
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Affiliation(s)
- Weidan Wang
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
| | - Peng Wan
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
| | - Chen Liu
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
| | - Lili Tan
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
| | - Weirong Li
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
| | - Lugee Li
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
| | - Ke Yang
- Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China, EONTEC Co., Ltd, Dongguan, Guangdong, 523662, China
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Al‐Abboodi A, Fu J, Doran PM, Tan TTY, Chan PPY. Injectable 3D hydrogel scaffold with tailorable porosity post-implantation. Adv Healthc Mater 2014; 3:725-36. [PMID: 24151286 DOI: 10.1002/adhm.201300303] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Indexed: 12/28/2022]
Abstract
Since rates of tissue growth vary significantly between tissue types, and also between individuals due to differences in age, dietary intake, and lifestyle-related factors, engineering a scaffold system that is appropriate for personalized tissue engineering remains a significant challenge. In this study, a gelatin-hydroxyphenylpropionic acid/carboxylmethylcellulose-tyramine (Gtn-HPA/CMC-Tyr) porous hydrogel system that allows the pore structure of scaffolds to be altered in vivo after implantation is developed. Cross-linking of Gtn-HPA/CMC-Tyr hydrogels via horseradish peroxidase oxidative coupling is examined both in vitro and in vivo. Post-implantation, further alteration of the hydrogel structure is achieved by injecting cellulase enzyme to digest the CMC component of the scaffold; this treatment yields a structure with larger pores and higher porosity than hydrogels without cellulase injection. Using this approach, the pore sizes of scaffolds are altered in vivo from 32-87 μm to 74-181 μm in a user-controled manner. The hydrogel is biocompatible to COS-7 cells and has mechanical properties similar to those of soft tissues. The new hydrogel system developed in this work provides clinicians with the ability to tailor the structure of scaffolds post-implantation depending on the growth rate of a tissue or an individual's recovery rate, and could thus be ideal for personalized tissue engineering.
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Affiliation(s)
- Aswan Al‐Abboodi
- Department of Chemical Engineering Monash University Clayton 3800 Australia
| | - Jing Fu
- Department of Mechanical & Aerospace Engineering Monash University Clayton 3800 Australia
| | - Pauline M. Doran
- Faculty of Life & Social Sciences Swinburne University of Technology Hawthorn 3122 Australia
| | - Timothy T. Y. Tan
- School of Chemical & Biomedical Engineering Nanyang Technological University 637459 Singapore
| | - Peggy P. Y. Chan
- MicroNanoPhysics Research Laboratory School of Applied Science RMIT University 3000, Australia, Melbourne Centre for Nanofabricaton Australian National Fabrication Facility Clayton 3168 Australia
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Yan J, Sun JF, Chu PK, Han Y, Zhang YM. Bone integration capability of a series of strontium-containing hydroxyapatite coatings formed by micro-arc oxidation. J Biomed Mater Res A 2013; 101:2465-80. [PMID: 23348908 DOI: 10.1002/jbm.a.34548] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 10/23/2012] [Accepted: 11/28/2012] [Indexed: 11/11/2022]
Abstract
Strontium-containing hydroxyapatites (Sr-HA) combine the desirable bone regenerative properties of hydroxyapatites (HA) with anabolic and anti-catabolic effects of strontium cations. In the present work, a series of Sr(y)HA [Sr(y)Ca(10-y)(PO4)6(OH)2; y = 0, 0.5, 1, 2] coatings on titanium are produced by micro-arc oxidation (MAO), and the effects of the in vivo osseointegration ability of the coatings are investigated by using a rabbit model. All samples are subjected to biomechanical, surface elemental, micro-CT and histological analysis after 4 and 12 weeks of healing. The obtained results show that the MAO-formed coatings exhibit a microporous network structure composed of Sr(y)HA/Sr(y)HA-Sr(x)Ca(1-x)TiO3/Sr(x)Ca(1-x)TiO3-TiO2 multilayers, in which the outer Sr(y)HA and intermediate Sr(y)HA-Sr(x)Ca(1-x)TiO3 layers have a nanocrystalline structure. All Sr-HA coated implants induce marked improvements in the behavior of bone formation, quantity and quality of bone tissue around the implants than the control HA implant and in particular, the 20%Sr-HA coating promotes early bone formation as identified by polyfluorochrome sequential labeling. The bone-to-implant contact is increased by 46% (p < 0.05) and the pull-out strength is increased by 103% over the HA group (p < 0.01). Extensive areas of mineralized tissue densely deposit on the 20%Sr-HA coating after biomechanical testing, and the greatest improvement of bone microarchitecture are observed around the 20%Sr-HA implant. The identified biological parameters successfully demonstrate the osteoconductivity of 20%Sr-HA surfaces, which results not only in an acceleration but also an improvement of bone-implant integration. The study demonstrates the immense potential of 20%Sr-HA coatings in dental and orthopedic applications.
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Affiliation(s)
- Jun Yan
- Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, No. 145 West Changle Road, Xi'an 710032, China
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