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Ron T, Leon A, Kafri A, Ashraf A, Na J, Babu A, Banerjee R, Brookbank H, Muddaluri SR, Little KJ, Aghion E, Pixley S. Nerve Regeneration with a Scaffold Incorporating an Absorbable Zinc-2% Iron Alloy Filament to Improve Axonal Guidance. Pharmaceutics 2023; 15:2595. [PMID: 38004574 PMCID: PMC10674795 DOI: 10.3390/pharmaceutics15112595] [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: 10/09/2023] [Revised: 10/30/2023] [Accepted: 11/02/2023] [Indexed: 11/26/2023] Open
Abstract
Peripheral nerve damage that results in lost segments requires surgery, but currently available hollow scaffolds have limitations that could be overcome by adding internal guidance support. A novel solution is to use filaments of absorbable metals to supply physical support and guidance for nerve regeneration that then safely disappear from the body. Previously, we showed that thin filaments of magnesium metal (Mg) would support nerve regeneration. Here, we tested another absorbable metal, zinc (Zn), using a proprietary zinc alloy with 2% iron (Zn-2%Fe) that was designed to overcome the limitations of both Mg and pure Zn metal. Non-critical-sized gaps in adult rat sciatic nerves were repaired with silicone conduits plus single filaments of Zn-2%Fe, Mg, or no metal, with autografts as controls. After seventeen weeks, all groups showed equal recovery of function and axonal density at the distal end of the conduit. The Zn alloy group showed some improvements in early rat health and recovery of function. The alloy had a greater local accumulation of degradation products and inflammatory cells than Mg; however, both metals had an equally thin capsule (no difference in tissue irritation) and no toxicity or inflammation in neighboring nerve tissues. Therefore, Zn-2%Fe, like Mg, is biocompatible and has great potential for use in nervous tissue regeneration and repair.
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Affiliation(s)
- Tomer Ron
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Avi Leon
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Alon Kafri
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
- Nuclear Research Centre-Negev, Beer-Sheva 84190, Israel
| | - Ahmed Ashraf
- College of Medicine, University of Cincinnati, Cincinnati, OH 45267, USA
| | - John Na
- College of Medicine, University of Cincinnati, Cincinnati, OH 45267, USA
| | - Ashvin Babu
- School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Runima Banerjee
- College of Engineering & Applied Sciences, University of Cincinnati, Cincinnati, OH 45221, USA
| | - Hunter Brookbank
- College of Arts & Sciences, University of Cincinnati, Cincinnati, OH 45221, USA
| | | | - Kevin J. Little
- Department of Orthopedic Surgery, College of Medicine, University of Cincinnati, Cincinnati, OH 45267, USA
- Pediatric Hand & Upper Extremity Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Eli Aghion
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Sarah Pixley
- Department of Pharmacology & Systems Physiology, College of Medicine, University of Cincinnati, Cincinnati, OH 45267, USA
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Wu M, Xun M, Chen Y. Adaptation of Vascular Smooth Muscle Cell to Degradable Metal Stent Implantation. ACS Biomater Sci Eng 2023. [PMID: 37364226 DOI: 10.1021/acsbiomaterials.3c00637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Iron-, magnesium-, or zinc-based metal vessel stents support vessel expansion at the period early after implantation and degrade away after vascular reconstruction, eliminating the side effects due to the long stay of stent implants in the body and the risks of restenosis and neoatherosclerosis. However, emerging evidence has indicated that their degradation alters the vascular microenvironment and induces adaptive responses of surrounding vessel cells, especially vascular smooth muscle cells (VSMCs). VSMCs are highly flexible cells that actively alter their phenotype in response to the stenting, similarly to what they do during all stages of atherosclerosis pathology, which significantly influences stent performance. This Review discusses how biodegradable metal stents modify vascular conditions and how VSMCs respond to various chemical, biological, and physical signals attributable to stent implantation. The focus is placed on the phenotypic adaptation of VSMCs and the clinical complications, which highlight the importance of VSMC transformation in future stent design.
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Affiliation(s)
- Meichun Wu
- Hengyang Medical School, University of South China, Hengyang, Hunan 410001, China
- School of Nursing, University of South China, Hengyang, Hunan 410001, China
| | - Min Xun
- Institute of Pharmacy and Pharmacology, School of Pharmaceutical Science, University of South China, Hengyang, Hunan 410001, China
| | - Yuping Chen
- Hengyang Medical School, University of South China, Hengyang, Hunan 410001, China
- Institute of Pharmacy and Pharmacology, School of Pharmaceutical Science, University of South China, Hengyang, Hunan 410001, China
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3
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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] [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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4
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Seetharaman S, Sankaranarayanan D, Gupta M. Magnesium-Based Temporary Implants: Potential, Current Status, Applications, and Challenges. J Funct Biomater 2023; 14:324. [PMID: 37367288 DOI: 10.3390/jfb14060324] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/10/2023] [Accepted: 06/13/2023] [Indexed: 06/28/2023] Open
Abstract
Biomedical implants are important devices used for the repair or replacement of damaged or diseased tissues or organs. The success of implantation depends on various factors, such as mechanical properties, biocompatibility, and biodegradability of the materials used. Recently, magnesium (Mg)-based materials have emerged as a promising class of temporary implants due to their remarkable properties, such as strength, biocompatibility, biodegradability, and bioactivity. This review article aims to provide a comprehensive overview of current research works summarizing the above-mentioned properties of Mg-based materials for use as temporary implants. The key findings from in-vitro, in-vivo, and clinical trials are also discussed. Further, the potential applications of Mg-based implants and the applicable fabrication methods are also reviewed.
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Affiliation(s)
- Sankaranarayanan Seetharaman
- Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA #07-08, Singapore 117575, Singapore
- Advanced Remanufacturing and Technology Centre (ARTC), Agency for Science, Technology and Research (A*STAR), 3 Cleantech Loop, #01/01 CleanTech Two, Singapore 637143, Singapore
| | - Dhivya Sankaranarayanan
- Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA #07-08, Singapore 117575, Singapore
| | - Manoj Gupta
- Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, Block EA #07-08, Singapore 117575, Singapore
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Vaghefinazari B, Wierzbicka E, Visser P, Posner R, Arrabal R, Matykina E, Mohedano M, Blawert C, Zheludkevich M, Lamaka S. Chromate-Free Corrosion Protection Strategies for Magnesium Alloys-A Review: PART I-Pre-Treatment and Conversion Coating. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8676. [PMID: 36500170 PMCID: PMC9736347 DOI: 10.3390/ma15238676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 11/10/2022] [Accepted: 11/24/2022] [Indexed: 05/02/2023]
Abstract
Corrosion protection systems based on hexavalent chromium are traditionally perceived to be a panacea for many engineering metals including magnesium alloys. However, bans and strict application regulations attributed to environmental concerns and the carcinogenic nature of hexavalent chromium have driven a considerable amount of effort into developing safer and more environmentally friendly alternative techniques that provide the desired corrosion protection performance for magnesium and its alloys. Part I of this review series considers the various pre-treatment methods as the earliest step involved in the preparation of Mg surfaces for the purpose of further anti-corrosion treatments. The decisive effect of pre-treatment on the corrosion properties of both bare and coated magnesium is discussed. The second section of this review covers the fundamentals and performance of conventional and state-of-the-art conversion coating formulations including phosphate-based, rare-earth-based, vanadate, fluoride-based, and LDH. In addition, the advantages and challenges of each conversion coating formulation are discussed to accommodate the perspectives on their application and future development. Several auspicious corrosion protection performances have been reported as the outcome of extensive ongoing research dedicated to the development of conversion coatings, which can potentially replace hazardous chromium(VI)-based technologies in industries.
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Affiliation(s)
- Bahram Vaghefinazari
- Institute of Surface Science, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
| | - Ewa Wierzbicka
- Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Department of Functional Materials and Hydrogen Technology, Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego Street, 00-908 Warsaw, Poland
| | | | - Ralf Posner
- Henkel AG & Co., KGaA, 40589 Düsseldorf, Germany
| | - Raúl Arrabal
- Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Endzhe Matykina
- Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Marta Mohedano
- Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Carsten Blawert
- Institute of Surface Science, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
| | - Mikhail Zheludkevich
- Institute of Surface Science, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
| | - Sviatlana Lamaka
- Institute of Surface Science, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
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Bian D, Chu X, Xiao J, Tong Z, Huang H, Jia Q, Liu J, Li W, Yu H, He Y, Ma L, Wang X, Li M, Yang T, Huang W, Zhang C, Yao M, Zhang Y, Xu Z, Guan S, Zheng Y. Design of single-phased magnesium alloys with typically high solubility rare earth elements for biomedical applications: Concept and proof. Bioact Mater 2022; 22:180-200. [PMID: 36246664 PMCID: PMC9531051 DOI: 10.1016/j.bioactmat.2022.09.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 09/15/2022] [Accepted: 09/16/2022] [Indexed: 11/07/2022] Open
Abstract
Rare earth elements (REEs) have been long applied in magnesium alloys, among which the mischmetal-containing WE43 alloy has already got the CE mark approval for clinical application. A considerable amount of REEs (7 wt%) is needed in that multi-phased alloy to achieve a good combination of mechanical strength and corrosion resistance. However, the high complex RE addition accompanied with multiple second phases may bring the concern of biological hazards. Single-phased Mg-RE alloys with simpler compositions were proposed to improve the overall performance, i.e., “Simpler alloy, better performance”. The single-phased microstructure can be successfully obtained with typical high-solubility REEs (Ho, Er or Lu) through traditional smelting, casting and extrusion in a wide compositional range. A good corrosion resistance with a macroscopically uniform corrosion mode was guaranteed by the homogeneously single-phased microstructure. The bimodal-grained structure with plenty of sub-grain microstructures allow us to minimize the RE addition to <1 wt%, without losing mechanical properties. The single-phased Mg-RE alloys show comparable mechanical properties to the clinically-proven Mg-based implants. They exhibited similar in-vitro and in-vivo performances (without local or systematic toxicity in SD-rats) compared to a high purity magnesium. In addition, metal elements in our single-phased alloys can be gradually excreted through the urinary system and digestive system, showing no consistent accumulation of RE in main organs, i.e., less burden on organs. The novel concept in this study focuses on the simplification of Mg-RE based alloys for biomedical purpose, and other biodegradable metals with single-phased microstructures are expected to be explored. A concept of developing single-phased biodegradable magnesium alloys was proposed. Single-phased magnesium alloys with bimodal-grained structures were obtained. Good strength and corrosion resistance synergy was achieved in the alloys. Significantly reduced rare earth addition is beneficial to the biocompatibility. Simpler alloy helps to lower the possible biological risks of Mg related implants.
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Affiliation(s)
- Dong Bian
- Medical Research Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xiao Chu
- Medical Research Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Jin Xiao
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Zhipei Tong
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - He Huang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Qinggong Jia
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Jianing Liu
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China
| | - Wenting Li
- School of Materials Science and Engineering, Peking University, Beijing, 100871, China
| | - Hui Yu
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Yue He
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Limin Ma
- Medical Research Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xiaolan Wang
- Medical Research Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Mei Li
- Medical Research Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Tao Yang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Wenhan Huang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Chi Zhang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Mengyu Yao
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Yu Zhang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
- Co-corresponding author.
| | - Zhigang Xu
- ERC for Revolutionizing Metallic Biomaterials, North Carolina A&T State University, Greensboro, NC, 27411, USA
- Co-corresponding author.
| | - Shaokang Guan
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
- Corresponding author.
| | - Yufeng Zheng
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
- School of Materials Science and Engineering, Peking University, Beijing, 100871, China
- Corresponding authors. Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.
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Sommer NG, Hirzberger D, Paar L, Berger L, Ćwieka H, Schwarze UY, Herber V, Okutan B, Bodey AJ, Willumeit-Römer R, Zeller-Plumhoff B, Löffler JF, Weinberg AM. Implant degradation of low-alloyed Mg-Zn-Ca in osteoporotic, old and juvenile rats. Acta Biomater 2022; 147:427-438. [PMID: 35644328 DOI: 10.1016/j.actbio.2022.05.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/27/2022] [Accepted: 05/23/2022] [Indexed: 11/27/2022]
Abstract
Implant removal is unnecessary for biodegradable magnesium (Mg)-based implants and, therefore, the related risk for implant-induced fractures is limited. Aging, on the other hand, is associated with low bone-turnover and decreased bone mass and density, and thus increased fracture risk. Osteoporosis is accompanied by Mg deficiency, therefore, we hypothesized that Mg-based implants may support bone formation by Mg2+ ion release in an ovariectomy-induced osteoporotic rat model. Hence, we investigated osseointegration and implant degradation of a low-alloyed, degrading Mg-Zn-Ca implant (ZX00) in ovariectomy-induced osteoporotic (Osteo), old healthy (OH), and juvenile healthy (JH) groups of female Sprague Dawley rats via in vivo micro-computed tomography (µCT). For the Osteo rats, we demonstrate diminished trabecular bone already after 8 weeks upon ovariectomy and significantly enhanced implant volume loss, with correspondingly pronounced gas formation, compared to the OH and JH groups. Sclerotic rim development was observed in about half of the osteoporotic rats, suggesting a prevention from foreign-body and osteonecrosis development. Synchrotron radiation-based µCT confirmed lower bone volume fractions in the Osteo group compared to the OH and JH groups. Qualitative histological analysis additionally visualized the enhanced implant degradation in the Osteo group. To date, ZX00 provides an interesting implant material for young and older healthy patients, but it may not be of advantage in pharmacologically untreated osteoporotic conditions. STATEMENT OF SIGNIFICANCE: Magnesium-based implants are promising candidates for treatment of osteoporotic fractures because of their biodegradable, biomechanical, anti-bacterial and bone regenerative properties. Here we investigate magnesium‒zinc‒calcium implant materials in a rat model with ovariectomy-induced osteoporosis (Osteo group) and compare the related osseointegration and implant degradation with the results obtained for old healthy (OH) and juvenile healthy (JH) rats. The work applied an appropriate disease model for osteoporosis and focused in particular on long-term implant degradation for different bone conditions. Enhanced implant degradation and sclerotic rim formation was observed in osteoporotic rats, which illustrates that the setting of different bone models generates significantly modified clinical outcome. It further illustrated that these differences must be taken into account in future biodegradable implant development.
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Gonzalez J, Lamaka SV, Mei D, Scharnagl N, Feyerabend F, Zheludkevich ML, Willumeit‐Römer R. Mg Biodegradation Mechanism Deduced from the Local Surface Environment under Simulated Physiological Conditions. Adv Healthc Mater 2021; 10:e2100053. [PMID: 34050703 DOI: 10.1002/adhm.202100053] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 04/18/2021] [Indexed: 11/07/2022]
Abstract
Although certified magnesium-based implants are launched some years ago, the not well-defined Mg degradation mechanism under physiological conditions makes it difficult to standardize its use as a degradable biomaterial for a wide range of implant applications. Among other variables influencing the Mg degradation mechanism, monitoring the pH in the corrosive solution and, especially, at the corroding interface is important due to its direct relation with the formation and stability of the degradation products layer. The interface pH (pH at the Mg/solution interface) developed on Mg-2Ag and E11 alloys are studied in situ during immersion under dynamic conditions (1.5 mL min-1 ) in HBSS with and without the physiological amount of Ca2+ cations (2.5 × 10-3 m). The results show that the precipitation/dissolution of amorphous phosphate-containing phases, that can be associated with apatitic calcium-phosphates Ca10- x (PO4 )6- x (HPO4 or CO3 )x (OH or ½ CO3 )2- x with 0 ≤ x ≤ 2 (Ap-CaP), promoted in the presence of Ca2+ generates an effective local pH buffering system at the surface. Thus, high alkalinization is prevented, and the interface pH is stabilized in the range of 7.6 to 8.5.
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Affiliation(s)
- Jorge Gonzalez
- Institute of Metallic Biomaterials Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
| | - Sviatlana V. Lamaka
- Institute of Surface Science Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
| | - Di Mei
- Institute of Surface Science Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy Zhengzhou University Zhengzhou 450001 P. R. China
| | - Nico Scharnagl
- Institute of Surface Science Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
| | - Frank Feyerabend
- Institute of Metallic Biomaterials Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
| | - Mikhail L. Zheludkevich
- Institute of Surface Science Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
- Institute for Materials Science Faculty of Engineering Kiel University Kiel D‐24143 Germany
| | - Regine Willumeit‐Römer
- Institute of Metallic Biomaterials Helmholtz‐Zentrum Hereon Geesthacht 21502 Germany
- Institute for Materials Science Faculty of Engineering Kiel University Kiel D‐24143 Germany
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Li J, Zhou P, Wang L, Hou Y, Zhang X, Zhu S, Guan S. Investigation of Mg-xLi-Zn alloys for potential application of biodegradable bone implant materials. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2021; 32:43. [PMID: 33825086 PMCID: PMC8024228 DOI: 10.1007/s10856-021-06516-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 03/18/2021] [Indexed: 06/12/2023]
Abstract
Implant therapy after osteosarcoma surgery is a major clinical challenge currently, especially the requirements for mechanical properties, degradability of the implants, and their inhibition of residual tumor cells. Biodegradable magnesium (Mg) alloy as medical bone implant material has full advantages and huge potential development space. Wherein, Mg-lithium (Li) based alloy, as an ultra-light alloy, has good properties for implants under certain conditions, and both Mg and Li have inhibitory effects on tumor cells. Therefore, Mg-Li alloy is expected to be applied in bone implant materials for mechanical supporting and inhibiting tumor cells simultaneously. In this contribution, the Mg-xLi-Zinc (Zn) series alloys (x = 3 wt%, 6 wt%, 9 wt%) were prepared to study the influence of different elements and contents on the structure and properties of the alloy, and the biosafety of the alloy was also evaluated. Our data showed that the yield strength, tensile strength, and elongation of as-cast Mg-xLi-Zn alloy were higher than those of as-cast Mg-Zn alloy; Mg-xLi-Zn alloy can kill osteosarcoma cells (MG-63) in a concentration-dependent manner, wherein Mg-3Li-Zn alloy (x = 3 wt%) and Mg-6Li-Zn alloy (x = 6 wt%) promoted the proliferation of osteoblasts (MC3T3) at a certain concentration of Li. In summary, our study demonstrated that the Mg-6Li-Zn alloy could be potentially applied as a material of orthopedic implant for its excellent multi-functions.
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Affiliation(s)
- Jingan Li
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China
| | - Panyu Zhou
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China
| | - Liguo Wang
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China.
| | - Yachen Hou
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China
| | - Xueqi Zhang
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China
| | - Shijie Zhu
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China.
| | - Shaokang Guan
- School of Materials Science and Engineering & Henan Key Laboratory of Advanced Magnesium Alloy & Key Laboratory of Materials Processing and Mold Technology (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, China.
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10
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Bian D, Zhou X, Liu J, Li W, Shen D, Zheng Y, Gu W, Jiang J, Li M, Chu X, Ma L, Wang X, Zhang Y, Leeflang S, Zhou J. Degradation behaviors and in-vivo biocompatibility of a rare earth- and aluminum-free magnesium-based stent. Acta Biomater 2021; 124:382-397. [PMID: 33508506 DOI: 10.1016/j.actbio.2021.01.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 01/14/2021] [Accepted: 01/19/2021] [Indexed: 12/14/2022]
Abstract
Biodegradable stents can provide scaffolding and anti-restenosis benefits in the short term and then gradually disappear over time to free the vessel, among which the Mg-based biodegradable metal stents have been prosperously developed. In the present study, a Mg-8.5Li (wt.%) alloy (RE- and Al-free) with high ductility (> 40%) was processed into mini-tubes, and further fabricated into finished stent through laser cutting and electropolishing. In-vitro degradation test was performed to evaluate the durability of this stent before and after balloon dilation. The influence of plastic deformation and residual stress (derived from the dilation process) on the degradation was checked with the assistance of finite element analysis. In addition, in-vivo degradation behaviors and biocompatibility of the stent were evaluated by performing implantation in iliac artery of minipigs. The balloon dilation process did not lead to deteriorated degradation, and this stent exhibited a decent degradation rate (0.15 mm/y) in vitro, but divergent result (> 0.6 mm/y) was found in vivo. The stent was almost completely degraded in 3 months, revealing an insufficient scaffolding time. Meanwhile, it did not induce possible thrombus, and it was tolerable by surrounding tissues in pigs. Besides, endothelial coverage in 1 month was achieved even under the severe degradation condition. In the end, the feasibility of this stent for treatment of benign vascular stenosis was generally discussed, and perspectives on future improvement of Mg-Li-based stents were proposed.
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Affiliation(s)
- Dong Bian
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xiaochen Zhou
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Jianing Liu
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China
| | - Wenting Li
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Danni Shen
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Yufeng Zheng
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China; Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China; Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.
| | - Wenda Gu
- Department of Cardiac Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Jingjun Jiang
- Department of Vascular Surgery, Peking University People's Hospital, Beijing, 100044, China
| | - Mei Li
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xiao Chu
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Limin Ma
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xiaolan Wang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Yu Zhang
- Department of Orthopedics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Sander Leeflang
- Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, Netherlands
| | - Jie Zhou
- Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, Netherlands
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11
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Zhang Y, Huang Y, Feyerabend F, Blawert C, Gan W, Maawad E, You S, Gavras S, Scharnagl N, Bode J, Vogt C, Zander D, Willumeit-Römer R, Kainer KU, Hort N. Influence of the amount of intermetallics on the degradation of Mg-Nd alloys under physiological conditions. Acta Biomater 2021; 121:695-712. [PMID: 33279710 DOI: 10.1016/j.actbio.2020.11.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/04/2020] [Accepted: 11/29/2020] [Indexed: 12/16/2022]
Abstract
The influence of amount of intermetallics on the degradation of as-extruded Mg-Nd alloys with different contents of Nd was investigated via immersion testing in DMEM+10% FBS under cell culture conditions and subsequent microstructural characterizations. It is found that the presence of intermetallic particles Mg41Nd5 affects the corrosion of Mg-Nd alloys in two conflicting ways. One is their negative role that their existence enhances the micro-galvanic corrosion. Another is their positive role. Their existence favours the formation of a continuous and compact corrosion layer. At the early stage of immersion, their negative role predominated. The degradation rate of Mg-Nd alloys monotonously increases with increasing the amount of intermetallics. Mg-5Nd alloy with maximum amount of intermetallics suffered from the most severe corrosion. With the immersion proceeding (≥7 days), then the positive role of these intermetallic particles Mg41Nd5 could not be neglected. Owing to the interaction between their positive and negative roles, at the later stage of immersion the corrosion rate of Mg-Nd alloys first increases with increasing the content of Nd, then reaches to the maximum at 2 wt. % Nd. With a further increase of Nd content, a decrease in corrosion rate occurs. The main corrosion products on the surfaces of Mg-Nd alloys include carbonates, calcium-phosphate, neodymium oxide and/or neodymium hydroxide. They are amorphous at the early stage of immersion. With the immersion proceeding, they are transformed to crystalline. The existence of undegradable Mg41Nd5 particles in the corrosion layer can enhance the crystallization of such amorphous corrosion products.
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12
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Zhang W, Li P, Neumann B, Haag H, Li M, Xu Z, Zhou C, Scheideler L, Wendel HP, Zhang H, Geis-Gerstorfer J, Wan G. Chandler-Loop surveyed blood compatibility and dynamic blood triggered degradation behavior of Zn-4Cu alloy and Zn. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 119:111594. [PMID: 33321638 DOI: 10.1016/j.msec.2020.111594] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 09/16/2020] [Accepted: 09/30/2020] [Indexed: 12/16/2022]
Abstract
Zinc (Zn) and its alloys have been considered promising absorbable metals for medical implants. However, the dynamic interaction between Zn-based materials and human blood after implantation remains unclear. In this study, a modified Chandler-Loop system was applied to assess the blood compatibility and initial degradation behavior of a Zn-4.0Cu (wt%) alloy (Zn-4Cu) and Zn with human peripheral blood under circulation conditions. In this dynamic in vitro model, the Zn-4Cu and Zn showed sufficient blood compatibility. The numbers of erythrocytes, platelets, and leukocytes were not significantly altered, and appropriate activations of the coagulation and complement system were observed. Concerning initial degradation behavior, the product layers formed on the surfaces comprise a mixture of organic and inorganic compounds while the inorganic constituents decrease toward the outer surface. Considering the corrosion morphology and electrochemical behaviors, Zn-4Cu exhibited milder and more uniform degradation than Zn. Additionally, long-term degradation tests of 28 days in human peripheral blood, human serum, and Dulbecco's phosphate-buffered saline (DPBS) demonstrated that the Zn-4Cu showed relatively uniform degradation in blood and serum. On the contrary, in DPBS, severe localized corrosion appeared along the grain boundary of the secondary phase, which was likely attributed to the acceleration of galvanic corrosion. The Zn was found with localized corrosion impeded in the blood albeit with apparently developed deep pitting holes in the serum and DPBS.
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Affiliation(s)
- Wentai Zhang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Ping Li
- Section Medical Materials Science and Technology, University Hospital Tübingen, Osianderstr. 2-8, Tübingen 72076, Germany
| | - Bernd Neumann
- Department of Cardiovascular Surgery, Clinical Research Laboratory, University Hospital Tübingen, Calwerstr. 7/1, Tübingen 72076, Germany
| | - Hanna Haag
- Department of Cardiovascular Surgery, Clinical Research Laboratory, University Hospital Tübingen, Calwerstr. 7/1, Tübingen 72076, Germany
| | - Ming Li
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Zeqian Xu
- Section Medical Materials Science and Technology, University Hospital Tübingen, Osianderstr. 2-8, Tübingen 72076, Germany
| | - Chao Zhou
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Lutz Scheideler
- Section Medical Materials Science and Technology, University Hospital Tübingen, Osianderstr. 2-8, Tübingen 72076, Germany
| | - Hans-Peter Wendel
- Department of Cardiovascular Surgery, Clinical Research Laboratory, University Hospital Tübingen, Calwerstr. 7/1, Tübingen 72076, Germany
| | - Haijun Zhang
- Department of Interventional and Vascular Surgery, The Tenth People's Hospital of Shanghai, Tongji University, Shanghai 200072, China; National United Engineering Laboratory for Biomedical Material Modification, Branden Industrial Park, Qihe Economic & Development Zone, Dezhou, Shandong 251100, China.
| | - Jürgen Geis-Gerstorfer
- Section Medical Materials Science and Technology, University Hospital Tübingen, Osianderstr. 2-8, Tübingen 72076, Germany.
| | - Guojiang Wan
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
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13
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Holweg P, Berger L, Cihova M, Donohue N, Clement B, Schwarze U, Sommer NG, Hohenberger G, van den Beucken JJ, Seibert F, Leithner A, Löffler JF, Weinberg AM. A lean magnesium-zinc-calcium alloy ZX00 used for bone fracture stabilization in a large growing-animal model. Acta Biomater 2020; 113:646-659. [PMID: 32553919 DOI: 10.1016/j.actbio.2020.06.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/04/2020] [Accepted: 06/09/2020] [Indexed: 12/15/2022]
Abstract
Over the last decade, demand has increased for developing new, alternative materials in pediatric trauma care to overcome the disadvantages associated with conventional implant materials. Magnesium (Mg)-based alloys seem to adequately fulfill the vision of a homogeneously resorbable, biocompatible, load-bearing and functionally supportive implant. The aim of the present study is to introduce the high-strength, lean alloy Mg‒0.45Zn‒0.45Ca, in wt% (ZX00), and for the first time investigate the clinical applicability of screw osteosynthesis using this alloy that contains no rare-earth elements. The alloy was applied in a growing sheep model with osteotomized bone (simulating a fracture) and compared to a non-osteotomy control group regarding degradation behavior and fracture healing. The alloy exhibits an ultimate tensile strength of 285.7 ± 3.1 MPa, an elongation at fracture of 18.2 ± 2.1%, and a reduced in vitro degradation rate compared to alloys containing higher amounts of Zn. In vivo, no significant difference between the osteotomized bone and the control group was found regarding the change in screw volume over implantation time. Therefore, it can be concluded that the fracture healing process, including its effects on the surrounding area, has no significant influence on degradation behavior. There was also no negative influence from hydrogen-gas formation on fracture healing. Despite the proximal and distal screws showing chronologically different gas release, the osteotomy showed complete consolidation. STATEMENT OF SIGNIFICANCE: Conventional implants involve several disadvantages in pediatric trauma care. Magnesium-based alloys seem to overcome these issues as discussed in the recent literature. This study evaluates the clinical applicability of high-strength lean Mg‒0.45Zn‒0.45Ca (ZX00) screws in a growing-sheep model. Two groups, one including a simulated fracture and one group without fracture, underwent implantation of the alloy and were compared to each other. No significant difference regarding screw volume was observed between the groups. There was no negative influence of hydrogen-gas formation on fracture healing and a complete fracture consolidation was found after 12 weeks for all animals investigated.
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14
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Gao M, Na D, Ni X, Song L, Etim IP, Yang K, Tan L, Ma Z. The mechanical property and corrosion resistance of Mg-Zn-Nd alloy fine wires in vitro and in vivo. Bioact Mater 2020; 6:55-63. [PMID: 32817913 PMCID: PMC7419589 DOI: 10.1016/j.bioactmat.2020.07.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/20/2020] [Accepted: 07/20/2020] [Indexed: 01/12/2023] Open
Abstract
Titanium and its alloy are commonly used as surgical staples in the reconstruction of intestinal tract and stomach, however they cannot be absorbed in human body, which may cause a series of complications to influence further diagnosis. Magnesium and its alloy have great potential as surgical staples, because they can be degraded in human body and have good mechanical properties and biocompatibility. In this study, Mg-2Zn-0.5Nd (ZN20) alloy fine wires showed great potential as surgical staples. The ultimate tensile strength and elongation of ZN20 alloy fine wires were 248 MPa and 13%, respectively, which could be benefit for the deformation of the surgical staples from U-shape to B-shape. The bursting pressure of the wire was about 40 kPa, implying that it can supply sufficient mechanical support after anastomosis. Biochemical test and histological analysis illustrated good biocompatibility and biological safety of ZN20 alloy fine wire. The residual tensile stress formed on the outside of ZN20 fine wire during drawing would accelerate the corrosion. The second phase had a negative influence on corrosion property due to galvanic corrosion. The corrosion rate in vitro was faster than that in vivo due to the capsule formed on the surface of ZN20 alloy fine wire. The mechanical property of ZN20 wire can ensure the anastomosis smoothly. Peeling of was the mainly corrosion behavior of ZN20 wire in simulated intestinal fluid. The attachment of fibroblasts and macrophages caused corrosion rate in vivo decrease.
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Affiliation(s)
- Ming Gao
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China.,Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Di Na
- The First Hospital of China Medical University, Department of Surgical Oncology, China
| | - Xiangqiao Ni
- The First Hospital of China Medical University, Department of Surgical Oncology, China
| | - Lihui Song
- The First Hospital of China Medical University, Department of Surgical Oncology, China
| | - Iniobong P Etim
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China.,Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Ke Yang
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Lili Tan
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Zheng Ma
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
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15
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A biodegradable Zn-1Cu-0.1Ti alloy with antibacterial properties for orthopedic applications. Acta Biomater 2020; 106:410-427. [PMID: 32068137 DOI: 10.1016/j.actbio.2020.02.017] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 01/19/2020] [Accepted: 02/11/2020] [Indexed: 01/24/2023]
Abstract
Zinc (Zn) alloys are receiving increasing attention in the field of biodegradable implant materials due to their unique combination of suitable biodegradability and good biological functionalities. However, the currently existing industrial Zn alloys are not necessarily biocompatible, nor sufficiently mechanically strong and wear-resistant. In this study, a Zn-1Cu-0.1Ti alloy is developed with enhanced mechanical strength, corrosion wear property, biocompatibility, and antibacterial ability for biodegradable implant material applications. HR and HR + CR were performed on the as-cast alloy and its microstructure, mechanical properties, frictional and wear behaviors, corrosion resistance, in vitro cytocompatibility, and antibacterial ability were systematically assessed. The microstructures of the Zn-1Cu-0.1Ti alloy after different deformation conditions included a η-Zn phase, a ε-CuZn5 phase, and an intermetallic phase of TiZn16. The HR+CR sample of Zn-1Cu-0.1Ti exhibited a yield strength of 204.2 MPa, an ultimate tensile strength of 249.9 MPa, and an elongation of 75.2%; significantly higher than those of the HR alloy and the AC alloy. The degradation rate in Hanks' solution was 0.029 mm/y for the AC alloy, 0.032 mm/y for the HR+CR alloy, and 0.034 mm/y for the HR alloy. The HR Zn-1Cu-0.1Ti alloy showed the best wear resistance, followed by the AC alloy and the alloy after HR + CR. The extract of the AC Zn-1Cu-0.1Ti alloy showed over 80% cell viability with MC3T3-E1 pre-osteoblast and MG-63 osteosarcoma cells at a concentration of ≤ 25%. The as-cast Zn-1Cu-0.1Ti alloy showed good blood compatibility and antibacterial ability. STATEMENT OF SIGNIFICANCE: This work repots a Zn-1Cu-0.1Ti alloy with enhanced mechanical strength, corrosion wear property, biocompatibility, and antibacterial ability for biodegradable implant applications. Our findings showed that Zn-1Cu-0.1Ti after hot-rolling plus cold-rolling exhibited a yield strength of 204.2 MPa, an ultimate tensile strength of 249.9 MPa, an elongation of 75.2%, and a degradation rate of 0.032 mm/y in Hanks' Solution. The hot-rolled Zn-1Cu-0.1Ti showed the best wear resistance. The extract of the as-cast alloy at a concentration of ≤ 25% showed over 80% cell viability with MC3T3-E1 and MG-63 cells. The Zn-1Cu-0.1Ti alloy showed good hemocompatibility and antibacterial ability.
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16
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Witte F. Biodegradable Metals. Biomater Sci 2020. [DOI: 10.1016/b978-0-12-816137-1.00021-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Hou RQ, Scharnagl N, Willumeit-Römer R, Feyerabend F. Different effects of single protein vs. protein mixtures on magnesium degradation under cell culture conditions. Acta Biomater 2019; 98:256-268. [PMID: 30771533 DOI: 10.1016/j.actbio.2019.02.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 01/09/2019] [Accepted: 02/08/2019] [Indexed: 02/07/2023]
Abstract
Bovine serum albumin (BSA) or fetal bovine serum (FBS), as the protein component, is usually added into solution to study the influence of proteins on Mg degradation. However, the specific character of proteins used and the interaction between organic molecules in FBS do not draw enough attention. This study investigated the influence of BSA, fibrinogen (Fib) and FBS on Mg degradation in Hanks' balanced salt solution without (HBSS) or with calcium (HBSSCa) and Dulbecco's modified eagle medium Glutamax-I (DMEM). The results reveal that the effect of BSA, Fib and FBS on the degradation rate of Mg is time- and media-dependent, as a result of the overlap of protein adsorption, binding/chelating to ions and interaction between organic molecules. The binding/chelating of proteins and/or the possible effect of proteins on the kinetics of products formation lead to the formation of different degradation precipitates on Mg surface in HBSS. The interaction between proteins and Ca2+/PO43- accelerates the formation of Ca-P salts in HBSSCa and DMEM, thereby impeding the degradation of Mg. Moreover, the interplay between organic molecules and the specific character of proteins are highlighted by the cooperative (in media + FBS) or competitive (in DMEM + BSA + Fib) effect of proteins in the presence of more kinds of proteins and the different effect of BSA and Fib on the degradation of Mg. Therefore, the addition of proteins to testing medium is necessary for in vitro tests and DMEM + 10% FBS is recommended as the in vitro testing medium to present an in vivo-like degradation for Mg. STATEMENT OF SIGNIFICANCE: The present study emphasizes the difference between proteins, and the difference between single protein and protein mixture in view of the effect on Mg degradation. The results highlight the importance of the interaction between proteins in media, which can increase or decrease the degradation of Mg compared to the single protein. It can aid other researchers to understand the effect of proteins on Mg degradation and to pay more attention to the interaction of organic molecules on Mg degradation when more kinds of organic molecules are used in medium, especially for FBS. The submitted work could be of significant importance to other researchers working in the related fields, thus appealing to the readers of Acta Biomaterialia.
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18
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Hong D, Zaky SH, Chong R, Lukashova L, Beniash E, Verdelis K, Witte F, Sfeir C. Controlling magnesium corrosion and degradation-regulating mineralization using matrix GLA protein. Acta Biomater 2019; 98:142-151. [PMID: 31330328 DOI: 10.1016/j.actbio.2019.05.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 05/10/2019] [Accepted: 05/19/2019] [Indexed: 01/07/2023]
Abstract
Magnesium (Mg) alloys are embraced for their biodegradability and biocompatibility. However, Mg degrades spontaneously in the biological environment in vivo and in vitro, triggering deposition of calcium phosphate on the metal. Upon complete metal absorption, minerals remain in the tissue, which could lead to pathogenic calcification. Hence, our aims are to test the feasibility of matrix GLA protein (MGP) to locally inhibit Mg mineralization that is induced by metal alloy degradation. MGP is a small secretory protein that has been shown to inhibit soft tissue calcification. We exposed Mg to MGP, stably transfected into mammalian cells. Results showed that less calcium and phosphorous deposition on the Mg surface when MGP was present relative to when it was not. In the in vivo mouse intramuscular model conducted for 4 and 6 weeks, Mg rods were embedded in collagen scaffolds, seeded with cells overexpressing MGP. Microtomography, electron dispersive x-ray spectroscopy, and histology assessments revealed lower deposited mineral volume around Mg rods from the MGP group. Compared to other groups, higher volume loss after implantation was observed from the MGP group at both time points, indicating a higher corrosion rate without the protective mineral layer. This study is the first to our knowledge to demonstrate that local exposure to a biomolecule, such as MGP, can modulate the corrosion of Mg-based implants. These findings may have important implications for the future design of endovascular stents and orthopedic devices.
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Affiliation(s)
- Dandan Hong
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, PA, USA
| | - Samer H Zaky
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, PA, USA
| | - Rong Chong
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Lyudmila Lukashova
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Elia Beniash
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, PA, USA
| | - Konstantinos Verdelis
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Frank Witte
- The McGowan Institute for Regenerative Medicine, University of Pittsburgh, PA, USA; Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité - Universitätsmedizin Berlin, Aßmannshauser Straße 4-6, 14197 Berlin, Germany
| | - Charles Sfeir
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Periodontics and Preventive Dentistry, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, PA, USA.
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19
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Amano H, Hanada K, Hinoki A, Tainaka T, Shirota C, Sumida W, Yokota K, Murase N, Oshima K, Chiba K, Tanaka Y, Uchida H. Biodegradable Surgical Staple Composed of Magnesium Alloy. Sci Rep 2019; 9:14671. [PMID: 31604974 PMCID: PMC6789124 DOI: 10.1038/s41598-019-51123-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 09/25/2019] [Indexed: 11/09/2022] Open
Abstract
Currently, surgical staples are composed of non-biodegradable titanium (Ti) that can cause allergic reactions and interfere with imaging. This paper proposes a novel biodegradable magnesium (Mg) alloy staple and discusses analyses conducted to evaluate its safety and feasibility. Specifically, finite element analysis revealed that the proposed staple has a suitable stress distribution while stapling and maintaining closure. Further, an immersion test using artificial intestinal juice produced satisfactory biodegradable behavior, mechanical durability, and biocompatibility in vitro. Hydrogen resulting from rapid corrosion of Mg was observed in small quantities only in the first week of immersion, and most staples maintained their shapes until at least the fourth week. Further, the tensile force was maintained for more than a week and was reduced to approximately one-half by the fourth week. In addition, the Mg concentration of the intestinal artificial juice was at a low cytotoxic level. In porcine intestinal anastomoses, the Mg alloy staples caused neither technical failure nor such complications as anastomotic leakage, hematoma, or adhesion. No necrosis or serious inflammation reaction was histopathologically recognized. Thus, the proposed Mg alloy staple offers a promising alternative to Ti alloy staples.
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Affiliation(s)
- Hizuru Amano
- Department of Pediatric Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, 113-8655, Japan
| | - Kotaro Hanada
- Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, 305-8564, Japan
| | - Akinari Hinoki
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Takahisa Tainaka
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Chiyoe Shirota
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Wataru Sumida
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Kazuki Yokota
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Naruhiko Murase
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Kazuo Oshima
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Kosuke Chiba
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Yujiro Tanaka
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - Hiroo Uchida
- Department of Pediatric Surgery, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan.
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20
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Hou R, Victoria-Hernandez J, Jiang P, Willumeit-Römer R, Luthringer-Feyerabend B, Yi S, Letzig D, Feyerabend F. In vitro evaluation of the ZX11 magnesium alloy as potential bone plate: Degradability and mechanical integrity. Acta Biomater 2019; 97:608-622. [PMID: 31365881 DOI: 10.1016/j.actbio.2019.07.053] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 07/05/2019] [Accepted: 07/26/2019] [Indexed: 02/08/2023]
Abstract
Considering the excellent biocompatibility of magnesium (Mg) alloys and their better mechanical properties compared to polymer materials, a wrought MgZnCa alloy with low contents of Zn (0.7 wt%) and Ca (0.6 wt%) (ZX11) was developed by twin roll casting (TRC) technology as potential biodegradable bone plates. The degradability and cell response of the ZX11 alloy were evaluated in vitro, as well as the mechanical integrity according to tensile tests after immersion. The results revealed a slightly higher degradation rate for the rolled ZX11, in comparison to that of the annealed one. It was mainly caused by the deformation twins and residual strain stored in the rolled alloy, which also seemed to promote localized degradation, thereby leading to a relatively fast deterioration in mechanical properties, especially the fracture strain/elongation. In contrast, after the annealing treatment, the alloy showed relatively lower strength, yet a lower degradation rate and quite stable elongation during the initial weeks of immersion were observed. More importantly, the ZX11 alloy, regardless of the annealing treatment, showed good in vitro cytocomopatibility regarding human primary osteoblasts. The assessment indicates the rolled alloy as a good choice for implantation sites where relatively high mechanical strength is needed during the early implantation, while the annealed alloy is a potential candidate for the sites which demand stable mechanical integrity during service. STATEMENT OF SIGNIFICANCE: The development of magnesium alloys as bone implants demands low degradation rate to gain not only a slow hydrogen evolution, but also a stable mechanical integrity during service. The present study develops a micro-alloyed MgZnCa alloy via twin roll casting (TRC) technology. It exhibited limited cytotoxicity, fairly low degradation rate and comparable strength to the reported Mg-1Zn-5Ca alloy which has been used as bone screws in clinical trials, indicating the great potential application as biodegradable bone implants. Furthermore, it showed good mechanical integrity during immersion to support the defect healing. Our results can aid other researchers to evaluate the mechanical integrity of biodegradable materials and to pay more attention to the effect of degradation behaviour on mechanical integrity of materials.
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Echeverry-Rendon M, Allain JP, Robledo SM, Echeverria F, Harmsen MC. Coatings for biodegradable magnesium-based supports for therapy of vascular disease: A general view. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 102:150-163. [DOI: 10.1016/j.msec.2019.04.032] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 04/02/2019] [Accepted: 04/12/2019] [Indexed: 01/22/2023]
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22
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Wang P, Liu J, Shen S, Li Q, Luo X, Xiong P, Gao S, Yan J, Cheng Y, Xi T. In Vitro and in Vivo Studies on Two-Step Alkali-Fluoride-Treated Mg-Zn-Y-Nd Alloy for Vascular Stent Application: Enhancement in Corrosion Resistance and Biocompatibility. ACS Biomater Sci Eng 2019; 5:3279-3292. [PMID: 33405571 DOI: 10.1021/acsbiomaterials.9b00140] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Bioabsorbable magnesium alloys are becoming prominent materials for cardiovascular stents, as their desirable mechanical properties and favorable biosafety. However, the rapid corrosion of magnesium alloys under physiological conditions hinders their wider application as medical implant materials. Fluoride chemical conversion treatment is an effective and simple technique to improve the corrosion resistance for magnesium alloys. Despite previous literature reporting on fluoride chemical conversion treatment with hydrofluoric acid (HF) in different conditions, some defects are still present on the surface of the coating. In this study, we report on a two-step alkali-fluoride treatment of magnesium alloy by effectively removing the second phase in the substrate surface and form a dense and flawless magnesium fluoride (MgF2) coating to endow the magnesium alloy greater corrosion resistance. The results showed that the serious pitting corrosion caused by galvanic corrosion could be effectively prevented after removing of the second phase of the surface. In vivo tests in a rat subcutaneous implantation model showed that two-step alkali-fluoride-treated MgZnYNd alloy (MgZnYNd-A-F) uniformly corroded with a low corrosion rate. No subcutaneous gas cavities or significant inflammatory cell infiltration were observed for MgZnYNd-A-F in in vivo tests. The two-step alkali-fluoride treatment can significantly improve the corrosion resistance and biocompatibility of magnesium alloy, which has great potential in the application of vascular stents because of its simplicity and effectiveness.
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Affiliation(s)
- Pei Wang
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Jing Liu
- Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Shi Shen
- Department of Orthopedics, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China.,Institute of Orthopedics, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Lab of Musculoskeletal Trauma & War Injuries in PLA, Chinese PLA General Hospital, Beijing 100853, China
| | - Qiyao Li
- Department of Biomedical Engineering, Materials Research Institute, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16801, United States
| | - Xujiang Luo
- Department of Orthopedics, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China.,Institute of Orthopedics, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Lab of Musculoskeletal Trauma & War Injuries in PLA, Chinese PLA General Hospital, Beijing 100853, China
| | - Pan Xiong
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Shuang Gao
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Jianglong Yan
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Yan Cheng
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Tingfei Xi
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.,Shenzhen Institute, Peking University, Shenzhen 518055, China
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Zhang Y, Yan Y, Xu X, Lu Y, Chen L, Li D, Dai Y, Kang Y, Yu K. Investigation on the microstructure, mechanical properties, in vitro degradation behavior and biocompatibility of newly developed Zn-0.8%Li-(Mg, Ag) alloys for guided bone regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:1021-1034. [PMID: 30889634 DOI: 10.1016/j.msec.2019.01.120] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 01/15/2019] [Accepted: 01/25/2019] [Indexed: 12/31/2022]
Abstract
In order to develop a biodegradable guided bone regeneration membrane with the required mechanical properties and high corrosion resistance, Zn-0.8%Li(wt), Zn-0.8%Li-0.2%Mg(wt), and Zn-0.8%Li-0.2%Ag(wt) alloys were cast and hot rolled into 0.1-mm thick sheets. The main secondary phase in Zn-0.8%Li-(Mg, Ag) alloys was the LiZn4 nanoprecipitate. Following the addition of minimal amounts of Mg, the tensile strength of the Zn-0.8%Li-0.2%Mg alloy improved, albeit with a greatly reduced elongation and corrosion resistance. The addition of minimal amounts of Ag refined the microstructure, producing fine equiaxed grains (2.3 μm) in the Zn-0.8%Li-0.2%Ag alloy, and promoted a uniform distribution of LiZn4 nanoprecipitates with increased density and refined size. Therefore, the Zn-0.8%Li-0.2%Ag alloy exhibited optimal tensile strength and the highest corrosion resistance, with its elongation reaching 97.9 ± 8.7%. The corrosion products of Zn-0.8%Li-(Mg, Ag) alloys immersed in Ringer's solution for 35 days mainly consisted of zinc oxide and zinc carbonate. In addition, the cytotoxicity test using L929 cells and the evaluation of bone marrow mesenchymal stem cell proliferation indicated that the Zn-0.8%Li-0.2%Ag alloy had good biocompatibility.
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Affiliation(s)
- Yu Zhang
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; Department of Materials Science and Engineering, Yantai Nanshan University, Yantai 265713, China
| | - Yang Yan
- School of Materials Science and Engineering, Central South University, Changsha 410083, China
| | - Xuemei Xu
- School of Materials Science and Engineering, Central South University, Changsha 410083, China
| | - Yujiao Lu
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; Xiangya Third Hospital, Central South University, Changsha 410013, China
| | - Liangjian Chen
- Xiangya Third Hospital, Central South University, Changsha 410013, China
| | - Ding Li
- The Second XiangYa Hospital, Central South University, Changsha 410011, China
| | - Yilong Dai
- School of Materials Science and Engineering, Central South University, Changsha 410083, China
| | - Yijun Kang
- The Second XiangYa Hospital, Central South University, Changsha 410011, China.
| | - Kun Yu
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; Department of Materials Science and Engineering, Yantai Nanshan University, Yantai 265713, China.
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Chagnon M, Guy LG, Jackson N. Evaluation of Magnesium-based Medical Devices in Preclinical Studies: Challenges and Points to Consider. Toxicol Pathol 2019; 47:390-400. [PMID: 30712470 DOI: 10.1177/0192623318816936] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Absorbable metallic implants have been under investigation for more than a century. Animal and human studies have shown that magnesium (Mg) alloys can be safely used in bioresorbable scaffolds. Several cardiovascular and orthopedic biodegradable metallic devices have recently been approved for use in humans. Bioresorbable Mg implants present many advantages when compared to bioabsorbable polymer or nonabsorbable metallic implants, including similar strength and mechanical properties as existing implant-grade metals without the drawbacks of permanence or need for implant removal. Imaging visibility is also improved compared to polymeric devices. Additionally, with Mg-based cardiovascular stents, the risk of late stent thrombosis and need for long-term anti-platelet therapy may be reduced as the host tissue absorbs the Mg degradation products and the morphology of the vessel returns to a near-normal state. Absorbable Mg implants present challenges in the conduct of preclinical animal studies and interpretation of pathology data due to their particular degradation process associated with gas production and release of by-products. This article will review the different uses of Mg implants, the Mg alloys, the distinctive degradation features of Mg, and the challenges confronting pathologists at tissue collection, fixation, imaging, slide preparation, evaluation, and interpretation of Mg implants.
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25
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Peng F, Wang D, Zhang D, Yan B, Cao H, Qiao Y, Liu X. PEO/Mg–Zn–Al LDH Composite Coating on Mg Alloy as a Zn/Mg Ion-Release Platform with Multifunctions: Enhanced Corrosion Resistance, Osteogenic, and Antibacterial Activities. ACS Biomater Sci Eng 2018; 4:4112-4121. [DOI: 10.1021/acsbiomaterials.8b01184] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Feng Peng
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Donghui Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Dongdong Zhang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bangcheng Yan
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Huiliang Cao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Yuqin Qiao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Xuanyong Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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Development of magnesium-based biodegradable metals with dietary trace element germanium as orthopaedic implant applications. Acta Biomater 2017; 64:421-436. [PMID: 28987782 DOI: 10.1016/j.actbio.2017.10.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 09/13/2017] [Accepted: 10/03/2017] [Indexed: 11/22/2022]
Abstract
From the perspective of element biosafety and dietetics, the ideal alloying elements for magnesium should be those which are essential to or naturally presented in human body. Element germanium is a unique metalloid in the carbon group, chemically similar to its group neighbors, Si and Sn. It is a dietary trace element that naturally presents in human body. Physiological role of Ge is still unanswered, but it might be necessary to ensure normal functioning of the body. In present study, novel magnesium alloys with dietary trace element Ge were developed. Feasibility of those alloys to be used as orthopaedic implant applications was systematically evaluated. Mg-Ge alloys consisted of α-Mg matrix and eutectic phases (α-Mg + Mg2Ge). Mechanical properties of Mg-Ge alloys were comparable to current Mg-Ca, Mg-Zn and Mg-Sr biodegradable metals. As-rolled Mg-3Ge alloy exhibited outstanding corrosion resistance in vitro (0.02 mm/y, electrochemical) with decent corrosion rate in vivo (0.6 mm/y, in rabbit tibia). New bone could directly lay down onto the implant and grew along its surface. After 3 months, bone and implant were closely integrated, indicating well osseointegration being obtained. Generally, this is a pioneering study on the in vitro and in vivo performances of novel Mg-Ge based biodegradable metals, and will benefit the future development of this alloy system. STATEMENT OF SIGNIFICANCE The ideal alloying elements for magnesium-based biodegradable metals should be those which are essential to or naturally presented in human body. Element germanium is a unique metalloid in the carbon group. It is a dietary trace element that naturally presents in human body. In present study, feasibility of Mg-Ge alloys to be utilized as orthopedic applications was systematically investigated, mainly focusing on the microstructure, mechanical property, corrosion behavior and biocompatibility. Our findings showed that Mg-3Ge alloy exhibited superior corrosion resistance to current Mg-Ca, Mg-Zn and Mg-Sr alloys with favorable biocompatibility. This is a pioneering study on the in vitro &in vivo performances of Mg-Ge biodegradable metals, and will benefit the future development of this alloy system.
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Study on the Mg-Li-Zn ternary alloy system with improved mechanical properties, good degradation performance and different responses to cells. Acta Biomater 2017; 62:418-433. [PMID: 28823717 DOI: 10.1016/j.actbio.2017.08.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 07/22/2017] [Accepted: 08/16/2017] [Indexed: 01/04/2023]
Abstract
Novel Mg-(3.5, 6.5wt%)Li-(0.5, 2, 4wt%)Zn ternary alloys were developed as new kinds of biodegradable metallic materials with potential for stent application. Their mechanical properties, degradation behavior, cytocompatibility and hemocompatibility were studied. These potential biomaterials showed higher ultimate tensile strength than previously reported binary Mg-Li alloys and ternary Mg-Li-X (X=Al, Y, Ce, Sc, Mn and Ag) alloys. Among the alloys studied, the Mg-3.5Li-2Zn and Mg-6.5Li-2Zn alloys exhibited comparable corrosion resistance in Hank's solution to pure magnesium and better corrosion resistance in a cell culture medium than pure magnesium. Corrosion products observed on the corroded surface were composed of Mg(OH)2, MgCO3 and Ca-free Mg/P inorganics and Ca/P inorganics. In vitro cytotoxicity assay revealed different behaviors of Human Umbilical Vein Endothelial Cells (HUVECs) and Human Aorta Vascular Smooth Muscle Cells (VSMCs) to material extracts. HUVECs showed increasing nitric oxide (NO) release and tolerable toxicity, whereas VSMCs exhibited limited decreasing viability with time. Platelet adhesion, hemolysis and coagulation tests of these Mg-Li-Zn alloys showed different degrees of activation behavior, in which the hemolysis of the Mg-3.5Li-2Zn alloy was lower than 5%. These results indicated the potential of the Mg-Li-Zn alloys as good candidate materials for cardiovascular stent applications. STATEMENT OF SIGNIFICANCE Mg-Li alloys are promising as absorbable metallic biomaterials, which however have not received significant attention since the low strength, controversial corrosion performance and the doubts in Li toxicity. The Mg-Li-Zn alloy in the present study revealed much improved mechanical properties higher than most reported binary Mg-Li and ternary Mg-Li-X alloys, with superior corrosion resistance in cell culture media. Surprisingly, the addition of Li and Zn showed increased nitric oxide release. The present study indicates good potential of Mg-Li-Zn alloy as absorbable cardiovascular stent material.
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28
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Yang H, Wang C, Liu C, Chen H, Wu Y, Han J, Jia Z, Lin W, Zhang D, Li W, Yuan W, Guo H, Li H, Yang G, Kong D, Zhu D, Takashima K, Ruan L, Nie J, Li X, Zheng Y. Evolution of the degradation mechanism of pure zinc stent in the one-year study of rabbit abdominal aorta model. Biomaterials 2017; 145:92-105. [PMID: 28858721 DOI: 10.1016/j.biomaterials.2017.08.022] [Citation(s) in RCA: 144] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 07/09/2017] [Accepted: 08/14/2017] [Indexed: 01/01/2023]
Abstract
In the present study, pure zinc stents were implanted into the abdominal aorta of rabbits for 12 months. Multiscale analysis including micro-CT, scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and histological stainings was performed to reveal the fundamental degradation mechanism of the pure zinc stent and its biocompatibility. The pure zinc stent was able to maintain mechanical integrity for 6 months and degraded 41.75 ± 29.72% of stent volume after 12 months implantation. No severe inflammation, platelet aggregation, thrombosis formation or obvious intimal hyperplasia was observed at all time points after implantation. The degradation of the zinc stent played a beneficial role in the artery remodeling and healing process. The evolution of the degradation mechanism of pure zinc stents with time was revealed as follows: Before endothelialization, dynamic blood flow dominated the degradation of pure zinc stent, creating a uniform corrosion mode; After endothelialization, the degradation of pure zinc stent depended on the diffusion of water molecules, hydrophilic solutes and ions which led to localized corrosion. Zinc phosphate generated in blood flow transformed into zinc oxide and small amounts of calcium phosphate during the conversion of degradation microenvironment. The favorable physiological degradation behavior makes zinc a promising candidate for future stent applications.
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Affiliation(s)
- Hongtao Yang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Cong Wang
- Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing, 100191, China
| | - Chaoqiang Liu
- College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China
| | - Houwen Chen
- College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China
| | - Yifan Wu
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials, Ministry of Education, Nankai University, Tianjin, 300071, China
| | - Jintao Han
- Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing, 100191, China
| | - Zichang Jia
- Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing, 100191, China
| | - Wenjiao Lin
- R&D Center, Lifetech Scientific (Shenzhen) Co Ltd, Shenzhen, 518057, China
| | - Deyuan Zhang
- R&D Center, Lifetech Scientific (Shenzhen) Co Ltd, Shenzhen, 518057, China
| | - Wenting Li
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Wei Yuan
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Hui Guo
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Huafang Li
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Guangxin Yang
- Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing, 100191, China
| | - Deling Kong
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials, Ministry of Education, Nankai University, Tianjin, 300071, China
| | - Donghui Zhu
- Department of Biomedical Engineering, College of Engineering, University of North Texas, Denton, TX 76207, USA
| | - Kazuki Takashima
- Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan
| | - Liqun Ruan
- Department of Mechanical Systems Engineering, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Kumamoto-shi, 860-8555, Japan
| | - Jianfeng Nie
- College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China; Department of Materials Science and Engineering, Monash University, Victoria, 3800, Australia.
| | - Xuan Li
- Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing, 100191, China.
| | - Yufeng Zheng
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China; International Research Organization for Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-Ku, Kumamoto 860-8555, Japan.
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Peng F, Wang D, Tian Y, Cao H, Qiao Y, Liu X. Sealing the Pores of PEO Coating with Mg-Al Layered Double Hydroxide: Enhanced Corrosion Resistance, Cytocompatibility and Drug Delivery Ability. Sci Rep 2017; 7:8167. [PMID: 28811545 PMCID: PMC5557750 DOI: 10.1038/s41598-017-08238-w] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 07/10/2017] [Indexed: 11/21/2022] Open
Abstract
In recent years, magnesium (Mg) alloys show a promising application in clinic as degradable biomaterials. Nevertheless, the poor corrosion resistance of Mg alloys is the main obstacle to their clinical application. Here we successfully seal the pores of plasma electrolytic oxidation (PEO) coating on AZ31 with Mg-Al layered double hydroxide (LDH) via hydrothermal treatment. PEO/LDH composite coating possess a two layer structure, an inner layer made up of PEO coating (~5 μm) and an outer layer of Mg-Al LDH (~2 μm). Electrochemical and hydrogen evolution tests suggest preferable corrosion resistance of the PEO/LDH coating. Cytotoxicity, cell adhesion, live/dead staining and proliferation data of rat bone marrow stem cells (rBMSCs) demonstrate that PEO/LDH coating remarkably enhance the cytocompatibility of the substrate, indicating a potential application in orthopedic surgeries. In addition, hemolysis rate (HR) test shows that the HR value of PEO/LDH coating is 1.10 ± 0.47%, fulfilling the request of clinical application. More importantly, the structure of Mg-Al LDH on the top of PEO coating shows excellent drug delivery ability.
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Affiliation(s)
- Feng Peng
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Donghui Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yaxin Tian
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Huiliang Cao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yuqin Qiao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Xuanyong Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
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Liu L, Koo Y, Collins B, Xu Z, Sankar J, Yun Y. Biodegradability and platelets adhesion assessment of magnesium-based alloys using a microfluidic system. PLoS One 2017; 12:e0182914. [PMID: 28797069 PMCID: PMC5552284 DOI: 10.1371/journal.pone.0182914] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 07/26/2017] [Indexed: 12/15/2022] Open
Abstract
Magnesium (Mg)-based stents are extensively explored to alleviate atherosclerosis due to their biodegradability and relative hemocompatibility. To ensure the quality, safety and cost-efficacy of bioresorbable scaffolds and full utilization of the material tunability afforded by alloying, it is critical to access degradability and thrombosis potential of Mg-based alloys using improved in vitro models that mimic as closely as possible the in vivo microenvironment. In this study, we investigated biodegradation and initial thrombogenic behavior of Mg-based alloys at the interface between Mg alloys' surface and simulated physiological environment using a microfluidic system. The degradation properties of Mg-based alloys WE43, AZ31, ZWEK-L, and ZWEK-C were evaluated in complete culture medium and their thrombosis potentials in platelet rich plasma, respectively. The results show that 1) physiological shear stress increased the corrosion rate and decreased platelets adhesion rate as compared to static immersion; 2) secondary phases and impurities in material composition induced galvanic corrosion, resulting in higher corrosion resistance and platelet adhesion rate; 3) Mg-based alloys with higher corrosion rate showed higher platelets adhesion rate. We conclude that a microfluidic-based in vitro system allows evaluation of biodegradation behaviors and platelets responses of Mg-based alloys under specific shear stress, and degradability is related to platelets adhesion.
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Affiliation(s)
- Lumei Liu
- National Science Foundation-Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
- FIT BEST Laboratory, Department of Chemical, Biological, and Bioengineering, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
| | - Youngmi Koo
- National Science Foundation-Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
- FIT BEST Laboratory, Department of Chemical, Biological, and Bioengineering, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
| | - Boyce Collins
- National Science Foundation-Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
| | - Zhigang Xu
- National Science Foundation-Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
| | - Jagannathan Sankar
- National Science Foundation-Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
| | - Yeoheung Yun
- National Science Foundation-Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
- FIT BEST Laboratory, Department of Chemical, Biological, and Bioengineering, North Carolina Agricultural and Technical State University, Greensboro, North Carolina, United States of America
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31
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Drelich AJ, Zhao S, Guillory RJ, Drelich JW, Goldman J. Long-term surveillance of zinc implant in murine artery: Surprisingly steady biocorrosion rate. Acta Biomater 2017; 58:539-549. [PMID: 28532901 PMCID: PMC5553077 DOI: 10.1016/j.actbio.2017.05.045] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 05/03/2017] [Accepted: 05/18/2017] [Indexed: 10/19/2022]
Abstract
Metallic zinc implanted into the abdominal aorta of rats out to 6months has been demonstrated to degrade while avoiding responses commonly associated with the restenosis of vascular implants. However, major questions remain regarding whether a zinc implant would ultimately passivate through the production of stable corrosion products or via a cell mediated fibrous encapsulation process that prevents the diffusion of critical reactants and products at the metal surface. Here, we have conducted clinically relevant long term in vivo studies in order to characterize late stage zinc implant biocorrosion behavior and products to address these critical questions. We found that zinc wires implanted in the murine artery exhibit steady corrosion without local toxicity for up to at least 20months post-implantation, despite a steady buildup of passivating corrosion products and intense fibrous encapsulation of the wire. Although fibrous encapsulation was not able to prevent continued implant corrosion, it may be related to the reduced chronic inflammation observed between 10 and 20months post-implantation. X-ray elemental and infrared spectroscopy analyses confirmed zinc oxide, zinc carbonate, and zinc phosphate as the main components of corrosion products surrounding the Zn implant. These products coincide with stable phases concluded from Pourbaix diagrams of a physiological solution and in vitro electrochemical impedance tests. The results support earlier predictions that zinc stents could become successfully bio-integrated into the arterial environment and safely degrade within a time frame of approximately 1-2years. STAEMENT OF SIGNIFICANCE Previous studies have shown zinc to be a promising candidate material for bioresorbable endovascular stenting applications. An outstanding question, however, is whether a zinc implant would ultimately passivate through the production of stable corrosion products or via a cell mediated tissue encapsulation process that prevented the diffusion of critical reactants and products at the metal surface. We found that zinc wires implanted in the murine artery exhibit steady corrosion for up to at least 20months post-implantation. The results confirm earlier predictions that zinc stents could safely degrade within a time frame of approximately 1-2years.
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Affiliation(s)
- Adam J Drelich
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Shan Zhao
- Department of Material Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Roger J Guillory
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Jaroslaw W Drelich
- Department of Material Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA.
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Zhao S, Seitz JM, Eifler R, Maier HJ, Guillory RJ, Earley EJ, Drelich A, Goldman J, Drelich JW. Zn-Li alloy after extrusion and drawing: Structural, mechanical characterization, and biodegradation in abdominal aorta of rat. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:301-312. [PMID: 28482531 PMCID: PMC5459357 DOI: 10.1016/j.msec.2017.02.167] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 01/19/2017] [Accepted: 02/28/2017] [Indexed: 10/20/2022]
Abstract
Zinc shows great promise as a bio-degradable metal. Our early in vivo investigations implanting pure zinc wires into the abdominal aorta of Sprague-Dawley rats revealed that metallic zinc does not promote restenotic responses and may suppress the activities of inflammatory and smooth muscle cells. However, the low tensile strength of zinc remains a major concern. A cast billet of the Zn-Li alloy was produced in a vacuum induction caster under argon atmosphere, followed by a wire drawing process. Two phases of the binary alloy identified by x-ray diffraction include the zinc phase and intermetallic LiZn4 phase. Mechanical testing proved that incorporating 0.1wt% of Li into Zn increased its ultimate tensile strength from 116±13MPa (pure Zn) to 274±61MPa while the ductility was held at 17±7%. Implantation of 10mm Zn-Li wire segments into abdominal aorta of rats revealed an excellent biocompatibility of this material in the arterial environment. The biodegradation rate for Zn-Li was found to be about 0.008mm/yr and 0.045mm/yr at 2 and 12months, respectively.
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Affiliation(s)
- Shan Zhao
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, USA
| | - Jan-M Seitz
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, USA
| | - Rainer Eifler
- Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, Garbsen, Germany
| | - Hans J Maier
- Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, Garbsen, Germany
| | - Roger J Guillory
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, USA
| | - Elisha J Earley
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, USA
| | - Adam Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, USA
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, USA
| | - Jaroslaw W Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, USA.
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Expandable Mg-based Helical Stent Assessment using Static, Dynamic, and Porcine Ex Vivo Models. Sci Rep 2017; 7:1173. [PMID: 28446750 PMCID: PMC5430820 DOI: 10.1038/s41598-017-01214-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 03/27/2017] [Indexed: 12/21/2022] Open
Abstract
A bioresorbable metallic helical stent was explored as a new device opportunity (magnesium scaffold), which can be absorbed by the body without leaving a trace and simultaneously allowing restoration of vasoreactivity with the potential for vessel remodeling. In this study, developed Mg-based helical stent was inserted and expanded in vessels with subsequent degradation in various environments including static, dynamic, and porcine ex vivo models. By assessing stent degradation in three different environments, we observed: (1) stress- and flow-induced degradation; (2) a high degradation rate in the dynamic reactor; (3) production of intermediate products (MgO/Mg(OH)2 and Ca/P) during degradation; and (4) intermediate micro-gas pocket formation in the neighboring tissue ex vivo model. Overall, the expandable Mg-based helical stent employed as a scaffold performed well, with expansion rate (>100%) in porcine ex vivo model.
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Perkins LEL, Kossuth MB, Fox JC, Rapoza RJ. Paving the way to a bioresorbable technology: Development of the absorb BRS program. Catheter Cardiovasc Interv 2017; 88:1-9. [PMID: 27797462 DOI: 10.1002/ccd.26811] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 09/20/2016] [Indexed: 11/09/2022]
Abstract
Bioresorbable scaffolds (BRS) combine attributes of the preceding generations of percutaneous coronary intervention (PCI) devices with new technologies to result in a novel therapy promoted as being the fourth generation of PCI. By providing mechanical support and drug elution to suppress restenosis, BRS initially function similarly to drug eluting stents. Thereafter, through their degradation, BRS undergo a decline in radial strength, allowing a gradual transition of mechanical function from the scaffold back to the artery in order to provide long term effectiveness similar to balloon angioplasty. The principles of operation of BRS, whether of polymeric or metallic composition, follow three phases of functionality reflective of differing physiological requirements over time: revascularization, restoration, and resorption. In this review, these three fundamental performance phases and the metrics for the nonclinical evaluation of BRS, including both bench and preclinical testing, are discussed. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
| | | | - Julia C Fox
- Abbott Vascular, Research and Development, Santa Clara, CA
| | - Richard J Rapoza
- Abbott Vascular, Divisional Vice President of Research and Development, Santa Clara, CA.
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Patil AJ, Jackson O, Fulton LB, Hong D, Desai PA, Kelleher SA, Chou DT, Tan S, Kumta PN, Beniash E. Anticorrosive Self-Assembled Hybrid Alkylsilane Coatings for Resorbable Magnesium Metal Devices. ACS Biomater Sci Eng 2017; 3:518-529. [DOI: 10.1021/acsbiomaterials.6b00585] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Avinash J. Patil
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
- Center
for Craniofacial Regeneration, University of Pittsburgh, 501 Salk
Pavilion, 335 Sutherland Drive, Pittsburgh, Pennsylvania15261, United States
- McGowan
Institute for Regenerative Medicine, University of Pittsburgh, 450 Technology
Drive,Suite 300, Pittsburgh, Pennsylvania 15219, United States
| | - Olivia Jackson
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Laura B. Fulton
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Dandan Hong
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
- Center
for Craniofacial Regeneration, University of Pittsburgh, 501 Salk
Pavilion, 335 Sutherland Drive, Pittsburgh, Pennsylvania15261, United States
- McGowan
Institute for Regenerative Medicine, University of Pittsburgh, 450 Technology
Drive,Suite 300, Pittsburgh, Pennsylvania 15219, United States
| | - Palak A. Desai
- Department
of Biological Sciences, Dietrich School of Arts and Sciences, University of Pittsburgh, 4249 Fifth Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Stephen A. Kelleher
- Department
of Biology, Oberlin College, Science Center K123, 119 Woodland
Street, Oberlin, Ohio 44074, United States
| | - Da-Tren Chou
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Susheng Tan
- Department
of Electrical and Computer Engineering, Swanson School of Engineering, University of Pittsburgh, 1238 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
- Petersen
Institute for NanoScience and Engineering (PINSE), University of Pittsburgh, Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Prashant N. Kumta
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
- Department
of Oral Biology, School of Dental Medicine, University of Pittsburgh, 347 Salk Hall, 3501 Terrace Street, Pittsburgh, Pennsylvania 15261, United States
- Center
for Craniofacial Regeneration, University of Pittsburgh, 501 Salk
Pavilion, 335 Sutherland Drive, Pittsburgh, Pennsylvania15261, United States
- McGowan
Institute for Regenerative Medicine, University of Pittsburgh, 450 Technology
Drive,Suite 300, Pittsburgh, Pennsylvania 15219, United States
- Department
of Chemical and Petroleum Engineering, University of Pittsburgh, 940 Benedum
Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Elia Beniash
- Department
of Bioengineering, Swanson School of Engineering, University of Pittsburgh, 302 Benedum Hall, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
- Department
of Oral Biology, School of Dental Medicine, University of Pittsburgh, 347 Salk Hall, 3501 Terrace Street, Pittsburgh, Pennsylvania 15261, United States
- Center
for Craniofacial Regeneration, University of Pittsburgh, 501 Salk
Pavilion, 335 Sutherland Drive, Pittsburgh, Pennsylvania15261, United States
- McGowan
Institute for Regenerative Medicine, University of Pittsburgh, 450 Technology
Drive,Suite 300, Pittsburgh, Pennsylvania 15219, United States
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Zhang J, Hiromoto S, Yamazaki T, Huang H, Jia G, Li H, Yuan G. Macrophage phagocytosis of biomedical Mg alloy degradation products prepared by electrochemical method. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 75:1178-1183. [PMID: 28415404 DOI: 10.1016/j.msec.2017.02.126] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 12/23/2016] [Accepted: 02/24/2017] [Indexed: 11/28/2022]
Abstract
Biomedical Mg alloy is promising for its widespread use clinically. In vitro and in vivo studies showed that the degradation products of biomedical Mg alloy were composed of O, P, Ca, Mg and other alloying elements. However, little is known about the metabolism of the degradation products. In this study, the in vitro macrophage phagocytosis of the degradation products of a biomedical Mg-Nd-Zn-Zr alloy was directly observed. This result affirms the necessity to investigate the long-term fate of Mg alloy degradation products in physiological environments. Besides, an electrochemical method was proposed to prepare enough amount of degradation products in vitro efficiently.
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Affiliation(s)
- Jian Zhang
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China; Biomaterials Unit, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba 305-0047, Japan
| | - Sachiko Hiromoto
- Biomaterials Unit, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba 305-0047, Japan.
| | - Tomohiko Yamazaki
- Biomaterials Unit, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba 305-0047, Japan
| | - Hua Huang
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Gaozhi Jia
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Haiyan Li
- Med-X Research Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Guangyin Yuan
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China.
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Wang J, Liu L, Wu Y, Maitz MF, Wang Z, Koo Y, Zhao A, Sankar J, Kong D, Huang N, Yun Y. Ex vivo blood vessel bioreactor for analysis of the biodegradation of magnesium stent models with and without vessel wall integration. Acta Biomater 2017; 50:546-555. [PMID: 28013101 DOI: 10.1016/j.actbio.2016.12.039] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 12/12/2016] [Accepted: 12/20/2016] [Indexed: 01/02/2023]
Abstract
Current in vitro models fail in predicting the degradation rate and mode of magnesium (Mg) stents in vivo. To overcome this, the microenvironment of the stent is simulated here in an ex vivo bioreactor with porcine aorta and circulating medium, and compared with standard static in vitro immersion and with in vivo rat aorta models. In ex vivo and in vivo conditions, pure Mg wires were exposed to the aortic lumen and inserted into the aortic wall to mimic early- and long-term implantation, respectively. Results showed that: 1) Degradation rates of Mg were similar for all the fluid diffusion conditions (in vitro static, aortic wall ex vivo and in vivo); however, Mg degradation under flow condition (i.e. in the lumen) in vivo was slower than ex vivo; 2) The corrosion mode in the samples can be mainly described as localized (in vitro), mixed localized and uniform (ex vivo), and uniform (in vivo); 3) Abundant degradation products (MgO/Mg(OH)2 and Ca/P) with gas bubbles accumulated around the localized degradation regions ex vivo, but a uniform and thin degradation product layer was found in vivo. It is concluded that the ex vivo vascular bioreactor provides an improved test setting for magnesium degradation between static immersion and animal experiments and highlights its promising role in bridging degradation behavior and biological response for vascular stent research. STATEMENT OF SIGNIFICANCE Magnesium and its alloys are candidates for a new generation of biodegradable stent materials. However, the in vitro degradation of magnesium stents does not match the clinical degradation rates, corrupting the validity of conventional degradation tests. Here we report an ex vivo vascular bioreactor, which allows simulation of the microenvironment with and without blood vessel integration to study the biodegradation of magnesium implants in comparison with standard in vitro test conditions and with in vivo implantations. The bioreactor did simulate the corrosion of an intramural implant very well, but showed too high degradation for non-covered implants. It is concluded that this system is in between static incubation and animal experiments concerning the predictivity of the degradation.
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Affiliation(s)
- Juan Wang
- NSF Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Lumei Liu
- NSF Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; FIT BEST Laboratory, Department of Chemical, Biological, and Bio Engineering, North Carolina A&T State University, Greensboro, NC 27411, USA
| | - Yifan Wu
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials, Ministry of Education, Nankai University, Tianjin 300071, PR China
| | - Manfred F Maitz
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Dresden 01069, Germany
| | - Zhihong Wang
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials, Ministry of Education, Nankai University, Tianjin 300071, PR China
| | - Youngmi Koo
- NSF Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; FIT BEST Laboratory, Department of Chemical, Biological, and Bio Engineering, North Carolina A&T State University, Greensboro, NC 27411, USA
| | - Ansha Zhao
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Jagannathan Sankar
- NSF Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; FIT BEST Laboratory, Department of Chemical, Biological, and Bio Engineering, North Carolina A&T State University, Greensboro, NC 27411, USA
| | - Deling Kong
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials, Ministry of Education, Nankai University, Tianjin 300071, PR China.
| | - Nan Huang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China.
| | - Yeoheung Yun
- NSF Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina A&T State University, Greensboro, NC 27411, USA; FIT BEST Laboratory, Department of Chemical, Biological, and Bio Engineering, North Carolina A&T State University, Greensboro, NC 27411, USA.
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Bowen PK, Seitz JM, Guillory RJ, Braykovich JP, Zhao S, Goldman J, Drelich JW. Evaluation of wrought Zn-Al alloys (1, 3, and 5 wt % Al) through mechanical and in vivo testing for stent applications. J Biomed Mater Res B Appl Biomater 2017; 106:245-258. [PMID: 28130871 DOI: 10.1002/jbm.b.33850] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 12/26/2016] [Accepted: 01/01/2017] [Indexed: 11/09/2022]
Abstract
Special high grade zinc and wrought zinc-aluminum (Zn-Al) alloys containing up to 5.5 wt % Al were processed, characterized, and implanted in rats in search of a new family of alloys with possible applications as bioabsorbable endovascular stents. These materials retained roll-induced texture with an anisotropic distribution of the second-phase Al precipitates following hot-rolling, and changes in lattice parameters were observed with respect to Al content. Mechanical properties for the alloys fell roughly in line with strength (190-240 MPa yield strength; 220-300 MPa ultimate tensile strength) and elongation (15-30%) benchmarks, and favorable elastic ranges (0.19-0.27%) were observed. Intergranular corrosion was observed during residence of Zn-Al alloys in the murine aorta, suggesting a different corrosion mechanism than that of pure zinc. This mode of failure needs to be avoided for stent applications because the intergranular corrosion caused cracking and fragmentation of the implants, although the composition of corrosion products was roughly identical between non- and Al-containing materials. In spite of differences in corrosion mechanisms, the cross-sectional reduction of metals in murine aorta was nearly identical at 30-40% and 40-50% after 4.5 and 6 months, respectively, for pure Zn and Zn-Al alloys. Histopathological analysis and evaluation of arterial tissue compatibility around Zn-Al alloys failed to identify areas of necrosis, though both chronic and acute inflammatory indications were present. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 245-258, 2018.
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Affiliation(s)
- Patrick K Bowen
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, 49931
| | - Jan-Marten Seitz
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, 49931
| | - Roger J Guillory
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, 49931
| | - Jacob P Braykovich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, 49931
| | - Shan Zhao
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, 49931
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, 49931
| | - Jaroslaw W Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, 49931
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Cipriano AF, Sallee A, Tayoba M, Cortez Alcaraz MC, Lin A, Guan RG, Zhao ZY, Liu H. Cytocompatibility and early inflammatory response of human endothelial cells in direct culture with Mg-Zn-Sr alloys. Acta Biomater 2017; 48:499-520. [PMID: 27746360 PMCID: PMC5873597 DOI: 10.1016/j.actbio.2016.10.020] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 10/04/2016] [Accepted: 10/12/2016] [Indexed: 12/18/2022]
Abstract
Crystalline Mg-Zinc (Zn)-Strontium (Sr) ternary alloys consist of elements naturally present in the human body and provide attractive mechanical and biodegradable properties for a variety of biomedical applications. The first objective of this study was to investigate the degradation and cytocompatibility of four Mg-4Zn-xSr alloys (x=0.15, 0.5, 1.0, 1.5wt%; designated as ZSr41A, B, C, and D respectively) in the direct culture with human umbilical vein endothelial cells (HUVEC) in vitro. The second objective was to investigate, for the first time, the early-stage inflammatory response in cultured HUVECs as indicated by the induction of vascular cellular adhesion molecule-1 (VCAM-1). The results showed that the 24-h in vitro degradation of the ZSr41 alloys containing a β-phase with a Zn/Sr at% ratio ∼1.5 was significantly faster than the ZSr41 alloys with Zn/Sr at% ∼1. Additionally, the adhesion density of HUVECs in the direct culture but not in direct contact with the ZSr41 alloys for up to 24h was not adversely affected by the degradation of the alloys. Importantly, neither culture media supplemented with up to 27.6mM Mg2+ ions nor media intentionally adjusted up to alkaline pH 9 induced any detectable adverse effects on HUVEC responses. In contrast, the significantly higher, yet non-cytotoxic, Zn2+ ion concentration from the degradation of ZSr41D alloy was likely the cause for the initially higher VCAM-1 expression on cultured HUVECs. Lastly, analysis of the HUVEC-ZSr41 interface showed near-complete absence of cell adhesion directly on the sample surface, most likely caused by either a high local alkalinity, change in surface topography, and/or surface composition. The direct culture method used in this study was proposed as a valuable tool for studying the design aspects of Zn-containing Mg-based biomaterials in vitro, in order to engineer solutions to address current shortcomings of Mg alloys for vascular device applications. STATEMENT OF SIGNIFICANCE Magnesium (Mg) alloys specifically designed for biodegradable implant applications have been the focus of biomedical research since the early 2000s. Physicochemical properties of Mg alloys make these metallic biomaterials excellent candidates for temporary biodegradable implants in orthopedic and cardiovascular applications. As Mg alloys continue to be investigated for biomedical applications, it is necessary to understand whether Mg-based materials or the alloying elements have the intrinsic ability to direct an immune response to improve implant integration while avoiding cell-biomaterial interactions leading to chronic inflammation and/or foreign body reactions. The present study utilized the direct culture method to investigate for the first time the in vitro transient inflammatory activation of endothelial cells induced by the degradation products of Zn-containing Mg alloys.
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Affiliation(s)
- Aaron F Cipriano
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; Materials Science & Engineering Program, University of California, Riverside, CA 92521, USA
| | - Amy Sallee
- Department of Bioengineering, University of California, Riverside, CA 92521, USA
| | - Myla Tayoba
- Department of Bioengineering, University of California, Riverside, CA 92521, USA
| | | | - Alan Lin
- Department of Bioengineering, University of California, Riverside, CA 92521, USA
| | - Ren-Guo Guan
- School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
| | - Zhan-Yong Zhao
- School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
| | - Huinan Liu
- Department of Bioengineering, University of California, Riverside, CA 92521, USA; Materials Science & Engineering Program, University of California, Riverside, CA 92521, USA; Stem Cell Center, University of California, Riverside, CA 92521, USA; Cell, Molecular and Developmental Biology Program, University of California, Riverside, CA 92521, USA.
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40
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Wu H, Zhao C, Ni J, Zhang S, Liu J, Yan J, Chen Y, Zhang X. Research of a novel biodegradable surgical staple made of high purity magnesium. Bioact Mater 2016; 1:122-126. [PMID: 29744400 PMCID: PMC5883960 DOI: 10.1016/j.bioactmat.2016.09.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 09/08/2016] [Accepted: 09/09/2016] [Indexed: 12/13/2022] Open
Abstract
Surgical staples made of pure titanium and titanium alloys are widely used in gastrointestinal anastomosis. However the Ti staple cannot be absorbed in human body and produce artifacts on computed tomography (CT) and other imaging examination, and cause the risk of incorrect diagnosis. The bioabsorbable staple made from polymers that can degrade in human body environment, is an alternative. In the present study, biodegradable high purity magnesium staples were developed for gastric anastomosis. U-shape staples with two different interior angles, namely original 90° and modified 100°, were designed. Finite element analysis (FEA) showed that the residual stress concentrated on the arc part when the original staple was closed to B-shape, while it concentrated on the feet for the modified staple after closure. The in vitro tests indicated that the arc part of the original staple ruptured firstly after 7 days immersion, whereas the modified one kept intact, demonstrating residual stress greatly affected the corrosion behavior of the HP-Mg staples. The in vivo implantation showed good biocompatibility of the modified Mg staples, without inflammatory reaction 9 weeks post-operation. The Mg staples kept good closure to the Anastomosis, no leaking and bleeding were found, and the staples exhibited no fracture or severe corrosion cracks during the degradation. A modified structure with about 100° interior angle of U-shape was selected by using FEA. In vitro immersion experiment showed homogeneous corrosion behavior of the modified HP-Mg surgical staple. In vivo implantation suggested that the modified HP-Mg surgical staple had enough closure strength and good biocompatibility.
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Affiliation(s)
- Hongliu Wu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Changli Zhao
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jiahua Ni
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Shaoxiang Zhang
- Suzhou Origin Medical Technology Co. Ltd., Jiangsu 215513, China
| | - Jingyi Liu
- Suzhou Origin Medical Technology Co. Ltd., Jiangsu 215513, China
| | - Jun Yan
- Department of General Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, China
| | - Yigang Chen
- Department of General Surgery, Wuxi No. 2 People's Hospital, Nanjing Medical University, Wuxi, 214002, China
| | - Xiaonong Zhang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.,Suzhou Origin Medical Technology Co. Ltd., Jiangsu 215513, China
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41
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Zhang J, Hiromoto S, Yamazaki T, Niu J, Huang H, Jia G, Li H, Ding W, Yuan G. Effect of macrophages onin vitrocorrosion behavior of magnesium alloy. J Biomed Mater Res A 2016; 104:2476-87. [DOI: 10.1002/jbm.a.35788] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 05/19/2016] [Accepted: 05/20/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Jian Zhang
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
- Biomaterials Unit; International Center for Materials Nanoarchitectonics (WPI-MANA); National Institute for Materials Science; Tsukuba Japan
| | - Sachiko Hiromoto
- Biomaterials Unit; International Center for Materials Nanoarchitectonics (WPI-MANA); National Institute for Materials Science; Tsukuba Japan
| | - Tomohiko Yamazaki
- Biomaterials Unit; International Center for Materials Nanoarchitectonics (WPI-MANA); National Institute for Materials Science; Tsukuba Japan
| | - Jialin Niu
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
| | - Hua Huang
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
| | - Gaozhi Jia
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
| | - Haiyan Li
- Med-X Research Institute; School of Biomedical Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
| | - Wenjiang Ding
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
| | - Guangyin Yuan
- National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai People's Republic of China
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Rahim MI, Tavares A, Evertz F, Kieke M, Seitz JM, Eifler R, Weizbauer A, Willbold E, Jürgen Maier H, Glasmacher B, Behrens P, Hauser H, Mueller PP. Phosphate conversion coating reduces the degradation rate and suppresses side effects of metallic magnesium implants in an animal model. J Biomed Mater Res B Appl Biomater 2016; 105:1622-1635. [DOI: 10.1002/jbm.b.33704] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 02/05/2016] [Accepted: 04/21/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Muhammad Imran Rahim
- Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
| | - Ana Tavares
- Institute for Multiphase Processes, Leibniz University of Hannover; Appelstrasse 11 30167 Hannover Germany
| | - Florian Evertz
- Institute for Multiphase Processes, Leibniz University of Hannover; Appelstrasse 11 30167 Hannover Germany
| | - Marc Kieke
- Institute for Inorganic Chemistry, Leibniz University of Hannover; Callinstrasse 9 30167 Hannover Germany
| | - Jan-Marten Seitz
- Institute of Materials Science, Leibniz University of Hannover; An der Universität 2 30823 Garbsen Germany
- Department of Materials Science and Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton Michigan 49931
| | - Rainer Eifler
- Institute of Materials Science, Leibniz University of Hannover; An der Universität 2 30823 Garbsen Germany
| | - Andreas Weizbauer
- CrossBIT, Center for Biocompatibility and Implant-Immunology, Department of Orthopedic Surgery, Hannover Medical School; Feodor-Lynen-Strasse 31 30625 Hannover Germany
- Laboratory for Biomechanics and Biomaterials, Department of Orthopedic Surgery; Hannover Medical School; Anna-von-Borries-Strasse 1-7 30625 Hannover Germany
| | - Elmar Willbold
- CrossBIT, Center for Biocompatibility and Implant-Immunology, Department of Orthopedic Surgery, Hannover Medical School; Feodor-Lynen-Strasse 31 30625 Hannover Germany
- Laboratory for Biomechanics and Biomaterials, Department of Orthopedic Surgery; Hannover Medical School; Anna-von-Borries-Strasse 1-7 30625 Hannover Germany
| | - Hans Jürgen Maier
- Institute of Materials Science, Leibniz University of Hannover; An der Universität 2 30823 Garbsen Germany
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz University of Hannover; Appelstrasse 11 30167 Hannover Germany
| | - Peter Behrens
- Institute for Inorganic Chemistry, Leibniz University of Hannover; Callinstrasse 9 30167 Hannover Germany
| | - Hansjörg Hauser
- Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
| | - Peter P. Mueller
- Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
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43
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Bowen PK, Shearier ER, Zhao S, Guillory RJ, Zhao F, Goldman J, Drelich JW. Biodegradable Metals for Cardiovascular Stents: from Clinical Concerns to Recent Zn-Alloys. Adv Healthc Mater 2016; 5:1121-40. [PMID: 27094868 PMCID: PMC4904226 DOI: 10.1002/adhm.201501019] [Citation(s) in RCA: 180] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 03/01/2016] [Indexed: 12/31/2022]
Abstract
Metallic stents are used to promote revascularization and maintain patency of plaqued or damaged arteries following balloon angioplasty. To mitigate the long-term side effects associated with corrosion-resistant stents (i.e., chronic inflammation and late stage thrombosis), a new generation of so-called "bioabsorbable" stents is currently being developed. The bioabsorbable coronary stents will corrode and be absorbed by the artery after completing their task as vascular scaffolding. Research spanning the last two decades has focused on biodegradable polymeric, iron-based, and magnesium-based stent materials. The inherent mechanical and surface properties of metals make them more attractive stent material candidates than their polymeric counterparts. A third class of metallic bioabsorbable materials that are based on zinc has been introduced in the last few years. This new zinc-based class of materials demonstrates the potential for an absorbable metallic stent with the mechanical and biodegradation characteristics required for optimal stent performance. This review compares bioabsorbable materials and summarizes progress towards bioabsorbable stents. It emphasizes the current understanding of physiological and biological benefits of zinc and its biocompatibility. Finally, the review provides an outlook on challenges in designing zinc-based stents of optimal mechanical properties and biodegradation rate.
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Affiliation(s)
- Patrick K Bowen
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, 49931
| | - Emily R Shearier
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, 49931
| | - Shan Zhao
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, 49931
| | - Roger J Guillory
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, 49931
| | - Feng Zhao
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, 49931
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, 49931
| | - Jaroslaw W Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, 49931
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44
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Törne K, Örnberg A, Weissenrieder J. The influence of buffer system and biological fluids on the degradation of magnesium. J Biomed Mater Res B Appl Biomater 2016; 105:1490-1502. [PMID: 27098550 DOI: 10.1002/jbm.b.33685] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 03/22/2016] [Accepted: 03/29/2016] [Indexed: 01/25/2023]
Affiliation(s)
- Karin Törne
- Materials and Nano Physics; KTH Royal Institute of Technology; Electrum 229 16440 Kista Sweden
- St. Jude Medical; 177 East County Road B St. Paul MN 55117 USA
| | - Andreas Örnberg
- St. Jude Medical; 177 East County Road B St. Paul MN 55117 USA
| | - Jonas Weissenrieder
- Materials and Nano Physics; KTH Royal Institute of Technology; Electrum 229 16440 Kista Sweden
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45
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Shearier ER, Bowen PK, He W, Drelich A, Drelich J, Goldman J, Zhao F. In Vitro Cytotoxicity, Adhesion, and Proliferation of Human Vascular Cells Exposed to Zinc. ACS Biomater Sci Eng 2016; 2:634-642. [PMID: 27840847 DOI: 10.1021/acsbiomaterials.6b00035] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Zinc (Zn) and its alloys have recently been introduced as a new class of biodegradable metals with potential application in biodegradable vascular stents. Although an in vivo feasibility study pointed to outstanding biocompatibility of Zn-based implants in vascular environments, a thorough understanding of how Zn and Zn2+ affect surrounding cells is lacking. In this comparative study, three vascular cell types-human endothelial cells (HAEC), human aortic smooth muscle cells (AoSMC), and human dermal fibroblasts (hDF)-were studied to advance the understanding of Zn/Zn2+-cell interactions. Aqueous cytotoxicity using a Zn2+ insult assay resulted in LD50 values of 50 µM for hDF, 70 µM for AoSMC, and 265 µM for HAEC. Direct cell contact with the metallic Zn surface resulted initially in cell attachment, but was quickly followed by cell death. After modification of the Zn surface using a layer of gelatin-intended to mimic a protein layer seen in vivo-the cells were able to attach and proliferate on the Zn surface. Further experiments demonstrated a Zn dose-dependent effect on cell spreading and migration, suggesting that both adhesion and cell mobility may be hindered by free Zn2+.
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Affiliation(s)
- Emily R Shearier
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Patrick K Bowen
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Weilue He
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Adam Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Jaroslaw Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Feng Zhao
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
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46
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Yoshizawa S, Chaya A, Verdelis K, Bilodeau EA, Sfeir C. An in vivo model to assess magnesium alloys and their biological effect on human bone marrow stromal cells. Acta Biomater 2015; 28:234-239. [PMID: 26318803 DOI: 10.1016/j.actbio.2015.08.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 08/14/2015] [Accepted: 08/25/2015] [Indexed: 11/28/2022]
Abstract
Magnesium (Mg) alloys have many unique qualities which make them ideal candidates for bone fixation devices, including biocompatibility and degradation in vivo. Despite a rise in Mg alloy production and research, there remains no standardized system to assess their degradation or biological effect on human stem cells in vivo. In this study, we developed a novel in vivo model to assess Mg alloys for craniofacial and orthopedic applications. Our model consists of a collagen sponge seeded with human bone marrow stromal cells (hBMSCs) around a central Mg alloy rod. These scaffolds were implanted subcutaneously in mice and analyzed after eight weeks. Alloy degradation and biological effect were determined by microcomputed tomography (microCT), histological staining, and immunohistochemistry (IHC). MicroCT showed greater volume loss for pure Mg compared to AZ31 after eight weeks in vivo. Histological analysis showed that hBMSCs were retained around the Mg implants after 8 weeks. Furthermore, immunohistochemistry showed the expression of dentin matrix protein 1 and osteopontin around both pure Mg and AZ31 with implanted hBMSCs. In addition, histological sections showed a thin mineral layer around all degrading alloys at the alloy-tissue interface. In conclusion, our data show that degrading pure Mg and AZ31 implants are cytocompatible and do not inhibit the osteogenic property of hBMSCs in vivo. These results demonstrate that this model can be used to efficiently assess the biological effect of corroding Mg alloys in vivo. Importantly, this model may be modified to accommodate additional cell types and clinical applications. STATEMENT OF SIGNIFICANCE Magnesium (Mg) alloys have been investigated as ideal candidates for bone fixation devices due to high biocompatibility and degradation in vivo, and there is a growing need of establishing an efficient in vivo material screening system. In this study, we assessed degradation rate and biological effect of Mg alloys by transplanting Mg alloy rod with human bone marrow stromal cells seeded on collagen sponge subcutaneously in mice. After 8 weeks, samples were analyzed by microcomputed tomography and histological staining. Our data show that degrading Mg alloys are cytocompatible and do not inhibit the osteogenic property of hBMSCs in vivo. These results demonstrate that this model can be used to efficiently assess the biological effect of corroding Mg alloys in vivo.
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Affiliation(s)
- Sayuri Yoshizawa
- Department of Periodontics and Preventive Dentistry, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Amy Chaya
- Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kostas Verdelis
- Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Elizabeth A Bilodeau
- Department of Diagnostic Sciences, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Charles Sfeir
- Department of Periodontics and Preventive Dentistry, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
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47
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Seitz JM, Durisin M, Goldman J, Drelich JW. Recent advances in biodegradable metals for medical sutures: a critical review. Adv Healthc Mater 2015; 4:1915-36. [PMID: 26172399 DOI: 10.1002/adhm.201500189] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 06/06/2015] [Indexed: 12/13/2022]
Abstract
Sutures that biodegrade and dissolve over a period of several weeks are in great demand to stitch wounds and surgical incisions. These new materials are receiving increased acceptance across surgical procedures whenever permanent sutures and long-term care are not needed. Unfortunately, both inflammatory responses and adverse local tissue reactions in the close-to-stitching environment are often reported for biodegradable polymeric sutures currently used by the medical community. While bioabsorbable metals are predominantly investigated and tested for vascular stent or osteosynthesis applications, they also appear to possess adequate bio-compatibility, mechanical properties, and corrosion stability to replace biodegradable polymeric sutures. In this Review, biodegradable alloys made of iron, magnesium, and zinc are critically evaluated as potential materials for the manufacturing of soft and hard tissue sutures. In the case of soft tissue closing and stitching, these metals have to compete against currently available degradable polymers. In the case of hard tissue closing and stitching, biodegradable sternal wires could replace the permanent sutures made of stainless steel or titanium alloys. This Review discusses the specific materials and degradation properties required by all suture materials, summarizes current suture testing protocols and provides a well-grounded direction for the potential future development of biodegradable metal based sutures.
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Affiliation(s)
- Jan-Marten Seitz
- Department of Biomedical Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton MI 49931 USA
- Department of Materials Science and Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton MI 49931 USA
| | - Martin Durisin
- Department of Otorhinolaryngology; Hannover Medical School; Carl-Neuberg-Str. 1 30625 Hannover Germany
| | - Jeremy Goldman
- Department of Biomedical Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton MI 49931 USA
| | - Jaroslaw W. Drelich
- Department of Materials Science and Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton MI 49931 USA
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48
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Bowen PK, McNamara CT, Mills OP, Drelich J, Goldman J. FIB-TEM Study of Magnesium Corrosion Products after 14 Days in the Murine Artery. ACS Biomater Sci Eng 2015; 1:919-926. [DOI: 10.1021/acsbiomaterials.5b00044] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patrick K. Bowen
- Department of Materials Science
and Engineering, ‡Applied Chemical and Morphological
Analysis Laboratory, and §Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49331, United States
| | - Cameron T. McNamara
- Department of Materials Science
and Engineering, ‡Applied Chemical and Morphological
Analysis Laboratory, and §Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49331, United States
| | - Owen P. Mills
- Department of Materials Science
and Engineering, ‡Applied Chemical and Morphological
Analysis Laboratory, and §Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49331, United States
| | - Jaroslaw Drelich
- Department of Materials Science
and Engineering, ‡Applied Chemical and Morphological
Analysis Laboratory, and §Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49331, United States
| | - Jeremy Goldman
- Department of Materials Science
and Engineering, ‡Applied Chemical and Morphological
Analysis Laboratory, and §Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49331, United States
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49
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Bowen PK, Guillory RJ, Shearier ER, Seitz JM, Drelich J, Bocks M, Zhao F, Goldman J. Metallic zinc exhibits optimal biocompatibility for bioabsorbable endovascular stents. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 56:467-72. [PMID: 26249616 DOI: 10.1016/j.msec.2015.07.022] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 07/07/2015] [Accepted: 07/10/2015] [Indexed: 11/27/2022]
Abstract
Although corrosion resistant bare metal stents are considered generally effective, their permanent presence in a diseased artery is an increasingly recognized limitation due to the potential for long-term complications. We previously reported that metallic zinc exhibited an ideal biocorrosion rate within murine aortas, thus raising the possibility of zinc as a candidate base material for endovascular stenting applications. This study was undertaken to further assess the arterial biocompatibility of metallic zinc. Metallic zinc wires were punctured and advanced into the rat abdominal aorta lumen for up to 6.5months. This study demonstrated that metallic zinc did not provoke responses that often contribute to restenosis. Low cell densities and neointimal tissue thickness, along with tissue regeneration within the corroding implant, point to optimal biocompatibility of corroding zinc. Furthermore, the lack of progression in neointimal tissue thickness over 6.5months or the presence of smooth muscle cells near the zinc implant suggest that the products of zinc corrosion may suppress the activities of inflammatory and smooth muscle cells.
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Affiliation(s)
- Patrick K Bowen
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA.
| | - Roger J Guillory
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Emily R Shearier
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Jan-Marten Seitz
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA; Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Jaroslaw Drelich
- Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Martin Bocks
- University of Michigan Congenital Heart Center, Division of Pediatric Cardiology, Ann Arbor, MI 48109, USA
| | - Feng Zhao
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA.
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50
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Chaya A, Yoshizawa S, Verdelis K, Myers N, Costello BJ, Chou DT, Pal S, Maiti S, Kumta PN, Sfeir C. In vivo study of magnesium plate and screw degradation and bone fracture healing. Acta Biomater 2015; 18:262-9. [PMID: 25712384 DOI: 10.1016/j.actbio.2015.02.010] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 02/10/2015] [Accepted: 02/13/2015] [Indexed: 11/18/2022]
Abstract
Each year, millions of Americans suffer bone fractures, often requiring internal fixation. Current devices, like plates and screws, are made with permanent metals or resorbable polymers. Permanent metals provide strength and biocompatibility, but cause long-term complications and may require removal. Resorbable polymers reduce long-term complications, but are unsuitable for many load-bearing applications. To mitigate complications, degradable magnesium (Mg) alloys are being developed for craniofacial and orthopedic applications. Their combination of strength and degradation make them ideal for bone fixation. Previously, we conducted a pilot study comparing Mg and titanium devices with a rabbit ulna fracture model. We observed Mg device degradation, with uninhibited healing. Interestingly, we observed bone formation around degrading Mg, but not titanium, devices. These results highlighted the potential for these fixation devices. To better assess their efficacy, we conducted a more thorough study assessing 99.9% Mg devices in a similar rabbit ulna fracture model. Device degradation, fracture healing, and bone formation were evaluated using microcomputed tomography, histology and biomechanical tests. We observed device degradation throughout, and calculated a corrosion rate of 0.40±0.04mm/year after 8 weeks. In addition, we observed fracture healing by 8 weeks, and maturation after 16 weeks. In accordance with our pilot study, we observed bone formation surrounding Mg devices, with complete overgrowth by 16 weeks. Bend tests revealed no difference in flexural load of healed ulnae with Mg devices compared to intact ulnae. These data suggest that Mg devices provide stabilization to facilitate healing, while degrading and stimulating new bone formation.
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Affiliation(s)
- Amy Chaya
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sayuri Yoshizawa
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kostas Verdelis
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Nicole Myers
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bernard J Costello
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral and Maxillofacial Surgery, University of Pittsburgh, Pittsburgh, PA, USA
| | - Da-Tren Chou
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Siladitya Pal
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Spandan Maiti
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Prashant N Kumta
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Charles Sfeir
- The Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA, USA; The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
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