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Hassan M, Sulaiman M, Yuvaraju PD, Galiwango E, Rehman IU, Al-Marzouqi AH, Khaleel A, Mohsin S. Biomimetic PLGA/Strontium-Zinc Nano Hydroxyapatite Composite Scaffolds for Bone Regeneration. J Funct Biomater 2022; 13:jfb13010013. [PMID: 35225976 PMCID: PMC8883951 DOI: 10.3390/jfb13010013] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/22/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Synthetic bone graft substitutes have attracted increasing attention in tissue engineering. This study aimed to fabricate a novel, bioactive, porous scaffold that can be used as a bone substitute. Strontium and zinc doped nano-hydroxyapatite (Sr/Zn n-HAp) were synthesized by a water-based sol-gel technique. Sr/Zn n-HAp and poly (lactide-co-glycolide) (PLGA) were used to fabricate composite scaffolds by supercritical carbon dioxide technique. FTIR, XRD, TEM, SEM, and TGA were used to characterize Sr/Zn n-HAp and the composite scaffolds. The synthesized scaffolds were adequately porous with an average pore size range between 189 to 406 µm. The scaffolds demonstrated bioactive behavior by forming crystals when immersed in the simulated body fluid. The scaffolds after immersing in Tris/HCl buffer increased the pH value of the medium, establishing their favorable biodegradable behavior. ICP-MS study for the scaffolds detected the presence of Sr, Ca, and Zn ions in the SBF within the first week, which would augment osseointegration if implanted in the body. nHAp and their composites (PLGA-nHAp) showed ultimate compressive strength ranging between 0.4–19.8 MPa. A 2.5% Sr/Zn substituted nHAp-PLGA composite showed a compressive behavior resembling that of cancellous bone indicating it as a good candidate for cancellous bone substitute.
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Affiliation(s)
- Mozan Hassan
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates; (M.H.); (M.S.)
| | - Mohsin Sulaiman
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates; (M.H.); (M.S.)
| | - Priya Dharshini Yuvaraju
- Department of Pharmacology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates;
| | - Emmanuel Galiwango
- Department of Chemical and Petroleum Engineering, College of Engineering, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates; (E.G.); (A.H.A.-M.)
- Energy Systems and Nuclear Science Faculty, Ontario Tech University, Oshawa, ON L1G 8C4, Canada
| | - Ihtesham ur Rehman
- Engineering Department, Faculty of Science and Technology, Lancaster University, Gillow Avenue, Lancaster LA1 4YW, UK;
| | - Ali H. Al-Marzouqi
- Department of Chemical and Petroleum Engineering, College of Engineering, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates; (E.G.); (A.H.A.-M.)
| | - Abbas Khaleel
- Department of Chemistry, College of Science, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates;
| | - Sahar Mohsin
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates; (M.H.); (M.S.)
- Correspondence: ; Tel.: +971-3-713-7516
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Wójcik NA, Sinitsyna P, Ali S, Hupa L, Jonson B. In Vitro Dissolution of Na-Ca-P-Oxynitrides. MATERIALS 2021; 14:ma14237425. [PMID: 34885580 PMCID: PMC8658854 DOI: 10.3390/ma14237425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 11/20/2022]
Abstract
Sodium-calcium-phosphate based oxynitride glasses and glass-ceramics doped with Mg, Si, and Nb were studied in vitro in simulated body fluid (SBF) under static conditions. The release of ions and pH changes up to 7 days of immersion were investigated. The nitrogen incorporation into phosphate glass matrix was found to notably influence in vitro dissolution only of homogenous glasses. Increasing the nitrogen content in the samples decreased the mean mass loss, while the niobate incorporation increased it. The correlation between the nitrogen content and increase in pH of SBF was also observed. The presence of phosphates crystallites was found to support the dissolution process at the beginning step (up to 3 days).
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Affiliation(s)
- Natalia Anna Wójcik
- Advanced Materials Center, Institute of Nanotechnology and Materials Engineering, Gdańsk University of Technology, 11/12 G. Narutowicza Street, 80-233 Gdańsk, Poland
- Department of Built Environment and Energy Technology, Linnaeus University, 35195 Växjö, Sweden; (S.A.); (B.J.)
- Correspondence: ; Tel.: +48-58348-6606
| | - Polina Sinitsyna
- Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Piispankatu 8, 20500 Turku, Finland; (P.S.); (L.H.)
| | - Sharafat Ali
- Department of Built Environment and Energy Technology, Linnaeus University, 35195 Växjö, Sweden; (S.A.); (B.J.)
| | - Leena Hupa
- Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Piispankatu 8, 20500 Turku, Finland; (P.S.); (L.H.)
| | - Bo Jonson
- Department of Built Environment and Energy Technology, Linnaeus University, 35195 Växjö, Sweden; (S.A.); (B.J.)
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Epasto LM, Georges T, Selimović A, Guigner JM, Azaïs T, Kurzbach D. Formation and Evolution of Nanoscale Calcium Phosphate Precursors under Biomimetic Conditions. Anal Chem 2021; 93:10204-10211. [PMID: 34251166 PMCID: PMC8319911 DOI: 10.1021/acs.analchem.1c01561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Simulated body fluids (SBFs) that mimic human blood plasma are widely used media for in vitro studies in an extensive array of research fields, from biomineralization to surface and corrosion sciences. We show that these solutions undergo dynamic nanoscopic conformational rearrangements on the timescale of minutes to hours, even though they are commonly considered stable or metastable. In particular, we find and characterize nanoscale inhomogeneities made of calcium phosphate (CaP) aggregates that emerge from homogeneous SBFs within a few hours and evolve into prenucleation species (PNS) that act as precursors in CaP crystallization processes. These ionic clusters consist of ∼2 nm large spherical building units that can aggregate into suprastructures with sizes of over 200 nm. We show that the residence times of phosphate ions in the PNS depend critically on the total PNS surface. These findings are particularly relevant for understanding nonclassical crystallization phenomena, in which PNS are assumed to act as building blocks for the final crystal structure.
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Affiliation(s)
- Ludovica M Epasto
- Faculty of Chemistry, Institute of Biological Chemistry, University Vienna, Währinger Str. 38, 1090 Vienna, Austria
| | - Tristan Georges
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 4, Place Jussieu, F-75005 Paris, France
| | - Albina Selimović
- Faculty of Chemistry, Institute of Biological Chemistry, University Vienna, Währinger Str. 38, 1090 Vienna, Austria
| | - Jean-Michel Guigner
- Institut de Minéralogie et Physique des Milieux Condensés (IMPMC), Sorbonne Université, 4, Place Jussieu, F-75005 Paris, France
| | - Thierry Azaïs
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 4, Place Jussieu, F-75005 Paris, France
| | - Dennis Kurzbach
- Faculty of Chemistry, Institute of Biological Chemistry, University Vienna, Währinger Str. 38, 1090 Vienna, Austria
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Gleeson SE, Kim S, Qian Q, Yu T, Marcolongo M, Li CY. Biomimetic Mineralization of Hierarchical Nanofiber Shish-Kebabs in a Concentrated Apatite-Forming Solution. ACS APPLIED BIO MATERIALS 2021. [DOI: 10.1021/acsabm.0c01133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sarah E. Gleeson
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Seyong Kim
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Qian Qian
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Tony Yu
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Michele Marcolongo
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
- Department of Mechanical Engineering, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Christopher Y. Li
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
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5
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Acri TM, Laird NZ, Jaidev LR, Meyerholz DK, Salem AK, Shin K. Nonviral Gene Delivery Embedded in Biomimetically Mineralized Matrices for Bone Tissue Engineering. Tissue Eng Part A 2020; 27:1074-1083. [PMID: 33086991 DOI: 10.1089/ten.tea.2020.0206] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Research in bone tissue engineering aims to design materials that are effective at generating bone without causing significant side effects. The osteogenic potential of combining matrices and protein growth factors has been well documented, however, improvements are necessary to achieve optimal therapeutic benefits upon clinical translation. In this article, rat calvarial defects were treated with gene-activated matrices (GAMs). The GAMs used were collagen sponges mineralized with a simulated body fluid (SBF) containing a nonviral gene delivery system. Both in vitro and in vivo studies were performed to determine the optimal mode of gene delivery. After 6 weeks, the defects were extracted to assess bone formation and tissue quality through histological and microcomputed tomography analyses. The optimal GAM consisted of a collagen sponge with polyethylenimine plasmid DNA (PEI-pDNA) complexes embedded in a calcium phosphate coating produced by SBF, which increased total bone formation by 39% compared with 19% for control samples. A follow-up in vivo study was performed to optimize the ratio of growth factors included in the GAM. The optimal ratio for supporting bone formation after 6 weeks of implantation was five parts of pBMP-2 to three parts pFGF-2. These studies demonstrated that collagen matrices biomimetically mineralized and activated with plasmids encoding fibroblast growth factor-2 (FGF-2) and bone morphogenetic protein-2 (BMP-2) can optimally improve bone regeneration outcomes. Impact statement Bone tissue engineering has explored both nonviral gene delivery and the concept of biomimetic mineralization. In this study, we combined these two concepts to further enhance bone regeneration outcomes. We demonstrated that embedding polyethylenimine (PEI)-based gene delivery within a mineral layer formed from simulated body fluid (SBF) immersion can increase bone formation rates. We also demonstrated that the ratio of growth factors utilized for matrix fabrication can impact the amount of bone formed in the defect site. This research highlights a combined approach using SBF and nonviral gene delivery both in vitro and in vivo and prepares the way for future optimization of synthetic gene activated matrices.
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Affiliation(s)
- Timothy M Acri
- Department of Pharmaceutical Sciences and Experimental Therapeutics, University of Iowa College of Pharmacy, Iowa City, Iowa, USA
| | - Noah Z Laird
- Department of Pharmaceutical Sciences and Experimental Therapeutics, University of Iowa College of Pharmacy, Iowa City, Iowa, USA
| | - Leela R Jaidev
- Department of Pharmaceutical Sciences and Experimental Therapeutics, University of Iowa College of Pharmacy, Iowa City, Iowa, USA
| | - David K Meyerholz
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Aliasger K Salem
- Department of Pharmaceutical Sciences and Experimental Therapeutics, University of Iowa College of Pharmacy, Iowa City, Iowa, USA
| | - Kyungsup Shin
- Department of Orthodontics, University of Iowa College of Dentistry and Dental Clinics, Iowa City, Iowa, USA
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Golafshan N, Alehosseini M, Ahmadi T, Talebi A, Fathi M, Kharaziha M, Orive G, Castilho M, Dolatshahi-Pirouz A. Combinatorial fluorapatite-based scaffolds substituted with strontium, magnesium and silicon ions for mending bone defects. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 120:111611. [PMID: 33545811 DOI: 10.1016/j.msec.2020.111611] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 10/01/2020] [Accepted: 10/07/2020] [Indexed: 12/17/2022]
Abstract
In bone tissue engineering, ionic doping using bone-related minerals such as magnesium (Mg) or strontium (Sr) is a promising strategy to make up for the inherent disadvantages (low solubility) of various apatite-based materials (such as fluorapatite (FAp) and hydroxyapatite (HA)). Therefore, some studies in recent years have tried to address the lack-of-methodology to improve the properties of bioceramics in the field. Even though the outcome of the studies has shown some promises, the influence of doped elements on the structures and properties of in-vitro and in-vivo mineralized FAp has not been investigated in detail so far. Thus, it is still an open question mark in the field. In this work, strontium modified fluorapatite (Sr-FAp), magnesium and silicon modified fluorapatite (Mg-SiFAp) bioceramics were synthesized using a mechanical alloying methodology. Results showed that the doped elements could decrease the crystallinity of FAp (56%) to less than 45% and 39% for Sr-FAp and Mg-SiFAp, respectively. Moreover, in-vitro studies revealed that Sr-FAp significantly enhanced osteogenic differentiation of hMSCs, after 21 days of culture, compared to Mg-SiFAp at both osteogenic and normal media. Then, in vivo bone formation in a defect of rat femur filled with a Sr-FAp and Mg-SiFAp compared to empty defect was investigated. Histological analysis revealed an increase in bone formation three weeks after implanting Sr-FAp compared to Mg-SiFAp and the empty defect. These results suggest that compared to magnesium and silicon, strontium ion significantly promotes bone formation in fluorapatite, making it appropriate for filling bone defects.
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Affiliation(s)
- Nasim Golafshan
- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Department of Orthopaedics, University Medical Center Utrecht, GA Utrecht, the Netherlands
| | - Morteza Alehosseini
- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Technical University of Denmark, DTU Health Tech, Center for Intestinal Absorption and Transport of Biopharmaceuticals, 2800 Kgs, Denmark
| | - Tahmineh Ahmadi
- Department of Materials Engineering, Shahreza Branch, Islamic Azad University, Shahreza, Iran.
| | - Ardeshir Talebi
- Department of Pathology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammadhossein Fathi
- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Mahshid Kharaziha
- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Gorka Orive
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, Vitoria-Gasteiz 01006, Spain; Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Spain; University Institute for Regenerative Medicine and Oral Implantology, UIRMI (UPV/EHU-Fundación Eduardo Anitua), Vitoria, Spain; Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore.
| | - Miguel Castilho
- Department of Orthopaedics, University Medical Center Utrecht, GA Utrecht, the Netherlands; Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Alireza Dolatshahi-Pirouz
- Technical University of Denmark, DTU Health Tech, Center for Intestinal Absorption and Transport of Biopharmaceuticals, 2800 Kgs, Denmark; Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Department of Dentistry - Regenerative Biomaterials, Philips van Leydenlaan 25, 6525EX Nijmegen, the Netherlands
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Gourgas O, Cole GB, Muiznieks LD, Sharpe S, Cerruti M. Effect of the Ionic Concentration of Simulated Body Fluid on the Minerals Formed on Cross-Linked Elastin-Like Polypeptide Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15364-15375. [PMID: 31729882 DOI: 10.1021/acs.langmuir.9b02542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Deposition of calcium phosphate minerals on the elastin-rich medial layers of arteries can cause severe cardiovascular complications. There are no available treatments for medial calcification, and the mechanism of mineral formation on elastin layers is still unknown. We recently developed an in vitro model of medial calcification using cross-linked elastin-like polypeptide (ELP) membranes immersed in simulated body fluid (SBF). While mineral phase evolution matched that observed in a mouse model of medial calcification, the long incubation required was a practical limitation of this model. Using higher SBF ion concentrations could be a solution to speed up mineral deposition, but its effect on the mineralization process is still not well understood. Here we analyze mineral formation and phase transformation on ELP membranes immersed in high concentration SBF. We show that while mineral deposition is significantly accelerated in these conditions, the chemistry and morphology of the minerals deposited on the ELP membranes and the overall mineralization process are strongly affected. Overall, this work suggests that while the use of low concentration SBF in this in vitro model is more appropriate to study medial calcification associated with the loss of calcification inhibitors, higher SBF ion concentration may be more relevant to study medial calcification in patients with life-threatening diseases such as chronic kidney disease.
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Affiliation(s)
- Ophélie Gourgas
- Department of Mining and Materials Engineering , McGill University , Montreal , Quebec H3A 0C5 , Canada
| | - Gregory B Cole
- Molecular Medicine , Hospital for Sick Children , Toronto , Ontario M5G 0A4 , Canada
- Department of Biochemistry , University of Toronto , Toronto , Ontario M5S 1A8 , Canada
| | - Lisa D Muiznieks
- Molecular Medicine , Hospital for Sick Children , Toronto , Ontario M5G 0A4 , Canada
| | - Simon Sharpe
- Molecular Medicine , Hospital for Sick Children , Toronto , Ontario M5G 0A4 , Canada
- Department of Biochemistry , University of Toronto , Toronto , Ontario M5S 1A8 , Canada
| | - Marta Cerruti
- Department of Mining and Materials Engineering , McGill University , Montreal , Quebec H3A 0C5 , Canada
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8
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Acri TM, Laird NZ, Geary SM, Salem AK, Shin K. Effects of calcium concentration on nonviral gene delivery to bone marrow-derived stem cells. J Tissue Eng Regen Med 2019; 13:2256-2265. [PMID: 31677246 DOI: 10.1002/term.2971] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 09/17/2019] [Accepted: 09/26/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Calcium ions (Ca2+ ) influence natural bone healing, and calcium is frequently used in bone tissue engineering scaffolds and cements. Scaffolds can also incorporate gene delivery systems to further promote osteoblast differentiation. Thus, our goal was to identify if Ca2+ concentration affects the transfection of bone marrow stromal cells because these cells play a major role in bone healing and can infiltrate gene-activated scaffolds designed to promote bone growth. METHODS Bone marrow-derived mesenchymal stem cells (BMSCs) were cultured in media with Ca2+ concentrations ranging from 0 to 20 mM and transfected with polyethyleneimine-plasmid DNA (PEI-pDNA) complexes. Cell viability and transfection efficiency were determined using MTS assays and flow cytometry, respectively. PEI-pDNA complex localization in BMSCs was assessed using fluorescence microscopy. To determine BMSC differentiation, messenger RNA (mRNA) for osteocalcin and CBFA1 was quantified using real time-polymerase chain reaction (PCR). Calcium deposition was qualitatively assessed after three and 14 days using Alizarin Red staining. RESULT Our results indicate that Ca2+ levels between 8 and 12 mM positively impacted transfection of BMSCs with PEI-pDNA complexes in terms of cell viability and transfection efficiency. A Ca2+ concentration of 10 mM also increased the expression of an osteogenic gene, osteocalcin, when the cells were transfected with plasmid DNA encoding bone morphogenetic protein 2 (BMP-2). CONCLUSION Ca2+ at a 10 mM concentration can significantly reduce toxicity and enhance transfection efficiency when combined with PEI-pDNA complexes, and this combination can be specifically applied to further enhance the differentiation of BMSCs by using the combination of polyethyleneimine-plasmid bone morphogenetic protein 2 (PEI-pBMP-2) and 10 mM Ca2+ as compared with PEI-pBMP-2 alone.
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Affiliation(s)
- Timothy M Acri
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy University of Iowa, Iowa City, Iowa
| | - Noah Z Laird
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy University of Iowa, Iowa City, Iowa
| | - Sean M Geary
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy University of Iowa, Iowa City, Iowa
| | - Aliasger K Salem
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy University of Iowa, Iowa City, Iowa
| | - Kyungsup Shin
- Department of Orthodontics, College of Dentistry and Dental Clinics University of Iowa, Iowa City, Iowa
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9
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Gourgas O, Muiznieks LD, Bello DG, Nanci A, Sharpe S, Cerruti M. Cross-Linked Elastin-like Polypeptide Membranes as a Model for Medial Arterial Calcification. Biomacromolecules 2019; 20:2625-2636. [DOI: 10.1021/acs.biomac.9b00417] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Ophélie Gourgas
- Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
| | - Lisa D. Muiznieks
- Molecular Medicine, Hospital for Sick Children, Toronto, Ontario M5G 0A4, Canada
| | - Dainelys Guadarrama Bello
- Department of Stomatology, Faculty of Dental Medicine, Université de Montréal, Montreal, Quebec H3C 3J7, Canada
| | - Antonio Nanci
- Department of Stomatology, Faculty of Dental Medicine, Université de Montréal, Montreal, Quebec H3C 3J7, Canada
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montreal, Quebec H3C 3J7, Canada
| | - Simon Sharpe
- Molecular Medicine, Hospital for Sick Children, Toronto, Ontario M5G 0A4, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Marta Cerruti
- Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
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10
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Kaczmarek B, Sionkowska A, Kozlowska J, Osyczka A. New composite materials prepared by calcium phosphate precipitation in chitosan/collagen/hyaluronic acid sponge cross-linked by EDC/NHS. Int J Biol Macromol 2018; 107:247-253. [DOI: 10.1016/j.ijbiomac.2017.08.173] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/22/2017] [Accepted: 08/30/2017] [Indexed: 01/11/2023]
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Shin K, Acri T, Geary S, Salem AK. Biomimetic Mineralization of Biomaterials Using Simulated Body Fluids for Bone Tissue Engineering and Regenerative Medicine<sup/>. Tissue Eng Part A 2017; 23:1169-1180. [PMID: 28463603 DOI: 10.1089/ten.tea.2016.0556] [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] [Indexed: 12/26/2022] Open
Abstract
Development of synthetic biomaterials imbued with inorganic and organic characteristics of natural bone that are capable of promoting effective bone tissue regeneration is an ongoing goal of regenerative medicine. Calcium phosphate (CaP) has been predominantly utilized to mimic the inorganic components of bone, such as calcium hydroxyapatite, due to its intrinsic bioactivity and osteoconductivity. CaP-based materials can be further engineered to promote osteoinductivity through the incorporation of osteogenic biomolecules. In this study, we briefly describe the microstructure and the process of natural bone mineralization and introduce various methods for coating CaP onto biomaterial surfaces. In particular, we summarize the advantages and current progress of biomimetic surface-mineralizing processes using simulated body fluids for coating bone-like carbonated apatite onto various material surfaces such as metals, ceramics, and polymers. The osteoinductive effects of integrating biomolecules such as proteins, growth factors, and genes into the mineral coatings are also discussed.
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Affiliation(s)
- Kyungsup Shin
- 1 Department of Orthodontics, College of Dentistry and Dental Clinics, University of Iowa , Iowa City, Iowa
| | - Timothy Acri
- 2 Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa , Iowa City, Iowa
| | - Sean Geary
- 2 Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa , Iowa City, Iowa
| | - Aliasger K Salem
- 2 Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa , Iowa City, Iowa
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12
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Guerzoni S, Deplaine H, El Haskouri J, Amorós P, Pradas MM, Edlund U, Ferrer GG. Combination of silica nanoparticles with hydroxyapatite reinforces poly (l-lactide acid) scaffolds without loss of bioactivity. J BIOACT COMPAT POL 2013. [DOI: 10.1177/0883911513513093] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Composite scaffolds of poly(l-lactide acid) and hydroxyapatite are of great interest in bone tissue engineering, but their mechanical properties are typically inferior to scaffolds of pure poly(l-lactide acid) due to agglomeration of the particles and weak interfacial component interaction. Fabrication strategies like double sonication of hydroxyapatite or increasing the amount of this inorganic filler do not effectively enhance the mechanical performance. In this study, poly(l-lactide acid) composites combining two types of fillers, mesoporous silica (SiO2) nanoparticles and hydroxyapatite, were developed to reinforce the poly(l-lactide acid) scaffold without any loss of bioactivity. A 5% addition of SiO2 nanoparticles to hydroxyapatite nanopowder and subjecting the scaffold formulation to double sonication increased the Young’s modulus from 5 MPa (pure poly(l-lactide acid) scaffold) to almost 7 MPa (poly(l-lactide acid)/hydroxyapatite/SiO2 scaffold). In addition, the composite was able to deposit a layer of biomimetic hydroxyapatite both on the surface and interior of the scaffold after 21 days of immersion in a simulated body fluid. The manufacturing method was straightforward and economically viable and does not require any chemical modification of the particles’ surfaces.
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Affiliation(s)
- Samuele Guerzoni
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, València, Spain
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Harmony Deplaine
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, València, Spain
| | - Jamal El Haskouri
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), València, Spain
| | - Pedro Amorós
- Institut de Ciència dels Materials de la Universitat de València (ICMUV), València, Spain
| | - Manuel Monleón Pradas
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, València, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Zaragoza, Spain
| | - Ulrica Edlund
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Gloria Gallego Ferrer
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, València, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Zaragoza, Spain
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Mantripragada VP, Lecka-Czernik B, Ebraheim NA, Jayasuriya AC. An overview of recent advances in designing orthopedic and craniofacial implants. J Biomed Mater Res A 2013; 101:3349-64. [PMID: 23766134 PMCID: PMC4854641 DOI: 10.1002/jbm.a.34605] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 01/11/2013] [Accepted: 01/11/2013] [Indexed: 01/22/2023]
Abstract
Great deal of research is still going on in the field of orthopedic and craniofacial implant development to resolve various issues being faced by the industry today. Despite several disadvantages of the metallic implants, they continue to be used, primarily because of their superior mechanical properties. In order to minimize the harmful effects of the metallic implants and its by-products, several modifications are being made to these materials, for instance nickel-free stainless steel, cobalt-chromium and titanium alloys are being introduced to eliminate the toxic effects of nickel being released from the alloys, introduce metallic implants with lower modulus, reduce the cost of these alloys by replacing rare elements with less expensive elements etc. New alloys like tantalum, niobium, zirconium, and magnesium are receiving attention given their satisfying mechanical and biological properties. Non-oxide ceramics like silicon nitride and silicon carbide are being currently developed as a promising implant material possessing a combination of properties such as good wear and corrosion resistance, increased ductility, good fracture and creep resistance, and relatively high hardness in comparison to alumina. Polymer/magnesium composites are being developed to improve mechanical properties as well as retain polymer's property of degradation. Recent advances in orthobiologics are proving interesting as well. This paper thus deals with the latest improvements being made to the existing implant materials and includes new materials being introduced in the field of biomaterials.
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14
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Inorganic coatings for optimized non-viral transfection of stem cells. Sci Rep 2013; 3:1567. [PMID: 23535735 PMCID: PMC3610100 DOI: 10.1038/srep01567] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 03/06/2013] [Indexed: 12/14/2022] Open
Abstract
“Biomimetic” approaches for heterogeneous growth of inorganic coatings have become particularly widespread in biomedical applications, where calcium phosphate (CaP) mineral coatings are used to improve biomedical implants. Changes in coating properties can influence the effects of mineral coatings on adjacent cells, but to date it has not been practical to systematically vary inorganic coating properties to optimize specific cell behaviors. Here, we present an approach to grow CaP mineral coatings in an enhanced throughput format to identify unprecedented capabilities in non-viral gene delivery. Subtle changes in coating properties resulted in widely variable transfection, and optimized coatings led to greater than 10-fold increases in transgene expression by multiple target cell types when compared to standard techniques. The enhanced transfection observed here is substrate-mediated, and related to the characteristics of the local environment near the surface of dissolving mineral coatings. These findings may be particularly translatable to medical device applications.
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15
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Melville H, Carpiniello M, Hollis K, Staffaroni A, Golestaneh N. Stem cells: a new paradigm for disease modeling and developing therapies for age-related macular degeneration. J Transl Med 2013; 11:53. [PMID: 23452406 PMCID: PMC3599723 DOI: 10.1186/1479-5876-11-53] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 02/19/2013] [Indexed: 02/06/2023] Open
Abstract
Age-related macular degeneration (AMD) is the leading cause of blindness in people over age 55 in the U.S. and the developed world. This condition leads to the progressive impairment of central visual acuity. There are significant limitations in the understanding of disease progression in AMD as well as a lack of effective methods of treatment. Lately, there has been considerable enthusiasm for application of stem cell biology for both disease modeling and therapeutic application. Human embryonic stem cells and induced pluripotent stem cells (iPSCs) have been used in cell culture assays and in vivo animal models. Recently a clinical trial was approved by FDA to investigate the safety and efficacy of the human embryonic stem cell-derived retinal pigment epithelium (RPE) transplantation in sub-retinal space of patients with dry AMD These studies suggest that stem cell research may provide both insight regarding disease development and progression, as well as direction for therapeutic innovation for the millions of patients afflicted with AMD.
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Affiliation(s)
- Heather Melville
- Georgetown University School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
| | - Matthew Carpiniello
- Georgetown University School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
| | - Kia Hollis
- Georgetown University School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
| | - Andrew Staffaroni
- Georgetown University School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
| | - Nady Golestaneh
- Georgetown University School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
- Department of Ophthalmology, Georgetown University, School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
- Department of Neurology, Georgetown University, School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, School of Medicine, 3900 Reservoir Rd, Washington, DC 20057, USA
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Yoo D. New paradigms in hierarchical porous scaffold design for tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:1759-72. [PMID: 23827634 DOI: 10.1016/j.msec.2012.12.092] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 12/10/2012] [Accepted: 12/28/2012] [Indexed: 11/16/2022]
Abstract
This paper presented an effective method for the three-dimensional (3D) hierarchical porous scaffold design for tissue engineering. To achieve such a hierarchical porous structure with accurately controlled internal pore architectures, the recursive intersection Boolean operation (RIBO) was proposed in order to satisfy computational efficiency and biological function requirements of a porous scaffold. After generating the distance field (DF) for the given anatomic model and required pore architectures, the recursive DF modifications enable us to design hierarchical porous scaffolds with complex combinations of pore morphologies. A variety of experimental results showed that the proposed hierarchical porous scaffold design method has the potential benefits for accurately controlling both the porosity and the pore architecture gradients while preserving the advantages of triply periodic minimal surface pore geometries.
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Affiliation(s)
- Dongjin Yoo
- Department of Computer Aided Mechanical Design Engineering, Daejin University, Sundan-dong, San 11-1, Pocheon-si 487-711, Republic of Korea.
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17
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Mineralization Potential of Electrospun PDO-Hydroxyapatite-Fibrinogen Blended Scaffolds. Int J Biomater 2012; 2012:159484. [PMID: 22956956 PMCID: PMC3431095 DOI: 10.1155/2012/159484] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Accepted: 07/05/2012] [Indexed: 11/17/2022] Open
Abstract
The current bone autograft procedure for cleft palate repair presents several disadvantages such as limited availability, additional invasive surgery, and donor site morbidity. The present preliminary study evaluates the mineralization potential of electrospun polydioxanone:nano-hydroxyapatite : fibrinogen (PDO : nHA : Fg) blended scaffolds in different simulated body fluids (SBF). Scaffolds were fabricated by blending PDO : nHA : Fg in the following percent by weight ratios: 100 : 0 : 0, 50 : 25 : 25, 50 : 50 : 0, 50 : 0 : 50, 0 : 0 : 100, and 0 : 50 : 50. Samples were immersed in (conventional (c), revised (r), ionic (i), and modified (m)) SBF for 5 and 14 days to induce mineralization. Scaffolds were characterized before and after mineralization via scanning electron microscopy, Alizarin Red-based assay, and modified burnout test. The addition of Fg resulted in scaffolds with smaller fiber diameters. Fg containing scaffolds also induced sheet-like mineralization while individual fiber mineralization was noticed in its absence. Mineralized electrospun Fg scaffolds without PDO were not mechanically stable after 5 days in SBF, but had superior mineralization capabilities which produced a thick bone-like mineral (BLM) layer throughout the scaffolds. 50 : 50 : 0 scaffolds incubated in either r-SBF for 5 days or c-SBF for 14 days produced scaffolds with high mineral content and individual-mineralized fibers. These mineralized scaffolds were still porous and will be further optimized as an effective bone substitute in future studies.
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18
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Luong LN, Ramaswamy J, Kohn DH. Effects of osteogenic growth factors on bone marrow stromal cell differentiation in a mineral-based delivery system. Biomaterials 2011; 33:283-94. [PMID: 22014945 DOI: 10.1016/j.biomaterials.2011.09.052] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Accepted: 09/21/2011] [Indexed: 11/25/2022]
Abstract
Delivering growth factors from bone-like mineral combines osteoinductivity with osteoconductivity. The effects of individual and sequential exposure of BMP-2 and FGF-2 on osteogenic differentiation, and their release from apatite were studied to design a dual delivery system. Bone marrow stromal cells were seeded on TCPS with the addition of FGF-2 (2.5, 10, 40 ng/ml) or BMP-2 (50, 150, 450 ng/ml) for 6 days. DNA content and osteogenic response were examined weekly for 3 weeks. FGF-2 increased DNA content; however, high concentrations of FGF-2 inhibited/delayed osteogenic differentiation, while a threshold concentration of BMP-2 was required for significant osteogenic enhancement. The sequence of delivery of BMP-2 (300 ng/ml) and FGF-2 (2.5 ng/ml) also had a significant impact on osteogenic differentiation. Delivery of FGF-2 followed by BMP-2 or delivery of BMP-2 followed by BMP-2 and FGF-2 enhanced osteogenic differentiation compared to the simultaneous delivery of both factors. Release of BMP-2 and FGF-2 from bone-like mineral was significantly affected by the concentration used during coprecipitation. BMP-2 also demonstrated a higher "burst" release compared to FGF-2. By integrating the results of the sequential delivery of BMP-2 and FGF-2 in solution, with the release of individual growth factors from mineral, an organic/inorganic delivery system based on coprecipitation can be designed for multiple biomolecules.
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Affiliation(s)
- Linh N Luong
- Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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19
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Abstract
In this paper, the authors describe a rapid prototyping method to produce vascularized tissue such as liver scaffold for tissue engineering applications. A scaffold with an interconnected channel was designed using a CAD environment. The data were transferred to a Polyjet 3D Printing machine (Eden 250, Object, Israel) to generate the models. Based on the 3D Printing model, a PDMS (polydimethyl-silicone) mould was created which can be used to cast the biodegradable material. The advantages and limitations of Rapid Prototyping (RP) techniques as well as the future direction of RP development in tissue engineering scaffold fabrication were reviewed.
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Jayasuriya AC, Kibbe S. Rapid biomineralization of chitosan microparticles to apply in bone regeneration. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:393-398. [PMID: 19756963 DOI: 10.1007/s10856-009-3874-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Accepted: 09/09/2009] [Indexed: 05/28/2023]
Abstract
The aim of this study was to prepare bone like mineral (BLM) layers rapidly on the exterior surfaces of chitosan (CS) microparticles (MPs). The CS MPs were fabricated using a scale-up double emulsification method. The CS MPs were in the spherical shape and the size of 30-60 microm. The MPs were then placed in 5x concentrated simulated body fluid (5 x SBF) and allowed to undergo biomineralization to form a BLM layers on the surface of CS MPs at 37 degrees C over a 24 h period. The BML layers on the exterior surface of CS MPs were characterized using wide angle X-ray diffraction (XRD), Fourier transform infrared microscopy (FTIR), and scanning electron microscopy (SEM). Insulin like growth factor-1 (IGF-1) was dissolved at a concentration of 1 microg/ml in 5 x SBF to incorporate into the BLM layer. The CS MPs (100 mg) were incubated in a sample of 4 ml of 5 x SBF containing IGF-1 at a concentration of 1 microg/ml for 24 h. The IGF-1 release from BML layers on CS MPs were studied by placing MPs in 4 ml of phosphate buffered saline (PBS) and incubating MPs at 37 degrees C for 30 days. Samples (100 microl) were taken over the course of the 30 days and analyzed using Enzyme-linked Immunosorbent assay (ELISA). The release IGF-1 from BML layers was in a burst manner followed by a sustained release during the 30-day period. This study suggests that the CS MPs have the potential to be used to help deliver therapeutic drugs to localized areas and hence increase and accelerate bone growth.
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Affiliation(s)
- A Champa Jayasuriya
- Department of Orthopaedics, University of Toledo, 3065 Arlington Avenue, Dowling Hall # 2447, Toledo, OH, 43614-5807, USA.
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Abstract
Biomaterials, traditionally defined as materials used in medical devices, have been used since antiquity, but recently their degree of sophistication has increased significantly. Biomaterials made today are routinely information rich and incorporate biologically active components derived from nature. In the future, biomaterials will assume an even greater role in medicine and will find use in a wide variety of non-medical applications through biologically inspired design and incorporation of dynamic behaviour.
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Affiliation(s)
- Nathaniel Huebsch
- School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, 319 Pierce Hall, Cambridge, Massachusetts 02138, USA
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22
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Abstract
It has been generally accepted that tissue engineered constructs should closely resemble the in-vivo mechanical and structural properties of the tissues they are intended to replace. However, most scaffolds produced so far were isotropic porous scaffolds with non-characterized mechanical properties, different from those of the native healthy tissue. Tissues that are formed into these scaffolds are initially formed in the isotropic porous structure and since most tissues have significant anisotropic extracellular matrix components and concomitant mechanical properties, the formed tissues have no structural and functional relationships with the native tissues. The complete regeneration of tissues requires a second differentiation step after resorption of the isotropic scaffold. It is doubtful if the required plasticity for this remains present in already final differentiated tissue. It would be much more efficacious if the newly formed tissues in the scaffold could differentiate directly into the anisotropic organization of the native tissues. Therefore, anisotropic scaffolds that enable such a direct differentiation might be extremely helpful to realize this goal. Up to now, anisotropic scaffolds have been fabricated using modified conventional techniques, solid free-form fabrication techniques, and a few alternative methods. In this review we present the current status and discuss the procedures that are currently being used for anisotropic scaffold fabrication.
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Scheller EL, Krebsbach PH, Kohn DH. Tissue engineering: state of the art in oral rehabilitation. J Oral Rehabil 2009; 36:368-89. [PMID: 19228277 DOI: 10.1111/j.1365-2842.2009.01939.x] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
More than 85% of the global population requires repair or replacement of a craniofacial structure. These defects range from simple tooth decay to radical oncologic craniofacial resection. Regeneration of oral and craniofacial tissues presents a formidable challenge that requires synthesis of basic science, clinical science and engineering technology. Identification of appropriate scaffolds, cell sources and spatial and temporal signals (the tissue engineering triad) is necessary to optimize development of a single tissue, hybrid organ or interface. Furthermore, combining the understanding of the interactions between molecules of the extracellular matrix and attached cells with an understanding of the gene expression needed to induce differentiation and tissue growth will provide the design basis for translating basic science into rationally developed components of this tissue engineering triad. Dental tissue engineers are interested in regeneration of teeth, oral mucosa, salivary glands, bone and periodontium. Many of these oral structures are hybrid tissues. For example, engineering the periodontium requires growth of alveolar bone, cementum and the periodontal ligament. Recapitulation of biological development of hybrid tissues and interfaces presents a challenge that exceeds that of engineering just a single tissue. Advances made in dental interface engineering will allow these tissues to serve as model systems for engineering other tissues or organs of the body. This review will begin by covering basic tissue engineering principles and strategic design of functional biomaterials. We will then explore the impact of biomaterials design on the status of craniofacial tissue engineering and current challenges and opportunities in dental tissue engineering.
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Affiliation(s)
- E L Scheller
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI 48109-1078, USA
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The adsorption of preferential binding peptides to apatite-based materials. Biomaterials 2008; 30:1287-98. [PMID: 19095299 DOI: 10.1016/j.biomaterials.2008.11.008] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Accepted: 11/12/2008] [Indexed: 11/20/2022]
Abstract
The objective of this work was to identify peptide sequences with high affinity to bone-like mineral (BLM) to provide alternative design methods for functional bone regeneration peptides. Adsorption of preferential binding peptide sequences on four apatite-based substrates [BLM and three sintered apatite disks pressed from powders containing 0% CO(3)(2-) (HA), 5.6% CO(3)(2-) (CA5), 10.5% CO(3)(2-) (CA10)] with varied compositions and morphologies was investigated. A combination of phage display, ELISA, and computational modeling was used to elucidate three 12-mer peptide sequences APWHLSSQYSRT (A), STLPIPHEFSRE (S), and VTKHLNQISQSY (V), from 243 candidates with preferential adsorption on BLM and HA. Overall, peptides S and V have a significantly higher adsorption to the apatite-based materials in comparison to peptide A (for S vs. A, BLM p=0.001, CA5 p<0.001, CA10 p<0.001, HA p=0.038; for V vs. A, BLM p=0.006, CA5 p=0.033, CA10 p=0.029). FT-IR analysis displayed carbonate levels in CA5 and CA10 dropped to approximately 1.1-2.2% after sintering, whereas SEM imaging displayed CA5 and CA10 possess distinct morphologies. Adsorption results normalized to surface area indicate that small changes in carbonate percentage at a similar morphological scale did not provide enough carbonate incorporation to show statistical differences in peptide adsorption. Because the identified peptides (S and V) have preferential binding to apatite, their use can now be investigated in bone and dentin tissue engineering, tendon and ligament repair, and enamel formation.
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Jayasuriya AC, Shah C. Controlled release of insulin-like growth factor-1 and bone marrow stromal cell function of bone-like mineral layer-coated poly(lactic-co-glycolic acid) scaffolds. J Tissue Eng Regen Med 2008; 2:43-9. [PMID: 18361482 DOI: 10.1002/term.65] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Controlled release of growth factors or drugs provides great therapeutic advantages for bone defects which do not heal with normal therapeutic treatments. We have accelerated the deposition of bone-like mineral (BLM) on the surface of three-dimensional (3D) poly(lactic-co-glycolic acid) (PLGA) porous scaffolds to 36-48 h by modifying the biomimetic process parameters and applying surface treatments onto PLGA scaffolds. We used simulated body fluid containing insulin-like growth factor-1 (IGF-1; 1 microg/ml) to mineralize the PLGA scaffolds for 48 h. IGF-1 was co-precipitated with mineral on the surface of the PLGA scaffolds. IGF-1-incorporated mineralized scaffolds demonstrated slow controlled release over a 30 day period when they were incubated in phosphate-buffered saline (PBS) at 37 degrees C. Bone marrow stromal cell (BMSC) function on three different types of scaffolds, such as control (non-mineralized) scaffolds, mineralized scaffolds, and IGF-1-incorporated mineralized scaffolds was also investigated. BMSC attachment and proliferation was enhanced for IGF-1-incorporated mineralized scaffolds compared with controls during the culture period. BMSC differentiation was not changed during the culture period among the three groups of scaffolds, as assessed by alkaline phosphatase activity and osteocalcin assay. According to findings from this study, BLM has great potential to be used as a carrier for biological molecules for localized release applications as well as bone tissue-engineering applications.
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Jayasuriya AC, Shah C, Ebraheim NA, Jayatissa AH. Acceleration of biomimetic mineralization to apply in bone regeneration. Biomed Mater 2007; 3:015003. [PMID: 18458490 DOI: 10.1088/1748-6041/3/1/015003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The delivery of growth factors and therapeutic drugs into bone defects is a major clinical challenge. Biomimetically prepared bone-like mineral (BLM) containing a carbonated apatite layer can be used to deliver growth factors and drugs in a controlled manner. In the conventional biomimetic process, BLM can be deposited on the biodegradable polymer surfaces by soaking them in simulated body fluid (SBF) for 16 days or more. The aim of this study was to accelerate the biomimetic process of depositing BML in the polymer surfaces. We accelerated the deposition of mineral on 3D poly(lactic-co-glycolic acid) (PLGA) porous scaffolds to 36-48 h by modifying the biomimetic process parameters and applying surface treatments to PLGA scaffolds. The BLM was coated on scaffolds after surface treatments followed by incubation at 37 degrees C in 15 ml of 5x SBF. We characterized the BLM created using the accelerated biomineralization process with wide angle x-ray diffraction (XRD), Fourier transform infrared (FTIR) microscopy, and scanning electron microscopy (SEM). The FTIR and XRD analyses of mineralized scaffolds show similarities between biomimetically prepared BLM, and bone bioapatite and carbonated apatite. We also found that the BLM layer on the surface of scaffolds was stable even after 21 days immersed in Tris buffered saline and cell culture media. This study suggests that BLM was stable for at least 3 weeks in both media, and therefore, BLM has a potential for use as a carrier for biological molecules for localized release applications as well as bone tissue engineering applications.
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