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Dorozhkin SV. Calcium Orthophosphate (CaPO4) Containing Composites for Biomedical Applications: Formulations, Properties, and Applications. JOURNAL OF COMPOSITES SCIENCE 2024; 8:218. [DOI: 10.3390/jcs8060218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
The goal of this review is to present a wide range of hybrid formulations and composites containing calcium orthophosphates (abbreviated as CaPO4) that are suitable for use in biomedical applications and currently on the market. The bioactive, biocompatible, and osteoconductive properties of various CaPO4-based formulations make them valuable in the rapidly developing field of biomedical research, both in vitro and in vivo. Due to the brittleness of CaPO4, it is essential to combine the desired osteologic properties of ceramic CaPO4 with those of other compounds to create novel, multifunctional bone graft biomaterials. Consequently, this analysis offers a thorough overview of the hybrid formulations and CaPO4-based composites that are currently known. To do this, a comprehensive search of the literature on the subject was carried out in all significant databases to extract pertinent papers. There have been many formulations found with different material compositions, production methods, structural and bioactive features, and in vitro and in vivo properties. When these formulations contain additional biofunctional ingredients, such as drugs, proteins, enzymes, or antibacterial agents, they offer improved biomedical applications. Moreover, a lot of these formulations allow cell loading and promote the development of smart formulations based on CaPO4. This evaluation also discusses basic problems and scientific difficulties that call for more investigation and advancements. It also indicates perspectives for the future.
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Affiliation(s)
- Sergey V. Dorozhkin
- Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
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2
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Prihanto A, Muryanto S, Sancho Vaquer A, Schmahl WW, Ismail R, Jamari J, Bayuseno AP. In-depth knowledge of the low-temperature hydrothermal synthesis of nanocrystalline hydroxyapatite from waste green mussel shell ( Perna Viridis). ENVIRONMENTAL TECHNOLOGY 2024; 45:2375-2387. [PMID: 36695167 DOI: 10.1080/09593330.2023.2173087] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 01/18/2023] [Indexed: 06/17/2023]
Abstract
ABSTRACTThis study presents the use of a low-temperature hydrothermal method for extracting calcium sources from green mussel shell (P. Viridis) wastes and converting them into synthetic nanosized hydroxyapatite (HA). In this study, raw mussel shells were washed, pulverised, and sieved to start producing a fine calcium carbonate-rich powder. XRD quantitative analysis confirmed that the powder contains 97.6 wt. % aragonite. This powder was then calcined for 5 h at 900 °C to remove water, salt, and mud, yielding a calcium-rich feedstock with major minerals of calcite (68.7 wt.%), portlandite (24.7 wt.%), and minor aragonite (6.5 wt.%). The calcined powders were dissolved in aqueous stock solutions of HNO3 and NH4OH before hydrothermally reacting with phosphoric acid [(NH4)2HPO4], yielding pure, nanoscale (16-18 nm) carbonated HA crystals, according to XRD, FT-IR, and SEM analyses. The use of a low-temperature hydrothermal method for a feedstock powder produced by the calcination of low-cost mussel shell wastes would be a valuable processing approach for the industry's development of large-scale hydroxyapatite nanoparticle production.
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Affiliation(s)
- A Prihanto
- Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia
- Chemical Engineering Vocational Program, Catholic Polytechnic Mangun Wijaya, Semarang, Indonesia
| | - S Muryanto
- Department of Chemical Engineering, UNTAG University in Semarang, Semarang, Indonesia
| | - A Sancho Vaquer
- Department of Earth-and Environmental Sciences, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - W W Schmahl
- Department of Earth-and Environmental Sciences, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - R Ismail
- Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia
| | - J Jamari
- Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia
| | - A P Bayuseno
- Department of Mechanical Engineering, Diponegoro University, Semarang, Indonesia
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Li M, Wang M, Wei L, Werner A, Liu Y. Biomimetic calcium phosphate coating on medical grade stainless steel improves surface properties and serves as a drug carrier for orthodontic applications. Dent Mater 2023; 39:152-161. [PMID: 36610898 DOI: 10.1016/j.dental.2022.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 12/05/2022] [Accepted: 12/24/2022] [Indexed: 01/07/2023]
Abstract
OBJECTIVE Recently, stainless steel (SSL) miniscrew implants have been used in orthodontic clinics as temporary anchorage devices. Although they have excellent physical properties, their biocompatibility is relatively poor. Previously, our group developed a two-phase biomimetic calcium phosphate (BioCaP) coating that can significantly improve the biocompatibility of medical devices. This study aimed to improve the biocompatibility of SSL by coating SSL surface with the BioCaP coating. METHODS Titanium (Ti) discs and SSL discs (diameter: 5 mm, thickness: 1 mm) were used in this study. To form an amorphous layer, the Ti discs were immersed in a biomimetic modified Tyrode solution (BMT) for 24 h. The SSL discs were immersed in the same solution for 0 h, 12 h, 24 h, 36 h and 48 h. To form a crystalline layer, the discs were then immersed in a supersaturated calcium phosphate solution (CPS) for 48 h. The surface properties of the BioCaP coatings were analysed. In addition, bovine serum albumin (BSA) was incorporated into the crystalline layer during biomimetic mineralisation as a model protein. RESULTS The morphology, chemical composition and drug loading capacity of the BioCaP coating on smooth SSL were confirmed. This coating improved roughness and wettability of SSL surface. In vitro, with the extension of BMT coating period, the cell seeding efficiency, cell spreading area and cell proliferation on the BioCaP coating were increased. SIGNIFICANCE These in vitro results show that the BioCaP coating can improve surface properties of smooth medical grade SSL and serve as a carrier system for bioactive agents.
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Affiliation(s)
- Menghong Li
- Department of Oral Cell Biology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Amsterdam, the Netherlands
| | - Mingjie Wang
- Department of Oral Cell Biology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Amsterdam, the Netherlands
| | - Lingfei Wei
- Department of Oral Cell Biology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Amsterdam, the Netherlands; Department of Oral Implantology, Yantai Stomatological Hospital, Yantai, China; Department of Second Dental Center, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology; Shanghai Research Institute of Stomatology, China
| | - Arie Werner
- Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Amsterdam, the Netherlands
| | - Yuelian Liu
- Department of Oral Cell Biology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Amsterdam, the Netherlands.
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A Novel Approach to Bio-mineralization of Electrospun PCL Scaffolds by Protein and Hydroxyapatite Nanoparticles; Molecular Dynamics Simulation and in-vitro Evaluation. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Li M, Wu G, Wang M, Hunziker EB, Liu Y. Crystalline Biomimetic Calcium Phosphate Coating on Mini-Pin Implants to Accelerate Osseointegration and Extend Drug Release Duration for an Orthodontic Application. NANOMATERIALS 2022; 12:nano12142439. [PMID: 35889663 PMCID: PMC9324071 DOI: 10.3390/nano12142439] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/12/2022] [Accepted: 07/13/2022] [Indexed: 01/25/2023]
Abstract
Miniscrew implants (MSIs) have been widely used as temporary anchorage devices in orthodontic clinics. However, one of their major limitations is the relatively high failure rate. We hypothesize that a biomimetic calcium phosphate (BioCaP) coating layer on mini-pin implants might be able to accelerate the osseointegration, and can be a carrier for biological agents. A novel mini-pin implant to mimic the MSIs was used. BioCaP (amorphous or crystalline) coatings with or without the presence of bovine serum albumin (BSA) were applied on such implants and inserted in the metaphyseal tibia in rats. The percentage of bone to implant contact (BIC) in histomorphometric analysis was used to evaluate the osteoconductivity of such implants from six different groups (n=6 rats per group): (1) no coating no BSA group, (2) no coating BSA adsorption group, (3) amorphous BioCaP coating group, (4) amorphous BioCaP coating-incorporated BSA group, (5) crystalline BioCaP coating group, and (6) crystalline BioCaP coating-incorporated BSA group. Samples were retrieved 3 days, 1 week, 2 weeks, and 4 weeks post-surgery. The results showed that the crystalline BioCaP coating served as a drug carrier with a sustained release profile. Furthermore, the significant increase in BIC occurred at week 1 in the crystalline coating group, but at week 2 or week 4 in other groups. These findings indicate that the crystalline BioCaP coating can be a promising surface modification to facilitate early osseointegration and increase the success rate of miniscrew implants in orthodontic clinics.
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Affiliation(s)
- Menghong Li
- Department of Oral Cell Biology, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands; (M.L.); (G.W.); (M.W.)
| | - Gang Wu
- Department of Oral Cell Biology, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands; (M.L.); (G.W.); (M.W.)
| | - Mingjie Wang
- Department of Oral Cell Biology, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands; (M.L.); (G.W.); (M.W.)
| | - Ernst B. Hunziker
- Centre of Regenerative Medicine for Skeletal Tissues, Department of Clinical Research, University of Bern, 3010 Bern, Switzerland;
- Group for Bone Biology, Department of Clinical Research, University of Bern, 3010 Bern, Switzerland
| | - Yuelian Liu
- Department of Oral Cell Biology, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands; (M.L.); (G.W.); (M.W.)
- Correspondence: ; Tel.: +31-2-0598-0626
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Dorozhkin SV. Functionalized calcium orthophosphates (CaPO 4) and their biomedical applications. J Mater Chem B 2019; 7:7471-7489. [PMID: 31738354 DOI: 10.1039/c9tb01976f] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Due to the chemical similarity to natural calcified tissues (bones and teeth) of mammals, calcium orthophosphates (abbreviated as CaPO4) appear to be good biomaterials for creation of artificial bone grafts. However, CaPO4 alone have some restrictions, which limit their biomedical applications. Various ways have been developed to improve the properties of CaPO4 and their functionalization is one of them. Namely, since surfaces always form the interfaces between implanted grafts and surrounding tissues, the state of CaPO4 surfaces plays a crucial role in the survival of bone grafts. Although the biomedically relevant CaPO4 possess the required biocompatible properties, some of their properties could be better. For example, functionalization of CaPO4 to enhance cell attachment and cell material interactions has been developed. In addition, to prepare stable formulations from nanodimensional CaPO4 particles and prevent them from agglomerating, the surfaces of CaPO4 particles are often functionalized by sorption of special chemicals. Furthermore, there are functionalizations in which CaPO4 are exposed to various types of physical treatments. This review summarizes the available knowledge on CaPO4 functionalizations and their biomedical applications.
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Hamai R, Tsuchiya K, Suzuki O. Adsorption of Serum Albumin onto Octacalcium Phosphate in Supersaturated Solutions Regarding Calcium Phosphate Phases. MATERIALS 2019; 12:ma12142333. [PMID: 31340468 PMCID: PMC6678651 DOI: 10.3390/ma12142333] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/16/2019] [Accepted: 07/19/2019] [Indexed: 11/16/2022]
Abstract
Octacalcium phosphate (OCP) has been shown to enhance new bone formation, coupled with its own biodegradation, through osteoblasts and osteoclast-like cell activities concomitant with de novo hydroxyapatite (HA) formation and serum protein accumulation on its surface. However, the nature of the chemical environment surrounding OCP and how it affects its metabolism and regulates protein accumulation is unknown. The present study examined how the degree of supersaturation (DS) affects the bovine serum albumin (BSA) adsorption onto OCP in 150 mM Tris-HCl buffer at 37 °C and pH 7.4, by changing the Ca2+ ion concentration. The amount of BSA adsorbed onto OCP increased as the DS increased. In addition, the amount of newly formed calcium phosphate, which could be OCP, was increased, not only by increases in DS, but also at lower equilibrium concentrations of BSA. The increased adsorption capacity of BSA was likely related to the formation of calcium phosphate on the adsorbed OCP. Together the results suggested that the formation of new calcium phosphate crystals is dependent on both the DS value and the adsorbate protein concentration, which may control serum protein accumulation on the OCP surface in vivo.
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Affiliation(s)
- Ryo Hamai
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Kaori Tsuchiya
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Osamu Suzuki
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
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Masuda T, Maruyama H, Arai F, Anada T, Tsuchiya K, Fukuda T, Suzuki O. Application of an indicator-immobilized-gel-sheet for measuring the pH surrounding a calcium phosphate-based biomaterial. J Biomater Appl 2017; 31:1296-1304. [DOI: 10.1177/0885328217699108] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The present study was designed to investigate the local microenvironment of octacalcium phosphate in a granule form upon biomolecules adsorption utilizing an indicator-immobilized-gel-sheet for measuring pH. We previously showed that octacalcium phosphate enhances bone regeneration during its progressive hydrolysis into hydroxyapatite if implanted in bone defects. The gel-sheet was made from a photocrosslinkable prepolymer solution, which can easily immobilize a pH indicator (bromothymol blue; BTB) in the hydrogel. The indicator-immobilized-gel-sheet was mounted on a biochip which was made of polydimethylsiloxane (PDMS) with a flow channel. The pH value was calculated by detecting the color changes in the gel-sheet and displayed as the pH distribution. After pre-adsorption of bovine albumin, β-lactoglobuline or cytochrome C onto octacalcium phosphate granules, the granules with the gel-sheet were further incubated in Tris-HCl buffer solution in the absence or presence of fluoride, known as an accelerator of octacalcium phosphate hydrolysis. pH values of the gel-sheet surrounding octacalcium phosphate granules showed a decrease from pH 7.4 to 6.6 in relation to the proteins adsorbed. Overall, the proposed pH-sensitive gel can be used to detect the pH around octacalcium phosphate granules with a high spatial resolution.
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Affiliation(s)
- Taisuke Masuda
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | | | - Fumihito Arai
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Takahisa Anada
- Graduate School of Dentistry, Tohoku University, Aoba-ku Sendai, Japan
| | - Kaori Tsuchiya
- Graduate School of Dentistry, Tohoku University, Aoba-ku Sendai, Japan
| | - Toshio Fukuda
- Faculty of Science and Technology, Meijo University, Nagoya, Japan
| | - Osamu Suzuki
- Graduate School of Dentistry, Tohoku University, Aoba-ku Sendai, Japan
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Civantos A, Martínez-Campos E, Ramos V, Elvira C, Gallardo A, Abarrategi A. Titanium Coatings and Surface Modifications: Toward Clinically Useful Bioactive Implants. ACS Biomater Sci Eng 2017; 3:1245-1261. [DOI: 10.1021/acsbiomaterials.6b00604] [Citation(s) in RCA: 182] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ana Civantos
- Tissue
Engineering Group, Institute of Biofunctional Studies, Associated
Unit to the Institute of Polymer Science and Technology (CSIC), Pharmacy
Faculty, Complutense University of Madrid (UCM), Paseo Juan XXIII 1, 28040 Madrid, Spain
- Polymer
Functionalization Group, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Enrique Martínez-Campos
- Tissue
Engineering Group, Institute of Biofunctional Studies, Associated
Unit to the Institute of Polymer Science and Technology (CSIC), Pharmacy
Faculty, Complutense University of Madrid (UCM), Paseo Juan XXIII 1, 28040 Madrid, Spain
- Polymer
Functionalization Group, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Viviana Ramos
- Tissue
Engineering Group, Institute of Biofunctional Studies, Associated
Unit to the Institute of Polymer Science and Technology (CSIC), Pharmacy
Faculty, Complutense University of Madrid (UCM), Paseo Juan XXIII 1, 28040 Madrid, Spain
- Noricum S.L., San Sebastián
de los Reyes, Av. Fuente Nueva, 14, 28703 Madrid, Spain
| | - Carlos Elvira
- Polymer
Functionalization Group, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Alberto Gallardo
- Polymer
Functionalization Group, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Ander Abarrategi
- Haematopoietic
Stem Cell Laboratory, The Francis Crick Institute, 1 Midland
Road, NW1 1AT London, U.K
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Dorozhkin SV. Calcium Orthophosphate-Containing Biocomposites and Hybrid Biomaterials for Biomedical Applications. J Funct Biomater 2015; 6:708-832. [PMID: 26262645 PMCID: PMC4598679 DOI: 10.3390/jfb6030708] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/31/2015] [Accepted: 08/01/2015] [Indexed: 12/30/2022] Open
Abstract
The state-of-the-art on calcium orthophosphate (CaPO4)-containing biocomposites and hybrid biomaterials suitable for biomedical applications is presented. Since these types of biomaterials offer many significant and exciting possibilities for hard tissue regeneration, this subject belongs to a rapidly expanding area of biomedical research. Through the successful combinations of the desired properties of matrix materials with those of fillers (in such systems, CaPO4 might play either role), innovative bone graft biomaterials can be designed. Various types of CaPO4-based biocomposites and hybrid biomaterials those are either already in use or being investigated for biomedical applications are extensively discussed. Many different formulations in terms of the material constituents, fabrication technologies, structural and bioactive properties, as well as both in vitro and in vivo characteristics have been already proposed. Among the others, the nano-structurally controlled biocomposites, those containing nanodimensional compounds, biomimetically fabricated formulations with collagen, chitin and/or gelatin, as well as various functionally graded structures seem to be the most promising candidates for clinical applications. The specific advantages of using CaPO4-based biocomposites and hybrid biomaterials in the selected applications are highlighted. As the way from a laboratory to a hospital is a long one and the prospective biomedical candidates have to meet many different necessities, the critical issues and scientific challenges that require further research and development are also examined.
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Lin X, de Groot K, Wang D, Hu Q, Wismeijer D, Liu Y. A review paper on biomimetic calcium phosphate coatings. Open Biomed Eng J 2015; 9:56-64. [PMID: 25893016 PMCID: PMC4391212 DOI: 10.2174/1874120701509010056] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 05/31/2014] [Accepted: 08/30/2014] [Indexed: 12/14/2022] Open
Abstract
Biomimetic calcium phosphate coatings have been developed for bone regeneration and repair because of their biocompatibility, osteoconductivity, and easy preparation. They can be rendered osteoinductive by incorporating an osteogenic agent, such as bone morphogenetic protein 2 (BMP-2), into the crystalline lattice work in physiological situations. The biomimetic calcium phosphate coating enables a controlled, slow and local release of BMP-2 when it undergoes cell mediated coating degradation induced by multinuclear cells, such as osteoclasts and foreign body giant cells, which mimics a physiologically similar release mode, to achieve sustained ectopic or orthotopic bone formation. Therefore, biomimetic calcium phosphate coatings are considered to be a promising delivery vehicle for osteogenic agents. In this review, we present an overview of biomimetic calcium phosphate coatings including their preparation techniques, physico-chemical properties, potential as drug carrier, and their pre-clinical application both in ectopic and orthotopic animal models. We briefly review some features of hydroxyapatite coatings and their clinical applications to gain insight into the clinical applications of biomimetic calcium phosphate coatings in the near future.
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Affiliation(s)
- X Lin
- Department of Oral Implantology, Academic Centre of Dentistry Amsterdam (ACTA), VU University and University of Amsterdam, Amsterdam, The Netherlands ; Department of Orthodontics, Affiliated Stomatological Hospital of Medical School, Nanjing University, Nanjing, China
| | - K de Groot
- Department of Oral Implantology, Academic Centre of Dentistry Amsterdam (ACTA), VU University and University of Amsterdam, Amsterdam, The Netherlands
| | - D Wang
- Department of Oral Implantology, Academic Centre of Dentistry Amsterdam (ACTA), VU University and University of Amsterdam, Amsterdam, The Netherlands
| | - Q Hu
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatological Hospital of Medical School, Nanjing University, Nanjing, China
| | - D Wismeijer
- Department of Oral Implantology, Academic Centre of Dentistry Amsterdam (ACTA), VU University and University of Amsterdam, Amsterdam, The Netherlands
| | - Y Liu
- Department of Oral Implantology, Academic Centre of Dentistry Amsterdam (ACTA), VU University and University of Amsterdam, Amsterdam, The Netherlands
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Patel KD, Kim TH, Lee EJ, Han CM, Lee JY, Singh RK, Kim HW. Nanostructured biointerfacing of metals with carbon nanotube/chitosan hybrids by electrodeposition for cell stimulation and therapeutics delivery. ACS APPLIED MATERIALS & INTERFACES 2014; 6:20214-24. [PMID: 25325144 DOI: 10.1021/am505759p] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Exploring the biological interfaces of metallic implants has been an important issue in achieving biofunctional success. Here we develop a biointerface with nanotopological features and bioactive composition, comprising a carbon nanotube (CNT) and chitosan (Chi) hybrid, via an electrophoretic deposition (EPD). The physicochemical properties, in vitro biocompatibility, and protein delivering capacity of the decorated nanohybrid layer were investigated, to address its potential usefulness as bone regenerating implants. Over a wide compositional range, the nanostructured hybrid interfaces were successfully formed with varying thicknesses, depending on the electrodeposition parameters. CNT-Chi hybrid interfaces showed a time-sequenced degradation in saline water, and a rapid induction of hydroxyapatite mineral in a simulated body fluid. The nanostructured hybrid substrates stimulated the initial adhesion events of the osteoblastic cells, including cell adhesion rate, spreading behaviors, and expression of adhesive proteins. The nanostructured hybrid interfaces significantly improved the adsorption of protein molecules, which was enabled by the surface charge interaction, and increased surface area of the nanotopology. Furthermore, the incorporated protein was released at a highly sustained rate, profiling a diffusion-controlled pattern over a couple of weeks, suggesting the possible usefulness as a protein delivery device. Collectively, the nanostructured hybrid CNT-Chi layer, implemented by an electrodeposition, is considered a biocompatible, cell-stimulating, and protein-delivering biointerface of metallic implants.
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Affiliation(s)
- Kapil D Patel
- Institute of Tissue Regeneration Engineering (ITREN), ‡Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, and §Department of Biomaterials Science, College of Dentistry, Dankook University , Cheonan 330-714, South Korea
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Elyada A, Garti N, Füredi-Milhofer H. Polyelectrolyte multilayer-calcium phosphate composite coatings for metal implants. Biomacromolecules 2014; 15:3511-21. [PMID: 25105729 DOI: 10.1021/bm5006245] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The preparation of organic-inorganic composite coatings with the purpose to increase the bioactivity of bioinert metal implants was investigated. As substrates, glass plates and rough titanium surfaces (Ti-SLA) were employed. The method comprises the deposition of polyelectrolyte multilayers (PEMLs) followed by immersion of the coated substrate into a calcifying solution of low supersaturation (MCS). Single or mixed PEMLs were constructed from poly-L-lysine (PLL) alternating with poly-L-glutamate, (PGA), poly-L-aspartate (PAA), and/or chondroitin sulfate (CS). ATR-FTIR spectra reveal that (PLL/PGA)10 multilayers and mixed multilayers with a (PLL/PGA)5 base contain intermolecular β-sheet structures, which are absent in pure (PLL/PAA)10 and (PLL/CS)10 assemblies. All PEML coatings had a grainy topography with aggregate sizes and size distributions increasing in the order: (PLL/PGA)n < (PLL/PAA)n < (PLL/CS)n. In mixed multilayers with a (PLL/PGA)n base and a (PLL/PAA)n or (PLL/CS)n top, the aggregate sizes were greatly reduced. The PEMLs promoted calcium phosphate nucleation and early crystal growth, the intensity of the effect depending on the composition of the terminal layer(s) of the polymer. In contrast, crystal morphology and structure depended on the supersaturation, pH, and ionic strength of the MCS, rather than on the composition of the organic matrix. Crystals grown on both uncoated and coated substrates were mostly platelets of calcium deficient carbonate apatite, with the Ca/P ratio depending on the precipitation conditions.
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Affiliation(s)
- Alon Elyada
- Casali Center for Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem , Edmond J. Safra Campus, Givat Ram, Jerusalem 9190401, Israel
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Zhu L, Liu H, Witkowska HE, Huang Y, Tanimoto K, Li W. Preferential and selective degradation and removal of amelogenin adsorbed on hydroxyapatites by MMP20 and KLK4 in vitro. Front Physiol 2014; 5:268. [PMID: 25104939 PMCID: PMC4109566 DOI: 10.3389/fphys.2014.00268] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 06/26/2014] [Indexed: 11/23/2022] Open
Abstract
The hardest tooth enamel tissue develops from a soft layer of protein-rich matrix, predominated by amelogenin that is secreted by epithelial ameloblasts in the secretory stage of tooth enamel development. During enamel formation, a well-controlled progressive removal of matrix proteins by resident proteases, Matrix metalloproteinase 20 (MMP20), and kallikrein 4 (KLK4), will provide space for the apatite crystals to grow. To better understand the role of amelogenin degradation in enamel biomineralization, the present study was conducted to investigate how the adsorption of amelogenin to hydroxyapatite (HAP) crystals affects its degradation by enamel proteinases, MMP20 and KLK4. Equal quantities of amelogenins confirmed by protein assays before digestions, either adsorbed to HAP or in solution, were incubated with MMP20 or KLK4. The digested samples collected at different time points were analyzed by spectrophotometry, SDS-PAGE, high performance liquid chromatography (HPLC), and LC-MALDI MS/MS. We found that majority of amelogenin adsorbed on HAP was released into the surrounding solution by enzymatic processing (88% for MMP20 and 98% for KLK4). The results show that as compared with amelogenin in solution, the HAP-bound amelogenin was hydrolyzed by both MMP20 and KLK4 at significantly higher rates. Using LC-MALDI MS/MS, more accessible cleavage sites and hydrolytic fragments from MMP20/KLK4 digestion were identified for the amelogenin adsorbed on HAP crystals as compared to the amelogenin in solution. These results suggest that the adsorption of amelogenin to HAP results in their preferential and selective degradation and removal from HAP by MMP20 and KLK4 in vitro. Based on these findings, a new degradation model related to enamel crystal growth is proposed.
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Affiliation(s)
- Li Zhu
- Department of Orofacial Sciences, School of Dentistry, University of California, San Francisco San Francisco, CA, USA
| | - Haichuan Liu
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco San Francisco, CA, USA
| | - H Ewa Witkowska
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco San Francisco, CA, USA
| | - Yulei Huang
- Department of Oral Medicine, Guanghua School of Stomatology, Sun Yat-sen University Guangdong, China
| | - Kataro Tanimoto
- Departments of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences Hiroshima, Japan
| | - Wu Li
- Department of Orofacial Sciences, School of Dentistry, University of California, San Francisco San Francisco, CA, USA
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Cellular performance comparison of biomimetic calcium phosphate coating and alkaline-treated titanium surface. BIOMED RESEARCH INTERNATIONAL 2013; 2013:832790. [PMID: 24455730 PMCID: PMC3884630 DOI: 10.1155/2013/832790] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Accepted: 11/28/2013] [Indexed: 01/22/2023]
Abstract
The influence of biomimetic calcium phosphate coating on osteoblasts behavior in vitro is not well established yet. In this study, we investigated the behavior of osteoblastic rat osteosarcoma 17/2.8 cells (ROS17/2.8) on two groups of biomaterial surfaces: alkaline-treated titanium surface (ATT) and biomimetic calcium phosphate coated ATT (CaP). The cell attachment, proliferation, differentiation, and morphology on these surfaces were extensively evaluated to reveal the impact of substrate surface on osteoblastic cell responses. It was found that the ROS17/2.8 cells cultured on the ATT surface had higher attachment and proliferation rates compared to those on the CaP surface. Our results also showed that the calcium phosphate coatings generated in this work have an inhibiting effect on osteoblast adhesion and further influenced the proliferation and differentiation of osteoblast compared to the ATT surface in vitro. Cells on the ATT surface also exhibited a higher alkaline phosphatase activity than on the CaP surface after two weeks of culture. Immunofluorescence staining and scanning electron microscopy results showed that the cells adhered and spread faster on the ATT surface than on the CaP surface. These results collectively suggested that substrate surface properties directly influence cell adhesion on different biomaterials, which would result in further influence on the cell proliferation and differentiation.
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Zakaria SM, Sharif Zein SH, Othman MR, Yang F, Jansen JA. Nanophase Hydroxyapatite as a Biomaterial in Advanced Hard Tissue Engineering: A Review. TISSUE ENGINEERING PART B-REVIEWS 2013; 19:431-41. [DOI: 10.1089/ten.teb.2012.0624] [Citation(s) in RCA: 170] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Siti Maisurah Zakaria
- School of Chemical Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal, Malaysia
| | | | - Mohd. Roslee Othman
- School of Chemical Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal, Malaysia
| | - Fang Yang
- Department of Biomaterials, College of Dental Science, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - John A. Jansen
- Department of Biomaterials, College of Dental Science, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Wang K, Leng Y, Lu X, Ren F. Calcium phosphate bioceramics induce mineralization modulated by proteins. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:3245-55. [DOI: 10.1016/j.msec.2013.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 03/29/2013] [Accepted: 04/01/2013] [Indexed: 10/27/2022]
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Song HJ, Park YJ, Moon WJ, Luong LN, Kohn DH. Effects of Protein-Simulated Body Fluid Mixing Methods on Characteristics of Bone-Like Mineral. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012; 32:2501-2507. [PMID: 23144533 DOI: 10.1016/j.msec.2012.07.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This study examined effects of protein mixing methods into modified simulated body fluid (mSBF) on the crystalline structure and morphology of bone-like mineral (BLM) coated on poly(lactic-co-glycolic acid) PLGA. Using bovine serum albumin (BSA) as a model protein, four sample groups were prepared: the N-BLM group was coated by soaking substrates in mSBF without BSA; the B-BLM group was coated by soaking in mSBF with BSA added immediately before soaking; the Ca-BLM group was coated by soaking in Ca-mSBF prepared by premixing BSA with a CaCl(2) solution before preparing the mSBF; the P-BLM group was coated by soaking in P-mSBF made by premixing the BSA with a KH(2)PO(4) solution. The B-BLM and Ca-BLM groups exhibited densely coated, thick BLM layers, whereas the P-BLM group exhibited loosely connected BLM clusters. The hydroxyapatite (HAp) crystallites of the B-BLM and Ca-BLM groups were aligned along the c-axis, but those of the P-BLM group were disordered and had a lower crystallinity. The alignment to the c-axis of Ca-BLM and the disordered orientation of P-BLM was caused by calcium ions bound to BSA in Ca-mSBF and phosphate ions bound to BSA in P-mSBF, respectively. These results show that the crystallinity and morphology of BLM can be controlled by the mixing of BSA in mSBF. The crystallinity of BLM is closely connected to its solubility. Therefore, the release characteristics of growth factors and cell regulation on BLM could be affected by the changes in the crystalinity of BLM.
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Affiliation(s)
- Ho-Jun Song
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Korea
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Yu X, Wang L, Jiang X, Rowe D, Wei M. Biomimetic CaP coating incorporated with parathyroid hormone improves the osseointegration of titanium implant. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2177-2186. [PMID: 22639151 DOI: 10.1007/s10856-012-4682-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Accepted: 05/11/2012] [Indexed: 06/01/2023]
Abstract
Parathyroid hormone (PTH) is a well-known therapeutic agent for osteoporosis treatment, however, the inconvenience of daily administration and side effect from systematic administration severely limits its application in clinic. PTH has been incorporated into a biomimetic calcium phosphate (CaP) coating via a co-precipitation method in a modified simulated body fluid. The aim of the current study is to evaluate the osseointegration response of PTH incorporated CaP coating on titanium implants. Implants with different doses of PTH were inserted into tibiae of mice and evaluated by X-ray, micro-CT, histology and back-scattered scanning electron microscopy. Improved osseointegration of the implants loaded with PTH was observed compared to CaP coating only after 28 days of implantation in mouse tibiae. Micro-CT analysis showed better bone integration around the implant incorporated with PTH. Bone area and bone contact evaluations have demonstrated that peri-implant bone regeneration is highly dependent on the dosage of PTH incorporated. The higher the PTH content, the more bone formed surrounding the implant. Therefore, our results suggest that biomimetic CaP coating could be a useful a carrier for PTH local delivery, which results in improved bone-to-implant integration.
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Affiliation(s)
- Xiaohua Yu
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA.
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Ekemen Z, Chang H, Ahmad Z, Bayram C, Rong Z, Denkbas EB, Stride E, Vadgama P, Edirisinghe M. Fabrication of Biomaterials via Controlled Protein Bubble Generation and Manipulation. Biomacromolecules 2011; 12:4291-300. [DOI: 10.1021/bm201202y] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zeynep Ekemen
- Department of Mechanical Engineering, University College London, Torrington Place, London
WC1E 7JE, United Kingdom
| | - Hong Chang
- IRC in Biomedical Materials, Queen Mary University of London, Mile End Road, London
E1 4NS, United Kingdom
| | - Zeeshan Ahmad
- School
of Pharmacy and Biomedical
Sciences, University of Portsmouth, St
Michael’s Building, White Swan Road, Portsmouth, PO1 2DT, United
Kingdom
| | - Cem Bayram
- Nanotechnology
and Nanomedicine
Division, The Institute For Graduate Studies in Science and Engineering, Hacettepe University, 06800, Ankara, Turkey
| | - Zimei Rong
- IRC in Biomedical Materials, Queen Mary University of London, Mile End Road, London
E1 4NS, United Kingdom
| | - Emir Baki Denkbas
- Nanotechnology
and Nanomedicine
Division, The Institute For Graduate Studies in Science and Engineering, Hacettepe University, 06800, Ankara, Turkey
| | - Eleanor Stride
- Department of Mechanical Engineering, University College London, Torrington Place, London
WC1E 7JE, United Kingdom
| | - Pankaj Vadgama
- IRC in Biomedical Materials, Queen Mary University of London, Mile End Road, London
E1 4NS, United Kingdom
| | - Mohan Edirisinghe
- Department of Mechanical Engineering, University College London, Torrington Place, London
WC1E 7JE, United Kingdom
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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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Bougas K, Stenport VF, Currie F, Wennerberg A. In vitro Evaluation of Calcium Phosphate Precipitation on Possibly Bioactive Titanium Surfaces in the Presence of Laminin. J Oral Maxillofac Res 2011; 2:e3. [PMID: 24421995 PMCID: PMC3886075 DOI: 10.5037/jomr.2011.2303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2011] [Accepted: 07/19/2011] [Indexed: 11/30/2022]
Abstract
Objectives The aim of the present study was to evaluate calcium phosphate precipitation
and the amount of precipitated protein on three potentially bioactive
surfaces when adding laminin in simulated body fluid. Material and Methods Blasted titanium discs were prepared by three different techniques claimed to
provide bioactivity: alkali and heat treatment (AH), anodic oxidation (AO)
or hydroxyapatite coating (HA). A blasted surface incubated in
laminin-containing simulated body fuid served as a positive control (B)
while a blasted surface incubated in non laminin-containing simulated body
fuid served as a negative control (B-). The immersion time was 1 hour, 24
hours, 72 hours and 1 week. Surface topography was investigated by
interferometry and morphology by Scanning Electron Microscopy (SEM).
Analysis of the precipitated calcium and phosphorous was performed by Energy
Dispersive X-ray Spectroscopy (EDX) and the adsorbed laminin was quantified
by iodine (125I) labeling. Results SEM demonstrated that all specimens except for the negative control were
totally covered with calcium phosphate (CaP) after 1 week. EDX revealed that
B- demonstrated lower sum of Ca and P levels compared to the other groups
after 1 week. Iodine labeling demonstrated that laminin precipitated in a
similar manner on the possibly bioactive surfaces as on the positive control
surface. Conclusions Our results indicate that laminin precipitates equally on all tested titanium
surfaces and may function as a nucleation center thus locally elevating the
calcium concentration. Nevertheless further studies are required to clarify
the role of laminin in the interaction of biomaterials with the host bone
tissue.
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Affiliation(s)
- Kostas Bougas
- Department of Prosthodontics, Faculty of Odontology, Malmö University Malmö Sweden. ; Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg Gothenburg Sweden
| | - Victoria Franke Stenport
- Department of Prosthodontics, Faculty of Odontology, Sahlgrenska Academy, University of Gothenburg Gothenburg Sweden. ; Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg Gothenburg Sweden
| | | | - Ann Wennerberg
- Department of Prosthodontics, Faculty of Odontology, Malmö University Malmö Sweden. ; Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg Gothenburg Sweden
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Abstract
The state-of-the-art of biocomposites and hybrid biomaterials based on calcium orthophosphates that are suitable for biomedical applications is presented in this review. Since these types of biomaterials offer many significant and exciting possibilities for hard tissue regeneration, this subject belongs to a rapidly expanding area of biomedical research. Through successful combinations of the desired properties of matrix materials with those of fillers (in such systems, calcium orthophosphates might play either role), innovative bone graft biomaterials can be designed. Various types of biocomposites and hybrid biomaterials based on calcium orthophosphates, either those already in use or being investigated for biomedical applications, are extensively discussed. Many different formulations, in terms of the material constituents, fabrication technologies, structural and bioactive properties as well as both in vitro and in vivo characteristics, have already been proposed. Among the others, the nanostructurally controlled biocomposites, those containing nanodimensional compounds, biomimetically fabricated formulations with collagen, chitin and/or gelatin as well as various functionally graded structures seem to be the most promising candidates for clinical applications. The specific advantages of using biocomposites and hybrid biomaterials based on calcium orthophosphates in the selected applications are highlighted. As the way from the laboratory to the hospital is a long one, and the prospective biomedical candidates have to meet many different necessities, this review also examines the critical issues and scientific challenges that require further research and development.
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Wang X, Ito A, Li X, Sogo Y, Oyane A. Signal molecules-calcium phosphate coprecipitation and its biomedical application as a functional coating. Biofabrication 2011; 3:022001. [PMID: 21474887 DOI: 10.1088/1758-5082/3/2/022001] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this review, the current knowledge of signal molecules-calcium phosphate coprecipitation and its biomedical application as a functional coating are described. Although signal molecules regulate a variety of cellular processes, it is difficult to sustain the regulation activity for a long term when the signal molecules are only injected in a free form. The signal molecules-calcium phosphate coprecipitation on a substrate surface is a very promising process to achieve sustained regulation activity of the signal molecules by controlled and localized delivery of the signal molecules to specific body sites (implantation sites). However, the significance of immobilizing signal molecules with calcium phosphate coatings and their biomedical application are not systematically illustrated. For this purpose, the presently existing coprecipitation methods and strategies on biomedical application are summarized and discussed.
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Affiliation(s)
- Xiupeng Wang
- Human Technology Research Institute, Higashi, Tsukuba, Ibaraki, Japan.
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Hägi TT, Enggist L, Michel D, Ferguson SJ, Liu Y, Hunziker EB. Mechanical insertion properties of calcium-phosphate implant coatings. Clin Oral Implants Res 2011; 21:1214-22. [PMID: 20546252 DOI: 10.1111/j.1600-0501.2010.01916.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To investigate the influence of protein incorporation on the resistance of biomimetic calcium-phosphate coatings to the shear forces that are generated during implant insertion. MATERIALS AND METHODS Thirty-eight standard (5 × 13 mm) Osseotite® implants were coated biomimetically with a layer of calcium phosphate, which either lacked or bore a co-precipitated (incorporated) depot of the model protein bovine serum albumin (BSA). The coated implants were inserted into either artificial bone (n=18) or the explanted mandibles of adult pigs (n=12). The former set-up was established for the measurement of torque and of coating losses during the insertion process. The latter set-up was established for the histological and histomorphometric analysis of the fate of the coatings after implantation. RESULTS BSA-bearing coatings had higher mean torque values than did those that bore no protein depot. During the insertion process, less material was lost from the former than from the latter type of coating. The histological and histomorphometric analysis revealed fragments of material to be sheared off from both types of coating at vulnerable points, namely, at the tips of the threads. The sheared-off fragments were retained within the peri-implant space. CONCLUSION The incorporation of a protein into a biomimetically prepared calcium-phosphate coating increases its resistance to the shear forces that are generated during implant insertion. In a clinical setting, the incorporated protein would be an osteogenic agent, whose osteoinductive potential would not be compromised by the shearing off of coating material, and the osteoconductivity of an exposed implant surface would not be less than that of a coated one.
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Affiliation(s)
- Tobias T Hägi
- Center of Regenerative Medicine for Skeletal Tissues, Department of Clinical Research, University of Bern, Bern, Switzerland
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Groot KD, Wen HB, Liu Y, Layrolle P, Barrere F. Biomimetic Coatings on Orthopedic Implants: a Review. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-599-109] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractIn bone replacement surgery, replacement of joints (of hip, knee, finger and jaw) is a major sub discipline, requiring mechanically strong and biologically compatible, or biocompatible, implants. Since mechanical strength can only be achieved with metals that lack the required biocompatibility, surface treatments to improve that lack have been studied extensively. Since the mineral phase of bone consists of various calcium salts, the most relevant one being (carbonated) apatite, the surface treatments of choice are coatings of such salts on orthopedic implants have been successfully developed. (Bulk ceramics of CaP are too brittle to be used for load bearing implants). Although currently used coatings as obtained by plasma spraying have been highly successful, the high temperature and line-of-sight nature of the plasma spray process prevent (1) coatings to be deposited on implants made of polymer composites, (2) coatings to be deposited on complex surfaces and/or within porous implants and (3) biological molecules such as growth factors or antibiotics to be included in the coating. Therefore, we and several other research groups have focussed our attention to so called biomimetic coatings, that are produced at ambient temperature by a precipitation process from fluids resembling body fluids in their inorganic composition. In this presentation, we will give a review of some current developments on biomimetic coatings.
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Kapoor R, Sistla PG, Kumar JM, Raj TA, Srinivas G, Chakraborty J, Sinha MK, Basu D, Pande G. Comparative assessment of structural and biological properties of biomimetically coated hydroxyapatite on alumina (alpha-Al2O3) and titanium (Ti-6Al-4V) alloy substrates. J Biomed Mater Res A 2010; 94:913-26. [PMID: 20730928 DOI: 10.1002/jbm.a.32767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Previous reports have shown the use of hydroxyapatite (HAp) and related calcium phosphate coatings on metal and nonmetal substrates for preparing tissue-engineering scaffolds, especially for osteogenic differentiation. These studies have revealed that the structural properties of coated substrates are dependent significantly on the method and conditions used for coating and also whether the substrates had been modified prior to the coating. In this article, we have done a comparative evaluation of the structural features of the HAp coatings, prepared by using simulated body fluid (SBF) at 25 degrees C for various time periods, on a nonporous metal substrate titanium-aluminium-vanadium (Ti-6Al-4V) alloy and a bioinert ceramic substrate alpha-alumina (alpha-Al(2)O(3)), with and without their prior treatment with the globular protein bovine serum albumin (BSA). Our analysis of these substrates by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared (FTIR) spectrometry showed significant and consistent differences in the quantitative and qualitative properties of the coatings. Interestingly, the bioactivity of these substrates in terms of supporting in vitro cell adhesion and spreading, and in vivo effects of implanted substrates, showed a predictable pattern, thus indicating that some coated substrates prepared under our conditions could be more suitable for biological/biomedical applications.
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Affiliation(s)
- Renu Kapoor
- Centre for Cellular and Molecular Biology, Hyderabad, Andhra Pradesh, India
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Schade R, Sikirić MD, Lamolle S, Ronold HJ, Lyngstadass SP, Liefeith K, Cuisinier F, Füredi-Milhofer H. Biomimetic organic-inorganic nanocomposite coatings for titanium implants. In vitro and in vivo biological testing. J Biomed Mater Res A 2010; 95:691-700. [DOI: 10.1002/jbm.a.32888] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Paital SR, He W, Dahotre NB. Laser pulse dependent micro textured calcium phosphate coatings for improved wettability and cell compatibility. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:2187-2200. [PMID: 20464459 DOI: 10.1007/s10856-010-4085-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Accepted: 04/15/2010] [Indexed: 05/29/2023]
Abstract
Surface wettability of an implant material is an important criterion in biological response as it controls the adsorption of proteins followed by attachment of cells to its surface. Hence, micro-textured calcium phosphate coatings with four length scales were synthesized on Ti-6Al-4V substrates by a laser cladding technique and their effects on wettability and cell adhesion were systematically evaluated. Microstructure and morphological evolutions of the coatings were studied using scanning electron and light optical microscopes respectively. The surface texture of coating defined in terms of a texture parameter was correlated to its wetting behavior. The contact angle of simulated body fluid measured by a static sessile drop technique, demonstrated an increased hydrophilicity with decreasing value of texture parameter. The influence of such textures on the in vitro bioactivity and in vitro biocompatibility were studied by the immersion of the samples in simulated body fluid and mouse MC3T3-E1 osteoblast-like cell culture respectively.
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Affiliation(s)
- Sameer R Paital
- Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
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31
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Chen C, Lee IS, Zhang SM, Yang HC. Biomimetic apatite formation on calcium phosphate-coated titanium in Dulbecco's phosphate-buffered saline solution containing CaCl(2) with and without fibronectin. Acta Biomater 2010; 6:2274-81. [PMID: 19962459 DOI: 10.1016/j.actbio.2009.11.033] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Revised: 11/22/2009] [Accepted: 11/29/2009] [Indexed: 11/30/2022]
Abstract
Calcium phosphate (CaP) thin films with different degrees of crystallinity were coated on the surfaces of commercially pure titanium by electron beam evaporation. The details of apatite nucleation and growth on the coating layer were investigated in Dulbecco's phosphate-buffered saline solutions containing calcium chloride (DPBS) or DPBS with fibronectin (DPBSF). The surfaces of the samples were examined by field emission scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The concentrations of fibronectin and calcium ions (Ca(2+)) were monitored by the bicinchoninic acid method (BCA) and use of a calcium assay kit (DICA-500), respectively. Apatite initially formed at the fastest rate on the CaP-coated samples with the lowest degree of crystallinity and reached the maximum Ca(2+) concentration after immersion in DPBS solution for 15min. After 15min the concentration of Ca(2+) decreased with the growth of apatite on the coating layers. For all the samples the maximum Ca(2+) concentration in the DPBS solutions decreased with increasing crystallinity and immersion time to reach the maximum concentration increased. The presence of fibronectin in the DPBS solutions delayed the formation and affected the morphology of the apatite. Fibronectin incorporated into apatite deposited on the surface of titanium did not affect its biological activity in terms of promoting osteoblast adhesion.
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Affiliation(s)
- Cen Chen
- Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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32
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Liu Y, Wu G, de Groot K. Biomimetic coatings for bone tissue engineering of critical-sized defects. J R Soc Interface 2010; 7 Suppl 5:S631-47. [PMID: 20484228 DOI: 10.1098/rsif.2010.0115.focus] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The repair of critical-sized bone defects is still challenging in the fields of implantology, maxillofacial surgery and orthopaedics. Current therapies such as autografts and allografts are associated with various limitations. Cytokine-based bone tissue engineering has been attracting increasing attention. Bone-inducing agents have been locally injected to stimulate the native bone-formation activity, but without much success. The reason is that these drugs must be delivered slowly and at a low concentration to be effective. This then mimics the natural method of cytokine release. For this purpose, a suitable vehicle was developed, the so-called biomimetic coating, which can be deposited on metal implants as well as on biomaterials. Materials that are currently used to fill bony defects cannot by themselves trigger bone formation. Therefore, biological functionalization of such materials by the biomimetic method resulted in a novel biomimetic coating onto different biomaterials. Bone morphogenetic protein 2 (BMP-2)-incorporated biomimetic coating can be a solution for a large bone defect repair in the fields of dental implantology, maxillofacial surgery and orthopaedics. Here, we review the performance of the biomimetic coating both in vitro and in vivo.
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Affiliation(s)
- Yuelian Liu
- Department of Oral Implantology and Prosthodontics, Academic Centre of Dentistry Amsterdam (ACTA), VU University and University of Amsterdam, Amsterdam, The Netherlands.
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Wu G, Liu Y, Iizuka T, Hunziker EB. Biomimetic coating of organic polymers with a protein-functionalized layer of calcium phosphate: the surface properties of the carrier influence neither the coating characteristics nor the incorporation mechanism or release kinetics of the protein. Tissue Eng Part C Methods 2010; 16:1255-65. [PMID: 20196638 DOI: 10.1089/ten.tec.2009.0588] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Polymers that are used in clinical practice as bone-defect-filling materials possess many essential qualities, such as moldability, mechanical strength and biodegradability, but they are neither osteoconductive nor osteoinductive. Osteoconductivity can be conferred by coating the material with a layer of calcium phosphate, which can be rendered osteoinductive by functionalizing it with an osteogenic agent. We wished to ascertain whether the morphological and physicochemical characteristics of unfunctionalized and bovine-serum-albumin (BSA)-functionalized calcium-phosphate coatings were influenced by the surface properties of polymeric carriers. The release kinetics of the protein were also investigated. Two sponge-like materials (Helistat® and Polyactive®) and two fibrous ones (Ethisorb™ and poly[lactic-co-glycolic acid]) were tested. The coating characteristics were evaluated using state-of-the-art methodologies. The release kinetics of BSA were monitored spectrophotometrically. The characteristics of the amorphous and the crystalline phases of the coatings were not influenced by either the surface chemistry or the surface geometry of the underlying polymer. The mechanism whereby BSA was incorporated into the crystalline layer and the rate of release of the truly incorporated depot were likewise unaffected by the nature of the polymeric carrier. Our biomimetic coating technique could be applied to either spongy or fibrous bone-defect-filling organic polymers, with a view to rendering them osteoconductive and osteoinductive.
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Affiliation(s)
- Gang Wu
- Centre of Regenerative Medicine for Skeletal Tissues, Department of Clinical Research, University of Bern, Bern, Switzerland
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Luong LN, McFalls KM, Kohn DH. Gene delivery via DNA incorporation within a biomimetic apatite coating. Biomaterials 2009; 30:6996-7004. [PMID: 19775750 DOI: 10.1016/j.biomaterials.2009.09.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Accepted: 09/03/2009] [Indexed: 11/18/2022]
Abstract
Integrating inductivity with conductivity in a material may advance tissue engineering. An organic/inorganic hybrid was developed by incorporating plasmid DNA encoding for the beta-gal gene complexed with Lipofectamine 2000 (DNA-Lipoplex) within apatite via coprecipitation. It was hypothesized that this system will result in enhanced transfection efficiency compared to DNA-Lipoplexes adsorbed to the mineral surface and DNA coprecipitated without Lipofectamine 2000. PLGA films were cast onto glass slips and apatite and DNA were coprecipitated in modified simulated body fluid (mSBF). DNA-Lipoplex presence in mineral, DNA-Lipoplex stability (vs. coprecipitation time), and transfection efficiency (determined with C3H10T1/2 cells) as a function of coprecipitation time, DNA-Lipoplex concentration, and DNA incorporation method were studied. DNA-Lipoplex presence and spatial distribution on apatite were confirmed through fluorescence. Transfection efficiency was highest for 6h of DNA-Lipoplex coprecipitation. Differences in transfection efficiency were found between the DNA concentrations, with the highest efficiency for coprecipitation being 40 microg/ml (p < or = 0.009 relative to other coprecipitation concentrations). Significant differences in transfection efficiency existed between incorporation methods (p < 0.05) with the highest efficiency for DNA-Lipoplex coprecipitation. This hybrid material system not only integrates inductivity provided by the DNA and conductivity provided by the apatite, but it also has significant implications in non-viral gene delivery due to its ability to increase transfection efficiency.
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Affiliation(s)
- Linh N Luong
- Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109-2110, USA
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Biomimetic organic-inorganic nanocomposite coatings for titanium implants. J Biomed Mater Res A 2009; 89:759-71. [DOI: 10.1002/jbm.a.32021] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Dorozhkin SV. Calcium orthophosphate-based biocomposites and hybrid biomaterials. JOURNAL OF MATERIALS SCIENCE 2009; 44:2343-2387. [DOI: 10.1007/s10853-008-3124-x] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Accepted: 11/20/2008] [Indexed: 07/02/2024]
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Leonor I, Alves C, Azevedo H, Reis R. Effects of protein incorporation on calcium phosphate coating. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.08.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Yao CL, Xu WH, Ding AM, Zhu JM. Sucrose/bovine serum albumin mediated biomimetic crystallization of calcium carbonate. J CHEM SCI 2009. [DOI: 10.1007/s12039-009-0010-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Yu X, Qu H, Knecht DA, Wei M. Incorporation of bovine serum albumin into biomimetic coatings on titanium with high loading efficacy and its release behavior. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:287-294. [PMID: 18763021 DOI: 10.1007/s10856-008-3571-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Accepted: 08/18/2008] [Indexed: 05/26/2023]
Abstract
Bovine serum albumin (BSA) was employed as a model protein to study its loading efficiency into a calcium phosphate (CaP) coating on titanium substrates. It is found that the protein loading efficiency can be adjusted by varying the specific configurations of the coating system such as simulated body fluid (SBF) volume, solution height and container selection for the SBF. A BSA loading efficiency as high as 90% was achieved when the ratio of the substrate surface area to modified SBF (m-SBF) volume was as high as 0.072. The release of BSA from the biomimetic coatings was also investigated in vitro. A sustained release was achieved although a large quantity of BSA was still trapped in the coating after 15 days of immersion in a phosphate buffer solution. A much faster release rate would be expected when the coating is implanted in vivo due to the active involvement of osteoclast cells and enzymes.
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Affiliation(s)
- Xiaohua Yu
- Department of Chemical, University of Connecticut, U-3136, Storrs, CT 06269, USA
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Stenport V, Kjellin P, Andersson M, Currie F, Sul YT, Wennerberg A, Arvidsson A. Precipitation of calcium phosphate in the presence of albumin on titanium implants with four different possibly bioactive surface preparations. An in vitro study. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2008; 19:3497-3505. [PMID: 18622767 DOI: 10.1007/s10856-008-3517-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2007] [Accepted: 06/18/2008] [Indexed: 05/26/2023]
Abstract
The aim of the present study was to compare the nucleating behaviour on four types of bioactive surfaces by using the simulated body fluid (SBF) model with the presence albumin. Titanium discs were blasted (B) and then prepared by alkali and heat treatment (AH), anodic oxidation (AO), fluoridation (F), or hydroxyapatite coating (HA). The discs were immersed in SBF with 4.5 mg/ml albumin for 3 days, 1, 2, 3 and 4 weeks and analysed with scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX) and X-ray photoelectron spectroscopy (XPS). Topographic surface characterisation was performed with a contact stylus profilometer. The results demonstrated that the bioactive surfaces initiated an enhanced calcium phosphate (CaP) formation and a more rapid increase of protein content was present on the bioactive surfaces compared to the blasted control surface. The observation was present on all bioactive surfaces. The fact that there was a difference between the bioactive surfaces and the blasted control surface with respect to precipitation of CaP and protein content on the surfaces support the fact that there may be biochemical advantages in vivo by using a bioactive surface.
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Affiliation(s)
- V Stenport
- Department of Biomaterials, Göteborg University, P.O. Box 412, 405 30, Goteborg, Sweden.
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Järn M, Heikkilä M, Lindén M. Bioinspired synthesis of superhydrophobic coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10625-10628. [PMID: 18771300 DOI: 10.1021/la802160a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A superhydrophobic material prepared by precipitating calcium phosphate on TiO2 films under in vitro conditions is described. Crystalline calcium phosphate is very porous with octacalcium phosphate as the main phase. The films are made hydrophobic by the surface grafting of a perfluorophosphate surfactant (Zonyl FSE). The as-prepared coatings were strongly hydrophobic, with advancing contact angles exceeding 165 degrees and receding angles exceeding 150 degrees . The formation of the calcium phosphate layer is self-organizing, and the coating is easily functionalized. The material was characterized with dynamic contact angle measurements, SEM, XRD, and XPS. The strong water repellency is explained by the open porous morphology of the calcium phosphate coating together with the successful attachment of the hydrophobic function.
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Affiliation(s)
- Mikael Järn
- Center for Functional Materials, Department of Physical Chemistry, Abo Akademi University, Porthansgatan 3-5, FI-20500, Turku, Finland
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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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Self-assembled structures of hydroxyapatite in the biomimetic coating on a bioinert ceramic substrate. Colloids Surf B Biointerfaces 2008; 66:295-8. [DOI: 10.1016/j.colsurfb.2008.06.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2008] [Revised: 06/17/2008] [Accepted: 06/20/2008] [Indexed: 11/20/2022]
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Qu H, Wei M. The effect of temperature and initial pH on biomimetic apatite coating. J Biomed Mater Res B Appl Biomater 2008; 87:204-12. [DOI: 10.1002/jbm.b.31096] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Qu H, Wei M. Improvement of bonding strength between biomimetic apatite coating and substrate. J Biomed Mater Res B Appl Biomater 2008; 84:436-43. [PMID: 17621662 DOI: 10.1002/jbm.b.30889] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Bone-like apatite coatings were prepared using a biomimetic method in a modified simulated body fluid (m-SBF). The effect of the m-SBF volume on the apatite coating quality was studied. Three m-SBF volumes, 50, 100, and 200 mL, were employed to immerse titanium substrates in a sealed container so as to produce apatite coatings with different properties, namely types I, type II, and type III apatite coatings, respectively. The coatings were characterized using X-ray diffraction and environmental scanning electron microscope. The bonding between the coating and the Ti substrate was evaluated using an adhesive strength test. All three apatite coatings demonstrated a poorly crystallized structure, and the coatings formed exhibited a uniformed surface morphology. Further increasing the m-SBF volume, small globules of apatite started to form on the surface of the coating. The bonding strength for the three coating systems were 8.52 +/- 2.41, 10.36 +/- 2.78, and 17.23 +/- 2.55 MPa for types I, II, and III apatite coatings, respectively. The failure analyses suggested that type III coating failed mostly at the interface between the coating and the substrate, while type I and II coatings failed mostly within the apatite coating. Our study revealed that a dense, thick, well-adhered apatite coating could be achieved by carefully controlling the volume of m-SBF.
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Affiliation(s)
- Haibo Qu
- Materials Science and Engineering Program, Department of Chemical, Materials, and Biomolecular Engineering, University of Connecticut, 97 North Eagleville Road, U-3136, Storrs, Connecticut 06269, USA
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Segvich S, Smith HC, Luong LN, Kohn DH. Uniform deposition of protein incorporated mineral layer on three-dimensional porous polymer scaffolds. J Biomed Mater Res B Appl Biomater 2008; 84:340-9. [PMID: 17618505 PMCID: PMC2744812 DOI: 10.1002/jbm.b.30877] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Inorganic-organic hybrid materials designed to facilitate bone tissue regeneration use a calcium phosphate mineral layer to encourage cell adhesion, proliferation, and osteogenic differentiation. Mineral formed on porous materials is often discontinuous through the thickness of the scaffold. This study aimed to uniformly coat the pores of three-dimensional (3D) porous, polymer scaffolds with a bone-like mineral layer in addition to uniformly incorporating a model protein within this mineral layer. A filtration system designed to induce simulated body fluid flow through the interstices of 3D polylactic-co-glycolic acid scaffolds (10-mm diameter x 2-mm thickness) illustrated that a uniform, continuous mineral layer can be precipitated on the pore surfaces of a 3D porous structure within 5 days. MicroCT analysis showed increased mineral volume percent (MV%) (7.86 +/- 3.25 MV%, p = 0.029) and continuous mineralization of filtered scaffolds compared with two static control groups (floating, 0.16 +/- 0.26 MV% and submerged, 0.20 +/- 0.01 MV%). Furthermore, the system was effective in coprecipitating a model protein, bone sialoprotein (BSA), within the mineral layer. A 10-fold increase in BSA incorporation was seen when coprecipitated filtered scaffolds (1308 +/- 464 microg) were compared to a submerged static control group (139 +/- 45 microg), p < 0.001. Confocal microscopy visually confirmed uniform coprecipitation of BSA throughout the thickness of the filtration scaffolds. The designed system enables 3D mineralization through the thickness of porous materials, and provides the option of including coprecipitated biomolecular cues within the mineral layer. This approach of providing a 3D conductive and osteoinductive environment could be conducive to bone tissue regeneration.
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Affiliation(s)
- Sharon Segvich
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA
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Calcium phosphate composite materials including inorganic powders, BSA or duplex DNA prepared by W/O/W interfacial reaction method. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.01.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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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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Silicon-substituted hydroxyapatite: The next generation of bioactive coatings. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2007. [DOI: 10.1016/j.msec.2006.05.016] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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