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Saito MM, Onuma K, Yamakoshi Y. Cementum is key to periodontal tissue regeneration: A review on apatite microstructures for creation of novel cementum-based dental implants. Genesis 2023; 61:e23514. [PMID: 37067171 DOI: 10.1002/dvg.23514] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 01/16/2023] [Accepted: 02/05/2023] [Indexed: 04/18/2023]
Abstract
The cementum is the outermost layer of hard tissue covering the dentin within the root portion of the teeth. It is the only hard tissue with a specialized structure and function that forms a part of both the teeth and periodontal tissue. As such, cementum is believed to be critical for periodontal tissue regeneration. In this review, we discuss the function and histological structure of the cementum to promote crystal engineering with a biochemical approach in cementum regenerative medicine. We review the microstructure of enamel and bone while discussing the mechanism underlying apatite crystal formation to infer the morphology of cementum apatite crystals and their complex structure with collagen fibers. Finally, the limitations of the current dental implant treatments in clinical practice are explored from the perspective of periodontal tissue regeneration. We anticipate the possibility of advancing periodontal tissue regenerative medicine via cementum regeneration using a combination of material science and biochemical methods.
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Affiliation(s)
- Mari M Saito
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Kazuo Onuma
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Yasuo Yamakoshi
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, Yokohama, Japan
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2
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Calcium Phosphate-Based Biomaterials for Bone Repair. J Funct Biomater 2022; 13:jfb13040187. [PMID: 36278657 PMCID: PMC9589993 DOI: 10.3390/jfb13040187] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/03/2022] [Accepted: 10/10/2022] [Indexed: 11/07/2022] Open
Abstract
Traumatic, tumoral, and infectious bone defects are common in clinics, and create a big burden on patient's families and society. Calcium phosphate (CaP)-based biomaterials have superior properties and have been widely used for bone defect repair, due to their similarities to the inorganic components of human bones. The biological performance of CaPs, as a determining factor for their applications, are dependent on their physicochemical properties. Hydroxyapatite (HAP) as the most thermally stable crystalline phase of CaP is mostly used in the form of ceramics or composites scaffolds with polymers. Nanostructured CaPs with large surface areas are suitable for drug/gene delivery systems. Additionally, CaP scaffolds with hierarchical nano-/microstructures have demonstrated excellent ability in promoting bone regeneration. This review focuses on the relationships and interactions between the physicochemical/biological properties of CaP biomaterials and their species, sizes, and morphologies in bone regeneration, including synthesis strategies, structure control, biological behavior, and the mechanisms of CaP in promoting osteogenesis. This review will be helpful for scientists and engineers to further understand CaP-based biomaterials (CaPs), and be useful in developing new high-performance biomaterials for bone repair.
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3
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Sugiura Y, Yamada E, Horie M. Fabrication of octacalcium phosphate block through the reaction between CaCO 3 powder and phosphate acid. CHEM LETT 2022. [DOI: 10.1246/cl.220238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuki Sugiura
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu, Kagawa 761-3095
| | - Etsuko Yamada
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu, Kagawa 761-3095
| | - Masanori Horie
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu, Kagawa 761-3095
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4
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Sugiura Y, Horie M. Fabrication of interconnected porous Ag substituted octacalcium phosphate blocks based on a dissolution-precipitation reaction. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2022; 33:48. [PMID: 35639182 PMCID: PMC9156480 DOI: 10.1007/s10856-022-06672-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
Here, we introduce Ag substituted octacalcium phosphate (OCP-Ag) blocks with interconnected porous structure and sufficient mechanical strength as bone substitute (i.e., foam). We employed a two-step process for fabrication, which includes a setting reaction for acidic calcium phosphate granules using an acidic phosphate solution and a phase conversion process via dissolution-precipitation method in cocktail ((NH4)2HPO4-NH4NO3-NaNO3-AgNO3) solutions. The Ag contents in the fabricated OCP-Ag foams were 0.08-0.15 at%, which were sufficient in exhibiting contact antibacterial ability. The mechanical strength and porosity of the OCP-Ag foams were about 0.5 MPa and 70%, respectively. These values were sufficient for the application of the OCP-Ag foams as bone substitute. Graphical abstract.
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Affiliation(s)
- Yuki Sugiura
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14 Hayashi-cho, Takamatsu, Kagawa, 761-0395, Japan.
| | - Masanori Horie
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14 Hayashi-cho, Takamatsu, Kagawa, 761-0395, Japan
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5
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Okuyama K, Shiwaku Y, Hamai R, Mizoguchi T, Tsuchiya K, Takahashi T, Suzuki O. Differentiation of committed osteoblast progenitors by octacalcium phosphate compared to calcium-deficient hydroxyapatite in Lepr-cre/Tomato mouse tibia. Acta Biomater 2022; 142:332-344. [PMID: 35183778 DOI: 10.1016/j.actbio.2022.02.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/24/2022] [Accepted: 02/14/2022] [Indexed: 12/23/2022]
Abstract
This study aimed to investigate the accumulation and differentiation of mesenchymal stem cells (MSCs) around octacalcium phosphate (OCP) compared with those around calcium-deficient hydroxyapatite (CDHA), a material obtained through hydrolysis of the original OCP. Leptin receptor (Lepr)-expressing bone marrow-derived MSCs around the OCP and CDHA were pursued utilizing genetically modified Lepr-cre/Tomato mice. OCP and CDHA granules were implanted into the tibia defect of the mice for 10 weeks and subjected to histomorphometric and immunohistochemical analyses. The structural properties of OCP and CDHA after inoculation into mouse subcutaneous tissue (until 4 weeks) or culture mediums (14 days) were analyzed using physicochemical techniques. In vitro osteoblastic differentiation of primary MSCs was examined with the materials for 14 days. While Lepr-cre/Tomato positive cells (red) accumulated around both OCP and CDHA, Lepr and osteocalcin double-positive osteoblastic cells (yellow) were significantly more abundant around OCP than around CDHA in the early implantation period. OCP enhanced the osteoblastic differentiation of MSCs more than CDHA in vitro. Physicochemical and structual analyses provided evidence that OCP tended to convert to the apatitic phase in the tested physiological environments. The higher osteoconductivity of OCP originated from a capacity-enhancing osteoblastic differentiation of committed osteoblast progenitors in bone marrow accompanied by OCP hydrolysis. STATEMENT OF SIGNIFICANCE: MSCs play a key role in bone regeneration through osteoblastic differentiation. Calcium phosphates have been widely applied as bone substitute materials, and OCP has a better ability to promote osteoblast differentiation of MSCs than that of HA in vitro. However, it is not clear how MSCs accumulate in the bone marrow and differentiate into osteoblasts during bone regeneration in vivo. In this study, we focused on the leptin receptor, a marker of bone marrow-derived MSCs. Using genetically modified mice labeled with the red fluorescent protein Tomato, we observed the accumulation of MSCs around calcium phosphates implanted in tibia bone defects and their differentiation into osteoblasts.
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Affiliation(s)
- Kyosuke Okuyama
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan; Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - Yukari Shiwaku
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan; Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - 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
| | - Tetsu Takahashi
- Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, 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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6
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Koyama S, Hamai R, Shiwaku Y, Kurobane T, Tsuchiya K, Takahashi T, Suzuki O. Angio-osteogenic capacity of octacalcium phosphate co-precipitated with copper gluconate in rat calvaria critical-sized defect. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2022; 23:120-139. [PMID: 35185389 PMCID: PMC8856029 DOI: 10.1080/14686996.2022.2035193] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 01/20/2022] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
The objective of this study is to investigate the effects of octacalcium phosphate (OCP)-induced bone regeneration on angiogenesis regulated by the inclusion of copper ions in OCP in vitro and in vivo. Calcium (Ca)-deficient Cu-OCPs, containing 0.01 wt% Cu (low-Cu-OCP) and 0.12 wt% Cu (high-Cu-OCP), were synthesized with co7pper gluconate salt. The lattice parameters of Cu-OCPs tended to decrease slightly with Cu inclusion, as estimated by Rietveld analysis. Cu ions were released in OCP when the materials were incubated in the medium for human umbilical vein endothelial cells (HUVECs). The solubility of Cu-OCPs, estimated by the degree of supersaturation, was slightly higher than that of the original OCP. Cu-OCP tended to hydrolyze to an apatite structure while maintaining the crystal plate-like morphology when incubated with mesenchymal stem D1 cells in osteogenic media for 14 days. The specimens were characterized by selected area electron diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. Low-Cu-OCP significantly enhanced the HUVEC capillary cross-linking density. D1 cell differentiation was inhibited with the inclusion of Cu, even at low concentrations. The composite of low-Cu-OCP with a gelatin sponge (low-Cu-OCP/Gel) significantly enhanced angiogenesis coupled with bone regeneration when implanted in a rat calvarial critical-sized defect for 4 weeks, compared with the corresponding amount of Cu-containing Gel (Cu/Gel) or OCP/Gel materials through angiography and tissue histomorphometry. These results support the proposition that angiogenesis stimulated by low-Cu-OCP is closely related with enhanced bone regeneration.
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Affiliation(s)
- Shinki Koyama
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, Sendai, Japan
- Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Ryo Hamai
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Yukari Shiwaku
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, Sendai, Japan
- Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Tsuyoshi Kurobane
- Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Kaori Tsuchiya
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Tetsu Takahashi
- Division of Oral and Maxillofacial Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Osamu Suzuki
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, Sendai, Japan
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7
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Kovrlija I, Locs J, Loca D. Octacalcium phosphate: Innovative vehicle for the local biologically active substance delivery in bone regeneration. Acta Biomater 2021; 135:27-47. [PMID: 34450339 DOI: 10.1016/j.actbio.2021.08.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 08/09/2021] [Accepted: 08/14/2021] [Indexed: 12/29/2022]
Abstract
Disadvantages of conventional drug delivery systems (DDS), such as systemic circulation, interaction with physiochemical factors, reduced bioavailability, and insufficient drug concentration at bone defect site, have underlined the importance of developing efficacious local drug delivery systems. Octacalcium phosphate (OCP) is presumed to be the precursor of biologically formed apatite, owing to its similarity to hydroxyapatite (HAp) and readiness to convert to it. Specific crystal structure of OCP is constructed of compiled apatite layers and water layers, which make possible the incorporation of various ions in its structure, making it feasible to alter the overall effect OCP has in the system. Next to that intrinsic property, characteristics as high solubility, biodegradability and osteoconductivity have made it indispensable to tailor OCP as a carrier material. In this review, we present the main characteristics and progress done on utilizing OCP as an innovative vehicle and provide suggestions for possible research pathways and advantages for local drug delivery in bone tissue engineering. STATEMENT OF SIGNIFICANCE: Octacalcium phosphate (OCP), being a precursor to biologically formed apatite, has many assets when compared to other calcium phosphates. Owing to its highly pertinent structure, it is being used as a vehicle for biologically active substances or ions for bone regeneration. However, orchestrating drug delivery systems with OCP, in order to achieve the best possible outcome, is still a pioneering concept, and the all-encompassing data is still scarce. Although several articles have been published on this matter, to this date there is no systematic overview pointing out the benefits that OCP can bring in the field of drug delivery. Here we offer a comprehensive overview, starting from the OCP synthesis to its structure, morphology, and the biological significance OCP has.
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8
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Petrakova NV, Teterina AY, Mikheeva PV, Akhmedova SA, Kuvshinova EA, Sviridova IK, Sergeeva NS, Smirnov IV, Fedotov AY, Kargin YF, Barinov SM, Komlev VS. In Vitro Study of Octacalcium Phosphate Behavior in Different Model Solutions. ACS OMEGA 2021; 6:7487-7498. [PMID: 33778261 PMCID: PMC7992079 DOI: 10.1021/acsomega.0c06016] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 01/26/2021] [Indexed: 06/12/2023]
Abstract
Octacalcium phosphate (OCP), a new-generation bone substitute material, is a considered precursor of the biological bone apatite. The two-layered structure of OCP contains the apatitic and hydrated layers and is intensively involved in ion-exchange surface reactions, which results in OCP hydrolysis to hydroxyapatite and adsorption of ions or molecular groups presented in the environment. During various in vitro procedures, such as biomaterial solubility, additive release studies, or the functionalization technique, several model solutions are applied. The composition of the environmental solution affects the degree and rate of OCP hydrolysis, its surface reactivity, and further in vitro and in vivo properties. The performed study was aimed to track the structural changes of OCP-based materials while treating in the most popular model solutions of pH values 7.2-7.4: simulated body fluid (SBF), Dulbecco's phosphate-buffered saline (DPBS), supersaturated calcification solution (SCS), normal saline (NS), and Dulbecco's modified Eagle's medium (DMEM). Various degrees of OCP hydrolysis and/or precipitate formation were achieved through soaking initial OCP granules in the model solutions. Detailed data of X-ray diffraction, Fourier-transform infrared spectroscopy, atomic emission spectrometry with inductively coupled plasma, and scanning electron microscopy are presented. Cultivation of osteosarcoma cells was implemented on OCP pre-treated in DMEM for 1-28 days. It was shown that NS mostly degraded the OCP structure. DPBS slightly changed the OCP structure during the first treatment term, and during further terms, the crystals got thinner and OCP hydrolysis took place. Treatment in SBF and SCS caused the precipitate formation along with OCP hydrolysis, with a larger contribution of SCS solution to precipitation. Pre-treating in DMEM enhanced the cytocompatibility of materials. As a result, on performing the in vitro procedures, careful selection of the contact solution should be made to avoid the changes in materials structure and properties and get adequate results.
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Affiliation(s)
- Nataliya V. Petrakova
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Anastasia Yu. Teterina
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Polina V. Mikheeva
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Suraya A. Akhmedova
- Forecast
Lab, P.A. Herzen Moscow Research Oncology
Institute−Branch of FSBI NMRRC of the Ministry of Health of
Russia, The 2-nd Botkinskiy
pr, 3, Moscow 125284, Russia
| | - Ekaterina A. Kuvshinova
- Forecast
Lab, P.A. Herzen Moscow Research Oncology
Institute−Branch of FSBI NMRRC of the Ministry of Health of
Russia, The 2-nd Botkinskiy
pr, 3, Moscow 125284, Russia
| | - Irina K. Sviridova
- Forecast
Lab, P.A. Herzen Moscow Research Oncology
Institute−Branch of FSBI NMRRC of the Ministry of Health of
Russia, The 2-nd Botkinskiy
pr, 3, Moscow 125284, Russia
| | - Natalya S. Sergeeva
- Forecast
Lab, P.A. Herzen Moscow Research Oncology
Institute−Branch of FSBI NMRRC of the Ministry of Health of
Russia, The 2-nd Botkinskiy
pr, 3, Moscow 125284, Russia
| | - Igor V. Smirnov
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Alexander Yu. Fedotov
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Yuriy F. Kargin
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Sergey M. Barinov
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
| | - Vladimir S. Komlev
- Ceramic
Composite Materials, A.A. Baikov Institute
of Metallurgy and Materials Science RAS, Leninskiy Prospect 49, Moscow 119334, Russia
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9
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Sugiura Y, Niitsu K, Saito Y, Endo T, Horie M. Inorganic process for wet silica-doping of calcium phosphate. RSC Adv 2021; 11:12330-12335. [PMID: 35423780 PMCID: PMC8696845 DOI: 10.1039/d1ra00288k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/24/2021] [Indexed: 11/21/2022] Open
Abstract
Silica is not only a biocompatible trace element but also an essential element for bone formation and metabolism. Therefore, it is often doped into bioceramics such as calcium phosphate and calcium carbonate for enhancing biomaterial ability. Heretofore, organic silica materials are employed as silica sources, but the residual organic matter is a significant drawback in biomaterial applications. Therefore, in this study, we introduce a one-pot inorganic synthesis method for the formation of silica-doped octacalcium phosphate (OCP) using Na2SiO3 as the silica source. Silica was intercalated into the OCP unit lattice, replacing its hydrous layer structure, and then a layer-by-layer structure of apatite and silica was formed. Furthermore, by immersing the fabricated silica-doped OCP into suitable solutions, both silica-doped hydroxyapatite and carbonate apatite were fabricated through a one-step inorganic processes. We introduced a one-pot synthesis method for silica doping of calcium phosphate. Silica easily incorporated into OCP interlayer optimizing Na2SiO3 concentrations.![]()
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Affiliation(s)
- Yuki Sugiura
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Kagawa 761-0395 Japan
| | - Kodai Niitsu
- Department of Material Science and Engineering, Kyoto University Kyoto 606-8501 Japan
| | - Yasuko Saito
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST) Hiroshima 739-0046 Japan
| | - Takashi Endo
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST) Hiroshima 739-0046 Japan
| | - Masanori Horie
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Kagawa 761-0395 Japan
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10
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Sugiura Y, Obika H, Horie M, Niitsu K, Makita Y. Aesthetic Silver-Doped Octacalcium Phosphate Powders Exhibiting Both Contact Antibacterial Ability and Low Cytotoxicity. ACS OMEGA 2020; 5:24434-24444. [PMID: 33015459 PMCID: PMC7528307 DOI: 10.1021/acsomega.0c02868] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/19/2020] [Indexed: 05/11/2023]
Abstract
Since the introduction of biomaterials, infection has been a serious problem in clinical operations. Although several studies have introduced hybrid materials of calcium phosphate and Ag0 nanoparticles (NPs) that exhibit antibacterial activity, released Ag+ ions and Ag0 NPs are highly cytotoxic and the materials require complex fabrication techniques such as laser irradiation. In this study, we introduce a simple one-pot synthesis method based on crystal-engineering techniques to prepare Ag+-substituted octacalcium phosphate (OCP-Ag) powder that simultaneously exhibits antibacterial activity, little change in color, and low cytotoxicity, thereby overcoming the shortcomings of calcium phosphate as a biomaterial. We used AgNO3-containing (NH4)2HPO4 aqueous solutions as reaction solutions in which Ag+ forms soluble complex [Ag(NH3)2]+ ions that are stable at Ag+ concentrations less than ∼30 mmol/L. Hydrolysis of soluble calcium phosphate in this solution led to pure OCP-Ag when the Ag+ concentration was less than ∼30 mmol/L. Crystallographic analysis showed that Ag+ substituted at the P5 PO4-conjugated sites and was uniformly distributed. When the concentration of Ag+ in the reaction solution was varied, the Ag+ content of the OCP-Ag could be controlled. The obtained OCP-Ag exhibited little color change or Ag+ release when immersed in various media; however, it exhibited contact antibacterial ability toward resident oral bacteria. The prepared OCP-Ag showed no substantial cytotoxicity toward undifferentiated and differentiated MC3T3-E1 cells in assays. Notably, when the Ag+ content in OCP-Ag was optimized (Ag: ∼1 at %), it simultaneously exhibited contact antibacterial ability, little color change, and low cytotoxicity.
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Affiliation(s)
- Yuki Sugiura
- Health
and Medical Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu 761-0895, Kagawa, Japan
| | - Hideki Obika
- Health
and Medical Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu 761-0895, Kagawa, Japan
| | - Masanori Horie
- Health
and Medical Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu 761-0895, Kagawa, Japan
| | - Kodai Niitsu
- Department
of Material Science and Engineering, Kyoto
University, Yoshida-honcho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yoji Makita
- Health
and Medical Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 2217-14, Hayashi-cho, Takamatsu 761-0895, Kagawa, Japan
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11
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Suzuki O, Shiwaku Y, Hamai R. Octacalcium phosphate bone substitute materials: Comparison between properties of biomaterials and other calcium phosphate materials. Dent Mater J 2020; 39:187-199. [PMID: 32161239 DOI: 10.4012/dmj.2020-001] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Octacalcium phosphate (OCP) is a material that can be converted to hydroxyapatite (HA) under physiological environments and is considered a mineral precursor to bone apatite crystals. The structure of OCP consists of apatite layers stacked alternately with hydrated layers, and closely resembles the structure of HA. The performance of OCP as a bone substitute differs from that of HA materials in terms of their osteoconductivity and biodegradability. OCP manifests a cellular phagocytic response through osteoclast-like cells similar to that exhibited by the biodegradable material β-tricalcium phosphate (β-TCP). The use of OCP for human cranial bone defects involves using its granule or composite form with one of the natural polymers, viz., the reconstituted collagen. This review article discusses the differences and similarities in these calcium phosphate (Ca-P)-based materials from the viewpoint of the structure and their material chemistry, and attempts to elucidate why Ca-P materials, particularly OCP, display unique osteoconductive property.
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Affiliation(s)
- Osamu Suzuki
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry
| | - Yukari Shiwaku
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry
| | - Ryo Hamai
- Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry
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12
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Sugiura Y, Makita Y. Tris(hydroxymethyl)aminomethane Substitution into Octacalcium Phosphate. CHEM LETT 2019. [DOI: 10.1246/cl.190553] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuki Sugiura
- Health Research Institute, National Institute of Advanced Industrial Science and Technology, 2217-14 Hayashi-cho, Takamatsu, Kagawa 761-0395, Japan
| | - Yoji Makita
- Health Research Institute, National Institute of Advanced Industrial Science and Technology, 2217-14 Hayashi-cho, Takamatsu, Kagawa 761-0395, Japan
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13
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Sugiura Y, Makita Y. Ammonium inhibition of the intercalation of dicarboxylic acid molecules into octacalcium phosphate layer by substitution. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120923] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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14
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Angiogenesis involvement by octacalcium phosphate-gelatin composite-driven bone regeneration in rat calvaria critical-sized defect. Acta Biomater 2019; 88:514-526. [PMID: 30776505 DOI: 10.1016/j.actbio.2019.02.021] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 01/26/2019] [Accepted: 02/14/2019] [Indexed: 12/29/2022]
Abstract
Effect of octacalcium phosphate/gelatin composite (OCP/Gel) on angiogenesis was studied by its implantation in rat calvaria critical-sized defect in relation to bone regeneration for 2 and 4 weeks. The implantation of OCP/Gel disks was analyzed by radiomorphometry using a radiopaque material perfusion (Microfil®) method and histomorphometry by hematoxylin and eosin-staining before and after the decalcification. Effect of the OCP dose in the range up to 4 mg per well on the capillary-like tube formation by human umbilical vein endothelial cells (HUVECs) was also examined in a transwell cell culture. The results showed that the blood vessels formation by OCP/Gel group was significantly higher at 2 weeks than other groups but decreased at 4 weeks during the advancement of new bone formation. The capillary-like tube formation was highest in an OCP dose of 1 mg per well while other OCP doses above or below 1 mg did not show such a stimulatory effect. The results established both in vivo and in vitro confirmed that OCP has a positive effect on angiogenesis during bone regeneration in a suitable dose ranges, suggesting that the angiogenesis stimulated by OCP could be involved in the OCP/Gel-enhanced bone regeneration. STATEMENT OF SIGNIFICANCE: We have reported that octacalcium phosphate (OCP) materials display stimulatory capacities on the bone tissue-related cells. However, the effect of OCP on the angiogenesis and its relation to the OCP-enhanced bone regeneration is unknown. This study confirmed the capacity of OCP on angiogenesis before increasing the new bone mass after the implantation of a composite of OCP and gelatin (OCP/Gel). The blood vessels formation took place associated with the area beginning of the new bone formation, which finally decreased together with development of bone formation. Because OCP was ascertained stimulating the capillary-like tube formation in HUVEC culture with a certain OCP dose, the present study is the first report showing the capacity of OCP on angiogenesis during the OCP/Gel-enhanced bone regeneration.
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Fabrication of carbonate apatite blocks from octacalcium phosphate blocks through different phase conversion mode depending on carbonate concentration. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.08.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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