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Zujovic Z, Bowmaker GA. On the Structure and Role of Avian Eggshells: A 31P, 1H, and 13C Solid-State NMR Study. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:15523-15529. [PMID: 38963614 DOI: 10.1021/acs.jafc.4c01365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/05/2024]
Abstract
The eggshell is a composite and highly ordered structure formed by biomineralization. Besides other functions, it has a vital and intricate role in the protection of an embryo from various potentially harsh environmental conditions. Solid-state nuclear magnetic resonance (SSNMR) has been used for detailed structural investigations of the chicken, tinamou, and flamingo eggshell materials. 31P NMR spectra reveal that hydroxyapatite and β-tricalcium phosphate in the ratio 3:2 represent major constituents of phosphate species in the eggshells. All three eggshells exhibit similar spectra, except for the line widths, which implies different structural order of phosphate species in the chicken, tinamou, and flamingo eggshells. 1H NMR spectra for these materials are comparable, differentiating overlapped peaks in three spectral regions at around 7, 4-5, and 1-2 ppm. These spectral regions have been attributed to protons from NH or CaHCO3, water, and possibly isolated monomeric water molecules or hydroxyl groups in calcium-deficient hydroxyapatite. 1H-13C CP MAS NMR revealed the presence of organic matter in the form of lipids and proteins. Two overlapped resonances in the carbonyl region at around 173 and 169 ppm are assigned to the carbonyls of the peptide bonds and the bicarbonate unit in calcite, respectively. Fourier-transform infrared spectroscopy (FTIR) spectra confirmed the presence of structural units detected in the NMR spectra.
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Affiliation(s)
- Zoran Zujovic
- Institute of General and Physical Chemistry, Studentski Trg 12/5, 1100 Belgrade, Republic of Serbia
- School of Chemical Sciences, Faculty of Science, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Graham A Bowmaker
- School of Chemical Sciences, Faculty of Science, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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2
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Bonetti L, Borsacchi S, Soriente A, Boccali A, Calucci L, Raucci MG, Altomare L. Injectable in situ gelling methylcellulose-based hydrogels for bone tissue regeneration. J Mater Chem B 2024; 12:4427-4440. [PMID: 38629219 DOI: 10.1039/d3tb02414h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024]
Abstract
Injectable bone substitutes (IBSs) represent a compelling choice for bone tissue regeneration, as they can be exploited to optimally fill complex bone defects in a minimally invasive manner. In this context, in situ gelling methylcellulose (MC) hydrogels may be engineered to be free-flowing injectable solutions at room temperature and gels upon exposure to body temperature. Moreover, incorporating a suitable inorganic phase can further enhance the mechanical properties of MC hydrogels and promote mineralization, thus assisting early cell adhesion to the hydrogel and effectively guiding bone tissue regeneration. In this work, thermo-responsive IBSs were designed selecting MC as the organic matrix and calcium phosphate (CaP) or CaP modified with graphene oxide (CaPGO) as the inorganic component. The resulting biocomposites displayed a transition temperature around body temperature, preserved injectability even after loading with the inorganic components, and exhibited adequate retention on an ex vivo calf femoral bone defect model. The addition of CaP and CaPGO promoted the in vitro mineralization process already 14 days after immersion in simulated body fluid. Interestingly, combined X-ray diffraction and solid state nuclear magnetic resonance characterizations revealed that the formed biomimetic phase was constituted by crystalline hydroxyapatite and amorphous calcium phosphate. In vitro biological characterization revealed the beneficial impact of CaP and CaPGO, indicating their potential in promoting cell adhesion, proliferation and osteogenic differentiation. Remarkably, the addition of GO, which is very attractive for its bioactive properties, did not negatively affect the injectability of the hydrogel nor the mineralization process, but had a positive impact on cell growth and osteogenic differentiation on both pre-differentiated and undifferentiated cells. Overall, the proposed formulations represent potential candidates for use as IBSs for application in bone regeneration both under physiological and pathological conditions.
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Affiliation(s)
- Lorenzo Bonetti
- Department of Chemistry, Materials, and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
| | - Silvia Borsacchi
- Institute of Chemistry of Organometallic Compounds (ICCOM), Italian National Research Council (CNR), Via G. Moruzzi 1, 56124 Pisa, Italy.
- Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Alessandra Soriente
- Institute for Polymers, Composites and Biomaterials (IPCB), Italian National Research Council, Viale J.F. Kennedy 54, Mostra d'Oltremare Pad 20, 80125 Napoli, Italy
| | - Alberto Boccali
- Department of Chemistry, Materials, and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
| | - Lucia Calucci
- Institute of Chemistry of Organometallic Compounds (ICCOM), Italian National Research Council (CNR), Via G. Moruzzi 1, 56124 Pisa, Italy.
- Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Maria Grazia Raucci
- Institute for Polymers, Composites and Biomaterials (IPCB), Italian National Research Council, Viale J.F. Kennedy 54, Mostra d'Oltremare Pad 20, 80125 Napoli, Italy
| | - Lina Altomare
- Department of Chemistry, Materials, and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
- National Interuniversity Consortium for Materials Science and Technology (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
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Dhayal SK, Lund M, van den Brink J, Medjahdi G, Celzard A, Fierro V, Gardiennet C, Pasc A, Canilho N. Enhancing the activity of biocatalysts supported on calcium phosphate by inducing mesoporosity with phosphopeptides. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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4
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Achievements in Mesoporous Bioactive Glasses for Biomedical Applications. Pharmaceutics 2022; 14:pharmaceutics14122636. [PMID: 36559130 PMCID: PMC9782017 DOI: 10.3390/pharmaceutics14122636] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/22/2022] [Accepted: 11/25/2022] [Indexed: 11/30/2022] Open
Abstract
Nowadays, mesoporous bioactive glasses (MBGs) are envisaged as promising candidates in the field of bioceramics for bone tissue regeneration. This is ascribed to their singular chemical composition, structural and textural properties and easy-to-functionalize surface, giving rise to accelerated bioactive responses and capacity for local drug delivery. Since their discovery at the beginning of the 21st century, pioneering research efforts focused on the design and fabrication of MBGs with optimal compositional, textural and structural properties to elicit superior bioactive behavior. The current trends conceive MBGs as multitherapy systems for the treatment of bone-related pathologies, emphasizing the need of fine-tuning surface functionalization. Herein, we focus on the recent developments in MBGs for biomedical applications. First, the role of MBGs in the design and fabrication of three-dimensional scaffolds that fulfil the highly demanding requirements for bone tissue engineering is outlined. The different approaches for developing multifunctional MBGs are overviewed, including the incorporation of therapeutic ions in the glass composition and the surface functionalization with zwitterionic moieties to prevent bacterial adhesion. The bourgeoning scientific literature on MBGs as local delivery systems of diverse therapeutic cargoes (osteogenic/antiosteoporotic, angiogenic, antibacterial, anti-inflammatory and antitumor agents) is addressed. Finally, the current challenges and future directions for the clinical translation of MBGs are discussed.
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Aubry C, Drouet C, Azaïs T, Kim HJ, Oh JM, Karacan I, Chou J, Ben-Nissan B, Camy S, Cazalbou S. Bio-Activation of HA/β-TCP Porous Scaffolds by High-Pressure CO 2 Surface Remodeling: A Novel "Coating-from" Approach. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7306. [PMID: 36295371 PMCID: PMC9610974 DOI: 10.3390/ma15207306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/07/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Biphasic macroporous Hydroxyapatite/β-Tricalcium Phosphate (HA/β-TCP) scaffolds (BCPs) are widely used for bone repair. However, the high-temperature HA and β-TCP phases exhibit limited bioactivity (low solubility of HA, restricted surface area, low ion release). Strategies were developed to coat such BCPs with biomimetic apatite to enhance bioactivity. However, this can be associated with poor adhesion, and metastable solutions may prove difficult to handle at the industrial scale. Alternative strategies are thus desirable to generate a highly bioactive surface on commercial BCPs. In this work, we developed an innovative "coating from" approach for BCP surface remodeling via hydrothermal treatment under supercritical CO2, used as a reversible pH modifier and with industrial scalability. Based on a set of complementary tools including FEG-SEM, solid state NMR and ion exchange tests, we demonstrate the remodeling of macroporous BCP surface with the occurrence of dissolution-reprecipitation phenomena involving biomimetic CaP phases. The newly precipitated compounds are identified as bone-like nanocrystalline apatite and octacalcium phosphate (OCP), both known for their high bioactivity character, favoring bone healing. We also explored the effects of key process parameters, and showed the possibility to dope the remodeled BCPs with antibacterial Cu2+ ions to convey additional functionality to the scaffolds, which was confirmed by in vitro tests. This new process could enhance the bioactivity of commercial BCP scaffolds via a simple and biocompatible approach.
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Affiliation(s)
- Clémentine Aubry
- Centre Inter-Universitaire de Recherche et d’Ingénierie des Matériaux, CNRS/UT3/INP, Université de Toulouse, 31030 Toulouse, France
- Laboratoire de Génie Chimique, CNRS/UT3/INP, Université de Toulouse, 31030 Toulouse, France
- ARN: Régulation Naturelle et Artificielle, INSERM U1212, CNRS, Université de Bordeaux, 33076 Bordeaux, France
| | - Christophe Drouet
- Centre Inter-Universitaire de Recherche et d’Ingénierie des Matériaux, CNRS/UT3/INP, Université de Toulouse, 31030 Toulouse, France
| | - Thierry Azaïs
- Laboratoire de Chimie de la Matière Condensée de Paris-UMR 7574, CNRS, Sorbonne Université, 75005 Paris, France
| | - Hyoung-Jun Kim
- Department Energy and Materials Engineering, Dongguk University, Seoul 04620, Korea
- Research Institute, National Cancer Center, Goyang 10408, Korea
| | - Jae-Min Oh
- Department Energy and Materials Engineering, Dongguk University, Seoul 04620, Korea
| | - Ipek Karacan
- University of Technology Sydney, Ultimo 2007, Australia
| | - Joshua Chou
- University of Technology Sydney, Ultimo 2007, Australia
| | | | - Séverine Camy
- Laboratoire de Génie Chimique, CNRS/UT3/INP, Université de Toulouse, 31030 Toulouse, France
| | - Sophie Cazalbou
- Centre Inter-Universitaire de Recherche et d’Ingénierie des Matériaux, CNRS/UT3/INP, Université de Toulouse, 31030 Toulouse, France
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Sakhno Y, Miletto I, Paul G, Jaisi DP. A novel route to enhance the dissolution of apatite: Structural incorporation of hydrogen phosphate. NANOIMPACT 2022; 28:100422. [PMID: 36041682 DOI: 10.1016/j.impact.2022.100422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 08/20/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Potential use of hydroxyapatite nanoparticles (HANPs) [Ca10(PO4)6(OH)2] as slow P-release fertilizer (SRF) has recently attracted wider attention. However, commercially available HANP (with Ca/P ratio = 1.667) is the least soluble calcium phosphate and thus limits its full potential as an SRF in agronomic applications. In this research, we sought to enhance the dissolution rate of HANPs by enriching hydrogen phosphate (HPO42-) species in the phosphate (PO43-) structural sites. Seven different types of pure crystalline HANPs were synthesized at a range of Ca/P ratio from 1.46 (at pH 6.0) to 2.10 (at pH 12.0). Complementary results from FTIR and solid-state 31P MAS NMR spectroscopies showed that HPO42- species is most abundant in HANPs crystallized at pH 6.0 and gradually depleted at higher pH products. The rate of depletion of HPO42- species is proportional to the increase in carbonate incorporation into the HANP lattice, which preferentially forms B-type carbonated HANPs. The enhanced dissolution rate of HANPs due to hydrogen phosphate incorporation was tested using a flow-through macro-dialysis system that limits the partial transition of HANPs to other solid phases, which otherwise interfere with dissolution. The results show that the dissolution rate of HANPs increased with decreasing pH of synthesis and was highest in HANPs at pH 6.0. The dissolution rate differed by ten times between HANPs synthesized at pH 7.0 and 10.0. Overall, the atom-efficient synthetic route developed and the ability to tune the dissolution rate of HANPs are significant steps forward in improving the P-release efficiency of a potent SRF and is expected to contribute to efforts toward enhancing agricultural sustainability.
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Affiliation(s)
- Yuriy Sakhno
- Interdisciplinary Science and Engineering Laboratory, University of Delaware, Newark, DE 19716, USA.
| | - Ivana Miletto
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy.
| | - Geo Paul
- Department of Science and Technological Innovation, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Deb P Jaisi
- Interdisciplinary Science and Engineering Laboratory, University of Delaware, Newark, DE 19716, USA.
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Klimavicius V, Maršalka A, Kizalaite A, Zarkov A, Kareiva A, Aidas K, Hirschinger J, Balevicius V. Step-by-step from amorphous phosphate to nano-structured calcium hydroxyapatite: monitoring by solid-state 1H and 31P NMR and spin dynamics. Phys Chem Chem Phys 2022; 24:18952-18965. [PMID: 35916288 DOI: 10.1039/d2cp02108k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solid-state 1H, 31P NMR spectra and cross-polarization (CP MAS) kinetics in the series of samples containing amorphous phosphate phase (AMP), composite of AMP + nano-structured calcium hydroxyapatite (nano-CaHA) and high-crystalline nano-CaHA were studied under moderate spinning rates (5-30 kHz). The combined analysis of the solid-state 1H and 31P NMR spectra provides the possibility to determine the hydration numbers of the components and the phase composition index. A broad set of spin dynamics models (isotropic/anisotropic, relaxing/non-relaxing, secular/semi-non-secular) was applied and fitted to the experimental CP MAS data. The anisotropic model with the angular averaging of dipolar coupling was applied for AMP and nano-CaHA for the first time. It was deduced that the spin diffusion in AMP is close to isotropic, whereas it is highly anisotropic in nano-CaHA being close to the Ising-type. This can be caused by the different number of internuclear interactions that must be explicitly considered in the spin system for AMP (I-S spin pair) and nano-CaHA (IN-S spin system with N ≥ 2). The P-H distance in nano-CaHA was found to be significantly shorter than its crystallographic value. An underestimation can be caused by several factors, among those - proton conductivity via a large-amplitude motion of protons (O-H tumbling and the short-range diffusion) that occurs along OH- chains. The P-H distance deduced for AMP, i.e. the compound with HPO42- as the dominant structure, is fairly well matched to the crystallographic data. This means that the CP MAS kinetics is a capable technique to obtain complementary information on the proton localization in H-bonds and the proton transfer in the cases where traditional structure determination methods fail.
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Affiliation(s)
| | - Arūnas Maršalka
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania.
| | - Agne Kizalaite
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Aleksej Zarkov
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Aivaras Kareiva
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Kęstutis Aidas
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania.
| | - Jérôme Hirschinger
- Institut de Chimie, Université de Strasbourg, UMR 7177 CNRS, Strasbourg, France
| | - Vytautas Balevicius
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania.
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Mesoporous Bioglasses Enriched with Bioactive Agents for Bone Repair, with a Special Highlight of María Vallet-Regí’s Contribution. Pharmaceutics 2022; 14:pharmaceutics14010202. [PMID: 35057097 PMCID: PMC8778065 DOI: 10.3390/pharmaceutics14010202] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 01/05/2022] [Accepted: 01/13/2022] [Indexed: 02/04/2023] Open
Abstract
Throughout her impressive scientific career, Prof. María Vallet-Regí opened various research lines aimed at designing new bioceramics, including mesoporous bioactive glasses for bone tissue engineering applications. These bioactive glasses can be considered a spin-off of silica mesoporous materials because they are designed with a similar technical approach. Mesoporous glasses in addition to SiO2 contain significant amounts of other oxides, particularly CaO and P2O5 and therefore, they exhibit quite different properties and clinical applications than mesoporous silica compounds. Both materials exhibit ordered mesoporous structures with a very narrow pore size distribution that are achieved by using surfactants during their synthesis. The characteristics of mesoporous glasses made them suitable to be enriched with various osteogenic agents, namely inorganic ions and biopeptides as well as mesenchymal cells. In the present review, we summarize the evolution of mesoporous bioactive glasses research for bone repair, with a special highlight on the impact of Prof. María Vallet-Regí´s contribution to the field.
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Sopcak T, Medvecky L, Giretova M, Stulajterova R, Brus J, Urbanova M, Kromka F, Podobova M, Faberova M. Fabrication of a glycerol-citrate polymer coated tricalcium phosphate bone cements: Structural investigation and material properties. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02596-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Coppel Y, Prigent Y, Grégoire G. Characterization of hydrogenated dentin components by advanced 1H solid-state NMR experiments. Acta Biomater 2021; 120:156-166. [PMID: 32860946 DOI: 10.1016/j.actbio.2020.08.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/30/2020] [Accepted: 08/15/2020] [Indexed: 12/20/2022]
Abstract
Collecting information about molecular organisation on biological materials such as bone and dentin represents a major challenge in attaining a better understanding of their mechanical properties. To that end, solid state Nuclear Magnetic Resonance (ssNMR) spectroscopic study is an appropriate strategy to provide atomic structural details on these amorphous composite materials. However, species like water molecules and hydroxyl groups are usually observed through 1H magic angle spinning (MAS) ssNMR that suffers from poor resolution due to strong signal overlapping, making their identification difficult. This paper proposes a set of ssNMR experiments for 1H characterization of the main components of human dentin, based on homo- and hetero-nuclear dipolar couplings and composed mostly of fast 1D experiments. The 1H assignment is assisted by straightforward sample modifications: vacuum drying, deuterium exchange and demineralization. These experiments allow the hydrogen signal edition of dentin species like water molecules, HPO42- and OH- groups, depending on their localization (bound to the organic phase, linked to apatite or at the interface) and their dynamic behaviour. This ssNMR toolbox has the potential to provide important structural and dynamic information on chemical and physical modifications of biomaterials. STATEMENT OF SIGNIFICANCE: Molecular characterisation of apatitic biomaterials by biophysical techniques is extremely difficult due to their complex and amorphous nature. It is, however, crucial to obtain such information if we want to understand their mechanical properties in relation to their physical state, for example their hydration levels. In this article we used a set of solid state NMR experiments and sample modifications to distinguish 1H signal of human dentin components with a particular attention to water molecules, known for their major role in biomaterial structuring.
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Affiliation(s)
- Yannick Coppel
- Laboratoire de Chimie de Coordination UPR8241, CNRS, 205 Rte de Narbonne, F-31077, Toulouse Cedex 04, France.
| | - Yann Prigent
- Institut de Chimie de Toulouse (ICT) - FR 2599, Faculté des Sciences et de l'Ingénierie, Université Toulouse III, 31062 Toulouse, France
| | - Geneviève Grégoire
- Faculté d'Odontologie, Toulouse Cedex 31062; Unité de Recherche Biomatériaux Innovants et Interfaces EA4462/URB2i, Université Paris, 92120, France
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Gómez-Cerezo MN, Peña J, Ivanovski S, Arcos D, Vallet-Regí M, Vaquette C. Multiscale porosity in mesoporous bioglass 3D-printed scaffolds for bone regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 120:111706. [PMID: 33545865 DOI: 10.1016/j.msec.2020.111706] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/29/2020] [Accepted: 11/04/2020] [Indexed: 12/16/2022]
Abstract
In order to increase the bone forming ability of MBG-PCL composite scaffold, microporosity was created in the struts of 3D-printed MBG-PCL scaffolds for the manufacturing of a construct with a multiscale porosity consisting of meso- micro- and macropores. 3D-printing imparted macroporosity while the microporosity was created by porogen removal from the struts, and the MBG particles were responsible for the mesoporosity. The scaffolds were 3D-printed using a mixture of PCL, MBG and phosphate buffered saline (PBS) particles, subsequently leached out. Microporous-PCL (pPCL) as a negative control, microporous MBG-PCL (pMBG-PCL) and non-microporous-MBG-PCL (MBG-PCL) were investigated. Scanning electron microscopy, mercury intrusion porosimetry and micro-computed tomography demonstrated that the PBS removal resulted in the formation of micropores inside the struts with porosity of around 30% for both pPCL and pMBG-PCL, with both constructs displaying an overall porosity of 8090%. In contrast, the MBG-PCL group had a microporosity of 6% and an overall porosity of 70%. Early mineralisation was found in the pMBG-PCL post-leaching out and this resulted in the formation a more homogeneous calcium phosphate layer when using a biomimetic mineralisation assay. Mechanical properties ranged from 5 to 25 MPa for microporous and non-microporous specimens, hence microporosity was the determining factor affecting compressive properties. MC3T3-E1 metabolic activity was increased in the pMBG-PCL along with an increased production of RUNX2. Therefore, the microporosity within a 3D-printed bioceramic composite construct may result in additional physical and biological benefits.
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Affiliation(s)
| | - Juan Peña
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Madrid, Spain
| | - Sašo Ivanovski
- The University of Queensland, School of Dentistry, Herston, QLD, Australia
| | - Daniel Arcos
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Madrid, Spain
| | - María Vallet-Regí
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Madrid, Spain
| | - Cedryck Vaquette
- The University of Queensland, School of Dentistry, Herston, QLD, Australia.
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12
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Iline-Vul T, Nanda R, Mateos B, Hazan S, Matlahov I, Perelshtein I, Keinan-Adamsky K, Althoff-Ospelt G, Konrat R, Goobes G. Osteopontin regulates biomimetic calcium phosphate crystallization from disordered mineral layers covering apatite crystallites. Sci Rep 2020; 10:15722. [PMID: 32973201 PMCID: PMC7518277 DOI: 10.1038/s41598-020-72786-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 09/07/2020] [Indexed: 02/06/2023] Open
Abstract
Details of apatite formation and development in bone below the nanometer scale remain enigmatic. Regulation of mineralization was shown to be governed by the activity of non-collagenous proteins with many bone diseases stemming from improper activity of these proteins. Apatite crystal growth inhibition or enhancement is thought to involve direct interaction of these proteins with exposed faces of apatite crystals. However, experimental evidence of the molecular binding events that occur and that allow these proteins to exert their functions are lacking. Moreover, recent high-resolution measurements of apatite crystallites in bone have shown that individual crystallites are covered by a persistent layer of amorphous calcium phosphate. It is therefore unclear whether non-collagenous proteins can interact with the faces of the mineral crystallites directly and what are the consequences of the presence of a disordered mineral layer to their functionality. In this work, the regulatory effect of recombinant osteopontin on biomimetic apatite is shown to produce platelet-shaped apatite crystallites with disordered layers coating them. The protein is also shown to regulate the content and properties of the disordered mineral phase (and sublayers within it). Through solid-state NMR atomic carbon-phosphorous distance measurements, the protein is shown to be located in the disordered phases, reaching out to interact with the surfaces of the crystals only through very few sidechains. These observations suggest that non-phosphorylated osteopontin acts as regulator of the coating mineral layers and exerts its effect on apatite crystal growth processes mostly from afar with a limited number of contact points with the crystal.
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Affiliation(s)
- Taly Iline-Vul
- Department of Chemistry, Bar Ilan University, 5290002, Ramat Gan, Israel
| | - Raju Nanda
- Department of Chemistry, Bar Ilan University, 5290002, Ramat Gan, Israel
| | - Borja Mateos
- Max F. Perutz Laboratories, Department of Computational and Structural Biology, University of Vienna, 1030, Vienna, Austria
| | - Shani Hazan
- Department of Chemistry, Bar Ilan University, 5290002, Ramat Gan, Israel
| | - Irina Matlahov
- Department of Chemistry, Bar Ilan University, 5290002, Ramat Gan, Israel
| | - Ilana Perelshtein
- Department of Chemistry, Bar Ilan University, 5290002, Ramat Gan, Israel
| | | | | | - Robert Konrat
- Max F. Perutz Laboratories, Department of Computational and Structural Biology, University of Vienna, 1030, Vienna, Austria
| | - Gil Goobes
- Department of Chemistry, Bar Ilan University, 5290002, Ramat Gan, Israel.
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Mocquot C, Attik N, Pradelle-Plasse N, Grosgogeat B, Colon P. Bioactivity assessment of bioactive glasses for dental applications: A critical review. Dent Mater 2020; 36:1116-1143. [PMID: 32605848 DOI: 10.1016/j.dental.2020.03.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 03/19/2020] [Accepted: 03/19/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE In the context of minimally invasive dentistry and tissue conservation, bioactive products are valuable. The aim of this review was to identify, clarify, and classify the methodologies used to quantify the bioactive glasses bioactivity. METHODS Specific search strategies were performed in electronic databases: PubMed, Embase, Cochrane Library, and Scopus. Papers were selected after a review of their title, abstract, and full text. The following data were then examined for final selection: BAG investigated, objectives, criteria, methods, and outcomes. RESULTS Sixty-one studies published from 2001 to 2019, were included. The bioactivity of BAG can be evaluated in vitro in contact with solutions, enamel, dentin, or cells. Other studies have conducted in vivo evaluation by BAG contact with dentin and dental pulp. Studies have used various analysis techniques: evaluation of apatite with or without characterization or assessment of mechanical properties. Reprecipitation mechanisms and pulp cell stimulation are treated together through the term 'bioactivity'. SIGNIFICANCE Based on these results, we suggested a classification of methodologies for a better understanding of the bioactive properties of BAG. According to all in vitro studies, BAG appear to be bioactive materials. No consensus has been reached on the results of in vivo studies, and no comparison has been conducted between protocols to assess the bioactivity of other bioactive competitor products.
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Affiliation(s)
- Caroline Mocquot
- Université de Lyon - Université Claude Bernard Lyon 1, UMR CNRS 5615, Laboratoire des Multimatériaux et Interfaces, 69372 Lyon Cedex 08, France; Assistance Publique-Hôpitaux de Paris, Hôpital Rothschild, Service d'Odontologie, Université de Paris, Faculté dentaire, France.
| | - Nina Attik
- Université de Lyon - Université Claude Bernard Lyon 1, UMR CNRS 5615, Laboratoire des Multimatériaux et Interfaces, 69372 Lyon Cedex 08, France; Université de Lyon, Université Claude Bernard Lyon 1, Faculté d'Odontologie, 69008 Lyon, France.
| | - Nelly Pradelle-Plasse
- Université de Lyon - Université Claude Bernard Lyon 1, UMR CNRS 5615, Laboratoire des Multimatériaux et Interfaces, 69372 Lyon Cedex 08, France; Assistance Publique-Hôpitaux de Paris, Hôpital Rothschild, Service d'Odontologie, Université de Paris, Faculté dentaire, France
| | - Brigitte Grosgogeat
- Université de Lyon - Université Claude Bernard Lyon 1, UMR CNRS 5615, Laboratoire des Multimatériaux et Interfaces, 69372 Lyon Cedex 08, France; Université de Lyon, Université Claude Bernard Lyon 1, Faculté d'Odontologie, 69008 Lyon, France; Hospices civils de Lyon, Service d'Odontologie, 69007 Lyon, France
| | - Pierre Colon
- Université de Lyon - Université Claude Bernard Lyon 1, UMR CNRS 5615, Laboratoire des Multimatériaux et Interfaces, 69372 Lyon Cedex 08, France; Assistance Publique-Hôpitaux de Paris, Hôpital Rothschild, Service d'Odontologie, Université de Paris, Faculté dentaire, France
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Zhang J, Wang J, Ma C, Lu J. Hydroxyapatite Formation Coexists with Amyloid-like Self-Assembly of Human Amelogenin. Int J Mol Sci 2020; 21:E2946. [PMID: 32331340 PMCID: PMC7216246 DOI: 10.3390/ijms21082946] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/28/2020] [Accepted: 04/07/2020] [Indexed: 12/19/2022] Open
Abstract
Tooth enamel is formed in an extracellular environment. Amelogenin, the major component in the protein matrix of tooth enamel during the developing stage, could assemble into high molecular weight structures, regulating enamel formation. However, the molecular structure of amelogenin protein assembly at the functional state is still elusive. In this work, we found that amelogenin is able to induce calcium phosphate minerals into hydroxyapatite (HAP) structure in vitro at pH 6.0. Assessed using X-ray diffraction (XRD) and 31P solid-state NMR (SSNMR) evidence, the formed HAP mimics natural enamel closely. The structure of amelogenin protein assembly coexisting with the HAP was also studied using atomic force microscopy (AFM), transmission electron microscopy (TEM) and XRD, indicating the β-amyloid structure of the protein. SSNMR was proven to be an important tool in detecting both the rigid and dynamic components of the protein assembly in the sample, and the core sequence 18EVLTPLKWYQSI29 was identified as the major segment contributing to the β-sheet secondary structure. Our research suggests an amyloid structure may be an important factor in controlling HAP formation at the right pH conditions with the help of other structural components in the protein assembly.
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Affiliation(s)
- Jing Zhang
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; (J.Z.); (J.W.); (C.M.)
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai 200031, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian Wang
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; (J.Z.); (J.W.); (C.M.)
| | - Chengwei Ma
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; (J.Z.); (J.W.); (C.M.)
| | - Junxia Lu
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; (J.Z.); (J.W.); (C.M.)
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15
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Wan B, Huang R, Diaz JM, Tang Y. Polyphosphate Adsorption and Hydrolysis on Aluminum Oxides. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:9542-9552. [PMID: 31313918 DOI: 10.1021/acs.est.9b01876] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The geochemical behaviors of phosphate-containing species at mineral-water interfaces are of fundamental importance for controlling phosphorus mobility, fate, and bioavailability. This study investigates the sorption and hydrolysis of polyphosphate (a group of important long-chained phosphate molecules) on aluminum oxides in the presence of divalent metal cations (Ca2+, Cu2+, Mg2+, Mn2+, and Zn2+) at pH 6-8. γ-Al2O3 with three particle sizes (5, 35, and 70 nm) was used as an analogue of natural aluminum oxides to investigate the particle size effect. All metal cations enhanced polyphosphate hydrolysis at different levels, with Ca2+ showing the most significant enhancement, and the difference in the enhancement might be due to the intrinsic affinity of metal cations to polyphosphate. In the presence of Ca2+, the hydrolysis rate decreased with increasing mineral particle size. Solid-state 31P nuclear magnetic resonance spectroscopy (NMR) revealed the main surface P species to be amorphous calcium phosphate precipitates, phosphate groups in polyphosphate that formed direct bonds with the mineral surface as inner-sphere complexes, and phosphate groups in polyphosphate that were not directly bonded to the mineral surfaces. Our results reveal the critical roles of mineral-water interface processes and divalent metal cations on controlling polyphosphate speciation and transformation and phosphorus cycling.
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Affiliation(s)
- Biao Wan
- School of Earth and Atmospheric Sciences , Georgia Institute of Technology , 311 Ferst Drive , Atlanta , Georgia 30332-0340 , United States
| | - Rixiang Huang
- School of Earth and Atmospheric Sciences , Georgia Institute of Technology , 311 Ferst Drive , Atlanta , Georgia 30332-0340 , United States
| | - Julia M Diaz
- Skidaway Institute of Oceanography, Department of Marine Sciences , University of Georgia , Savannah , Georgia 31411-1011 , United States
| | - Yuanzhi Tang
- School of Earth and Atmospheric Sciences , Georgia Institute of Technology , 311 Ferst Drive , Atlanta , Georgia 30332-0340 , United States
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16
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Marti-Muñoz J, Xuriguera E, Layton JW, Planell JA, Rankin SE, Engel E, Castaño O. Feasible and pure P 2O 5-CaO nanoglasses: An in-depth NMR study of synthesis for the modulation of the bioactive ion release. Acta Biomater 2019; 94:574-584. [PMID: 31141734 DOI: 10.1016/j.actbio.2019.05.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 05/19/2019] [Accepted: 05/24/2019] [Indexed: 12/12/2022]
Abstract
The use of bioactive glasses (e.g. silicates, phosphates, borates) has demonstrated to be an effective therapy for the restoration of bone fractures, wound healing and vascularization. Their partial dissolution towards the surrounding tissue has shown to trigger positive bioactive responses, without the necessity of using growth factors or cell therapy, which reduces money-costs, side effects and increases their translation to the clinics. However, bioactive glasses often need from stabilizers (e.g. SiO44-, Ti4+, Co2+, etc.) that are not highly abundant in the body and which metabolization is not fully understood. In this study, we were focused on synthesizing pure calcium phosphate glasses without the presence of such stabilizers. We combined a mixture of ethylphosphate and calcium 2-methoxyethoxide to synthesize nanoparticles with different compositions and degradability. Synthesis was followed by an in-depth nuclear magnetic resonance characterization, complemented with other techniques that helped us to correlate the chemical structure of the glasses with their physiochemical properties and reaction mechanism. After synthesis, the organically modified xerogel (i.e. calcium monoethylphosphate) was treated at 200 or 350 °C and its solubility was maintained and controlled due to the elimination of organics, increase of phosphate-calcium interactions and phosphate polycondensation. To the best of our knowledge, we are reporting the first sol-gel synthesis of binary (P2O5-CaO) calcium phosphate glass nanoparticles in terms of continuous polycondensated phosphate chains structure without the addition of extra ions. The main goal is to straightforward the synthesis, to get a safer metabolization and to modulate the bioactive ion release. Additionally, we shed light on the chemical structure, reaction mechanism and properties of calcium phosphate glasses with high calcium contents, which nowadays are poorly understood. STATEMENT OF SIGNIFICANCE: The use of bioactive inorganic materials (i.e. bioactive ceramics, glass-ceramics and glasses) for biomedical applications is attractive due to their good integration with the host tissue without the necessity of adding exogenous cells or growth factors. In particular, degradable calcium phosphate glasses are completely resorbable, avoiding the retention in the body of the highly stable silica network of silicate glasses, and inducing a more controllable degradability than bioactive ceramics. However, most calcium phosphate glasses include the presence of stabilizers (e.g. Ti4+, Na+, Co2+), which metabolization is not fully understood and complicates their synthesis. The development of binary calcium phosphate glasses with controlled degradability reduces these limitations, offering a simple and completely metabolizable material with higher transfer to the clinics.
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Affiliation(s)
- Joan Marti-Muñoz
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Elena Xuriguera
- Materials Science and Physical Chemistry Department, University of Barcelona (UB), 08028 Barcelona, Spain
| | - John W Layton
- Department of Chemistry, University of Kentucky (UKY), Lexington, KY 40506-0053, USA
| | - Josep A Planell
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Stephen E Rankin
- Chemical and Materials Engineering Department, University of Kentucky (UKY), Lexington, KY 40506-0053, USA
| | - Elisabeth Engel
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain; Materials Science and Metallurgy Department (EEBE), Technical University of Catalonia (UPC), 08019 Barcelona, Spain.
| | - Oscar Castaño
- Serra Hunter Fellow, Electronics and Biomedical Engineering Department, University of Barcelona (UB), 08028 Barcelona, Spain; Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain; Institute of Nanoscience and Nanotechnology Department, University of Barcelona (UB), 08028 Barcelona, Spain.
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17
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Gómez-Cerezo N, Casarrubios L, Saiz-Pardo M, Ortega L, de Pablo D, Díaz-Güemes I, Fernández-Tomé B, Enciso S, Sánchez-Margallo FM, Portolés MT, Arcos D, Vallet-Regí M. Mesoporous bioactive glass/ɛ-polycaprolactone scaffolds promote bone regeneration in osteoporotic sheep. Acta Biomater 2019; 90:393-402. [PMID: 30965142 PMCID: PMC6726488 DOI: 10.1016/j.actbio.2019.04.019] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 03/19/2019] [Accepted: 04/05/2019] [Indexed: 12/20/2022]
Abstract
Macroporous scaffolds made of a SiO2-CaO-P2O5 mesoporous bioactive glass (MBG) and ɛ-polycaprolactone (PCL) have been prepared by robocasting. These scaffolds showed an excellent in vitro biocompatibility in contact with osteoblast like cells (Saos 2) and osteoclasts derived from RAW 264.7 macrophages. In vivo studies were carried out by implantation into cavitary defects drilled in osteoporotic sheep. The scaffolds evidenced excellent bone regeneration properties, promoting new bone formation at both the peripheral and the inner parts of the scaffolds, thick trabeculae, high vascularization and high presence of osteoblasts and osteoclasts. In order to evaluate the effects of the local release of an antiosteoporotic drug, 1% (%wt) of zoledronic acid was incorporated to the scaffolds. The scaffolds loaded with zoledronic acid induced apoptosis in Saos 2 cells, impeded osteoclast differentiation in a time dependent manner and inhibited bone healing, promoting an intense inflammatory response in osteoporotic sheep. STATEMENT OF SIGNIFICANCE: In addition to an increase in bone fragility and susceptibility to fracture, osteoporosis also hinders the clinical success of endosseous implants and grafting materials for the treatment of bone defects. For the first time, macroporous scaffolds made of mesoporous bioactive glass and ε-caprolactone have been evaluated in a sheep model that mimics the osteoporosis conditions in humans. These implants fostered bone regeneration, promoting new bone formation at both the peripheral and the inner parts of the scaffolds, showing thick trabeculae and a high vascularization degree. Our results indicate that macroporous structures containing highly bioactive mesoporous glasses could be excellent candidates for the regenerative treatment of bone defects in osteoporotic patients.
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Affiliation(s)
- N Gómez-Cerezo
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital, 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain
| | - L Casarrubios
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - M Saiz-Pardo
- Servicio de Anatomía Patológica. Hospital Clínico San Carlos, Facultad de Medicina Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - L Ortega
- Servicio de Anatomía Patológica. Hospital Clínico San Carlos, Facultad de Medicina Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - D de Pablo
- Servicio de Anatomía Patológica. Hospital Clínico San Carlos, Facultad de Medicina Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - I Díaz-Güemes
- Centro de Cirugía de Mínima Invasión Jesús Usón, Cáceres, Spain
| | | | - S Enciso
- Centro de Cirugía de Mínima Invasión Jesús Usón, Cáceres, Spain
| | | | - M T Portolés
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain.
| | - D Arcos
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital, 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain.
| | - M Vallet-Regí
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital, 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain.
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18
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Casarrubios L, Gómez-Cerezo N, Feito MJ, Vallet-Regí M, Arcos D, Portolés MT. Incorporation and effects of mesoporous SiO 2-CaO nanospheres loaded with ipriflavone on osteoblast/osteoclast cocultures. Eur J Pharm Biopharm 2018; 133:258-268. [PMID: 30385420 DOI: 10.1016/j.ejpb.2018.10.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/12/2018] [Accepted: 10/28/2018] [Indexed: 12/19/2022]
Abstract
Mesoporous nanospheres in the system SiO2-CaO (NanoMBGs) with a hollow core surrounded by a radial arrangement of mesopores were characterized, labeled with FITC (FITC-NanoMBGs) and loaded with ipriflavone (NanoMBG-IPs) in order to evaluate their incorporation and their effects on both osteoblasts and osteoclasts simultaneously and maintaining the communication with each other in coculture. The influence of these nanospheres on macrophage polarization towards pro-inflammatory M1 or reparative M2 phenotypes was also evaluated in basal and stimulated conditions through the expression of CD80 (as M1 marker) and CD206 (as M2 marker) by flow cytometry and confocal microscopy. NanoMBGs did not induce the macrophage polarization towards the M1 pro-inflammatory phenotype, favoring the M2 reparative phenotype and increasing the macrophage response capability against stimuli as LPS and IL-4. NanoMBG-IPs induced a significant decrease of osteoclast proliferation and resorption activity after 7 days in coculture with osteoblasts, without affecting osteoblast proliferation and viability. Drug release test demonstrated that only a fraction of the payload is released by diffusion, whereas the rest of the drug remains within the hollow core after 7 days, thus ensuring the local long-term pharmacological treatment beyond the initial fast IP release. All these data ensure an appropriate immune response to these nanospheres and the potential application of NanoMBG-IPs as local drug delivery system in osteoporotic patients.
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Affiliation(s)
- Laura Casarrubios
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - Natividad Gómez-Cerezo
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Madrid, Spain
| | - María José Feito
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - María Vallet-Regí
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Madrid, Spain.
| | - Daniel Arcos
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Madrid, Spain.
| | - María Teresa Portolés
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain.
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19
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Contrasting In Vitro Apatite Growth from Bioactive Glass Surfaces with that of Spontaneous Precipitation. MATERIALS 2018; 11:ma11091690. [PMID: 30213057 PMCID: PMC6164250 DOI: 10.3390/ma11091690] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 08/27/2018] [Accepted: 09/05/2018] [Indexed: 11/17/2022]
Abstract
Body-fluid-exposed bioactive glasses (BGs) integrate with living tissues due to the formation of a biomimetic surface layer of calcium hydroxy-carbonate apatite (HCA) with a close composition to bone mineral. Vast efforts have been spent to understand the mechanisms underlying in vitro apatite mineralization, as either formed by direct precipitation from supersaturated solutions, or from BG substrates in a simulated body fluid (SBF). Formally, these two scenarios are distinct and have hitherto been discussed as such. Herein, we contrast them and identify several shared features. We monitored the formation of amorphous calcium phosphate (ACP) and its crystallization into HCA from a Na 2 O⁻CaO⁻SiO 2 ⁻P 2 O 5 glass exposed to SBF for variable periods out to 28 days. The HCA growth was assessed semi-quantitatively by Fourier transform infrared spectroscopy and powder X-ray diffraction, with the evolution of the relative apatite content for increasing SBF-exposure periods evaluated against trends in Ca and P concentrations in the accompanying solutions. This revealed a sigmoidal apatite growth behavior, well-known to apply to spontaneously precipitated apatite. The results are discussed in relation to the prevailing mechanism proposed for in vitro HCA formation from silicate-based BGs, where we highlight largely simultaneous growth processes of ACP and HCA.
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Gómez-Cerezo N, Verron E, Montouillout V, Fayon F, Lagadec P, Bouler JM, Bujoli B, Arcos D, Vallet-Regí M. The response of pre-osteoblasts and osteoclasts to gallium containing mesoporous bioactive glasses. Acta Biomater 2018; 76:333-343. [PMID: 29966758 DOI: 10.1016/j.actbio.2018.06.036] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 06/11/2018] [Accepted: 06/28/2018] [Indexed: 12/11/2022]
Abstract
Mesoporous bioactive glasses (MBGs) in the system SiO2-CaO-P2O5-Ga2O3 have been synthesized by the evaporation induced self-assembly method and subsequent impregnation with Ga cations. Two different compositions have been prepared and the local environment of Ga(III) has been characterized using 29Si, 71Ga and 31P NMR analysis, demonstrating that Ga(III) is efficiently incorporated as both, network former (GaO4 units) and network modifier (GaO6 units). In vitro bioactivity tests evidenced that Ga-containing MBGs retain their capability for nucleation and growth of an apatite-like layer in contact with a simulated body fluid with ion concentrations nearly equal to those of human blood plasma. Finally, in vitro cell culture tests evidenced that Ga incorporation results in a selective effect on osteoblasts and osteoclasts. Indeed, the presence of this element enhances the early differentiation towards osteoblast phenotype while disturbing osteoclastogenesis. Considering these results, Ga-doped MBGs might be proposed as bone substitutes, especially in osteoporosis scenarios. STATEMENT OF SIGNIFCANCE Osteoporosis is the most prevalent bone disease affecting millions of patients every year. However, there is a lack of bone grafts specifically designed for the treatment of bone defects occurred because of osteoporotic fractures. The consequence is that osteoporotic bone defects are commonly treated with the same biomaterials intended for high quality bone tissue. In this work we have prepared mesoporous bioactive glasses doped with gallium, demonstrating osteoinductive capability by promoting the differentiation of pre-osteoblast toward osteoblasts and partial inhibition of osteoclastogenesis. Through a deep study of the local environment of gallium within the mesoporous matrix, this work shows that gallium release is not required to produce this effect on osteoblasts and osteoclasts. In this sense, the presence of this element at the surface of the mesoporous bioactive glasses would be enough to locally promote bone formation while reducing bone resorption.
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Affiliation(s)
- N Gómez-Cerezo
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain
| | - E Verron
- Université de Nantes, CNRS, UMR 6230, CEISAM, UFR Sciences et Techniques, 2 Rue de la Houssinière, 44322 NANTES Cedex 3, France
| | - V Montouillout
- CNRS, UPR 3079, CEMHTI, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 02, France
| | - F Fayon
- CNRS, UPR 3079, CEMHTI, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 02, France
| | - P Lagadec
- Université Côte d'Azur, CNRS, Inserm, Institut de Biologie Valrose (iBV), 28 Av. de Valombrose, 06107 Nice Cedex 2, France
| | - J M Bouler
- Université de Nantes, CNRS, UMR 6230, CEISAM, UFR Sciences et Techniques, 2 Rue de la Houssinière, 44322 NANTES Cedex 3, France
| | - B Bujoli
- Université de Nantes, CNRS, UMR 6230, CEISAM, UFR Sciences et Techniques, 2 Rue de la Houssinière, 44322 NANTES Cedex 3, France
| | - D Arcos
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain.
| | - M Vallet-Regí
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER de Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain.
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21
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Sheikh JA, Bakhmutov VI, Clearfield A. Layered metal(IV) phosphonate materials: Solid-state 1 H, 13 C, 31 P NMR spectra and NMR relaxation. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:276-284. [PMID: 29253324 DOI: 10.1002/mrc.4698] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 11/29/2017] [Accepted: 12/02/2017] [Indexed: 06/07/2023]
Abstract
Multinuclear solid-state NMR and powder X-ray diffraction data collected for phosphonate materials Zr(O3 PC6 H4 PO3 ) · 3.6H2 O and Sn(O3 PC6 H4 PO3 )0.85 (O3 POH)0.30 · 3.09H2 O have resulted in the layered structure, where the phosphonic acids cross-link the layers. The main structural motif (the 111 connectivity in the PO3 group) has been established by determination of chemical shift anisotropy parameters for phosphorus nuclei in the phosphonate groups. An analysis of the variable-temperature 31 P T1 measurements and the shapes of the phosphorus resonances in the 31 P static NMR spectra have resulted in the dipolar mechanism of the phosphorus spin-lattice relaxation, where the rotating phenylene rings reorient dipolar vectors P… H as a driving force of the relaxation process. It has been found that water protons do not affect the 31 P T1 times. The activation energy of the phenylene rotation in both compounds has been determined as low as 12.5 kJ/mol. The interpretation of the phosphorus relaxation data has been independently confirmed by the measurements of 1 H T1 times for protons of the phenylene rings.
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Affiliation(s)
- Javeed Ahmad Sheikh
- Department of Chemistry, Texas A&M University, College Station, TX, 77845-3012, USA
| | - Vladimir I Bakhmutov
- Laboratory for Nuclear Magnetic Resonance, Department of Chemistry, Texas A&M University, College Station, TX, 77842-3012, USA
| | - Abraham Clearfield
- Department of Chemistry, Texas A&M University, College Station, TX, 77845-3012, USA
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22
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González-Villegas J, Kan Y, Bakhmutov VI, García-Vargas A, Martínez M, Clearfield A, Colón JL. Poly(ethylene glycol)-modified zirconium phosphate nanoplatelets for improved doxorubicin delivery. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.05.057] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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Gosecki M, Kazmierski S, Gosecka M. Diffusion-Controllable Biomineralization Conducted In Situ in Hydrogels Based on Reversibly Cross-Linked Hyperbranched Polyglycidol. Biomacromolecules 2017; 18:3418-3431. [DOI: 10.1021/acs.biomac.7b01071] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Mateusz Gosecki
- Centre of Molecular and Macromolecular
Studies, Polish Academy of Sciences, ul. Sienkiewicza 112, 90-363 Lodz, Poland
| | - Slawomir Kazmierski
- Centre of Molecular and Macromolecular
Studies, Polish Academy of Sciences, ul. Sienkiewicza 112, 90-363 Lodz, Poland
| | - Monika Gosecka
- Centre of Molecular and Macromolecular
Studies, Polish Academy of Sciences, ul. Sienkiewicza 112, 90-363 Lodz, Poland
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24
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Andreev AS, Bulina NV, Chaikina MV, Prosanov IY, Terskikh VV, Lapina OB. Solid-state NMR and computational insights into the crystal structure of silicocarnotite-based bioceramic materials synthesized mechanochemically. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:151-157. [PMID: 28258809 DOI: 10.1016/j.ssnmr.2017.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 01/15/2017] [Accepted: 02/14/2017] [Indexed: 06/06/2023]
Abstract
In this work, we report the results of a detailed structural study of a promising bioceramic material silicocarnotite Ca5(PO4)2SiO4 (SC) synthesized from mechanochemically treated nanosized silicon-substituted hydroxyapatite by annealing at 1000°C. This novel synthetic approach represents an attractive and efficient route towards large-scale manufacturing of the silicocarnotite-based bioceramics. A combination of solid-state nuclear magnetic resonance (NMR), powder X-ray crystallography and density function theory (DFT) calculations has been implemented to characterize the phase composition of the prepared composite materials and to gain insight into the crystal structure of silicocarnotite. The phase composition analysis based on the multinuclear solid-state NMR has been found in agreement with X-ray powder diffraction indicating the minority phases of CaO (5-6wt%) and residual silicon-apatite (7-8wt%), while the rest of the material being a fairly crystalline silicocarnotite phase (86-88wt%). A combination of computational (CASTEP) and experimental methods was used to address the anionic site disorder in the silicocarnotite crystal structure. Distorted [OPO3] pyramids have appeared as an important structural motif in the SC crystal structure. The ratio between regular [PO4] and distorted [OPO3] tetrahedra is found between 2:1 and 3:1 based on XRD experiments and CASTEP calculations. The natural abundance 43Ca magic angle spinning NMR spectra of silicocarnotite are reported for the first time.
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Affiliation(s)
- A S Andreev
- Boreskov Institute of Catalysis SB RAS, pr. Lavrentieva 5, 630090 Novosibirsk, Russian Federation; Novosibirsk State University, Pirogova st. 2, 630090 Novosibirsk, Russian Federation.
| | - N V Bulina
- Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze st. 18, 630128 Novosibirsk, Russian Federation
| | - M V Chaikina
- Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze st. 18, 630128 Novosibirsk, Russian Federation
| | - I Yu Prosanov
- Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze st. 18, 630128 Novosibirsk, Russian Federation
| | - V V Terskikh
- Department of Chemistry, University of Ottawa, Ottawa, ON, Canada K1N 6N5
| | - O B Lapina
- Boreskov Institute of Catalysis SB RAS, pr. Lavrentieva 5, 630090 Novosibirsk, Russian Federation; Novosibirsk State University, Pirogova st. 2, 630090 Novosibirsk, Russian Federation
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25
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Mathew R, Turdean-Ionescu C, Yu Y, Stevensson B, Izquierdo-Barba I, García A, Arcos D, Vallet-Regí M, Edén M. Proton Environments in Biomimetic Calcium Phosphates Formed from Mesoporous Bioactive CaO-SiO 2-P 2O 5 Glasses in Vitro: Insights from Solid-State NMR. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:13223-13238. [PMID: 28663772 PMCID: PMC5484558 DOI: 10.1021/acs.jpcc.7b03469] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 05/23/2017] [Indexed: 05/26/2023]
Abstract
When exposed to body fluids, mesoporous bioactive glasses (MBGs) of the CaO-SiO2-P2O5 system develop a bone-bonding surface layer that initially consists of amorphous calcium phosphate (ACP), which transforms into hydroxy-carbonate apatite (HCA) with a very similar composition as bone/dentin mineral. Information from various 1H-based solid-state nuclear magnetic resonance (NMR) experiments was combined to elucidate the evolution of the proton speciations both at the MBG surface and within each ACP/HCA constituent of the biomimetic phosphate layer formed when each of three MBGs with distinct Ca, Si, and P contents was immersed in a simulated body fluid (SBF) for variable periods between 15 min and 30 days. Directly excited magic-angle-spinning (MAS) 1H NMR spectra mainly reflect the MBG component, whose surface is rich in water and silanol (SiOH) moieties. Double-quantum-single-quantum correlation 1H NMR experimentation at fast MAS revealed their interatomic proximities. The comparatively minor H species of each ACP and HCA component were probed selectively by heteronuclear 1H-31P NMR experimentation. The initially prevailing ACP phase comprises H2O and "nonapatitic" HPO42-/PO43- groups, whereas for prolonged MBG soaking over days, a well-progressed ACP → HCA transformation was evidenced by a dominating O1H resonance from HCA. We show that 1H-detected 1H → 31P cross-polarization NMR is markedly more sensitive than utilizing powder X-ray diffraction or 31P NMR for detecting the onset of HCA formation, notably so for P-bearing (M)BGs. In relation to the long-standing controversy as to whether bone mineral comprises ACP and/or forms via an ACP precursor, we discuss a recently accepted structural core-shell picture of both synthetic and biological HCA, highlighting the close relationship between the disordered surface layer and ACP.
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Affiliation(s)
- Renny Mathew
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Claudia Turdean-Ionescu
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Yang Yu
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Baltzar Stevensson
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Isabel Izquierdo-Barba
- Departamento
de Química Inorgánica y Bioinorgánica,
Facultad de Farmacia, Universidad Complutense
de Madrid, Instituto
de Investigación Sanitaria Hospital 12 de Octubre i+12, 28040 Madrid, Spain
- Networking
Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Ana García
- Departamento
de Química Inorgánica y Bioinorgánica,
Facultad de Farmacia, Universidad Complutense
de Madrid, Instituto
de Investigación Sanitaria Hospital 12 de Octubre i+12, 28040 Madrid, Spain
- Networking
Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Daniel Arcos
- Departamento
de Química Inorgánica y Bioinorgánica,
Facultad de Farmacia, Universidad Complutense
de Madrid, Instituto
de Investigación Sanitaria Hospital 12 de Octubre i+12, 28040 Madrid, Spain
- Networking
Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - María Vallet-Regí
- Departamento
de Química Inorgánica y Bioinorgánica,
Facultad de Farmacia, Universidad Complutense
de Madrid, Instituto
de Investigación Sanitaria Hospital 12 de Octubre i+12, 28040 Madrid, Spain
- Networking
Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Mattias Edén
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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26
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Aranaz I, Martínez-Campos E, Moreno-Vicente C, Civantos A, García-Arguelles S, Del Monte F. Macroporous Calcium Phosphate/Chitosan Composites Prepared via Unidirectional Ice Segregation and Subsequent Freeze-Drying. MATERIALS 2017; 10:ma10050516. [PMID: 28772874 PMCID: PMC5459033 DOI: 10.3390/ma10050516] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 04/24/2017] [Accepted: 05/01/2017] [Indexed: 01/06/2023]
Abstract
Calcium phosphate chitosan-based composites have gained much interest in recent years for biomedical purposes. In this paper, three-dimensional calcium phosphate chitosan-based composites with different mineral contents were produced using a green method called ice segregation induced self-assembly (ISISA). In this methodology, ice crystals were used as a template to produce porous structures from an aqueous solution of chitosan (CS) and hydroxyapatite (Hap) also containing acetic acid (pH = 4.5). For better characterization of the nature of the inorganic matter entrapped within the resulting composite, we performed either oxygen plasma or calcination processes to remove the organic matter. The nature of the phosphate salts was studied by XRD and NMR studies. Amorphous calcium phosphate (ACP) was identified as the mineral phase in the composites submitted to oxygen plasma, whereas crystalline Hap was obtained after calcination. SEM microscopy revealed the formation of porous structures (porosity around 80–85%) in the original composites, as well as in the inorganic matrices obtained after calcination, with porous channels of up to 50 µm in diameter in the former case and of up to 20 µm in the latter. The biocompatibility of the composites was assessed using two different cell lines: C2C12GFP premyoblastic cells and MC3T3 preosteoblastic cells.
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Affiliation(s)
- Inmaculada Aranaz
- Instituto de Ciencia de Materiales de Madrid-ICMM, Consejo Superior de Investigaciones Científicas-CSIC, Cantoblanco 28049, 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 23, n1 28040, Madrid, Spain.
| | - Carolina Moreno-Vicente
- 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 23, n1 28040, Madrid, Spain.
| | - 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 23, n1 28040, Madrid, Spain.
| | - Sara García-Arguelles
- Instituto de Ciencia de Materiales de Madrid-ICMM, Consejo Superior de Investigaciones Científicas-CSIC, Cantoblanco 28049, Madrid, Spain.
- Departamento de Tecnología Química y Energética, Tecnología Química y Ambiental y Tecnología Mecánica y Química Analítica, Universidad Rey Juan Carlos, Móstoles 28933, Madrid, Spain.
| | - Francisco Del Monte
- Instituto de Ciencia de Materiales de Madrid-ICMM, Consejo Superior de Investigaciones Científicas-CSIC, Cantoblanco 28049, Madrid, Spain.
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27
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De Sa Peixoto P, Silva JVC, Laurent G, Schmutz M, Thomas D, Bouchoux A, Gésan-Guiziou G. How High Concentrations of Proteins Stabilize the Amorphous State of Calcium Orthophosphate: A Solid-State Nuclear Magnetic Resonance (NMR) Study of the Casein Case. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1256-1264. [PMID: 28094949 DOI: 10.1021/acs.langmuir.6b04235] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding how proteins stabilize amorphous calcium ortho-phosphate (ACP) phases is of great importance in biology and for pharmaceutical or food applications. Until now, most of the former investigations about ACP-protein stability and equilibrium were performed under conditions where ACP colloidal nanoclusters are surrounded by low to moderate concentrations of peptides or proteins (15-30 g L-1). As a result, the question of ACP-protein interactions in highly concentrated protein systems has clearly been overlooked, whereas it corresponds to actual industrial conditions such as drying or membrane filtration in the dairy industry for instance. In this study, the structure of an ACP phase is monitored in association with one model phosphorylated protein (casein) using solid-state nuclear magnetic resonance (ssNMR) under two conditions of high protein concentration (300 and 400 g L-1). At both concentrations and at 25 °C, it is found that the caseins maintain the mineral phase in an amorphous form with no detectable influence on its structure or size. Interestingly, and in both cases, a significant amount of the nonphosphorylated side chains interacts with ACP through hydrogen bonds. The number of these interacting side chains is found to be higher at the highest casein concentration. At 45 °C, which is a destabilizing temperature of ACP under protein-free conditions, the amorphous structure of the mineral phase is partially transformed at a casein concentration of 300 g L-1, while it remains almost intact at a casein concentration of 400 g L-1. Therefore, these results clearly indicate that increasing the concentration of proteins favors ACP-protein interactions and stabilizes the ACP clusters more efficiently.
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Affiliation(s)
- Paulo De Sa Peixoto
- Science et Technologie du Lait et de l'Œuf, INRA, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
- AGROCAMPUS OUEST, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
| | - Juliana V C Silva
- Science et Technologie du Lait et de l'Œuf, INRA, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
- AGROCAMPUS OUEST, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
| | - Guillaume Laurent
- Sorbonne Universités , UPMC Univ Paris 6, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Adresse, F-75005 Paris, France
| | - Marc Schmutz
- CAMPUS CNRS, Institut Charles Sadron , 23 rue du LOESS, BP 84047, 70034 Strasbourg, France
| | - Daniel Thomas
- Team Translation and Folding, Université de Rennes 1, UMR CNRS 6290 IGDR , Campus de Beaulieu, 35000 Rennes, France
| | - Antoine Bouchoux
- Science et Technologie du Lait et de l'Œuf, INRA, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
- AGROCAMPUS OUEST, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
| | - Geneviève Gésan-Guiziou
- Science et Technologie du Lait et de l'Œuf, INRA, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
- AGROCAMPUS OUEST, UMR1253 , 65 rue de saint Brieuc, 35000 Rennes, France
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28
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Sun Y, Brauckmann O, Nixdorf DR, Kentgens A, Garwood M, Idiyatullin D, Heerschap A. Imaging human teeth by phosphorus magnetic resonance with nuclear Overhauser enhancement. Sci Rep 2016; 6:30756. [PMID: 27498919 PMCID: PMC4976379 DOI: 10.1038/srep30756] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 07/06/2016] [Indexed: 01/04/2023] Open
Abstract
Three-dimensional phosphorus MR images ((31)P MRI) of teeth are obtained at a nominal resolution of 0.5 mm in less than 15 minutes using acquisition pulse sequences sensitive to ultra-short transversal relaxation times. The images directly reflect the spatially resolved phosphorus content of mineral tissue in dentin and enamel; they show a lack of signal from pulp tissue and reduced signal from de-mineralized carious lesions. We demonstrate for the first time that the signal in (31)P MR images of mineralized tissue is enhanced by a (1)H-(31)P nuclear Overhauser effect (NOE). Using teeth as a model for imaging mineralized human tissue, graded differences in signal enhancement are observed that correlate well with known mineral content. From solid-state NMR experiments we conclude that the NOE is facilitated by spin diffusion and that the NOE difference can be assigned to a higher water content and a different micro-structure of dentin. Thus, a novel method for imaging mineral content without ionizing radiation is proposed. This method has potential use in the assessment of de-mineralization states in humans, such as caries of teeth and osteoporosis of bones.
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Affiliation(s)
- Yi Sun
- Radiology, Radboud University Nijmegen Medical Centre, Geert Grooteplein zuid 10, 6586 GA Nijmegen The Netherlands
| | - Ole Brauckmann
- Solid State NMR, Institute of Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands
| | - Donald R. Nixdorf
- Division of TMD and Orofacial Pain Department of Diagnostic and Biological Sciences, University of Minnesota, 515 Delaware St. SE, Minneapolis, MN 55455, United States
| | - Arno Kentgens
- Solid State NMR, Institute of Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands
| | - Michael Garwood
- Center for Magnetic Resonance Research, University of Minnesota, 2021 Sixth Street SE, Minneapolis, MN 55455, United States
| | - Djaudat Idiyatullin
- Center for Magnetic Resonance Research, University of Minnesota, 2021 Sixth Street SE, Minneapolis, MN 55455, United States
| | - Arend Heerschap
- Radiology, Radboud University Nijmegen Medical Centre, Geert Grooteplein zuid 10, 6586 GA Nijmegen The Netherlands
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29
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Iline-Vul T, Matlahov I, Grinblat J, Keinan-Adamsky K, Goobes G. Changes to the Disordered Phase and Apatite Crystallite Morphology during Mineralization by an Acidic Mineral Binding Peptide from Osteonectin. Biomacromolecules 2015. [PMID: 26207448 DOI: 10.1021/acs.biomac.5b00465] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Noncollagenous proteins regulate the formation of the mineral constituent in hard tissue. The mineral formed contains apatite crystals coated by a functional disordered calcium phosphate phase. Although the crystalline phase of bone mineral was extensively investigated, little is known about the disordered layer's composition and structure, and less is known regarding the function of noncollagenous proteins in the context of this layer. In the current study, apatite was prepared with an acidic peptide (ON29) derived from the bone/dentin protein osteonectin. The mineral formed comprises needle-shaped hydroxyapatite crystals like in dentin and a stable disordered phase coating the apatitic crystals as shown using X-ray diffraction, transmission electron microscopy, and solid-state NMR techniques. The peptide, embedded between the mineral particles, reduces the overall phosphate content in the mineral formed as inferred from inductively coupled plasma and elemental analysis results. Magnetization transfers between disordered phase species and apatitic phase species are observed for the first time using 2D (1)H-(31)P heteronuclear correlation NMR measurements. The dynamics of phosphate magnetization transfers reveal that ON29 decreases significantly the amount of water molecules in the disordered phase and increases slightly their content at the ordered-disordered interface. The peptide decreases hydroxyl to disordered phosphate transfers within the surface layer but does not influence transfer within the bulk crystalline mineral. Overall, these results indicate that control of crystallite morphology and properties of the inorganic component in hard tissue by biomolecules is more involved than just direct interaction between protein functional groups and mineral crystal faces. Subtler mechanisms such as modulation of the disordered phase composition and structural changes at the ordered-disordered interface may be involved.
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Affiliation(s)
- Taly Iline-Vul
- Department of Chemistry, Bar Ilan University , Ramat Gan 52900, Israel
| | - Irina Matlahov
- Department of Chemistry, Bar Ilan University , Ramat Gan 52900, Israel
| | - Judith Grinblat
- Department of Chemistry, Bar Ilan University , Ramat Gan 52900, Israel
| | | | - Gil Goobes
- Department of Chemistry, Bar Ilan University , Ramat Gan 52900, Israel
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30
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Turdean-Ionescu C, Stevensson B, Grins J, Izquierdo-Barba I, García A, Arcos D, Vallet-Regí M, Edén M. Composition-dependent in vitro apatite formation at mesoporous bioactive glass-surfaces quantified by solid-state NMR and powder XRD. RSC Adv 2015. [DOI: 10.1039/c5ra13410b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Solid-state NMR and powder XRD are employed to quantify the ACP (amorphous calcium phosphate) and HCA (hydroxy-carbonate apatite) components grown from three mesoporous bioactive glasses with variable compositions.
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Affiliation(s)
- Claudia Turdean-Ionescu
- Department of Materials and Environmental Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
| | - Baltzar Stevensson
- Department of Materials and Environmental Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
| | - Jekabs Grins
- Department of Materials and Environmental Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
| | - Isabel Izquierdo-Barba
- Departamento de Química Inorgánica y Bioinorgánica
- Facultad de Farmacia
- Universidad Complutense de Madrid
- Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12
- 28040 Madrid
| | - Ana García
- Departamento de Química Inorgánica y Bioinorgánica
- Facultad de Farmacia
- Universidad Complutense de Madrid
- Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12
- 28040 Madrid
| | - Daniel Arcos
- Departamento de Química Inorgánica y Bioinorgánica
- Facultad de Farmacia
- Universidad Complutense de Madrid
- Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12
- 28040 Madrid
| | - María Vallet-Regí
- Departamento de Química Inorgánica y Bioinorgánica
- Facultad de Farmacia
- Universidad Complutense de Madrid
- Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12
- 28040 Madrid
| | - Mattias Edén
- Department of Materials and Environmental Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
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31
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Stevensson B, Mathew R, Edén M. Assessing the Phosphate Distribution in Bioactive Phosphosilicate Glasses by 31P Solid-State NMR and Molecular Dynamics Simulations. J Phys Chem B 2014; 118:8863-76. [DOI: 10.1021/jp504601c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Baltzar Stevensson
- Physical
Chemistry Division, Department of Materials and Environmental
Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Renny Mathew
- Physical
Chemistry Division, Department of Materials and Environmental
Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Mattias Edén
- Physical
Chemistry Division, Department of Materials and Environmental
Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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32
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Monduzzi M, Lampis S, Murgia S, Salis A. From self-assembly fundamental knowledge to nanomedicine developments. Adv Colloid Interface Sci 2014; 205:48-67. [PMID: 24182715 DOI: 10.1016/j.cis.2013.10.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 10/08/2013] [Accepted: 10/08/2013] [Indexed: 02/01/2023]
Abstract
This review highlights the key role of NMR techniques in demonstrating the molecular aspects of the self-assembly of surfactant molecules that nowadays constitute the basic knowledge which modern nanoscience relies on. The aim is to provide a tutorial overview. The story of a rigorous scientific approach to understand self-assembly in surfactant systems and biological membranes starts in the early seventies when the progresses of SAXRD and NMR technological facilities allowed to demonstrate the existence of ordered soft matter, and the validity of Tanford approach concerning self-assembly at a molecular level. Particularly, NMR quadrupolar splittings, NMR chemical shift anisotropy, and NMR relaxation of dipolar and quadrupolar nuclei in micellar solutions, microemulsions, and liquid crystals proved the existence of an ordered polar-apolar interface, on the NMR time scale. NMR data, rationalized in terms of the two-step model of relaxation, allowed to quantify the dynamic aspects of the supramolecular aggregates in different soft matter systems. In addition, NMR techniques allowed to obtain important information on counterion binding as well as on size of the aggregate through molecular self-diffusion. Indeed NMR self-diffusion proved without any doubt the existence of bicontinuous microemulsions and bicontinuous cubic liquid crystals, suggested by pioneering and brilliant interpretation of SAXRD investigations. Moreover, NMR self-diffusion played a fundamental role in the understanding of microemulsion and emulsion nanostructures, phase transitions in phase diagrams, and particularly percolation phenomena in microemulsions. Since the nineties, globalization of the knowledge along with many other technical facilities such as electron microscopy, particularly cryo-EM, produced huge progresses in surfactant and colloid science. Actually we refer to nanoscience: bottom up/top down strategies allow to build nanodevices with applications spanning from ICT to food technology. Developments in the applied fields have also been addressed by important progresses in theoretical skills aimed to understand intermolecular forces, and specific ion interactions. Nevertheless, this is still an open question. Our predictive ability has however increased, hence more ambitious targets can be planned. Nanomedicine represents a major challenging field with its main aims: targeted drug delivery, diagnostic, theranostics, tissue engineering, and personalized medicine. Few recent examples will be mentioned. Although the real applications of these systems still need major work, nevertheless new challenges are open, and perspectives based on integrated multidisciplinary approaches would enable both a deeper basic knowledge and the expected advances in biomedical field.
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Affiliation(s)
- Maura Monduzzi
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy.
| | - Sandrina Lampis
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy
| | - Sergio Murgia
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy
| | - Andrea Salis
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy
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Mathew R, Stevensson B, Tilocca A, Edén M. Toward a rational design of bioactive glasses with optimal structural features: composition-structure correlations unveiled by solid-state NMR and MD simulations. J Phys Chem B 2014; 118:833-44. [PMID: 24364818 PMCID: PMC3905695 DOI: 10.1021/jp409652k] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The
physiological responses of silicate-based bioactive glasses (BGs)
are known to depend critically on both the P content (nP) of the glass and its silicate network connectivity
(N̅BOSi). However, while the bioactivity generally
displays a nonmonotonic dependence on nP itself, recent work suggest that it is merely the net orthophosphate
content that directly links to the bioactivity. We exploit molecular
dynamics (MD) simulations combined with 31P and 29Si solid-state nuclear magnetic resonance (NMR) spectroscopy to explore
the quantitative relationships between N̅BOSi, nP, and the silicate and phosphate speciations in a series
of Na2O–CaO–SiO2–P2O5 glasses spanning 2.1 ≤ N̅BOSi ≤
2.9 and variable P2O5 contents up to 6.0 mol
%. The fractional population of the orthophosphate groups remains
independent of nP at a fixed N̅BOSi-value,
but is reduced slightly as N̅BOSi increases. Nevertheless, P
remains predominantly as readily released orthophosphate ions, whose
content may be altered essentially independently of the network connectivity,
thereby offering a route to optimize the glass bioactivity. We discuss
the observed composition-structure links in relation to known composition-bioactivity
correlations, and define how Na2O–CaO–SiO2–P2O5 compositions exhibiting
an optimal bioactivity can be designed by simultaneously altering
three key parameters: the silicate network connectivity, the (ortho)phosphate
content, and the nNa/nCa molar ratio.
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Affiliation(s)
- Renny Mathew
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University , SE-106 91, Stockholm, Sweden
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Taylor AJ, Rendina E, Smith BJ, Zhou DH. Analyses of mineral specific surface area and hydroxyl substitution for intact bone. Chem Phys Lett 2013; 588. [PMID: 24347673 DOI: 10.1016/j.cplett.2013.09.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Bone minerals possess two primary hydrogen sources: hydroxide ions in the nanocrystalline core and structural water in the amorphous surface layer. In order to accurately measure their concentrations using hydrogen to phosphorus cross polarization NMR spectroscopy, it is necessary to analyze the dependence of signal intensities on serial contact times, namely, cross polarization kinetics. A reliable protocol is developed to iteratively decompose the severely overlapped spectra and to analyze the cross-polarization kinetics, leading to measurement of hydroxyl and structural water concentrations. Structural water concentration is used to estimate mineral specific surface area and nanocrystal thickness for intact bone.
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Affiliation(s)
- Amanda J Taylor
- Department of Physics, Oklahoma State University, Stillwater, OK, USA 74078
| | - Elizabeth Rendina
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK, USA 74078
| | - Brenda J Smith
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK, USA 74078
| | - Donghua H Zhou
- Department of Physics, Oklahoma State University, Stillwater, OK, USA 74078
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Niu LN, Jiao K, Ryou H, Yiu CK, Chen JH, Breschi L, Arola DD, Pashley DH, Tay FR. Multiphase intrafibrillar mineralization of collagen. Angew Chem Int Ed Engl 2013; 52:5762-6. [PMID: 23606345 PMCID: PMC3762872 DOI: 10.1002/anie.201210259] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Li-na Niu
- School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Kai Jiao
- School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Heonjune Ryou
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, Maryland, 21250 (USA)
| | - Cynthia K.Y. Yiu
- Prince Philip Dental Hospital, The University of Hong Kong, Hong Kong SAR (PR China)
| | - Ji-hua Chen
- School of Stomatology, Fourth Military Medical University, Xi’an, China
| | | | - Dwayne D. Arola
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, Maryland, 21250 (USA)
| | - David H. Pashley
- School of Graduate Studies, Georgia Health Sciences University, Augusta, Georgia, 30912-1129 (USA)
| | - Franklin R. Tay
- School of Graduate Studies, Georgia Health Sciences University, Augusta, Georgia, 30912-1129 (USA)
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Niu LN, Jiao K, Ryou H, Yiu CKY, Chen JH, Breschi L, Arola DD, Pashley DH, Tay FR. Multiphase Intrafibrillar Mineralization of Collagen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201210259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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37
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Gunawidjaja PN, Mathew R, Lo AYH, Izquierdo-Barba I, García A, Arcos D, Mattias Edén MVR. Local structures of mesoporous bioactive glasses and their surface alterations in vitro: inferences from solid-state nuclear magnetic resonance. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:1376-1399. [PMID: 22349247 PMCID: PMC3270387 DOI: 10.1098/rsta.2011.0257] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We review the benefits of using (29)Si and (1)H magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy for probing the local structures of both bulk and surface portions of mesoporous bioactive glasses (MBGs) of the CaO-SiO(2)-(P(2)O(5)) system. These mesoporous materials exhibit an ordered pore arrangement, and are promising candidates for improved bone and tooth implants. We discuss experimental MAS NMR results from three MBGs displaying different Ca, Si and P contents: the (29)Si NMR spectra were recorded either directly by employing radio-frequency pulses to (29)Si, or by magnetization transfers from neighbouring protons using cross polarization, thereby providing quantitative information about the silicate speciation present in the pore wall and at the MBG surface, respectively. The surface modifications were monitored for the three MBGs during their immersion in a simulated body fluid (SBF) for intervals between 30 min and one week. The results were formulated as a reaction sequence describing the interconversions between the distinct silicate species. We generally observed a depletion of Ca(2+) ions at the MBG surface, and a minor condensation of the silicate-surface network over one week of SBF soaking.
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Affiliation(s)
- Philips N. Gunawidjaja
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden
| | - Renny Mathew
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden
| | - Andy Y. H. Lo
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden
| | - Isabel Izquierdo-Barba
- Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Ana García
- Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Daniel Arcos
- Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - María Vallet-Regí Mattias Edén
- Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden
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Gunawidjaja PN, Izquierdo-Barba I, Mathew R, Jansson K, García A, Grins J, Arcos D, Vallet-Regí M, Edén M. Quantifying apatite formation and cation leaching from mesoporous bioactive glasses in vitro: a SEM, solid-state NMR and powder XRD study. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15066b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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