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Farlay D, Falgayrac G, Ponçon C, Rizzo S, Cortet B, Chapurlat R, Penel G, Badoud I, Ammann P, Boivin G. Material and nanomechanical properties of bone structural units of cortical and trabecular iliac bone tissues from untreated postmenopausal osteoporotic women. Bone Rep 2022; 17:101623. [PMID: 36213624 PMCID: PMC9535279 DOI: 10.1016/j.bonr.2022.101623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/23/2022] [Accepted: 09/26/2022] [Indexed: 11/24/2022] Open
Abstract
The differences in bone nanomechanical properties between cortical (Ct) and trabecular (Tb) bone remain uncertain, whereas knowing the respective contribution of each compartment is critical to understand the origin of bone strength. Our purpose was to compare bone mechanical and intrinsic properties of Ct and Tb compartments, at the bone structural unit (BSU) level, in iliac bone taken from a homogeneous untreated human population. Among 60 PMMA-embedded transiliac bone biopsies from untreated postmenopausal osteoporotic women (64 ± 7 year-old), >2000 BSUs were analysed by nanoindentation in physiological wet conditions [indentation modulus (elasticity), hardness, dissipated energy], by Fourier transform infrared (FTIRM) and Raman microspectroscopy (mineral and organic characteristics), and by X-ray microradiography (degree of mineralization of bone, DMB). BSUs were categorized based on tissue age, osteonal (Ost) and interstitial (Int) tissues location and bone compartments (Ct and Tb). Indentation modulus was higher in Ct than in Tb BSUs, both in Ost and Int. dissipated energy was higher in Ct than Tb, in Int BSUs. Hardness was not different between Ct and Tb BSUs. In Ost or Int BSUs, mineral maturity (conversion of non-apatitic into apatitic phosphates) was higher in Ct than in Tb, as well as for collagen maturity (Ost). Mineral content assessed as mineral/matrix (FTIRM and Raman) or as DMB, was lower in Ct than in Tb. Crystallinity (FTIRM) was similar in BSUs from Ct and Tb, and slightly lower in Ct than in Tb when measured by Raman, indicating that the crystal size/perfection was quite similar between Ct and Tb BSUs. The differences found between Ost and Int tissues were much higher than the difference found between Ct and Tb for all those bone material properties. Multiple regression analysis showed that Indentation modulus and dissipated energy were mainly explained by mineral maturity in Ct and by collagen maturity in Tb, and hardness by mineral content in both Ct and Tb. In conclusion, in untreated human iliac bone, Ct and Tb BSUs exhibit different characteristics. Ct BSUs have higher indentation modulus, dissipated energy (Int), mineral and organic maturities than Tb BSUs, without difference in hardness. Although those differences are relatively small compared to those found between Ost and Int BSUs, they may influence bone strength at macroscale.
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2
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Falgayrac G, Vitale R, Delannoy Y, Behal H, Penel G, Duponchel L, Colard T. Critical aspects of Raman spectroscopy as a tool for postmortem interval estimation. Talanta 2022; 249:123589. [PMID: 35691126 DOI: 10.1016/j.talanta.2022.123589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 01/28/2023]
Abstract
The estimation of the postmortem interval (PMI) from skeletal remains represents a challenging task in forensic science. PMI is often influenced by extrinsic factors (humidity, dryness, scavengers, etc.) and intrinsic factors (age, sex, pathology, way of life, medical treatments, etc.). Raman spectroscopy combined with multivariate data analysis represents a promising tool for forensic anthropologists. Despite all the advantages of the technique, Raman spectra of skeletal remains are influenced by these extrinsic and intrinsic factors, which impairs precision and reproducibility. Both parameters have to reach a high level of confidence when such spectroscopy is used as a way to predict PMI. As a consequence, advanced multivariate data analysis is necessary to quantify the effect of all factors to improve the estimation of the PMI. The objective of this work is to evaluate the effect of intrinsic and extrinsic factors on the Raman spectra of skeletal remains. We designed a protocol close to a real-world scenario. We used ANOVA-simultaneous component analysis (ASCA) to unmix and quantify the effect of 1 intrinsic (source body) and 1 extrinsic (burial time) factors on the Raman spectra. In our model, the burial time was found to generate the highest variability after the source body. ASCA showed that the variability due to the burial time has 2 mixed contributions. Seasonal variations are the first contribution. The second contribution is attributed to diagenesis. A decrease in the mineral bands and an increase in the organic bands are observed. The source body was also found to contribute to the variability in Raman spectra. ASCA showed that the source body induces variability related to the composition of bones. This quantification cannot be assessed by basic chemometrics methods such as PCA. The results of this study highlighted the need to use an advanced chemometric data analysis tool (like ASCA) combined with Raman spectroscopy to estimate the postmortem interval.
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Affiliation(s)
- Guillaume Falgayrac
- Univ. Lille, CHU Lille, Univ. Littoral Côte D'Opale, ULR 4490, MABLab- Adiposité Médullaire et Os, F-59000, Lille, France.
| | - Raffaele Vitale
- Univ. Lille, CNRS, UMR 8516, LASIRE, Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement, F-59000, Lille, France
| | - Yann Delannoy
- Univ. Lille, CHU Lille, Univ. Littoral Côte D'Opale, ULR 4490, MABLab- Adiposité Médullaire et Os, F-59000, Lille, France; Univ. Lille, CHU Lille, ULR 7367 - UTML&A - Unité de Taphonomie Médico-Légale & d'Anatomie, F-59000, Lille, France
| | - Hélène Behal
- Univ. Lille, CHU Lille, ULR 2694, METRICS: Évaluation des technologies de santé et des pratiques médicales, F-59000, Lille, France
| | - Guillaume Penel
- Univ. Lille, CHU Lille, Univ. Littoral Côte D'Opale, ULR 4490, MABLab- Adiposité Médullaire et Os, F-59000, Lille, France
| | - Ludovic Duponchel
- Univ. Lille, CNRS, UMR 8516, LASIRE, Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement, F-59000, Lille, France
| | - Thomas Colard
- Univ. Bordeaux, CNRS, MCC, PACEA, UMR 5199, F-33600, Pessac, France; Department of Oral Radiology, University of Lille, Lille University Hospital, F-59000, Lille, France
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3
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Tratwal J, Falgayrac G, During A, Bertheaume N, Bataclan C, Tavakol DN, Campos V, Duponchel L, Daley GQ, Penel G, Chauveau C, Naveiras O. Raman microspectroscopy reveals unsaturation heterogeneity at the lipid droplet level and validates an in vitro model of bone marrow adipocyte subtypes. Front Endocrinol (Lausanne) 2022; 13:1001210. [PMID: 36506047 PMCID: PMC9727239 DOI: 10.3389/fendo.2022.1001210] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 10/04/2022] [Indexed: 11/24/2022] Open
Abstract
Bone marrow adipocytes (BMAds) constitute the most abundant stromal component of adult human bone marrow. Two subtypes of BMAds have been described, the more labile regulated adipocytes (rBMAds) and the more stable constitutive adipocytes (cBMAds), which develop earlier in life and are more resilient to environmental and metabolic disruptions. In vivo, rBMAds are enriched in saturated fatty acids, contain smaller lipid droplets (LDs) and more readily provide hematopoietic support than their cBMAd counterparts. Mouse models have been used for BMAds research, but isolation of primary BMAds presents many challenges, and thus in vitro models remain the current standard to study nuances of adipocyte differentiation. No in vitro model has yet been described for the study of rBMAds/cBMAds. Here, we present an in vitro model of BM adipogenesis with differential rBMAd and cBMAd-like characteristics. We used OP9 BM stromal cells derived from a (C57BL/6xC3H)F2-op/op mouse, which have been extensively characterized as feeder layer for hematopoiesis research. We observed similar canonical adipogenesis transcriptional signatures for spontaneously-differentiated (sOP9) and induced (iOP9) cultures, while fatty acid composition and desaturase expression of Scd1 and Fads2 differed at the population level. To resolve differences at the single adipocyte level we tested Raman microspectroscopy and show it constitutes a high-resolution method for studying adipogenesis in vitro in a label-free manner, with resolution to individual LDs. We found sOP9 adipocytes have lower unsaturation ratios, smaller LDs and higher hematopoietic support than iOP9 adipocytes, thus functionally resembling rBMAds, while iOP9 more closely resembled cBMAds. Validation in human primary samples confirmed a higher unsaturation ratio for lipids extracted from stable cBMAd-rich sites (femoral head upon hip-replacement surgery) versus labile rBMAds (iliac crest after chemotherapy). As a result, the 16:1/16:0 fatty acid unsaturation ratio, which was already shown to discriminate BMAd subtypes in rabbit and rat marrow, was validated to discriminate cBMAds from rBMAd in both the OP9 model in vitro system and in human samples. We expect our model will be useful for cBMAd and rBMAd studies, particularly where isolation of primary BMAds is a limiting step.
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Affiliation(s)
- Josefine Tratwal
- Laboratory of Regenerative Hematopoiesis, Ecole Polytechnique Fédérale de Lausanne (EPFL) & Department of Biomedical Sciences, University of Lausanne (UNIL), Lausanne, Switzerland
| | - Guillaume Falgayrac
- Univ. Lille, CHU Lille, Univ. Littoral Côte d’Opale, ULR 4490 - MABLab- Marrow Adiposity Laboratory, Lille, France
| | - Alexandrine During
- Univ. Lille, CHU Lille, Univ. Littoral Côte d’Opale, ULR 4490 - MABLab- Marrow Adiposity Laboratory, Lille, France
| | - Nicolas Bertheaume
- Univ. Lille, CHU Lille, Univ. Littoral Côte d’Opale, ULR 4490 - MABLab- Marrow Adiposity Laboratory, Lille, France
| | - Charles Bataclan
- Laboratory of Regenerative Hematopoiesis, Ecole Polytechnique Fédérale de Lausanne (EPFL) & Department of Biomedical Sciences, University of Lausanne (UNIL), Lausanne, Switzerland
| | - Daniel N. Tavakol
- Laboratory of Regenerative Hematopoiesis, Ecole Polytechnique Fédérale de Lausanne (EPFL) & Department of Biomedical Sciences, University of Lausanne (UNIL), Lausanne, Switzerland
| | - Vasco Campos
- Laboratory of Regenerative Hematopoiesis, Ecole Polytechnique Fédérale de Lausanne (EPFL) & Department of Biomedical Sciences, University of Lausanne (UNIL), Lausanne, Switzerland
| | - Ludovic Duponchel
- Univ. Lille, CNRS, UMR 8516 - LASIRe - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l’Environnement, Lille, France
| | - George Q. Daley
- Division of Hematology/Oncology, Boston Children’s Hospital and Dana Farber Cancer Institute, Boston, Boston, MA, United States
| | - Guillaume Penel
- Univ. Lille, CHU Lille, Univ. Littoral Côte d’Opale, ULR 4490 - MABLab- Marrow Adiposity Laboratory, Lille, France
| | - Christophe Chauveau
- Univ. Lille, CHU Lille, Univ. Littoral Côte d’Opale, ULR 4490 - MABLab- Marrow Adiposity Laboratory, Lille, France
| | - Olaia Naveiras
- Laboratory of Regenerative Hematopoiesis, Ecole Polytechnique Fédérale de Lausanne (EPFL) & Department of Biomedical Sciences, University of Lausanne (UNIL), Lausanne, Switzerland
- Service of Hematology, Department of Oncology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
- Service of Hematology, Department of Laboratory Medicine Oncology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
- *Correspondence: Olaia Naveiras,
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4
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Guo S, Beleites C, Neugebauer U, Abalde-Cela S, Afseth NK, Alsamad F, Anand S, Araujo-Andrade C, Aškrabić S, Avci E, Baia M, Baranska M, Baria E, Batista de Carvalho LAE, de Bettignies P, Bonifacio A, Bonnier F, Brauchle EM, Byrne HJ, Chourpa I, Cicchi R, Cuisinier F, Culha M, Dahms M, David C, Duponchel L, Duraipandian S, El-Mashtoly SF, Ellis DI, Eppe G, Falgayrac G, Gamulin O, Gardner B, Gardner P, Gerwert K, Giamarellos-Bourboulis EJ, Gizurarson S, Gnyba M, Goodacre R, Grysan P, Guntinas-Lichius O, Helgadottir H, Grošev VM, Kendall C, Kiselev R, Kölbach M, Krafft C, Krishnamoorthy S, Kubryck P, Lendl B, Loza-Alvarez P, Lyng FM, Machill S, Malherbe C, Marro M, Marques MPM, Matuszyk E, Morasso CF, Moreau M, Muhamadali H, Mussi V, Notingher I, Pacia MZ, Pavone FS, Penel G, Petersen D, Piot O, Rau JV, Richter M, Rybarczyk MK, Salehi H, Schenke-Layland K, Schlücker S, Schosserer M, Schütze K, Sergo V, Sinjab F, Smulko J, Sockalingum GD, Stiebing C, Stone N, Untereiner V, Vanna R, Wieland K, Popp J, Bocklitz T. Comparability of Raman Spectroscopic Configurations: A Large Scale Cross-Laboratory Study. Anal Chem 2020; 92:15745-15756. [PMID: 33225709 DOI: 10.1021/acs.analchem.0c02696] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The variable configuration of Raman spectroscopic platforms is one of the major obstacles in establishing Raman spectroscopy as a valuable physicochemical method within real-world scenarios such as clinical diagnostics. For such real world applications like diagnostic classification, the models should ideally be usable to predict data from different setups. Whether it is done by training a rugged model with data from many setups or by a primary-replica strategy where models are developed on a 'primary' setup and the test data are generated on 'replicate' setups, this is only possible if the Raman spectra from different setups are consistent, reproducible, and comparable. However, Raman spectra can be highly sensitive to the measurement conditions, and they change from setup to setup even if the same samples are measured. Although increasingly recognized as an issue, the dependence of the Raman spectra on the instrumental configuration is far from being fully understood and great effort is needed to address the resulting spectral variations and to correct for them. To make the severity of the situation clear, we present a round robin experiment investigating the comparability of 35 Raman spectroscopic devices with different configurations in 15 institutes within seven European countries from the COST (European Cooperation in Science and Technology) action Raman4clinics. The experiment was developed in a fashion that allows various instrumental configurations ranging from highly confocal setups to fibre-optic based systems with different excitation wavelengths. We illustrate the spectral variations caused by the instrumental configurations from the perspectives of peak shifts, intensity variations, peak widths, and noise levels. We conclude this contribution with recommendations that may help to improve the inter-laboratory studies.
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Affiliation(s)
- Shuxia Guo
- Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.,Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany
| | - Claudia Beleites
- Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany.,Chemometrix GmbH, Södeler Weg 19, 61200 Wölfersheim, Germany
| | - Ute Neugebauer
- Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.,Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany.,Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, D-07747 Jena, Germany
| | - Sara Abalde-Cela
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Nils Kristian Afseth
- Nofima - Norwegian Institute of Food, Fisheries and Aquaculture Research, NO-9291 Tromsø, Norway
| | - Fatima Alsamad
- Université de Reims Champagne-Ardenne, 51 rue Cognacq-Jay, BioSpecT-EA 7506, Reims, 51097 CEDEX, France
| | - Suresh Anand
- National Institute of Optics, National Research Council, 50019 Sesto Fiorentino, Italy
| | - Cuauhtemoc Araujo-Andrade
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Sonja Aškrabić
- Institute of Physics Belgrade, University of Belgrade, Studentski trg 1, Beograd, Serbia
| | - Ertug Avci
- Genetics and Bioengineering Department, Faculty of Engineering, Yeditepe University, Kayisdagi, 34755 Ataşehir/İstanbul, Turkey
| | - Monica Baia
- Faculty of Physics, Babes-Bolyai University, Strada Mihail Kogǎlniceanu 1, Cluj-Napoca 400084, Romania
| | - Malgorzata Baranska
- Faculty of Chemistry, Jagiellonian University, 2 Gronostajowa Str., 30-387 Krakow Poland.,Jagiellonian Centre for Experimental Therapeutics (JCET), Michal̷a Bobrzyńskiego 14, 30-348 Kraków, Poland
| | - Enrico Baria
- Department of Physics, University of Florence, Piazza di San Marco, 4, 50121 Firenze FIorence, Italy.,European Laboratory for Non-linear Spectroscopy, Via Nello Carrara, 1, 50019 Sesto Fiorentino FIorence, Italy
| | - Luis A E Batista de Carvalho
- Molecular Physical Chemistry R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | | | - Alois Bonifacio
- Raman Lab, Dept. Engineering and Architecture, University of Trieste, Via Alfonso Valerio, 6/1, 34127 Trieste, Italy
| | - Franck Bonnier
- Faculty of pharmacy, EA6295 NanoMédicaments et Nanosondes, University of Tours, 60 Rue du Plat d'Étain, 37000 Tours, France
| | - Eva Maria Brauchle
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstraße 55, 72770 Reutlingen, Germany.,Department of Women's Health, Research Institute of Women's Health, Eberhard Karls University Tübingen, Geschwister-Scholl-Platz, 72074 Tübingen, Germany.,Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Hugh J Byrne
- FOCAS Research Institute, Technological University Dublin, City Campus, Aungier St, Dublin, Ireland
| | - Igor Chourpa
- Faculty of pharmacy, EA6295 NanoMédicaments et Nanosondes, University of Tours, 60 Rue du Plat d'Étain, 37000 Tours, France
| | - Riccardo Cicchi
- National Institute of Optics, National Research Council, 50019 Sesto Fiorentino, Italy.,European Laboratory for Non-linear Spectroscopy, Via Nello Carrara, 1, 50019 Sesto Fiorentino FIorence, Italy
| | - Frederic Cuisinier
- LBN, University Montpellier, 641 Av. du Doyen Gaston Giraud, 34000 Montpellier, France
| | - Mustafa Culha
- Genetics and Bioengineering Department, Faculty of Engineering, Yeditepe University, Kayisdagi, 34755 Ataşehir/İstanbul, Turkey
| | - Marcel Dahms
- Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.,Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany.,Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, D-07747 Jena, Germany
| | - Catalina David
- HORIBA France SAS, 231 Rue de Lille, 59650 Villeneuve-d'Ascq, France
| | - Ludovic Duponchel
- LASIRE - LAboratoire de Spectroscopie pour les Interactions, la Réactivité et l'Environnement, Univ. Lille, CNRS, UMR 8516 - F-59000 Lille, France
| | - Shiyamala Duraipandian
- FOCAS Research Institute, Technological University Dublin, City Campus, Aungier St, Dublin, Ireland.,School of Physics & Clinical & Optometric Sciences, Technological University Dublin, City Campus, Kevin Street, Dublin 2, D08 X622, Ireland
| | - Samir F El-Mashtoly
- Center for Protein Diagnostics (ProDi), Ruhr University Bochum, Gesundheitscampus 4, 44801 Bochum, Germany.,Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - David I Ellis
- Manchester Institute of Biotechnology, School of Chemistry, University of Manchester, M1 7DN, Manchester, United Kingdom
| | - Gauthier Eppe
- Mass Spectrometry Laboratory, MolSys Research Unit, University of Liege, Place du 20 Aoǔt 7, 4000 Liège, Belgium
| | - Guillaume Falgayrac
- MABLab, Marrow Adiposity and Bone Lab, Univ. Littoral Côte d'Opale, F-62300 Boulogne-sur-Mer, France.,CHU Lille, 2 Avenue Oscar Lambret, F-59000 Lille, France
| | - Ozren Gamulin
- Department of Physics and Biophysics, School of Medicine, University of Zagreb, Šalata 3, 10000 Zagreb, Croatia.,Centre for Advanced Materials Science, Bijenička 54, 10000 Zagreb, Croatia
| | - Benjamin Gardner
- Physics and Astronomy, Mathematics and Physical Sciences, College of Engineering, Exeter, EX4 4Q, United Kingdom
| | - Peter Gardner
- Manchester Institute of Biotechnology, School of Chemistry, University of Manchester, M1 7DN, Manchester, United Kingdom.,Department of Chemical Engineering and Analytical Science, School of Engineering, The University of Manchester, Manchester M1 3AL United Kingdom
| | - Klaus Gerwert
- Center for Protein Diagnostics (ProDi), Ruhr University Bochum, Gesundheitscampus 4, 44801 Bochum, Germany.,Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | | | | | - Marcin Gnyba
- Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Royston Goodacre
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 750 7ZB, United Kingdom
| | - Patrick Grysan
- Materials Research and Technology, Luxembourg Institute of Science and Technology, 41, rue du Brill, L-4422 Belvaux, Luxembourg
| | | | - Helga Helgadottir
- Faculty of Pharmaceutical Sciences, University of Iceland, Reykjavik, Iceland
| | - Vlasta Mohaček Grošev
- Centre for Advanced Materials Science, Bijenička 54, 10000 Zagreb, Croatia.,Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Catherine Kendall
- Biophotonics Research Unit, Gloucestershire Hospitals NHS Foundation Trust, Leadon House, Great Western Rd, Gloucester GL1 3NN, United Kingdom
| | - Roman Kiselev
- Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany.,St. Jude Children's Research Hospital, 262 Danny Thomas Pl, Memphis, Tennessee 38105, United States
| | - Micha Kölbach
- Renishaw GmbH, Karl-Benz-Straße 12, 72124 Pliezhausen Germany
| | - Christoph Krafft
- Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany
| | - Sivashankar Krishnamoorthy
- Materials Research and Technology, Luxembourg Institute of Science and Technology, 41, rue du Brill, L-4422 Belvaux, Luxembourg
| | - Patrick Kubryck
- Renishaw GmbH, Karl-Benz-Straße 12, 72124 Pliezhausen Germany
| | - Bernhard Lendl
- Institute of Chemical Technologies and Analytics, TU Wien, 1040 Wien, Austria
| | - Pablo Loza-Alvarez
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Fiona M Lyng
- FOCAS Research Institute, Technological University Dublin, City Campus, Aungier St, Dublin, Ireland.,School of Physics & Clinical & Optometric Sciences, Technological University Dublin, City Campus, Kevin Street, Dublin 2, D08 X622, Ireland
| | - Susanne Machill
- Chair of Bioanalytical Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Cedric Malherbe
- Mass Spectrometry Laboratory, MolSys Research Unit, University of Liege, Place du 20 Aoǔt 7, 4000 Liège, Belgium
| | - Monica Marro
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Maria Paula M Marques
- Molecular Physical Chemistry R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.,Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal
| | - Ewelina Matuszyk
- Jagiellonian Centre for Experimental Therapeutics (JCET), Michal̷a Bobrzyńskiego 14, 30-348 Kraków, Poland
| | | | - Myriam Moreau
- LASIRE - LAboratoire de Spectroscopie pour les Interactions, la Réactivité et l'Environnement, Univ. Lille, CNRS, UMR 8516 - F-59000 Lille, France
| | - Howbeer Muhamadali
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 750 7ZB, United Kingdom
| | - Valentina Mussi
- National Research Council, Institute for Microelectronics and Microsystems (IMM-CNR), Via del Fosso del Cavaliere, 100, 00133 Roma RM Rome, Italy
| | - Ioan Notingher
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Marta Z Pacia
- Jagiellonian Centre for Experimental Therapeutics (JCET), Michal̷a Bobrzyńskiego 14, 30-348 Kraków, Poland
| | - Francesco S Pavone
- Department of Physics, University of Florence, Piazza di San Marco, 4, 50121 Firenze FIorence, Italy.,European Laboratory for Non-linear Spectroscopy, Via Nello Carrara, 1, 50019 Sesto Fiorentino FIorence, Italy
| | - Guillaume Penel
- MABLab, Marrow Adiposity and Bone Lab, Univ. Littoral Côte d'Opale, F-62300 Boulogne-sur-Mer, France.,CHU Lille, 2 Avenue Oscar Lambret, F-59000 Lille, France
| | - Dennis Petersen
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Olivier Piot
- Université de Reims Champagne-Ardenne, 51 rue Cognacq-Jay, BioSpecT-EA 7506, Reims, 51097 CEDEX, France.,Université de Reims Champagne-Ardenne, PICT, 9 Boulevard de la Paix, 51097 Reims, France
| | - Julietta V Rau
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche (ISM-CNR), Via del Fosso del Cavaliere, 100-00133 Rome, Italy.,Sechenov First Moscow State Medical University, 119991 Moscow, Trubetskaya 8, build. 2, Russian Federation
| | - Marc Richter
- Renishaw GmbH, Karl-Benz-Straße 12, 72124 Pliezhausen Germany
| | | | - Hamideh Salehi
- LBN, University Montpellier, 641 Av. du Doyen Gaston Giraud, 34000 Montpellier, France
| | - Katja Schenke-Layland
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstraße 55, 72770 Reutlingen, Germany.,Department of Women's Health, Research Institute of Women's Health, Eberhard Karls University Tübingen, Geschwister-Scholl-Platz, 72074 Tübingen, Germany.,Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Sebastian Schlücker
- Faculty of Chemistry, University of Duisburg-Essen, Universitaetsstr. 5, 45141 Essen, Germany
| | - Markus Schosserer
- Department of Biotechnology, Institute of Molecular Biotechnology, University of Natural Resources and Life Sciences, Gregor-Mendel-Straße 33, 1180 Vienna, Austria
| | | | - Valter Sergo
- Raman Lab, Dept. Engineering and Architecture, University of Trieste, Via Alfonso Valerio, 6/1, 34127 Trieste, Italy.,Faculty of Health Sciences, University of Macau, 999078 Macau, SAR China
| | - Faris Sinjab
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Janusz Smulko
- Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Ganesh D Sockalingum
- Université de Reims Champagne-Ardenne, 51 rue Cognacq-Jay, BioSpecT-EA 7506, Reims, 51097 CEDEX, France.,Université de Reims Champagne-Ardenne, PICT, 9 Boulevard de la Paix, 51097 Reims, France
| | - Clara Stiebing
- Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany
| | - Nick Stone
- Physics and Astronomy, Mathematics and Physical Sciences, College of Engineering, Exeter, EX4 4Q, United Kingdom
| | - Valérie Untereiner
- Université de Reims Champagne-Ardenne, PICT, 9 Boulevard de la Paix, 51097 Reims, France
| | - Renzo Vanna
- Istituti Clinici Scientifici Maugeri IRCCS, Via Salvatore Maugeri, 10, 27100 Pavia, Italy
| | - Karin Wieland
- Institute of Chemical Technologies and Analytics, TU Wien, 1040 Wien, Austria
| | - Jürgen Popp
- Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.,Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany
| | - Thomas Bocklitz
- Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.,Member of Leibniz Health Technologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany
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5
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Coutel X, Falgayrac G, Penel G, Olejnik C. Short-term high-dose zoledronic acid enhances crystallinity in mandibular alveolar bone in rats. Eur J Oral Sci 2020; 128:284-291. [PMID: 32430956 DOI: 10.1111/eos.12702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/18/2020] [Indexed: 11/29/2022]
Abstract
Owing to its antiresorptive properties, zoledronic acid (ZOL) is commonly used in the management of benign as well as malignant bone diseases. This molecule targets sites where bone is actively remodeling, and high concentrations have been reported in the jaw. The purpose of this study was to investigate whether treatment of male rats with ZOL, at a dosage equivalent to that used for antitumor treatment, impacts the short-term qualitative properties of mandibular bone independent of bone remodeling. Thirty rats were randomly assigned to treatment either with ZOL or with serum-vehicle (control) (weekly injections: 100 μg kg-1 for 6 wk, n = 15 per group). Using the tetracycline double-labeling technique, remodeled bone areas, corresponding to the preferential site of bisphosphonate binding, were found in the alveolar bone along the alveolar bone proper. The composition of bone in these areas was characterized using Raman microspectroscopy and compared with adjacent, non-remodeled, older bone. The ZOL-treated group exhibited higher crystallinity in the remodeled bone areas (+2%), reflecting an early maturation of the apatite mineral after ZOL injection. Our findings highlight a direct and rapid effect of clinically relevant anti-tumoral ZOL doses on the qualitative properties of mandibular bone, especially on mineral crystallinity in the vicinity of the teeth, namely, the alveolar bone proper.
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Affiliation(s)
- Xavier Coutel
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, ULR 4490 - MABLab - Marrow Adiposity and Bone Lab,, F-59000 Lille, France
| | - Guillaume Falgayrac
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, ULR 4490 - MABLab - Marrow Adiposity and Bone Lab,, F-59000 Lille, France
| | - Guillaume Penel
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, ULR 4490 - MABLab - Marrow Adiposity and Bone Lab,, F-59000 Lille, France
| | - Cécile Olejnik
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, ULR 4490 - MABLab - Marrow Adiposity and Bone Lab,, F-59000 Lille, France
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6
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During A, Coutel X, Bertheaume N, Penel G, Olejnik C. Long Term Ovariectomy-Induced Osteoporosis is Associated with High Stearoyl-CoA Desaturase Indexes in Rat Femur. Calcif Tissue Int 2020; 106:315-324. [PMID: 31796982 DOI: 10.1007/s00223-019-00637-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 11/20/2019] [Indexed: 02/07/2023]
Abstract
Osteoporosis is characterized by a bone loss associated to an increased bone marrow adiposity; however, it is still unclear what kind of lipids are involved. Therefore, the main purpose of this study was to see if there is any local bone lipid changes related to osteoporosis, by using the ovariectomy-induced osteoporosis (OVX) rat model. Female SD rats (operated at 6 months of age for skeletal maturity) were divided in control SHAM and OVX groups (n = 6/group) and maintained for 9 month post-surgery. Lipids were analyzed in two compartments of femoral diaphyses: bone marrow (BM) and mineralized tissue (MT), by chromatographic methods. As expected, osteoporotic femurs had a larger BM mass associated with a two-fold increase of lipid content. The MT had a similar lipid enrichment, indicating that adiposity affected the mineral part as well. The main lipids concerned were triglycerides, sphingomyelin, phosphatidylcholine and phosphatidylserine in BM, and triglycerides and cholesterol esters in MT. The increase of both energy-storage and membrane-associated lipids in BM suggested that cell number and/or size was enhanced to allow more triglyceride storage. Interestingly, in MT of osteoporotic femurs, sphingomyelin was decreased, suggesting that its catabolism could be linked to osteoporosis. In both femoral compartments, fatty acid profiles were enriched in 14:0 and 16:1, lowered in 18:0 and 20:4 n-6, and two-fold higher stearoyl-CoA desaturase indexes (16:1/16:0 and 18:1/18:0 ratios), suggesting an increased de novo lipogenesis in osteoporotic femurs. Thus, the present study is first to report local changes of individual lipids in rat osteoporotic femurs and suggests that osteoporosis is a pathologic condition associated with an enhanced de novo lipogenesis. Further studies will be needed to better understand the consequences of these lipid changes in osteoporotic bones.
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Affiliation(s)
- Alexandrine During
- Univ. Lille, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France.
- Laboratory PMOI, Faculté de Chirurgie Dentaire, Place de Verdun, 59000, Lille, France.
| | - Xavier Coutel
- Univ. Lille, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
| | - Nicolas Bertheaume
- Univ. Lille, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
| | - Guillaume Penel
- Univ. Lille, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
| | - Cécile Olejnik
- Univ. Lille, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
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7
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Fornasaro S, Alsamad F, Baia M, Batista de Carvalho LAE, Beleites C, Byrne HJ, Chiadò A, Chis M, Chisanga M, Daniel A, Dybas J, Eppe G, Falgayrac G, Faulds K, Gebavi H, Giorgis F, Goodacre R, Graham D, La Manna P, Laing S, Litti L, Lyng FM, Malek K, Malherbe C, Marques MPM, Meneghetti M, Mitri E, Mohaček-Grošev V, Morasso C, Muhamadali H, Musto P, Novara C, Pannico M, Penel G, Piot O, Rindzevicius T, Rusu EA, Schmidt MS, Sergo V, Sockalingum GD, Untereiner V, Vanna R, Wiercigroch E, Bonifacio A. Surface Enhanced Raman Spectroscopy for Quantitative Analysis: Results of a Large-Scale European Multi-Instrument Interlaboratory Study. Anal Chem 2020; 92:4053-4064. [PMID: 32045217 PMCID: PMC7997108 DOI: 10.1021/acs.analchem.9b05658] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
![]()
Surface-enhanced
Raman scattering (SERS) is a powerful and sensitive
technique for the detection of fingerprint signals of molecules and
for the investigation of a series of surface chemical reactions. Many
studies introduced quantitative applications of SERS in various fields,
and several SERS methods have been implemented for each specific application,
ranging in performance characteristics, analytes used, instruments,
and analytical matrices. In general, very few methods have been validated
according to international guidelines. As a consequence, the application
of SERS in highly regulated environments is still considered risky,
and the perception of a poorly reproducible and insufficiently robust
analytical technique has persistently retarded its routine implementation.
Collaborative trials are a type of interlaboratory study (ILS) frequently
performed to ascertain the quality of a single analytical method.
The idea of an ILS of quantification with SERS arose within the framework
of Working Group 1 (WG1) of the EU COST Action BM1401 Raman4Clinics
in an effort to overcome the problematic perception of quantitative
SERS methods. Here, we report the first interlaboratory SERS study
ever conducted, involving 15 laboratories and 44 researchers. In this
study, we tried to define a methodology to assess the reproducibility
and trueness of a quantitative SERS method and to compare different
methods. In our opinion, this is a first important step toward a “standardization”
process of SERS protocols, not proposed by a single laboratory but
by a larger community.
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Affiliation(s)
- Stefano Fornasaro
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy
| | - Fatima Alsamad
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Monica Baia
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | - Luís A E Batista de Carvalho
- Molecular-Physical Chemistry R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | | | - Hugh J Byrne
- FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - Alessandro Chiadò
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Mihaela Chis
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | - Malama Chisanga
- School of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester, United Kingdom M1 7DN
| | - Amuthachelvi Daniel
- Radiation and Environmental Science Centre, FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - Jakub Dybas
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, ul. Gronostajowa 2, 30-384 Krakow, Poland
| | - Gauthier Eppe
- Mass Spectrometry Laboratory (MSLab), MolSys RU, University of Liège, Liège, Belgium
| | - Guillaume Falgayrac
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI, F-59000 Lille, France
| | - Karen Faulds
- Bionanotechnology Research Section, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, United Kingdom
| | - Hrvoje Gebavi
- Centre of Excellence for Advanced Materials and Sensing Devices, Division of Materials Physics, Rudjer Boskovic Institute, Bijenicka c. 54, 10000 Zagreb, Croatia
| | - Fabrizio Giorgis
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Royston Goodacre
- Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom, L69 7ZB
| | - Duncan Graham
- Bionanotechnology Research Section, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, United Kingdom
| | - Pietro La Manna
- Institute on Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei, 34, Pozzuoli, Naples 80078, Italy
| | - Stacey Laing
- Bionanotechnology Research Section, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, United Kingdom
| | - Lucio Litti
- Nanostructures and Optics Laboratory, Department of Chemical Sciences, University of Padova, Via Marzolo 1 - 35131, Padova, Italy
| | - Fiona M Lyng
- Radiation and Environmental Science Centre, FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland
| | - Kamilla Malek
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, ul. Gronostajowa 2, 30-384 Krakow, Poland
| | - Cedric Malherbe
- Mass Spectrometry Laboratory (MSLab), MolSys RU, University of Liège, Liège, Belgium
| | - Maria P M Marques
- Molecular-Physical Chemistry R&D Unit, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.,Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal
| | - Moreno Meneghetti
- Nanostructures and Optics Laboratory, Department of Chemical Sciences, University of Padova, Via Marzolo 1 - 35131, Padova, Italy
| | - Elisa Mitri
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy
| | - Vlasta Mohaček-Grošev
- Centre of Excellence for Advanced Materials and Sensing Devices, Division of Materials Physics, Rudjer Boskovic Institute, Bijenicka c. 54, 10000 Zagreb, Croatia
| | - Carlo Morasso
- Nanomedicine and Molecular Imaging Lab, Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, 27100 Pavia, Italy
| | - Howbeer Muhamadali
- Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom, L69 7ZB
| | - Pellegrino Musto
- Institute on Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei, 34, Pozzuoli, Naples 80078, Italy
| | - Chiara Novara
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Marianna Pannico
- Institute on Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei, 34, Pozzuoli, Naples 80078, Italy
| | - Guillaume Penel
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI, F-59000 Lille, France
| | - Olivier Piot
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Tomas Rindzevicius
- Technical University of Denmark, Department of Health Technology, Ørsteds Plads, Building 345C, DK-2800 Kgs. Lyngby, Denmark
| | - Elena A Rusu
- Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
| | | | - Valter Sergo
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy.,Faculty of Health Sciences, University of Macau, SAR Macau, China
| | - Ganesh D Sockalingum
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Valérie Untereiner
- Université de Reims Champagne-Ardenne, BioSpecT-EA7506, UFR de Pharmacie, 51 rue Cognacq-Jay, 51097 Reims, France
| | - Renzo Vanna
- Nanomedicine and Molecular Imaging Lab, Istituti Clinici Scientifici Maugeri IRCCS, Via Maugeri 4, 27100 Pavia, Italy
| | - Ewelina Wiercigroch
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian University, ul. Gronostajowa 2, 30-384 Krakow, Poland
| | - Alois Bonifacio
- Raman Spectroscopy Lab, Department of Engineering and Architecture, University of Trieste, P.le Europa 1, 34100 Trieste, Italy
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8
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Pascart T, Paccou J, Colard T, Norberciak L, Girard J, Delattre J, Marchandise P, Legrand J, Penel G, Coursier R, Putman S, Cortet B, Kerckhofs G, Budzik JF. T1-weighted MRI images accurately represent the volume and surface of architectural mineral damage of osteonecrosis of the femoral head: Comparison with high-resolution computed tomography. Bone 2020; 130:115099. [PMID: 31654780 DOI: 10.1016/j.bone.2019.115099] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 09/30/2019] [Accepted: 10/02/2019] [Indexed: 11/24/2022]
Abstract
The potency of magnetic resonance imaging (MRI) to measure the exact extent of osteonecrosis of the femoral head (ONFH) remains uncertain. The objective of this study was to determine if the volume of necrosis assessed with MRI accurately reflects the volume of architectural mineral alterations in osteonecrosis of the femoral head by comparison with high-resolution microfocus X-ray computed tomography (HR-μCT). Fourteen male patients aged 53 years [46.2;59.0] suffering from ONFH were prospectively enrolled to undergo preoperative MRI and ex vivo analysis using HR-μCT. The necrotic zone on T1-weighted MRI scans was defined as total necrosis (delimited by the low-signal peripheral band) or dark necrosis (low-signal lesions only). The HR-μCT scans delimited outer necrosis and inner necrosis by including or excluding the sclerotic zone. The intra-class correlation coefficient (ICC) was calculated to compare the agreement of surface areas and volumes of necrosis measurements with the two techniques. There was an overall excellent agreement between MRI dark necrosis volume and HR-μCT outer necrosis volume (ICC=0.91[0.54;0.98]) while the MRI total necrosis volume showed poor agreement with both HR-μCT delimitations of necrosis volume. For surface area, agreement between MRI dark necrosis and HR-μCT delimitations was good for inner necrosis (ICC=0.70[0.21;0.9]) and moderate for outer necrosis (ICC=0.58[0.07;0.85]). This study demonstrates that measurement of the MRI lesions provides a reliable assessment of the extent of ONFH-related architectural damage.
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Affiliation(s)
- Tristan Pascart
- Department of Rheumatology, Lille Catholic Hospitals, University of Lille, F-59160, Lomme, France; EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France.
| | - Julien Paccou
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France; Department of Rheumatology, Hopital Salengro, Centre Hospitalier Universitaire de Lille, University of Lille, F-59000, Lille, France
| | - Thomas Colard
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France
| | - Laurène Norberciak
- Department of Medical Research, Biostatistics, Lille Catholic Hospitals, University of Lille, F-59160, Lomme, France
| | - Julien Girard
- Department of Orthopaedic Surgery, Hopital Salengro, Centre Hospitalier Universitaire de Lille, F-59037, Lille, France
| | - Jerôme Delattre
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France
| | - Pierre Marchandise
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France
| | - Julie Legrand
- Department of Radiology, Lille Catholic Hospitals, University of Lille, F-59160, Lomme, France
| | - Guillaume Penel
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France
| | - Raphaël Coursier
- Department of Orthopaedic Surgery, Lille Catholic Hospitals, University of Lille, F-59160 Lomme, France
| | - Sophie Putman
- Department of Orthopaedic Surgery, Hopital Salengro, Centre Hospitalier Universitaire de Lille, F-59037, Lille, France
| | - Bernard Cortet
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France; Department of Rheumatology, Hopital Salengro, Centre Hospitalier Universitaire de Lille, University of Lille, F-59000, Lille, France
| | - Greet Kerckhofs
- Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, Leuven, Belgium; Prometheus - Division of Skeletal Tissue Engineering Leuven, KU Leuven, Leuven, Belgium; Biomechanics lab, Institute of Mechanics, Materials, and Civil Engineering, UC Louvain, Louvain-la-Neuve, Belgium
| | - Jean-François Budzik
- EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, University of Lille, F-59000, Lille, France; Department of Radiology, Lille Catholic Hospitals, University of Lille, F-59160, Lomme, France
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9
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Coutel X, Delattre J, Marchandise P, Falgayrac G, Béhal H, Kerckhofs G, Penel G, Olejnik C. Mandibular bone is protected against microarchitectural alterations and bone marrow adipose conversion in ovariectomized rats. Bone 2019; 127:343-352. [PMID: 31276849 DOI: 10.1016/j.bone.2019.06.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 06/02/2019] [Accepted: 06/29/2019] [Indexed: 02/05/2023]
Abstract
Osteoporosis is a disease that leads to a loss of bone mass and to alterations in the bone microarchitecture that occur in a site-specific manner; however it remains controversial in the jaw. The involvement of bone marrow adipose tissue (BMAT) in the bone metabolism has been suggested in several physiopathological contexts, such as in aging and osteoporosis. To test whether the BMAT content is related to mandibular bone loss, this study aimed to investigate the potential correlations between the trabecular bone microarchitecture on one hand and BMAT content and its spatial distribution in relation to bone surface on the other hand during aging and ovariectomy (OVX) during a long-term follow-up in a mature rat model. No age-related microarchitectural or BMAT changes were observed in the mandible. The OVX-induced bone loss was three-fold lower in the mandible than in the tibia and was observed only in the alveolar bone (not in the condyle). We also report a delayed increase in the mandibular BMAT content that remained 4-6-fold lower compared to tibia. This low BMAT content in the mandible was located at a distance from the trabecular bone surface (only 5% in contact with the bone surface versus 87% in the tibia). These findings highlight a specific mandibular response to OVX, in particular fewer microarchitectural alterations compared to that in the tibia. For the latter, the trabecular bone thickness and surface were correlated with the BMAT content. Oral functions may have a protective effect on the mandibular BMAT conversion in an OVX context.
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Affiliation(s)
- Xavier Coutel
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, EA 4490 - PMOI, F-59000 Lille, France.
| | - Jérôme Delattre
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, EA 4490 - PMOI, F-59000 Lille, France
| | - Pierre Marchandise
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, EA 4490 - PMOI, F-59000 Lille, France
| | - Guillaume Falgayrac
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, EA 4490 - PMOI, F-59000 Lille, France
| | - Hélène Béhal
- Univ. Lille, CHU Lille, EA 2694 - Santé publique: épidémiologie et qualité des soins, Unité de Méthodologie et Biostatistiques, F-59000 Lille, France
| | - Greet Kerckhofs
- Biomechanics Lab, Institute of Mechanics, Materials, and Civil Engineering, UCLouvain, Louvain-la-Neuve, Belgium; Institute of Experimental and Clinical Research, UCLouvain, Woluwe, Belgium; Department Materials Engineering, KU Leuven, Leuven, Belgium; Prometheus, Division of Skeletal Tissue Engineering, KU Leuven, Leuven, Belgium
| | - Guillaume Penel
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, EA 4490 - PMOI, F-59000 Lille, France
| | - Cécile Olejnik
- Univ. Lille, Univ. Littoral Côte d'Opale, CHU Lille, EA 4490 - PMOI, F-59000 Lille, France
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10
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Penel G, Kerckhofs G, Chauveau C. Brief Report From the 4th International Meeting on Bone Marrow Adiposity (BMA2018). Front Endocrinol (Lausanne) 2019; 10:691. [PMID: 31681168 PMCID: PMC6813723 DOI: 10.3389/fendo.2019.00691] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 09/23/2019] [Indexed: 01/03/2023] Open
Abstract
The 4th International Meeting on Bone Marrow Adiposity (BMA2018) was hosted at the premises of the Regional Government of Hauts de France in Lille, from August 29th to August 31st 2018. This congress brought together physicians and scientists working on rheumatology and bone biology, oncology, hematology, endocrinology, and metabolic diseases, all interested in bone marrow adiposity. They shared their opinions, hypothesis, and original results. Six invited keynotes were given by S. Badr, B.C.J. van der Eerden, M.J. Moreno Aliaga, O. Naveiras, C.J. Rosen, and A.V. Schwartz. Twenty-one short talks were also given. This report briefly summarizes the scientific content of the meeting and the progress of the working groups of the BMA Society (http://bma-society.org/).
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Affiliation(s)
- Guillaume Penel
- Inflammatory Bone Diseases Lab, Univ. Littoral Côte d'Opale, Boulogne-Sur-Mer, and Univ. Lille, Lille, and CHU Lille, Lille, France
| | - Greet Kerckhofs
- Biomechanics Lab, Institute of Mechanics, Materials and Civil Engineering, UCLouvain, Louvain-la-Neuve, Belgium
- Department Materials Engineering, KU Leuven, Leuven, Belgium
| | - Christophe Chauveau
- Inflammatory Bone Diseases Lab, Univ. Littoral Côte d'Opale, Boulogne-Sur-Mer, and Univ. Lille, Lille, and CHU Lille, Lille, France
- *Correspondence: Christophe Chauveau
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11
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Abstract
There is growing interest in the relationship between bone marrow fat (BMF) and skeletal health. Progress in clinical studies of BMF and skeletal health has been greatly enhanced by recent technical advances in our ability to measure BMF non-invasively. Magnetic resonance imagery (MRI) with or without spectroscopy is currently the standard technique for evaluating BMF content and composition in humans. This review focuses on clinical studies of marrow fat and its relationship with bone. The amount of marrow fat is associated with bone mineral density (BMD). Several studies have reported a significant negative association between marrow fat content and BMD in both healthy and osteoporotic populations. There may also be a relationship between marrow fat and fracture (mostly vertebral fracture), but data are scarce and further studies are needed. Furthermore, a few studies suggest that a lower proportion of unsaturated lipids in vertebral BMF may be associated with reduced BMD and greater prevalence of fracture. Marrow fat might be influenced by metabolic diseases associated with bone loss and fractures, such as diabetes mellitus, obesity and anorexia nervosa. An intriguing aspect of bariatric (weight loss) surgery is that it induces bone loss and fractures, but with different impacts on marrow fat depending on diabetic status. In daily practice, the usefulness for clinicians of assessing marrow fat using MRI is still limited. However, the perspectives are exciting, particularly in terms of improving the diagnosis and management of osteoporosis. Further studies are needed to better understand the regulators involved in the marrow fat-bone relationship and the links between marrow fat, other fat depots and energy metabolism.
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Affiliation(s)
- Julien Paccou
- Université de Lille, Université Littoral Côte d'Opale, PMOI EA 4490 faculté de chirurgie dentaire, place de Verdun, 59000 Lille, France; Service de rhumatologie, CHRU, 59000 Lille, France.
| | - Guillaume Penel
- Université de Lille, Université Littoral Côte d'Opale, PMOI EA 4490 faculté de chirurgie dentaire, place de Verdun, 59000 Lille, France
| | - Christophe Chauveau
- Univ. Littoral Côte d'Opale, Univ. Lille, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-62300 Boulogne-sur-Mer, France
| | - Bernard Cortet
- Université de Lille, Université Littoral Côte d'Opale, PMOI EA 4490 faculté de chirurgie dentaire, place de Verdun, 59000 Lille, France; Service de rhumatologie, CHRU, 59000 Lille, France
| | - Pierre Hardouin
- Univ. Littoral Côte d'Opale, Univ. Lille, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-62300 Boulogne-sur-Mer, France
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12
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Coyac BR, Falgayrac G, Penel G, Schmitt A, Schinke T, Linglart A, McKee MD, Chaussain C, Bardet C. Impaired mineral quality in dentin in X-linked hypophosphatemia. Connect Tissue Res 2018; 59:91-96. [PMID: 29745817 DOI: 10.1080/03008207.2017.1417989] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
X-linked hypophosphatemia (XLH) is a skeletal disorder arising from mutations in the PHEX gene, transmitted in most cases as an X-linked dominant trait. PHEX deficiency leads to renal phosphate wasting and hypophosphatemia, as well as impaired mineralization of bone and dentin, resulting in severe skeletal and dental complications. Dentin mineralization defects appear as characteristic, large interglobular spaces resulting from the lack of fusion of calculospherites in the circumpulpal region during the mineralization process. Here, we examined changes in the composition and structure of dentin using Raman spectroscopy on XLH human teeth, and using transmission electron microscopy on the dentin of Hyp mice (the murine model of XLH). The dentin of patients with XLH showed changes in the quality of the apatitic mineral, with greater carbonate substitution and lower crystallinity compared to the dentin of age-matched control teeth. In addition, ultrastructural analysis by transmission electron microscopy revealed a major disorganization of the peri- and intertubular structure of the dentin, with odontoblast processes residing within an unmineralized matrix sheath in the Hyp mouse. Taken together, these results indicate that like for bone and tooth cementum, there are impaired mineral quality and matrix changes in XLH dentin reflecting high sensitivity to systemic serum phosphate levels and possibly other local changes in the dentin matrix.
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Affiliation(s)
- Benjamin R Coyac
- a Orofacial Pathologies, Imaging and Biotherapies Laboratory EA2496, Dental School , Paris Descartes University , Paris , France.,b Department of Periodontology, U.F.R. of Odontology , Rothschild Hospital, AP-HP, Paris Diderot University , Paris , France
| | - Guillaume Falgayrac
- c EA 4490-PMOI-Physiopathologie des Maladies Osseuses Inflammatoires , Univ. Lille, Univ. Littoral Côte d'Opale , Lille , France
| | - Guillaume Penel
- c EA 4490-PMOI-Physiopathologie des Maladies Osseuses Inflammatoires , Univ. Lille, Univ. Littoral Côte d'Opale , Lille , France
| | - Alain Schmitt
- d Cochin Institute, Transmission Electron Microscopy Platform, INSERM U1016, CNRS UMR8104 , Paris Descartes University Sorbonne Paris Cité , Paris , France
| | - Thorsten Schinke
- e Department of Osteology and Biomechanics , University Medical Center Hamburg-Eppendorf , Hamburg , Germany
| | - Agnès Linglart
- f APHP, Reference Center for Rare Disorders of Calcium and Phosphate Metabolism , Plateforme d'Expertise Paris Sud Maladies Rares and Filière OSCAR , Le Kremlin Bicêtre , France.,g INSERM U1169 , University Paris Sud Paris-Saclay , Le Kremelin Bicêtre, France
| | - Marc D McKee
- h Faculties of Dentistry and Medicine, Department of Anatomy and Cell Biology , McGill University , Montreal , Canada
| | - Catherine Chaussain
- a Orofacial Pathologies, Imaging and Biotherapies Laboratory EA2496, Dental School , Paris Descartes University , Paris , France.,i Department of Odontology , Bretonneau Hospital PNVS, AP-HP , Paris , France
| | - Claire Bardet
- a Orofacial Pathologies, Imaging and Biotherapies Laboratory EA2496, Dental School , Paris Descartes University , Paris , France
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13
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Coutel X, Olejnik C, Marchandise P, Delattre J, Béhal H, Kerckhofs G, Penel G. A Novel microCT Method for Bone and Marrow Adipose Tissue Alignment Identifies Key Differences Between Mandible and Tibia in Rats. Calcif Tissue Int 2018; 103:189-197. [PMID: 29383407 DOI: 10.1007/s00223-018-0397-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 01/24/2018] [Indexed: 12/11/2022]
Abstract
Bone homeostasis is influenced by the bone marrow adipose tissue (BMAT). BMAT distribution varies from one anatomical location in the skeleton to another. We developed an advanced microfocus computed tomography imaging and analysis protocol that allows accurate alignment of both the BMAT distribution and bone micro-architecture as well as calculation of the distance of the BMAT adipocytes from the bone surface. Using this protocol, we detected a different spatial BMAT distribution between the rat tibia and mandible: in the proximal metaphysis of the tibia a large amount of BMAT (~ 20% of the total BMAT) was located close to the bone surface (< 20 µm), whereas in the alveolar ridge ~ 30% of the total BMAT was located between 40 and 60 µm from the bone surface. In the alveolar ridge of rats, the trabecular bone volume was 48.3% higher compared to the proximal metaphysis of the tibia (p < 0.0001) and the percentage of adiposity determined to the relative marrow volume was lower (1.5%) compared to the proximal metaphysis of the tibia (9%, p = 0.0002). Interestingly, in the tibia a negative correlation was found between the percentage of adiposity in the total volume and the trabecular thickness (r =- 0.74, p = 0.037). The present study highlights that in comparison to tibial proximal metaphysis, the mandibular bone exhibits a massive trabecular network and a low BMAT content with almost no contact with the bone surface. These findings are of great interest because of the importance of the fat-bone interaction and its potential relevance to several resorptive bone diseases.
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Affiliation(s)
- Xavier Coutel
- Univ.Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France.
| | - Cécile Olejnik
- Univ.Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
| | - Pierre Marchandise
- Univ.Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
| | - Jérôme Delattre
- Univ.Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
| | - Hélène Béhal
- Univ. Lille, CHU Lille, EA 2694 - Santé publique: épidémiologie et qualité des soins, Unité de Méthodologie et Biostatistiques, 59000, Lille, France
| | - Greet Kerckhofs
- Department of Development and Regeneration, Skeletal Biology and Engineering Center, KU Leuven, Leuven, Belgium
- Prometheus, Division of Skeletal Tissue Engineering, KU Leuven, Leuven, Belgium
| | - Guillaume Penel
- Univ.Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, 59000, Lille, France
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14
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Abstract
The influence of six common substrates on the Raman imaging of micron-sized inorganic aerosol particles was examined. Laboratory-generated single-component particles of calcite (CaCO3) and mixed particles of calcite (CaCO3), nitratine (NaNO3), hematite (Fe2O3) and anglesite (PbSO4) were deposited by cascade impaction on Ag, In, Si, SiO2, microscope slide and TEM-grid substrates. The spectral contribution of substrates to Raman images of the deposited particles was evaluated by Multivariate Curve Resolution. The shape and intensity of the substrate spectra affect the effectiveness capability of the spectral deconvolution. The substrates were characterized and compared with respect to their effect on the reconstruction of Raman images of aerosol particles. The TEM-grid substrate yielded spatially stable sample measurements with a homogeneous spectral contribution, satisfactory Raman map reconstruction and the potential for application in other techniques (e.g., SEM-EDX).
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Affiliation(s)
- Guillaume Falgayrac
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, F-59000 Lille, France.
| | - Damian Siepka
- Laboratoire de Spectrochimie Infrarouge et Raman, UMR CNRS 8516, Lille 1 University - Science and Technology, Bat. C5, 59655 Villeneuve d'Ascq Cedex, France; Institut des Sciences Moléculaires, UMR CNRS 5255, University of Bordeaux, 351 cours de la Libération, 33405 Talence, France; Laboratory of Composite and Biomimetic Materials, Centre for Interdisciplinary Research, The John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708 Lublin, Poland
| | - Elżbieta A Stefaniak
- Laboratory of Composite and Biomimetic Materials, Centre for Interdisciplinary Research, The John Paul II Catholic University of Lublin, Konstantynów 1J, 20-708 Lublin, Poland
| | - Guillaume Penel
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, F-59000 Lille, France
| | - Sophie Sobanska
- Laboratoire de Spectrochimie Infrarouge et Raman, UMR CNRS 8516, Lille 1 University - Science and Technology, Bat. C5, 59655 Villeneuve d'Ascq Cedex, France; Institut des Sciences Moléculaires, UMR CNRS 5255, University of Bordeaux, 351 cours de la Libération, 33405 Talence, France.
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15
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Kerckhofs G, Stegen S, van Gastel N, Sap A, Falgayrac G, Penel G, Durand M, Luyten FP, Geris L, Vandamme K, Parac-Vogt T, Carmeliet G. Simultaneous three-dimensional visualization of mineralized and soft skeletal tissues by a novel microCT contrast agent with polyoxometalate structure. Biomaterials 2018; 159:1-12. [DOI: 10.1016/j.biomaterials.2017.12.016] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 12/08/2017] [Accepted: 12/20/2017] [Indexed: 12/14/2022]
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16
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Delannoy Y, Colard T, Cannet C, Mesli V, Hédouin V, Penel G, Ludes B. Characterization of bone diagenesis by histology in forensic contexts: a human taphonomic study. Int J Legal Med 2017; 132:219-227. [PMID: 28965197 DOI: 10.1007/s00414-017-1699-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 09/22/2017] [Indexed: 10/18/2022]
Abstract
The diagenesis of a bone in the postmortem period causes an identifiable deterioration in histology. This degradation is characterized by a collagenous alteration, which can be observed very early. In order to develop a method for determining a postmortem interval for medico-legal use, two ribs collected from six human bodies were studied prospectively over 2 years. Each bone was studied after staining with Sirius red to demonstrate the degradation of collagen as a function of time. This study demonstrated a time-based bone alteration characterized by the architectural degradation of the lamellar bone, without any microbial influence in this postmortem period. The staining was carried out by using Sirius red and correlated this alteration with a collagenic degradation by chemical hydrolysis owing to the affinity of this dye to the amino acids lysine, hydroxylysine, and arginine. Our work asserts that human bone samples that were studied in a controlled environment and analyzed for 24 months underwent a diagenetic trajectory whose main element was collagen hydrolysis.
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Affiliation(s)
- Yann Delannoy
- Institut Médico-Légal de Paris, Université Paris Descartes Sorbonne Cité, 75000, Paris, France. .,CHU de LILLE, 59000, Lille, France. .,EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Lille University, 59000, Lille, France. .,Littoral Côte d'Opale, EA 4490, PMOI, Physiopathologie des Maladies Osseuses inflammatoires, Lille University, 59000, Lille, France. .,Institut de Médecine Légale - CHRU de Lille, rue André Verhaeghe, 59037, Lille Cedex, France.
| | - Thomas Colard
- CHU de LILLE, 59000, Lille, France.,EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Lille University, 59000, Lille, France.,Littoral Côte d'Opale, EA 4490, PMOI, Physiopathologie des Maladies Osseuses inflammatoires, Lille University, 59000, Lille, France
| | - Catherine Cannet
- Laboratoire d'Histomorphométrie de Médecine Légale, Faculté de Médecine, 67000, Strasbourg, France
| | - Vadim Mesli
- CHU de LILLE, 59000, Lille, France.,EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Lille University, 59000, Lille, France
| | - Valéry Hédouin
- CHU de LILLE, 59000, Lille, France.,EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Lille University, 59000, Lille, France
| | - Guillaume Penel
- CHU de LILLE, 59000, Lille, France.,Littoral Côte d'Opale, EA 4490, PMOI, Physiopathologie des Maladies Osseuses inflammatoires, Lille University, 59000, Lille, France
| | - Bertrand Ludes
- Institut Médico-Légal de Paris, Université Paris Descartes Sorbonne Cité, 75000, Paris, France.,CNRS UMR 5288, AMIS, Toulouse University, 31000, Toulouse, France
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17
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Coyac BR, Falgayrac G, Baroukh B, Slimani L, Sadoine J, Penel G, Biosse-Duplan M, Schinke T, Linglart A, McKee MD, Chaussain C, Bardet C. Tissue-specific mineralization defects in the periodontium of the Hyp mouse model of X-linked hypophosphatemia. Bone 2017; 103:334-346. [PMID: 28764922 DOI: 10.1016/j.bone.2017.07.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 07/22/2017] [Accepted: 07/27/2017] [Indexed: 01/28/2023]
Abstract
X-linked hypophosphatemia (XLH) is a dento-osseous disorder caused by inactivating mutations in the PHEX gene, leading to renal phosphate wasting and hypophosphatemia, and impaired mineralization of bones and teeth. In the oral cavity, recent reports suggest a higher susceptibility of XLH patients to periodontitis, where patients present with impaired tooth cementum - a bone-like tissue involved in tooth attachment to the jaw bones and post-eruption tooth positioning - and a higher frequency of intrabony defects. In the present study, the pathobiology of alveolar bone and tooth cementum was investigated in the Hyp mouse, the murine analog of XLH. PHEX deficiency in XLH/Hyp dramatically alters the periodontal phenotype, with hypoplasia of tooth root cementum associated with a lack of periodontal ligament attachment and the presence of an immature apatitic mineral phase of all periodontal mineralized tissues. Challenging the Hyp periodontium in two surgical experimental models - ligature-induced periodontal breakdown and repair, and a model of tooth movement adaptation inducing cementum formation - we show that bone and cementum formation, and their healing, are altered. Bone and cementum mineralization appear similarly disturbed, where hypomineralized pericellular matrix surrounds cells, and where the protein osteopontin (OPN, a mineralization inhibitor) accumulates in a tissue-specific manner, most notably in the perilacunar matrix surrounding osteocytes. Although the pathobiology is different between XLH/Hyp bone and cementum, our results show a major XLH phenotype in oral mineralized tissues consistent with variations in patient susceptibility to periodontal disorders.
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Affiliation(s)
- Benjamin R Coyac
- EA2496, Faculty of Dentistry, Paris Descartes University, Montrouge, France; Department of Periodontology, U.F.R. of Odontology, Rothschild Hospital, AP-HP, Paris Diderot University, Paris, France
| | - Guillaume Falgayrac
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, F-59000 Lille, France
| | - Brigitte Baroukh
- EA2496, Faculty of Dentistry, Paris Descartes University, Montrouge, France
| | - Lotfi Slimani
- EA2496, Faculty of Dentistry, Paris Descartes University, Montrouge, France
| | - Jérémy Sadoine
- EA2496, Faculty of Dentistry, Paris Descartes University, Montrouge, France
| | - Guillaume Penel
- Univ. Lille, Univ. Littoral Côte d'Opale, EA 4490 - PMOI - Physiopathologie des Maladies Osseuses Inflammatoires, F-59000 Lille, France
| | - Martin Biosse-Duplan
- Department of Odontology, Bretonneau Hospital PNVS, AP-HP, Paris, France; APHP, Reference Center for Rare Disorders of the Calcium and Phosphate Metabolism, Filière OSCAR and Plateforme d'Expertise Maladies Rares Paris-Sud, Hôpital Bicêtre Paris Sud, Le Kremlin Bicêtre, France
| | - Thorsten Schinke
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Agnès Linglart
- APHP, Reference Center for Rare Disorders of the Calcium and Phosphate Metabolism, Filière OSCAR and Plateforme d'Expertise Maladies Rares Paris-Sud, Hôpital Bicêtre Paris Sud, Le Kremlin Bicêtre, France; INSERM U1169, Hôpital Bicêtre, Le Kremlin Bicêtre, and Université Paris-Saclay, France
| | - Marc D McKee
- Faculties of Dentistry and Medicine, Department of Anatomy and Cell Biology, McGill University, Montreal, Canada
| | - Catherine Chaussain
- EA2496, Faculty of Dentistry, Paris Descartes University, Montrouge, France; Department of Odontology, Bretonneau Hospital PNVS, AP-HP, Paris, France; APHP, Reference Center for Rare Disorders of the Calcium and Phosphate Metabolism, Filière OSCAR and Plateforme d'Expertise Maladies Rares Paris-Sud, Hôpital Bicêtre Paris Sud, Le Kremlin Bicêtre, France
| | - Claire Bardet
- EA2496, Faculty of Dentistry, Paris Descartes University, Montrouge, France.
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18
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Coyac BR, Hoac B, Chafey P, Falgayrac G, Slimani L, Rowe PS, Penel G, Linglart A, McKee MD, Chaussain C, Bardet C. Defective Mineralization in X-Linked Hypophosphatemia Dental Pulp Cell Cultures. J Dent Res 2017; 97:184-191. [PMID: 28880715 DOI: 10.1177/0022034517728497] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
X-linked hypophosphatemia (XLH) is a skeletal disease caused by inactivating mutations in the PHEX gene. Mutated or absent PHEX protein/enzyme leads to a decreased serum phosphate level, which cause mineralization defects in the skeleton and teeth (osteomalacia/odontomalacia). It is not yet altogether clear whether these manifestations are caused solely by insufficient circulating phosphate availability for mineralization or also by a direct, local intrinsic effect caused by impaired PHEX activity. Here, we evaluated the local role of PHEX in a 3-dimensional model of extracellular matrix (ECM) mineralization. Dense collagen hydrogels were seeded either with human dental pulp cells from patients with characterized PHEX mutations or with sex- and age-matched healthy controls and cultured up to 24 d using osteogenic medium with standard phosphate concentration. Calcium quantification, micro-computed tomography, and histology with von Kossa staining for mineral showed significantly lower mineralization in XLH cell-seeded scaffolds, using nonparametric statistical tests. While apatitic mineralization was observed along collagen fibrils by electron microscopy in both groups, Raman microspectrometry indicated that XLH cells harboring the PHEX mutation produced less mineralized scaffolds having impaired mineral quality with less carbonate substitution and lower crystallinity. In the XLH cultures, immunoblotting revealed more abundant osteopontin (OPN), dentin matrix protein 1 (DMP1), and matrix extracellular phosphoglycoprotein (MEPE) than controls, as well as the presence of fragments of these proteins not found in controls, suggesting a role for PHEX in SIBLING protein degradation. Immunohistochemistry revealed altered OPN and DMP1 associated with an increased alkaline phosphatase staining in the XLH cultures. These results are consistent with impaired PHEX activity having local ECM effects in XLH. Future treatments for XLH should target both systemic and local manifestations.
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Affiliation(s)
- B R Coyac
- 1 EA 2496 Laboratory Orofacial Pathologies, Imaging and Biotherapies, Dental School University Paris Descartes Sorbonne Paris Cité, and Life imaging Platform (PIV), Montrouge, France.,2 Department of Periodontology, U.F.R. of Odontology, Rothschild Hospital, AP-HP, Paris Diderot University, Paris, France.,3 Faculty of Dentistry, Division of Biomedical Sciences, McGill University, Montreal, QC, Canada
| | - B Hoac
- 3 Faculty of Dentistry, Division of Biomedical Sciences, McGill University, Montreal, QC, Canada
| | - P Chafey
- 4 INSERM U1016, Institut Cochin and Proteomic core facility of University Paris Descartes (3P5) Sorbonne Paris Cité, Paris, France
| | - G Falgayrac
- 5 Lille University, University of Littoral Côte d'Opale, EA 4490-PMOI-Pathophysiology of Inflammatory Bone Diseases, Lille, France
| | - L Slimani
- 1 EA 2496 Laboratory Orofacial Pathologies, Imaging and Biotherapies, Dental School University Paris Descartes Sorbonne Paris Cité, and Life imaging Platform (PIV), Montrouge, France
| | - P S Rowe
- 6 The Kidney Institute, University of Kansas Medical Center, Kansas City, KS, USA
| | - G Penel
- 5 Lille University, University of Littoral Côte d'Opale, EA 4490-PMOI-Pathophysiology of Inflammatory Bone Diseases, Lille, France
| | - A Linglart
- 7 APHP, Reference Center for Rare Disorders of Calcium and Phosphate Metabolism, Plateforme of Expertise Paris Sud for Rare Disesdes, filière OSCAR, Bicêtre Hospital, Le Kremlin-Bicêtre, France.,8 INSERM U1169, University Paris Sud Paris-Saclay, Paris, France
| | - M D McKee
- 3 Faculty of Dentistry, Division of Biomedical Sciences, McGill University, Montreal, QC, Canada.,9 Faculty of Medicine, Department of Anatomy and Cell Biology, McGill University, Montreal, QC, Canada
| | - C Chaussain
- 1 EA 2496 Laboratory Orofacial Pathologies, Imaging and Biotherapies, Dental School University Paris Descartes Sorbonne Paris Cité, and Life imaging Platform (PIV), Montrouge, France.,7 APHP, Reference Center for Rare Disorders of Calcium and Phosphate Metabolism, Plateforme of Expertise Paris Sud for Rare Disesdes, filière OSCAR, Bicêtre Hospital, Le Kremlin-Bicêtre, France.,10 Department of Odontology, Bretonneau Hospital PNVS, AP-HP, Paris, France
| | - C Bardet
- 1 EA 2496 Laboratory Orofacial Pathologies, Imaging and Biotherapies, Dental School University Paris Descartes Sorbonne Paris Cité, and Life imaging Platform (PIV), Montrouge, France
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19
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Colard T, Falgayrac G, Bertrand B, Naji S, Devos O, Balsack C, Delannoy Y, Penel G. Correction: New Insights on the Composition and the Structure of the Acellular Extrinsic Fiber Cementum by Raman Analysis. PLoS One 2017; 12:e0174080. [PMID: 28282444 PMCID: PMC5345870 DOI: 10.1371/journal.pone.0174080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
[This corrects the article DOI: 10.1371/journal.pone.0167316.].
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20
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Pascart T, Falgayrac G, Migaud H, Quinchon JF, Norberciak L, Budzik JF, Paccou J, Cotten A, Penel G, Cortet B. Region specific Raman spectroscopy analysis of the femoral head reveals that trabecular bone is unlikely to contribute to non-traumatic osteonecrosis. Sci Rep 2017; 7:97. [PMID: 28273910 PMCID: PMC5427816 DOI: 10.1038/s41598-017-00162-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 02/13/2017] [Indexed: 01/26/2023] Open
Abstract
Non-traumatic osteonecrosis (ON) of the femoral head is a common disease affecting a young population as the peak age of diagnosis is in the 40 s. The natural history of non-traumatic ON leads to a collapse of the femoral head requiring prosthetic replacement in a 60% of cases. Although trabecular bone involvement in the collapse is suspected, the underlying modifications induced at a molecular level have not been explored in humans. Here, we examine changes in the molecular composition and structure of bone as evaluated by Raman spectroscopy in human end-stage ON. Comparing samples from femoral heads harvested from 11 patients and 11 cadaveric controls, we show that the mineral and organic chemical composition of trabecular bone in ON is not modified apart from age-related differences. We also show that the molecular composition in the necrotic part of the femoral head is not different from the composition of the remaining ‘healthy’ trabecular bone of the femoral head. These findings support that quality of trabecular bone is not modified during ON despite extensive bone marrow necrosis and osteocyte death observed even in the ‘healthy’ zones on histological examination.
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Affiliation(s)
- Tristan Pascart
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France. .,Department of Rheumatology, Saint-Philibert Hospital, Lille University, F-59160, Lomme, France.
| | - Guillaume Falgayrac
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France
| | - Henri Migaud
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France.,Department of Orthopaedic Surgery, Lille University Hospital, Lille University, F-59000, Lille, France
| | - Jean-François Quinchon
- Department of Anatomopathology, Saint-Philibert Hospital, Lille University, F-59160, Lomme, France
| | - Laurène Norberciak
- Department of biostatistics, Saint-Philibert Hospital, Lille University, F-59160, Lomme, France
| | - Jean-François Budzik
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France.,Department of Radiology,Saint-Philibert Hospital, Lille University, F-59160, Lomme, France
| | - Julien Paccou
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France.,Department of Rheumatology, Lille University Hospital, Lille University, F-59000, Lille, France
| | - Anne Cotten
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France.,Department of Radiology, Lille University Hospital, Lille University, F-59000, Lille, France
| | - Guillaume Penel
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France
| | - Bernard Cortet
- Lille University, Littoral Côte d'Opale University, EA 4490, PMOI, Physiopathologie des Maladies Osseuses Inflammatoires, F-59000, Lille, France.,Department of Rheumatology, Lille University Hospital, Lille University, F-59000, Lille, France
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Colard T, Falgayrac G, Bertrand B, Naji S, Devos O, Balsack C, Delannoy Y, Penel G. New Insights on the Composition and the Structure of the Acellular Extrinsic Fiber Cementum by Raman Analysis. PLoS One 2016; 11:e0167316. [PMID: 27936010 PMCID: PMC5147880 DOI: 10.1371/journal.pone.0167316] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 11/13/2016] [Indexed: 01/04/2023] Open
Abstract
Acellular extrinsic fiber cementum is a mineralized tissue that covers the cervical half of the tooth root surface. It contains mainly extrinsic or Sharpey's fibers that run perpendicular to the root surface to anchor the tooth via the periodontal ligament. Acellular cementum is continuously and slowly produced throughout life and exhibits an alternating bright and dark pattern under light microscopy. However, although a better understanding of the structural background of acellular cementum is relevant to many fields, such as cementochronology, periodontology and tissue engineering, acellular cementum remains rarely studied and poorly understood. In this work, we studied the acellular cementum at the incremental line scale of five human mandibular canines using polarized Raman spectroscopy. We provided Raman imaging analysis and polarized acquisitions as a function of the angular orientation of the sample. The results showed that mineral crystals were always parallel to collagen fibrils, and at a larger scale, we proposed an organizational model in which we found radial collagen fibers, "orthogonal" to the cementum surface, and "non-orthogonal" fibers, which consist of branching and bending radial fibers. Concerning the alternating pattern, we observed that the dark lines corresponded to smaller, more mineralized and probably more organized bands, which is consistent with the zoological assumption that incremental lines are produced during a winter rest period of acellular cementum growth.
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Affiliation(s)
- Thomas Colard
- Univ. Lille, CHU Lille, EA 7367—UTML—Unité de Taphonomie Médico-Légale, Lille, France
| | - Guillaume Falgayrac
- Univ. Lille, EA 4490—PMOI–Physiopathologie des Maladies Osseuses Inflammatoires, Lille, France
| | - Benoit Bertrand
- Univ. Lille, CHU Lille, EA 7367—UTML—Unité de Taphonomie Médico-Légale, Lille, France
| | - Stephan Naji
- CIRHUS-NYU, New York City, NY, United States of America
| | - Olivier Devos
- Univ. Lille, CNRS, UMR 8516—LASIR—Laboratoire de Spectrochimie et Raman, Lille, France
| | - Clara Balsack
- Univ. Lille, CHU Lille, EA 7367—UTML—Unité de Taphonomie Médico-Légale, Lille, France
| | - Yann Delannoy
- Univ. Lille, CHU Lille, EA 7367—UTML—Unité de Taphonomie Médico-Légale, Lille, France
| | - Guillaume Penel
- Univ. Lille, EA 4490—PMOI–Physiopathologie des Maladies Osseuses Inflammatoires, Lille, France
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Olejnik C, Falgayrac G, During A, Cortet B, Penel G. Doses effects of zoledronic acid on mineral apatite and collagen quality of newly-formed bone in the rat's calvaria defect. Bone 2016; 89:32-39. [PMID: 27168397 DOI: 10.1016/j.bone.2016.05.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 04/18/2016] [Accepted: 05/05/2016] [Indexed: 01/12/2023]
Abstract
Due to their inhibitory effects on resorption, bisphosphonates are widely used in the treatment of diseases associated to an extensive bone loss. Yet, little is known about bisphosphonates effects on newly-formed bone quality. In the present study, adult male Sprague-Dawley rats (n=80) with a bone defect calvaria area were used and short-term effects of zoledronic acid (ZA) were studied on the healing bone area. Three ZA treatments were tested by using either: 1°) a low single dose (120μgZA/kg, n=10; equivalent to human osteoporosis treatment), 2°) a low fractionated doses (20μgZA/kg daily for 6days either a total of 120μg/kg, n=15), and 3°) a high fractionated doses, (100μgZA/kg weekly for 6weeks, n=15; equivalent to 6months of human bone metastasis treatment). For each treatment, a control "vehicle" treatment was performed (with an identical number of rats). After ZA administration, the intrinsic bone material properties were evaluated by quantitative backscattered electron imaging (qBEI) and Raman microspectroscopy. Neither single nor fractionated low ZA doses modify the intrinsic bone material properties of the newly-formed bone compared to their respective control animals. On the opposite, the high ZA treatment resulted in a significant decrease of the crystallinity (-25%, P< 0.05) and of the hydroxyproline-to-proline ratio (-30%, P<0.05) in newly-formed bones. Moreover, with the high ZA treatment, the crystallinity was positively correlated with the hydroxyproline-to-proline ratio (ρ=0.78, P<0.0001). The present data highlight new properties for ZA on bone formation in a craniofacial defect model. As such, ZA at high doses disrupted the apatite crystal organization. In addition, we report here for the first time that high ZA doses decreased the hydroxyproline-to-proline ratio suggesting that ZA may affect the early collagen organization during the bone healing.
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Affiliation(s)
- Cécile Olejnik
- Université de Lille, EA 4490 PMOI, F-59000 Lille, France; Faculté de Chirurgie Dentaire, Place de Verdun, F-59000 Lille, France; Service d'Odontologie, Centre Abel Caumartin, CHRU de Lille, F-59000 Lille, France.
| | - Guillaume Falgayrac
- Université de Lille, EA 4490 PMOI, F-59000 Lille, France; Faculté de Chirurgie Dentaire, Place de Verdun, F-59000 Lille, France
| | - Alexandrine During
- Université de Lille, EA 4490 PMOI, F-59000 Lille, France; Faculté de Chirurgie Dentaire, Place de Verdun, F-59000 Lille, France
| | - Bernard Cortet
- Université de Lille, EA 4490 PMOI, F-59000 Lille, France; Service de Rhumatologie, Hôpital Roger Salengro, CHRU de Lille, F-59000 Lille, France
| | - Guillaume Penel
- Université de Lille, EA 4490 PMOI, F-59000 Lille, France; Faculté de Chirurgie Dentaire, Place de Verdun, F-59000 Lille, France; Service d'Odontologie, Centre Abel Caumartin, CHRU de Lille, F-59000 Lille, France
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Delannoy Y, Colard T, Le Garff E, Mesli V, Aubernon C, Penel G, Hedouin V, Gosset D. Effects of the environment on bone mass: A human taphonomic study. Leg Med (Tokyo) 2016; 20:61-7. [PMID: 27161926 DOI: 10.1016/j.legalmed.2016.04.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 04/18/2016] [Accepted: 04/19/2016] [Indexed: 11/20/2022]
Abstract
An experiment was designed using human ribs placed in different environments to document how moisture and temperature affect the bone mass according to the postmortem interval. The bones were defleshed, weighed and partially buried, with some ribs being left unburied as controls. The ribs were weighed daily, and the mass loss was monitored over a period of 90days. The results showed that significant differences in bone mass loss exist between environments, where the bone mass loss was significantly faster in an environment with low moisture content. This mass loss is thought to be primarily associated with the desiccation of the body and then for a greater part, with the atmospheric moisture content. However, the loss of bone mass can also be explained by early alterations in the organo-mineral matrix which were highlighted by Raman spectroscopy method.
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Affiliation(s)
- Yann Delannoy
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France; Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France; EA 4490 Physiopathologie des maladies osseuses inflammatoires, Université de Lille, F-59000 Lille, France.
| | - Thomas Colard
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France; Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France
| | - Erwan Le Garff
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France; Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France
| | - Vadim Mesli
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France; Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France
| | - Cindy Aubernon
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France
| | - Guillaume Penel
- Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France; EA 4490 Physiopathologie des maladies osseuses inflammatoires, Université de Lille, F-59000 Lille, France
| | - Valéry Hedouin
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France; Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France
| | - Didier Gosset
- EA 7367 Forensic Taphonomy Unit - Lille Forensic Institute, Université de Lille, F-59000 Lille, France; Centre Hospitalier Régional Universitaire de Lille, F-59000 Lille, France
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Pascart T, Cortet B, Olejnik C, Paccou J, Migaud H, Cotten A, Delannoy Y, During A, Hardouin P, Penel G, Falgayrac G. Bone Samples Extracted from Embalmed Subjects Are Not Appropriate for the Assessment of Bone Quality at the Molecular Level Using Raman Spectroscopy. Anal Chem 2016; 88:2777-83. [DOI: 10.1021/acs.analchem.5b04400] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Tristan Pascart
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
- Department
of Rheumatology, Saint-Philibert Hospital, Lille University, 59160 Lomme, France
| | - Bernard Cortet
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Cecile Olejnik
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Julien Paccou
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Henri Migaud
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Anne Cotten
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
| | - Yann Delannoy
- Lille University − ULCO, PMOI, EA 4490, 59000 Lille, France
- Lille University, Taphonomy Unit, EA 7367, 59000 Lille, France
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Abstract
CONTEXT There is growing interest in the relationship between bone marrow fat (BMF), bone mineral density (BMD), and fractures. Moreover, BMF might be influenced by metabolic diseases associated with bone loss and fractures, such as type 2 diabetes mellitus (T2DM), anorexia nervosa (AN), and obesity. METHODS The primary-source literature for this review was acquired using a PubMed search for articles published between January 2000 and April 2015. Search terms included BMF, BMD, fractures, T2DM, AN, and obesity. The titles and abstracts of all articles were reviewed for relevant subjects. RESULTS Magnetic resonance imaging, with or without spectroscopy, was used to noninvasively quantify BMF in humans. A negative relationship was found between BMD and BMF in both healthy and osteopenic/osteoporotic populations. Data are lacking on the relationship between BMF and fractures. Studies in populations of individuals with metabolic diseases such as T2DM, AN, and obesity have shown BMF abnormalities. CONCLUSIONS We conclude that most human data demonstrate an inverse relationship between BMF and BMD, but data on the relationship with fractures are inconsistent and need further study. In daily practice, the usefulness for clinicians of assessing BMF using magnetic resonance imaging is still limited. However, the perspectives are exciting, particularly in terms of improving the diagnosis and management of osteoporosis.
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Affiliation(s)
- Julien Paccou
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Pierre Hardouin
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Anne Cotten
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Guillaume Penel
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
| | - Bernard Cortet
- Université de Lille (J.P., A.C., G.P., B.C.), Faculté de Chirurgie Dentaire, Place de Verdun, 59000 Lille, France; Service de Rhumatologie (J.P., B.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France; Université du Littoral Côte (P.H.), 62327 Boulogne-sur-Mer, France; and Service d'Imagerie Musculo-Squelettique (A.C.), Centre Hospitalier Régional Universitaire, 59000 Lille, France
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During A, Penel G, Hardouin P. Understanding the local actions of lipids in bone physiology. Prog Lipid Res 2015; 59:126-46. [PMID: 26118851 DOI: 10.1016/j.plipres.2015.06.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 06/12/2015] [Accepted: 06/18/2015] [Indexed: 12/19/2022]
Abstract
The adult skeleton is a metabolically active organ system that undergoes continuous remodeling to remove old and/or stressed bone (resorption) and replace it with new bone (formation) in order to maintain a constant bone mass and preserve bone strength from micro-damage accumulation. In that remodeling process, cellular balances--adipocytogenesis/osteoblastogenesis and osteoblastogenesis/osteoclastogenesis--are critical and tightly controlled by many factors, including lipids as discussed in the present review. Interest in the bone lipid area has increased as a result of in vivo evidences indicating a reciprocal relationship between bone mass and marrow adiposity. Lipids in bones are usually assumed to be present only in the bone marrow. However, the mineralized bone tissue itself also contains small amounts of lipids which might play an important role in bone physiology. Fatty acids, cholesterol, phospholipids and several endogenous metabolites (i.e., prostaglandins, oxysterols) have been purported to act on bone cell survival and functions, the bone mineralization process, and critical signaling pathways. Thus, they can be regarded as regulatory molecules important in bone health. Recently, several specific lipids derived from membrane phospholipids (i.e., sphingosine-1-phosphate, lysophosphatidic acid and different fatty acid amides) have emerged as important mediators in bone physiology and the number of such molecules will probably increase in the near future. The present paper reviews the current knowledge about: (1°) bone lipid composition in both bone marrow and mineralized tissue compartments, and (2°) local actions of lipids on bone physiology in relation to their metabolism. Understanding the roles of lipids in bone is essential to knowing how an imbalance in their signaling pathways might contribute to bone pathologies, such as osteoporosis.
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Affiliation(s)
- Alexandrine During
- Université Lille 2, Laboratoire de Physiopathologie des maladies osseuses inflammatoires (PMOI), EA4490, Faculté de Chirurgie dentaire, Lille, France.
| | - Guillaume Penel
- Université Lille 2, Laboratoire de Physiopathologie des maladies osseuses inflammatoires (PMOI), EA4490, Faculté de Chirurgie dentaire, Lille, France
| | - Pierre Hardouin
- Université Lille 2, Laboratoire de Physiopathologie des maladies osseuses inflammatoires (PMOI), EA4490, Faculté de Chirurgie dentaire, Lille, France; Université ULCO, Laboratoire de Physiopathologie des maladies osseuses inflammatoires (PMOI), EA4490, Boulogne-sur-Mer, France
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Ghali O, Broux O, Falgayrac G, Haren N, van Leeuwen JPTM, Penel G, Hardouin P, Chauveau C. Dexamethasone in osteogenic medium strongly induces adipocyte differentiation of mouse bone marrow stromal cells and increases osteoblast differentiation. BMC Cell Biol 2015; 16:9. [PMID: 25887471 PMCID: PMC4359404 DOI: 10.1186/s12860-015-0056-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 02/19/2015] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Osteoblasts and adipocytes share a common mesenchymal stem cell origin. Therefore, it has been suggested that the accumulation of marrow adipocytes observed in bone loss is caused by a shift in the commitment of mesenchymal stem cells from the osteogenic pathway to the adipogenic pathway. Supporting this hypothesis the competition between adipogenic and osteogenic lineages was widely demonstrated on partially homogeneous cell populations. However, some data from mouse models showed the existence of an independent relationship between bone mineral content and bone marrow adiposity. Therefore, the combination of adipogenesis and osteogenesis in primary culture would be helpful to determine if this competition would be observed on a whole bone marrow stromal cell population in a culture medium allowing both lineages. In this aim, mouse bone marrow stromal cells were cultured in a standard osteogenic medium added with different concentrations of Dexamethasone, known to be an important regulator of mesenchymal progenitor cell differentiation. RESULTS Gene expression of osteoblast and adipocyte markers, biochemical and physical analyses demonstrated the presence of both cell types when Dexamethasone was used at 100 nM. Overall, our data showed that in this co-differentiation medium both differentiation lineages were enhanced compared to classical adipogenic or osteogenic culture medium. This suggests that in this model, adipocyte phenotype does not seem to increase at the expense of the osteoblast lineage. CONCLUSION This model appears to be a promising tool to study osteoblast and adipocyte differentiation capabilities and the interactions between these two processes.
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Affiliation(s)
- Olfa Ghali
- Lille2-ULCO, PMOI, F-62200, Boulogne-sur-Mer, France.
| | - Odile Broux
- Lille2-ULCO, PMOI, F-62200, Boulogne-sur-Mer, France.
| | | | | | | | | | | | - Christophe Chauveau
- Lille2-ULCO, PMOI, F-62200, Boulogne-sur-Mer, France. .,PMOI, ULCO, Boulevard Napoléon, BP 120, 62327, Boulogne-sur-mer, Cedex, France.
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Olejnik C, Falgayrac G, During A, Vieillard MH, Maes JM, Cortet B, Penel G. Molecular alterations of bone quality in sequesters of bisphosphonates-related osteonecrosis of the jaws. Osteoporos Int 2014; 25:747-56. [PMID: 24081510 DOI: 10.1007/s00198-013-2514-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 09/13/2013] [Indexed: 01/09/2023]
Abstract
UNLABELLED Compared to healthy bone, the intrinsic bone materials properties in the pre-existing lamellar bone are altered in jaw bone sequesters of bisphosphonates (BP)-related osteonecrosis. INTRODUCTION The aim of this study was to evaluate the human jaw bone quality, especially intrinsic bone material properties among sequesters of osteonecrosis of the jaw (ONJ) induced by BP. METHODS Bone sequesters were obtained from 24 patients suffering from ONJ following a BP treatment. Within BP-exposed bone samples, benign-BP and malignant-BP groups were distinguished in relation to the underlying disease: osteoporosis and bone metastases or multiple myeloma, respectively. Healthy cadaveric cortical jaw bone samples were used as controls. The physicochemical parameters of bone samples - mineral/organic ratio, relative proteoglycan content, crystallinity, monohydrogen phosphate content, and type-B carbonate substitution - were evaluated by Raman microspectroscopy. Representative Raman spectral features of bones control and BP-exposed bone sequesters were identified with the Partial-Least-Square Discriminant Analysis (PLS-DA). RESULTS BP-exposed bone sequesters are characterized by a significant increase of mineral to organic ratio (+12 %) and a significant decrease of relative proteoglycan content (-35 %), thus regulating initial collagen matrix mineral deposition. Structural changes on mineral components are revealed by a significant decrease of both crystallinity (-2 %) and mineral maturation (-41 %) in the BP-exposed bone sequesters compared to healthy bones. These modifications were also observed distinctly in both benign-BP and malignant-BP groups. In addition, a shift of the phosphate ν1 band was highlighted by PLS-DA between bones control and BP-exposed bone sequesters, revealing a disruption of the apatitic phosphate environment in the jaw bone sequesters. CONCLUSIONS The present data show that jaw bone quality can be altered with an overmineralization and ultrastructural modifications of apatitic mineral in bone sequesters of BP-related ONJ.
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Affiliation(s)
- C Olejnik
- Université Lille Nord de France, 59000, Lille, France,
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Falgayrac G, Cortet B, Devos O, Barbillat J, Pansini V, Cotten A, Pasquier G, Migaud H, Penel G. Comparison of two-dimensional fast Raman imaging versus point-by-point acquisition mode for human bone characterization. Anal Chem 2012; 84:9116-23. [PMID: 22994270 DOI: 10.1021/ac301758y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Recent technical developments gave rise to a new technology for two-dimensional fast Raman imaging: the DuoScan averaging mode (DS-Avg). This technology allows the acquisition of a Raman spectrum over a rastered macro spot. The aim of this study was to evaluate the interest of the DS-Avg applied on trabecular human bone. The evaluation was based on the comparison of the DS-Avg versus the point-by-point mapping mode in real usage conditions. The signal-to-noise ratio, the spectral difference, and the physicochemical parameters were estimated for comparison of the efficiency of both modes. Principal component analysis was performed to explore the capacity of both modes to detect compositional variations. Results showed that the DS-Avg spectrum was equivalent to the average spectrum of individual spectra acquired with the point-by-point mode for the same sample area. The physicochemical parameters can be also determined from DS-Avg acquisition. The DS-Avg combined with an objective ×50 allows a drastic decrease of the acquisition time, but the information about the micrometric composition is lost. The combination of the DS-Avg with an objective ×100 is a good compromise between acquisition time and resolution. The DS-Avg is a useful technology for imaging mineral and organic phases of bones and for assessing their spatial distribution on large samples. The point-by-point imaging mode is more appropriate to assess the heterogeneous composition of bone within the micrometer scale. For the first time, this study compares the DuoScan averaging mode to the point-by-point imaging mode on a trabecular human bone.
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30
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Pansini VM, Monnet A, Salleron J, Penel G, Migaud H, Cotten A. Reproducibility of
1
H MR spectroscopy of hip bone marrow at 3 tesla. J Magn Reson Imaging 2012; 36:1445-9. [DOI: 10.1002/jmri.23783] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 07/24/2012] [Indexed: 11/09/2022] Open
Affiliation(s)
- Vittorio M. Pansini
- Service de Radiologie et d'Imagerie Musculosquelettique, Centre de Consultations et d'Imagerie de l'Appareil Locomoteur, CHRU, Lille, France
- PMOI Physiopathologie Des Maladie Osseuses, Inflammatoire Unité de recherche EA, France
| | - Aurélien Monnet
- Service de Radiologie et d'Imagerie Musculosquelettique, Centre de Consultations et d'Imagerie de l'Appareil Locomoteur, CHRU, Lille, France
| | | | - Guillaume Penel
- PMOI Physiopathologie Des Maladie Osseuses, Inflammatoire Unité de recherche EA, France
- LBM Raman, Faculté d'Odontologie, Université de Lille 2, Lille, France
| | - Henry Migaud
- PMOI Physiopathologie Des Maladie Osseuses, Inflammatoire Unité de recherche EA, France
- Orthopedic Department, Roger Salengro Hospital Lille‐Nord‐de‐France University, Lille, France
| | - Anne Cotten
- Service de Radiologie et d'Imagerie Musculosquelettique, Centre de Consultations et d'Imagerie de l'Appareil Locomoteur, CHRU, Lille, France
- PMOI Physiopathologie Des Maladie Osseuses, Inflammatoire Unité de recherche EA, France
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Olejnik C, Falgayrac G, During A, Penel G. Compatibility of fluorochrome labeling protocol with Raman spectroscopy to study bone formation. Bull Group Int Rech Sci Stomatol Odontol 2011; 50:34-36. [PMID: 22750708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Indexed: 06/01/2023]
Affiliation(s)
- C Olejnik
- Université Lille Nord de France, Faculté de Chirurgie dentaire, Pl. de Verdun, Lille, France.
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Olejnik C, Falgayrac G, Vieillard MH, Maes JM, Penel G. Molecular interaction between bisphosphonates and human bone: a preliminary study on osteonecrosis sequesters of the jaw. Bull Group Int Rech Sci Stomatol Odontol 2011; 50:52-53. [PMID: 22750602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 09/23/2011] [Indexed: 06/01/2023]
Affiliation(s)
- C Olejnik
- Université Lille Nord de France, Lille, France.
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33
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Vieillard MH, Paccou J, Cortet B, Biver E, Salleron J, Falgayrac G, Penel G. Effects of high dose of zoledronic acid on superficial vascular network of membranous bone sites: an intravital study on rat calvarium. Osteoporos Int 2010; 21:1919-25. [PMID: 20020279 DOI: 10.1007/s00198-009-1146-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Accepted: 11/09/2009] [Indexed: 10/20/2022]
Abstract
UNLABELLED We evaluated the impact of high dose of zoledronic acid on the superficial vascular network parameters of a membranous bone site. During a 5-day follow-up, significant reduction of the vascular density is observed only in the treated group. INTRODUCTION The superficial vascularization is of great importance in membranous bone-healing process. A new rat calvarium intravital model was developed to study the short-term effect of a single high dose of zoledronic acid infusion on the superficial vascularization. METHODS Optical bone chambers were implanted in the bone tissue surface of Sprague-Dawley rats' calvarium. Nine rats were injected i.v. with 400 µg/kg of zoledronic acid (Z group), and nine rats were injected with vehicle (PSS group). A 5-day follow-up of the vascular network was made by the use of pictures analysis method. RESULTS The vascular density significantly decreases only in Z group but there was no significant difference between groups at individual time points. The total length of the vascular network decreases significantly in Z group only (p=0.003) with a significant higher decrease at D3 (p=0.04) and D5 (p=0.02) compared with control. The vascular density related to the smaller vessels (width, 5-10 µm) decreases significantly between T0 and D5 in Z group only (p=0.002). CONCLUSIONS With the help of an original intravital animal model a significant modifications on the total length of the vascular network and the vascular density of small vessels are highlighted on a membranous bone site.
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Affiliation(s)
- M H Vieillard
- Department of Rheumatology, Hôpital Roger Salengro, University Lille Nord de France, CHRU Lille, 59037, Lille cedex, France.
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Juillard A, Falgayrac G, Cortet B, Vieillard MH, Azaroual N, Hornez JC, Penel G. Molecular interactions between zoledronic acid and bone: An in vitro Raman microspectroscopic study. Bone 2010; 47:895-904. [PMID: 20656084 DOI: 10.1016/j.bone.2010.07.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 06/27/2010] [Accepted: 07/17/2010] [Indexed: 11/25/2022]
Abstract
The aim of this study was to investigate molecular interactions between a bisphosphonate (BP), zoledronic acid, and bone tissue by the use of Raman microspectroscopy. In this way, samples of hydroxyapatite (HA), as a bone model, and Wistar rat femurs were soaking in zoledronic acid solutions. Sample surfaces were studied by Environmental Scanning Electron Microscopy and Raman spectroscopy. The amount of zoledronic acid incorporated onto the samples and the inorganic phosphate released in solution were determined by (31)P NMR spectroscopy. Total carbonate content in solution was evaluated by inorganic carbon analyser. After impregnation new Raman bands with frequencies close to characteristic peaks of zoledronic acid (in particular phosphate moieties and imidazole ring of the R2 side-chain) were observed on both types of samples. Physico-chemical parameters of the bone were also significantly modified (P<0.0001). The mineral to organic ratio and the carbonate to phosphate ratio decreased and the crystallinity increased. Released inorganic phosphate and carbonate were detected in the solutions. The Raman shift of the bands corresponding to the phosphate groups and the imidazole ring of the BP highlight their implication in the binding to the mineral. The detection of released inorganic phosphate and carbonate in solution, the modifications of the mineral to phosphate ratio and the carbonate to phosphate ratio reveal that BP decrease the amount of inorganic phosphate and limit the dissolution of bone mineral. The increase of the crystallinity after BP binding shows a re-organisation of the lattice with a higher symmetry. Thus, it seems that zoledronic acid has an important contribution on the increase of crystallinity. The use of Raman spectrometry brings new and complementary information on the impact of zoledronic acid on bone composition at molecular level. Raman spectrometry could help to understand by which way BPs improve bone strength and decrease fracture risk.
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35
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Desmons SO, Salleron J, Delfosse CJ, Falgayrac G, Penel G, Mordon SR. Laser preconditioning on cranial bone site: analysis of morphological vascular parameters. Lasers Surg Med 2010; 42:631-7. [PMID: 20976803 DOI: 10.1002/lsm.20971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND AND OBJECTIVES Bone vascularization is a key factor in the bone healing process following X-ray irradiation. Preserving the vascular network from X-ray-induced injury is a relevant approach in the promotion of bone healing. Previously, we developed a protocol of laser preconditioning (810 nm diode laser, 36 J/cm²) prior to X-ray radiation (18.75 Gy) which protects the bone vascular network from deleterious effects of X-ray radiation. The aim of this present work is to characterize the effects of laser preconditioning on the bone through a morphological analysis of vascular parameters. MATERIALS AND METHODS Digital images of the vascular plexus were taken through an optical bone chamber which was implanted onto the calvaria of rabbits. Bespoke software was used for the quantification of the vessels (classified in four groups according to their diameter), vessel length, and number of nodes at weeks 0, 4, and 8. Twenty rabbits were divided into four groups: control group #1 (n = 5); laser group #2 (n = 5). X-ray radiation group #3 (n = 5), laser preconditioning 24 hours prior to X-ray radiation group #4 (n = 5). RESULTS The bone vascular network was stable for groups #1 and #2. Statistical analysis showed a significant reduction of each observed vascular parameter for groups #3 and #4. In the laser preconditioned group #4 the loss was less marked than in the X-ray group #3, especially for large vessels (diameter >50 µm). DISCUSSION AND CONCLUSION We provide in vivo microcirculatory evidence to support the concept of laser preconditioning of bone. A computer-based semi-automatic system is described to quantify superficial bone vascular network parameters that had been treated by laser preconditioning prior to X-ray radiation. Laser preconditioning significantly attenuates the deletion of the superficial bone vascular network irradiated by X-ray, especially concerning large diameter vessels.
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Falgayrac G, Facq S, Leroy G, Cortet B, Penel G. New method for Raman investigation of the orientation of collagen fibrils and crystallites in the Haversian system of bone. Appl Spectrosc 2010; 64:775-780. [PMID: 20615291 DOI: 10.1366/000370210791666255] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Knowledge of the organization of the components of bone is of primary importance in understanding how this tissue responds to stresses and provides a starting point for the design and development of biomaterials. Bone structure has been the subject of numerous studies. The mineralized fiber arrangement in cortical bone is either a twisted or orthogonal plywood structure. Both mineral models coexist in compact bone. Raman polarized spectroscopy offers definite advantages in the study of biological samples, enabling the simultaneous analysis of mineral and organic components and the determination of molecular orientation through the polarization properties of the Raman scattering. In this study, we used the Raman polarization approach to simultaneously investigate the orientation of collagen fibrils and apatite crystals in human cortical bone. Raman bands ratios were monitored as a function of sample orientation. Specific ratios were chosen--such as nu(3) PO(4)/nu(1) PO(4), amide III (1271 cm(-1))/amide III (1243 cm(-1)), and amide I/amide III (1243 cm(-1))--due to their sensitivity to apatite-crystal and collagen-fibril orientation. Based on this original approach, spatial changes were monitored as a function of distance from the Haversian canal. The results revealed simultaneous tilting in intra-lamellar collagen-fibril and mineral crystal orientations. These results are consistent with a twisted plywood organization in the Haversian bone structure at the lamellar level. But at molecular level, the co-alignment of the collagen fibrils and the apatite crystal is observed in the innermost lamellae and becomes gradually less ordered as the distance from the Haversian canal increases. This work highlights the interest of Raman spectroscopy for the multiscale investigation of bone structure.
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37
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Biver E, Vieillard MH, Cortet B, Salleron J, Falgayrac G, Penel G. No anti-angiogenic effect of clinical dosing regimens of a single zoledronic acid injection in an experimental bone healing site. Bone 2010; 46:643-8. [PMID: 19895916 DOI: 10.1016/j.bone.2009.10.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 10/15/2009] [Accepted: 10/28/2009] [Indexed: 02/06/2023]
Abstract
INTRODUCTION An anti-angiogenic effect of bisphosphonates has been reported in different experimental models. Zoledronic acid is currently administered in osteoporotic patients as a single 5 mg injection once a year and its vascular effect in bone has not been yet evaluated. MATERIALS AND METHODS The vascular dose effect of a single injection of zoledronic acid was evaluated on healing vascularization developed under a bone chamber implanted on the calvaria of 30 rats. After 3 weeks of healing, the rats were randomized into 3 groups receiving an injection of either physiologic saline solution (PSS) or zoledronic acid tested at 120 microg/kg, the equivalent of a 5 mg dose of zoledronic acid in humans (Z120), and 400 microg/kg, a supra-pharmacologic dose (Z400). A longitudinal follow-up of the healing vascular network was carried out at days (D) 1, 3, 6, 9, 12, 15 and 28 after injection by intravital imaging. Variations in vascular density, total length of the vascular network and mean diameter of vascular network branches were determined by image analysis (Aphelion software). RESULTS A decrease was observed in both vascular density and total length of the network in control and treated groups (time effect). No difference in variation in vascular density was observed between the PSS group and the Z120 group at any time point (p=NS). A trend to a higher decrease in vascular density was noted between D12 and D15 in the Z400 group. A significant decrease in total length was noted at D15 in the Z400 group (p=0.03) compared to the PSS group, whereas no change was noted in rats treated with 120 microg/kg compared to PSS rats on any of the follow-up days (p=0.2). No variation in mean diameter of vascular network branches was noted in any of the three groups at any of the follow-up days (p=0.53). CONCLUSION A single injection of clinically relevant dosing regimens of zoledronic acid may not have a notable impact on vascularization in bone sites. The anti-angiogenic effect of bisphosphonates seems to express itself, in our model, at higher doses than those used in patients treated for osteoporosis.
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Affiliation(s)
- E Biver
- Department of Rheumatology, CHRU Lille, University Lille Nord de France, 59037 Lille, France.
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38
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Desmons S, Heger M, Delfosse C, Falgayrac G, Sarrazin T, Delattre C, Catros S, Mordon S, Penel G. A preliminary investigation into the effects of X-ray radiation on superficial cranial vascularization. Calcif Tissue Int 2009; 84:379-87. [PMID: 19190840 DOI: 10.1007/s00223-009-9217-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2008] [Accepted: 01/06/2009] [Indexed: 10/21/2022]
Abstract
Radiation therapy (RT) is an established treatment modality for malignant neoplasms. RT induces tissue damage that may lead to osteoradionecrosis in more severe cases. Suitable animal models to study RT-induced changes in membranous craniofacial bone are currently not available. The aim of this study was therefore to quantify RT-induced changes in cranial microcirculation using a newly developed calvaria chamber model and to relate these changes to RT-induced histological damage. New Zealand white rabbits received a total radiation dose of 18.75 Gy through the calvaria chamber, and the number of vessels, the vessel length density (VLD), and angiogenic sprouting were quantified on a weekly basis during a 12-week period. At the end of 12 weeks, the RT-treated (n = 5) or control (n = 5) calvarias were biopsied for histopathological analysis. RT resulted in a steep reduction in the number of vessels and the VLD during the first 3 weeks, particularly in larger-diameter vessels, followed by a flat stabilization/remodeling phase in the subsequent 9 weeks that never restored to baseline values. Histomorphometric analysis revealed a high degree of osteocytic depletion, prominent hypocellularity in the lacunae and intraosseous vasculature, enlarged and nonconcentric Haversian systems, and a severely disorganized bone matrix in the RT-treated calvarias. Despite the prevalence of some angiogenic potential, the RT-induced effects in the early phase persisted in the intermediate to late phase, which may have contributed to the poor recovery of the RT-treated bone.
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Affiliation(s)
- Sophie Desmons
- School of Dentistry, Lille University Hospital, IFR, IMPRT, Lille, France.
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39
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Desmons S, Delfosse C, Rochon P, Buys B, Devos P, Falgayrac G, Penel G, Mordon S. Préconditionnement laser en site osseux membraneux : mise au point d’un modèle d’étude. Ing Rech Biomed 2008. [DOI: 10.1016/j.rbmret.2008.02.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Vieillard MH, Maes JM, Penel G, Facon T, Magro L, Bonneterre J, Cortet B. Thirteen cases of jaw osteonecrosis in patients on bisphosphonate therapy. Joint Bone Spine 2008; 75:34-40. [DOI: 10.1016/j.jbspin.2007.05.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2006] [Accepted: 05/03/2007] [Indexed: 11/16/2022]
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41
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Desmons SO, Delfosse CJ, Rochon P, Buys B, Penel G, Mordon S. Laser preconditioning of calvarial bone prior to an X-ray radiation injury: A preliminary in vivo study of the vascular response. Lasers Surg Med 2008; 40:28-37. [DOI: 10.1002/lsm.20595] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Desmons S, Delfosse C, Rochon P, Buys B, Penel G, Mordon S. Effect of a laser irradiation on the vascularisation of safety and X-ray radiated bone. Annu Int Conf IEEE Eng Med Biol Soc 2007; 2007:5846-5849. [PMID: 18003343 DOI: 10.1109/iembs.2007.4353677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Thermal preconditioning induces a cytoprotective effect and promotes tissue recovering. Laser is an appropriated method to generate a controlled and reproducible heating. Bone healing, a crucial challenge in medicine, is affected by X-ray radiation which induces a chronic antiangiogenic effect. So, this study aims to investigate the role of laser preconditioning on the vascularisation of bone after X-ray radiation. An optical bone chamber allowed the study of the vascularization process. The vascular density (VD) was determined using image processing. A longitudinal study was performed on 20 rabbits divided in four groups: #1: control group (n=5); #2: laser irradiation alone (diode laser 810nm, fluence= 48J/cm2) (n=5). #3: X-ray radiation (18.75Gy) alone (n=5), #4: laser preconditioning 24 hours before a X-ray radiation (n=5). VD remained stable during 12-week follow up for groups #1 and #2. X-ray radiation lead to an important decrease of the superficial bone vascularization in group #3. The decrease of the vascularization was limited in group #4 highlighting a different evolution between group #3 and #4. Those results were confirmed by histological analysis. Our preliminary findings show that laser preconditioning preserves vascularization in X-ray radiated bone site, outlining a novel approach for the bone healing in which the vascular supply has been injured.
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Affiliation(s)
- Sophie Desmons
- INSERM French National Institute of Health and Medical Research, Pavillon Vancostenobel, Lille University Hospital CH&U, 59037 Lille Cedex, France.
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Penel G, Delfosse C, Descamps M, Leroy G. Composition of bone and apatitic biomaterials as revealed by intravital Raman microspectroscopy. Bone 2005; 36:893-901. [PMID: 15814305 DOI: 10.1016/j.bone.2005.02.012] [Citation(s) in RCA: 158] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2004] [Revised: 01/18/2005] [Accepted: 02/25/2005] [Indexed: 10/25/2022]
Abstract
Microcharacterization of biominerals allows a better understanding of the pathophysiological events that occur in calcified tissues and synthetic biomaterials. Different methods have been extensively used to conduct such investigations. A new model for the intravital study of the composition and structure of membranous bone by Raman microspectroscopy is described. Titanium bone chambers equipped with a fused-silica optical window were implanted transcutaneously in the calvaria of New Zealand rabbits. The implanted optical windows were well tolerated, and spectral acquisitions were performed without any additional invasive procedure. Bone and implanted apatitic biomaterials were analyzed at different times after surgery. All Raman bands were unambiguously identified in the bone and biomaterial spectra. The main PO4 and CO3 Raman bands in bone spectra were consistent with those found in the carbonated apatite spectrum. The major collagen bands were always observed around 1200-1300 (amide III) and 1600-1700 (amide I) delta cm(-1) and, 1400-1470 and 2800-3100 delta cm(-1) (bending and stretching modes of CH groups, respectively). The phenylalanine (Phe) band was identified in all spectra at 1003 delta cm(-1) and overlapped that of the weak HPO4(2-) ion. The CH bands frequently overlapped the lipid bands. However a distinct protein and lipid bands were detected at 2950 and 2852 delta cm(-1), respectively. In bone areas close to blood vessels, the Raman signature of hemoglobin was detected with a characteristic band at 754 delta cm(-1). The changes observed in bone varied as a function of time and location. The composition and structure of all of the biomaterials studied--including those that were resorbable--seemed to remain stable over time and location. We report for the first time the complete intravital study of Raman spectra of bone and calcium phosphate biomaterials over a period of 8 months. This new approach does not require specimen preparation and allows simultaneous observation of mineral and organic bone constituents over time, which therefore should provide insightful information about their relationship.
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Affiliation(s)
- G Penel
- LBM Raman, Faculté d'Odontologie, Université de Lille 2, Lille, France
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Penel G, Pottier EC, Leroy G. Raman investigation of calcium carbonate bone substitutes and related biomaterials. Bull Group Int Rech Sci Stomatol Odontol 2003; 45:56-9. [PMID: 15148877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
The interaction between biomaterials used in surgical procedures and the host bone is not yet perfectly understood. It appears that these problems may have been encountered because of insufficient characterisation of the basic component used in the synthesis of such biomaterials. Calcium carbonate (CaCO3) is interesting for bone filling or regeneration procedures because of its resorbability. The aim of this work is to compare different CaCO3 biomaterials and their basic source with the help of microRaman spectroscopy. Bionacre and Biocoral are analysed. The main bands of carbonate internal modes are observed around 1084-86 and 704-12 cm-1. In the lattice modes region, for both Biocoral and synthetic aragonite, two bands at 206 and 155 cm-1 are observed. The eggshell, oyster shell and synthetic calcite samples exhibit bands at 281 and 155 cm-1. Three bands are present at 280, 206 and 155 cm-1 on the Bionacre sample. The 206 and the 280 cm-1 bands are due to aragonite and calcite forms respectively. Therefore it appears to be a mixture of aragonite and calcite whereas Biocoral is pure aragonite. Additional Raman investigations should be of great interest in evaluating the structural modifications and their influence on the biological behaviour of these biomaterials. Lity index, the percentage of prematurity and of low birth weight are the indices of national health status.
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Affiliation(s)
- G Penel
- L.B.M. Micro Raman-Faculté d'Odontologie, Lille, France.
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45
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Penel G, Iost A, Libersa JC. [Cleaning implantation burs. Observations using scanning electron microscopy]. Bull Group Int Rech Sci Stomatol Odontol 2001; 43:11-3. [PMID: 11799723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Drastic aseptic conditions are necessary in implantological treatments. A good sterilizing procedure of the specific instrumentation, like drills, is based on an efficient cleaning. Because of their design, the cleaning of drills is a real challenge. The aim of this investigation is to evaluate two different cleaning procedures usually used by implantologists. One is based on a manual cleaning, the other on an ultra-sonic cleaning. The instrument observed by scan-electron-microscope, is a I.T.I. system drill. The results show the superiority of the ultra-sonic cleaning. The manual cleaning is especially ineffective on the inside and the cutting part of the drill. Even if ultra-sonic cleaning is definitely a better procedure, it has to be improved. A extensive study should be conducted to optimize the cleaning parameters, if not, single-use drill should be definitely preferred by implantologists.
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Affiliation(s)
- G Penel
- U.F.R. d'Odontologie, Service de Chirurgie Buccale du CSTD, Lille, France.
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46
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Penel G, Leroy G, Leroy N, Behin P, Langlois JM, Libersa JC, Dupas PH. [Raman spectrometry applied to calcified tissue and calcium-phosphorus biomaterials]. Bull Group Int Rech Sci Stomatol Odontol 2000; 42:55-63. [PMID: 11799728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The rigid part of the human body consists essentially of carbonated apatite (calcium phosphate). Biologists don't have any tools to study this "mineral" phase, though its origin is organic. A new approach of some compounds like enamel or bone is obtained with the Raman micro-characterisation by a very fine analysis of chemical bonds in a micrometric scale. This method allows the characterisation, the analysis and the dosage of ions, like carbonate, acid phosphates, proteins and fatty acids. The identification of other organic or mineral compounds (e.g. calcium carbonate, calcium oxide, substitutant ions...) is also possible. The Raman microspectrometry can also be used to study the chemical and physical properties of biomaterials and their evolution after implantation in a dental or bone site. On synthetical calcium phosphate, beta-TCP, brushite and hydroxyapatite can be distinguished and the impurities found in plasma spray deposits can be measured. The detection of alpha-, beta-, or gamma-pyrophosphates could be obtained in some commercial beta-TCP. The Raman microspectrometry is the only non-destructive method which allows the identification of the chemical bonds in a micrometric scale and gives the "fingerprint" of the studied component.
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Affiliation(s)
- G Penel
- LBM Raman-Faculté d'odontologie, Lille, France.
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47
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Abstract
Calcium phosphate hydraulic cements are promising synthetic bone grafting materials. Brushite-based cements were implanted for 6 and 12 months in the distal condyle of sheep femur, and their in vivo evolution was investigated by Raman microspectrometry. This new technique can probe small volumes in the cubic micrometer range. Its resolution allows a very fine analysis of crystalline changes in calcium phosphate mixtures at the microscopic level. First, Raman spectra of pure brushite, monetite, and beta-tricalcium phosphate (beta-TCP) were recorded, in order to set a data base for the basic components of brushite cements. These spectra show significant differences in the vibration mode v1 for the phosphate ion (988 and 878 cm(-1) for brushite, 988 and 900 cm(-1) for monetite, 968 and 948 cm(-1) for beta-TCP). These differences are strong enough as to allow the qualitative and quantitative analysis of these crystalline phases in the cement. Implanted sheep femur samples were harvested after 24 and 52 weeks post-op, and prepared for Raman analysis in the form of 1-mm-thick sections. Implants at 24 weeks show a core of residual cement isolated from the surrounding bone by fibroconnective tissue. No trace of brushite was detected by micro-Raman analysis in this area, but instead, a mixture of beta-TCP and Type-B carbonated apatite, the latter being very close in composition and structure to the mineral fraction of normal bone in the vicinity of the implant. Implants recovered after 52 weeks show a decrease of the bone/residual cement perimeter, whereas new trabeculations are formed in the implanted zone; the small amounts of residual cement still present are substantially transformed into Type-B carbonated apatite containing small amounts of proteins. In the same area, some beta-TCP particles are also detected showing that, contrary to brushite, the excess beta-TCP originally present in the cement is not completely metabolized. In the implanted zone already converted into trabecular bone, Raman microspectrometry shows the characteristic spectrum of normal bone.
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Affiliation(s)
- G Penel
- Laboratoire de Biomatériaux Microspectrométrie Raman, Faculté d'Odontologie, Lille, France.
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Abstract
The carbonate and phosphate vibrational modes of different synthetic and biological carbonated apatites were investigated by Raman microspectroscopy, and compared with those of hydroxyapatite. The nu1 phosphate band at 960 cm-1 shifts slightly due to carbonate substitution in both A and B sites. The spectrum of type A carbonated apatite exhibits two nu1 PO43- bands at 947 and 957 cm-1. No significant change was observed in the nu2 and nu4 phosphate mode regions in any carbonated samples. The nu3 PO43- region seems to be more affected by carbonation: two main bands were observed, as in the hydroxyapatite spectrum, but at lower wave numbers. The phosphate spectra of all biominerals apatite were consistent with type AB carbonated apatite. In the enamel spectrum, bands were observed at 3513 and at 3573 cm-1 presumably due to two different hydroxyl environments. Two different bands due to the carbonate nu1 mode were identified depending on the carbonate substitution site A or B, at 1107 and 1070 cm-1, respectively. Our results, compared with the infrared data already reported, suggest that even low levels of carbonate substitution induce modifications of the hydroxyapatite spectrum. Increasing substitution ratios, however, do not bring about any further alteration. The spectra of dentine and bone showed a strong similarity at a micrometric level. This study demonstrates the existence of acidic phosphate, observable by Raman microspectrometry, in mature biominerals. The HPO42- and CO32- contents increase from enamel to dentine and bone, however, these two phenomena do not seem to be correlated.
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Affiliation(s)
- G Penel
- L.B.M.-Microspectrométrie Raman faculté d'Odontologie, Place de Verdun 59045 Lille, France
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Penel G, Leroy G, Rey C, Sombret B, Huvenne JP, Bres E. Infrared and Raman microspectrometry study of fluor-fluor-hydroxy and hydroxy-apatite powders. J Mater Sci Mater Med 1997; 8:271-6. [PMID: 15348748 DOI: 10.1023/a:1018504126866] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Visible Raman and infrared microspectrometry studies performed on fluorapatite and hydroxyapatite powders have shown similar results. Small modifications of the nu2 and nu4 PO(3-)4 tetrahedra bending modes are observed. A small frequency shift of the nu1 mode and modifications on the nu3 mode region accompanied with a simplification of the hydroxyapatite and fluorapatite respective spectra from seven to four bands were observed. A broad and weak band which could be attributed to the Ca-F bond is detected at 311 cm(-1) on the Raman fluorapatite spectra. The phosphate vibration modes are little disturbed by fluoride substitution. This could indicate that phosphate groups interact strongly between themselves and weakly with substituted atoms (i.e. hydroxyle and fluoride atoms). Whatever crystallographic model is considered, the number of bands observed is always lower than the number of calculated ones, even for hydroxyapatite, whose symmetry is lower than that of fluorapatite.
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Affiliation(s)
- G Penel
- Laboratoire d'Anatomie bucco-dentaire, Université de Lille II, UFR de Chirurgie-Dentaire, France
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