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Vadon-Le Goff S, Tessier A, Napoli M, Dieryckx C, Bauer J, Dussoyer M, Lagoutte P, Peyronnel C, Essayan L, Kleiser S, Tueni N, Bettler E, Mariano N, Errazuriz-Cerda E, Fruchart Gaillard C, Ruggiero F, Becker-Pauly C, Allain JM, Bruckner-Tuderman L, Nyström A, Moali C. Identification of PCPE-2 as the endogenous specific inhibitor of human BMP-1/tolloid-like proteinases. Nat Commun 2023; 14:8020. [PMID: 38049428 PMCID: PMC10696041 DOI: 10.1038/s41467-023-43401-0] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 11/08/2023] [Indexed: 12/06/2023] Open
Abstract
BMP-1/tolloid-like proteinases (BTPs) are major players in tissue morphogenesis, growth and repair. They act by promoting the deposition of structural extracellular matrix proteins and by controlling the activity of matricellular proteins and TGF-β superfamily growth factors. They have also been implicated in several pathological conditions such as fibrosis, cancer, metabolic disorders and bone diseases. Despite this broad range of pathophysiological functions, the putative existence of a specific endogenous inhibitor capable of controlling their activities could never be confirmed. Here, we show that procollagen C-proteinase enhancer-2 (PCPE-2), a protein previously reported to bind fibrillar collagens and to promote their BTP-dependent maturation, is primarily a potent and specific inhibitor of BTPs which can counteract their proteolytic activities through direct binding. PCPE-2 therefore differs from the cognate PCPE-1 protein and extends the possibilities to fine-tune BTP activities, both in physiological conditions and in therapeutic settings.
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Affiliation(s)
- Sandrine Vadon-Le Goff
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Agnès Tessier
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
- Department of Dermatology, Medical Faculty, Medical Center - University of Freiburg, 79104, Freiburg, Germany
- University of Freiburg, Faculty of Biology, 79104, Freiburg, Germany
| | - Manon Napoli
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Cindy Dieryckx
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Julien Bauer
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Mélissa Dussoyer
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Priscillia Lagoutte
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Célian Peyronnel
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Lucie Essayan
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Svenja Kleiser
- Department of Dermatology, Medical Faculty, Medical Center - University of Freiburg, 79104, Freiburg, Germany
- University of Freiburg, Faculty of Biology, 79104, Freiburg, Germany
| | - Nicole Tueni
- Laboratoire de Mécanique des Solides, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91120, Palaiseau, France
- INRIA, 91120, Palaiseau, France
- Institute of Applied Mechanics, Department of Mechanical Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Emmanuel Bettler
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Natacha Mariano
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France
| | - Elisabeth Errazuriz-Cerda
- University of Lyon, Centre d'Imagerie Quantitative Lyon-Est (CIQLE), SFR Santé-Lyon Est, 69373, Lyon, France
| | - Carole Fruchart Gaillard
- Université Paris-Saclay, CEA, INRAE, Médicaments et Technologies pour la Santé (MTS), SIMoS, 91191, Gif-sur-Yvette, France
| | - Florence Ruggiero
- ENS Lyon, CNRS UMR 5242, Institut de Génomique Fonctionnelle de Lyon (IGFL), 69007, Lyon, France
| | - Christoph Becker-Pauly
- University of Kiel, Biochemical Institute, Unit for Degradomics of the Protease Web, Kiel, Germany
| | - Jean-Marc Allain
- Laboratoire de Mécanique des Solides, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91120, Palaiseau, France
- INRIA, 91120, Palaiseau, France
| | - Leena Bruckner-Tuderman
- Department of Dermatology, Medical Faculty, Medical Center - University of Freiburg, 79104, Freiburg, Germany
| | - Alexander Nyström
- Department of Dermatology, Medical Faculty, Medical Center - University of Freiburg, 79104, Freiburg, Germany
- Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Freiburg, Germany
| | - Catherine Moali
- University of Lyon, CNRS UMR5305, Tissue Biology and Therapeutic Engineering Laboratory (LBTI), 69367, Lyon, France.
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Godefroy W, Faivre L, Sansac C, Thierry B, Allain JM, Bruneval P, Agniel R, Kellouche S, Monasson O, Peroni E, Jarraya M, Setterblad N, Braik M, Even B, Cheverry S, Domet T, Albanese P, Larghero J, Cattan P, Arakelian L. Development and qualification of clinical grade decellularized and cryopreserved human esophagi. Sci Rep 2023; 13:18283. [PMID: 37880340 PMCID: PMC10600094 DOI: 10.1038/s41598-023-45610-5] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 10/21/2023] [Indexed: 10/27/2023] Open
Abstract
Tissue engineering is a promising alternative to current full thickness circumferential esophageal replacement methods. The aim of our study was to develop a clinical grade Decellularized Human Esophagus (DHE) for future clinical applications. After decontamination, human esophagi from deceased donors were placed in a bioreactor and decellularized with sodium dodecyl sulfate (SDS) and ethylendiaminetetraacetic acid (EDTA) for 3 days. The esophagi were then rinsed in sterile water and SDS was eliminated by filtration on an activated charcoal cartridge for 3 days. DNA was removed by a 3-hour incubation with DNase. A cryopreservation protocol was evaluated at the end of the process to create a DHE cryobank. The decellularization was efficient as no cells and nuclei were observed in the DHE. Sterility of the esophagi was obtained at the end of the process. The general structure of the DHE was preserved according to immunohistochemical and scanning electron microscopy images. SDS was efficiently removed, confirmed by a colorimetric dosage, lack of cytotoxicity on Balb/3T3 cells and mesenchymal stromal cell long term culture. Furthermore, DHE did not induce lymphocyte proliferation in-vitro. The cryopreservation protocol was safe and did not affect the tissue, preserving the biomechanical properties of the DHE. Our decellularization protocol allowed to develop the first clinical grade human decellularized and cryopreserved esophagus.
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Affiliation(s)
- William Godefroy
- Service de Chirurgie Viscérale, Cancérologique et Endocrinienne, Hôpital Saint-Louis - Université Paris Cité, Paris, France.
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France.
- CIC de Biothérapies CBT 501, Paris, France.
- Human Immunology, Pathophysiology, Immunotherapy / HIPI / INSERM UMR976, Laboratoire de Biotechnologies de Cellules Souches, Université Paris Cité, 75010, Paris, France.
| | - Lionel Faivre
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France
- CIC de Biothérapies CBT 501, Paris, France
- Human Immunology, Pathophysiology, Immunotherapy / HIPI / INSERM UMR976, Laboratoire de Biotechnologies de Cellules Souches, Université Paris Cité, 75010, Paris, France
| | - Caroline Sansac
- Banque de Tissus Humains, Hôpital St-Louis, AP-HP, Paris, France
| | - Briac Thierry
- Human Immunology, Pathophysiology, Immunotherapy / HIPI / INSERM UMR976, Laboratoire de Biotechnologies de Cellules Souches, Université Paris Cité, 75010, Paris, France
- Service d'ORL Pédiatrique, AP-HP, Hôpital Universitaire Necker, 75015, Paris, France
| | - Jean-Marc Allain
- LMS, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
- Inria, Paris, France
| | - Patrick Bruneval
- Service d'Anatomie Pathologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France
| | - Rémy Agniel
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des Matériaux, I-MAT (FD4122), CY Cergy Paris Université, Cergy-Pontoise, France
| | - Sabrina Kellouche
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe (EA1391), Institut des Matériaux, I-MAT (FD4122), CY Cergy Paris Université, Cergy-Pontoise, France
| | - Olivier Monasson
- CNRS, BioCIS, CY Cergy Paris Université, 95000, Cergy Pontoise, France
- CNRS, BioCIS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - Elisa Peroni
- CNRS, BioCIS, CY Cergy Paris Université, 95000, Cergy Pontoise, France
- CNRS, BioCIS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - Mohamed Jarraya
- Banque de Tissus Humains, Hôpital St-Louis, AP-HP, Paris, France
| | - Niclas Setterblad
- UMS Saint-Louis US53 / UAR2030, Institut de Recherche Saint-Louis Plateforme Technologique Centre, Université Paris Cité - Inserm - CNRS, Paris, France
| | - Massymissa Braik
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France
| | - Benjamin Even
- Laboratoire Gly-CRRET, Université Paris Est Créteil, Université Paris Est, EA 4397 ERL CNRS 9215, Créteil, France
| | - Sophie Cheverry
- Laboratoire Gly-CRRET, Université Paris Est Créteil, Université Paris Est, EA 4397 ERL CNRS 9215, Créteil, France
| | - Thomas Domet
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France
- CIC de Biothérapies CBT 501, Paris, France
| | - Patricia Albanese
- Laboratoire Gly-CRRET, Université Paris Est Créteil, Université Paris Est, EA 4397 ERL CNRS 9215, Créteil, France
| | - Jérôme Larghero
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France
- CIC de Biothérapies CBT 501, Paris, France
- Human Immunology, Pathophysiology, Immunotherapy / HIPI / INSERM UMR976, Laboratoire de Biotechnologies de Cellules Souches, Université Paris Cité, 75010, Paris, France
- Centre MEARY de Thérapie Cellulaire Et Génique, AP-HP, Hôpital Saint-Louis, 75010, Paris, France
| | - Pierre Cattan
- Service de Chirurgie Viscérale, Cancérologique et Endocrinienne, Hôpital Saint-Louis - Université Paris Cité, Paris, France
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France
- CIC de Biothérapies CBT 501, Paris, France
- Human Immunology, Pathophysiology, Immunotherapy / HIPI / INSERM UMR976, Laboratoire de Biotechnologies de Cellules Souches, Université Paris Cité, 75010, Paris, France
| | - Lousineh Arakelian
- Unité de Thérapie Cellulaire, Hôpital Saint-Louis, AP-HP, Paris, France.
- CIC de Biothérapies CBT 501, Paris, France.
- Human Immunology, Pathophysiology, Immunotherapy / HIPI / INSERM UMR976, Laboratoire de Biotechnologies de Cellules Souches, Université Paris Cité, 75010, Paris, France.
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Wolff-Trombini L, Ceripa A, Moreau J, Galinat H, James C, Westbrook N, Allain JM. Microrheology and structural quantification of hypercoagulable clots. Biomed Opt Express 2023; 14:4179-4189. [PMID: 37799698 PMCID: PMC10549726 DOI: 10.1364/boe.492669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 06/29/2023] [Accepted: 06/30/2023] [Indexed: 10/07/2023]
Abstract
Hypercoagulability is a pathology that remains difficult to explain today in most cases. It is likely due to a modification of the conditions of polymerization of the fibrin, the main clot component. Using passive microrheology, we measured the mechanical properties of clots and correlated them under the same conditions with structural information obtained with confocal microscopy. We tested our approach with known alterations: an excess of fibrinogen and of coagulation Factor VIII. We observed simultaneously a rigidification and densification of the fibrin network, showing the potential of microrheology for hypercoagulability diagnosis.
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Affiliation(s)
- Laura Wolff-Trombini
- Université de Bordeaux, UMR1034, Inserm, Biology of Cardiovascular Diseases, Pessac, France
| | - Adrien Ceripa
- LMS, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
- Inria, Palaiseau, France
| | - Julien Moreau
- Université Paris-Saclay, Institut d’Optique Graduate School, CNRS, Laboratoire Charles Fabry, Palaiseau, France
| | - Hubert Galinat
- CHU de Brest, Service d'Hématologie Biologique, Brest, France
| | - Chloe James
- Université de Bordeaux, UMR1034, Inserm, Biology of Cardiovascular Diseases, Pessac, France
- CHU de Bordeaux, Laboratoire d’Hématologie, Pessac, France
| | - Nathalie Westbrook
- Université Paris-Saclay, Institut d’Optique Graduate School, CNRS, Laboratoire Charles Fabry, Palaiseau, France
| | - Jean-Marc Allain
- LMS, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
- Inria, Palaiseau, France
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4
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Lefevre E, Baron C, Gineyts E, Bala Y, Gharbi H, Allain JM, Lasaygues P, Pithioux M, Follet H. Ultrasounds could be considered as a future tool for probing growing bone properties. Sci Rep 2020; 10:15698. [PMID: 32973276 PMCID: PMC7518273 DOI: 10.1038/s41598-020-72776-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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] [Received: 02/28/2020] [Accepted: 08/26/2020] [Indexed: 11/30/2022] Open
Abstract
Juvenile bone growth is well described (physiological and anatomical) but there are still lacks of knowledge on intrinsic material properties. Our group has already published, on different samples, several studies on the assessment of intrinsic material properties of juvenile bone compared to material properties of adult bone. The purpose of this study was finally to combine different experimental modalities available (ultrasonic measurement, micro-Computed Tomography analysis, mechanical compression tests and biochemical measurements) applied on small cubic bone samples in order to gain insight into the multiparametric evaluation of bone quality. Differences were found between juvenile and adult groups in term of architectural parameters (Porosity Separation), Tissue Mineral Density (TMD), diagonal stiffness coefficients (C33, C44, C55, C66) and ratio between immature and mature cross-links (CX). Diagonal stiffness coefficients are more representative of the microstructural and biochemical parameters of child bone than of adult bone. We also found that compression modulus E was highly correlated with several microstructure parameters and CX in children group while it was not at all correlated in the adult group. Similar results were found for the CX which was linked to several microstructure parameters (TMD and E) only in the juvenile group. To our knowledge, this is the first time that, on a same sample, ultrasonic measurements have been combined with the assessment of mechanical and biochemical properties. It appears that ultrasonic measurements can provide relevant indicators of child bone quality (microstructural and biochemical parameters) which is promising for clinical application since, B-mode ultrasound is the preferred first-line modality over other more constraining imaging modalities (radiation, parent–child accessibility and access to the patient's bed) for pediatric patients.
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Affiliation(s)
- Emmanuelle Lefevre
- Aix Marseille Univ, CNRS,ISM, Marseille, France.,Aix Marseille Univ, APHM,CNRS, ISM, Sainte-Marguerite Hospital, Institute for Locomotion, Department of Orthopaedics and Traumatology, Marseille, France
| | - Cécile Baron
- Aix Marseille Univ, CNRS,ISM, Marseille, France.,Aix Marseille Univ, APHM,CNRS, ISM, Sainte-Marguerite Hospital, Institute for Locomotion, Department of Orthopaedics and Traumatology, Marseille, France
| | - Evelyne Gineyts
- Univ Lyon, Univ Claude Bernard Lyon 1, INSERM, LYOS UMR1033, F69008, Lyon, France
| | - Yohann Bala
- Univ Lyon, Univ Claude Bernard Lyon 1, INSERM, LYOS UMR1033, F69008, Lyon, France.,Laboratoire Vibrations Acoustique, INSA Lyon, Campus LyonTech la Doua, Villeurbanne, France
| | - Hakim Gharbi
- LMS, Ecole Polytechnique,CNRS, Institut Polytechnique de Paris, Palaiseau, France
| | - Jean-Marc Allain
- LMS, Ecole Polytechnique,CNRS, Institut Polytechnique de Paris, Palaiseau, France.,Inria, Palaiseau, France
| | | | - Martine Pithioux
- Aix Marseille Univ, CNRS,ISM, Marseille, France.,Aix Marseille Univ, APHM,CNRS, ISM, Sainte-Marguerite Hospital, Institute for Locomotion, Department of Orthopaedics and Traumatology, Marseille, France
| | - Hélène Follet
- Univ Lyon, Univ Claude Bernard Lyon 1, INSERM, LYOS UMR1033, F69008, Lyon, France.
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Frachisse JM, Thomine S, Allain JM. Calcium and plasma membrane force-gated ion channels behind development. Curr Opin Plant Biol 2020; 53:57-64. [PMID: 31783322 DOI: 10.1016/j.pbi.2019.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/17/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
During development, tissues are submitted to high variation of compression and tension forces. The roles of the cell wall, the cytoskeleton, the turgor pressure and the cell geometry during this process have received due attention. In contrast, apart from its role in the establishment of turgor pressure, the involvement of the plasma membrane as a transducer of mechanical forces during development has been under studied. Force-gated (FG) or Mechanosensitive (MS) ion channels embedded in the bilayer represent 'per se' archetypal mechanosensor able to directly and instantaneously transduce membrane forces into electrical and calcium signals. We discuss here how their fine-tuning, combined with their ability to detect micro-curvature and local membrane tension, allows FG channels to transduce mechanical cues into developmental signals.
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Affiliation(s)
- Jean-Marie Frachisse
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Sciences Plant Saclay, 91198 Gif sur Yvette Cedex, France.
| | - Sébastien Thomine
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Sciences Plant Saclay, 91198 Gif sur Yvette Cedex, France
| | - Jean-Marc Allain
- LMS, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France; Inria, Palaiseau, France.
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6
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Guichard M, Allain JM, Wolfe Bianchi M, Frachisse JM. Root Hair Sizer: an algorithm for high throughput recovery of different root hair and root developmental parameters. Plant Methods 2019; 15:104. [PMID: 31507646 PMCID: PMC6724272 DOI: 10.1186/s13007-019-0483-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 08/13/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND The root is an important organ for water and nutrient uptake, and soil anchorage. It is equipped with root hairs (RHs) which are elongated structures increasing the exchange surface with the soil. RHs are also studied as a model for plant cellular development, as they represent a single cell with specific and highly regulated polarized elongation. For these reasons, it is useful to be able to accurately quantify RH length employing standardized procedures. Methods commonly employed rely on manual steps and are therefore time consuming and prone to errors, restricting analysis to a short segment of the root tip. Few partially automated methods have been reported to increase measurement efficiency. However, none of the reported methods allow an accurate and standardized definition of the position along the root for RH length measurement, making data comparison difficult. RESULTS We developed an image analysis algorithm that semi-automatically detects RHs and measures their length along the whole differentiation zone of roots. This method, implemented as a simple automated script in ImageJ/Fiji software that we termed Root Hair Sizer, slides a rectangular window along a binarized and straightened image of root tips to estimate the maximal RH length in a given measuring interval. This measure is not affected by heavily bent RHs and any bald spots. RH length data along the root are then modelled with a sigmoidal curve, generating several biologically significant parameters such as RH length, positioning of the root differentiation zone and, under certain conditions, RH growth rate. CONCLUSIONS Image analysis with Root Hair Sizer and subsequent sigmoidal modelling of RH length data provide a simple and efficient way to characterize RH growth in different conditions, equally suitable to small and large scale phenotyping experiments.
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Affiliation(s)
- Marjorie Guichard
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Sciences Plant Saclay, 91198 Gif sur Yvette Cedex, France
- Present Address: Centre for Organismal Studies (COS), Universität Heidelberg, Im Neuenheimer Feld 230, 69120 Heidelberg, Germany
| | - Jean-Marc Allain
- LMS, Ecole Polytechnique, CNRS, Palaiseau, France
- Inria, Université Paris-Saclay, Palaiseau, France
| | - Michele Wolfe Bianchi
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Sciences Plant Saclay, 91198 Gif sur Yvette Cedex, France
- Unité de Formation et de Recherche Sciences et Technologie, Université Paris-Est Créteil Val de Marne, 94010 Créteil, France
| | - Jean-Marie Frachisse
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Sciences Plant Saclay, 91198 Gif sur Yvette Cedex, France
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Ducourthial G, Affagard JS, Schmeltz M, Solinas X, Lopez-Poncelas M, Bonod-Bidaud C, Rubio-Amador R, Ruggiero F, Allain JM, Beaurepaire E, Schanne-Klein MC. Monitoring dynamic collagen reorganization during skin stretching with fast polarization-resolved second harmonic generation imaging. J Biophotonics 2019; 12:e201800336. [PMID: 30604478 DOI: 10.1002/jbio.201800336] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 12/04/2018] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
The mechanical properties of biological tissues are strongly correlated to the specific distribution of their collagen fibers. Monitoring the dynamic reorganization of the collagen network during mechanical stretching is however a technical challenge, because it requires mapping orientation of collagen fibers in a thick and deforming sample. In this work, a fast polarization-resolved second harmonic generation microscope is implemented to map collagen orientation during mechanical assays. This system is based on line-to-line switching of polarization using an electro-optical modulator and works in epi-detection geometry. After proper calibration, it successfully highlights the collagen dynamic alignment along the traction direction in ex vivo murine skin dermis. This microstructure reorganization is quantified by the entropy of the collagen orientation distribution as a function of the stretch ratio. It exhibits a linear behavior, whose slope is measured with a good accuracy. This approach can be generalized to probe a variety of dynamic processes in thick tissues.
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Affiliation(s)
| | | | | | - Xavier Solinas
- LOB, École Polytechnique, CNRS, INSERM, Palaiseau, France
| | | | - Christelle Bonod-Bidaud
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | - Ruth Rubio-Amador
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | - Florence Ruggiero
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | - Jean-Marc Allain
- LMS, École Polytechnique, CNRS, Palaiseau, France
- Inria, Université Paris-Saclay, Palaiseau, France
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8
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Even C, Marlière C, Ghigo JM, Allain JM, Marcellan A, Raspaud E. Recent advances in studying single bacteria and biofilm mechanics. Adv Colloid Interface Sci 2017; 247:573-588. [PMID: 28754382 DOI: 10.1016/j.cis.2017.07.026] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 07/18/2017] [Accepted: 07/18/2017] [Indexed: 12/15/2022]
Abstract
Bacterial biofilms correspond to surface-associated bacterial communities embedded in hydrogel-like matrix, in which high cell density, reduced diffusion and physico-chemical heterogeneity play a protective role and induce novel behaviors. In this review, we present recent advances on the understanding of how bacterial mechanical properties, from single cell to high-cell density community, determine biofilm tri-dimensional growth and eventual dispersion and we attempt to draw a parallel between these properties and the mechanical properties of other well-studied hydrogels and living systems.
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9
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Lynch B, Bancelin S, Bonod-Bidaud C, Gueusquin JB, Ruggiero F, Schanne-Klein MC, Allain JM. A novel microstructural interpretation for the biomechanics of mouse skin derived from multiscale characterization. Acta Biomater 2017; 50:302-311. [PMID: 28043893 DOI: 10.1016/j.actbio.2016.12.051] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [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: 06/30/2016] [Revised: 11/15/2016] [Accepted: 12/29/2016] [Indexed: 11/17/2022]
Abstract
Skin is a complex, multi-layered organ, with important functions in the protection of the body. The dermis provides structural support to the epidermal barrier, and thus has attracted a large number of mechanical studies. As the dermis is made of a mixture of stiff fibres embedded in a soft non-fibrillar matrix, it is classically considered that its mechanical response is based on an initial alignment of the fibres, followed by the stretching of the aligned fibres. Using a recently developed set-up combining multiphoton microscopy with mechanical assay, we imaged the fibres network evolution during dermis stretching. These observations, combined with a wide set of mechanical tests, allowed us to challenge the classical microstructural interpretation of the mechanical properties of the dermis: we observed a continuous alignment of the collagen fibres along the stretching. All our results can be explained if each fibre contributes by a given stress to the global response. This plastic response is likely due to inner sliding inside each fibre. The non-linear mechanical response is due to structural effects of the fibres network in interaction with the surrounding non-linear matrix. This multiscale interpretation explains our results on genetically-modified mice with a simple alteration of the dermis microstructure. STATEMENT OF SIGNIFICANCE Soft tissues, as skin, tendon or aorta, are made of extra-cellular matrix, with very few cells embedded inside. The matrix is a mixture of water and biomolecules, which include the collagen fibre network. The role of the collagen is fundamental since the network is supposed to control the tissue mechanical properties and remodeling: the cells attach to the collagen fibres and feel the network deformations. This paper challenges the classical link between fibres organization and mechanical properties. To do so, it uses multiscale observations combined to a large set of mechanical loading. It thus appears that the behaviour at low stretches is mostly controlled by the network structural response, while, at large stretches, the fibre inner-sliding dominate.
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Affiliation(s)
- Barbara Lynch
- LMS, Ecole Polytechnique, CNRS, Université Paris-Saclay, Palaiseau, France
| | - Stéphane Bancelin
- LOB, Ecole Polytechnique, CNRS, INSERM, Université Paris-Saclay, Palaiseau, France
| | - Christelle Bonod-Bidaud
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | | | - Florence Ruggiero
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS, Université de Lyon, Lyon, France
| | | | - Jean-Marc Allain
- LMS, Ecole Polytechnique, CNRS, Université Paris-Saclay, Palaiseau, France; Inria, Université Paris-Saclay, Palaiseau, France.
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10
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Nguyen MT, Allain JM, Gharbi H, Desceliers C, Soize C. Experimental multiscale measurements for the mechanical identification of a cortical bone by digital image correlation. J Mech Behav Biomed Mater 2016; 63:125-133. [PMID: 27348148 DOI: 10.1016/j.jmbbm.2016.06.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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: 03/23/2016] [Revised: 06/03/2016] [Accepted: 06/09/2016] [Indexed: 11/16/2022]
Abstract
The implementation of the experimental methodology by optical measurements of mechanical fields, the development of a test bench, the specimen preparation, the experimental measurements, and the digital image correlation (DIC) method, have already been the object of research in the context of biological materials. Nevertheless, in the framework of the experimental identification of a mesoscopic stochastic model of the random apparent elasticity field, measurements of one specimen is required at both the macroscopic scale and the mesoscopic scale under one single loading. The nature of the cortical bone induces some difficulties, as no single speckled pattern technique is available for simultaneously obtaining the displacement at the macroscopic scale and at the mesoscopic scale. In this paper, we present a multiscale experimental methodology based on (i) an experimental protocol for one specimen of a cortical bone, (ii) its measuring bench, (iii) optical field measurements by DIC method, (iv) the experimental results, and (v) the multiscale experimental identification by solving a statistical inverse problem.
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Affiliation(s)
- Manh-Tu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi-Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-La-Vallée, Cedex 2, France
| | - Jean-Marc Allain
- Ecole Polytechnique, Laboratoire de Mécanique des Solides, 91128, Palaiseau cedex, France
| | - Hakim Gharbi
- Ecole Polytechnique, Laboratoire de Mécanique des Solides, 91128, Palaiseau cedex, France
| | - Christophe Desceliers
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi-Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-La-Vallée, Cedex 2, France
| | - Christian Soize
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi-Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-La-Vallée, Cedex 2, France.
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11
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Hollenbeck EC, Douarche C, Allain JM, Roger P, Regeard C, Cegelski L, Fuller GG, Raspaud E. Mechanical Behavior of a Bacillus subtilis Pellicle. J Phys Chem B 2016; 120:6080-8. [PMID: 27046510 DOI: 10.1021/acs.jpcb.6b02074] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Bacterial biofilms consist of a complex network of biopolymers embedded with microorganisms, and together these components form a physically robust structure that enables bacteria to grow in a protected environment. This structure can help unwanted biofilms persist in situations ranging from chronic infection to the biofouling of industrial equipment, but under certain circumstances it can allow the biofilm to disperse and colonize new niches. Mechanical properties are therefore a key aspect of biofilm life. In light of the recently discovered growth-induced compressive stress present within a biofilm, we studied the mechanical behavior of Bacillus subtilis pellicles, or biofilms at the air-liquid interface, and tracked simultaneously the force response and macroscopic structural changes during elongational deformations. We observed that pellicles behaved viscoelastically in response to small deformations, such that the growth-induced compressive stress was still present, and viscoplastically at large deformations, when the pellicles were under tension. In addition, by using particle imaging velocimetry we found that the pellicle deformations were nonaffine, indicating heterogeneous mechanical properties with the pellicle being more pliable near attachment surfaces. Overall, our results indicate that we must consider not only the viscoelastic but also the viscoplastic and mechanically heterogeneous nature of these structures to understand biofilm dispersal and removal.
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Affiliation(s)
- Emily C Hollenbeck
- Department of Chemical Engineering, Stanford University , Stanford, California 94305, United States
| | - Carine Douarche
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay , Orsay, France
| | - Jean-Marc Allain
- Laboratoire de Mécanique des Solides, École Polytechnique, CNRS, Université Paris-Saclay , Palaiseau, France
| | - Philippe Roger
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris-Sud, Université Paris-Saclay , Orsay, France
| | - Christophe Regeard
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay , Gif sur Yvette, France
| | - Lynette Cegelski
- Department of Chemistry, Stanford University , Stanford, California 94305, United States
| | - Gerald G Fuller
- Department of Chemical Engineering, Stanford University , Stanford, California 94305, United States
| | - Eric Raspaud
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay , Orsay, France
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12
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Benoit A, Latour G, Marie-Claire SK, Allain JM. Simultaneous microstructural and mechanical characterization of human corneas at increasing pressure. J Mech Behav Biomed Mater 2015; 60:93-105. [PMID: 26773650 DOI: 10.1016/j.jmbbm.2015.12.031] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [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: 07/20/2015] [Revised: 09/23/2015] [Accepted: 12/22/2015] [Indexed: 11/24/2022]
Abstract
The cornea, through its shape, is the main contributor to the eye׳s focusing power. Pathological alterations of the cornea strongly affect the eye power. To improve treatments, complex biomechanical models have been developed based on the architecture and mechanical properties of the collagen network in the stroma, the main layer of the cornea. However, direct investigations of the structure of the stroma, as well as its link to the mechanical response, remained limited. We propose here an original set up, associating nonlinear optical imaging and mechanical testing. By using polarization resolved Second Harmonic signals, we simultaneously quantified micrometer (orientation of the collagen lamellae) and nanometer (local disorder within lamellae) scale corneal organization. We showed that the organization of the lamellae changes along the stroma thickness. Then, we measured simultaneously the deformation on the epithelial side of the cornea and the reorientation of the collagen lamellae for increasing intraocular pressure levels, from physiological ones to pathological ones. We showed that the observed deformation is not correlated to initial orientation, but to the reorganization of the lamellae in the stroma. Our results, by providing a direct multi-scale observation, will be useful for the development of more accurate biomechanical models.
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Affiliation(s)
- Aurélie Benoit
- LMS, École polytechnique, CNRS, Université Paris-Saclay, 91128 Palaiseau, France
| | - Gaël Latour
- LOB, École polytechnique, CNRS, Inserm U1128, Université Paris-Saclay, 91128 Palaiseau cedex, France; IMNC, Univ. Paris-Sud, Univ. Paris-Diderot, CNRS, Université Paris-Saclay, 91405 Orsay cedex, France
| | | | - Jean-Marc Allain
- LMS, École polytechnique, CNRS, Université Paris-Saclay, 91128 Palaiseau, France.
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13
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Bancelin S, Lynch B, Bonod-Bidaud C, Ducourthial G, Psilodimitrakopoulos S, Dokládal P, Allain JM, Schanne-Klein MC, Ruggiero F. Ex vivo multiscale quantitation of skin biomechanics in wild-type and genetically-modified mice using multiphoton microscopy. Sci Rep 2015; 5:17635. [PMID: 26631592 PMCID: PMC4668561 DOI: 10.1038/srep17635] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [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: 07/23/2015] [Accepted: 11/02/2015] [Indexed: 02/02/2023] Open
Abstract
Soft connective tissues such as skin, tendon or cornea are made of about 90% of extracellular matrix proteins, fibrillar collagens being the major components. Decreased or aberrant collagen synthesis generally results in defective tissue mechanical properties as the classic form of Elhers-Danlos syndrome (cEDS). This connective tissue disorder is caused by mutations in collagen V genes and is mainly characterized by skin hyperextensibility. To investigate the relationship between the microstructure of normal and diseased skins and their macroscopic mechanical properties, we imaged and quantified the microstructure of dermis of ex vivo murine skin biopsies during uniaxial mechanical assay using multiphoton microscopy. We used two genetically-modified mouse lines for collagen V: a mouse model for cEDS harboring a Col5a2 deletion (a.k.a. pN allele) and the transgenic K14-COL5A1 mice which overexpress the human COL5A1 gene in skin. We showed that in normal skin, the collagen fibers continuously align with stretch, generating the observed increase in mechanical stress. Moreover, dermis from both transgenic lines exhibited altered collagen reorganization upon traction, which could be linked to microstructural modifications. These findings show that our multiscale approach provides new crucial information on the biomechanics of dermis that can be extended to all collagen-rich soft tissues.
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Affiliation(s)
- Stéphane Bancelin
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS, INSERM U1182, 91128 Palaiseau Cedex, FRANCE
| | - Barbara Lynch
- Solids Mechanics Laboratory Ecole Polytechnique, CNRS, Mines ParisTech, 91128 Palaiseau Cedex, FRANCE
| | - Christelle Bonod-Bidaud
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS UMR 5242, Université Lyon 1, 46 Allée d'Italie, 69364 Lyon, cedex 07 France
| | - Guillaume Ducourthial
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS, INSERM U1182, 91128 Palaiseau Cedex, FRANCE
| | | | - Petr Dokládal
- Centre for Mathematical Morphology, MINES ParisTech, PSL Research University, 35 rue St Honoré, 77300 Fontainebleau, France
| | - Jean-Marc Allain
- Solids Mechanics Laboratory Ecole Polytechnique, CNRS, Mines ParisTech, 91128 Palaiseau Cedex, FRANCE
| | - Marie-Claire Schanne-Klein
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS, INSERM U1182, 91128 Palaiseau Cedex, FRANCE
| | - Florence Ruggiero
- Institut de Génomique Fonctionnelle de Lyon, ENS-Lyon, CNRS UMR 5242, Université Lyon 1, 46 Allée d'Italie, 69364 Lyon, cedex 07 France
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14
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Douarche C, Allain JM, Raspaud E. Bacillus subtilis Bacteria Generate an Internal Mechanical Force within a Biofilm. Biophys J 2015; 109:2195-202. [PMID: 26588577 PMCID: PMC4656877 DOI: 10.1016/j.bpj.2015.10.004] [Citation(s) in RCA: 27] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/01/2015] [Accepted: 10/05/2015] [Indexed: 01/04/2023] Open
Abstract
A key issue in understanding why biofilms are the most prevalent mode of bacterial life is the origin of the degree of resistance and protection that bacteria gain from self-organizing into biofilm communities. Our experiments suggest that their mechanical properties are a key factor. Experiments on pellicles, or floating biofilms, of Bacillus subtilis showed that while they are multiplying and secreting extracellular substances, bacteria create an internal force (associated with a -80±25 Pa stress) within the biofilms, similar to the forces that self-equilibrate and strengthen plants, organs, and some engineered buildings. Here, we found that this force, or stress, is associated with growth-induced pressure. Our observations indicate that due to such forces, biofilms spread after any cut or ablation by up to 15-20% of their initial size. The force relaxes over very short timescales (tens of milliseconds). We conclude that this force helps bacteria to shape the biofilm, improve its mechanical resistance, and facilitate its invasion and self-repair.
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Affiliation(s)
- Carine Douarche
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS-UMR 8502, Orsay Cedex, France
| | - Jean-Marc Allain
- Laboratoire de Mécanique des Solides, CNRS-UMR 7649, École Polytechnique, Palaiseau, France
| | - Eric Raspaud
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS-UMR 8502, Orsay Cedex, France.
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15
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Tidu A, Ghoubay-Benallaoua D, Lynch B, Haye B, Illoul C, Allain JM, Borderie VM, Mosser G. Development of human corneal epithelium on organized fibrillated transparent collagen matrices synthesized at high concentration. Acta Biomater 2015; 22:50-8. [PMID: 25931016 DOI: 10.1016/j.actbio.2015.04.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [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: 12/07/2014] [Revised: 03/06/2015] [Accepted: 04/14/2015] [Indexed: 12/13/2022]
Abstract
Several diseases can lead to opacification of cornea requiring transplantation of donor tissue to restore vision. In this context, transparent collagen I fibrillated matrices have been synthesized at 15, 30, 60 and 90 mg/mL. The matrices were evaluated for fibril organizations, transparency, mechanical properties and ability to support corneal epithelial cell culture. The best results were obtained with 90 mg/mL scaffolds. At this concentration, the fibril organization presented some similarities to that found in corneal stroma. Matrices had a mean Young's modulus of 570 kPa and acellular scaffolds had a transparency of 87% in the 380-780 nm wavelength range. Human corneal epithelial cells successfully colonized the surface of the scaffolds and generated an epithelium with characteristics of corneal epithelial cells (i.e. expression of cytokeratin 3 and presence of desmosomes) and maintenance of stemness during culture (i.e. expression of ΔNp63α and formation of holoclones in colony formation assay). Presence of cultured epithelium on the matrices was associated with increased transparency (89%).
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Affiliation(s)
- Aurélien Tidu
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France
| | - Djida Ghoubay-Benallaoua
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, Institut de la Vision, Paris F75012, France; INSERM, U968, Paris F75012, France; CNRS, UMR_7210, Paris F75012, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU View Maintain, INSERM-DHOS CIC 1423, Paris F-75012, France
| | - Barbara Lynch
- Solids Mechanics Laboratory, Ecole Polytechnique, Centre National de la Recherche Scientifique, Palaiseau, France
| | - Bernard Haye
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France
| | - Corinne Illoul
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France
| | - Jean-Marc Allain
- Solids Mechanics Laboratory, Ecole Polytechnique, Centre National de la Recherche Scientifique, Palaiseau, France
| | - Vincent M Borderie
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 968, Institut de la Vision, Paris F75012, France; INSERM, U968, Paris F75012, France; CNRS, UMR_7210, Paris F75012, France; Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts, DHU View Maintain, INSERM-DHOS CIC 1423, Paris F-75012, France
| | - Gervaise Mosser
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France.
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16
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Wang W, Roubier N, Puel G, Allain JM, Infante IC, Attal JP, Vennat E. A New Method Combining Finite Element Analysis and Digital Image Correlation to Assess Macroscopic Mechanical Properties of Dentin. Materials (Basel) 2015; 8:535-550. [PMID: 28787955 PMCID: PMC5455261 DOI: 10.3390/ma8020535] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 01/19/2015] [Accepted: 01/27/2015] [Indexed: 11/30/2022]
Abstract
A literature review points out a large discrepancy in the results of the mechanical tests on dentin that can be explained by stress and strain assessment during the tests. Errors in these assessments during mechanical tests can lead to inaccurate estimation of the mechanical properties of the tested material. On top of that, using the beam theory to analyze the bending test for thick specimens will increase these experimental errors. After summarizing the results of mechanical tests on dentin in the literature, we focus on bending tests and compare the stress assessment obtained by finite element analysis (FEA) and by beam theory application. We show that the difference between the two methods can be quite large in some cases, leading us to prefer the use of FEA to assess stresses. We then propose a new method based on coupling finite element analysis and digital image correlation (DIC) to more accurately evaluate stress distributions, strain distributions and elastic modulus in the case of a three-point bending test. To illustrate and prove the feasibility of the method, it is applied on a dentinal sample so that mean elastic modulus and maximum tensile stress are obtained (11.9 GPa and 143.9 MPa). Note that the main purpose of this study is to focus on the method itself, and not to provide new mechanical values for dentin. When used in standard mechanical testing of dentin, this kind of method should help to narrow the range of obtained mechanical properties values.
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Affiliation(s)
- Wenlong Wang
- MSSMat, UMR 8579 CNRS-Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry Cedex, France.
| | - Nicolas Roubier
- MSSMat, UMR 8579 CNRS-Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry Cedex, France.
| | - Guillaume Puel
- MSSMat, UMR 8579 CNRS-Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry Cedex, France.
| | - Jean-Marc Allain
- LMS, UMR 7649 CNRS-Ecole Polytechnique, 91128 Palaiseau Cedex, France.
| | - Ingrid C Infante
- SPMS, UMR 8580 CNRS-Ecole Centrale Paris, Grande Voie des Vignes,92295 Chatenay-Malabry Cedex, France.
| | - Jean-Pierre Attal
- URB2i, EA4462 Université Paris Descartes, 1 rue M. Arnoux, 92120 Montrouge, France.
| | - Elsa Vennat
- MSSMat, UMR 8579 CNRS-Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry Cedex, France.
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17
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Vardakastani V, Saletti D, Skalli W, Marry P, Allain JM, Adam C. Increased intra-cortical porosity reduces bone stiffness and strength in pediatric patients with osteogenesis imperfecta. Bone 2014; 69:61-7. [PMID: 25238898 DOI: 10.1016/j.bone.2014.09.003] [Citation(s) in RCA: 20] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 08/28/2014] [Accepted: 09/02/2014] [Indexed: 01/27/2023]
Abstract
Osteogenesis imperfecta (OI) is a heritable disease occurring in one out of every 20,000 births. Although it is known that Type I collagen mutation in OI leads to increased bone fragility, the mechanism of this increased susceptibility to fracture is not clear. The aim of this study was to assess the microstructure of cortical bone fragments from patients with osteogenesis imperfecta (OI) using polarized light microscopy, and to correlate microstructural observations with the results of previously performed mechanical compression tests on bone from the same source. Specimens of cortical bone were harvested from the lower limbs of three (3) OI patients at the time of surgery, and were divided into two groups. Group 1 had been subjected to previous micro-mechanical compression testing, while Group 2 had not been subjected to any prior testing. Polarized light microscopy revealed disorganized bone collagen architecture as has been previously observed, as well as a large increase in the areal porosity of the bone compared to typical values for healthy cortical bone, with large (several hundred micron sized), asymmetrical pores. Importantly, the areal porosity of the OI bone samples in Group 1 appears to correlate strongly with their previously measured apparent Young's modulus and compressive strength. Taken together with prior nanoindentation studies on OI bone tissue, the results of this study suggest that increased intra-cortical porosity is responsible for the reduction in macroscopic mechanical properties of OI cortical bone, and therefore that in vivo imaging modalities with resolutions of ~100 μm or less could potentially be used to non-invasively assess bone strength in OI patients. Although the number of subjects in this study is small, these results highlight the importance of further studies in OI bone by groups with access to human OI tissue in order to clarify the relationship between increased porosity and reduced macroscopic mechanical integrity.
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Affiliation(s)
- V Vardakastani
- Institut de Biomécanique Humaine Georges Charpak, Arts et Metiers ParisTech (ENSAM), 151 Boulevard de l'Hôpital, 75013 Paris, France
| | - D Saletti
- Institut de Biomécanique Humaine Georges Charpak, Arts et Metiers ParisTech (ENSAM), 151 Boulevard de l'Hôpital, 75013 Paris, France
| | - W Skalli
- Institut de Biomécanique Humaine Georges Charpak, Arts et Metiers ParisTech (ENSAM), 151 Boulevard de l'Hôpital, 75013 Paris, France
| | - P Marry
- Service de Chirurgie Orthopédique et Réparatrice de l'enfant, Hôpital Armand Trousseau, 26, avenue du Docteur Arnold Netter, 75571 Paris Cedex 12, France
| | - J M Allain
- Laboratoire de Mécanique des Solides, CNRS UMR7649, Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - C Adam
- Institut de Biomécanique Humaine Georges Charpak, Arts et Metiers ParisTech (ENSAM), 151 Boulevard de l'Hôpital, 75013 Paris, France; School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, 2 George St, Brisbane, Australia.
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18
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Türkcan S, Richly MU, Bouzigues CI, Allain JM, Alexandrou A. Receptor displacement in the cell membrane by hydrodynamic force amplification through nanoparticles. Biophys J 2014; 105:116-26. [PMID: 23823230 DOI: 10.1016/j.bpj.2013.05.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 05/07/2013] [Accepted: 05/20/2013] [Indexed: 12/11/2022] Open
Abstract
We introduce an intrinsically multiplexed and easy to implement method to apply an external force to a biomolecule and thus probe its interaction with a second biomolecule or, more generally, its environment (for example, the cell membrane). We take advantage of the hydrodynamic interaction with a controlled fluid flow within a microfluidic channel to apply a force. By labeling the biomolecule with a nanoparticle that acts as a kite and increases the hydrodynamic interaction with the fluid, the drag induced by convection becomes important. We use this approach to track the motion of single membrane receptors, the Clostridium perfringens ε-toxin (CPεT) receptors that are confined in lipid raft platforms, and probe their interaction with the environment. Under external force, we observe displacements over distances up to 10 times the confining domain diameter due to elastic deformation of a barrier and return to the initial position after the flow is stopped. Receptors can also jump over such barriers. Analysis of the receptor motion characteristics before, during, and after a force is applied via the flow indicates that the receptors are displaced together with their confining raft platform. Experiments before and after incubation with latrunculin B reveal that the barriers are part of the actin cytoskeleton and have an average spring constant of 2.5 ± 0.6 pN/μm before vs. 0.6 ± 0.2 pN/μm after partial actin depolymerization. Our data, in combination with our previous work demonstrating that the ε-toxin receptor confinement is not influenced by the cytoskeleton, imply that it is the raft platform and its constituents rather than the receptor itself that encounters and deforms the barriers formed by the actin cytoskeleton.
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Affiliation(s)
- Silvan Türkcan
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale U696, Palaiseau Cedex, France
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Richly MU, Türkcan S, Bouzigues C, Popoff MR, Masson JB, Allain JM, Alexandrou A. Investigating the Cell Membrane via Single Particle Tracking, Bayesian Inference and Hydrodynamic Force Application. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.3504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Gusachenko I, Tran V, Goulam Houssen Y, Allain JM, Schanne-Klein MC. Polarization-resolved second-harmonic generation in tendon upon mechanical stretching. Biophys J 2012; 102:2220-9. [PMID: 22824287 DOI: 10.1016/j.bpj.2012.03.068] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 03/05/2012] [Accepted: 03/23/2012] [Indexed: 10/28/2022] Open
Abstract
Collagen is a triple-helical protein that forms various macromolecular organizations in tissues and is responsible for the biomechanical and physical properties of most organs. Second-harmonic generation (SHG) microscopy is a valuable imaging technique to probe collagen fibrillar organization. In this article, we use a multiscale nonlinear optical formalism to bring theoretical evidence that anisotropy of polarization-resolved SHG mostly reflects the micrometer-scale disorder in the collagen fibril distribution. Our theoretical expectations are confirmed by experimental results in rat-tail tendon. To that end, we report what to our knowledge is the first experimental implementation of polarization-resolved SHG microscopy combined with mechanical assays, to simultaneously monitor the biomechanical response of rat-tail tendon at macroscopic scale and the rearrangement of collagen fibrils in this tissue at microscopic scale. These experiments bring direct evidence that tendon stretching corresponds to straightening and aligning of collagen fibrils within the fascicle. We observe a decrease in the SHG anisotropy parameter when the tendon is stretched in a physiological range, in agreement with our numerical simulations. Moreover, these experiments provide a unique measurement of the nonlinear optical response of aligned fibrils. Our data show an excellent agreement with recently published theoretical calculations of the collagen triple helix hyperpolarizability.
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Affiliation(s)
- Ivan Gusachenko
- Laboratory for Optics and Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale U696, Palaiseau, France
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Goulam-Houssen Y, Gusachenko I, Schanne-Klein MC, Allain JM. IMAGING RAT-TAIL COLLAGEN ORGANIZATION USING SHG MICROSCOPY UPON MECHANICAL STRAIN. J Biomech 2012. [DOI: 10.1016/s0021-9290(12)70581-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Chauvet D, Tran V, Mutlu G, George B, Allain JM. Study of dural suture watertightness: an in vitro comparison of different sealants. Acta Neurochir (Wien) 2011; 153:2465-72. [PMID: 21989779 DOI: 10.1007/s00701-011-1197-9] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [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: 08/19/2011] [Accepted: 09/27/2011] [Indexed: 11/26/2022]
Abstract
BACKGROUND CSF leakages constitute a major complication of intradural procedures, especially for posterior fossa and skull base surgery. Dural suture watertightness is a decisive issue, and neurosurgeons routinely use different products to reinforce their dural closure. We have designed an experimental system capable of testing CSF leak pressure levels in order to compare two types of sutures in vitro and particularly four different sealants. METHODS Twenty-five fresh human cadaveric dural samples were removed and prepared for testing in a pressure chamber system connected to a hydraulic pressure motor. CSF leak levels were objectively registered. First, simple interrupted stitches were compared to running simple closure on 50-mm linear suture. Secondly, four sealants (two sealants/glues, Bioglue®, Duraseal®; two haemostatics, Tachosil®, Tissucol®) were tested. Statistical analysis was performed with paired Student's t-test. RESULTS No significant difference between interrupted closure and running suture was observed (p = 0.079). All sealants increased the watertightness of the suture significatively. However, comparison of the means of the differences for each product revealed large variations. In the conditions of our experiment, one sealant (Duraseal®) and one haemostatic (Tachosil®) seemed to show better results. We observed two different types of leakage: at the dura-sealant interface and through the sealant itself. CONCLUSIONS We have developed an experimental device capable of testing dural closure watertightness. Interrupted stitch suturing seemed no different from running simple closure. On the contrary, the sealants tested show different watertightness capacities.
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Affiliation(s)
- Dorian Chauvet
- Department of Neurosurgery, Groupe Hospitalier Pitié-Salpêtrière and Lariboisiere Hospital, 29 avenue Jean Moulin, 75014 Paris, France.
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Chauvet D, Carpentier A, Allain JM, Polivka M, Crépin J, George B. Histological and biomechanical study of dura mater applied to the technique of dura splitting decompression in Chiari type I malformation. Neurosurg Rev 2010; 33:287-94; discussion 295. [DOI: 10.1007/s10143-010-0261-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2009] [Revised: 03/08/2010] [Accepted: 03/08/2010] [Indexed: 02/02/2023]
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