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Baratange C, Paris-Palacios S, Bonnard I, Delahaut L, Grandjean D, Wortham L, Sayen S, Gallorini A, Michel J, Renault D, Breider F, Loizeau JL, Cosio C. Metabolic, cellular and defense responses to single and co-exposure to carbamazepine and methylmercury in Dreissena polymorpha. Environ Pollut 2022; 300:118933. [PMID: 35122922 DOI: 10.1016/j.envpol.2022.118933] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 01/18/2022] [Accepted: 01/30/2022] [Indexed: 06/14/2023]
Abstract
Carbamazepine (CBZ) and Hg are widespread and persistent micropollutants in aquatic environments. Both pollutants are known to trigger similar toxicity mechanisms, e.g. reactive oxygen species (ROS) production. Here, their effects were assessed in the zebra mussel Dreissena polymorpha, frequently used as a freshwater model in ecotoxicology and biomonitoring. Single and co-exposures to CBZ (3.9 μg L-1) and MeHg (280 ng L-1) were performed for 1 and 7 days. Metabolomics analyses evidenced that the co-exposure was the most disturbing after 7 days, reducing the amount of 25 metabolites involved in protein synthesis, energy metabolism, antioxidant response and osmoregulation, and significantly altering cells and organelles' structure supporting a reduction of functions of gills and digestive glands. CBZ alone after 7 days decreased the amount of α-aminobutyric acid and had a moderate effect on the structure of mitochondria in digestive glands. MeHg alone had no effect on mussels' metabolome, but caused a significant alteration of cells and organelles' structure in gills and digestive glands. Single exposures and the co-exposure increased antioxidant responses vs control in gills and digestive glands, without resulting in lipid peroxidation, suggesting an increased ROS production caused by both pollutants. Data globally supported that a higher number of hyperactive cells compensated cellular alterations in the digestive gland of mussels exposed to CBZ or MeHg alone, while CBZ + MeHg co-exposure overwhelmed this compensation after 7 days. Those effects were unpredictable based on cellular responses to CBZ and MeHg alone, highlighting the need to consider molecular toxicity pathways for a better anticipation of effects of pollutants in biota in complex environmental conditions.
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Affiliation(s)
- Clément Baratange
- Université de Reims Champagne-Ardenne, UMR-I 02 INERIS-URCA-ULH SEBIO, Unité Stress Environnementaux et BIOsurveillance des Milieux Aquatiques (SEBIO), BP 1039 F, 51687, Reims, Cedex, France
| | - Séverine Paris-Palacios
- Université de Reims Champagne-Ardenne, UMR-I 02 INERIS-URCA-ULH SEBIO, Unité Stress Environnementaux et BIOsurveillance des Milieux Aquatiques (SEBIO), BP 1039 F, 51687, Reims, Cedex, France
| | - Isabelle Bonnard
- Université de Reims Champagne-Ardenne, UMR-I 02 INERIS-URCA-ULH SEBIO, Unité Stress Environnementaux et BIOsurveillance des Milieux Aquatiques (SEBIO), BP 1039 F, 51687, Reims, Cedex, France
| | - Laurence Delahaut
- Université de Reims Champagne-Ardenne, UMR-I 02 INERIS-URCA-ULH SEBIO, Unité Stress Environnementaux et BIOsurveillance des Milieux Aquatiques (SEBIO), BP 1039 F, 51687, Reims, Cedex, France
| | - Dominique Grandjean
- ENAC, IIE, Central Environmental Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 2, 1015, Lausanne, Switzerland
| | - Laurence Wortham
- Inserm UMR-S-1250 P3Cell, Université de Reims Champagne-Ardenne, 51685, Reims, Cedex 2, France
| | - Stéphanie Sayen
- Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), UMR CNRS 7312, BP 1039, F-51687 Reims Cedex 2, France
| | - Andrea Gallorini
- Department F.-A. Forel for Environmental and Aquatic Sciences, And Institute for Environmental Sciences, University of Geneva, Boulevard Carl-Vogt 66, 1211, Geneva 4, Switzerland
| | - Jean Michel
- Inserm UMR-S-1250 P3Cell, Université de Reims Champagne-Ardenne, 51685, Reims, Cedex 2, France
| | - David Renault
- University of Rennes, CNRS, ECOBIO (Ecosystèmes, Biodiversité, évolution), UMR, 6553, Rennes, France; Institut Universitaire de France, 1 Rue Descartes, 75231, Paris Cedex 05, France
| | - Florian Breider
- ENAC, IIE, Central Environmental Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 2, 1015, Lausanne, Switzerland
| | - Jean-Luc Loizeau
- Department F.-A. Forel for Environmental and Aquatic Sciences, And Institute for Environmental Sciences, University of Geneva, Boulevard Carl-Vogt 66, 1211, Geneva 4, Switzerland
| | - Claudia Cosio
- Université de Reims Champagne-Ardenne, UMR-I 02 INERIS-URCA-ULH SEBIO, Unité Stress Environnementaux et BIOsurveillance des Milieux Aquatiques (SEBIO), BP 1039 F, 51687, Reims, Cedex, France.
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Michel J, Nolin F, Wortham L, Lalun N, Tchelidze P, Banchet V, Terryn C, Ploton D. Various Nucleolar Stress Inducers Result in Highly Distinct Changes in Water, Dry Mass and Elemental Content in Cancerous Cell Compartments: Investigation Using a Nano-Analytical Approach. Nanotheranostics 2019; 3:179-195. [PMID: 31183313 PMCID: PMC6536780 DOI: 10.7150/ntno.31878] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 04/20/2019] [Indexed: 01/10/2023] Open
Abstract
Rationale: Numerous chemotherapeutic drugs that affect ribosome biogenesis in the nucleolus induce nucleolar stress. Improving our understanding of the effects of these drugs will require uncovering and comparing their impact on several biophysical parameters of the major cell compartments. Here, we quantified the water content and dry mass of cancerous cells treated with CX-5461, DRB or DAM to calculate macromolecular crowding and the volume occupied by free water, as well as elemental content. Methods: HeLa-H2B-GFP cells were treated with CX-5461, DRB or DAM. Water content and dry mass were measured in numerous regions of interest of ultrathin cryo-sections by quantitative scanning transmission electron microscope dark-field imaging and the elements quantified by energy dispersive X-ray spectrometry. The data were used to calculate macromolecular crowding and the volume occupied by free water in all cell compartments of control and treated cells. Hydrophobic and unfolded proteins were revealed by 8-Anilinonaphtalene-1-sulfonic acid (ANS) staining and imaging by two-photon microscopy. Immunolabeling of UBF, pNBS1 and pNF-κB was carried out and the images acquired with a confocal microscope for 3D imaging to address whether the localization of these proteins changes in treated cells. Results: Treatment with CX-5461, DRB or DAM induced completely different changes in macromolecular crowding and elemental content. Macromolecular crowding and elemental content were much higher in CX-5461-treated, moderately higher in DRB-treated, and much lower in DAM-treated cells than control cells. None of the drugs alone induced nucleolar ANS staining but it was induced by heat-shock of control cells and cells previously treated with DAM. UBF and pNBS1 were systematically co-localized in the nucleolus of CX-5461- and DAM-treated cells. pNF-κB only localized to the nucleolar caps of pre-apoptotic DAM-treated cells. Conclusion: We directly quantified water and ion content in cell compartments using cryo-correlative electron microscopy. We show that different chemotherapeutic nucleolar stress inducers result in distinctive, thus far-unrecognized changes in macromolecular crowding and elemental content which are known to modify cell metabolism. Moreover we were able to correlate these changes to the sensitivity of treated cells to heat-shock and the behavior of nucleolar pNBS1 and pNF-κB.
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Affiliation(s)
- Jean Michel
- UMR-S 1250 INSERM, Université de Reims Champagne Ardenne
| | | | - Laurence Wortham
- Platform of Cell and Tissue Imaging (PICT), Université de Reims Champagne Ardenne
| | - Nathalie Lalun
- UMR-S 1250 INSERM, Université de Reims Champagne Ardenne
| | - Pavel Tchelidze
- Faculty of Exact and Life Sciences, Department of Morphology, Tbilisi State University, Tbilisi, Georgia
| | | | - Christine Terryn
- Platform of Cell and Tissue Imaging (PICT), Université de Reims Champagne Ardenne
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Casanova G, Nolin F, Wortham L, Ploton D, Banchet V, Michel J. Shrinkage of freeze-dried cryosections of cells: Investigations by EFTEM and cryo-CLEM. Micron 2016; 88:77-83. [PMID: 27428286 DOI: 10.1016/j.micron.2016.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 05/13/2016] [Revised: 06/27/2016] [Accepted: 06/27/2016] [Indexed: 11/18/2022]
Abstract
Freeze-drying of cryosections of cells or tissues is considered to be the most efficient preparation for microanalysis purpose related to transmission electron microscopy. It allows the measurements of ions and water contents at the ultrastructural level. However an important drawback is associated to freeze-drying: the shrinkage of the cryosections. The aim of this paper is the investigation of this phenomenon by means of three different methods applied to both hydrated and dehydrated cryosections: direct distance measurements on fiducial points, thickness measurements by energy filtered transmission microscopy (EFTEM) and cryo-correlative light electron microscopy (cryo-CLEM). Measurements in our experimental conditions reveal a lateral shrinkage around 10% but the most important result concerns the lack of differential shrinkage between most of the cellular compartments.
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Affiliation(s)
- G Casanova
- Laboratoire de Recherche en Nanosciences, EA4682, Université de Reims Champagne Ardenne, 21 rue Clément Ader, 51685 Reims Cedex 2, France
| | - F Nolin
- Laboratoire de Recherche en Nanosciences, EA4682, Université de Reims Champagne Ardenne, 21 rue Clément Ader, 51685 Reims Cedex 2, France
| | - L Wortham
- Laboratoire de Recherche en Nanosciences, EA4682, Université de Reims Champagne Ardenne, 21 rue Clément Ader, 51685 Reims Cedex 2, France
| | - D Ploton
- CNRS UMR 7369, Université de Reims Champagne Ardenne, Reims, France
| | - V Banchet
- Laboratoire de Recherche en Nanosciences, EA4682, Université de Reims Champagne Ardenne, 21 rue Clément Ader, 51685 Reims Cedex 2, France
| | - J Michel
- Laboratoire de Recherche en Nanosciences, EA4682, Université de Reims Champagne Ardenne, 21 rue Clément Ader, 51685 Reims Cedex 2, France.
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Miotto-Vilanova L, Jacquard C, Courteaux B, Wortham L, Michel J, Clément C, Barka EA, Sanchez L. Burkholderia phytofirmans PsJN Confers Grapevine Resistance against Botrytis cinerea via a Direct Antimicrobial Effect Combined with a Better Resource Mobilization. Front Plant Sci 2016; 7:1236. [PMID: 27602036 PMCID: PMC4993772 DOI: 10.3389/fpls.2016.01236] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 08/04/2016] [Indexed: 05/18/2023]
Abstract
Plant innate immunity serves as a surveillance system by providing the first line of powerful weapons to fight against pathogen attacks. Beneficial microorganisms and Microbial-Associated Molecular Patterns might act as signals to trigger this immunity. Burkholderia phytofirmans PsJN, a highly efficient plant beneficial endophytic bacterium, promotes growth in a wide variety of plants including grapevine. Further, the bacterium induces plant resistance against abiotic and biotic stresses. However, no study has deciphered triggered-mechanisms during the tripartite interaction between grapevine, B. phytofirmans PsJN and Botrytis cinerea. Herein, we showed that in contrast with classical rhizobacteria, which are restricted in the root system and act through ISR, B. phytofirmans PsJN is able to migrate until aerial part and forms at leaves surface a biofilm around B. cinerea mycelium to restrict the pathogen. Nevertheless, considering the endophytic level of PsJN in leaves, the plant protection efficacy of B. phytofirmans PsJN could not be explained solely by its direct antifungal effect. Deeper investigations showed a callose deposition, H2O2 production and primed expression of PR1, PR2, PR5, and JAZ only in bacterized-plantlets after pathogen challenge. The presence of PsJN modulated changes in leaf carbohydrate metabolism including gene expression, sugar levels, and chlorophyll fluorescence imaging after Botrytis challenge. Our findings indicated that protection induced by B. phytofirmans PsJN was multifaceted and relied on a direct antifungal effect, priming of defense mechanisms as well as the mobilization of carbon sources in grapevine leaf tissues.
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Affiliation(s)
- Lidiane Miotto-Vilanova
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Cédric Jacquard
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Barbara Courteaux
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Laurence Wortham
- Laboratoire de Recherche en Nanosciences, EA 4682, Department of Physics, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Jean Michel
- Laboratoire de Recherche en Nanosciences, EA 4682, Department of Physics, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Christophe Clément
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Essaïd A. Barka
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
| | - Lisa Sanchez
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-ArdenneReims, France
- *Correspondence: Lisa Sanchez,
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Miotto-Vilanova L, Jacquard C, Courteaux B, Wortham L, Michel J, Clément C, Barka EA, Sanchez L. Burkholderia phytofirmans PsJN Confers Grapevine Resistance against Botrytis cinerea via a Direct Antimicrobial Effect Combined with a Better Resource Mobilization. Front Plant Sci 2016. [PMID: 27602036 DOI: 10.3389/fpls.2016.0123] [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] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Plant innate immunity serves as a surveillance system by providing the first line of powerful weapons to fight against pathogen attacks. Beneficial microorganisms and Microbial-Associated Molecular Patterns might act as signals to trigger this immunity. Burkholderia phytofirmans PsJN, a highly efficient plant beneficial endophytic bacterium, promotes growth in a wide variety of plants including grapevine. Further, the bacterium induces plant resistance against abiotic and biotic stresses. However, no study has deciphered triggered-mechanisms during the tripartite interaction between grapevine, B. phytofirmans PsJN and Botrytis cinerea. Herein, we showed that in contrast with classical rhizobacteria, which are restricted in the root system and act through ISR, B. phytofirmans PsJN is able to migrate until aerial part and forms at leaves surface a biofilm around B. cinerea mycelium to restrict the pathogen. Nevertheless, considering the endophytic level of PsJN in leaves, the plant protection efficacy of B. phytofirmans PsJN could not be explained solely by its direct antifungal effect. Deeper investigations showed a callose deposition, H2O2 production and primed expression of PR1, PR2, PR5, and JAZ only in bacterized-plantlets after pathogen challenge. The presence of PsJN modulated changes in leaf carbohydrate metabolism including gene expression, sugar levels, and chlorophyll fluorescence imaging after Botrytis challenge. Our findings indicated that protection induced by B. phytofirmans PsJN was multifaceted and relied on a direct antifungal effect, priming of defense mechanisms as well as the mobilization of carbon sources in grapevine leaf tissues.
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Affiliation(s)
- Lidiane Miotto-Vilanova
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Cédric Jacquard
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Barbara Courteaux
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Laurence Wortham
- Laboratoire de Recherche en Nanosciences, EA 4682, Department of Physics, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Jean Michel
- Laboratoire de Recherche en Nanosciences, EA 4682, Department of Physics, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Christophe Clément
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Essaïd A Barka
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
| | - Lisa Sanchez
- Laboratoire de Stress, Défenses et Reproduction des Plantes URVVC-EA 4707, UFR Sciences Exactes et Naturelles, University of Reims-Champagne-Ardenne Reims, France
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Nolin F, Ploton D, Wortham L, Tchelidze P, Bobichon H, Banchet V, Lalun N, Terryn C, Michel J. Targeted nano analysis of water and ions in the nucleus using cryo-correlative microscopy. Methods Mol Biol 2015; 1228:145-58. [PMID: 25311128 DOI: 10.1007/978-1-4939-1680-1_12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
The cell nucleus is a crowded volume in which the concentration of macromolecules is high. These macromolecules sequester most of the water molecules and ions which, together, are very important for stabilization and folding of proteins and nucleic acids. To better understand how the localization and quantity of water and ions vary with nuclear activity, it is necessary to study them simultaneously by using newly developed cell imaging approaches. Some years ago, we showed that dark-field cryo-Scanning Transmission Electron Microscopy (cryo-STEM) allows quantification of the mass percentages of water, dry matter, and elements (among which are ions) in freeze-dried ultrathin sections. To overcome the difficulty of clearly identifying nuclear subcompartments imaged by STEM in ultrathin cryo-sections, we developed a new cryo correlative light and STEM imaging procedure. This combines fluorescence imaging of nuclear GFP-tagged proteins to identify, within cryo ultrathin sections, regions of interest which are then analyzed by STEM for quantification of water and identification and quantification of ions. In this chapter we describe the new setup we have developed to perform this cryo-correlative light and STEM imaging approach, which allows a targeted nano analysis of water and ions in nuclear compartments.
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Affiliation(s)
- Frédérique Nolin
- Laboratoire de Recherche en Nanosciences EA 4682, UFR Sciences Exactes et Naturelles, Université de Reims Champagne Ardenne, Reims, France
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Nolin F, Michel J, Wortham L, Tchelidze P, Balossier G, Banchet V, Bobichon H, Lalun N, Terryn C, Ploton D. Changes to cellular water and element content induced by nucleolar stress: investigation by a cryo-correlative nano-imaging approach. Cell Mol Life Sci 2013; 70:2383-94. [DOI: 10.1007/s00018-013-1267-7] [Citation(s) in RCA: 26] [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: 10/17/2012] [Revised: 01/10/2013] [Accepted: 01/14/2013] [Indexed: 01/01/2023]
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Nolin F, Ploton D, Wortham L, Tchelidze P, Balossier G, Banchet V, Bobichon H, Lalun N, Terryn C, Michel J. Targeted nano analysis of water and ions using cryocorrelative light and scanning transmission electron microscopy. J Struct Biol 2012; 180:352-61. [PMID: 22960055 DOI: 10.1016/j.jsb.2012.08.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 08/23/2012] [Accepted: 08/28/2012] [Indexed: 10/27/2022]
Abstract
Cryo fluorescence imaging coupled with the cryo-EM technique (cryo-CLEM) avoids chemical fixation and embedding in plastic, and is the gold standard for correlated imaging in a close to native state. This multi-modal approach has not previously included elementary nano analysis or evaluation of water content. We developed a new approach allowing analysis of targeted in situ intracellular ions and water measurements at the nanoscale (EDXS and STEM dark field imaging) within domains identified by examination of specific GFP-tagged proteins. This method allows both water and ions- fundamental to cell biology- to be located and quantified at the subcellular level. We illustrate the potential of this approach by investigating changes in water and ion content in nuclear domains identified by GFP-tagged proteins in cells stressed by Actinomycin D treatment and controls. The resolution of our approach was sufficient to distinguish clumps of condensed chromatin from surrounding nucleoplasm by fluorescence imaging and to perform nano analysis in this targeted compartment.
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Affiliation(s)
- Frédérique Nolin
- Laboratoire de Recherche en Nanosciences EA 4682, UFR Sciences Exactes et Naturelles, Université de Reims Champagne Ardenne, 21 rue Clément ADER, Reims, France
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Banchet V, Michel J, Jallot E, Wortham L, Bouthors S, Laurent-Maquin D, Balossier G. Interfacial reactions of glasses for biomedical application by scanning transmission electron microscopy and microanalysis. Acta Biomater 2006; 2:349-59. [PMID: 16701894 DOI: 10.1016/j.actbio.2006.01.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 09/02/2005] [Revised: 01/24/2006] [Accepted: 01/25/2006] [Indexed: 10/24/2022]
Abstract
Short-term physico-chemical reactions at the interface between bioactive glass particles and biological fluids are studied for three glasses with different bioactive properties; these glasses are in the SiO(2)-Na(2)O-CaO-P(2)O(5)-K(2)O-Al(2)O(3)-MgO system. Our aim is to show the difference between the mechanisms of their surface reactions. The relation between the composition and the bioactive properties of these glasses is also discussed. The elemental analysis is performed at the submicrometer scale by scanning transmission electron microscopy associated with energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy. After different immersion times (ranging from 0 to 96 h) of bioactive glass particles in a simulated biological solution, results show the formation of different surface layers at the glass periphery in the case of two bioactive glasses (A9 and BVA). For the third glass (BVH) we do not observe any surface layer formation or any modification of the glass composition. For the two other glasses (A9 and BVA), we observe the presence of different layers: an already observed (Si, O, Al) rich layer at the periphery, a previously demonstrated thin (Si, O) layer formed on top of the (Si, O, Al) layer and a (Ca, P) layer. We determine the different steps of the mechanisms of the surface reactions, which appear to be similar in these glasses, and compare the physico-chemical reactions and kinetics using the different immersion times. The A9 glass permits the observation of all important steps of the surface reactions which lead to bioactivity. This study shows the important relationship between composition and bioactivity which can determine the medical applicability of the glass.
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Affiliation(s)
- V Banchet
- Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, Ecole Centrale de Lyon, 36 Av Guy de Collongue, 69134 Ecully Cedex, France.
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Banchet V, Jallot E, Michel J, Wortham L, Laurent-Maquin D, Balossier G. X-ray microanalysis in STEM of short-term physicochemical reactions at bioactive glass particle/biological fluid interface. Determination of O/Si atomic ratios. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1916] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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