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Aghigh A, Jargot G, Zaouter C, Preston SEJ, Mohammadi MS, Ibrahim H, Del Rincón SV, Patten K, Légaré F. A comparative study of CARE 2D and N2V 2D for tissue-specific denoising in second harmonic generation imaging. J Biophotonics 2024:e202300565. [PMID: 38566461 DOI: 10.1002/jbio.202300565] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 03/11/2024] [Accepted: 03/17/2024] [Indexed: 04/04/2024]
Abstract
This study explored the application of deep learning in second harmonic generation (SHG) microscopy, a rapidly growing area. This study focuses on the impact of glycerol concentration on image noise in SHG microscopy and compares two image restoration techniques: Noise-to-Void 2D (N2V 2D, no reference image restoration) and content-aware image restoration (CARE 2D, full reference image restoration). We demonstrated that N2V 2D effectively restored the images affected by high glycerol concentrations. To reduce sample exposure and damage, this study further addresses low-power SHG imaging by reducing the laser power by 70% using deep learning techniques. CARE 2D excels in preserving detailed structures, whereas N2V 2D maintains natural muscle structure. This study highlights the strengths and limitations of these models in specific SHG microscopy applications, offering valuable insights and potential advancements in the field .
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Affiliation(s)
- Arash Aghigh
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
| | - Gaëtan Jargot
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
| | - Charlotte Zaouter
- Armand-Frappier Santé Biotechnologie Research Centre, Laval, Québec, Canada
| | - Samuel E J Preston
- Department of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Québec, Canada
- Gerald Bronfman Department of Oncology, Segal Cancer Centre, Lady Davis Institute and Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Melika Saadat Mohammadi
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
| | - Heide Ibrahim
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
| | - Sonia V Del Rincón
- Department of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Québec, Canada
- Gerald Bronfman Department of Oncology, Segal Cancer Centre, Lady Davis Institute and Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Kessen Patten
- Armand-Frappier Santé Biotechnologie Research Centre, Laval, Québec, Canada
| | - François Légaré
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
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2
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Mercatelli R, Triulzi T, Pavone FS, Orlandi R, Cicchi R. Collagen ultrastructural symmetry and its malignant alterations in human breast cancer revealed by polarization-resolved second-harmonic generation microscopy. J Biophotonics 2020; 13:e202000159. [PMID: 32472568 DOI: 10.1002/jbio.202000159] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/24/2020] [Accepted: 05/26/2020] [Indexed: 06/11/2023]
Abstract
Several specific alterations of the extracellular matrix can be considered a distinctive hallmark of cancer. In particular, a different morphology of the collagen scaffold is frequently found within the peritumoural environment. In this study, we report about a significant difference in the ultrastructural organization of collagen at the supra-molecular level between the perilesional scaffold and the tumour area in human breast carcinoma samples. In particular, we demonstrated that polarization-resolved second-harmonic generation (P-SHG) microscopy is able to link the altered collagen architecture at the ultrastructural level found in perilesional tissue with a different organization of collagen fibrils at the molecular level.
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Affiliation(s)
- Raffaella Mercatelli
- National Institute of Optics, National Research Council (CNR-INO), Sesto Fiorentino, Italy
- Aerospazio Tecnologie s.r.l., Italy
| | - Tiziana Triulzi
- Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Francesco Saverio Pavone
- Department of Physics, University of Florence, Sesto Fiorentino, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Sesto Fiorentino, Italy
| | - Rosaria Orlandi
- Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Riccardo Cicchi
- National Institute of Optics, National Research Council (CNR-INO), Sesto Fiorentino, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Sesto Fiorentino, Italy
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3
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Chakraborty I, Pallen S, Shetty Y, Roy N, Mazumder N. Advanced microscopy techniques for revealing molecular structure of starch granules. Biophys Rev 2020; 12:105-22. [PMID: 31950343 DOI: 10.1007/s12551-020-00614-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 01/07/2020] [Indexed: 01/04/2023] Open
Abstract
Starch is a major source of our daily diet and it is important to understand the molecular structure that plays a significant role in its wide number of applications. In this review article, microscopic structures of starch granules from potato, corn, rice canna, tania, wheat, sweet potato, and cassava are revealed using advanced microscopic techniques. Optical microscopy depicts the size and shape, polarization microscopy shows the anisotropy properties of starch granules, scanning electron microscopy (SEM) displays surface topography, and confocal microscopy is used to observe the three-dimensional internal structure of starch granules. The crystallinity of starch granules is revealed by second harmonic generation (SHG) microscopy and atomic force microscopy (AFM) provides mechanical properties including strength, texture, and elasticity. These properties play an important role in understanding the stability of starch granules under various processing conditions like heating, enzyme degradation, and hydration and determining its applications in various industries such as food packaging and textile industries.
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4
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Kaneshiro J, Okada Y, Shima T, Tsujii M, Imada K, Ichimura T, Watanabe TM. Second harmonic generation polarization microscopy as a tool for protein structure analysis. Biophys Physicobiol 2019; 16:147-157. [PMID: 31660282 PMCID: PMC6812877 DOI: 10.2142/biophysico.16.0_147] [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: 04/01/2019] [Accepted: 08/17/2019] [Indexed: 01/05/2023] Open
Abstract
Cryo-electron microscopy and X-ray crystallography have been the major tools of protein structure analysis for decades and will certainly continue to be essential in the future. Moreover, nuclear magnetic resonance or Förster resonance energy transfer can measure structural dynamics. Here, we propose to add optical second-harmonic generation (SHG), which is a nonlinear optical scattering process sensitive to molecular structures in illuminated materials, to the tool-kit of structural analysis methodologies. SHG can be expected to probe the structural changes of proteins in the physiological condition, and thus link protein structure and biological function. We demonstrate that a conformational change as well as its dynamics in protein macromolecular assemblies can be detected by means of SHG polarization measurement. To prove the capability of SHG polarization measurement with regard to protein structure analysis, we developed an SHG polarization microscope to analyze microtubules in solution. The difference in conformation between microtubules with different binding molecules was successfully observed as polarization dependence of SHG intensity. We also succeeded in capturing the temporal variation of structure in a photo-switchable protein crystal in both activation and inactivation processes. These results illustrate the potential of this method for protein structure analysis in physiological solutions at room temperature without any labeling.
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Affiliation(s)
- Junichi Kaneshiro
- Laboratory for Comprehensive Bioimaging, RIKEN Center for Biosystems Dynamics Research (BDR), Suita, Osaka 565-0874, Japan
| | - Yasushi Okada
- Laboratory for Cell Polarity Regulation, RIKEN Center for Biosystems Dynamics Research (BDR), Suita, Osaka 565-0874, Japan.,Department of Physics and Universal Biology Institute (UBI), Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tomohiro Shima
- Laboratory for Cell Polarity Regulation, RIKEN Center for Biosystems Dynamics Research (BDR), Suita, Osaka 565-0874, Japan
| | - Mika Tsujii
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 565-0043, Japan
| | - Katsumi Imada
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 565-0043, Japan
| | - Taro Ichimura
- Laboratory for Comprehensive Bioimaging, RIKEN Center for Biosystems Dynamics Research (BDR), Suita, Osaka 565-0874, Japan.,Transdimensional Life Imaging Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, Suita, Osaka 565-0871, Japan.,PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Tomonobu M Watanabe
- Laboratory for Comprehensive Bioimaging, RIKEN Center for Biosystems Dynamics Research (BDR), Suita, Osaka 565-0874, Japan
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5
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Gluck MJ, Vijayaraghavan S, Sinclair EB, Ashraf A, Hausman MR, Cagle PJ. Detecting structural and inflammatory response after in vivo stretch injury in the rat median nerve via second harmonic generation. J Neurosci Methods 2018; 303:68-80. [PMID: 29454014 DOI: 10.1016/j.jneumeth.2018.02.006] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Revised: 02/07/2018] [Accepted: 02/11/2018] [Indexed: 10/18/2022]
Abstract
BACKGROUND Second Harmonic Generation (SHG) microscopy is a promising method for visualizing the collagenous structure of peripheral nerves. Assessing collagen continuity and damage after a stretch injury provides inferential insight into the level of axonal damage present. NEW METHODS This study utilizes SHG microscopy after a calibrated in vivo stretch injury of rat median nerves to evaluate collagen continuity at several time points throughout the recovery process. Endoneurial collagen was qualitatively assessed in nerves that were subjected to low strain (LS) and high strain (HS) injuries using SHG microscopy, conventional histology, and immunohistochemistry. RESULTS Following an in vivo stretch injury, both LS and HS damaged nerves exhibit signs of structural collagen damage in comparison with sham control nerves (SC). Furthermore, LS nerves exhibit signs of full regeneration while HS nerves exhibited signs of only partial regeneration with lasting damage and intra-neural scar formation. COMPARISON WITH EXISTING METHODS SHG observations of structural changes and inflammatory response due to stretch injury were validated upon comparison with conventional histological methods CONCLUSIONS: We propose that SHG microscopy can be utilized to visualize significant structural artifacts in sectioned median nerves following in vivo stretch injury. Based on the findings in this study, we believe that the in vivo application of SHG microscopy should be further investigated as a means for real-time, intra-operative, quantitative assessment of nerve damage.
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Affiliation(s)
- Matthew J Gluck
- Leni & Peter W. May Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, United States.
| | - Surabhi Vijayaraghavan
- Leni & Peter W. May Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, United States
| | - Elaine B Sinclair
- Leni & Peter W. May Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, United States
| | - Asad Ashraf
- Leni & Peter W. May Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, United States
| | - Michael R Hausman
- Leni & Peter W. May Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, United States
| | - Paul J Cagle
- Leni & Peter W. May Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, United States
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6
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Zeitoune AA, Luna JS, Salas KS, Erbes L, Cesar CL, Andrade LA, Carvahlo HF, Bottcher-Luiz F, Casco VH, Adur J. Epithelial Ovarian Cancer Diagnosis of Second-Harmonic Generation Images: A Semiautomatic Collagen Fibers Quantification Protocol. Cancer Inform 2017; 16:1176935117690162. [PMID: 28469386 PMCID: PMC5392028 DOI: 10.1177/1176935117690162] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 09/26/2016] [Accepted: 01/02/2017] [Indexed: 11/20/2022] Open
Abstract
A vast number of human pathologic conditions are directly or indirectly related to tissular collagen structure remodeling. The nonlinear optical microscopy second-harmonic generation has become a powerful tool for imaging biological tissues with anisotropic hyperpolarized structures, such as collagen. During the past years, several quantification methods to analyze and evaluate these images have been developed. However, automated or semiautomated solutions are necessary to ensure objectivity and reproducibility of such analysis. This work describes automation and improvement methods for calculating the anisotropy (using fast Fourier transform analysis and the gray-level co-occurrence matrix). These were applied to analyze biopsy samples of human ovarian epithelial cancer at different stages of malignancy (mucinous, serous, mixed, and endometrial subtypes). The semiautomation procedure enabled us to design a diagnostic protocol that recognizes between healthy and pathologic tissues, as well as between different tumor types.
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Affiliation(s)
- Angel A Zeitoune
- Biofotónica y Procesamiento de Información Biológica (ByPIB), Centro de Investigación y Transferencia de Entre Ríos (CITER), CONICET-UNER, Entre Ríos, Argentina.,Microscopy Laboratory Applied to Molecular and Cellular Studies, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina
| | - Johana Sj Luna
- Laboratory Applied to Non-Ionizing Radiation, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina
| | - Kynthia Sanchez Salas
- Laboratory Applied to Non-Ionizing Radiation, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina
| | - Luciana Erbes
- Biofotónica y Procesamiento de Información Biológica (ByPIB), Centro de Investigación y Transferencia de Entre Ríos (CITER), CONICET-UNER, Entre Ríos, Argentina.,Microscopy Laboratory Applied to Molecular and Cellular Studies, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina
| | - Carlos L Cesar
- National Institute of Science and Technology on Photonics Applied to Cell Biology (INFABiC), São Paulo, Brazil.,Department of Physics, Federal University of Ceará (UFC), Fortaleza, Brazil
| | - Liliana Ala Andrade
- Department of Obstetrics and Gynecology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Brazil
| | - Hernades F Carvahlo
- National Institute of Science and Technology on Photonics Applied to Cell Biology (INFABiC), São Paulo, Brazil.,Department of Structural and Functional Biology, Biology Institute, State University of Campinas (UNICAMP), São Paulo, Brazil
| | - Fátima Bottcher-Luiz
- National Institute of Science and Technology on Photonics Applied to Cell Biology (INFABiC), São Paulo, Brazil.,Department of Pathology of the Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Brazil
| | - Victor H Casco
- Microscopy Laboratory Applied to Molecular and Cellular Studies, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina
| | - Javier Adur
- Biofotónica y Procesamiento de Información Biológica (ByPIB), Centro de Investigación y Transferencia de Entre Ríos (CITER), CONICET-UNER, Entre Ríos, Argentina.,Microscopy Laboratory Applied to Molecular and Cellular Studies, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina.,Laboratory Applied to Non-Ionizing Radiation, Engineering School, National University of Entre Ríos, Entre Ríos, Argentina
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7
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Abstract
Second-harmonic generation (SHG) microscopy is a powerful microscopy technique for imaging collagen and other biological molecules using a label-free approach. SHG microscopy offers the advantages of a nonlinear imaging modality together with those ones of a coherent technique. These features make SHG microscopy the ideal tool for imaging collagen at high resolution and for characterizing its organization at various hierarchical levels. Considering that collagen organization plays a crucial role in fibrosis and in its development, it would be beneficial for the researcher working in the field of fibrosis to have a manual listing crucial points to be considered when imaging collagen using SHG microscopy. This chapter provides an answer to this demand with state-of-the-art protocols, methods, and laboratory tips related to SHG microscopy. We also discuss advantages and limitations of the use of SHG for studying fibrosis.
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Affiliation(s)
- Riccardo Cicchi
- National Institute of Optics, National Research Council (INO-CNR), Sesto Fiorentino, Italy.
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, Sesto Fiorentino, Italy.
| | - Francesco S Pavone
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, Sesto Fiorentino, Italy
- Department of Physics, University of Florence, Sesto Fiorentino, Italy
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8
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Cicchi R, Baria E, Matthäus C, Lange M, Lattermann A, Brehm BR, Popp J, Pavone FS. Non-linear imaging and characterization of atherosclerotic arterial tissue using combined SHG and FLIM microscopy. J Biophotonics 2015; 8:347-356. [PMID: 25760563 DOI: 10.1002/jbio.201400142] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 02/09/2015] [Accepted: 02/23/2015] [Indexed: 06/04/2023]
Abstract
Atherosclerosis is one of the leading causes of death in the Western World and its characterization is extremely interesting from the diagnostic point of view. Here, we employed combined SHG-FLIM microscopy to characterize arterial tissue with atherosclerosis. The shorter mean fluorescence lifetime measured within plaque depositions (1260 ± 80 ps) with respect to normal arterial wall (1480 ± 100 ps) allowed discriminating collagen from lipids. SHG measurements and image analysis demonstrated that the normal arterial wall has a more anisotropic Aspect Ratio (0.37 ± 0.02) with respect to plaque depositions (0.61 ± 0.02) and that the correlation length can be used for discriminating collagen fibre bundles (2.0 ± 0.6 µm) from cholesterol depositions (4.1 ± 0.6 µm). The presented method has the potential to find place in a clinical setting as well as to be applied in vivo in the near future. Graphic composition of SHG and FLIM images representing normal arterial wall and plaque depositions.
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Affiliation(s)
- Riccardo Cicchi
- National Institute of Optics, National Research Council (INO-CNR), Largo E. Fermi 6, 50125, Florence, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy.
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9
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Mauri A, Ehret AE, Perrini M, Maake C, Ochsenbein-Kölble N, Ehrbar M, Oyen ML, Mazza E. Deformation mechanisms of human amnion: Quantitative studies based on second harmonic generation microscopy. J Biomech 2015; 48:1606-13. [PMID: 25805698 DOI: 10.1016/j.jbiomech.2015.01.045] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [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: 01/30/2015] [Accepted: 01/31/2015] [Indexed: 11/15/2022]
Abstract
Multiphoton microscopy has proven to be a versatile tool to analyze the three-dimensional microstructure of the fetal membrane and the mechanisms of deformation on the length scale of cells and the collagen network. In the present contribution, dedicated microscopic tools for in situ mechanical characterization of tissue under applied mechanical loads and the related methods for data interpretation are presented with emphasis on new stepwise monotonic uniaxial experiments. The resulting microscopic parameters are consistent with previous ones quantified for cyclic and relaxation tests, underlining the reliability of these techniques. The thickness reduction and the substantial alignment of collagen fiber bundles in the compact and fibroblast layer starting at very small loads are highlighted, which challenges the definition of a reference configuration in terms of a force threshold. The findings presented in this paper intend to inform the development of models towards a better understanding of fetal membrane deformation and failure, and thus of related problems in obstetrics and other clinical conditions.
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Affiliation(s)
- Arabella Mauri
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.
| | - Alexander E Ehret
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Michela Perrini
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland; Department of Obstetrics, University Hospital Zürich, 8091 Zurich, Switzerland
| | - Caroline Maake
- Institute of Anatomy, University of Zurich, 8057 Zurich, Switzerland
| | | | - Martin Ehrbar
- Department of Obstetrics, University Hospital Zürich, 8091 Zurich, Switzerland
| | - Michelle L Oyen
- Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
| | - Edoardo Mazza
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland; Swiss Federal Laboratories for Materials Science and Technology, EMPA, 8600 Dübendorf, Switzerland
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10
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Mauri A, Perrini M, Ehret AE, De Focatiis DSA, Mazza E. Time-dependent mechanical behavior of human amnion: macroscopic and microscopic characterization. Acta Biomater 2015; 11:314-23. [PMID: 25240983 DOI: 10.1016/j.actbio.2014.09.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [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: 05/28/2014] [Revised: 08/19/2014] [Accepted: 09/10/2014] [Indexed: 11/16/2022]
Abstract
Characterizing the mechanical response of the human amnion is essential to understand and to eventually prevent premature rupture of fetal membranes. In this study, a large set of macroscopic and microscopic mechanical tests have been carried out on fresh unfixed amnion to gain insight into the time-dependent material response and the underlying mechanisms. Creep and relaxation responses of amnion were characterized in macroscopic uniaxial tension, biaxial tension and inflation configurations. For the first time, these experiments were complemented by microstructural information from nonlinear laser scanning microscopy performed during in situ uniaxial relaxation tests. The amnion showed large tension reduction during relaxation and small inelastic strain accumulation in creep. The short-term relaxation response was related to a concomitant in-plane and out-of-plane contraction, and was dependent on the testing configuration. The microscopic investigation revealed a large volume reduction at the beginning, but no change of volume was measured long-term during relaxation. Tension-strain curves normalized with respect to the maximum strain were highly repeatable in all configurations and allowed the quantification of corresponding characteristic parameters. The present data indicate that dissipative behavior of human amnion is related to two mechanisms: (i) volume reduction due to water outflow (up to ∼20 s) and (ii) long-term dissipative behavior without macroscopic deformation and no systematic global reorientation of collagen fibers.
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Affiliation(s)
- Arabella Mauri
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.
| | - Michela Perrini
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland; Department of Obstetrics, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Alexander E Ehret
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Davide S A De Focatiis
- Division of Materials, Mechanics and Structures, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
| | - Edoardo Mazza
- Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland; Swiss Federal Laboratories for Materials Science and Technology, EMPA, 8600 Dübendorf, Switzerland
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11
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Cicchi R, Kapsokalyvas D, Troiano M, Campolmi P, Morini C, Massi D, Cannarozzo G, Lotti T, Pavone FS. In vivo non-invasive monitoring of collagen remodelling by two-photon microscopy after micro-ablative fractional laser resurfacing. J Biophotonics 2014. [PMID: 24339127 DOI: 10.1002/jbio.v7.11/12] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Non-linear optical microscopy is becoming popular as a non-invasive in vivo imaging modality in dermatology. In this study, combined TPF and SHG microscopy were used to monitor collagen remodelling in vivo after micro-ablative fractional laser resurfacing. Papillary dermis of living subjects, covering a wide age range, was imaged immediately before and forty days after treatment. A qualitative visual examination of acquired images demonstrated an age-dependent remodelling effect on collagen. Additional quantitative analysis of new collagen production was performed by means of two image analysis methods. A higher increase in SHG to TPF ratio, corresponding to a stronger treatment effectiveness, was found in older subjects, whereas the effect was found to be negligible in young, and minimal in middle age subjects. Analysis of collagen images also showed a dependence of the treatment effectiveness with age but with controversial results. While the diagnostic potential of in vivo multiphoton microscopy has already been demonstrated for skin cancer and other skin diseases, here we first successfully explore its potential use for a non-invasive follow-up of a laser-based treatment.
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Affiliation(s)
- Riccardo Cicchi
- National Institute of Optics, National Research Council INO-CNR, Largo E. Fermi 6, 50125, Florence, Italy; European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy.
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12
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Cicchi R, Kapsokalyvas D, Troiano M, Campolmi P, Morini C, Massi D, Cannarozzo G, Lotti T, Pavone FS. In vivo non-invasive monitoring of collagen remodelling by two-photon microscopy after micro-ablative fractional laser resurfacing. J Biophotonics 2014; 7:914-925. [PMID: 24339127 DOI: 10.1002/jbio.201300124] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [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: 08/08/2013] [Revised: 10/02/2013] [Accepted: 11/12/2013] [Indexed: 06/03/2023]
Abstract
Non-linear optical microscopy is becoming popular as a non-invasive in vivo imaging modality in dermatology. In this study, combined TPF and SHG microscopy were used to monitor collagen remodelling in vivo after micro-ablative fractional laser resurfacing. Papillary dermis of living subjects, covering a wide age range, was imaged immediately before and forty days after treatment. A qualitative visual examination of acquired images demonstrated an age-dependent remodelling effect on collagen. Additional quantitative analysis of new collagen production was performed by means of two image analysis methods. A higher increase in SHG to TPF ratio, corresponding to a stronger treatment effectiveness, was found in older subjects, whereas the effect was found to be negligible in young, and minimal in middle age subjects. Analysis of collagen images also showed a dependence of the treatment effectiveness with age but with controversial results. While the diagnostic potential of in vivo multiphoton microscopy has already been demonstrated for skin cancer and other skin diseases, here we first successfully explore its potential use for a non-invasive follow-up of a laser-based treatment.
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Affiliation(s)
- Riccardo Cicchi
- National Institute of Optics, National Research Council INO-CNR, Largo E. Fermi 6, 50125, Florence, Italy; European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy.
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13
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Cicchi R, Matthäus C, Meyer T, Lattermann A, Dietzek B, Brehm BR, Popp J, Pavone FS. Characterization of collagen and cholesterol deposition in atherosclerotic arterial tissue using non-linear microscopy. J Biophotonics 2014; 7:135-43. [PMID: 23861313 DOI: 10.1002/jbio.201300055] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [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: 04/02/2013] [Revised: 06/03/2013] [Accepted: 06/26/2013] [Indexed: 05/05/2023]
Abstract
Atherosclerosis is characterized by the accumulation of lipids within the arterial wall and is commonly diagnosed using standard histology. Non-linear microscopy represents a possible label-free alternative to standard diagnostic methods for imaging various tissue components. Here we employ SHG and CARS microscopy for imaging thin cross-sections of atherosclerotic arterial tissue, demonstrating that both cholesterol deposition in the lumen and collagen in the normal arterial wall can be imaged and discriminated using SHG and CARS microscopy. A simultaneous detection of both forward and backward scattered SHG signals allows distinguishing collagen fibres from cholesterol. Further analysis, based on image pattern evaluation algorithms, is used to characterize collagen organization in the healthy arterial wall against collagen found within plaques. Different values of fibre mean size, distribution and anisotropy are calculated for lumen and media prospectively allowing for automated classification of atherosclerotic lesions. The presented method represents a promising diagnostic tool for evaluating atherosclerotic tissue.
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Affiliation(s)
- Riccardo Cicchi
- National Institute of Optics, National Research Council INO-CNR, Largo E. Fermi 6, 50125, Florence, Italy; European Laboratory for Non-linear Spectroscopy LENS, Via Nello Carrara 1, 50019, Sesto Fiorentino, Italy.
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