1
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Navarrete Á, Utrera A, Rivera E, Latorre M, Celentano DJ, García-Herrera CM. An inverse fitting strategy to determine the constrained mixture model parameters: application in patient-specific aorta. Front Bioeng Biotechnol 2023; 11:1301988. [PMID: 38053847 PMCID: PMC10694237 DOI: 10.3389/fbioe.2023.1301988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 11/06/2023] [Indexed: 12/07/2023] Open
Abstract
The Constrained Mixture Model (CMM) is a novel approach to describe arterial wall mechanics, whose formulation is based on a referential physiological state. The CMM considers the arterial wall as a mixture of load-bearing constituents, each of them with characteristic mass fraction, material properties, and deposition stretch levels from its stress-free state to the in-vivo configuration. Although some reports of this model successfully assess its capabilities, they barely explore experimental approaches to model patient-specific scenarios. In this sense, we propose an iterative fitting procedure of numerical-experimental nature to determine material parameters and deposition stretch values. To this end, the model has been implemented in a finite element framework, and it is calibrated using reported experimental data of descending thoracic aorta. The main results obtained from the proposed procedure consist of a set of material parameters for each constituent. Moreover, a relationship between deposition stretches and residual strain measurements (opening angle and axial stretch) has been numerically proved, establishing a strong consistency between the model and experimental data.
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Affiliation(s)
- Álvaro Navarrete
- Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, USACH, Santiago de Chile, Chile
| | - Andrés Utrera
- Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, USACH, Santiago de Chile, Chile
| | - Eugenio Rivera
- Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, USACH, Santiago de Chile, Chile
| | - Marcos Latorre
- Center for Research and Innovation in Bioengineering, Universitat Politècnica de València, València, Spain
| | - Diego J. Celentano
- Departamento de Ingeniería Mecánica y Metalúrgica, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile
| | - Claudio M. García-Herrera
- Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, USACH, Santiago de Chile, Chile
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2
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Spencer RKW, Ha BY, Saeidi N. Interplay between nematic and cholesteric interactions in self-consistent field theory. Phys Rev E 2022; 105:054501. [PMID: 35706232 DOI: 10.1103/physreve.105.054501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 03/29/2022] [Indexed: 06/15/2023]
Abstract
Chirality is a design feature of a number of biomolecules (e.g., collagen). In these molecules, cholesteric (chiral-nematic) behavior emerges from a combination of the tendency for the biopolymers to align (nematic interactions) and for the alignment direction to change with position, rotating around an axis normal to the alignment direction. This paper presents self-consistent field theory (SCFT) of chiral-nematic polymers, which takes into account polymer flexibility and the orientational degrees of freedom of polymer segments. Using the resulting SCFT, we construct a phase diagram showing regions of stability for isotropic, nematic, and cholesteric phases. Furthermore, we find that nematic interactions can stabilize the cholesteric phase, pushing the isotropic-cholesteric phase transition to lower cholesteric interaction strength, until the isotropic-nematic-cholesteric triple point is reached.
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Affiliation(s)
- Russell K W Spencer
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
| | - Bae-Yeun Ha
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
| | - Nima Saeidi
- Department of Surgery, The Center for Engineering in Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA
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3
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Spencer RKW, Ha BY, Saeidi N. Self-consistent field theory of chiral nematic worm-like chains. J Chem Phys 2022; 156:114902. [PMID: 35317576 PMCID: PMC8934192 DOI: 10.1063/5.0078937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Many macromolecules of biological and technological interest are both chiral and semi-flexible. DNA and collagen are good examples. Such molecules often form chiral nematic (or cholesteric) phases, as is well-documented in collagen and chitin. This work presents a method for studying cholesteric phases in the highly successful self-consistent field theory of worm-like chains, offering a new way of studying many biologically relevant molecules. The method involves an effective Hamiltonian with a chiral term inspired by the Oseen-Frank (OF) model of liquid crystals. This method is then used to examine the formation of cholesteric phases in chiral-nematic worm-like chains as a function of polymer flexibility, as well as the optimal cholesteric pitch and distribution of polymer segment orientations. Our approach not only allows for the determination of the isotropic-cholesteric transition and segment distributions, beyond what the OF model promises, but also explicitly incorporates polymer flexibility into the study of the cholesteric phase, offering a more complete understanding of the behavior of semiflexible chiral-nematic polymers.
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Affiliation(s)
- Russell K. W. Spencer
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Bae-Yeun Ha
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Authors to whom correspondence should be addressed: and
| | - Nima Saeidi
- Department of Surgery, The Center for Engineering in Medicine (CEM), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA
- Authors to whom correspondence should be addressed: and
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4
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Vielreicher M, Bozec A, Schett G, Friedrich O. Murine Metatarsus Bone and Joint Collagen-I Fiber Morphologies and Networks Studied With SHG Multiphoton Imaging. Front Bioeng Biotechnol 2021; 9:608383. [PMID: 34178952 PMCID: PMC8226188 DOI: 10.3389/fbioe.2021.608383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 05/10/2021] [Indexed: 11/13/2022] Open
Abstract
Chronic inflammatory disease of bones and joints (e.g., rheumatoid arthritis, gout, etc.), but also acute bone injury and healing, or degenerative resorptive processes inducing osteoporosis, are associated with structural remodeling that ultimately have impact on function. For instance, bone stability is predominantly orchestrated by the structural arrangement of extracellular matrix fibrillar networks, i.e., collagen-I, -IV, elastin, and other proteins. These components may undergo distinct network density and orientation alterations that may be causative for decreased toughness, resilience and load bearing capacity or even increased brittleness. Diagnostic approaches are usually confined to coarse imaging modalities of X-ray or computer tomography that only provide limited optical resolution and lack specificity to visualize the fibrillary collagen network. However, studying collagen structure at the microscopic scale is of considerable interest to understand the mechanisms of tissue pathologies. Multiphoton Second Harmonic Generation (SHG) microscopy, is able to visualize the sterical topology of the collagen-I fibrillar network in 3D, in a minimally invasive and label-free manner. Penetration depths exceed those of conventional visible light imaging and can be further optimized through employing decalcification or optical clearing processing ex vivo. The goal of this proof-of-concept study was to use SHG and two-photon excited fluorescence (2-PEF) imaging to mainly characterize the fibrillary collagen organization within ex vivo decalcified normal mouse metatarsus bone and joint. The results show that the technique resolved the fibrillar collagen network of complete bones and joints with almost no artifacts and enabled to study the complex collagen-I networks with various fiber types (straight, crimped) and network arrangements of mature and woven bone with high degree of detail. Our imaging approach enabled to identify cavities within both cortical and trabecular bone architecture as well as interfaces with sharply changing fiber morphology and network structure both within bone, in tendon and ligament and within joint areas. These possibilities are highly advantageous since the technology can easily be applied to animal models, e.g., of rheumatoid arthritis to study structural effects of chronic joint inflammation, and to many others and to compare to the structure of human bone.
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Affiliation(s)
- Martin Vielreicher
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Aline Bozec
- Department of Internal Medicine 3 - Rheumatology and Immunology, University Clinic, Erlangen, Germany
| | - Georg Schett
- Department of Internal Medicine 3 - Rheumatology and Immunology, University Clinic, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
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5
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Nesrullajev A, Altınay Y. Lyotropic liquid crystalline hexagonal mesophase. Thermo-morphologic and magneto-morphologic transformations, electrical conductivity and optical refractive properties: Effect of optically active compounds. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Baria E, Nesi G, Santi R, Maio V, Massi D, Pratesi C, Cicchi R, Pavone FS. Improved label-free diagnostics and pathological assessment of atherosclerotic plaques through nonlinear microscopy. JOURNAL OF BIOPHOTONICS 2018; 11:e201800106. [PMID: 29931805 DOI: 10.1002/jbio.201800106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/20/2018] [Indexed: 06/08/2023]
Abstract
Coronary heart disease is the most common type of heart disease caused by atherosclerosis. In fact, an arterial wall lesion centered on the accumulation of cholesterol-rich lipids and the accompanying inflammatory response generates a plaque, whose rupture may result in a thrombus with fatal consequences. Plaque characterization for assessing the severity of atherosclerosis is generally performed through standard histopathological examination based on hematoxylin/eosin staining, which is operator-dependent and requires relatively long procedures. In this framework, nonlinear optical microscopy is a valid, label-free alternative to standard diagnostic methods. We combined second-harmonic generation (SHG), two-photon excited fluorescence (TPEF) and fluorescence lifetime imaging microscopy in a multimodal scheme for obtaining morphological and molecular information on human carotid ex vivo specimens affected by atherosclerosis. In this study, discrimination between different tissues within the atherosclerotic plaque was achieved based on both lifetime, TPEF-to-SHG ratio, and image pattern analysis. The presented methodology aims to be a starting point for future fully automated and fast characterization of atherosclerotic biopsies; moreover, it could be extended to the study of other tissues and pathologies. Combined TPEF/SHG mapping of a carotid specimen affected by atherosclerosis.
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Affiliation(s)
- Enrico Baria
- National Institute of Optics, National Research Council, Florence, Italy
| | - Gabriella Nesi
- Department of Surgery and Translational Medicine, University of Florence, Florence, Italy
| | - Raffaella Santi
- Department of Surgery and Translational Medicine, University of Florence, Florence, Italy
| | - Vincenza Maio
- Department of Surgery and Translational Medicine, University of Florence, Florence, Italy
| | - Daniela Massi
- Department of Surgery and Translational Medicine, University of Florence, Florence, Italy
| | - Carlo Pratesi
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Riccardo Cicchi
- National Institute of Optics, National Research Council, Florence, Italy
- European Laboratory for Non-Linear Spectroscopy, University of Florence, Florence, Italy
| | - Francesco S Pavone
- National Institute of Optics, National Research Council, Florence, Italy
- European Laboratory for Non-Linear Spectroscopy, University of Florence, Florence, Italy
- Department of Physics, University of Florence, Florence, Italy
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7
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Tidu A, Ghoubay-Benallaoua D, Teulon C, Asnacios S, Grieve K, Portier F, Schanne-Klein MC, Borderie V, Mosser G. Highly concentrated collagen solutions leading to transparent scaffolds of controlled three-dimensional organizations for corneal epithelial cell colonization. Biomater Sci 2018; 6:1492-1502. [DOI: 10.1039/c7bm01163f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Controlling both organizations and transparency of dense collagen scaffolds.
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Affiliation(s)
- Aurélien Tidu
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
| | - Djida Ghoubay-Benallaoua
- Sorbonne Université
- Institut de la Vision
- INSERM
- CNRS
- Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts
| | - Claire Teulon
- Laboratory for Optics and Biosciences
- LOB
- Ecole Polytechnique
- CNRS
- Inserm
| | - Sophie Asnacios
- Sorbonne Université
- CNRS
- Univ Paris Diderot
- Laboratoire Matière et Systèmes Complexes
- MSC
| | - Kate Grieve
- Sorbonne Université
- Institut de la Vision
- INSERM
- CNRS
- Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts
| | - François Portier
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
| | | | - Vincent Borderie
- Sorbonne Université
- Institut de la Vision
- INSERM
- CNRS
- Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts
| | - Gervaise Mosser
- Sorbonne Université
- CNRS
- Collège de France
- Laboratoire Chimie de la Matière Condensée de Paris
- LCMCP
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8
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Portier F, Teulon C, Nowacka-Perrin A, Guenneau F, Schanne-Klein MC, Mosser G. Stabilization of Collagen Fibrils by Gelatin Addition: A Study of Collagen/Gelatin Dense Phases. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12916-12925. [PMID: 29087724 DOI: 10.1021/acs.langmuir.7b02142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Collagen and its denatured form, gelatin, are biopolymers of fundamental interest in numerous fields ranging from living tissues to biomaterials, food, and cosmetics. This study aims at characterizing mixtures of those biopolymers at high concentrations (up to 100 mg·mL-1) at which collagen has mesogenic properties. We use a structural approach combining polarization-resolved multiphoton microscopy, polarized light microscopy, magnetic resonance imaging, and transmission electron microscopy to analyze gelatin and collagen/gelatin dense phases in their sol and gel states from the macroscopic to the microscopic scale. We first report the formation of a lyotropic crystal phase of gelatin A and show that gelatin must structure itself in particles to become mesogenic. We demonstrate that mixtures of collagen and gelatin phase segregate, preserving the setting of the pure collagen mesophase at a gelatin ratio of up to 20% and generating a biphasic fractal sample at all tested ratios. Moreover, differential scanning calorimetric analysis shows that each protein separates into two populations. Both populations of gelatins are stabilized by the presence of collagen, whereas only one population of collagen molecules is stabilized by the presence of gelatin, most probably those at the interface of the fibrillated microdomains and of the gelatin phase. Although further studies are needed to fully understand the involved mechanism, these new data should have a direct impact on the bioengineering of those two biopolymers.
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Affiliation(s)
- François Portier
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
| | - Claire Teulon
- LOB, Ecole Polytechnique, CNRS, Inserm U1182, Université Paris-Saclay , F-91128 Palaiseau, France
| | - Agnieszka Nowacka-Perrin
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
| | - Flavien Guenneau
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
| | | | - Gervaise Mosser
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
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9
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Genthial R, Beaurepaire E, Schanne-Klein MC, Peyrin F, Farlay D, Olivier C, Bala Y, Boivin G, Vial JC, Débarre D, Gourrier A. Label-free imaging of bone multiscale porosity and interfaces using third-harmonic generation microscopy. Sci Rep 2017; 7:3419. [PMID: 28611441 PMCID: PMC5469828 DOI: 10.1038/s41598-017-03548-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 05/02/2017] [Indexed: 01/17/2023] Open
Abstract
Interfaces provide the structural basis of essential bone functions. In the hierarchical structure of bone tissue, heterogeneities such as porosity or boundaries are found at scales ranging from nanometers to millimeters, all of which contributing to macroscopic properties. To date, however, the complexity or limitations of currently used imaging methods restrict our understanding of this functional integration. Here we address this issue using label-free third-harmonic generation (THG) microscopy. We find that the porous lacuno-canalicular network (LCN), revealing the geometry of osteocytes in the bone matrix, can be directly visualized in 3D with submicron precision over millimetric fields of view compatible with histology. THG also reveals interfaces delineating volumes formed at successive remodeling stages. Finally, we show that the structure of the LCN can be analyzed in relation with that of the extracellular matrix and larger-scale structures by simultaneously recording THG and second-harmonic generation (SHG) signals relating to the collagen organization.
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Affiliation(s)
- Rachel Genthial
- Univ. Grenoble Alpes, LIPHY, F-38000, Grenoble, France.,CNRS, LIPHY, F-38000, Grenoble, France
| | - Emmanuel Beaurepaire
- LOB, Ecole Polytechnique, CNRS, Inserm, Université Paris-Saclay, F-91120, Palaiseau, France
| | | | - Françoise Peyrin
- Université de Lyon, CREATIS, CNRS UMR5220, Inserm U1206, INSA-Lyon, Université Claude Bernard, Lyon 1, France.,ESRF, European Synchrotron Radiation Facility, F-38000, Grenoble, France
| | - Delphine Farlay
- INSERM, UMR 1033, Univ Lyon, Université Claude Bernard Lyon 1, F-69008, Lyon, France.,Université de Lyon, F-69008, Lyon, France
| | - Cécile Olivier
- Université de Lyon, CREATIS, CNRS UMR5220, Inserm U1206, INSA-Lyon, Université Claude Bernard, Lyon 1, France.,ESRF, European Synchrotron Radiation Facility, F-38000, Grenoble, France
| | - Yohann Bala
- INSERM, UMR 1033, Univ Lyon, Université Claude Bernard Lyon 1, F-69008, Lyon, France.,Université de Lyon, F-69008, Lyon, France
| | - Georges Boivin
- INSERM, UMR 1033, Univ Lyon, Université Claude Bernard Lyon 1, F-69008, Lyon, France.,Université de Lyon, F-69008, Lyon, France
| | - Jean-Claude Vial
- Univ. Grenoble Alpes, LIPHY, F-38000, Grenoble, France.,CNRS, LIPHY, F-38000, Grenoble, France
| | - Delphine Débarre
- Univ. Grenoble Alpes, LIPHY, F-38000, Grenoble, France. .,CNRS, LIPHY, F-38000, Grenoble, France.
| | - Aurélien Gourrier
- Univ. Grenoble Alpes, LIPHY, F-38000, Grenoble, France.,CNRS, LIPHY, F-38000, Grenoble, France
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10
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Teulon C, Tidu A, Portier F, Mosser G, Schanne-Klein MC. Probing the 3D structure of cornea-like collagen liquid crystals with polarization-resolved SHG microscopy. OPTICS EXPRESS 2016; 24:16084-98. [PMID: 27410876 DOI: 10.1364/oe.24.016084] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
This work aims at characterizing the three-dimensional organization of liquid crystals composed of collagen, in order to determine the physico-chemical conditions leading to highly organized structures found in biological tissues such as cornea. To that end, we use second-harmonic generation (SHG) microscopy, since aligned collagen structures have been shown to exhibit intrinsic SHG signals. We combine polarization-resolved SHG experiments (P-SHG) with the theoretical derivation of the SHG signal of collagen molecules tilted with respect to the focal plane. Our P-SHG images exhibit striated patterns with variable contrast, as expected from our analytical and numerical calculations for plywood-like nematic structures similar to the ones found in the cornea. This study demonstrates the benefits of P-SHG microscopy for in situ characterization of highly organized biopolymers at micrometer scale, and the unique sensitivity of this nonlinear optical technique to the orientation of collagen molecules.
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11
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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. JOURNAL OF 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] [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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12
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Bancelin S, Decencière E, Machairas V, Albert C, Coradin T, Schanne-Klein MC, Aimé C. Fibrillogenesis from nanosurfaces: multiphoton imaging and stereological analysis of collagen 3D self-assembly dynamics. SOFT MATTER 2014; 10:6651-6657. [PMID: 25058449 DOI: 10.1039/c4sm00819g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The assembly of proteins into fibrillar structures is an important process that concerns different biological contexts, including molecular medicine and functional biomaterials. Engineering of hybrid biomaterials can advantageously provide synergetic interactions of the biopolymers with an inorganic component to ensure specific supramolecular organization and dynamics. To this aim, we designed hybrid systems associating collagen and surface-functionalized silica particles and we built a new strategy to investigate fibrillogenesis processes in such multicomponents systems, working at the crossroads of chemistry, physics and mathematics. The self-assembly process was investigated by bimodal multiphoton imaging coupling second harmonic generation (SHG) and 2 photon excited fluorescence (2PEF). The in-depth spatial characterization of the system was further achieved using the three-dimensional analysis of the SHG/2PEF data via mathematical morphology processing. Quantitation of collagen distribution around particles offers strong evidence that the chemically induced confinement of the protein on the silica nanosurfaces has a key influence on the spatial extension of fibrillogenesis. This new approach is unique in the information it can provide on 3D dynamic hybrid systems and may be extended to other associations of fibrillar molecules with optically responsive nano-objects.
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Affiliation(s)
- Stéphane Bancelin
- Laboratoire d'Optique et Biosciences, CNRS, Ecole Polytechnique, Inserm U696, 91128 Palaiseau, France.
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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. JOURNAL OF 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] [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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14
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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] [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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Altendorf H, Decencière E, Jeulin D, De sa Peixoto P, Deniset-Besseau A, Angelini E, Mosser G, Schanne-Klein MC. Imaging and 3D morphological analysis of collagen fibrils. J Microsc 2012; 247:161-75. [PMID: 22670759 DOI: 10.1111/j.1365-2818.2012.03629.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The recent booming of multiphoton imaging of collagen fibrils by means of second harmonic generation microscopy generates the need for the development and automation of quantitative methods for image analysis. Standard approaches sequentially analyse two-dimensional (2D) slices to gain knowledge on the spatial arrangement and dimension of the fibrils, whereas the reconstructed three-dimensional (3D) image yields better information about these characteristics. In this work, a 3D analysis method is proposed for second harmonic generation images of collagen fibrils, based on a recently developed 3D fibre quantification method. This analysis uses operators from mathematical morphology. The fibril structure is scanned with a directional distance transform. Inertia moments of the directional distances yield the main fibre orientation, corresponding to the main inertia axis. The collaboration of directional distances and fibre orientation delivers a geometrical estimate of the fibre radius. The results include local maps as well as global distribution of orientation and radius of the fibrils over the 3D image. They also bring a segmentation of the image into foreground and background, as well as a classification of the foreground pixels into the preferred orientations. This accurate determination of the spatial arrangement of the fibrils within a 3D data set will be most relevant in biomedical applications. It brings the possibility to monitor remodelling of collagen tissues upon a variety of injuries and to guide tissues engineering because biomimetic 3D organizations and density are requested for better integration of implants.
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Affiliation(s)
- H Altendorf
- Department of Image Processing, Fraunhofer Institute of Industrial Mathematics, Kaiserslautern, Germany.
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Bancelin S, Aimé C, Coradin T, Schanne-Klein MC. In situ three-dimensional monitoring of collagen fibrillogenesis using SHG microscopy. BIOMEDICAL OPTICS EXPRESS 2012; 3:1446-54. [PMID: 22741089 PMCID: PMC3370983 DOI: 10.1364/boe.3.001446] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 05/16/2012] [Accepted: 05/16/2012] [Indexed: 05/03/2023]
Abstract
We implemented in situ time-lapse Second Harmonic Generation (SHG) microscopy to monitor the three-dimensional (3D) self-assembly of collagen in solution. As a proof of concept, we tuned the kinetics of fibril formation by varying the pH and measured the subsequent exponential increase of fibril volume density in SHG images. We obtained significantly different time constants at pH = 6.5 ± 0.3 and at pH = 7.5 ± 0.3. Moreover, we showed that we could focus on the growth of a single isolated collagen fibril because SHG microscopy is sensitive to well-organized fibrils with diameter below the optical resolution. This work illustrates the potential of SHG microscopy for the rational design and characterization of collagen-based biomaterials.
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Affiliation(s)
- S. Bancelin
- Ecole Polytechnique; CNRS; INSERM U696, Laboratoire d'Optique et Biosciences, F-91128 Palaiseau, France
| | - C. Aimé
- UPMC Univ Paris 06; CNRS, Chimie de la Matière Condensée de Paris, Collège de France, 11 place Marcelin Berthelot, F-75005 Paris, France
| | - T. Coradin
- UPMC Univ Paris 06; CNRS, Chimie de la Matière Condensée de Paris, Collège de France, 11 place Marcelin Berthelot, F-75005 Paris, France
| | - M.-C. Schanne-Klein
- Ecole Polytechnique; CNRS; INSERM U696, Laboratoire d'Optique et Biosciences, F-91128 Palaiseau, France
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Iwamoto M, Liu F, Zhong-can OY. Polarization-dependence of optical second harmonic generation for chiral cylindrical structure and explanation for nonlinear optical imaging of cholesteric liquid crystals. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.06.056] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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