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Matsuzaki S, Hase E, Takanari H, Hayashi Y, Hayashi Y, Oshikata H, Minamikawa T, Kimura S, Ichimura-Shimizu M, Yasui T, Harada M, Tsuneyama K. Quantification of collagen fiber properties in alcoholic liver fibrosis using polarization-resolved second harmonic generation microscopy. Sci Rep 2023; 13:22100. [PMID: 38092851 PMCID: PMC10719293 DOI: 10.1038/s41598-023-48887-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 11/30/2023] [Indexed: 12/17/2023] Open
Abstract
Liver fibrosis is assessed mainly by conventional staining or second harmonic generation (SHG) microscopy, which can only provide collagen content in fibrotic area. We propose to use polarization-resolved SHG (PR-SHG) microscopy to quantify liver fibrosis in terms of collagen fiber orientation and crystallization. Liver samples obtained from autopsy cases with fibrosis stage of F0-F4 were evaluated with an SHG microscope, and 12 consecutive PR-SHG images were acquired while changing the polarization azimuth angle of the irradiated laser from 0° to 165° in 15° increments using polarizer. The fiber orientation angle (φ) and degree (ρ) of collagen were estimated from the images. The SHG-positive area increased as the fibrosis stage progressed, which was well consistent with Sirius Red staining. The value of φ was random regardless of fibrosis stage. The mean value of ρ (ρ-mean), which represents collagen fiber crystallinity, varied more as fibrosis progressed to stage F3, and converged to a significantly higher value in F4 than in other stages. Spatial dispersion of ρ (ρ-entropy) also showed increased variation in the stage F3 and decreased variation in the stage F4. It was shown that PR-SHG could provide new information on the properties of collagen fibers in human liver fibrosis.
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Affiliation(s)
- Saya Matsuzaki
- Department of Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School of Medicine, Tokushima, Japan
| | - Eiji Hase
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
| | - Hiroki Takanari
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
- Department of Legal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Yuri Hayashi
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
- Tokushima University Faculty of Medicine, Tokushima, Japan
| | - Yusaku Hayashi
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
- Tokushima University Faculty of Medicine, Tokushima, Japan
| | - Haruto Oshikata
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
- Tokushima University Faculty of Medicine, Tokushima, Japan
| | - Takeo Minamikawa
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
| | | | - Mayuko Ichimura-Shimizu
- Department of Pathology and Laboratory Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School of Medicine, 3-18-15, Kuramoto, Tokushima, 770-8503, Japan
| | - Takeshi Yasui
- Division of Next-Generation Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
| | - Masafumi Harada
- Department of Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School of Medicine, Tokushima, Japan
| | - Koichi Tsuneyama
- Division of Interdisciplinary Research for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan.
- Department of Pathology and Laboratory Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School of Medicine, 3-18-15, Kuramoto, Tokushima, 770-8503, Japan.
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Mandair GS, Steenhuis P, Ignelzi MA, Morris MD. Bone quality assessment of osteogenic cell cultures by Raman microscopy. JOURNAL OF RAMAN SPECTROSCOPY : JRS 2019; 50:360-370. [PMID: 37035410 PMCID: PMC10081538 DOI: 10.1002/jrs.5521] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The use of autologous stem/progenitor cells represents a promising approach to the repair of craniofacial bone defects. The calvarium is recognized as a viable source of stem/progenitor cells that can be transplanted in vitro to form bone. However, it is unclear if bone formed in cell culture is similar in quality to that found in native bone. In this study, the quality of bone mineral formed in osteogenic cell cultures were compared against calvarial bone from postnatal mice. Given the spectroscopic resemblance that exists between cell and collagen spectra, the feasibility of extracting information on cell activity and bone matrix quality were also examined. Stem/progenitor cells isolated from fetal mouse calvaria were cultured onto fused-quartz slides under osteogenic differentiation conditions for 28 days. At specific time intervals, slides were removed and analyzed by Raman microscopy and mineral staining techniques. We show that bone formed in culture at Day 28 resembled calvarial bone from 1-day-old postnatal mice with comparable mineralization, mineral crystallinity, and collagen crosslinks ratios. In contrast, bone formed at Day 28 contained a lower degree of ordered collagen fibrils compared with 1-day-old postnatal bone. Taken together, bone formed in osteogenic cell culture exhibited progressive matrix maturation and mineralization but could not fully replicate the high degree of collagen fibril order found in native bone.
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Affiliation(s)
- Gurjit S. Mandair
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, Michigan
| | - Pieter Steenhuis
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, Michigan
| | - Michael A. Ignelzi
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, The University of North Carolina, Chapel Hill, North Carolina
| | - Michael D. Morris
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan
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Sato K, Matsubara O, Hase E, Minamikawa T, Yasui T. Quantitative in situ time-series evaluation of osteoblastic collagen synthesis under cyclic strain using second-harmonic-generation microscopy. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-8. [PMID: 30635995 PMCID: PMC6975189 DOI: 10.1117/1.jbo.24.3.031019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 12/11/2018] [Indexed: 06/09/2023]
Abstract
The aim of this study is to evaluate the osteoblastic collagen synthesis under mechanical stimulation using second-harmonic-generation (SHG) microscopy. We apply SHG microscopy to monitor the collagen fibers synthesized by osteoblast-like cells (MC3T3-E1) without the need for fixation and staining. To quantitatively evaluate the influence of mechanical stimulation on osteoblastic collagen synthesis, we compare SHG images of osteoblast-synthesized collagen fibers with and without a cyclic stretch stimulus applied using a lab-made stretching device. We acquire SHG images every 7 days for 3 weeks at different stimulus conditions (5 min/day and 3 h/day with a strain magnitude of 5% and a frequency of 0.5 Hz). Image analysis of the average SHG intensity indicates that the amount of osteoblastic collagen synthesis is significantly enhanced by the cyclic stretch compared with the nonstretched condition, while there is no significant difference between the two mechanical stimulation conditions. Furthermore, the maturity of the collagen fibers in the early stage of bone formation is not affected by the mechanical stimulation. The results can be used in bone regenerative medicine to apply feedback control of collagen synthesis by artificial stimulation.
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Affiliation(s)
- Katsuya Sato
- Tokushima University, Graduate School of Technology, Industrial and Social Sciences, Tokushima City, Tokushima, Japan
| | - Oki Matsubara
- Tokushima University, Graduate School of Technology, Industrial and Social Sciences, Tokushima City, Tokushima, Japan
| | - Eiji Hase
- Japan Synchrotron Radiation Research Institute, Research and Utilization Division, Sayo, Hyogo, Japan
| | - Takeo Minamikawa
- Tokushima University, Graduate School of Technology, Industrial and Social Sciences, Tokushima City, Tokushima, Japan
| | - Takeshi Yasui
- Tokushima University, Graduate School of Technology, Industrial and Social Sciences, Tokushima City, Tokushima, Japan
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