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Liu Z, Song J, Fu Q, Zeng N, Ma H. Study on anisotropy orientation due to well-ordered fibrous biological microstructures. JOURNAL OF BIOMEDICAL OPTICS 2024; 29:052919. [PMID: 38420109 PMCID: PMC10901243 DOI: 10.1117/1.jbo.29.5.052919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 10/07/2023] [Accepted: 01/26/2024] [Indexed: 03/02/2024]
Abstract
Significance Most biological fibrous tissues have anisotropic optical characteristics, which originate from scattering by their fibrous microstructures and birefringence of biological macromolecules. The orientation-related anisotropic interpretation is of great value in biological tissue characterization and pathological diagnosis. Aim We focus on intrinsic birefringence and form birefringence in biological tissue samples. By observing and comparing the forward Mueller matrix of typical samples, we can understand the interpretation ability of orientation-related polarization parameters and further distinguish the sources and trends of anisotropy in tissues. Approach For glass fiber, silk fiber, skeletal muscle, and tendon, we construct a forward measuring device to obtain the Mueller matrix image and calculate the anisotropic parameters related to orientation. The statistical analysis method based on polar coordinates can effectively analyze the difference in anisotropic parameters. Results For those birefringent fibers, the statistical distribution of fast-axis values derived from Mueller matrix polar decomposition was found to exhibit bimodal characteristics, which is a key point in distinguishing the single-layer birefringent fiber sample from a layered, multioriented fibrous sample. The application conditions and interference factors of anisotropic orientation parameters are analyzed. Based on the parameters extracted from the orientation bimodal distribution, we can evaluate the relative change trend of intrinsic birefringence and form birefringence in anisotropic samples. Conclusions The cross-vertical bimodal distribution of the fast axis of anisotropic fibers is beneficial to accurately analyze the anisotropic changes in biological tissues. The results imply the potential of anisotropic orientation analysis for applications in pathological diagnosis.
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Affiliation(s)
- Zhidi Liu
- Tsinghua University, Shenzhen International Graduate School, Shenzhen, China
- Tsinghua University, Shenzhen International Graduate School, Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Shenzhen, China
| | - Jiawei Song
- Tsinghua University, Shenzhen International Graduate School, Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Shenzhen, China
- Tsinghua University, Department of Physics, Beijing, China
| | - Qiqi Fu
- Tsinghua University, Shenzhen International Graduate School, Shenzhen, China
- Tsinghua University, Shenzhen International Graduate School, Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Shenzhen, China
| | - Nan Zeng
- Tsinghua University, Shenzhen International Graduate School, Shenzhen, China
- Tsinghua University, Shenzhen International Graduate School, Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Shenzhen, China
| | - Hui Ma
- Tsinghua University, Shenzhen International Graduate School, Shenzhen, China
- Tsinghua University, Shenzhen International Graduate School, Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Shenzhen, China
- Tsinghua University, Department of Physics, Beijing, China
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2
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Sobczak M, Jóźwik A, Kurzynowski P. An integrated model of the human cornea as a linear biaxial birefringent medium. Sci Rep 2024; 14:5077. [PMID: 38429419 PMCID: PMC10907592 DOI: 10.1038/s41598-024-55800-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 02/27/2024] [Indexed: 03/03/2024] Open
Abstract
A novel model of human corneal birefringence is presented. The cornea is treated as a homogeneous biaxial linear birefringent medium in which the values of the binormal axes angle and organization of the main refractive indices vary continuously from the apex to the limbus. In its central part, the angle between binormal axes is 35°, and para centrally, it smoothly increases to 83.7°. The values of the main refractive indices (nx, ny, nz) change, as well as their order, from nx < nz < ny to nz < nx < ny. The transition between these two states was described with a normal distribution (μ = 0.45, σ = 0.1). The presented model corresponds with the experimental results presented in the literature. To our knowledge, it is the first model that presents the anisotropic properties' distributions of the entire cornea. The presented model facilitates a better understanding of the corneal birefringence phenomenon directly related to its lamellar structure.
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Affiliation(s)
- Marcelina Sobczak
- Department of Optics and Photonics, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370, Wrocław, Poland.
- School of Optometry, Indiana University, 800 Atwater Ave, Bloomington, IN, 47405, USA.
| | - Agnieszka Jóźwik
- Department of Optics and Photonics, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Piotr Kurzynowski
- Department of Optics and Photonics, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370, Wrocław, Poland
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3
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Kim J, Dwivedi G, Boughton BA, Sharma A, Lee S. Advances in cellular and tissue-based imaging techniques for sarcoid granulomas. Am J Physiol Cell Physiol 2024; 326:C10-C26. [PMID: 37955119 DOI: 10.1152/ajpcell.00507.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/14/2023]
Abstract
Sarcoidosis embodies a complex inflammatory disorder spanning multiple systems, with its origin remaining elusive. It manifests as the infiltration of inflammatory cells that coalesce into distinctive noncaseous granulomas within afflicted organs. Unraveling this disease necessitates the utilization of cellular or tissue-based imaging methods to both visualize and characterize the biochemistry of these sarcoid granulomas. Although hematoxylin and eosin stain, standard in routine use alongside cytological stains have found utility in diagnosis within clinical contexts, special stains such as Masson's trichrome, reticulin, methenamine silver, and Ziehl-Neelsen provide additional varied perspectives of sarcoid granuloma imaging. Immunohistochemistry aids in pinpointing specific proteins and gene expressions further characterizing these granulomas. Finally, recent advances in spatial transcriptomics promise to divulge profound insights into their spatial orientation and three-dimensional (3-D) molecular mapping. This review focuses on a range of preexisting imaging methods employed for visualizing sarcoid granulomas at the cellular level while also exploring the potential of the latest cutting-edge approaches like spatial transcriptomics and matrix-assisted laser desorption ionization mass spectrometry imaging (MALDI-MSI), with the overarching goal of shedding light on the trajectory of sarcoidosis research.
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Affiliation(s)
- Junwoo Kim
- Department of Advanced Clinical and Translational Cardiovascular Imaging, Harry Perkins Institute of Medical Research, Murdoch, Western Australia, Australia
- School of Medicine, The University of Western Australia, Perth, Western Australia, Australia
| | - Girish Dwivedi
- Department of Advanced Clinical and Translational Cardiovascular Imaging, Harry Perkins Institute of Medical Research, Murdoch, Western Australia, Australia
- School of Medicine, The University of Western Australia, Perth, Western Australia, Australia
- Department of Cardiology, Fiona Stanley Hospital, Murdoch, Western Australia, Australia
| | - Berin A Boughton
- Australian National Phenome Centre, Murdoch University, Murdoch, Western Australia, Australia
| | - Ankur Sharma
- Onco-Fetal Ecosystem Laboratory, Harry Perkins Institute of Medical Research, Nedlands, Western Australia, Australia
- Curtin Medical School, Curtin University, Perth, Western Australia, Australia
| | - Silvia Lee
- Department of Advanced Clinical and Translational Cardiovascular Imaging, Harry Perkins Institute of Medical Research, Murdoch, Western Australia, Australia
- School of Medicine, The University of Western Australia, Perth, Western Australia, Australia
- Curtin Medical School, Curtin University, Perth, Western Australia, Australia
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4
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Chatterjee M, Evans MK, Bell R, Nguyen PK, Kamalitdinov TB, Korntner S, Kuo CK, Dyment NA, Andarawis-Puri N. Histological and immunohistochemical guide to tendon tissue. J Orthop Res 2023; 41:2114-2132. [PMID: 37321983 DOI: 10.1002/jor.25645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 06/02/2023] [Accepted: 06/11/2023] [Indexed: 06/17/2023]
Abstract
Tendons are unique dense connective tissues with discrete zones having specific structure and function. They are juxtaposed with other tissues (e.g., bone, muscle, and fat) with different compositional, structural, and mechanical properties. Additionally, tendon properties change drastically with growth and development, disease, aging, and injury. Consequently, there are unique challenges to performing high quality histological assessment of this tissue. To address this need, histological assessment was one of the breakout session topics at the 2022 Orthopaedic Research Society (ORS) Tendon Conference hosted at the University of Pennsylvania. The purpose of the breakout session was to discuss needs from members of the ORS Tendon Section related to histological procedures, data presentation, knowledge dissemination, and guidelines for future work. Therefore, this review provides a brief overview of the outcomes of this discussion and provides a set of guidelines, based on the perspectives from our laboratories, for histological assessment to assist researchers in their quest to utilize these techniques to enhance the outcomes and interpretations of their studies.
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Affiliation(s)
- Monideepa Chatterjee
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York, USA
| | - Mary K Evans
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Rebecca Bell
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York, USA
| | - Phong K Nguyen
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA
| | - Timur B Kamalitdinov
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Stefanie Korntner
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland, USA
| | - Catherine K Kuo
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
- Department of Orthopaedics, University of Maryland Medical Center, Baltimore, Maryland, USA
| | - Nathaniel A Dyment
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Nelly Andarawis-Puri
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York, USA
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York, USA
- Hospital for Special Surgery, New York, New York, USA
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5
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Gunawardana M, Remedios-Chan M, Sanchez D, Fanter R, Webster S, Webster P, Moss JA, Trinh M, Beliveau M, Ramirez CM, Marzinke MA, Kuo J, Gallay PA, Baum MM. Preclinical Considerations for Long-acting Delivery of Tenofovir Alafenamide from Subdermal Implants for HIV Pre-exposure Prophylaxis. Pharm Res 2023; 40:1657-1672. [PMID: 36418671 PMCID: PMC10421770 DOI: 10.1007/s11095-022-03440-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 11/15/2022] [Indexed: 11/27/2022]
Abstract
PURPOSE Long-acting formulations of the potent antiretroviral prodrug tenofovir alafenamide (TAF) hold potential as biomedical HIV prevention modalities. Here, we present a rigorous comparison of three animal models, C57BL/6 J mice, beagle dogs, and merino sheep for evaluating TAF implant pharmacokinetics (PKs). METHODS Implants delivering TAF over a wide range of controlled release rates were tested in vitro and in mice and dogs. Our existing PK model, supported by an intravenous (IV) dosing dog study, was adapted to analyze mechanistic aspects underlying implant TAF delivery. RESULTS TAF in vitro release in the 0.13 to 9.8 mg d-1 range with zero order kinetics were attained. Implants with equivalent fabrication parameters released TAF in mice and sheep at rates that were not statistically different, but were 3 times higher in dogs. When two implants were placed in the same subcutaneous pocket, a two-week creep to Cmax was observed in dogs for systemic drug and metabolite concentrations, but not in mice. Co-modeling IV and TAF implant PK data in dogs led to an apparent TAF bioavailability of 9.6 in the single implant groups (compared to the IV group), but only 1.5 when two implants were placed in the same subcutaneous pocket. CONCLUSIONS Based on the current results, we recommend using mice and sheep, with macaques as a complementary species, for preclinical TAF implant evaluation with the caveat that our observations may be specific to the implant technology used here. Our report provides fundamental, translatable insights into multispecies TAF delivery via long-acting implants.
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Affiliation(s)
- Manjula Gunawardana
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - Mariana Remedios-Chan
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - Debbie Sanchez
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - Rob Fanter
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - Simon Webster
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - Paul Webster
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - John A Moss
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA
| | - MyMy Trinh
- Certara USA, Inc., Integrated Drug Development, 100 Overlook Center, Suite 101, Princeton, NJ, USA
| | - Martin Beliveau
- Certara USA, Inc., Integrated Drug Development, 100 Overlook Center, Suite 101, Princeton, NJ, USA
| | - Christina M Ramirez
- Department of Biostatistics, UCLA Fielding School of Public Health, University of California, Los Angeles (UCLA), 650 Charles E. Young Drive, Los Angeles, CA, USA
| | - Mark A Marzinke
- Department of Medicine, Johns Hopkins University, 600 N. Wolfe Street, Baltimore, MD, USA
- Department of Pathology, Johns Hopkins University, 600 N. Wolfe Street/Carnegie 417, Baltimore, MD, USA
| | - Joseph Kuo
- Department of Immunology & Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, USA
| | - Philippe A Gallay
- Department of Immunology & Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, USA
| | - Marc M Baum
- Department of Chemistry, Oak Crest Institute of Science, 128-132 W. Chestnut Ave., Monrovia, CA, USA.
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6
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Zhou H, Llanes JP, Lotfi M, Sarntinoranont M, Simmons CS, Subhash G. Label-Free Quantification of Microscopic Alignment in Engineered Tissue Scaffolds by Polarized Raman Spectroscopy. ACS Biomater Sci Eng 2023; 9:3206-3218. [PMID: 37170804 DOI: 10.1021/acsbiomaterials.3c00242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Monitoring of extracellular matrix (ECM) microstructure is essential in studying structure-associated cellular processes, improving cellular function, and for ensuring sufficient mechanical integrity in engineered tissues. This paper describes a novel method to study the microscale alignment of the matrix in engineered tissue scaffolds (ETS) that are usually composed of a variety of biomacromolecules derived by cells. First, a trained loading function was derived from Raman spectra of highly aligned native tissue via principal component analysis (PCA), where prominent changes associated with specific Raman bands (e.g., 1444, 1465, 1605, 1627-1660, and 1665-1689 cm-1) were detected with respect to the polarization angle. These changes were mainly caused by the aligned matrix of many compounds within the tissue relative to the laser polarization, including proteins, lipids, and carbohydrates. Hence this trained function was applied to quantify the alignment within ETS of various matrix components derived by cells. Furthermore, a simple metric called Amplitude Alignment Metric (AAM) was derived to correlate the orientation dependence of polarized Raman spectra of ETS to the degree of matrix alignment. It was found that the AAM was significantly higher in anisotropic ETS than isotropic ones. The PRS method revealed a lower p-value for distinguishing the alignment between these two types of ETS as compared to the microscopic method for detecting fluorescent-labeled protein matrices at a similar microscopic scale. These results indicate that the anisotropy of a complex matrix in engineered tissue can be assessed at the microscopic scale using a PRS-based simple metric, which is superior to the traditional microscopic method. This PRS-based method can serve as a complementary tool for the design and assessment of engineered tissues that mimic the native matrix organizational microstructures.
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Affiliation(s)
- Hui Zhou
- Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Janny Piñeiro Llanes
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Maedeh Lotfi
- Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Malisa Sarntinoranont
- Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Chelsey S Simmons
- Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Ghatu Subhash
- Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, United States
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7
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Becker L, Lu CE, Montes-Mojarro IA, Layland SL, Khalil S, Nsair A, Duffy GP, Fend F, Marzi J, Schenke-Layland K. Raman microspectroscopy identifies fibrotic tissues in collagen-related disorders via deconvoluted collagen type I spectra. Acta Biomater 2023; 162:278-291. [PMID: 36931422 DOI: 10.1016/j.actbio.2023.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 02/28/2023] [Accepted: 03/09/2023] [Indexed: 03/18/2023]
Abstract
Fibrosis is a consequence of the pathological remodeling of extracellular matrix (ECM) structures in the connective tissue of an organ. It is often caused by chronic inflammation, which over time, progressively leads to an excess deposition of collagen type I (COL I) that replaces healthy tissue structures, in many cases leaving a stiff scar. Increasing fibrosis can lead to organ failure and death; therefore, developing methods that potentially allow real-time monitoring of early onset or progression of fibrosis are highly valuable. In this study, the ECM structures of diseased and healthy human tissue from multiple organs were investigated for the presence of fibrosis using routine histology and marker-independent Raman microspectroscopy and Raman imaging. Spectral deconvolution of COL I Raman spectra allowed the discrimination of fibrotic and non-fibrotic COL I fibers. Statistically significant differences were identified in the amide I region of the spectral subpeak at 1608 cm-1, which was deemed to be representative for structural changes in COL I fibers in all examined fibrotic tissues. Raman spectroscopy-based methods in combination with this newly discovered spectroscopic biomarker potentially offer a diagnostic approach to non-invasively track and monitor the progression of fibrosis. STATEMENT OF SIGNIFICANCE: Current diagnosis of fibrosis still relies on histopathological examination with invasive biopsy procedures. Although, several non-invasive imaging techniques such as positron emission tomography, single-photon emission computed tomography and second harmonic generation are gradually employed in preclinical or clinical studies, these techniques are limited in spatial resolution and the morphological interpretation highly relies on individual experience and knowledge. In this study, we propose a non-destructive technique, Raman microspectroscopy, to discriminate fibrotic changes of collagen type I based on a molecular biomarker. The changes of the secondary structure of collagen type I can be identified by spectral deconvolution, which potentially can provide an automatic diagnosis for fibrotic tissues in the clinical applicaion.
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Affiliation(s)
- Lucas Becker
- Institute of Biomedical Engineering, Department for Medical Technologies and Regenerative Medicine, Silcherstr. 7/1, Eberhard Karls University, 72076 Tübingen, Germany; Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University, Tübingen, Germany
| | - Chuan-En Lu
- Institute of Biomedical Engineering, Department for Medical Technologies and Regenerative Medicine, Silcherstr. 7/1, Eberhard Karls University, 72076 Tübingen, Germany
| | | | - Shannon L Layland
- Institute of Biomedical Engineering, Department for Medical Technologies and Regenerative Medicine, Silcherstr. 7/1, Eberhard Karls University, 72076 Tübingen, Germany
| | - Suzan Khalil
- Department of Medicine/Cardiology, Cardiovascular Research Laboratories, David Geffen School of Medicine at UCLA, 675 Charles E. Young Drive South, MRL 3645 Los Angeles, CA, USA
| | - Ali Nsair
- Department of Medicine/Cardiology, Cardiovascular Research Laboratories, David Geffen School of Medicine at UCLA, 675 Charles E. Young Drive South, MRL 3645 Los Angeles, CA, USA
| | - Garry P Duffy
- Anatomy & Regenerative Medicine Institute, School of Medicine, College of Medicine, Nursing and Health Sciences, National University of Ireland Galway, H91 TK33, Galway, Ireland
| | - Falko Fend
- Institute of Pathology and Neuropathology, University Hospital Tübingen, Tübingen, Germany
| | - Julia Marzi
- Institute of Biomedical Engineering, Department for Medical Technologies and Regenerative Medicine, Silcherstr. 7/1, Eberhard Karls University, 72076 Tübingen, Germany; Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University, Tübingen, Germany; NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstr. 55, 72770 Reutlingen, Germany
| | - Katja Schenke-Layland
- Institute of Biomedical Engineering, Department for Medical Technologies and Regenerative Medicine, Silcherstr. 7/1, Eberhard Karls University, 72076 Tübingen, Germany; Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", Eberhard Karls University, Tübingen, Germany; NMI Natural and Medical Sciences Institute at the University of Tübingen, Markwiesenstr. 55, 72770 Reutlingen, Germany.
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8
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Nelson MS, Liu Y, Wilson HM, Li B, Rosado-Mendez IM, Rogers JD, Block WF, Eliceiri KW. Multiscale Label-Free Imaging of Fibrillar Collagen in the Tumor Microenvironment. Methods Mol Biol 2023; 2614:187-235. [PMID: 36587127 DOI: 10.1007/978-1-0716-2914-7_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
With recent advances in cancer therapeutics, there is a great need for improved imaging methods for characterizing cancer onset and progression in a quantitative and actionable way. Collagen, the most abundant extracellular matrix protein in the tumor microenvironment (and the body in general), plays a multifaceted role, both hindering and promoting cancer invasion and progression. Collagen deposition can defend the tumor with immunosuppressive effects, while aligned collagen fiber structures can enable tumor cell migration, aiding invasion and metastasis. Given the complex role of collagen fiber organization and topology, imaging has been a tool of choice to characterize these changes on multiple spatial scales, from the organ and tumor scale to cellular and subcellular level. Macroscale density already aids in the detection and diagnosis of solid cancers, but progress is being made to integrate finer microscale features into the process. Here we review imaging modalities ranging from optical methods of second harmonic generation (SHG), polarized light microscopy (PLM), and optical coherence tomography (OCT) to the medical imaging approaches of ultrasound and magnetic resonance imaging (MRI). These methods have enabled scientists and clinicians to better understand the impact collagen structure has on the tumor environment, at both the bulk scale (density) and microscale (fibrillar structure) levels. We focus on imaging methods with the potential to both examine the collagen structure in as natural a state as possible and still be clinically amenable, with an emphasis on label-free strategies, exploiting intrinsic optical properties of collagen fibers.
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Affiliation(s)
- Michael S Nelson
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI, USA.,Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA
| | - Yuming Liu
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI, USA
| | - Helen M Wilson
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI, USA.,Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA
| | - Bin Li
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI, USA.,Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA.,Morgridge Institute for Research, Madison, WI, USA
| | - Ivan M Rosado-Mendez
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, USA
| | - Jeremy D Rogers
- Morgridge Institute for Research, Madison, WI, USA.,McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, WI, USA
| | - Walter F Block
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, USA
| | - Kevin W Eliceiri
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI, USA. .,Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA. .,Morgridge Institute for Research, Madison, WI, USA. .,Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, USA. .,McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, WI, USA.
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9
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Baroni A, Bouchama L, Dorizzi B, Gottesman Y. Angularly resolved polarization microscopy for birefringent materials with Fourier ptychography. OPTICS EXPRESS 2022; 30:38984-38994. [PMID: 36258450 DOI: 10.1364/oe.469377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 08/11/2022] [Indexed: 06/16/2023]
Abstract
Polarization light microscopy is a very popular approach for structural imaging in optics. So far these methods mainly probe the sample at a fixed angle of illumination. They are consequently only sensitive to the polarization properties along the microscope optical axis. This paper presents a novel method to resolve angularly the polarization properties of birefringent materials, by retrieving quantitatively the spatial variation of their index ellipsoids. Since this method is based on Fourier ptychography microscopy the latter properties are retrieved with a spatial super-resolution factor. An adequate formalism for the Fourier ptychography forward model is introduced to cope with angularly resolved polarization properties. The inverse problem is solved using an unsupervised deep neural network approach that is proven efficient thanks to its performing regularization properties together with its automatic differentiation. Simulated results are reported showing the feasibility of the methods.
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10
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Nguyen PK, Jana A, Huang C, Grafton A, Holt I, Giacomelli M, Kuo CK. Tendon mechanical properties are enhanced via recombinant lysyl oxidase treatment. Front Bioeng Biotechnol 2022; 10:945639. [PMID: 35992359 PMCID: PMC9389157 DOI: 10.3389/fbioe.2022.945639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/12/2022] [Indexed: 11/13/2022] Open
Abstract
Tendon mechanical properties are significantly compromised in adult tendon injuries, tendon-related birth defects, and connective tissue disorders. Unfortunately, there currently is no effective treatment to restore native tendon mechanical properties after postnatal tendon injury or abnormal fetal development. Approaches to promote crosslinking of extracellular matrix components in tendon have been proposed to enhance insufficient mechanical properties of fibrotic tendon after healing. However, these crosslinking agents, which are not naturally present in the body, are associated with toxicity and significant reductions in metabolic activity at concentrations that enhance tendon mechanical properties. In contrast, we propose that an effective method to restore tendon mechanical properties would be to promote lysyl oxidase (LOX)-mediated collagen crosslinking in tendon during adult tissue healing or fetal tissue development. LOX is naturally occurring in the body, and we previously demonstrated LOX-mediated collagen crosslinking to be a critical regulator of tendon mechanical properties during new tissue formation. In this study, we examined the effects of recombinant LOX treatment on tendon at different stages of development. We found that recombinant LOX treatment significantly enhanced tensile and nanoscale tendon mechanical properties without affecting cell viability or collagen content, density, and maturity. Interestingly, both tendon elastic modulus and LOX-mediated collagen crosslink density plateaued at higher recombinant LOX concentrations, which may have been due to limited availability of adjacent lysine residues that are near enough to be crosslinked together. The plateau in crosslink density at higher concentrations of recombinant LOX treatments may have implications for preventing over-stiffening of tendon, though this requires further investigation. These findings demonstrate the exciting potential for a LOX-based therapeutic to enhance tendon mechanical properties via a naturally occurring crosslinking mechanism, which could have tremendous implications for an estimated 32 million acute and chronic tendon and ligament injuries each year in the U.S.
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Affiliation(s)
- Phong K. Nguyen
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States
| | - Aniket Jana
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States
| | - Chi Huang
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
| | - Alison Grafton
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States
| | - Iverson Holt
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States
| | - Michael Giacomelli
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
| | - Catherine K. Kuo
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, United States
- Department of Orthopaedics, University of Rochester Medical Center, Rochester, NY, United States
- Department of Orthopaedics, University of Maryland School of Medicine, Baltimore, MD, United States
- *Correspondence: Catherine K. Kuo,
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11
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Mankar R, Gajjela CC, Bueso-Ramos CE, Yin CC, Mayerich D, Reddy RK. Polarization Sensitive Photothermal Mid-Infrared Spectroscopic Imaging of Human Bone Marrow Tissue. APPLIED SPECTROSCOPY 2022; 76:508-518. [PMID: 35236126 PMCID: PMC10074826 DOI: 10.1177/00037028211063513] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Collagen quantity and integrity play an important role in understanding diseases such as myelofibrosis (MF). Label-free mid-infrared spectroscopic imaging (MIRSI) has the potential to quantify collagen while minimizing the subjective variance observed with conventional histopathology. Infrared (IR) spectroscopy with polarization sensitivity provides chemical information while also estimating tissue dichroism. This can potentially aid MF grading by revealing the structure and orientation of collagen fibers. Simultaneous measurement of collagen structure and biochemical properties can translate clinically into improved diagnosis and enhance our understanding of disease progression. In this paper, we present the first report of polarization-dependent spectroscopic variations in collagen from human bone marrow samples. We build on prior work with animal models and extend it to human clinical biopsies with a practical method for high-resolution chemical and structural imaging of bone marrow on clinical glass slides. This is done using a new polarization-sensitive photothermal mid-infrared spectroscopic imaging scheme that enables sample and source independent polarization control. This technology provides 0.5 µm spatial resolution, enabling the identification of thin (≈1 µm) collagen fibers that were not separable using Fourier Transform Infrared (FT-IR) imaging in the fingerprint region at diffraction-limited resolution ( ≈ 5 µm). Finally, we propose quantitative metrics to identify fiber orientation from discrete band images (amide I and amide II) measured under three polarizations. Previous studies have used a pair of orthogonal polarization measurements, which is insufficient for clinical samples since human bone biopsies contain collagen fibers with multiple orientations. Here, we address this challenge and demonstrate that three polarization measurements are necessary to resolve orientation ambiguity in clinical bone marrow samples. This is also the first study to demonstrate the ability to spectroscopically identify thin collagen fibers (≈1 µm diameter) and their orientations, which is critical for accurate grading of human bone marrow fibrosis.
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Affiliation(s)
- Rupali Mankar
- Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA
| | - Chalapathi C. Gajjela
- Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA
| | - Carlos E. Bueso-Ramos
- Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - C. Cameron Yin
- Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - David Mayerich
- Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA
| | - Rohith K. Reddy
- Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA
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12
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Kislev N, Izgilov R, Adler R, Benayahu D. Exploring the Cell Stemness and the Complexity of the Adipose Tissue Niche. Biomolecules 2021; 11:biom11121906. [PMID: 34944549 PMCID: PMC8699211 DOI: 10.3390/biom11121906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/05/2021] [Accepted: 12/13/2021] [Indexed: 12/12/2022] Open
Abstract
Adipose tissue is a complex organ composed of different cellular populations, including mesenchymal stem and progenitor cells, adipocytes, and immune cells such as macrophages and lymphocytes. These cellular populations alter dynamically during aging or as a response to pathophysiology such as obesity. Changes in the various inflammatory cells are associated with metabolic complications and the development of insulin resistance, indicating that immune cells crosstalk with the adipocytes. Therefore, a study of the cell populations in the adipose tissue and the extracellular matrix maintaining the tissue niche is important for the knowledge on the regulatory state of the organ. We used a combination of methods to study various parameters to identify the composition of the resident cells in the adipose tissue and evaluate their profile. We analyzed the tissue structure and cells based on histology, immune fluorescence staining, and flow cytometry of cells present in the tissue in vivo and these markers’ expression in vitro. Any shift in cells’ composition influences self-renewal of the mesenchymal progenitors, and other cells affect the functionality of adipogenesis.
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13
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Assessing the Effects of VEGF Releasing Microspheres on the Angiogenic and Foreign Body Response to a 3D Printed Silicone-Based Macroencapsulation Device. Pharmaceutics 2021; 13:pharmaceutics13122077. [PMID: 34959358 PMCID: PMC8704798 DOI: 10.3390/pharmaceutics13122077] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/30/2021] [Accepted: 12/01/2021] [Indexed: 11/17/2022] Open
Abstract
Macroencapsulation systems have been developed to improve islet cell transplantation but can induce a foreign body response (FBR). The development of neovascularization adjacent to the device is vital for the survival of encapsulated islets and is a limitation for long-term device success. Previously we developed additive manufactured multi-scale porosity implants, which demonstrated a 2.5-fold increase in tissue vascularity and integration surrounding the implant when compared to a non-textured implant. In parallel to this, we have developed poly(ε-caprolactone-PEG-ε-caprolactone)-b-poly(L-lactide) multiblock copolymer microspheres containing VEGF, which exhibited continued release of bioactive VEGF for 4-weeks in vitro. In the present study, we describe the next step towards clinical implementation of an islet macroencapsulation device by combining a multi-scale porosity device with VEGF releasing microspheres in a rodent model to assess prevascularization over a 4-week period. An in vivo estimation of vascular volume showed a significant increase in vascularity (* p = 0.0132) surrounding the +VEGF vs. −VEGF devices, however, histological assessment of blood vessels per area revealed no significant difference. Further histological analysis revealed significant increases in blood vessel stability and maturity (** p = 0.0040) and vessel diameter size (*** p = 0.0002) surrounding the +VEGF devices. We also demonstrate that the addition of VEGF microspheres did not cause a heightened FBR. In conclusion, we demonstrate that the combination of VEGF microspheres with our multi-scale porous macroencapsulation device, can encourage the formation of significantly larger, stable, and mature blood vessels without exacerbating the FBR.
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14
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Hamilton KD, Chrzan AJ, Michalek AJ. Reflected cross-polarized light microscopy as a method for measuring collagen fiber crimp in musculoskeletal tissues. J Mech Behav Biomed Mater 2021; 125:104953. [PMID: 34763150 DOI: 10.1016/j.jmbbm.2021.104953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/13/2021] [Accepted: 10/27/2021] [Indexed: 11/26/2022]
Abstract
Many musculoskeletal tissues are composed primarily of type I collagen, which takes on a periodic crimp morphology that allows large tensile strains in the tissue. The spatial period of collagen fiber crimp may be used to infer internal strains in a tissue and is typically measured using transmitted cross-polarized light imaging of thin slices. However, slicing may induce specimen distortion and precludes mechanical loading of the specimen during imaging. We hypothesized that reflected cross-polarized light imaging of thick tissue explants would yield crimp period measurements comparable to those obtained from transmitted light imaging of thin slices. We further hypothesized that these measurements would be sensitive to applied uniaxial strain in the fiber direction. These hypotheses were tested by imaging both intervertebral disc outer annulus fibrosus and medial collateral ligament tissue specimens. We found that both transmitted and reflected light yielded similar crimp period measurements for intervertebral disc tissue, with an overall average of 43.5 ± 11.5 μm. Reflected light yielded a significantly higher crimp period with lower variance than transmission through thin specimens (54.1 ± 10.6 μm versus 50.4 ± 16.0 μm) in the ligament. Upon application of axial tension, crimp periods in both fibers increased at a rate of approximately three times the applied strain (with 3.17% applied strain yielding a 9.64 ± 4.4% increase in crimp period in the disc and an 11.7 ± 3.7% increase in the ligament), indicating significant fibril sliding. In support of our hypotheses, these findings suggest that reflected cross-polarized light is a suitable method for measuring collagen fiber crimp in musculoskeletal tissues, both statically and under tension.
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Affiliation(s)
- Kelsey D Hamilton
- Department of Mechanical & Aeronautical Engineering, Clarkson University, Potsdam, NY, USA
| | - Adam J Chrzan
- Department of Mechanical & Aeronautical Engineering, Clarkson University, Potsdam, NY, USA
| | - Arthur J Michalek
- Department of Mechanical & Aeronautical Engineering, Clarkson University, Potsdam, NY, USA.
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15
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Label-free functional and structural imaging of liver microvascular complex in mice by Jones matrix optical coherence tomography. Sci Rep 2021; 11:20054. [PMID: 34625574 PMCID: PMC8501041 DOI: 10.1038/s41598-021-98909-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 09/16/2021] [Indexed: 12/21/2022] Open
Abstract
We demonstrate label-free imaging of the functional and structural properties of microvascular complex in mice liver. The imaging was performed by a custom-built Jones-matrix based polarization sensitive optical coherence tomography (JM-OCT), which is capable of measuring tissue's attenuation coefficient, birefringence, and tiny tissue dynamics. Two longitudinal studies comprising a healthy liver and an early fibrotic liver model were performed. In the healthy liver, we observed distinctive high dynamics beneath the vessel at the initial time point (0 h) and reappearance of high dynamics at 32-h time point. In the early fibrotic liver model, we observed high dynamics signal that reveals a clear network vascular structure by volume rendering. Longitudinal time-course imaging showed that these high dynamics signals faded and decreased over time.
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16
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López De Padilla CM, Coenen MJ, Tovar A, De la Vega RE, Evans CH, Müller SA. Picrosirius Red Staining: Revisiting Its Application to the Qualitative and Quantitative Assessment of Collagen Type I and Type III in Tendon. J Histochem Cytochem 2021; 69:633-643. [PMID: 34549650 DOI: 10.1369/00221554211046777] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Collagen has a major role in the structural organization of tendons. Picrosirius red (PSR) staining viewed under polarized light microscopy is the standard method to evaluate the organization of collagen fibers in tissues. It is also used to distinguish between type I and type III collagen in tissue sections. However, accurate analysis and interpretation of PSR images are challenging because of technical factors and historical misconceptions. The aim of this study was to clarify whether collagen types I and III can be distinguished by PSR staining in rat Achilles tendons, using double immunohistochemistry as the positive control. Our findings showed that PSR staining viewed with polarized light microscopy was suitable for qualitative and quantitative assessment of total collagen but was not able to distinguish collagen types. We found it critical to use a polarizing microscope equipped with a rotating stage; tendon section orientation at 45° with respect to crossed polarizers was optimal for the qualitative and quantitative assessment of collagen organization. Immunohistochemistry was superior to PSR staining for detection of collagen type III. We also compared formalin and Bouin solution as fixatives. Both produced similar birefringence, but formalin-fixed tendons provided higher quality histological detail with both hematoxylin-eosin and immunostaining.
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Affiliation(s)
| | - Michael J Coenen
- Musculoskeletal Gene Therapy Research Laboratory, Mayo Clinic, Rochester, Minnesota
| | - Alejandro Tovar
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Rodolfo E De la Vega
- Musculoskeletal Gene Therapy Research Laboratory, Mayo Clinic, Rochester, Minnesota.,Department cBITE, MERLN Institute, Maastricht University, The Netherlands
| | - Christopher H Evans
- Musculoskeletal Gene Therapy Research Laboratory, Mayo Clinic, Rochester, Minnesota
| | - Sebastian A Müller
- Department of Orthopedic Surgery, Kantonsspital Baselland, University of Basel, Basel, Switzerland (Research Collaborator [limited tenure], Mayo Clinic, Rochester, Minnesota)
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17
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Eren ED, Nijhuis WH, van der Weel F, Dede Eren A, Ansari S, Bomans PHH, Friedrich H, Sakkers RJ, Weinans H, de With G. Multiscale characterization of pathological bone tissue. Microsc Res Tech 2021; 85:469-486. [PMID: 34490967 PMCID: PMC9290679 DOI: 10.1002/jemt.23920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/16/2021] [Accepted: 08/18/2021] [Indexed: 11/09/2022]
Abstract
Bone is a complex natural material with a complex hierarchical multiscale organization, crucial to perform its functions. Ultrastructural analysis of bone is crucial for our understanding of cell to cell communication, the healthy or pathological composition of bone tissue, and its three‐dimensional (3D) organization. A variety of techniques has been used to analyze bone tissue. This article describes a combined approach of optical, scanning electron, and transmission electron microscopy for the ultrastructural analysis of bone from the nanoscale to the macroscale, as illustrated by two pathological bone tissues. By following a top‐down approach to investigate the multiscale organization of pathological bones, quantitative estimates were made in terms of calcium content, nearest neighbor distances of osteocytes, canaliculi diameter, ordering, and D‐spacing of the collagen fibrils, and the orientation of intrafibrillar minerals which enable us to observe the fine structural details. We identify and discuss a series of two‐dimensional (2D) and 3D imaging techniques that can be used to characterize bone tissue. By doing so we demonstrate that, while 2D imaging techniques provide comparable information from pathological bone tissues, significantly different structural details are observed upon analyzing the pathological bone tissues in 3D. Finally, particular attention is paid to sample preparation for and quantitative processing of data from electron microscopic analysis.
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Affiliation(s)
- E Deniz Eren
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Wouter H Nijhuis
- Department of Orthopedic Surgery, University Medical Centre Utrecht, Wilhelmina Children's Hospital, Utrecht, The Netherlands
| | - Freek van der Weel
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Aysegul Dede Eren
- Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, The Netherlands.,Eindhoven University of Technology, Department of Biomedical Engineering, Biointerface Science, Eindhoven, The Netherlands
| | - Sana Ansari
- Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, The Netherlands.,Orthopedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Paul H H Bomans
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Heiner Friedrich
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands.,Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Ralph J Sakkers
- Department of Orthopedic Surgery, University Medical Centre Utrecht, Wilhelmina Children's Hospital, Utrecht, The Netherlands
| | - Harrie Weinans
- Department of Orthopedic Surgery, University Medical Centre Utrecht, Wilhelmina Children's Hospital, Utrecht, The Netherlands.,TU Delft, Department of Biomechanical Engineering, Delft, The Netherlands
| | - Gijsbertus de With
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
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18
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Tumor collagen framework from bright-field histology images predicts overall survival of breast carcinoma patients. Sci Rep 2021; 11:15474. [PMID: 34326378 PMCID: PMC8322324 DOI: 10.1038/s41598-021-94862-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 07/18/2021] [Indexed: 11/08/2022] Open
Abstract
Within the tumor microenvironment, specifically aligned collagen has been shown to stimulate tumor progression by directing the migration of metastatic cells along its structural framework. Tumor-associated collagen signatures (TACS) have been linked to breast cancer patient outcome. Robust and affordable methods for assessing biological information contained in collagen architecture need to be developed. We have developed a novel artificial neural network (ANN) based approach for tumor collagen segmentation from bright-field histology images and have tested it on a set of tissue microarray sections from early hormone receptor-positive invasive ductal breast carcinoma stained with Sirius Red (1 core per patient, n = 92). We designed and trained ANNs on sets of differently annotated image patches to segment collagen fibers and extracted 37 features of collagen fiber morphometry, density, orientation, texture, and fractal characteristics in the entire cohort. Independent instances of ANN models trained on highly differing annotations produced reasonably concordant collagen segmentation masks and allowed reliable prognostic Cox regression models (with likelihood ratios 14.11-22.99, at p-value < 0.05) superior to conventional clinical parameters (size of the primary tumor (T), regional lymph node status (N), histological grade (G), and patient age). Additionally, we noted statistically significant differences of collagen features between tumor grade groups, and the factor analysis revealed features resembling the TACS concept. Our proposed method offers collagen framework segmentation from bright-field histology images and provides novel image-based features for better breast cancer patient prognostication.
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19
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Song Q, Iku S, Sammons R, Yagami K, Furusawa T, Morimoto K, Rahaman MS, Kurasaki M, Tokura S, Kuboki Y. Binding of collagen gene products with titanium oxide. J Biochem 2021; 169:565-573. [PMID: 33630058 PMCID: PMC8254516 DOI: 10.1093/jb/mvaa146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 12/03/2020] [Indexed: 12/21/2022] Open
Abstract
Titanium is the only metal to which osteoblasts can adhere and on which they can grow and form bone tissue in vivo, resulting in a strong bond between the implant and living bone. This discovery provides the basis for the universal medical application of Ti. However, the biochemical mechanism of bond formation is still unknown. We aimed to elucidate the mechanism of bond formation between collagen, which constitutes the main organic component of bone, and TiO2, of which the entire surface of pure Ti is composed. We analysed the binding between the soluble collagen and TiO2 by chromatography with a column packed with Ti beads of 45 µm, and we explored the association between collagen fibrils and TiO2 (anatase) powders of 0.2 µm. We ran the column of chromatography under various elution conditions. We demonstrated that there is a unique binding affinity between Ti and collagen. This binding capacity was not changed even in the presence of the dissociative solvent 2M urea, but it decreased after heat denaturation of collagen, suggesting the contribution of the triple-helical structure. We propose a possible role of periodically occurring polar amino acids and the collagen molecules in the binding with TiO2.
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Affiliation(s)
- Qin Song
- College of Pharmacy and Bioengineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Shouhei Iku
- Suqian Yimei Technology Co., Biotechnology Industrial Park No. 1, Suqian, Jiangsu 223800, China.,Jiangsu Alphay Biological Technology Co., Ltd, 226009 Nantong, China
| | - Rachel Sammons
- Department of Biomaterials, School of Dentistry, Birmingham University, Birmingham, UK
| | - Kimitoshi Yagami
- Department of Oral Health Promotion, Graduate School of Oral Medicine, Matsumoto Dental University, Shiojiri 399-0781, Japan
| | - Toshitake Furusawa
- Department of Bioengineering, Graduate School of Science and Engineering, Yamagata University, Tsuruoka 982-0001, Japan
| | - Koichi Morimoto
- Department of Genetic Engineering, Kindai University, Kinokawa, Wakayama, Japan
| | - Md Shiblur Rahaman
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Masaaki Kurasaki
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Seiichi Tokura
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yoshinori Kuboki
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
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20
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Coulter FB, Levey RE, Robinson ST, Dolan EB, Deotti S, Monaghan M, Dockery P, Coulter BS, Burke LP, Lowery AJ, Beatty R, Paetzold R, Prendergast JJ, Bellavia G, Straino S, Cianfarani F, Salamone M, Bruno CM, Moerman KM, Ghersi G, Duffy GP, O'Cearbhaill ED. Additive Manufacturing of Multi-Scale Porous Soft Tissue Implants That Encourage Vascularization and Tissue Ingrowth. Adv Healthc Mater 2021; 10:e2100229. [PMID: 34165264 DOI: 10.1002/adhm.202100229] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 05/10/2021] [Indexed: 12/14/2022]
Abstract
Medical devices, such as silicone-based prostheses designed for soft tissue implantation, often induce a suboptimal foreign-body response which results in a hardened avascular fibrotic capsule around the device, often leading to patient discomfort or implant failure. Here, it is proposed that additive manufacturing techniques can be used to deposit durable coatings with multiscale porosity on soft tissue implant surfaces to promote optimal tissue integration. Specifically, the "liquid rope coil effect", is exploited via direct ink writing, to create a controlled macro open-pore architecture, including over highly curved surfaces, while adapting atomizing spray deposition of a silicone ink to create a microporous texture. The potential to tailor the degree of tissue integration and vascularization using these fabrication techniques is demonstrated through subdermal and submuscular implantation studies in rodent and porcine models respectively, illustrating the implant coating's potential applications in both traditional soft tissue prosthetics and active drug-eluting devices.
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Affiliation(s)
- Fergal B. Coulter
- UCD Centre for Biomedical Engineering School of Mechanical and Materials Engineering University College Dublin Dublin D04 V1W8 Ireland
| | - Ruth E. Levey
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
| | - Scott T. Robinson
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
- Advanced Materials and BioEngineering Research Centre (AMBER) Trinity College Dublin Dublin D02 E161 Ireland
| | - Eimear B. Dolan
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
- Biomedical Engineering College of Science and Engineering National University of Ireland Galway Galway H91 TK33 Ireland
| | - Stefano Deotti
- UCD Centre for Biomedical Engineering School of Mechanical and Materials Engineering University College Dublin Dublin D04 V1W8 Ireland
| | - Michael Monaghan
- Department of Mechanical and Manufacturing Engineering Trinity College Dublin The University of Dublin Dublin D02 PN40 Ireland
| | - Peter Dockery
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
| | - Brian S. Coulter
- Soils and Analytical Services Department Teagasc, Johnstown Castle Research Centre Wexford Y35 FN73 Ireland
| | - Liam P. Burke
- Discipline of Bacteriology School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
| | - Aoife J. Lowery
- Discipline of Surgery The Lambe Institute National University of Ireland Galway Galway H91 TK33 Ireland
| | - Rachel Beatty
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
| | - Ryan Paetzold
- UCD Centre for Biomedical Engineering School of Mechanical and Materials Engineering University College Dublin Dublin D04 V1W8 Ireland
| | - James J. Prendergast
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
| | | | | | | | | | | | - Kevin M. Moerman
- Department of Mechanical and Manufacturing Engineering Trinity College Dublin The University of Dublin Dublin D02 PN40 Ireland
- Media Lab Massachusetts Institute of Technology Cambridge Massachusetts MA 02139‐4307 USA
| | - Giulio Ghersi
- ABIEL srl viale delle Scienze ed.16 Palermo 90128 Italy
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche Università degli Studi di Palermo Palermo 90133 Italy
| | - Garry P. Duffy
- Discipline of Anatomy School of Medicine National University of Ireland Galway Galway H91 TK33 Ireland
- Advanced Materials and BioEngineering Research Centre (AMBER) Trinity College Dublin Dublin D02 E161 Ireland
- Regenerative Medicine Institute School of Medicine College of Medicine Nursing and Health Sciences National University of Ireland Galway Galway H91 TK33 Ireland
| | - Eoin D. O'Cearbhaill
- UCD Centre for Biomedical Engineering School of Mechanical and Materials Engineering University College Dublin Dublin D04 V1W8 Ireland
- UCD Conway Institute University College Dublin Dublin D04 V1W8 Ireland
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21
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Kelly M, Schroeder L, Mullendore DL, Dattilo BF, Peters WS. Feeding behaviour and the operculum in Olividae (Gastropoda): the case of Callianax biplicata (G. B. Sowerby I, 1825). FOLIA MALACOLOGICA 2021. [DOI: 10.12657/folmal.029.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Olividae are marine gastropods living as predators or scavengers on soft sediments. The complex prey handling behaviour of large predatory species includes the storage of food in a pouch formed temporarily by bending and contraction of the posterior foot. Such metapodial pouches had been observed only in Olividae that lack an operculum, prompting the hypothesis that the folding of the metapodium into a pouch biomechanically required the absence of the operculum. Here we report metapodial pouch formation in an operculate olivid, Callianax biplicata (formerly Olivella biplicata). Since the operculum is too small to close the shell aperture in mature C. biplicata, a protective function seems unlikely. The operculum may rather serve as an exoskeletal point for muscle attachment, but may also represent a ‘vestigial organ’ in the process of evolutionary reduction, or an ontogenetic remnant functional at early life stages but not at maturity. Consequently, our observations refute the notion that only inoperculate olivids can form pouches, but not necessarily the idea that the ability to form a metapodial pouch evolved in parallel with operculum reduction
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22
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Liu J, Xu MY, Wu J, Zhang H, Yang L, Lun DX, Hu YC, Liu B. Picrosirius-Polarization Method for Collagen Fiber Detection in Tendons: A Mini-Review. Orthop Surg 2021; 13:701-707. [PMID: 33689233 PMCID: PMC8126917 DOI: 10.1111/os.12627] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 01/14/2020] [Accepted: 01/14/2020] [Indexed: 12/31/2022] Open
Abstract
Although the structure and composition of collagen have been studied by polarized light microscopy since the early 19th century, many studies and reviews have paid little or no attention to the morphological problems of histopathological diagnosis. The morphology of collagen fibers is critical in guiding mechanical and biological properties in both normal and pathological tendons. Highlighting the organization and spatial distribution of tendon‐containing collagen fibers can be very useful for visualizing a tendon's ultrastructure, biochemical and indirect mechanical properties, which benefits other researchers and clinicians. Picrosirius red (PSR) staining, relying on the birefringence of collagen fibers, is one of the best understood histochemical methods that can highly and specifically underline fibers better than other common staining techniques when combined with polarized light microscopy (PLM). Polarized light microscopy provides complementary information about collagen fibers, such as orientation, type and spatial distribution, which is important for a comprehensive assessment of collagen alteration in a tendon. Here, this brief review serves as a simplistic and important primer to research developments in which differential staining of collagen types by the Picrosirius‐polarization method is increasing in diverse studies of the medical field, mainly in the assessment of the morphology, spatial distribution, and content of collagen in tendons.
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Affiliation(s)
- Jie Liu
- Tianjin Medical University, Tianjin, China
| | | | - Jing Wu
- Center for Medical Device Evaluation NMPA, Beijing, China
| | | | - Li Yang
- Tianjin Hospital, Tianjin, China
| | | | | | - Bin Liu
- Center for Medical Device Evaluation NMPA, Beijing, China
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23
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Rath PP, Yiu CKY, Matinlinna JP, Kishen A, Neelakantan P. The effects of sequential and continuous chelation on dentin. Dent Mater 2020; 36:1655-1665. [PMID: 33162115 DOI: 10.1016/j.dental.2020.10.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/26/2020] [Accepted: 10/14/2020] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Proteolytic and demineralizing agents have a profound influence on the dentin ultrastructure, which plays a key role in the mechanical integrity of the tooth and integrity of dentin-biomaterial interfaces. In-depth characterization of dentin treated with a novel root canal irrigation protocol comprising sodium hypochlorite (NaOCl) and etidronate (HEDP) is lacking. This study comprehensively characterized and compared the effects of the continuous chelation (NaOCl/HEDP) and sequential chelation (NaOCl/EDTA) protocols on dentin. METHODS Dentin blocks, dentin powder and root canals of mandibular premolars were distributed into Group 1, Saline (control); Group 2, NaOCl/EDTA; and Group 3, NaOCl/HEDP. Ultrastructural characteristics of the treated dentin were investigated using electron microscopy and light microscopy, while the surface roughness was analyzed using atomic force microscopy. Chemical compositional changes were characterized using Fourier transform infrared spectroscopy (FTIR) and energy-dispersive-X-ray spectroscopy (EDS), while collagen degradation was determined using ninhydrin assay. Data were statistically analyzed using multiple-factor one-way ANOVA and Tukey HSD tests (P = 0.05). RESULTS NaOCl/HEDP resulted in partially degraded, yet mineralized collagen fibers, with minimal alteration to the subsurface matrix. Conversely, NaOCl/EDTA dissolved the hydroxyapaptite encapsulation, exposing collagen fibre bundles. There was no significant difference in the surface roughness between the two protocols (P > 0.05). NaOCl/HEDP resulted in homogenous distribution of organic and inorganic components on the treated surface. SIGNIFICANCE This study highlighted that continuous chelation (NaOCl/HEDP) resulted in a frail surface collagen layer while sequential chelation (NaOCl/EDTA) exposed bare collagen fibres. These surface and sub-surface effects potentially contribute to structural failures of dentin and/or dentin-biomaterial interfacial failures.
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Affiliation(s)
- Priti P Rath
- Discipline of Endodontology, Department of Restorative Dental Sciences, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Cynthia K Y Yiu
- Discipline of Pediatric Dentistry, Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Jukka P Matinlinna
- Dental Materials Science, Department of Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Anil Kishen
- Faculty of Dentistry, The University of Toronto, Dentistry; Mount Sinai Hospital, Toronto, ON, Canada
| | - Prasanna Neelakantan
- Discipline of Endodontology, Department of Restorative Dental Sciences, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region.
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Gräfe MGO, van de Kreeke JA, Willemse J, Braaf B, de Jong Y, Tan HS, Verbraak FD, de Boer JF. Subretinal Fibrosis Detection Using Polarization Sensitive Optical Coherence Tomography. Transl Vis Sci Technol 2020; 9:13. [PMID: 32818100 PMCID: PMC7396173 DOI: 10.1167/tvst.9.4.13] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 12/16/2019] [Indexed: 12/22/2022] Open
Abstract
Purpose Subretinal fibrosis (SRFib) is an important cause of permanent loss-of-vision diseases with submacular neovascularization, but a reliable diagnostic method is currently missing. This study uses polarization-sensitive optical coherence tomography (PS-OCT) to detect SRFib within retinal lesions by measurement of its birefringent collagen fibers. Methods Twenty-five patients were enrolled with retinal pathology in one or both eyes containing (1) suspected SRFib, (2) lesions suspected not to be fibrotic, or (3) lesions with doubtful presence of SRFib. All eyes were evaluated for SRFIb using conventional diagnostics by three retinal specialists. PS-OCT images were visually evaluated for SRFib based on cumulative phase retardation, local birefringence, and optic axis uniformity. Results Twenty-nine eyes from 22 patients were scanned successfully. In 13 eyes, SRFib was diagnosed by all retinal specialists; of these, 12 were confirmed by PS-OCT and one was inconclusive. In nine eyes, the retinal specialists expected no SRFib, which was confirmed by PS-OCT in all cases. In seven eyes, the retinal specialists’ evaluations were inconsistent with regard to the presence of SRFib. PS-OCT confirmed the presence of SRFib in four of these eyes and the absence of SRFib in two eyes and was inconclusive in one eye. Conclusions In 21 out of 22 eyes, PS-OCT confirmed the evaluation of retinal specialists regarding the presence of SRFib. PS-OCT provided additional information to distinguish SRFib from other tissues within subretinal neovascular lesions in 6 out of 7 eyes. Translational Relevance PS-OCT can identify and quantify SRFib in doubtful cases for which a reliable diagnosis is currently lacking.
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Affiliation(s)
- Maximilian G O Gräfe
- LaserLaB Amsterdam, Department of Physics and Astronomy, Vrije Universiteit, Amsterdam, The Netherlands
| | | | - Joy Willemse
- LaserLaB Amsterdam, Department of Physics and Astronomy, Vrije Universiteit, Amsterdam, The Netherlands
| | - Boy Braaf
- LaserLaB Amsterdam, Department of Physics and Astronomy, Vrije Universiteit, Amsterdam, The Netherlands
| | - Yvonne de Jong
- Department of Ophthalmology, Amsterdam UMC, Amsterdam, The Netherlands
| | - H Stevie Tan
- Department of Ophthalmology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Frank D Verbraak
- Department of Ophthalmology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Johannes F de Boer
- LaserLaB Amsterdam, Department of Physics and Astronomy, Vrije Universiteit, Amsterdam, The Netherlands.,Department of Ophthalmology, Amsterdam UMC, Amsterdam, The Netherlands
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25
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Ferreira TPT, Lima JGME, Farias-Filho FA, Jannini de Sá YAP, de Arantes ACS, Guimarães FV, Carvalho VDF, Hogaboam C, Wallace J, Martins MA, Silva PMRE. Intranasal Flunisolide Suppresses Pathological Alterations Caused by Silica Particles in the Lungs of Mice. Front Endocrinol (Lausanne) 2020; 11:388. [PMID: 32625168 PMCID: PMC7311565 DOI: 10.3389/fendo.2020.00388] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 05/15/2020] [Indexed: 12/19/2022] Open
Abstract
Silicosis is an occupational disease triggered by the inhalation of fine particles of crystalline silica and characterized by inflammation and scarring in the form of nodular lesions in the lungs. In spite of the therapeutic arsenal currently available, there is no specific treatment for the disease. Flunisolide is a potent corticosteroid shown to be effective for controlling chronic lung inflammatory diseases. In this study, the effect of flunisolide on silica-induced lung pathological changes in mice was investigated. Swiss-Webster mice were injected intranasally with silica particles and further treated with flunisolide from day 21 to 27 post-silica challenge. Lung function was assessed by whole body invasive plethysmography. Granuloma formation was evaluated morphometrically, collagen deposition by Picrus sirius staining and quantitated by Sircol. Chemokines and cytokines were evaluated using enzyme-linked immunosorbent assay. The sensitivity of lung fibroblasts was also examined in in vitro assays. Silica challenge led to increased leukocyte numbers (mononuclear cells and neutrophils) as well as production of the chemokine KC/CXCL-1 and the cytokines TNF-α and TGF-β in the bronchoalveolar lavage. These alterations paralleled to progressive granuloma formation, collagen deposition and impairment of lung function. Therapeutic administration of intranasal flunisolide inhibited granuloma and fibrotic responses, noted 28 days after silica challenge. The upregulation of MIP-1α/CCL-3 and MIP-2/CXCL-2 and the cytokines TNF-α and TGF-β, as well as deposition of collagen and airway hyper-reactivity to methacholine were shown to be clearly sensitive to flunisolide, as compared to silica-challenge untreated mice. Additionally, flunisolide effectively suppressed the responses of proliferation and MCP-1/CCL-2 production from IL-13 stimulated lung fibroblasts from silica- or saline-challenged mice. In conclusion, we report that intranasal treatment with the corticosteroid flunisolide showed protective properties on pathological features triggered by silica particles in mice, suggesting that the compound may constitute a promising strategy for the treatment of silicosis.
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Affiliation(s)
| | | | | | | | | | | | | | - Cory Hogaboam
- Department of Medicine, Cedars-Sinai Medical Center, Women's Guild Lung Institute, Los Angeles, CA, United States
| | - John Wallace
- Departments of Physiology and Pharmacology, and Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Marco Aurélio Martins
- Laboratory of Inflammation, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Patrícia Machado Rodrigues e Silva
- Laboratory of Inflammation, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- *Correspondence: Patrícia Machado Rodrigues e Silva
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26
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Rieppo L, Janssen L, Rahunen K, Lehenkari P, Finnilä MAJ, Saarakkala S. Histochemical quantification of collagen content in articular cartilage. PLoS One 2019; 14:e0224839. [PMID: 31697756 PMCID: PMC6837441 DOI: 10.1371/journal.pone.0224839] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 10/22/2019] [Indexed: 11/18/2022] Open
Abstract
Background Articular cartilage (AC) is mainly composed of water, type II collagen, proteoglycans (PGs) and chondrocytes. The amount of PGs in AC is routinely quantified with digital densitometry (DD) from Safranin O-stained sections, but it is unclear whether similar method could be used for collagens. Objective The aim of this study was to clarify whether collagens can be quantified from histological AC sections using DD. Material and methods Sixteen human AC samples were stained with Masson’s trichrome or Picrosirius red. Optical densities of histological stains were compared to two commonly used collagen parameters (amide I and collagen CH2 side chain peak at 1338cm-1) measured using Fourier Transform Infrared (FTIR) spectroscopic imaging. Results Optical density of Modified Masson’s trichrome staining, which included enzymatic removal of PGs before staining, correlated significantly with FTIR-derived collagen parameters at almost all depths of cartilage. The other studied staining protocols displayed significant correlations with the reference parameters at only few depth layers. Conclusions Based on our findings, modified Masson’s trichrome staining protocol is suitable for quantification of AC collagen content. Enzymatic removal of PGs prior to staining is critical as us allows better staining of the collagen. Further optimization of staining protocols may improve the results in the future studies.
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Affiliation(s)
- Lassi Rieppo
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland
- * E-mail:
| | - Lauriane Janssen
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland
- Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
| | - Krista Rahunen
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland
| | - Petri Lehenkari
- Department of Surgery and Intensive Care, Oulu University Hospital, Oulu, Finland
- Cancer and Translational Medicine Research Unit, Faculty of Medicine, University of Oulu, Oulu, Finland
| | - Mikko A. J. Finnilä
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland
| | - Simo Saarakkala
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland
- Infotech Oulu, University of Oulu, Oulu, Finland
- Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
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27
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Miyazawa A, Makita S, Li E, Yamazaki K, Kobayashi M, Sakai S, Yasuno Y. Polarization-sensitive optical coherence elastography. BIOMEDICAL OPTICS EXPRESS 2019; 10:5162-5181. [PMID: 31646039 PMCID: PMC6788587 DOI: 10.1364/boe.10.005162] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 09/09/2019] [Accepted: 09/11/2019] [Indexed: 05/05/2023]
Abstract
Polarization-sensitive optical coherence elastography (PS-OCE) is developed for improved tissue discrimination. It integrates Jones matrix-based PS-optical coherence tomography (PS-OCT) with compression OCE. The method simultaneously measures the OCT intensity, attenuation coefficient, birefringence, and microstructural deformation (MSD) induced by tissue compression. Ex vivo porcine aorta and esophagus tissues were investigated by PS-OCE and histological imaging. The tissue properties measured by PS-OCE are shown as cross-sectional images and a three-dimensional (3-D) depth-trajectory plot. In this trajectory plot, the average attenuation coefficient, birefringence, and MSD were computed at each depth, and the trajectory in the depth direction was plotted in a 3-D feature space of these three properties. The tissue boundaries in a histological image corresponded with the depth-trajectory inflection points. Histogram analysis and t-distributed stochastic neighbour embedding (t-SNE) visualization of the three tissue properties indicated that the PS-OCE measurements provide sufficient information to discriminate porcine esophagus tissues.
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Affiliation(s)
- Arata Miyazawa
- Computational Optics Group, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8573, Japan
| | - Shuichi Makita
- Computational Optics Group, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8573, Japan
| | - En Li
- Computational Optics Group, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8573, Japan
| | - Kohei Yamazaki
- Biological Science Research, Kao Corporation, 5-3-28, Kotobukicho, Odawara, Kanagawa, 250-0002, Japan
| | - Masaki Kobayashi
- Biological Science Research, Kao Corporation, 5-3-28, Kotobukicho, Odawara, Kanagawa, 250-0002, Japan
| | - Shingo Sakai
- Skin Care Product Research, Kao Corporation, 5-3-28, Kotobukicho, Odawara, Kanagawa, 250-0002, Japan
| | - Yoshiaki Yasuno
- Computational Optics Group, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8573, Japan
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Kohn JC, Bordeleau F, Miller J, Watkins HC, Modi S, Ma J, Azar J, Putnam D, Reinhart-King CA. Beneficial Effects of Exercise on Subendothelial Matrix Stiffness are Short-Lived. J Biomech Eng 2019; 140:2675127. [PMID: 29560498 DOI: 10.1115/1.4039579] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Indexed: 11/08/2022]
Abstract
Aerobic exercise helps to maintain cardiovascular health in part by mitigating age-induced arterial stiffening. However, the long-term effects of exercise regimens on aortic stiffness remain unknown, especially in the intimal extracellular matrix layer known as the subendothelial matrix. To examine how the stiffness of the subendothelial matrix changes following exercise cessation, mice were exposed to an 8 week swimming regimen followed by an 8 week sedentary rest period. Whole vessel and subendothelial matrix stiffness were measured after both the exercise and rest periods. After swimming, whole vessel and subendothelial matrix stiffness decreased, and after 8 weeks of rest, these values returned to baseline. Within the same time frame, the collagen content in the intima layer and the presence of advanced glycation end products (AGEs) in the whole vessel were also affected by the exercise and the rest periods. Overall, our data indicate that consistent exercise is necessary for maintaining compliance in the subendothelial matrix.
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Affiliation(s)
- Julie C Kohn
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853 e-mail:
| | - François Bordeleau
- Department of Biomedical Engineering, Vanderbilt University, Engineering and Science Building, Nashville, TN 351631 e-mail:
| | - Joseph Miller
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853 e-mail:
| | - Hannah C Watkins
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853 e-mail:
| | - Shweta Modi
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853 e-mail:
| | - Jenny Ma
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853 e-mail:
| | - Julian Azar
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853 e-mail:
| | - David Putnam
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853.,Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, , Ithaca, NY 14853 e-mail:
| | - Cynthia A Reinhart-King
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY 14853.,Cornelius Vanderbilt Professor of Engineering, Department of Biomedical Engineering, Vanderbilt University, Mailbox PMB 351631, 440 Engineering and Science Building, Nashville, TN 351631 e-mails:
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29
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Yaksh TL, Eddinger KA, Kokubu S, Wang Z, DiNardo A, Ramachandran R, Zhu Y, He Y, Weren F, Quang D, Malkmus SA, Lansu K, Kroeze WK, Eliceiri B, Steinauer JJ, Schiller PW, Gmeiner P, Page LM, Hildebrand KR. Mast Cell Degranulation and Fibroblast Activation in the Morphine-induced Spinal Mass: Role of Mas-related G Protein-coupled Receptor Signaling. Anesthesiology 2019; 131:132-147. [PMID: 31225809 PMCID: PMC6590697 DOI: 10.1097/aln.0000000000002730] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND As the meningeally derived, fibroblast-rich, mass-produced by intrathecal morphine infusion is not produced by all opiates, but reduced by mast cell stabilizers, the authors hypothesized a role for meningeal mast cell/fibroblast activation. Using the guinea pig, the authors asked: (1) Are intrathecal morphine masses blocked by opiate antagonism?; (2) Do opioid agonists not producing mast cell degranulation or fibroblast activation produce masses?; and (3) Do masses covary with Mas-related G protein-coupled receptor signaling thought to mediate mast cell degranulation? METHODS In adult male guinea pigs (N = 66), lumbar intrathecal catheters connected to osmotic minipumps (14 days; 0.5 µl/h) were placed to deliver saline or equianalgesic concentrations of morphine sulfate (33 nmol/h), 2',6'-dimethyl tyrosine-(Tyr-D-Arg-Phe-Lys-NH2) (abbreviated as DMT-DALDA; 10 pmol/h; μ agonist) or PZM21 (27 nmol/h; biased μ agonist). A second pump delivered subcutaneous naltrexone (25 µg/h) in some animals. After 14 to 16 days, animals were anesthetized and perfusion-fixed. Drug effects on degranulation of human cultured mast cells, mouse embryonic fibroblast activation/migration/collagen formation, and Mas-related G protein-coupled receptor activation (PRESTO-Tango assays) were determined. RESULTS Intrathecal infusion of morphine, DMT-DALDA or PZM21, but not saline, comparably increased thermal thresholds for 7 days. Spinal masses proximal to catheter tip, composed of fibroblast/collagen type I (median: interquartile range, 0 to 4 scale), were produced by morphine (2.3: 2.0 to 3.5) and morphine plus naltrexone (2.5: 1.4 to 3.1), but not vehicle (1.2: 1.1 to 1.5), DMT-DALDA (1.0: 0.6 to 1.3), or PZM21 (0.5: 0.4 to 0.8). Morphine in a naloxone-insensitive fashion, but not PZM21 or DMT-DALDA, resulted in mast cell degranulation and fibroblast proliferation/collagen formation. Morphine-induced fibroblast proliferation, as mast cell degranulation, is blocked by cromolyn. Mas-related G protein-coupled receptor activation was produced by morphine and TAN67 (∂-opioid agonist), but not by PZM21, TRV130 (mu biased ligand), or DMT-DALDA. CONCLUSIONS Opiates that activate Mas-related G protein-coupled receptor will degranulate mast cells, activate fibroblasts, and result in intrathecal mass formation. Results suggest a mechanistically rational path forward to safer intrathecal opioid therapeutics.
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Affiliation(s)
- Tony L Yaksh
- From the Laboratory of Anesthesiology Research, Department of Anesthesiology (T.L.Y., K.A.E., S.K., R.R., Y.Z., Y.H., F.W., D.Q., S.A.M., J.J.S.) Department of Dermatology (Z.W., A.D.) Division of Trauma, Department of Surgery (B.P.E.), University of California, San Diego, California the Department of Pharmacology, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina (K.L., W.K.K) Montreal Clinical Research Institute and the Department of Pharmacology and Physiology, University of Montreal, Quebec, Canada (P.W.S.) Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nurnberg, Erlangen, Germany (P.G.) Implantables Research and Technology, Medtronic, Inc., Restorative Therapies Group, Minneapolis, Minnesota (L.M.P., K.R.H.)
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Abstract
Biofabrication techniques have enabled the formation of complex models of many biological tissues. We present a framework to contextualize biofabrication techniques within a disease modeling application. Fibrosis is a progressive disease interfering with tissue structure and function, which stems from an aberrant wound healing response. Epithelial injury and clot formation lead to fibroblast invasion and activation, followed by contraction and remodeling of the extracellular matrix. These stages have healthy wound healing variants in addition to the pathogenic analogs that are seen in fibrosis. This review evaluates biofabrication of a variety of phenotypic cell-based fibrosis assays. By recapitulating different contributors to fibrosis, these assays are able to evaluate biochemical pathways and therapeutic candidates for specific stages of fibrosis pathogenesis. Biofabrication of these culture models may enable phenotypic screening for improved understanding of fibrosis biology as well as improved screening of anti-fibrotic therapeutics.
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Affiliation(s)
- Cameron Yamanishi
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory School of Medicine, Atlanta, United States of America
- The Parker H Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, United States of America
| | - Stephen Robinson
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory School of Medicine, Atlanta, United States of America
- The Parker H Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, United States of America
| | - Shuichi Takayama
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory School of Medicine, Atlanta, United States of America
- The Parker H Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, United States of America
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31
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Hariri LP, Adams DC, Applegate MB, Miller AJ, Roop BW, Villiger M, Bouma BE, Suter MJ. Distinguishing Tumor from Associated Fibrosis to Increase Diagnostic Biopsy Yield with Polarization-Sensitive Optical Coherence Tomography. Clin Cancer Res 2019; 25:5242-5249. [PMID: 31175092 DOI: 10.1158/1078-0432.ccr-19-0566] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/09/2019] [Accepted: 06/03/2019] [Indexed: 12/20/2022]
Abstract
PURPOSE With recent advancements in personalized medicine, biopsies must contain sufficient tumor for histologic diagnosis and molecular testing. However, inadvertent biopsy of tumor-associated fibrosis compromises tumor yield, resulting in delayed diagnoses and/or repeat procedures when additional tumor is needed. The ability to differentiate tumor from fibrosis intraprocedurally during biopsy could significantly increase tumor yield. Polarization-sensitive optical coherence tomography (PS-OCT) is an imaging modality that is endoscope- and/or needle-compatible, and provides large volumetric views of tissue microstructure with high resolution (∼10 μm) while simultaneously measuring birefringence of organized tissues such as collagen. We aim to determine whether PS-OCT can accurately detect and distinguish tumor-associated fibrosis from tumor. EXPERIMENTAL DESIGN PS-OCT was obtained ex vivo in 64 lung nodule samples. PS-OCT birefringence was measured and correlated to collagen content in precisely matched histology, quantified on picrosirius red (PSR) staining. RESULTS There was a strong positive correlation between PS-OCT measurement of birefringent fibrosis and total collagen content by PSR (r = 0.793; P < 0.001). In addition, PS-OCT was able to accurately classify tumor regions with >20% fibrosis from those with low fibrosis (≤20%) that would likely yield higher tumor content (P < 0.0001). CONCLUSIONS PS-OCT enables accurate fibrosis detection and can distinguish tumor regions with low fibrosis. PS-OCT has significant potential for clinical impact, as the ability to differentiate tumor from fibrosis could be used to guide intraprocedural tissue sampling in vivo, or for rapid biopsy adequacy assessment ex vivo, to increase diagnostic tumor yield essential for patient care and research.
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Affiliation(s)
- Lida P Hariri
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts. .,Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - David C Adams
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Matthew B Applegate
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Alyssa J Miller
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Benjamin W Roop
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Martin Villiger
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Brett E Bouma
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Melissa J Suter
- Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Boston, Massachusetts. .,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
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32
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New insight into the determination of amylose content for maize starches through digital image analysis. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2018.05.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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33
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Ferrand P, Baroni A, Allain M, Chamard V. Quantitative imaging of anisotropic material properties with vectorial ptychography. OPTICS LETTERS 2018; 43:763-766. [PMID: 29443988 DOI: 10.1364/ol.43.000763] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 12/26/2017] [Indexed: 05/24/2023]
Abstract
Following the recent establishment of the formalism of vectorial ptychography [Opt. Lett.40, 5144 (2015)OPLEDP0146-959210.1364/OL.40.005144], first measurements, to the best of our knowledge, are reported in the optical range, demonstrating the capability of the proposed method to map the four parameters of the Jones matrix of an anisotropic specimen, and therefore to quantify a wide range of optical material properties, including power transmittance, optical path difference, diattenuation, retardance, and fast-axis orientation.
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34
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Georgiadis M, Müller R, Schneider P. Techniques to assess bone ultrastructure organization: orientation and arrangement of mineralized collagen fibrils. J R Soc Interface 2017; 13:rsif.2016.0088. [PMID: 27335222 DOI: 10.1098/rsif.2016.0088] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 05/18/2016] [Indexed: 12/13/2022] Open
Abstract
Bone's remarkable mechanical properties are a result of its hierarchical structure. The mineralized collagen fibrils, made up of collagen fibrils and crystal platelets, are bone's building blocks at an ultrastructural level. The organization of bone's ultrastructure with respect to the orientation and arrangement of mineralized collagen fibrils has been the matter of numerous studies based on a variety of imaging techniques in the past decades. These techniques either exploit physical principles, such as polarization, diffraction or scattering to examine bone ultrastructure orientation and arrangement, or directly image the fibrils at the sub-micrometre scale. They make use of diverse probes such as visible light, X-rays and electrons at different scales, from centimetres down to nanometres. They allow imaging of bone sections or surfaces in two dimensions or investigating bone tissue truly in three dimensions, in vivo or ex vivo, and sometimes in combination with in situ mechanical experiments. The purpose of this review is to summarize and discuss this broad range of imaging techniques and the different modalities of their use, in order to discuss their advantages and limitations for the assessment of bone ultrastructure organization with respect to the orientation and arrangement of mineralized collagen fibrils.
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Affiliation(s)
| | - Ralph Müller
- Institute for Biomechanics, ETH Zurich, Zurich, Switzerland
| | - Philipp Schneider
- Institute for Biomechanics, ETH Zurich, Zurich, Switzerland Bioengineering Science Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, UK
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Parkin JD, San Antonio JD, Persikov AV, Dagher H, Dalgleish R, Jensen ST, Jeunemaitre X, Savige J. The collαgen III fibril has a "flexi-rod" structure of flexible sequences interspersed with rigid bioactive domains including two with hemostatic roles. PLoS One 2017; 12:e0175582. [PMID: 28704418 PMCID: PMC5509119 DOI: 10.1371/journal.pone.0175582] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 03/20/2017] [Indexed: 01/18/2023] Open
Abstract
Collagen III is critical to the integrity of blood vessels and distensible organs, and in hemostasis. Examination of the human collagen III interactome reveals a nearly identical structural arrangement and charge distribution pattern as for collagen I, with cell interaction domains, fibrillogenesis and enzyme cleavage domains, several major ligand-binding regions, and intermolecular crosslink sites at the same sites. These similarities allow heterotypic fibril formation with, and substitution by, collagen I in embryonic development and wound healing. The collagen III fibril assumes a "flexi-rod" structure with flexible zones interspersed with rod-like domains, which is consistent with the molecule's prominence in young, pliable tissues and distensible organs. Collagen III has two major hemostasis domains, with binding motifs for von Willebrand factor, α2β1 integrin, platelet binding octapeptide and glycoprotein VI, consistent with the bleeding tendency observed with COL3A1 disease-causing sequence variants.
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Affiliation(s)
- J. Des Parkin
- From the University of Melbourne Department of Medicine (Northern Health), Melbourne, VIC, Australia
| | - James D. San Antonio
- Operations, Stryker Global Quality and Operations, Malvern, PA, United States of America
| | - Anton V. Persikov
- Lewis-Sigler Institute for Integrative Genomics, Princeton University, Carl Icahn Lab, Princeton, NJ, United States of America
| | - Hayat Dagher
- From the University of Melbourne Department of Medicine (Northern Health), Melbourne, VIC, Australia
| | - Raymond Dalgleish
- Department of Genetics, University of Leicester, Leicester, United Kingdom
| | - Shane T. Jensen
- Wharton Business School, University of Pennsylvania, Philadelphia, PA, United States of America
| | - Xavier Jeunemaitre
- INSERM U970 Paris Cardiovascular Research Centre, Paris France
- University Paris Descartes, Paris Sorbonne Cite, Paris, France
| | - Judy Savige
- From the University of Melbourne Department of Medicine (Northern Health), Melbourne, VIC, Australia
- * E-mail:
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Mredha MTI, Kitamura N, Nonoyama T, Wada S, Goto K, Zhang X, Nakajima T, Kurokawa T, Takagi Y, Yasuda K, Gong JP. Anisotropic tough double network hydrogel from fish collagen and its spontaneous in vivo bonding to bone. Biomaterials 2017; 132:85-95. [DOI: 10.1016/j.biomaterials.2017.04.005] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 03/31/2017] [Accepted: 04/03/2017] [Indexed: 11/25/2022]
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Monaghan MG, Holeiter M, Brauchle E, Layland SL, Lu Y, Deb A, Pandit A, Nsair A, Schenke-Layland K. Exogenous miR-29B Delivery Through a Hyaluronan-Based Injectable System Yields Functional Maintenance of the Infarcted Myocardium. Tissue Eng Part A 2017; 24:57-67. [PMID: 28463641 PMCID: PMC5770094 DOI: 10.1089/ten.tea.2016.0527] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Myocardial infarction (MI) results in debilitating remodeling of the myocardial extracellular matrix (ECM). In this proof-of-principle study it was sought to modulate this aggressive remodeling by injecting a hyaluronic acid-based reservoir delivering exogenous microRNA-29B (miR-29B). This proof-of-principal study was executed whereby myocardial ischemia/reperfusion was performed on C57BL/6 mice for 45 min after which five 10 μL boluses of a hydrogel composed of thiolated hyaluronic acid cross-linked with poly (ethylene glycol) diacrylate, containing exogenous miR-29B as an active therapy, were injected into the border zone of the infarcted myocardium. Following surgery, the myocardial function of the animals was monitored up to 5 weeks. Delivering miR-29B locally using an injectable hyaluronan-based hydrogel resulted in the maintenance of myocardial function at 2 and 5 weeks following MI in this proof-of-principle study. In addition, while animals treated with the control of a nontargeting miR delivered using the hyaluronan-based hydrogel had a significant deterioration of myocardial function, those treated with miR-29B did not. Histological analysis revealed a significantly decreased presence of elastin and significantly less immature/newly deposited collagen fibers at the border zone of the infarct. Increased vascularity of the myocardial scar was also detected and Raman microspectroscopy discovered significantly altered ECM-specific biochemical signals at the border zone of the infarct. This preclinical proof-of-principle study demonstrates that an injectable hyaluronic acid hydrogel system could be capable of delivering miR-29B toward maintaining cardiac function following MI. In addition, Raman microspectroscopy revealed subtle, yet significant changes in ECM organization and maturity. These findings have great potential with regard to using injectable biomaterials as a local treatment for ischemic tissue and exogenous miRs to modulate tissue remodeling.
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Affiliation(s)
- Michael G Monaghan
- 1 Department of Women's Health, Research Institute for Women's Health, Eberhard Karls University , Tübingen, Germany .,2 Department of Cell and Tissue Engineering, Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB) , Stuttgart, Germany .,3 Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, the University of Dublin , Dublin, Ireland
| | - Monika Holeiter
- 1 Department of Women's Health, Research Institute for Women's Health, Eberhard Karls University , Tübingen, Germany .,2 Department of Cell and Tissue Engineering, Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB) , Stuttgart, Germany
| | - Eva Brauchle
- 1 Department of Women's Health, Research Institute for Women's Health, Eberhard Karls University , Tübingen, Germany .,2 Department of Cell and Tissue Engineering, Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB) , Stuttgart, Germany
| | - Shannon L Layland
- 1 Department of Women's Health, Research Institute for Women's Health, Eberhard Karls University , Tübingen, Germany .,2 Department of Cell and Tissue Engineering, Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB) , Stuttgart, Germany
| | - Yan Lu
- 4 Department of Medicine/Cardiology, Cardiovascular Research Laboratories (CVRL), University of California (UCLA) , Los Angeles, California
| | - Arjun Deb
- 4 Department of Medicine/Cardiology, Cardiovascular Research Laboratories (CVRL), University of California (UCLA) , Los Angeles, California
| | - Abhay Pandit
- 5 Centre for Research in Medical Devices (CÚRAM), National University of Ireland , Galway, Ireland
| | - Ali Nsair
- 4 Department of Medicine/Cardiology, Cardiovascular Research Laboratories (CVRL), University of California (UCLA) , Los Angeles, California
| | - Katja Schenke-Layland
- 1 Department of Women's Health, Research Institute for Women's Health, Eberhard Karls University , Tübingen, Germany .,2 Department of Cell and Tissue Engineering, Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB) , Stuttgart, Germany .,4 Department of Medicine/Cardiology, Cardiovascular Research Laboratories (CVRL), University of California (UCLA) , Los Angeles, California
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Sarojini H, Billeter AT, Eichenberger S, Druen D, Barnett R, Gardner SA, Galbraith NJ, Polk HC, Chien S. Rapid tissue regeneration induced by intracellular ATP delivery-A preliminary mechanistic study. PLoS One 2017; 12:e0174899. [PMID: 28380006 PMCID: PMC5381896 DOI: 10.1371/journal.pone.0174899] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/16/2017] [Indexed: 02/06/2023] Open
Abstract
We have reported a new phenomenon in acute wound healing following the use of intracellular ATP delivery—extremely rapid tissue regeneration, which starts less than 24 h after surgery, and is accompanied by massive macrophage trafficking, in situ proliferation, and direct collagen production. This unusual process bypasses the formation of the traditional provisional extracellular matrix and significantly shortens the wound healing process. Although macrophages/monocytes are known to play a critical role in the initiation and progression of wound healing, their in situ proliferation and direct collagen production in wound healing have never been reported previously. We have explored these two very specific pathways during wound healing, while excluding confounding factors in the in vivo environment by analyzing wound samples and performing in vitro studies. The use of immunohistochemical studies enabled the detection of in situ macrophage proliferation in ATP-vesicle treated wounds. Primary human macrophages and Raw 264.7 cells were used for an in vitro study involving treatment with ATP vesicles, free Mg-ATP alone, lipid vesicles alone, Regranex, or culture medium. Collagen type 1α 1, MCP-1, IL-6, and IL-10 levels were determined by ELISA of the culture supernatant. The intracellular collagen type 1α1 localization was determined with immunocytochemistry. ATP-vesicle treated wounds showed high immunoreactivity towards BrdU and PCNA antigens, indicating in situ proliferation. Most of the cultured macrophages treated with ATP-vesicles maintained their classic phenotype and expressed high levels of collagen type 1α1 for a longer duration than was observed with cells treated with Regranex. These studies provide the first clear evidence of in situ macrophage proliferation and direct collagen production during wound healing. These findings provide part of the explanation for the extremely rapid tissue regeneration, and this treatment may hold promise for acute and chronic wound care.
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Affiliation(s)
- Harshini Sarojini
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Adrian T. Billeter
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Sarah Eichenberger
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Devin Druen
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Rebecca Barnett
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Sarah A. Gardner
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Norman J. Galbraith
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Hiram C. Polk
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Sufan Chien
- Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
- * E-mail:
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Liu P, Li C, Zheng N, Xu Q, Yu SB, Sui HJ. The myodural bridge existing in the Nephocaena phocaenoides. PLoS One 2017; 12:e0173630. [PMID: 28278181 PMCID: PMC5344499 DOI: 10.1371/journal.pone.0173630] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Accepted: 02/22/2017] [Indexed: 11/22/2022] Open
Abstract
Recent studies have identified that the myodural bridge (MDB) between the rectus capitis posterior minor (RCPmi) and the cervical spinal dura mater in the posterior atlanto-occipital interspace in humans. And it was supposed that the MDB may play essential physiological roles. As a result, the MDB is possibly a highly conserved structure in the evolution of mammals. However, there is little confirmative description about the existence of the MDB in marine mammals. The objective of this study was to explore the existence and the fiber property of the MDB in the Neophocaena phocaenoides. Six cadavers of the Neophocaena phocaenoides with formalin fixation were used in this study. One was used for head and neck CT scanning and three-dimensional (3D) reconstruction and suboccipital region dissection, two were for sectional observation by P45 plastinated sheets of head and neck, and three were for histological analysis of suboccipial structures. This is the first study to demonstrate the existence of the MDB in the aquatic mammals. The rectus capitis dorsal minor (RCDmi) originated from the inferior border of the occiput and inserted into the cervical spinal dura mater. At the ventral aspect of the RCDmi, the MDB directly extended through the posterior atlanto-occipital interspace and connected with the cervical spinal dura mater which was consisted of type Ⅰ collagen. In addition, the dorsal atlanto-occipital membrane was not found in the Neophocaena phocaenoides. The tendinous myodural bridge extended from the RCDmi to the spinal dura mater through the posterior atlanto-occipital interspace in the Neophocaena phocaenoides.
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Affiliation(s)
- Pei Liu
- The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Chan Li
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Nan Zheng
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian, China
| | - Qiang Xu
- Department of Radiology, The 403 Affiliated Hospital of Chinese PLA General Hospital, Dalian, China
| | - Sheng-Bo Yu
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian, China
- * E-mail: (HJS); (SBY)
| | - Hong-Jin Sui
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian, China
- Dalian Hoffen Preservation Institution, Dalian, China
- * E-mail: (HJS); (SBY)
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Georgiadis M, Guizar-Sicairos M, Gschwend O, Hangartner P, Bunk O, Müller R, Schneider P. Ultrastructure Organization of Human Trabeculae Assessed by 3D sSAXS and Relation to Bone Microarchitecture. PLoS One 2016; 11:e0159838. [PMID: 27547973 PMCID: PMC4993496 DOI: 10.1371/journal.pone.0159838] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Accepted: 07/08/2016] [Indexed: 01/27/2023] Open
Abstract
Although the organization of bone ultrastructure, i.e. the orientation and arrangement of the mineralized collagen fibrils, has been in the focus of research for many years for cortical bone, and many models on the osteonal arrangement have been proposed, limited attention has been paid to trabecular bone ultrastructure. This is surprising because trabeculae play a crucial role for the mechanical strength of several bone sites, including the vertebrae and the femoral head. On this account, we first validated a recently developed method (3D sSAXS or 3D scanning small-angle X-ray scattering) for investigating bone ultrastructure in a quantitative and spatially resolved way, using conventional linearly polarized light microscopy as a gold standard. While both methods are used to analyze thin tissue sections, in contrast to polarized light microscopy, 3D sSAXS has the important advantage that it provides 3D information on the orientation and arrangement of bone ultrastructure. In this first study of its kind, we used 3D sSAXS to investigate the ultrastructural organization of 22 vertebral trabeculae of different alignment, types and sizes, obtained from 4 subjects of different ages. Maps of ultrastructure orientation and arrangement of the trabeculae were retrieved by stacking information from consecutive 20-μm-thick bone sections. The organization of the ultrastructure was analyzed in relation to trabecular microarchitecture obtained from computed tomography and to relevant parameters such as distance to trabecular surface, local curvature or local bone mineralization. We found that (i) ultrastructure organization is similar for all investigated trabeculae independent of their particular characteristics, (ii) bone ultrastructure exhibiting a high degree of orientation was arranged in domains, (iii) highly oriented ultrastructural areas were located closer to the bone surface, (iv) the ultrastructure of the human trabecular bone specimens followed the microarchitecture, being oriented mostly parallel to bone surface, and (v) local surface curvature seems to have an effect on the ultrastructure organization. Further studies that investigate bone ultrastructure orientation and arrangement are needed in order to understand its organization and consequently its relation to bone biology and mechanics.
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Affiliation(s)
| | | | | | | | - Oliver Bunk
- Paul Scherrer Institut (PSI), Villigen, Switzerland
| | - Ralph Müller
- Institute for Biomechanics, ETH Zurich, Zurich, Switzerland
| | - Philipp Schneider
- Institute for Biomechanics, ETH Zurich, Zurich, Switzerland
- Bioengineering Science Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, United Kingdom
- * E-mail:
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Yaari A, Schilt Y, Tamburu C, Raviv U, Shoseyov O. Wet Spinning and Drawing of Human Recombinant Collagen. ACS Biomater Sci Eng 2016; 2:349-360. [DOI: 10.1021/acsbiomaterials.5b00461] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Amit Yaari
- The
Robert H. Smith Faculty of Agriculture, Food and Environment, and
the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem,
P.O. Box 12, Jerusalem, Israel
| | - Yaelle Schilt
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Carmen Tamburu
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Uri Raviv
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Oded Shoseyov
- The
Robert H. Smith Faculty of Agriculture, Food and Environment, and
the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem,
P.O. Box 12, Jerusalem, Israel
- CollPlant Ltd. 3 Sapir Street, P.O. Box 4132, Ness-Ziona, Israel
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Anil DP, Sudhir DP, Saksena A, Khurana N. An Affordable, Indigenous Polarizer-Analyser System with Inbuilt Retardation Plate Function to Detect Birefringence using 3D Glasses: An Experience. J Clin Diagn Res 2016; 10:EC12-4. [PMID: 26894072 DOI: 10.7860/jcdr/2016/15387.7112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 10/30/2015] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Polarizing microscope plays a vital role in few but unique situations. A pair of cross polarizers is used to confirm the presence of birefringent substances. Also, a red retardation plate is needed to evaluate the sign of birefringence. However, a polarizing microscope especially with retardation plate is very expensive. Thus, an affordable yet effective substitute using the 3D Polaroid glasses used for '3D movies' would enable widespread use of the polarizing system. AIM To study the use of 3D polaroid glasses procured from cinema halls in detecting birefringence substances and to study the red retardation plate function in them. MATERIALS AND METHODS Passive 3D Polaroid glasses were procured from cinema halls. They were arranged in aspecific manner to obtain polarized light. Red retardation plate function can be obtained by changing the arrangement of the glasses. These glasses were used with various available models of different light microscope manufacturers. Various specimens observed included amyloid deposits, woven and lamellar bone, skeletal muscle striations, urate crystals, cholesterol crystals, suture material and glove powder. The comparison was based on subjective interpretation of intensity and quality of birefringence. Sign of birefringence was also determined whenever relevant. RESULTS The birefringence observed by our system was comparable to the commercially available polarizing system with respect to intensity and quality. Also, there were no false positive /negative results when compared with the commercial Polarizing microscope. Moreover, the system had an inbuilt red retardation plate to determine sign of birefringence. CONCLUSION The system is efficient, cheap, easily accessible, portable and compatible with all models of light microscopes.
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Affiliation(s)
- Desai Parth Anil
- Resident, Department of Pathology, Maulana Azad Medical College , New Delhi, India
| | - Dange Prasad Sudhir
- Resident, Department of Pathology, Maulana Azad Medical College , New Delhi, India
| | - Annapurna Saksena
- Resident, Department of Pathology, Maulana Azad Medical College , New Delhi, India
| | - Nita Khurana
- Professor, Department of Pathology, Maulana Azad Medical College , New Delhi, India
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Fang M, Dong D, Zeng C, Liang X, Yang X, Arranz A, Ripoll J, Hui H, Tian J. Polarization-sensitive optical projection tomography for muscle fiber imaging. Sci Rep 2016; 6:19241. [PMID: 26752330 PMCID: PMC4707546 DOI: 10.1038/srep19241] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 12/07/2015] [Indexed: 01/22/2023] Open
Abstract
Optical projection tomography (OPT) is a tool used for three-dimensional imaging of millimeter-scale biological samples, with the advantage of exhibiting isotropic resolution typically in the micron range. OPT can be divided into two types: transmission OPT (tOPT) and emission OPT (eOPT). Compared with eOPT, tOPT discriminates different tissues based on their absorption coefficient, either intrinsic or after specific staining. However, it fails to distinguish muscle fibers whose absorption coefficients are similar to surrounding tissues. To circumvent this problem, in this article we demonstrate a polarization sensitive OPT system which improves the detection and 3D imaging of muscle fibers by using polarized light. We also developed image acquisition and processing protocols that, together with the system, enable the clear visualization of muscles. Experimental results show that the muscle fibers of diaphragm and stomach, difficult to be distinguished in regular tOPT, were clearly displayed in our system, proving its potential use. Moreover, polarization sensitive OPT was fused with tOPT to investigate the stomach tissue comprehensively. Future applications of polarization sensitive OPT could be imaging other fiber-like structures such as myocardium or other tissues presenting high optical anisotropy.
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Affiliation(s)
- Mengjie Fang
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.,Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China
| | - Di Dong
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.,Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China
| | - Chaoting Zeng
- Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangdong 510282, China
| | - Xiao Liang
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.,Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China
| | - Xin Yang
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.,Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China
| | - Alicia Arranz
- Center for Molecular Biology "Severo Ochoa" (CSIC-UAM), Madrid 28049, Spain
| | - Jorge Ripoll
- Department of Bioengineering and Aerospace Engineering, Universidad Carlos III of Madrid, Madrid 28911, Spain
| | - Hui Hui
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.,Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China
| | - Jie Tian
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China.,Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China
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Hapach LA, VanderBurgh JA, Miller JP, Reinhart-King CA. Manipulation of in vitro collagen matrix architecture for scaffolds of improved physiological relevance. Phys Biol 2015; 12:061002. [PMID: 26689380 DOI: 10.1088/1478-3975/12/6/061002] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Type I collagen is a versatile biomaterial that is widely used in medical applications due to its weak antigenicity, robust biocompatibility, and its ability to be modified for a wide array of applications. As such, collagen has become a major component of many tissue engineering scaffolds, drug delivery platforms, and substrates for in vitro cell culture. In these applications, collagen constructs are fabricated to recapitulate a diverse set of conditions. Collagen fibrils can be aligned during or post-fabrication, cross-linked via numerous techniques, polymerized to create various fibril sizes and densities, and copolymerized into a wide array of composite scaffolds. Here, we review approaches that have been used to tune collagen to better recapitulate physiological environments for use in tissue engineering applications and studies of basic cell behavior. We discuss techniques to control fibril alignment, methods for cross-linking collagen constructs to modulate stiffness, and composite collagen constructs to better mimic physiological extracellular matrix.
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45
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Ferrand P, Allain M, Chamard V. Ptychography in anisotropic media. OPTICS LETTERS 2015; 40:5144-5147. [PMID: 26565820 DOI: 10.1364/ol.40.005144] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This letter describes ptychography in the context of polarized light probing anisotropic specimen (i.e., showing properties of birefringence and/or diattenuation). We established an optimization strategy using a vectorial formalism. We propose a measurement scheme using a set of linearly polarized probes and linear polarization analyzers, which allows the retrieval of the full anisotropy map of the specimen.
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46
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Mredha MTI, Zhang X, Nonoyama T, Nakajima T, Kurokawa T, Takagi Y, Gong JP. Swim bladder collagen forms hydrogel with macroscopic superstructure by diffusion induced fast gelation. J Mater Chem B 2015; 3:7658-7666. [PMID: 32264576 DOI: 10.1039/c5tb00877h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Marine collagen has been attracting attention as a medical material in recent times due to the low risk of pathogen infection compared to animal collagen. Type I collagen extracted from the swim bladder of Bester sturgeon fish has excellent characteristics such as high denaturation temperature, high solubility, low viscosity and an extremely fast rate to form large bundle of fibers under certain conditions. These specific characteristics of swim bladder collagen (SBC) permit us to create stable, disk shaped hydrogels with concentric orientation of collagen fibers by the controlled diffusion of neutral buffer through collagen solution at room temperature. However, traditionally used animal collagens, e.g. calf skin collagen (CSC) and porcine skin collagen (PSC), could not form any stable and oriented structure by this method. The mechanism of the superstructure formation of SBC by a diffusion induced gelation process has been explored. The fast fibrillogenesis rate of SBC causes a quick squeezing out of the solvent from the gel phase to the sol phase during gelation, which builds an internal stress at the gel-sol interface. The tensile stress induces the collagen molecules of the gel phase to align along the gel-sol interface direction to give this concentric ring-shaped orientation pattern. On the other hand, the slow fibrillogenesis rate of animal collagens due to the high viscosity of the solution does not favor the ordered structure formation. The denaturation temperature of SBC increases significantly from 31 °C to 43 °C after gelation, whereas that of CSC and PSC were found to increase a little. Rheology experiment shows that the SBC gel has storage modulus larger than 15 kPa. The SBC hydrogels with thermal and mechanical stability have potential as bio-materials for tissue engineering applications.
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Alves A, Gritsch K, Sirieix C, Drevon-Gaillot E, Bayon Y, Clermont G, Boutrand JP, Grosgogeat B. Computerized histomorphometric study of the splenic collagen polymorphism: A control-tissue for polarization microscopy. Microsc Res Tech 2015; 78:900-7. [PMID: 26238067 DOI: 10.1002/jemt.22553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 06/12/2015] [Accepted: 07/11/2015] [Indexed: 11/12/2022]
Abstract
Previous articles have pointed out the presence of type III collagen within the extracellular structure of the parenchymatous organs. This study aimed to quantitatively characterize the collagen polymorphism at the capsule and parenchymal trabeculae of the largest lymphoid organ of the body i.e., the spleen, in mouse, rat, and rabbit models. Following a Picrosirius Red-Polarization procedure and computer assisted image analysis of paraffin sections, the results showed (1) a predominant and significantly higher amount of type III collagen in the trabeculae area compared to the capsule area in the three species, (2) no statistical difference among the three species concerning the parenchymal collagen polymorphism or the type I/type III collagen ratio, (3) a heterogeneous type I/type III collagen ratio varying from 0.86 (mouse) to 6.62 (rabbit) in the fibromuscular capsule region. A qualitative analysis corroborated these histomorphometric results. In conclusion, the spleen may be used as (1) a control tissue to qualitatively visualize type I and III collagen under polarization microscopy and to validate the quality of PSR staining (2) an aid to accurately calibrate the angle of polarization before quantitative measurements of type I and type III collagen. Among the studied species, the rabbit spleen appeared to be the most appropriate control tissue as it showed the highest amount of type I collagen in the capsule and a similarly high amount of type III collagen in the parenchymal trabeculae.
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Affiliation(s)
- Antoine Alves
- Laboratoire Des Multimatériaux Et Interfaces (UMR CNRS 5615), Université Lyon 1, Lyon, France.,NAMSA, 115 Rue Pasteur, Chasse-sur-Rhône, 38670, France
| | - Kerstin Gritsch
- Laboratoire Des Multimatériaux Et Interfaces (UMR CNRS 5615), Université Lyon 1, Lyon, France.,Faculté d'Odontologie, Université Lyon 1, Lyon, France.,Service De Consultations Et De Traitements Dentaires, Hospices Civils De Lyon, Lyon, France
| | - Camille Sirieix
- NAMSA, 115 Rue Pasteur, Chasse-sur-Rhône, 38670, France.,Institut Supérieur D'ingénieurs De Franche-Comté, Besançon, France
| | | | - Yves Bayon
- Covidien - Sofradim Production, Trévoux, France
| | | | | | - Brigitte Grosgogeat
- Laboratoire Des Multimatériaux Et Interfaces (UMR CNRS 5615), Université Lyon 1, Lyon, France.,Faculté d'Odontologie, Université Lyon 1, Lyon, France.,Service De Consultations Et De Traitements Dentaires, Hospices Civils De Lyon, Lyon, France
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48
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Nazac A, Bancelin S, Teig B, Ibrahim BH, Fernandez H, Schanne-Klein MC, De Martino A. Optimization of Picrosirius red staining protocol to determine collagen fiber orientations in vaginal and uterine cervical tissues by Mueller polarized microscopy. Microsc Res Tech 2015; 78:723-30. [PMID: 26096960 DOI: 10.1002/jemt.22530] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 05/14/2015] [Indexed: 01/04/2023]
Abstract
Polarized microscopy provides unique information on anisotropic samples. In its most complete implementation, namely Mueller microscopy, this technique is well suited for the visualization of fibrillar proteins orientations, with collagen in the first place. However, the intrinsic optical anisotropy of unstained tissues has to be enhanced by Picrosirius Red (PR) staining to enable Mueller measurements. In this work, we compared the orientation mapping provided by Mueller and second harmonic generation (SHG) microscopies on PR stained samples of vaginal and uterine cervix tissues. SHG is a multiphoton technique that is highly specific to fibrillar collagen, and was taken as the "gold standard" for its visualization. We showed that Mueller microscopy can be safely used to determine collagen orientation in PR stained cervical tissue. In contrast, in vaginal samples, Mueller microscopy revealed orientations not only of collagen but also of other anisotropic structures. Thus PR is not fully specific to collagen, which necessitates comparison to SHG microscopy in every type of tissue. In addition to this study of PR specificity, we determined the optimal values of the staining parameters. We found that staining times of 5 min, and sample thicknesses of 5 µm were sufficient in cervical and vaginal tissues.
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Affiliation(s)
- André Nazac
- Department of Gynecology and Obstetrics, Bicêtre Hospital, Le Kremlin Bicêtre, France.,Laboratoire De Physique Des Interfaces Et Des Couches Minces (LPICM), Ecole Polytechnique, CNRS, Palaiseau, 91128, France
| | - Stéphane Bancelin
- Laboratoire D'optique Et Biosciences, Ecole Polytechnique, CNRS, INSERM U696, Palaiseau, 91128, France
| | - Benjamin Teig
- Department of Anatomopathology, Bicêtre Hospital, Le Kremlin Bicêtre, France
| | - Bicher Haj Ibrahim
- Laboratoire De Physique Des Interfaces Et Des Couches Minces (LPICM), Ecole Polytechnique, CNRS, Palaiseau, 91128, France
| | - Hervé Fernandez
- Department of Gynecology and Obstetrics, Bicêtre Hospital, Le Kremlin Bicêtre, France.,Paris XI University, Orsay, France
| | | | - Antonello De Martino
- Laboratoire De Physique Des Interfaces Et Des Couches Minces (LPICM), Ecole Polytechnique, CNRS, Palaiseau, 91128, France
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Matcher SJ. What can biophotonics tell us about the 3D microstructure of articular cartilage? Quant Imaging Med Surg 2015; 5:143-58. [PMID: 25694964 DOI: 10.3978/j.issn.2223-4292.2014.12.03] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 12/02/2014] [Indexed: 12/30/2022]
Abstract
Connective tissues such as articular cartilage have been the subject of study using novel optical techniques almost since the invention of polarized light microscopy (PLM). Early studies of polarized light micrographs were the main evidential basis for the establishment of quantitative models of articular cartilage collagen structure by Benninghoff and others. Even now, state of the art optical techniques including quantitative polarized light microscopy (qPLM), optical coherence tomography (OCT), polarization-sensitive optical coherence tomography (PS-OCT), second harmonic generation (SHG) microscopy, Fourier-transform infrared (FTIR) microscopy, Raman and optical hyperspectral reflectance and fluorescence imaging are providing new insights into articular cartilage structure from the nanoscale through to the mesoscale. New insights are promised by emerging modalities such as optical elastography. This short review highlights some key recent results from modern optical techniques.
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Affiliation(s)
- Stephen J Matcher
- 1 Department of Materials Science and Engineering, 2 INSIGNEO Institute for in-silico medicine, University of Sheffield, North Campus, Broad Lane, Sheffield, S3 7HQ, UK
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50
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Chang CF. Dr. Frederick H. Kasten 1927 -2014. Biotech Histochem 2014; 90:152-6. [PMID: 25541861 DOI: 10.3109/10520295.2014.984243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Chuan-Fa Chang
- Secretary General of Taiwan Proteomics Society, Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University , Tainan 70101 , Taiwan
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