1
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Miguez PA, Bash E, Musskopf ML, Tuin SA, Rivera-Concepcion A, Chapple ILC, Liu J. Control of tissue homeostasis by the extracellular matrix: Synthetic heparan sulfate as a promising therapeutic for periodontal health and bone regeneration. Periodontol 2000 2024; 94:510-531. [PMID: 37614159 PMCID: PMC10891305 DOI: 10.1111/prd.12515] [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: 06/19/2023] [Revised: 07/13/2023] [Accepted: 07/22/2023] [Indexed: 08/25/2023]
Abstract
Proteoglycans are core proteins associated with carbohydrate/sugar moieties that are highly variable in disaccharide composition, which dictates their function. These carbohydrates are named glycosaminoglycans, and they can be attached to proteoglycans or found free in tissues or on cell surfaces. Glycosaminoglycans such as hyaluronan, chondroitin sulfate, dermatan sulfate, keratan sulfate, and heparin/heparan sulfate have multiple functions including involvement in inflammation, immunity and connective tissue structure, and integrity. Heparan sulfate is a highly sulfated polysaccharide that is abundant in the periodontium including alveolar bone. Recent evidence supports the contention that heparan sulfate is an important player in modulating interactions between damage associated molecular patterns and inflammatory receptors expressed by various cell types. The structure of heparan sulfate is reported to dictate its function, thus, the utilization of a homogenous and structurally defined heparan sulfate polysaccharide for modulation of cell function offers therapeutic potential. Recently, a chemoenzymatic approach was developed to allow production of many structurally defined heparan sulfate carbohydrates. These oligosaccharides have been studied in various pathological inflammatory conditions to better understand their function and their potential application in promoting tissue homeostasis. We have observed that specific size and sulfation patterns can modulate inflammation and promote tissue maintenance including an anabolic effect in alveolar bone. Thus, new evidence provides a strong impetus to explore heparan sulfate as a potential novel therapeutic agent to treat periodontitis, support alveolar bone maintenance, and promote bone formation.
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Affiliation(s)
- PA Miguez
- Division of Comprehensive Oral Health - Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA
| | - E Bash
- Division of Comprehensive Oral Health - Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA
| | - ML Musskopf
- Division of Comprehensive Oral Health - Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA
| | - SA Tuin
- Oral and Craniofacial Health Sciences, Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA
| | - A Rivera-Concepcion
- Oral and Craniofacial Health Sciences, Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA
| | - ILC Chapple
- Periodontal Research Group, School of Dentistry, Institute of Clinical Sciences, College of Medical and Dental Sciences, Birmingham’s NIHR BRC in Inflammation Research, University of Birmingham and Birmingham Community Health Foundation Trust, Birmingham UK Iain Chapple
| | - J Liu
- Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC, USA
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2
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Gupta S, Buyank F, Sinha NR, Grant DG, Sinha PR, Iozzo RV, Chaurasia SS, Mohan RR. Decorin regulates collagen fibrillogenesis during corneal wound healing in mouse in vivo. Exp Eye Res 2022; 216:108933. [PMID: 35031282 PMCID: PMC8885890 DOI: 10.1016/j.exer.2022.108933] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 12/14/2021] [Accepted: 01/05/2022] [Indexed: 12/22/2022]
Abstract
A characteristic rigid spatial arrangement of collagen fibrils in the stroma is critical for corneal transparency. This unique organization of collagen fibrils in corneal stroma can be impacted by the presence and interactions of proteoglycans and extracellular matrix (ECM) proteins in a corneal microenvironment. Earlier studies revealed that decorin, a leucine-rich proteoglycan in stroma, regulates keratocyte-collagen matrix assembly and wound healing in the cornea. This study investigated the role of decorin in the regulation of stromal fibrillogenesis and corneal transparency in vivo employing a loss-of-function genetic approach using decorin null (dcn-/-) and wild type (dcn+/+) mice and a standard alkali-injury model. A time-dependent ocular examinations with Slit lamp microscope in live animals assessed corneal clarity, haze, and neovascularization levels in normal and injured eyes. Morphometric changes in normal and injured dcn+/+ and dcn-/- corneas, post-euthanasia, were analyzed with Masson's Trichrome and Periodic Acid-Schiff (PAS) histology evaluations. The ultrastructure changes in all corneas were investigated with transmission electron microscopy (TEM). Injury to eye produced clinically relevant corneal haze and neovascularization in dcn-/- and dcn+/+ mice while corneas of uninjured eyes remained clear and avascular. A clinically significant haze and neovascularization appeared in injured dcn-/- corneas compared to the dcn+/+ corneas at day 21 post-injury and not at early tested times. Histological examinations revealed noticeably abnormal morphology and compromised collagen levels in injured dcn-/- corneas compared to the injured/normal dcn+/+ and uninjured dcn-/- corneas. TEM analysis exhibited remarkably uneven collagen fibrils size and distribution in the stroma with asymmetrical organization and loose packing in injured dcn-/- corneas than injured/normal dcn+/+ and uninjured dcn-/- corneas. The minimum and maximum inter-fibril distances were markedly irregular in injured dcn-/- corneas compared to all other corneas. Together, results of clinical, histological, and ultrastructural investigations in a genetic knockout model suggested that decorin influenced stromal fibrillogenesis and transparency in healing cornea.
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Affiliation(s)
- Suneel Gupta
- Harry S. Truman Memorial Veterans’ Hospital, Columbia, Missouri, USA.,Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA
| | - Filiz Buyank
- Department of Computer Science, University of Missouri, Columbia, Missouri, USA
| | - Nihant R. Sinha
- Harry S. Truman Memorial Veterans’ Hospital, Columbia, Missouri, USA.,Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA
| | - DeAna G. Grant
- Electron Microscopy Core, University of Missouri, Columbia, Missouri, USA
| | - Prashant R. Sinha
- Harry S. Truman Memorial Veterans’ Hospital, Columbia, Missouri, USA.,Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA
| | - Renato V. Iozzo
- Department of Pathology, Anatomy, and Cell Biology, and Translational Cellular Oncology Program, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Shyam S. Chaurasia
- Harry S. Truman Memorial Veterans’ Hospital, Columbia, Missouri, USA.,Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA
| | - Rajiv R. Mohan
- Harry S. Truman Memorial Veterans’ Hospital, Columbia, Missouri, USA.,Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA.,Mason Eye Institute, School of Medicine, University of Missouri, Columbia, Missouri, USA.,Corresponding author: Rajiv R. Mohan, MS, PhD, FARVO, Professor of Ophthalmology & Molecular Medicine, University of Missouri, 1600 E. Rollins Rd, Columbia, MO 65211,
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3
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Allaith S, Tew SR, Hughes CE, Clegg PD, Canty-Laird EG, Comerford EJ. Characterisation of key proteoglycans in the cranial cruciate ligaments (CCLs) from two dog breeds with different predispositions to CCL disease and rupture. Vet J 2021; 272:105657. [PMID: 33941333 DOI: 10.1016/j.tvjl.2021.105657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 03/15/2021] [Accepted: 03/17/2021] [Indexed: 11/23/2022]
Abstract
Cranial cruciate ligament disease and rupture (CCLD/R) is one of the most common orthopaedic conditions in dogs, eventually leading to osteoarthritis of the stifle joint. Certain dog breeds such as the Staffordshire bull terrier have an increased risk of developing CCLD/R. Previous studies into CCLD/R have found that glycosaminoglycan levels were elevated in cranial cruciate ligament (CCL) tissue from high-risk breeds when compared to the CCL from a low-risk breed to CCLD/R. Our objective was to determine specific proteoglycans/glycosaminoglycans in the CCL and to see whether their content was altered in dog breeds with differing predispositions to CCLD/R. Disease-free CCLs from Staffordshire bull terriers (moderate/high-risk to CCLD/R) and Greyhounds (low-risk to CCLD/R) were collected and key proteoglycan/glycosaminoglycans were determined by semi-quantitative Western blotting, quantitative biochemistry, quantitative reverse transcription polymerase chain reaction, and immunohistochemistry. Gene expression of fibromodulin (P = 0.03), aggrecan (P = 0.0003), and chondroitin-6-sulphate stubs (P = 0.01) were significantly increased, and for fibromodulin this correlated with an increase in protein content in Staffordshire bull terriers compared to Greyhound CCLs (P = 0.02). Decorin (P = 0.03) and ADAMTS-4 (P = 0.04) gene expression were significantly increased in Greyhounds compared to Staffordshire bull terrier CCLs. The increase of specific proteoglycans and glycosaminoglycans within the Staffordshire bull terrier CCLs may indicate a response to higher compressive loads, potentially altering their risk to traumatic injury. The higher decorin content in the Greyhound CCLs is essential for maintaining collagen fibril strength, while the increase of ADAMTS-4 indicates a higher rate of turnover helping to regulate normal CCL homeostasis in Greyhounds.
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Affiliation(s)
- S Allaith
- Department of Musculoskeletal and Ageing Science, Institute of Life Course and Medical Sciences, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK; The Medical Research Council Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA), UK
| | - S R Tew
- Department of Musculoskeletal and Ageing Science, Institute of Life Course and Medical Sciences, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK; The Medical Research Council Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA), UK
| | - C E Hughes
- School of Biosciences, University of Cardiff, Sir Martin Evans Building, Museum Avenue, Cardiff, CF 10 3AX, UK
| | - P D Clegg
- Department of Musculoskeletal and Ageing Science, Institute of Life Course and Medical Sciences, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK; The Medical Research Council Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA), UK
| | - E G Canty-Laird
- Department of Musculoskeletal and Ageing Science, Institute of Life Course and Medical Sciences, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK; The Medical Research Council Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA), UK
| | - E J Comerford
- Department of Musculoskeletal and Ageing Science, Institute of Life Course and Medical Sciences, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK; Small Animal Teaching Hospital, Leahurst Campus, School of Veterinary Science, University of Liverpool, Chester High Rd, Neston CH64 7TE, UK; The Medical Research Council Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA), UK.
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4
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Zheng T, Zhao C, Zhao B, Liu H, Wang S, Wang L, Liu P. Impairment of the autophagy-lysosomal pathway and activation of pyroptosis in macular corneal dystrophy. Cell Death Discov 2020; 6:85. [PMID: 32983576 PMCID: PMC7487068 DOI: 10.1038/s41420-020-00320-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/18/2020] [Accepted: 08/27/2020] [Indexed: 01/05/2023] Open
Abstract
Macular corneal dystrophy (MCD) is ascribed to mutations in the carbohydrate sulfotransferase (CHST6) gene affecting keratan sulfate (KS) hydrophilicity and causing non-sulfated KS to precipitate in keratocytes and the corneal stroma. We investigated roles for inflammatory responses in MCD pathogenesis by examining the lysosomal-autophagy pathway and activation of pyroptosis in MCD keratocytes. Normal and lesioned keratocytes were obtained from MCD patients undergoing corneal transplantation. The keratocytes were subjected to gene sequencing, RT-PCR, western blotting, transmission electron microscopy, histological staining, induction and inhibition assays of autophagy and pyroptosis, CCK-8 and LysoTracker Green DND-26 labeling, and flow cytometry. A novel homozygous MCD mutation was identified in a family from Northeast China; the mutation was distinguished by cytoplasmic vacuolation, cell membrane disruption, electron dense deposits, and deposition of a band of Periodic acid-Schiff and Alcian blue-positive material in the keratocytes and stroma layer. KS protein levels were decreased, expression of p62 and LC3-II proteins was enhanced, cathepsin D expression was declined and the LysoTracker Green DND-26 signal was dramatically reduced in MCD keratocytes. Bafilomycin-A1 treatment significantly increased caspase-1 and Pro-IL-1β expression in normal and MCD keratocytes. Nod-like receptors pyrins-3 (NLRP3), caspase-1, Pro-IL-1β, and IL-1β levels were pronouncedly elevated in cells exposed to H2O2. Ac-YVAD-CMK treatment reversed this expression in normal and MCD keratocytes. Suppression of the autophagic degradation of non-sulfated KS by impaired autophagic flux in MCD keratocytes triggers pyroptosis. Amelioration of impaired autophagy and restraint of pyroptosis may, therefore, have therapeutic efficacy in the treatment of MCD.
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Affiliation(s)
- Tao Zheng
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001 China
| | - Chuchu Zhao
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001 China
| | - Baowen Zhao
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001 China
| | - Hanruo Liu
- The Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, 100730 China
| | - Shijian Wang
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001 China
| | - Liyuan Wang
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001 China
| | - Ping Liu
- Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001 China
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5
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Soh YQ, Kocaba V, Weiss JS, Jurkunas UV, Kinoshita S, Aldave AJ, Mehta JS. Corneal dystrophies. Nat Rev Dis Primers 2020; 6:46. [PMID: 32528047 DOI: 10.1038/s41572-020-0178-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/24/2020] [Indexed: 12/21/2022]
Abstract
Corneal dystrophies are broadly defined as inherited disorders that affect any layer of the cornea and are usually progressive, bilateral conditions that do not have systemic effects. The 2015 International Classification of Corneal Dystrophies classifies corneal dystrophies into four classes: epithelial and subepithelial dystrophies, epithelial-stromal TGFBI dystrophies, stromal dystrophies and endothelial dystrophies. Whereas some corneal dystrophies may result in few or mild symptoms and morbidity throughout a patient's lifetime, others may progress and eventually result in substantial visual and ocular disturbances that require medical or surgical intervention. Corneal transplantation, either with full-thickness or partial-thickness donor tissue, may be indicated for patients with advanced corneal dystrophies. Although corneal transplantation techniques have improved considerably over the past two decades, these surgeries are still associated with postoperative risks of disease recurrence, graft failure and other complications that may result in blindness. In addition, a global shortage of cadaveric corneal graft tissue critically limits accessibility to corneal transplantation in some parts of the world. Ongoing advances in gene therapy, regenerative therapy and cell augmentation therapy may eventually result in the development of alternative, novel treatments for corneal dystrophies, which may substantially improve the quality of life of patients with these disorders.
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Affiliation(s)
- Yu Qiang Soh
- Tissue Engineering and Cell Therapy Group, Singapore Eye Research Institute, Singapore, Singapore.,Singapore National Eye Centre, Singapore, Singapore.,Ophthalmology Academic Clinical Program, Duke-NUS Graduate Medical School, Singapore, Singapore.,Department of Clinical Sciences, Duke-NUS Graduate Medical School, Singapore, Singapore
| | - Viridiana Kocaba
- Tissue Engineering and Cell Therapy Group, Singapore Eye Research Institute, Singapore, Singapore.,Netherlands Institute for Innovative Ocular Surgery, Rotterdam, Netherlands
| | - Jayne S Weiss
- Department of Ophthalmology, Pathology and Pharmacology, Louisiana State University, School of Medicine, New Orleans, USA
| | - Ula V Jurkunas
- Cornea and Refractive Surgery Service, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA.,Schepens Eye Research Institute, Boston, Massachusetts, USA.,Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Shigeru Kinoshita
- Department of Frontier Medical Science and Technology for Ophthalmology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Anthony J Aldave
- Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | - Jodhbir S Mehta
- Tissue Engineering and Cell Therapy Group, Singapore Eye Research Institute, Singapore, Singapore. .,Singapore National Eye Centre, Singapore, Singapore. .,Ophthalmology Academic Clinical Program, Duke-NUS Graduate Medical School, Singapore, Singapore. .,Department of Clinical Sciences, Duke-NUS Graduate Medical School, Singapore, Singapore.
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6
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Naffa R, Maidment C, Ahn M, Ingham B, Hinkley S, Norris G. Molecular and structural insights into skin collagen reveals several factors that influence its architecture. Int J Biol Macromol 2019; 128:509-520. [DOI: 10.1016/j.ijbiomac.2019.01.151] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 01/17/2019] [Accepted: 01/26/2019] [Indexed: 10/27/2022]
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7
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Moorehead C, Prudnikova K, Marcolongo M. The regulatory effects of proteoglycans on collagen fibrillogenesis and morphology investigated using biomimetic proteoglycans. J Struct Biol 2019; 206:204-215. [DOI: 10.1016/j.jsb.2019.03.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 03/11/2019] [Accepted: 03/13/2019] [Indexed: 01/26/2023]
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8
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de Oliveira G, Freire PP, Omoto ACM, Cury SS, Fuziwara CS, Kimura ET, Dal-Pai-Silva M, Carvalho RF. Osteoglycin post-transcriptional regulation by miR-155 induces cellular architecture changes in H9c2 cardiomyoblasts. Gene 2018; 676:9-15. [PMID: 29990505 DOI: 10.1016/j.gene.2018.07.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 07/01/2018] [Accepted: 07/06/2018] [Indexed: 01/20/2023]
Abstract
Several studies have demonstrated dysregulated cardiac microRNAs (miRNAs) following cardiac stress and development of cardiac hypertrophy and failure. miRNAs are also differentially expressed in the inflammation that occurs in heart failure and, among these inflammatory-related miRNAs, the miR-155 has been implicated in the regulation of cardiac hypertrophy. Despite these data showing the role of miRNA-155 in cardiomyocyte hypertrophy under a hypertrophic stimulus, it is also important to understand the endogenous regulation of this miRNA without a hypertrophic stimulus to fully appreciate its function in this cell type. The first aim of the present study was to determine whether, without a hypertrophic stimulus, miR-155 overexpression induces H9c2 cardiac cells hypertrophy in vitro. The second objective was to determine whether osteoglycin (Ogn), a key regulator of heart mass in rats, mice, and humans, is post-transcriptionally regulated by miR-155 with a potential role in inducing H9c2 cells hypertrophy. Here, we show that, without a hypertrophic stimulus, miR-155 significantly repressed Ogn protein levels, but induce neither alteration in morphological phenotype nor in the expression of the molecular markers that fully characterize pathological hypertrophy of H9c2 cells. However, most importantly, Ogn silencing in H9c2 cells mimicked the effects of miR-155 overexpression in inducing cellular architecture changes that were characterized by a transition of the cell shape from fusiform to rounded. This is a new role of the post-transcriptional regulation of Ogn by miR-155 in the maintenance of the cardiac cell morphology in physiological and pathological conditions.
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Affiliation(s)
- Grasieli de Oliveira
- Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Paula Paccielli Freire
- Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Ana Carolina Mieko Omoto
- Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Sarah Santiloni Cury
- Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Cesar Seigi Fuziwara
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Edna Teruko Kimura
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Maeli Dal-Pai-Silva
- Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Robson Francisco Carvalho
- Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil.
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9
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Andrade AL, Campos MQ, Gomes JAP, Berto AGA, Michelacci YM. Effect of Amniotic Membrane Transplantation on Corneal Healing and Proteoglycan Expression in an Experimental Model of Limbal Deficiency in Rabbits. Eur J Ophthalmol 2018; 20:290-9. [DOI: 10.1177/112067211002000206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Alexandre L. Andrade
- Department of Clinical Surgery and Animal Reproduction, Universidade Estadual Paulista, Araçatuba
| | - Mauro Q. Campos
- Department of Ophthalmology, Universidade Federal de São Paulo, São Paulo - Brazil
| | - José A. P. Gomes
- Department of Ophthalmology, Universidade Federal de São Paulo, São Paulo - Brazil
| | | | - Yara M. Michelacci
- Department of Biochemistry, Universidade Federal de São Paulo, São Paulo - Brazil
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10
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Sarkar S, Moorehead C, Prudnikova K, Schauer CL, Penn LS, Marcolongo M. Synthesis of macromolecular mimics of small leucine-rich proteoglycans with a poly(ethylene glycol) core and chondroitin sulphate bristles. Carbohydr Polym 2017; 166:338-347. [DOI: 10.1016/j.carbpol.2017.02.083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 01/26/2017] [Accepted: 02/20/2017] [Indexed: 12/15/2022]
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11
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Collier TA, Nash A, Birch HL, de Leeuw NH. Intra-molecular lysine-arginine derived advanced glycation end-product cross-linking in Type I collagen: A molecular dynamics simulation study. Biophys Chem 2016; 218:42-46. [PMID: 27648753 PMCID: PMC5068345 DOI: 10.1016/j.bpc.2016.09.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 09/12/2016] [Indexed: 01/31/2023]
Abstract
Covalently cross-linked advanced glycation end products (AGE) are among the major post-translational modifications to proteins as a result of non-enzymatic glycation. The formation of AGEs has been shown to have adverse effects on the properties of the collagenous tissue; they are even linked to a number of age related disorders. Little is known about the sites at which these AGEs form or why certain sites within the collagen are energetically more favourable than others. In this study we have used a proven fully atomistic molecular dynamics approach to identify six sites where the formation of the intra-molecular 3-deoxyglucosone-derived imidazolium cross-link (DOGDIC) is energetically favourable. We have also conducted a comparison of these positions with those of the more abundant glucosepane cross-link, to determine any site preference. We show that when we consider both lysine and arginine AGEs, they exhibit a prevalence to form within the gap region of the collagen fibril.
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Affiliation(s)
- Thomas A Collier
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Anthony Nash
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Helen L Birch
- Institute of Orthopaedics and Musculoskeletal Science, UCL, RNOH Stanmore Campus, London, United Kingdom
| | - Nora H de Leeuw
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom; School of Chemistry, Cardiff University, Cardiff CF10 1DF, United Kingdom.
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12
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Kamma-Lorger CS, Pinali C, Martínez JC, Harris J, Young RD, Bredrup C, Crosas E, Malfois M, Rødahl E, Meek KM, Knupp C. Role of Decorin Core Protein in Collagen Organisation in Congenital Stromal Corneal Dystrophy (CSCD). PLoS One 2016; 11:e0147948. [PMID: 26828927 PMCID: PMC4734740 DOI: 10.1371/journal.pone.0147948] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 01/11/2016] [Indexed: 11/18/2022] Open
Abstract
The role of Decorin in organising the extracellular matrix was examined in normal human corneas and in corneas from patients with Congenital Stromal Corneal Dystrophy (CSCD). In CSCD, corneal clouding occurs due to a truncating mutation (c.967delT) in the decorin (DCN) gene. Normal human Decorin protein and the truncated one were reconstructed in silico using homology modelling techniques to explore structural changes in the diseased protein. Corneal CSCD specimens were also examined using 3-D electron tomography and Small Angle X-ray diffraction (SAXS), to image the collagen-proteoglycan arrangement and to quantify fibrillar diameters, respectively. Homology modelling showed that truncated Decorin had a different spatial geometry to the normal one, with the truncation removing a major part of the site that interacts with collagen, compromising its ability to bind effectively. Electron tomography showed regions of abnormal stroma, where collagen fibrils came together to form thicker fibrillar structures, showing that Decorin plays a key role in the maintenance of the order in the normal corneal extracellular matrix. Average diameter of individual fibrils throughout the thickness of the cornea however remained normal.
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Affiliation(s)
- Christina S. Kamma-Lorger
- NCD-BL11, ALBA Synchrotron Light Source, Cerdanyola del Vallés, 08290, Barcelona, Spain
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
| | - Christian Pinali
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
| | - Juan Carlos Martínez
- NCD-BL11, ALBA Synchrotron Light Source, Cerdanyola del Vallés, 08290, Barcelona, Spain
| | - Jon Harris
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
| | - Robert D. Young
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
| | - Cecilie Bredrup
- Department of Ophthalmology, Haukeland University Hospital, 5021 Bergen, Norway
| | - Eva Crosas
- NCD-BL11, ALBA Synchrotron Light Source, Cerdanyola del Vallés, 08290, Barcelona, Spain
| | - Marc Malfois
- NCD-BL11, ALBA Synchrotron Light Source, Cerdanyola del Vallés, 08290, Barcelona, Spain
| | - Eyvind Rødahl
- Department of Ophthalmology, Haukeland University Hospital, 5021 Bergen, Norway
- Department of Clinical Medicine, University of Bergen, 5020 Bergen, Norway
| | - Keith M. Meek
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
| | - Carlo Knupp
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
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13
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Effect of proteoglycans at interfaces as related to location, architecture, and mechanical cues. Arch Oral Biol 2015; 63:82-92. [PMID: 26741830 DOI: 10.1016/j.archoralbio.2015.11.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 08/15/2015] [Accepted: 11/24/2015] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Covalently bound functional GAGs orchestrate tissue mechanics through time-dependent characteristics. OBJECTIVE The role of specific glycosaminoglycans (GAGs) at the ligament-cementum and cementum-dentin interfaces within a human periodontal complex were examined. Matrix swelling and resistance to compression under health and modeled diseased states was investigated. MATERIALS AND METHODS The presence of keratin sulfate (KS) and chondroitin sulfate (CS) GAGs at the ligament-cementum and cementum-dentin interfaces in human molars (N=5) was illustrated by using enzymes, atomic force microscopy (AFM), and AFM-based nanoindentation. The change in physical characteristics of modeled diseased states through sequential digestion of keratin sulfate (KS) and chondroitin sulfate (CS) GAGs was investigated. One-way ANOVA tests with P<0.05 were performed to determine significant differences between groups. Additionally, the presence of mineral within the seemingly hygroscopic interfaces was investigated using transmission electron microscopy. RESULTS Immunohistochemistry (N=3) indicated presence of biglycan and fibromodulin small leucine rich proteoglycans at the interfaces. Digestion of matrices with enzymes confirmed the presence of KS and CS GAGs at the interfaces by illustrating a change in tissue architecture and mechanics. A significant increase in height (nm), decrease in elastic modulus (GPa), and tissue deformation rate (nm/s) of the PDL-C attachment site (215±63-424±94nm; 1.5±0.7-0.4±0.2GPa; 21±7-48±22nm/s), and cementum-dentin interface (122±69-360±159nm; 2.9±1.3-0.7±0.3GPa; 18±4-30±6nm/s) was observed. CONCLUSIONS The sequential removal of GAGs indicated loss in intricate structural hierarchy of hygroscopic interfaces. From a mechanics perspective, GAGs provide tissue recovery/resilience. The results of this study provide insights into the role of GAGs toward conserved tooth movement in the socket in response to mechanical loads, and modulation of potentially deleterious strain at tissue interfaces.
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Gallhoefer NS, Spiess BM, Guscetti F, Hilbe M, Hartnack S, Hafezi F, Pot SA. Penetration depth of corneal cross‐linking with riboflavin and
UV
‐A (
CXL
) in horses and rabbits. Vet Ophthalmol 2015. [DOI: 10.1111/vop.12301] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicolin S. Gallhoefer
- Augen Vet Lindenthalguertel 83 50935 Cologne Germany
- Division of Ophthalmology Equine Department Vetsuisse Faculty University of Zurich Winterthurerstrasse 260, 8057 Zurich Switzerland
- Center for Clinical Studies Vetsuisse Faculty University of Zurich Winterthurerstrasse 260, 8057 Zurich Switzerland
| | - Bernhard M. Spiess
- Division of Ophthalmology Equine Department Vetsuisse Faculty University of Zurich Winterthurerstrasse 260, 8057 Zurich Switzerland
| | - Franco Guscetti
- Institute of Veterinary Pathology Vetsuisse Faculty University of Zurich Winterthurerstrasse 268, 8057 Zurich Switzerland
| | - Monika Hilbe
- Institute of Veterinary Pathology Vetsuisse Faculty University of Zurich Winterthurerstrasse 268, 8057 Zurich Switzerland
| | - Sonja Hartnack
- Division of Veterinary Epidemiology Vetsuisse Faculty University of Zurich Winterthurerstrasse 260, 8057 Zurich Switzerland
| | - Farhad Hafezi
- Laboratory for Ocular Cell Biology University of Geneva Rue Alcide‐Jentzer 22 CH‐1211 Geneva 14 Switzerland
- Department of Ophthalmology University of Southern California 1450 San Pablo St. Los Angeles CA 90033 USA
- The ELZA Institute AG Webereistrasse 2 8953 Dietikon Zurich Switzerland
| | - Simon A. Pot
- Division of Ophthalmology Equine Department Vetsuisse Faculty University of Zurich Winterthurerstrasse 260, 8057 Zurich Switzerland
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15
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Massoudi D, Malecaze F, Galiacy SD. Collagens and proteoglycans of the cornea: importance in transparency and visual disorders. Cell Tissue Res 2015. [PMID: 26205093 DOI: 10.1007/s00441-015-2233-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The cornea represents the external part of the eye and consists of an epithelium, a stroma and an endothelium. Due to its curvature and transparency this structure makes up approximately 70% of the total refractive power of the eye. This function is partly made possible by the particular organization of the collagen extracellular matrix contained in the corneal stroma that allows a constant refractive power. The maintenance of such an organization involves other molecules such as type V collagen, FACITs (fibril-associated collagens with interrupted triple helices) and SLRPs (small leucine-rich proteoglycans). These components play crucial roles in the preservation of the correct organization and function of the cornea since their absence or modification leads to abnormalities such as corneal opacities. Thus, the aim of this review is to describe the different corneal collagens and proteoglycans by highlighting their importance in corneal transparency as well as their implication in corneal visual disorders.
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Affiliation(s)
| | - Francois Malecaze
- EA4555, Université Toulouse III Paul Sabatier, Toulouse, France
- CHU Toulouse, Hôpital Purpan, Service d'Ophtalmologie, Toulouse, France
| | - Stephane D Galiacy
- EA4555, Université Toulouse III Paul Sabatier, Toulouse, France.
- CHU Toulouse, Hôpital Purpan, Service d'Ophtalmologie, Toulouse, France.
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16
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Meek KM, Knupp C. Corneal structure and transparency. Prog Retin Eye Res 2015; 49:1-16. [PMID: 26145225 PMCID: PMC4655862 DOI: 10.1016/j.preteyeres.2015.07.001] [Citation(s) in RCA: 466] [Impact Index Per Article: 51.8] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 06/28/2015] [Accepted: 07/01/2015] [Indexed: 12/13/2022]
Abstract
The corneal stroma plays several pivotal roles within the eye. Optically, it is the main refracting lens and thus has to combine almost perfect transmission of visible light with precise shape, in order to focus incoming light. Furthermore, mechanically it has to be extremely tough to protect the inner contents of the eye. These functions are governed by its structure at all hierarchical levels. The basic principles of corneal structure and transparency have been known for some time, but in recent years X-ray scattering and other methods have revealed that the details of this structure are far more complex than previously thought and that the intricacy of the arrangement of the collagenous lamellae provides the shape and the mechanical properties of the tissue. At the molecular level, modern technologies and theoretical modelling have started to explain exactly how the collagen fibrils are arranged within the stromal lamellae and how proteoglycans maintain this ultrastructure. In this review we describe the current state of knowledge about the three-dimensional stromal architecture at the microscopic level, and about the control mechanisms at the nanoscopic level that lead to optical transparency.
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Affiliation(s)
- Keith M Meek
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff CF24 4HQ, UK.
| | - Carlo Knupp
- Structural Biophysics Research Group, School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff CF24 4HQ, UK
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17
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Collier TA, Nash A, Birch HL, de Leeuw NH. Preferential sites for intramolecular glucosepane cross-link formation in type I collagen: A thermodynamic study. Matrix Biol 2015; 48:78-88. [PMID: 26049074 PMCID: PMC4659457 DOI: 10.1016/j.matbio.2015.06.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 05/29/2015] [Accepted: 06/01/2015] [Indexed: 11/30/2022]
Abstract
The extracellular matrix (ECM) undergoes progressive age-related stiffening and loss of proteolytic digestibility due to an increase in concentration of advanced glycation end products (AGEs). The most abundant AGE, glucosepane, accumulates in collagen with concentrations over 100 times greater than all other AGEs. Detrimental collagen stiffening properties are believed to play a significant role in several age-related diseases such as osteoporosis and cardiovascular disease. Currently little is known of the potential location of covalently cross-linked glucosepane formation within collagen molecules; neither are there reports on how the respective cross-link sites affect the physical and biochemical properties of collagen. Using fully atomistic molecular dynamics simulations (MD) we have identified six sites where the formation of a covalent intra-molecular glucosepane cross-link within a single collagen molecule in a fibrillar environment is energetically favourable. Identification of these favourable sites enables us to align collagen cross-linking with experimentally observed changes to the ECM. For example, formation of glucosepane was found to be energetically favourable within close proximity of the Matrix Metalloproteinase-1 (MMP1) binding site, which could potentially disrupt collagen degradation. We conduct fully atomistic molecular dynamics simulation of fibrillar collagen. Glucosepane cross-link formation is energetically favourable at six positions. Positions identified are within key collagen biomolecule sites. Positioning of sites may have a significant effect on tissue function and integrity.
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Affiliation(s)
- Thomas A Collier
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom.
| | - Anthony Nash
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Helen L Birch
- Institute of Orthopaedics and Musculoskeletal Science, UCL, RNOH Stanmore Campus, London, United Kingdom
| | - Nora H de Leeuw
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
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18
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Van Aelst LN, Voss S, Carai P, Van Leeuwen R, Vanhoutte D, Sanders-van Wijk S, Eurlings L, Swinnen M, Verheyen FK, Verbeken E, Nef H, Troidl C, Cook SA, Brunner-La Rocca HP, Möllmann H, Papageorgiou AP, Heymans S. Osteoglycin Prevents Cardiac Dilatation and Dysfunction After Myocardial Infarction Through Infarct Collagen Strengthening. Circ Res 2015; 116:425-36. [DOI: 10.1161/circresaha.116.304599] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Rationale:
To maintain cardiac mechanical and structural integrity after an ischemic insult, profound alterations occur within the extracellular matrix. Osteoglycin is a small leucine-rich proteoglycan previously described as a marker of cardiac hypertrophy.
Objective:
To establish whether osteoglycin may play a role in cardiac integrity and function after myocardial infarction (MI).
Methods and Results:
Osteoglycin expression is associated with collagen deposition and scar formation in mouse and human MI. Absence of osteoglycin in mice resulted in significantly increased rupture-related mortality with tissue disruption, intramyocardial bleeding, and increased cardiac dysfunction, despite equal infarct sizes. Surviving osteoglycin null mice had greater infarct expansion in comparison with wild-type mice because of impaired collagen fibrillogenesis and maturation in the infarcts as revealed by electron microscopy and collagen polarization. Absence of osteoglycin did not affect cardiomyocyte hypertrophy in the remodeling remote myocardium. In cultured fibroblasts, osteoglycin knockdown or supplementation did not alter transforming growth factor-β signaling. Adenoviral overexpression of osteoglycin in wild-type mice significantly improved collagen quality, thereby blunting cardiac dilatation and dysfunction after MI. In osteoglycin null mice, adenoviral overexpression of osteoglycin was unable to prevent rupture-related mortality because of insufficiently restoring osteoglycin protein levels in the heart. Finally, circulating osteoglycin levels in patients with heart failure were significantly increased in the patients with a previous history of MI compared with those with nonischemic heart failure and correlated with survival, left ventricular volumes, and other markers of fibrosis.
Conclusions:
Increased osteoglycin expression in the infarct scar promotes proper collagen maturation and protects against cardiac disruption and adverse remodeling after MI. In human heart failure, osteoglycin is a promising biomarker for ischemic heart failure.
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Affiliation(s)
- Lucas N.L. Van Aelst
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Sandra Voss
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Paolo Carai
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Rick Van Leeuwen
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Davy Vanhoutte
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Sandra Sanders-van Wijk
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Luc Eurlings
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Melissa Swinnen
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Fons K. Verheyen
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Eric Verbeken
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Holger Nef
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Christian Troidl
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Stuart A. Cook
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Hans-Peter Brunner-La Rocca
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Helge Möllmann
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Anna-Pia Papageorgiou
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
| | - Stephane Heymans
- From the Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, Catholic University of Leuven, Leuven, Belgium (L.N.L.V.A., P.C., A.-P.P., S.H.); Department of Cardiology (L.N.L.V.A., M.S.) and Department of Pathology (E.V.), University Hospitals Leuven, Leuven, Belgium; Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany (S.V., H.N., C.T., H.M.); Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), University Hospital
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19
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Tatara Y, Kakizaki I, Suto S, Ishioka H, Negishi M, Endo M. Chondroitin sulfate cluster of epiphycan from salmon nasal cartilage defines binding specificity to collagens. Glycobiology 2014; 25:557-69. [PMID: 25533443 DOI: 10.1093/glycob/cwu186] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Epiphycan (EPY) from salmon nasal cartilage has a glycosaminoglycan (GAG) domain that is heavily modified by chondroitin 4-sulfate and chondroitin 6-sulfate. The functional role of the GAG domain has not been investigated. The interaction of EPY with collagen was examined in vitro using surface plasmon resonance analysis. EPY was found to bind to type I collagen via clustered chondroitin sulfate (CS), while a single chain of CS was unable to bind. Types I, III, VII, VIII and X collagen showed high binding affinity with EPY, whereas types II, IV, V, VI and IX showed low binding affinities. Chemical modification of lysine residues in collagen decreased the affinity with the clustered CS. These results suggest that lysine residues of collagen are involved in the interaction with the clustered CS, and the difference in lysine modification defines the binding affinity to EPY. The clustered CS was also involved in an inter-saccharide interaction, and formed self-associated EPY. CS of EPY promoted fibril formation of type I collagen.
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Affiliation(s)
- Yota Tatara
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan Department of Glycobiomedicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
| | - Ikuko Kakizaki
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan Department of Glycobiomedicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
| | - Shinichiro Suto
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan Department of Glycobiomedicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
| | - Haruna Ishioka
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan Department of Glycobiomedicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
| | - Mika Negishi
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan Department of Glycobiomedicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
| | - Masahiko Endo
- Department of Glycobiomedicine, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
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Krishnan A, Li X, Kao WWY, Viker K, Butters K, Masuoka H, Knudsen B, Gores G, Charlton M. Lumican, an extracellular matrix proteoglycan, is a novel requisite for hepatic fibrosis. J Transl Med 2012; 92:1712-25. [PMID: 23007134 PMCID: PMC3810270 DOI: 10.1038/labinvest.2012.121] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Lumican, an extracellular matrix proteoglycan was previously shown to be upregulated with increasing severity of nonalcoholic steatohepatitis (NASH). Although lumican is involved in collagen fibrillogenesis in extra-hepatic tissues, little is known about the role of lumican in hepatic disease. We therefore determined lumican expression in etiologies other than clinical NASH. Our results indicated that lumican is upregulated in clinical samples of hepatitis C virus infection, in experimental rodent models of chronic and acute liver injury and could additionally be induced in vitro in response to the pro-fibrotic cytokine transforming growth factor β1 (TGFβ1) and to lipotoxic palmitic acid. Together, these results suggested a role for lumican in hepatic fibrosis. To investigate the functional role of lumican in hepatic fibrosis, lumican null (Null) and wild-type (WT) littermates were administered carbon tetrachloride intra-peritoneally. Serum and liver tissue were analyzed for indices of liver injury, fibrosis, matrix turnover, and proliferation. Hepatic fibrosis was greatly reduced in null animals (P<0.05). Paradoxically, gene expression of fibrosis-related genes such as TGFβ1 and collagen 1 was numerically higher in null animals though statistically insignificant from WT animals. On the other hand, α smooth muscle actin expression (α-SMA), a marker for activated fibroblasts, the main contributors of collagen production was significantly higher (P<0.05) in null animals as compared with WT littermates. Among the matrix metalloproteases (MMP), MMP13 was significantly increased (P<0.05) in null animals. Ultra-structural imaging indicated differences in the organization and spatial distribution of hepatic collagen fibrils of null and WT mice. Cell proliferation was significantly increased (P<0.05) in null animals. We conclude that lumican is a prerequisite for hepatic fibrosis. The protective effect of lumican deficiency in hepatic fibrosis appears to be downstream of collagen production and mediated through the combined effects of impaired collagen fibrillogenesis, increased matrix turnover, and an enhanced proliferative response.
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Affiliation(s)
- Anuradha Krishnan
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Xia Li
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | | | - Kimberly Viker
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Kim Butters
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Howard Masuoka
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Bruce Knudsen
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Gregory Gores
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Michael Charlton
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
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21
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Coleman RM, Aguilera L, Quinones L, Lukashova L, Poirier C, Boskey A. Comparison of bone tissue properties in mouse models with collagenous and non-collagenous genetic mutations using FTIRI. Bone 2012; 51:920-8. [PMID: 22910579 PMCID: PMC3583571 DOI: 10.1016/j.bone.2012.08.110] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 08/02/2012] [Accepted: 08/04/2012] [Indexed: 12/18/2022]
Abstract
Understanding how the material properties of bone tissue from the various forms of osteogenesis imperfecta (OI) differ will allow us to tailor treatment regimens for affected patients. To this end, we characterized the bone structure and material properties of two mouse models of OI, the osteogenesis imperfecta mouse (oim/oim) and fragilitas ossium (fro/fro), in which bone fragility is due to a genetic defect in collagen type I and a defect in osteoblast matrix mineralization, respectively. Bones from 3 to 6 month old animals were examined using Fourier transform infrared spectroscopic imaging (FTIRI), microcomputed tomography (micro-CT), histology, and biochemical analysis. The attributes of oim/oim bone tissue were relatively constant over time when compared to wild type animals. The mineral density in oim/oim cortices and trabecular bone was higher than wild type while the bones had thinner cortices and fewer trabeculae that were thinner and more widely spaced. The fro/fro animals exhibited osteopenic attributes at 3 months. However, by 6 months, their spectroscopic and geometric properties were similar to wild type animals. Despite the lack of a specific collagen defect in fro/fro mice, both fro/fro and oim/oim genotypes exhibited abnormal collagen crosslinking as determined by FTIRI at both time points. These results demonstrate that abnormal extracellular matrix assembly plays a role in the bone fragility in both of these models.
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Affiliation(s)
- Rhima M. Coleman
- Hospital for Special Surgery, Cornell University-Weill Medical College, New York, NY, USA
| | - Laura Aguilera
- LaGuardia Community College of the City University of New York, New York, NY, USA
| | - Layla Quinones
- LaGuardia Community College of the City University of New York, New York, NY, USA
| | - Lyudamila Lukashova
- Hospital for Special Surgery, Cornell University-Weill Medical College, New York, NY, USA
| | | | - Adele Boskey
- Hospital for Special Surgery, Cornell University-Weill Medical College, New York, NY, USA
- Corresponding author at: Hospital for Special Surgery, Caspary Research Building, 535 E. 70th Street, New York, NY 10021, USA. Fax: + 1 212 472 5331. , (A. Boskey)
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22
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Yang CH, Culshaw GJ, Liu MM, Lu CC, French AT, Clements DN, Corcoran BM. Canine tissue-specific expression of multiple small leucine rich proteoglycans. Vet J 2012; 193:374-80. [PMID: 22365843 DOI: 10.1016/j.tvjl.2012.01.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 01/10/2012] [Accepted: 01/18/2012] [Indexed: 11/16/2022]
Abstract
Small leucine rich proteoglycans (SLRPs) are important constituents of extracellular matrix (ECM) and contribute to the production, organization and remodelling of collagen and elastin through complex biological systems. The relative expression and distribution of SLRPs in a variety of different mammalian tissues is poorly characterized. The aim of this study was to map the expression of seven SLRPs (biglycan, versican, prolargin, fibromodulin, osteoglycin, decorin and lumican) in seven tissues (bone, cartilage, cruciate ligament, skin, ventricular myocardium, mitral valve and cornea) in young adult dogs using a combination of quantitative real-time PCR, immunohistochemistry and protein immunoblotting. Clear and consistent patterns of SLRP expression and distribution were identified for the seven tissues examined, with the greatest SLRP expression in cartilage, skin, cornea and mitral valve, and the least expression in myocardium. In general, lumican and prolargin had the greatest expression across the seven tissues whilst osteoglycin was the least abundantly expressed SLRP. These data provide a SLRP profile for different canine tissues which can inform future studies of SLRP expression in development and disease.
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Affiliation(s)
- C-H Yang
- Royal (Dick) School of Veterinary Studies, The Roslin Institute, Easter Bush Veterinary Centre, Roslin, Mid-Lothian EH25 9RG, Scotland, UK
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23
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Self-assembled matrix by umbilical cord stem cells. J Funct Biomater 2011; 2:213-29. [PMID: 24956304 PMCID: PMC4030936 DOI: 10.3390/jfb2030213] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 08/23/2011] [Accepted: 08/25/2011] [Indexed: 01/08/2023] Open
Abstract
Corneal integrity is critical for vision. Corneal wounds frequently heal with scarring that impairs vision. Recently, human umbilical cord mesenchymal stem cells (cord stem cells) have been investigated for tissue engineering and therapy due to their availability and differentiation potential. In this study, we used cord stem cells in a 3-dimensional (3D) stroma-like model to observe extracellular matrix organization, with human corneal fibroblasts acting as a control. For 4 weeks, the cells were stimulated with a stable Vitamin C (VitC) derivative ±TGF-β1. After 4 weeks, the mean thickness of the constructs was ∼30 μm; however, cord stem cell constructs had 50% less cells per unit volume, indicating the formation of a dense matrix. We found minimal change in decorin and lumican mRNA, and a significant increase in perlecan mRNA in the presence of TGF-β1. Keratocan on the other hand decreased with TGF-β1 in both cell lineages. With both cell types, the constructs possessed aligned collagen fibrils and associated glycosaminoglycans. Fibril diameters did not change with TGF-β1 stimulation or cell lineage; however, highly sulfated glycosaminoglycans associated with the collagen fibrils significantly increased with TGF-β1. Overall, we have shown that cord stem cells can secrete their own extracellular matrix and promote the deposition and sulfation of various proteoglycans. Furthermore, these cells are at least comparable to commonly used corneal fibroblasts and present an alternative for the 3D in vitro tissue engineered model.
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24
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Structure of corneal layers, collagen fibrils, and proteoglycans of tree shrew cornea. Mol Vis 2011; 17:2283-91. [PMID: 21921979 PMCID: PMC3171502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Accepted: 08/19/2011] [Indexed: 11/30/2022] Open
Abstract
PURPOSE The stroma is the major part of the cornea, in which collagen fibrils and proteoglycans are distributed uniformly. We describe the ultrastructure of corneal layers, collagen fibrils (CF), and proteoglycans (PGs) in the tree shrew cornea. METHODS Tree shrew corneas (5, 6, and 10 week old animals) and normal human corneas (24, 25, and 54 years old) were fixed in 2.5% glutaraldehyde containing cuprolinic blue in a sodium acetate buffer. The tissue was processed for electron microscopy. The 'iTEM Olympus Soft Imaging Solutions GmbH' program was used to measure the corneal layers, collagen fibril diameters and proteoglycan areas. RESULTS The tree shrew cornea consists of 5 layers: the epithelium, Bowman's layer, stroma, Descemet's membrane, and endothelium. The epithelium was composed of squamous cells, wing cells and basal cells. The Bowman's layer was 5.5±1.0 µm thick and very similar to a normal human Bowman's layer. The stroma was 258±7.00 µm thick and consisted of collagen fibril lamellae. The lamellae were interlaced with one another in the anterior stroma, but ran parallel to one another in the middle and posterior stroma. Collagen fibrils were decorated with proteoglycan filaments with an area size of 390 ±438 nm(2). The collagen fibril had a minimum diameter of 39±4.25 nm. The interfibrillar spacing was 52.91±6.07 nm. Within the collagen fibrils, very small electron-dense particles were present. CONCLUSIONS The structure of the tree shrew cornea is very similar to that of the normal human cornea. As is the case with the human cornea, the tree shrew cornea had a Bowman's layer, lamellar interlacing in the anterior stroma and electron-dense particles within the collagen fibrils. The similarities of the tree shrew cornea with the human cornea suggest that it could be a good structural model to use when studying changes in collagen fibrils and proteoglycans in non-genetic corneal diseases, such as ectasia caused after LASIK (laser-assisted in situ keratomileusis).
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Lu P, Zhang GR, Song XH, Zou XH, Wang LL, Ouyang HW. Col V siRNA engineered tenocytes for tendon tissue engineering. PLoS One 2011; 6:e21154. [PMID: 21713001 PMCID: PMC3119690 DOI: 10.1371/journal.pone.0021154] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2010] [Accepted: 05/20/2011] [Indexed: 11/18/2022] Open
Abstract
The presence of uniformly small collagen fibrils in tendon repair is believed to play a major role in suboptimal tendon healing. Collagen V is significantly elevated in healing tendons and plays an important role in fibrillogenesis. The objective of this study was to investigate the effect of a particular chain of collagen V on the fibrillogenesis of Sprague-Dawley rat tenocytes, as well as the efficacy of Col V siRNA engineered tenocytes for tendon tissue engineering. RNA interference gene therapy and a scaffold free tissue engineered tendon model were employed. The results showed that scaffold free tissue engineered tendon had tissue-specific tendon structure. Down regulation of collagen V α1 or α2 chains by siRNAs (Col5α1 siRNA, Col5α2 siRNA) had different effects on collagen I and decorin gene expressions. Col5α1 siRNA treated tenocytes had smaller collagen fibrils with abnormal morphology; while those Col5α2 siRNA treated tenocytes had the same morphology as normal tenocytes. Furthermore, it was found that tendons formed by coculture of Col5α1 siRNA treated tenocytes with normal tenocytes at a proper ratio had larger collagen fibrils and relative normal contour. Conclusively, it was demonstrated that Col V siRNA engineered tenocytes improved tendon tissue regeneration. And an optimal level of collagen V is vital in regulating collagen fibrillogenesis. This may provide a basis for future development of novel cellular- and molecular biology-based therapeutics for tendon diseases.
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Affiliation(s)
- Ping Lu
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China
- Institute of Cell Biology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Guo Rong Zhang
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China
| | - Xing Hui Song
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China
- Institute of Cell Biology, School of Medicine, Zhejiang University, Hangzhou, China
| | - Xiao Hui Zou
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China
- Women Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Lin Lin Wang
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China
- Institute of Cell Biology, School of Medicine, Zhejiang University, Hangzhou, China
- * E-mail: (LLW); (HWO)
| | - Hong Wei Ouyang
- Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China
- Institute of Cell Biology, School of Medicine, Zhejiang University, Hangzhou, China
- * E-mail: (LLW); (HWO)
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26
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Parfitt GJ, Pinali C, Akama TO, Young RD, Nishida K, Quantock AJ, Knupp C. Electron tomography reveals multiple self-association of chondroitin sulphate/dermatan sulphate proteoglycans in Chst5-null mouse corneas. J Struct Biol 2011; 174:536-41. [PMID: 21440637 DOI: 10.1016/j.jsb.2011.03.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 03/14/2011] [Accepted: 03/20/2011] [Indexed: 11/28/2022]
Abstract
The spatial distribution of collagen fibrils in the corneal stroma is essential for corneal transparency and is primarily regulated by extrafibrillar proteoglycans, which are multi-functional polymers that interact with hybrid type I/V collagen fibrils. In order to understand more about proteoglycan organisation and collagen associations in the cornea, three-dimensional electron microscopy reconstructions of collagen-proteoglycan interactions in the anterior, mid and posterior stroma from a Chst5 knockout mouse, which lacks a keratan sulphate sulphotransferase, were obtained. Both longitudinal and transverse section show sinuous, oversized proteoglycans with near-periodic, orthogonal off-shoots. In many cases, these proteoglycans traverse over 400nm of interfibrillar space interconnecting over 10 collagen fibrils. The reconstructions suggest that multiple chondroitin sulphate/dermatan sulphate proteoglycans have aggregated laterally and, possibly, end-to-end, with orthogonal extensions protruding from the main electron-dense stained filament. We suggest possible mechanisms as to how sulphation differences may lead to this increase in aggregation of proteoglycans in the Chst5-null mouse corneal stroma and how this relates to proteoglycan packing in healthy corneas.
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Affiliation(s)
- Geraint J Parfitt
- Structural Biophysics Group, School of Optometry and Vision Sciences, Cardiff University, Wales, UK.
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27
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Orgel JPRO, San Antonio JD, Antipova O. Molecular and structural mapping of collagen fibril interactions. Connect Tissue Res 2011; 52:2-17. [PMID: 21182410 DOI: 10.3109/03008207.2010.511353] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The fibrous collagens form the structural basis of all mammalian connective tissues, including the vasculature, dermis, bones, tendons, cartilage, and those tissues that support organs such as the heart, kidneys, liver, and lungs. The helical structure of collagen has been extensively studied but in addition to its helical character, its molecular packing arrangement (in its aggregated or fibrillar form) and the presence of specific amino acid sequences govern collagen's in vivo functions. Collagen's molecular packing arrangement helps control cellular communication, attachment and movement, and conveys its tissue-specific biomechanical properties. Recent progress in understanding collagen's molecular packing, fibrillar structure, domain organization, and extracellular matrix (ECM) interactions in light of X-ray fiber diffraction data provides significant new insights into how the ECM is organized and functions. In this review, the hierarchy of fibrillar collagen structure is discussed in the context of how this organization affects ECM-"ligand" interactions, with specific attention to collagenolysis, integrins, fibronection, glycoprotein VI receptor (GPVI), and proteoglycans (PG). Understanding the complex structure of collagen and its attached ligands should provide new insights into tissue growth, development, regeneration, and disease.
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Affiliation(s)
- J P R O Orgel
- Pritzker Institute of Biomedical Science and Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA.
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28
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Ren R, Hong Z, Gong H, Laporte K, Skinner M, Seldin DC, Costello CE, Connors LH, Trinkaus-Randall V. Role of glycosaminoglycan sulfation in the formation of immunoglobulin light chain amyloid oligomers and fibrils. J Biol Chem 2010; 285:37672-82. [PMID: 20870723 DOI: 10.1074/jbc.m110.149575] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Primary amyloidosis (AL) results from overproduction of unstable monoclonal immunoglobulin light chains (LCs) and the deposition of insoluble fibrils in tissues, leading to fatal organ disease. Glycosaminoglycans (GAGs) are associated with AL fibrils and have been successfully targeted in the treatment of other forms of amyloidosis. We investigated the role of GAGs in LC fibrillogenesis. Ex vivo tissue amyloid fibrils were extracted and examined for structure and associated GAGs. The GAGs were detected along the length of the fibril strand, and the periodicity of heparan sulfate (HS) along the LC fibrils generated in vitro was similar to that of the ex vivo fibrils. To examine the role of sulfated GAGs on AL oligomer and fibril formation in vitro, a κ1 LC purified from urine of a patient with AL amyloidosis was incubated in the presence or absence of GAGs. The fibrils generated in vitro at physiologic concentration, temperature, and pH shared morphologic characteristics with the ex vivo κ1 amyloid fibrils. The presence of HS and over-O-sulfated-heparin enhanced the formation of oligomers and fibrils with HS promoting the most rapid transition. In contrast, GAGs did not enhance fibril formation of a non-amyloidogenic κ1 LC purified from urine of a patient with multiple myeloma. The data indicate that the characteristics of the full-length κ1 amyloidogenic LC, containing post-translational modifications, possess key elements that influence interactions of the LC with HS. These findings highlight the importance of the variable and constant LC regions in GAG interaction and suggest potential therapeutic targets for treatment.
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Affiliation(s)
- Ruiyi Ren
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts 02118, USA
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29
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Akhtar S, Bron AJ, Hayes AJ, Meek KM, Caterson B. Role of keratan sulphate (sulphated poly -N-acetyllactosamine repeats) in keratoconic cornea, histochemical, and ultrastructural analysis. Graefes Arch Clin Exp Ophthalmol 2010; 249:413-20. [PMID: 20853116 DOI: 10.1007/s00417-010-1512-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2010] [Revised: 08/30/2010] [Accepted: 09/01/2010] [Indexed: 11/26/2022] Open
Abstract
AIMS Keratan sulphate (KS) is the predominant glycosaminoglycan (GAG) present in the corneal stroma where it is thought to regulate collagen fibril diameter. In this study we investigated the distribution of KS in normal and keratoconic corneas. METHODS Four normal, one mild, and four severe keratoconic corneas were used for the study. Distribution of keratan sulphate proteoglycans (KS-PG) was investigated using a primary monoclonal antibody (5-D-4) that recognizes disulphated disaccharides in the poly-N-acetyllactosamine repeats of KS. The immuno-reactivity of 5-D-4 was analyzed by immunohistochemistry and immuno-electron microscopy. RESULTS Immuno-histochemistry showed diffuse 5-D-4 staining in keratoconic cornea compared to the punctuate staining in normal corneas. In the single cornea with mild keratoconus, immunogold microscopy revealed a very high density of KS-PG staining, especially in the posterior stroma, compared to severe keratoconic and normal cornea. The amount of KS-PG in the stroma in severe keratoconus was slightly less compared to the normal cornea. In the mild keratoconic cornea, a higher quantity of KS-PG was present around the keratocytes. In severe keratoconic corneas, a higher quantity of KS-PG was present within the keratocytes compared to normal cornea. CONCLUSIONS The finding of an altered expression of KS in our keratoconic corneas, in particular the strong expression of KS in keratocytes, is in keeping with reports of an altered expression of proteoglycan metabolism in keratoconus. KS-PG plays an important role in stromal collagen fibril assembly and a dysregulation of KS-PG synthesis or catabolism could explain changes in collagen fibril spacing and diameter, which we have reported elsewhere.
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Affiliation(s)
- S Akhtar
- Department of Optometry, College of Applied Medical Sciences, King Saud University, PO Box 10219, Riyadh, 11433, Saudi Arabia.
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30
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Three-dimensional reconstruction of collagen–proteoglycan interactions in the mouse corneal stroma by electron tomography. J Struct Biol 2010; 170:392-7. [DOI: 10.1016/j.jsb.2010.01.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 01/28/2010] [Accepted: 01/28/2010] [Indexed: 11/21/2022]
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31
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Antipova O, Orgel JPRO. In situ D-periodic molecular structure of type II collagen. J Biol Chem 2010; 285:7087-96. [PMID: 20056598 DOI: 10.1074/jbc.m109.060400] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Collagens are essential components of extracellular matrices in multicellular animals. Fibrillar type II collagen is the most prominent component of articular cartilage and other cartilage-like tissues such as notochord. Its in situ macromolecular and packing structures have not been fully characterized, but an understanding of these attributes may help reveal mechanisms of tissue assembly and degradation (as in osteo- and rheumatoid arthritis). In some tissues such as lamprey notochord, the collagen fibrillar organization is naturally crystalline and may be studied by x-ray diffraction. We used diffraction data from native and derivative notochord tissue samples to solve the axial, D-periodic structure of type II collagen via multiple isomorphous replacement. The electron density maps and heavy atom data revealed the conformation of the nonhelical telopeptides and the overall D-periodic structure of collagen type II in native tissues, data that were further supported by structure prediction and transmission electron microscopy. These results help to explain the observed differences in collagen type I and type II fibrillar architecture and indicate the collagen type II cross-link organization, which is crucial for fibrillogenesis. Transmission electron microscopy data show the close relationship between lamprey and mammalian collagen fibrils, even though the respective larger scale tissue architecture differs.
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Affiliation(s)
- Olga Antipova
- Center for Molecular Study of Condensed Soft Matter Centers (microCoSM), Pritzker Institute of Biomedical Science and Engineering, Chicago, Illinois 60616, USA.
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32
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Paderi JE, Sistiabudi R, Ivanisevic A, Panitch A. Collagen-binding peptidoglycans: a biomimetic approach to modulate collagen fibrillogenesis for tissue engineering applications. Tissue Eng Part A 2009; 15:2991-9. [PMID: 19323607 DOI: 10.1089/ten.tea.2009.0014] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The small leucine-rich proteoglycans (SLRPs), prevalent in collagenous tissues, regulate collagen fibrillogenesis and provide a host of biochemical cues critical to tissue function and homeostasis. Incorporating SLRPs may enhance tissue engineering designs that mimic the native extracellular matrix, although SLRPs purified from animal sources bear low yields and lack design control. Consequently, we have designed synthetic peptidoglycans, inspired by the native SLRP decorin, that contain a collagen-binding peptide attached to a glycosaminoglycan (GAG) chain. These peptidoglycans modulate collagen fibrillogenesis and decrease fibril diameter in vitro, similarly to decorin, while maintaining the characteristic D-banded fibrils. Application for tissue engineering is demonstrated as these peptidoglycans are incorporated into collagen gels seeded with smooth muscle cells. Gels formed with peptidoglycans and decorin show a faster rate of gel compaction, and one peptidoglycan uniquely increases elastin production. The peptidoglycan design can be tailored with respect to the peptide sequence and GAG identity and is expected to have versatile application in tissue engineering.
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Affiliation(s)
- John E Paderi
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
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33
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Ren R, Hutcheon AEK, Guo XQ, Saeidi N, Melotti SA, Ruberti JW, Zieske JD, Trinkaus-Randall V. Human primary corneal fibroblasts synthesize and deposit proteoglycans in long-term 3-D cultures. Dev Dyn 2008; 237:2705-15. [PMID: 18624285 DOI: 10.1002/dvdy.21606] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Our goal was to develop a 3-D multi-cellular construct using primary human corneal fibroblasts cultured on a disorganized collagen substrate in a scaffold-free environment and to use it to determine the regulation of proteoglycans over an extended period of time (11 weeks). Electron micrographs revealed multi-layered constructs with cells present in between alternating parallel and perpendicular arrays of fibrils. Type I collagen increased 2-4-fold. Stromal proteoglycans including lumican, syndecan4, decorin, biglycan, mimecan, and perlecan were expressed. The presence of glycosaminoglycan chains was demonstrated for a subset of the core proteins (lumican, biglycan, and decorin) using lyase digestion. Cuprolinic blue-stained cultures showed that sulfated proteoglycans were present throughout the construct and most prominent in its mid-region. The size of the Cuprolinic-positive filaments resembled those previously reported in a human corneal stroma. Under the current culture conditions, the cells mimic a development or nonfibrotic repair phenotype.
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Affiliation(s)
- R Ren
- Departments of Biochemistry and Ophthalmology, Boston University School of Medicine, Boston, Massachusetts 02118, USA
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34
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Paderi JE, Panitch A. Design of a Synthetic Collagen-Binding Peptidoglycan that Modulates Collagen Fibrillogenesis. Biomacromolecules 2008; 9:2562-6. [PMID: 18680341 DOI: 10.1021/bm8006852] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John E. Paderi
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907
| | - Alyssa Panitch
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907
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35
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Raspanti M, Viola M, Forlino A, Tenni R, Gruppi C, Tira ME. Glycosaminoglycans show a specific periodic interaction with type I collagen fibrils. J Struct Biol 2008; 164:134-9. [PMID: 18664384 DOI: 10.1016/j.jsb.2008.07.001] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2008] [Revised: 06/30/2008] [Accepted: 07/03/2008] [Indexed: 11/28/2022]
Abstract
Current wisdom on intermolecular interactions in the extracellular matrix assumes that small proteoglycans bind collagen fibrils on highly specific sites via their protein core, while their carbohydrate chains interact with each other in the interfibrillar space. The present study used high-resolution scanning electron microscopy to analyse the interaction of two small leucine-rich proteoglycans and several glycosaminoglycan chains with type I collagen fibrils obtained in vitro in a controlled, cell-free environment. Our results show that most ligands directly influence the collagen fibril size and shape, and their aggregation into thicker bundles. All chondroitin sulphate/dermatan sulphate glycosaminoglycans we tested, except chondroitin 4-sulphate, bound to the fibril surface in a highly specific way and, even in the absence of any protein core, formed regular, periodic interfibrillar links resembling those of the intact proteoglycan. Only intact decorin, however, was able to organize collagen fibrils into fibres compact enough to mimic in vitro the superfibrillar organization of natural tissues. Our data indicate that multiple interaction patterns may exist in vivo, may explain why decorin- or biglycan-knockout organisms show milder effects than can be expected, and may lead to the development of better, simpler engineered biomaterials.
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Affiliation(s)
- Mario Raspanti
- Department of Human Anatomy, Insubria University, Varese, Italy.
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36
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HUNZELMANN N, ANDERS S, SOLLBERG S, SCHÖNHERR E, KRIEG T. Co-ordinate induction of collagen type I and biglycan expression in keloids. Br J Dermatol 2008. [DOI: 10.1046/j.1365-2133.1996.d01-1011.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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37
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Mayo C, Ren R, Rich C, Stepp MA, Trinkaus-Randall V. Regulation by P2X7: epithelial migration and stromal organization in the cornea. Invest Ophthalmol Vis Sci 2008; 49:4384-91. [PMID: 18502993 DOI: 10.1167/iovs.08-1688] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Previously, the authors demonstrated that BzATP, a P2X(7) receptor agonist, enhanced corneal epithelial migration in vitro. The goal here was to characterize the role of the P2X(7) receptor in the repair of in vivo corneal epithelial debridement wounds and in the structural organization of the corneal stroma. METHODS Epithelial debridement was performed on P2X(7) knockout (P2X(7)(-/-)) and wild-type (WT) mice, and eyes were harvested after 16 hours. Corneas were stained with Richardson vital stain, and the wound area was recorded. Corneas were fixed and prepared for light microscopic, immunohistochemical, and electron microscopic analysis. Cuprolinic blue staining was performed to analyze stromal proteoglycans (PGs). Real-time PCR was performed to examine the expression of stromal collagens. RESULTS P2X(7) was present in the WT corneal epithelium but was not detected in P2X(7)(-/-) mice. Pannexin-1, a protein demonstrated to interact with P2X(7), was absent from the wound edge in P2X(7)(-/-). This was associated with a trend toward delayed corneal reepithelialization. Stromal ultrastructure and collagen alignment were altered in P2X(7)(-/-), and collagen fibrils had smaller diameters with a larger interfibrillar distances. Expression of collagen alpha1(I) and alpha3(v) was reduced. There were 30% fewer sulfated PGs along fibrils in the P2X(7)(-/-) stroma. CONCLUSIONS In the absence of the P2X(7) receptor, the expression of proteins in the corneal epithelium was altered and wound healing was compromised. Loss of receptor resulted in morphologic changes in the stroma, including changes in alignment of collagen fibrils, decreased expression of collagen, and smaller fibrils with fewer PGs per fibril.
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Affiliation(s)
- Courtney Mayo
- Departments of Biochemistry, Boston University School of Medicine, Boston, Massachusetts 02118, USA
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Immunofluorescence Confocal Microscopy of Porcine Corneas Following Collagen Cross-linking Treatment With Riboflavin and Ultraviolet A. J Refract Surg 2008; 24:S715-9. [DOI: 10.3928/1081597x-20080901-14] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Matteini P, Rossi F, Menabuoni L, Pini R. Microscopic characterization of collagen modifications induced by low-temperature diode-laser welding of corneal tissue. Lasers Surg Med 2007; 39:597-604. [PMID: 17868101 DOI: 10.1002/lsm.20532] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND AND OBJECTIVE Laser welding of corneal tissue that employs diode lasers (810 nm) at low power densities (12-20 W/cm(2)) in association with Indocyanine Green staining of the wound is a technique proposed as an alternative to conventional suturing procedures. The aim of this study is to evaluate, by means of light (LM) and transmission electron microscopy (TEM) analyses, the structural modifications induced in laser-welded corneal stroma. MATERIALS AND METHODS Experiments were carried out in 20 freshly enucleated pig eyes. A 3.5 mm in length full-thickness cut was produced in the cornea, and was then closed by laser welding. Birefringence modifications in samples stained with picrosirius red dye were analyzed by polarized LM to assess heat damage. TEM analysis was performed on ultra-thin slices, contrasted with uranyl acetate and lead citrate, in order to assess organization and size of type I collagen fibrils after laser welding. RESULTS LM evidenced bridges of collagen bundles between the wound edges, with a loss of regular lamellar organization at the welded site. Polarized LM indicated that birefringence properties were mostly preserved after laser treatment. TEM examinations revealed the presence of quasi-ordered groups of fibrils across the wound edges preserving their interfibrillar spacing. These fibrils appeared morphologically comparable to those in the control tissue, indicating that type I collagen was not denatured during the diode laser corneal welding. CONCLUSIONS The preservation of substantially intact, undenatured collagen fibrils in laser-welded corneal wounds supported the thermodynamic studies that we carried out recently, which indicated temperatures below 66 degrees C at the weld site under laser irradiation. This observation enabled us to hypothesize that the mechanism, proposed in the literature, of unwinding of collagen triple helixes followed by fibrils "interdigitation" is not likely to occur in the welding process that we set up for the corneal suturing.
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Affiliation(s)
- Paolo Matteini
- Consiglio Nazionale delle Ricerche, Istituto di Fisica Applicata Nello Carrara, Sesto Fiorentino, Italy
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Viola M, Bartolini B, Sonaggere M, Giudici C, Tenni R, Tira ME. Fibromodulin interactions with type I and II collagens. Connect Tissue Res 2007; 48:141-8. [PMID: 17522997 DOI: 10.1080/03008200701276133] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Fibromodulin is a keratan-sulfate small leucine-rich proteoglycan (SLRP) regulating collagen I and II fibril formation. In vivo studies suggest that, alongside decorin, fibromodulin plays an important role in the maintenance of mature tissues. To characterize fibromodulin/decorin differences in binding to type I and II collagen, we tested the collagen CNBr peptides in solid-phase assays. Only one peptide from collagen II and several peptides from collagen I interacted with fibromodulin, pointing to multiple binding sites in the collagen I molecule. By Scatchard-type analysis, the fibromodulin molecule showed only one class of binding sites for collagen I and both low and high affinity (classes of) binding sites for collagen II. Lys/Hyl residues in both collagens are essential for the interaction. Fibril formation assays showed the concomitant presence of fibromodulin and decorin in fibrils and a cumulative inhibitory effect. In solid-phase assays decorin seems to inhibit fibromodulin binding, whereas the contrary does not occur. We found fibromodulin and decorin have similarities and differences that may represent the biochemical basis of redundancy in SLRP function with compensation between different (classes of) SLRPs.
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Affiliation(s)
- Manuela Viola
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche, Università dell'Insubria. Varese. Italy.
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Young RD, Akama TO, Liskova P, Ebenezer ND, Allan B, Kerr B, Caterson B, Fukuda MN, Quantock AJ. Differential immunogold localisation of sulphated and unsulphated keratan sulphate proteoglycans in normal and macular dystrophy cornea using sulphation motif-specific antibodies. Histochem Cell Biol 2006; 127:115-20. [PMID: 16944190 DOI: 10.1007/s00418-006-0228-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/24/2006] [Indexed: 11/26/2022]
Abstract
Keratan sulphate (KS) proteoglycans (PGs) are key molecules in the corneal stroma for tissue organisation and transparency. Macular corneal dystrophy (MCD) is a rare, autosomal recessive disease characterised by disturbances in KS expression. MCD is caused by mutations in CHST6, a gene encoding the enzyme responsible for KS sulphation. Sulphated KS is absent in type I disease causing corneal opacity and loss of vision. Genetic studies have highlighted the mutational heterogeneity in MCD, but supportive immunohistochemical studies on corneal KS have previously been limited by the availability of antibodies mostly reactive only with highly sulphated KS epitopes. In this study, we employed four antibodies against specific KS sulphation patterns, including one against unsulphated KS, to investigate their reactivity in a case of MCD compared with normal cornea using high-resolution immunogold electron microscopy. Mutation analysis indicated type I MCD with deletion of the entire open reading frame of CHST6. Contrast enhanced fixation revealed larger PG structures in MCD than normal. Unlike normal cornea, MCD cornea showed positive labelling with antibody to unsulphated KSPG, but was negative with antibodies to sulphated KSPG. These antibodies will thus facilitate high-resolution investigations of phenotypic heterogeneity in support of genetic studies in this disease.
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Affiliation(s)
- Robert D Young
- Structural Biophysics Group, School of Optometry & Vision Sciences, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff, CF10 3NB Wales, UK
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Scott JE, Stockwell RA. Cartilage elasticity resides in shape module decoran and aggrecan sumps of damping fluid: implications in osteoarthrosis. J Physiol 2006; 574:643-50. [PMID: 16581860 PMCID: PMC1817741 DOI: 10.1113/jphysiol.2006.108100] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2006] [Accepted: 03/27/2006] [Indexed: 01/01/2023] Open
Abstract
Cartilage ultrastructure is based on collagen fibrils tied together by proteoglycans (PGs). Interfibrillar orthogonal PG bridges ('shape modules') were located by electron histochemistry using Cupromeronic blue methodology. Their frequency and size, similar to those in tendon, cornea, etc., were compatible with biochemical estimates of tissue decoran (formerly decorin), the PG component of shape module bridges. Digestion by hyaluronanase and chondroitinase AC helped to identify aggrecan and decoran and exemplified the destruction of shape modular organization by glycan-splitting agents. The anionic glycosaminoglycan (AGAG) of decoran, dermochondan sulphate (DS, formerly dermatan sulphate), contains L-iduronate, an elastic sugar unit. Chondroitan, keratan (present in aggrecan) and hyaluronan are not similarly elastic but can participate in sliding-filament reversible deformability. Mechanical properties predicted for the interfibrillar bridges accord with anisotropic stress/strain responses of articular cartilage to compressive or tensile stresses. We propose that fluid from pericellular aggrecan-rich domains moves under pressure into the interterritorial fibrillar arrays against the elastic resistance of the shape modules, which return the fluid, post-compression, to its original position. Cartilage is tendon-like, with the addition of expansile aggrecan-rich reservoirs of aqueous shock absorber fluid. Rupture or loss of interfibrillar ties would allow expansile PG to force the collagenous matrix apart, imbibing water, increasing swelling and fissuring--characteristic manifestations of osteoarthrosis (OA), a joint disease of major economic importance. Decoran may be a primary target of the OA disease process.
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Affiliation(s)
- John E Scott
- Chemical Morphology, Medical School, University of Manchester, Oxford Road, Manchester M13 9PT, UK.
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Milan AM, Sugars RV, Embery G, Waddington RJ. Adsorption and interactions of dentine phosphoprotein with hydroxyapatite and collagen. Eur J Oral Sci 2006; 114:223-31. [PMID: 16776772 DOI: 10.1111/j.1600-0722.2006.00347.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dentine phosphoprotein (DPP) has been proposed to both promote and inhibit mineral deposition during dentinogenesis. The present study aimed to investigate the molecular interactions of DPP and dephosphorylated DPP (DPP-p) with hydroxyapatite (HAP). Bovine DPP was purified and dephosphorylated by alkaline phosphatase to obtain DPP-p. DPP and DPP-p adsorption to HAP was determined along with their ability, when free in solution or bound to collagen, to influence HAP-induced crystal growth. Absorption isotherms suggested that lower DPP concentrations (1.5-6.25 microg ml(-1)) demonstrated a reduced affinity for HAP compared with higher protein concentrations (12.5-50.0 microg ml(-1)). Dephosphorylated DPP had a much reduced affinity for HAP compared with DPP. Dentine phosphoprotein inhibited seeded HAP crystal growth, in a dose-dependent manner, whilst removal of the phosphate groups reduced this inhibition. When bound to collagen fibrils, DPP significantly promoted the rate of HAP crystal growth over 0-8 min. Conversely, DPP-p and collagen significantly decreased the rate of crystal growth over 0-18 min. These results indicate a major role for the phosphate groups present on DPP in HAP crystal growth. In addition, concentration-dependent conformational changes to DPP, and the interaction with other matrix components, such as collagen, are important in predicting its dual role in the mineralization of dentine.
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Affiliation(s)
- Anna M Milan
- Department of Clinical Dental Sciences, The University of Liverpool, Liverpool, UK
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Corrêa ADC, Azevedo LM, Almeida GLD, Cuzzi T, Takiya CM. Decorina e Condroitim sulfato na remodelação da matriz extracelular do línquen escleroso vulvar. An Bras Dermatol 2005. [DOI: 10.1590/s0365-05962005001000008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
FUNDAMENTOS: O líquen escleroso (LS) apresenta zona de hialinização do colágeno na derme superior característica, que persiste pouco definida do ponto de vista morfológico e cujo significado permanece sem explicação. Já se pôde demonstrar que no LS há profundas modificações da matriz extracelular (MEC), com acúmulo de proteínas colagênicas e de glicosaminoglicanos sulfatados na região hialina. OBJETIVOS: Caracterizar morfologicamente a presença nessa zona de decorina e condroitim sulfato que, ao interagir com as fibrilas colágenas, entre outras proteínas matriciais, poderiam contribuir para essa peculiar apresentação da MEC. MÉTODOS: 31 casos de LS vulvar foram subdivididos segundo a gradação histológica de Hewitt e analisados por imuno-histoquímica utilizando anticorpos contra decorina e condroitim sulfato revelados pela diaminobenzidina. Esses resultados foram comparados aos do grupo controle constituído por fragmentos de retalhos cutâneos excisados durante cirurgias corretivas da região vulvoperineal. RESULTADOS: Ocorreu predomínio da decorina quando a matriz apresentava um aspecto frouxo/edematoso, e o condroitim sulfato foi mais evidente quando a MEC assumia um padrão compacto, parecendo que ambos contribuem para o aspecto hialino, porém em fases diferentes da patogenia dessa doença. CONCLUSÕES: A seqüência observada na síntese desses proteoglicanos/glicosaminoglicanos levou à suposição de que a decorina seja um possível marcador precoce do LS vulvar e de que o condroitim sulfato possa estar relacionado à contenção da alteração matricial no nível da derme média.
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Takashi M, Tsubaki S, Tsuzuki T, Duarte WR, Yamauchi M, Sato H. Differential gene expression of collagen-binding small leucine-rich proteoglycans and lysyl hydroxylases, during mineralization by MC3T3-E1 cells cultured on titanium implant material. Eur J Oral Sci 2005; 113:225-31. [PMID: 15953247 DOI: 10.1111/j.1600-0722.2005.00208.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Titanium implants create a unique ultrastructure (composed of a collagenous zone with relatively disorganized fibril morphology) at the bone-implant interface. The objective of this study was to investigate the temporal mRNA expression patterns, using real-time polymerase chain reaction, of type I collagen (COLI) and regulators for collagen fibrillogenesis, collagen-binding small leucine-rich proteoglycans (SLRPs) and lysyl hydroxylases (LHs), during mineralization, by MC3T3-E1 cells cultured on titanium (Ti). Lysates of the cultures on Ti and on plastic wells (Pl) for 10-50 d were used for the quantification of calcium and mRNA. Although the onset of calcium accumulation in the cultures on Ti (30-40 d) was slower than that of cultures on Pl (20-30 d), the gene expression patterns during mineralization were similar in cells cultured on either material. COLI and fibromodulin were up-regulated just before the onset of mineralization and then down-regulated. Lumican and LH1 were up-regulated just before the onset of mineralization and then returned to the baseline level. Decorin and LH2 were up-regulated at the late mineralization stage. Biglycan was down-regulated once at the early mineralization stage and then returned to the original level. LH3 was maintained at a steady level throughout. This study suggests actual but distinct roles of SLRPs and LHs in the formation of a unique ultrastructure at the bone-implant interface.
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Affiliation(s)
- Matsuura Takashi
- Department of Oral Rehabilitation, Fukuoka Dental College, Tamura 2-15-1, Sawara-ku, Fukuoka 814-0193, Japan.
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Stoeckelhuber M, Brueckner S, Spohr G, Welsch U. Proteoglycans and collagen in the intervertebral disc of the rhesus monkey (Macaca mulatta). Ann Anat 2005; 187:35-42. [PMID: 15835398 DOI: 10.1016/j.aanat.2004.08.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The different varieties of supportive tissues in the intervertebral discs of the rhesus monkeys (Macaca mulatta) were investigated with regard to morphology of the collagen fibrils and distribution and localization of proteoglycans (PG). The annulus fibrosus and the nucleus pulposus of the intervertebral disc were structurally closely integrated into the cartilaginous endplates of the vertebral bodies. The collagen fibrils in the intervertebral disc fell into two categories; i.e. thick (70-110 nm) and thin (40-50 nm) ones. In the outer zone of the annulus fibrosus only thick fibrils occurred, while in the regions of the inner part of the annulus fibrosus, in the periphery of the nucleus pulposus and in the cartilaginous endplates both types of fibrils were found. PG were found free in the matrix and in great numbers in association with collagen fibrils in all regions of the intervertebral disc. They interconnected neighbouring fibrils and decorated the surface of the collagen fibrils in irregular orientation. Only the thick fibrils of the annulus fibrosus contained small regularly arranged intrafibrillar PG precipitates. The free precipitates were usually longer and thicker than the collagen-associated PG, in addition they could be branched. Since rhesus monkeys are closely related to humans, they can serve as model organisms and the findings presented may be of relevance to the understanding of the human intervertebral discs.
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Affiliation(s)
- Mechthild Stoeckelhuber
- Department of Anatomy, Ludwig-Maximilians-University of Munich, Pettenkoferstrasse 11, 80336 Munich, Germany.
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Abstract
Immunofluorescence and immunogold techniques were used to determine the presence and distribution of aquaporin-1 (AQP1) within the rat uterus. Uterine tissue from non-pregnant (proestrus) as well as pregnant (days 1, 3, 6 and 7) rats were used. It was found that this water channel was present in the myometrium of the pregnant rat uterus with the intensity of AQP1 immunoreactivity increasing from day 1 to day 6 of pregnancy. In particular, an increase was also observed in mesometrial as compared to antimesometrial myometrium. Immunolocalization at the electron microscope level indicated that AQP1 was localized to the plasma membrane of smooth muscle cells found within the inner circular layer. It is suggested that AQP1 plays a role in stromal oedema, uterine closure and orientation of the blastocyst.
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Affiliation(s)
- Laura A Lindsay
- Department of Anatomy and Histology, The University of Sydney, NSW, Australia
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Abstract
The cornea has evolved to fulfil the dual functions of enclosing and protecting the inner contents of the eye, and focussing light onto the retina with minimum scatter and optical degradation. It does this by means of the arrangement of the constituent collagen fibrils, an arrangement that is unique in connective tissues. This article reviews our current knowledge about the detailed organization of collagen in the corneal stroma, and presents new data suggesting that a significant proportion of collagen fibrils running across the cornea, change direction near the limbus and fuse with the circumferential limbal collagen.
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Affiliation(s)
- Keith M Meek
- Structural Biophysics Group, Department of Optometry and Vision Sciences, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF10 3NB, UK.
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