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Abhithaj J, Sharanya CS, Arun KG, Jayadevi Variyar E, Sadasivan C. Trypsin is inhibited by phytocompounds liquiritin and terpinen-4-ol from the herb Glycyrrhiza glabra: in vitro and in silico studies. J Biomol Struct Dyn 2024; 42:2957-2964. [PMID: 37184119 DOI: 10.1080/07391102.2023.2212784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 04/27/2023] [Indexed: 05/16/2023]
Abstract
Serine proteases are a class of hydrolytic enzymes involved in various physiological functions like digestion, coagulation, fibrinolysis and immunity. The present study evaluates the serine protease inhibitory potential of phytochemicals liquiritin and terpinen-4-ol present in the herb Glycyrrhiza glabra L. using trypsin as the model enzyme. In silico studies showed that both the compounds have a significant binding affinity towards trypsin with a binding energy of -26.66 kcal/mol and -19.79 kcal/mol for liquiritin and terpinen-4-ol, respectively. Their binding affinity was confirmed through in vitro enzyme inhibition assays. The mode of inhibition was found to be uncompetitive. In order to explain the mode of inhibition, docking of the ligands to the enzyme-substrate complex was also done and binding energy was calculated after MD simulation. The energy values showed that the binding affinities of these compounds towards the enzyme substrate complex are more than that towards the enzyme alone. This explains the uncompetitive mode of inhibition.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- J Abhithaj
- Department of Biotechnology & Microbiology and Inter University Centre for Bioscience, Kannur University, Kannur, Kerala, India
| | - C S Sharanya
- Department of Biosciences, Rajagiri College of Social Sciences (Autonomous), Cochin, Kerala, India
| | - K G Arun
- Department of Biotechnology & Microbiology and Inter University Centre for Bioscience, Kannur University, Kannur, Kerala, India
| | - E Jayadevi Variyar
- Department of Biotechnology & Microbiology and Inter University Centre for Bioscience, Kannur University, Kannur, Kerala, India
| | - C Sadasivan
- Department of Biotechnology & Microbiology and Inter University Centre for Bioscience, Kannur University, Kannur, Kerala, India
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2
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Wan L, Cheng X, Searleman AC, Ma YJ, Wong JH, Meyer RS, Du J, Tang G, Chang EY. Evaluation of enzymatic proteoglycan loss and collagen degradation in human articular cartilage using ultrashort echo time-based biomarkers: A feasibility study. NMR Biomed 2022; 35:e4664. [PMID: 34904305 PMCID: PMC9042587 DOI: 10.1002/nbm.4664] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 11/19/2021] [Accepted: 11/20/2021] [Indexed: 05/02/2023]
Abstract
The objective of the current study was to investigate the feasibility of quantitative 3D ultrashort echo time (UTE)-based biomarkers in detecting proteoglycan (PG) loss and collagen degradation in human cartilage. A total of 104 cartilage samples were harvested for a trypsin digestion study (n = 44), and a sequential trypsin and collagenase digestion study (n = 60), respectively. Forty-four cartilage samples were randomly divided into a trypsin digestion group (tryp group) and a control group (phosphate-buffered saline [PBS] group) (n = 22 for each group) for the trypsin digestion experiment. The remaining 60 cartilage samples were divided equally into four groups (n = 15 for each group) for sequential trypsin and collagenase digestion, including PBS + Tris (incubated in PBS, then Tris buffer solution), PBS + 30 U col (incubated in PBS, then 30 U/ml collagenase [30 U col] with Tris buffer solution), tryp + 30 U col (incubated in trypsin solution, then 30 U/ml collagenase with Tris buffer solution), and tryp + Tris (incubated in trypsin solution, then Tris buffer solution). The 3D UTE-based MRI biomarkers included T1 , multiecho T2 *, adiabatic T1ρ (AdiabT1ρ ), magnetization transfer ratio (MTR), and modeling of macromolecular proton fraction (MMF). For each cartilage sample, UTE-based biomarkers (T1 , T2 *, AdiabT1ρ , MTR, and MMF) and sample weight were evaluated before and after treatment. PG and hydroxyproline assays were performed. Differences between groups and correlations were assessed. All the evaluated biomarkers were able to differentiate between healthy and degenerated cartilage in the trypsin digestion experiment, but only T1 and AdiabT1ρ were significantly correlated with the PG concentration in the digestion solution (p = 0.004 and p = 0.0001, respectively). In the sequential digestion experiment, no significant differences were found for T1 and AdiabT1ρ values between the PBS + Tris and PBS + 30 U col groups (p = 0.627 and p = 0.877, respectively), but T1 and AdiabT1ρ values increased significantly in the tryp + Tris (p = 0.031 and p = 0.024, respectively) and tryp + 30 U col groups (both p < 0.0001). Significant decreases in MMF and MTR were found in the tryp + 30 U col group compared with the PBS + Tris group (p = 0.002 and p = 0.001, respectively). It was concluded that AdiabT1ρ and T1 have the potential for detecting PG loss, while MMF and MTR are promising for the detection of collagen degradation in articular cartilage, which could facilitate earlier, noninvasive diagnosis of osteoarthritis.
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Affiliation(s)
- Lidi Wan
- Department of Radiology, University of California, San Diego, CA
- Department of Radiology, Tenth People’s Hospital of Tongji University, Shanghai, China
| | - Xin Cheng
- Department of Radiology, University of California, San Diego, CA
- Division of Histology and Embryology, Jinan University, Guangzhou, China
| | | | - Ya-Jun Ma
- Department of Radiology, University of California, San Diego, CA
| | - Jonathan H. Wong
- Department of Radiology, University of California, San Diego, CA
- Radiology Service, VA San Diego Healthcare System, San Diego, CA
| | - R. Scott Meyer
- Orthopaedic Surgery Service, VA San Diego Healthcare System, San Diego, CA
| | - Jiang Du
- Department of Radiology, University of California, San Diego, CA
| | - Guangyu Tang
- Department of Radiology, Tenth People’s Hospital of Tongji University, Shanghai, China
| | - Eric Y. Chang
- Department of Radiology, University of California, San Diego, CA
- Radiology Service, VA San Diego Healthcare System, San Diego, CA
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Ledwoń P, Papini AM, Rovero P, Latajka R. Peptides and Peptidomimetics as Inhibitors of Enzymes Involved in Fibrillar Collagen Degradation. Materials (Basel) 2021; 14:3217. [PMID: 34200889 DOI: 10.3390/ma14123217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 05/28/2021] [Accepted: 06/07/2021] [Indexed: 12/20/2022]
Abstract
Collagen fibres degradation is a complex process involving a variety of enzymes. Fibrillar collagens, namely type I, II, and III, are the most widely spread collagens in human body, e.g., they are responsible for tissue fibrillar structure and skin elasticity. Nevertheless, the hyperactivity of fibrotic process and collagen accumulation results with joints, bone, heart, lungs, kidneys or liver fibroses. Per contra, dysfunctional collagen turnover and its increased degradation leads to wound healing disruption, skin photoaging, and loss of firmness and elasticity. In this review we described the main enzymes participating in collagen degradation pathway, paying particular attention to enzymes degrading fibrillar collagen. Therefore, collagenases (MMP-1, -8, and -13), elastases, and cathepsins, together with their peptide and peptidomimetic inhibitors, are reviewed. This information, related to the design and synthesis of new inhibitors based on peptide structure, can be relevant for future research in the fields of chemistry, biology, medicine, and cosmeceuticals.
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Hafner T, Schock J, Post M, Abrar DB, Sewerin P, Linka K, Knobe M, Kuhl C, Truhn D, Nebelung S. A serial multiparametric quantitative magnetic resonance imaging study to assess proteoglycan depletion of human articular cartilage and its effects on functionality. Sci Rep 2020; 10:15106. [PMID: 32934341 PMCID: PMC7492285 DOI: 10.1038/s41598-020-72208-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 08/21/2020] [Indexed: 02/06/2023] Open
Abstract
Water, collagen, and proteoglycans determine articular cartilage functionality. If altered, susceptibility to premature degeneration is increased. This study investigated the effects of enzymatic proteoglycan depletion on cartilage functionality as assessed by advanced Magnetic Resonance Imaging (MRI) techniques under standardized loading. Lateral femoral condylar cartilage-bone samples from patients undergoing knee replacement (n = 29) were serially imaged by Proton Density-weighted and T1, T1ρ, T2, and T2* mapping sequences on a clinical 3.0 T MRI scanner (Achieva, Philips). Using pressure-controlled indentation loading, samples were imaged unloaded and quasi-statically loaded to 15.1 N and 28.6 N, and both before and after exposure to low-concentrated (LT, 0.1 mg/mL, n = 10) or high-concentrated trypsin (HT, 1.0 mg/mL, n = 10). Controls were not treated (n = 9). Responses to loading were assessed for the entire sample and regionally, i.e. sub- and peri-pistonally, and zonally, i.e. upper and lower sample halves. Trypsin effects were quantified as relative changes (Δ), analysed using appropriate statistical tests, and referenced histologically. Histological proteoglycan depletion was reflected by significant sub-pistonal decreases in T1 (p = 0.003) and T2 (p = 0.008) after HT exposure. Loading-induced changes in T1ρ and T2* were not related. In conclusion, proteoglycan depletion alters cartilage functionality and may be assessed using serial T1 and T2 mapping under loading.
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Affiliation(s)
- Tobias Hafner
- Department of Diagnostic and Interventional Radiology, Aachen University Hospital, Aachen, Germany
| | - Justus Schock
- Medical Faculty, Department of Diagnostic and Interventional Radiology, University Hospital Düsseldorf, Moorenstraße 5, 40225, Dusseldorf, Germany.,Institute of Computer Vision and Imaging, RWTH University Aachen, Aachen, Germany
| | - Manuel Post
- Department of Diagnostic and Interventional Radiology, Aachen University Hospital, Aachen, Germany
| | - Daniel Benjamin Abrar
- Medical Faculty, Department of Diagnostic and Interventional Radiology, University Hospital Düsseldorf, Moorenstraße 5, 40225, Dusseldorf, Germany
| | - Philipp Sewerin
- Medical Faculty, Department and Hiller-Research-Unit for Rheumatology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Kevin Linka
- Department of Continuum and Materials Mechanics, Hamburg University of Technology, Hamburg, Germany
| | - Matthias Knobe
- Clinic for Orthopaedic and Trauma Surgery, Cantonal Hospital Luzern, Luzern, Switzerland
| | - Christiane Kuhl
- Department of Diagnostic and Interventional Radiology, Aachen University Hospital, Aachen, Germany
| | - Daniel Truhn
- Department of Diagnostic and Interventional Radiology, Aachen University Hospital, Aachen, Germany
| | - Sven Nebelung
- Medical Faculty, Department of Diagnostic and Interventional Radiology, University Hospital Düsseldorf, Moorenstraße 5, 40225, Dusseldorf, Germany.
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Liebesny PH, Mroszczyk K, Zlotnick H, Hung HH, Frank E, Kurz B, Zanotto G, Frisbie D, Grodzinsky AJ. Enzyme Pretreatment plus Locally Delivered HB-IGF-1 Stimulate Integrative Cartilage Repair In Vitro. Tissue Eng Part A 2019; 25:1191-1201. [PMID: 31237484 PMCID: PMC6760182 DOI: 10.1089/ten.tea.2019.0013] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 04/10/2019] [Indexed: 01/20/2023] Open
Abstract
IMPACT STATEMENT A critical attribute for the long-term success of cartilage defect repair is the strong integration between the repair tissue and the surrounding native tissue. Current approaches utilized by physicians fail to achieve this attribute, leading to eventual relapse of the defect. This article demonstrates the concept of a simple, clinically viable approach for enhancing tissue integration via the combination of a safe, transient enzymatic treatment with a locally delivered, retained growth factor through an in vitro hydrogel/cartilage explant model.
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Affiliation(s)
- Paul H. Liebesny
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Keri Mroszczyk
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Hannah Zlotnick
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Han-Hwa Hung
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Eliot Frank
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Bodo Kurz
- Anatomical Institute, University of Kiel, Kiel, Germany
| | - Gustavo Zanotto
- Department of Clinical Sciences, Orthopaedic Research Center, Colorado State University, Fort Collins, Colorado
| | - David Frisbie
- Department of Clinical Sciences, Orthopaedic Research Center, Colorado State University, Fort Collins, Colorado
| | - Alan J. Grodzinsky
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts
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6
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Mei L, Lin C, Lei S, Xu L, Fan YS. Small Peptides Compound Isolated from Agkistrodon with Antiarthritic Effect in Collagen-Induced Arthritis Rats. Evid Based Complement Alternat Med 2018; 2018:8265150. [PMID: 29853972 PMCID: PMC5949182 DOI: 10.1155/2018/8265150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 02/28/2018] [Accepted: 03/22/2018] [Indexed: 11/24/2022]
Abstract
Agkistrodon in Chinese medicine has long been used as an effective treatment against rheumatoid arthritis (RA). The present research further investigated the effects of peptides extracted from the crude Agkistrodon on the RA rat model. Extracted peptides were separated by parameter-optimized ion-exchange chromatography (IEC), peptide fractions were further analysed by MALDI-TOF/TOF MS, and nano-LC-MS/MS acquired mass spectra were further characterized using Mascot software, which ranks the best matches in the NCBI database. RT-PCR results in RAW264.7 cells indicated that Agkistrodon peptide components had inhibitory effects against inflammatory cytokines. The therapeutic efficacy of Agkistrodon peptides was evaluated on the Wistar rats with collagen-induced arthritis. Symptom relief and reduced cartilage destruction and bone erosion were observed, which can be explained by the direct suppression of inflammatory cytokines in the joints. Agkistrodon peptides downregulate the expression of TNF-α, IL-1β, and IL-6, which may alleviate cartilage destruction and bone erosion, thus relieving symptoms of RA.
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Affiliation(s)
- Lijun Mei
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, China
| | - Chen Lin
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, China
| | - Shanshan Lei
- Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Li Xu
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, China
| | - Yong-Sheng Fan
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, China
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Delgado LM, Shologu N, Fuller K, Zeugolis DI. Acetic acid and pepsin result in high yield, high purity and low macrophage response collagen for biomedical applications. ACTA ACUST UNITED AC 2017; 12:065009. [PMID: 28767045 DOI: 10.1088/1748-605x/aa838d] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Collagen based devices are frequently associated with foreign body response. Although several pre- (e.g. species, state of animal, tissue) and post- (e.g. cross-linking, scaffold architecture) extraction method factors have a profound effect on foreign body response, little is known about which and how during the extraction process factors mediate foreign body response. In this study, we assessed the influence of acetic acid and hydrochloric acid and the utilisation or not of pepsin or salt precipitation during collagen extraction on the yield, purity, free amines, denaturation temperature, resistance to collagenase degradation and macrophage response. Acetic acid/pepsin extracted collagen exhibited the highest yield, purity and free amine content and the lowest denaturation temperature. No differences in resistance to collagenase digestion were detected between the groups. Although all treatments exhibited similar macrophage morphology comprised of round cells (M1 phenotype), elongated cells (M2 phenotype) and cell aggregates (foreign body response), significantly more elongated cells were observed on HC films. Although no differences in metabolic activity were observed between the groups, the DNA concentration was significantly lower for the hydrochloric acid treatments. Further, cytokine analysis revealed that hydrochloric acid treatments induced significantly higher IL-1β and TNF-α release with respect to acetic acid treatments. Salt precipitation did not influence the parameters assessed. Collectively, these data suggest that during the collagen extraction process variables should also be monitored as, evidently, they affect the physicochemical and biological properties of collagen preparations.
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Affiliation(s)
- Luis M Delgado
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland. Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
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Barati D, Kader S, Pajoum Shariati SR, Moeinzadeh S, Sawyer RH, Jabbari E. Synthesis and Characterization of Photo-Cross-Linkable Keratin Hydrogels for Stem Cell Encapsulation. Biomacromolecules 2017; 18:398-412. [DOI: 10.1021/acs.biomac.6b01493] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Danial Barati
- Biomimetic Materials and Tissue Engineering Laboratory, Department
of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Biological
Sciences, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Safaa Kader
- Biomimetic Materials and Tissue Engineering Laboratory, Department
of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Biological
Sciences, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Seyed Ramin Pajoum Shariati
- Biomimetic Materials and Tissue Engineering Laboratory, Department
of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Biological
Sciences, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Seyedsina Moeinzadeh
- Biomimetic Materials and Tissue Engineering Laboratory, Department
of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Biological
Sciences, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Roger H. Sawyer
- Biomimetic Materials and Tissue Engineering Laboratory, Department
of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Biological
Sciences, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Esmaiel Jabbari
- Biomimetic Materials and Tissue Engineering Laboratory, Department
of Chemical Engineering, ‡Department of Chemistry and Biochemistry, and §Department of Biological
Sciences, University of South Carolina, Columbia, South Carolina 29208, United States
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Zhang Q, Filas BA, Roth R, Heuser J, Ma N, Sharma S, Panitch A, Beebe DC, Shui YB. Preservation of the structure of enzymatically-degraded bovine vitreous using synthetic proteoglycan mimics. Invest Ophthalmol Vis Sci 2014; 55:8153-62. [PMID: 25342623 DOI: 10.1167/iovs.14-14366] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
PURPOSE Vitreous liquefaction and subsequent posterior vitreous detachment can lead to several sight-threatening diseases, including retinal detachment, macular hole and macular traction syndrome, nuclear cataracts, and possibly, open-angle glaucoma. In this study, we tested the ability of three novel synthetic chondroitin sulfate proteoglycan mimics to preserve the structure and physical properties of enzymatically-degraded bovine vitreous. METHODS Chondroitin sulfate proteoglycan mimics, designed to bind to type II collagen, hyaluronic acid, or both, were applied to trypsin- or collagenase-treated bovine vitreous in situ and in vitro. Rheology and liquefaction tests were performed to determine the physical properties of the vitreous, while Western blots were used to detect the presence and degradation of soluble collagen II (α1). Deep-etch electron microscopy (DEEM) identified the ultrastructure of mimic-treated and untreated enzyme-degraded bovine vitreous. RESULTS Proteoglycan mimics preserved the physical properties of trypsin-degraded bovine vitreous and protected against vitreous liquefaction. Although the collagen-binding mimic maintained the physical properties of collagenase-treated vitreous, liquefaction still occurred. Western blots indicated that the mimic provided only marginal protective ability against soluble collagen degradation. Deep-etch electron microscopy, however, showed increased density and isotropy of microstructural components in mimic-treated vitreous, supporting the initial result that vitreous structure was preserved. CONCLUSIONS Proteoglycan mimics preserved bovine vitreous physical properties after enzymatic degradation. These compounds may be useful in delaying or preventing the pathological effects of age-related, or enzymatically-induced, degradation of the vitreous body.
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Affiliation(s)
- Qianru Zhang
- Eye Center, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China Department of Ophthalmology & Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Benjamen A Filas
- Department of Ophthalmology & Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Robyn Roth
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, United States
| | - John Heuser
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Nan Ma
- Department of Ophthalmology & Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, United States Department of Ophthalmology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Shaili Sharma
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States
| | - Alyssa Panitch
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States
| | - David C Beebe
- Department of Ophthalmology & Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, United States Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Ying-Bo Shui
- Department of Ophthalmology & Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, United States
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Miao P, Wang B, Han K, Tang Y. Electrochemical impedance spectroscopy study of proteolysis using unmodified gold nanoparticles. Electrochem commun 2014; 47:21-4. [DOI: 10.1016/j.elecom.2014.07.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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11
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Rössler E, Mattea C, Stapf S. NMR dispersion investigations of enzymatically degraded bovine articular cartilage. Magn Reson Med 2014; 73:2005-14. [PMID: 24824480 DOI: 10.1002/mrm.25292] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 04/02/2014] [Accepted: 04/24/2014] [Indexed: 11/07/2022]
Abstract
PURPOSE Cross-relaxation of protons with (14) N nuclei in proteins enhances relaxivity in the quadrupolar dip range of typically 2-3 MHz Larmor frequency. The magnitude of these dips was suggested as a means of assessing the degeneracy of articular cartilage during osteoarthritis (OA). However, so far only proteoglycans have been considered whereas collagen nitrogen was neglected. This study addresses the relative importance of glycosaminoglycans (GAG), collagen, and water content for the cross-relaxation effect. METHODS Relaxation dispersion data were acquired for protons in samples of bovine articular cartilage, collagen, and GAG before and after the addition of trypsin or collagenase, and were compared with spatially resolved dGEMRIC experiments at 0.27 Tesla. RESULTS Both collagen as well as GAG show quadrupolar dips that strongly depend on hydration. For typical water concentrations in cartilage, the effect of enzymatic activity onto GAG is minor but a strong dependence on water concentration is found. CONCLUSION Quadrupolar dips in the (1) H relaxation dispersion of cartilage possess similar contributions from both GAG and collagen. The reduction of the cross-relaxation contribution observed in OA tissue is thus not directly proportional to GAG concentration, but maintains a collagen contribution and reflects predominantly the increase in water concentration during OA.
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Affiliation(s)
- Erik Rössler
- TU Ilmenau, Institute of Physics, Fachgebiet Technische Physik II, Ilmenau, Germany
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12
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Rojas FP, Batista MA, Lindburg CA, Dean D, Grodzinsky AJ, Ortiz C, Han L. Molecular adhesion between cartilage extracellular matrix macromolecules. Biomacromolecules 2014; 15:772-80. [PMID: 24491174 PMCID: PMC3983133 DOI: 10.1021/bm401611b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
![]()
In this study, we investigated the
molecular adhesion between the
major constituents of cartilage extracellular matrix, namely, the
highly negatively charged proteoglycan aggrecan and the type II/IX/XI
fibrillar collagen network, in simulated physiological conditions.
Colloidal force spectroscopy was applied to measure the maximum adhesion
force and total adhesion energy between aggrecan end-attached spherical
tips (end radius R ≈ 2.5 μm) and trypsin-treated
cartilage disks with undamaged collagen networks. Studies were carried
out in various aqueous solutions to reveal the physical factors that
govern aggrecan–collagen adhesion. Increasing both ionic strength
and [Ca2+] significantly increased adhesion, highlighting
the importance of electrostatic repulsion and Ca2+-mediated
ion bridging effects. In addition, we probed how partial enzymatic
degradation of the collagen network, which simulates osteoarthritic
conditions, affects the aggrecan–collagen interactions. Interestingly,
we found a significant increase in aggrecan–collagen adhesion
even when there were no detectable changes at the macro- or microscales.
It is hypothesized that the aggrecan–collagen adhesion, together
with aggrecan–aggrecan self-adhesion, works synergistically
to determine the local molecular deformability and energy dissipation
of the cartilage matrix, in turn, affecting its macroscopic tissue
properties.
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Affiliation(s)
- Fredrick P Rojas
- Departments of Materials Science and Engineering, §Mechanical Engineering, ∥Biological Engineering, and ⊥Electrical Engineering and Computer Science, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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13
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Byun S, Sinskey YL, Lu YC, Frank EH, Grodzinsky AJ. Transport and binding of tumor necrosis factor-α in articular cartilage depend on its quaternary structure. Arch Biochem Biophys 2013; 540:1-8. [PMID: 24135706 DOI: 10.1016/j.abb.2013.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 09/16/2013] [Accepted: 10/03/2013] [Indexed: 01/05/2023]
Abstract
The effect of tumor necrosis factor-α (TNFα) on cartilage matrix degradation is mediated by its transport and binding within the extracellular matrix (ECM) of the tissue, which mediates availability to cell receptors. Since the bioactive form of TNFα is a homotrimer of monomeric subunits, conversion between trimeric and monomeric forms during intratissue transport may affect binding to ECM and, thereby, bioactivity within cartilage. We studied the transport and binding of TNFα in cartilage, considering the quaternary structure of this cytokine. Competitive binding assays showed significant binding of TNFα in cartilage tissue, leading to an enhanced uptake. However, studies in which TNFα was cross-linked to remain in the trimeric form revealed that the binding of trimeric TNFα was negligible. Thus, binding of TNFα to ECM was associated with the monomeric form. Binding of TNFα was not disrupted by pre-treating cartilage tissue with trypsin, which removes proteoglycans and glycoproteins but leaves the collagen network intact. Therefore, proteoglycan loss during osteoarthritis should only alter the passive diffusion of TNFα but not its binding interaction with the remaining matrix. Our results suggest that matrix binding and trimer-monomer conversion of TNFα both play crucial roles in regulating the accessibility of bioactive TNFα within cartilage.
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van Deemter M, Kuijer R, Harm Pas H, Jacoba van der Worp R, Hooymans JMM, Los LI. Trypsin-mediated enzymatic degradation of type II collagen in the human vitreous. Mol Vis 2013; 19:1591-9. [PMID: 23882137 PMCID: PMC3718489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Accepted: 07/15/2013] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Aging of the vitreous body can result in sight-threatening pathology. One aspect of vitreous aging is liquefaction, which results from the vanishing of collagen fibrils. We investigated the possibility that trypsins are involved in vitreous type II collagen degradation. METHODS Immunohistochemistry and western blotting were used for detecting and locating trypsin isoforms in the vitreous and retina of human donor eyes. The capability of the retina to produce these trypsins was analyzed with polymerase chain reaction. Whether the different trypsins degraded type II collagen was tested in vitro. The sizes of the in vitro induced type II collagen degradation products were compared to those present in the vitreous of human eyes of different ages. RESULTS Trypsin-1 and trypsin-2 were detected in the vitreous. In the retina, messenger ribonucleic acid (mRNA) coding for trypsin-2, -3, and -4 was present. Using immunohistochemistry, trypsin-2 was detected in microglial cells located in the vitreous and the retina. All trypsin isoforms degraded type II collagen and produced degradation products of similar sizes as those present in the vitreous. CONCLUSIONS Trypsin-1 and trypsin-2 appear to have a function in the degradation of vitreous type II collagen. They could therefore have a role in the development of vitreous liquefaction.
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Affiliation(s)
- Mariëlle van Deemter
- Department of Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,W.J. Kolff institute, Graduate School of Medical Sciences, Groningen, The Netherlands
| | - Roel Kuijer
- Department of Biomedical Engineering, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,W.J. Kolff institute, Graduate School of Medical Sciences, Groningen, The Netherlands
| | - Hendri Harm Pas
- Department of Dermatology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Roelofje Jacoba van der Worp
- Department of Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,W.J. Kolff institute, Graduate School of Medical Sciences, Groningen, The Netherlands
| | - Johanna Martina Maria Hooymans
- Department of Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,W.J. Kolff institute, Graduate School of Medical Sciences, Groningen, The Netherlands
| | - Leonoor Inge Los
- Department of Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands,W.J. Kolff institute, Graduate School of Medical Sciences, Groningen, The Netherlands
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Mirigian LS, Makareeva E, Koistinen H, Itkonen O, Sorsa T, Stenman UH, Salo T, Leikin S. Collagen degradation by tumor-associated trypsins. Arch Biochem Biophys 2013; 535:111-4. [PMID: 23541862 DOI: 10.1016/j.abb.2013.03.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 03/18/2013] [Accepted: 03/19/2013] [Indexed: 10/27/2022]
Abstract
In normal soft tissues, collagen is degraded primarily by collagenases from the matrix metalloproteinase family. Yet, collagenase-like activity of tumor-associated isoforms of other enzymes might be involved in cancer invasion as well. In the present study, we systematically examined collagen degradation by non-sulfated isoforms of trypsins, which were proposed to possess such an activity. We found that non-sulfated trypsin-1, -2, and -3 were able to cleave non-helical and unfolded regions of collagen chains but not the intact triple helix, similar to sulfated trypsins produced by the pancreas. Trypsin-2 sulfation did not affect the cleavage rate either. An apparent triple helix cleavage by tumor-associated trypsin-2 reported earlier likely occurred after triple helix unfolding during sample denaturation for gel electrophoresis. Nevertheless, tumor-associated trypsins might be important for releasing collagen from fibers through telopeptide cleavage as well as for degrading unfolded collagen chains, e.g. after initial cleavage and destabilization of triple helices by collagenases.
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Affiliation(s)
- Lynn S Mirigian
- National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
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Kawaguchi K, Maruyama H, Hasunuma R, Kumazawa Y. Suppression of inflammatory responses after onset of collagen-induced arthritis in mice by oral administration of theCitrusflavanone naringin. Immunopharmacol Immunotoxicol 2011; 33:723-9. [DOI: 10.3109/08923973.2011.564186] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Lee JH, Kim GH. Evaluation of Antioxidant and Inhibitory Activities for Different Subclasses Flavonoids on Enzymes for Rheumatoid Arthritis. J Food Sci 2010; 75:H212-7. [DOI: 10.1111/j.1750-3841.2010.01755.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
This study led to the development of monoclonal antibodies and time-resolved immunofluorometric methods recognizing human trypsinogen-1 and -2, respectively. Using these methods in normal sera the concentration of trypsinogen-1 was found to be higher than that of trypsinogen-2. However, in acute pancreatitis the concentration of serum trypsinogen-2 was 50-fold higher than in controls, whereas the difference in trypsinogen-1 concentration was only 15-fold. Serum samples from patients who had undergone pancreatoduodenectomy contained trypsinogen-2, while trypsinogen-1 was detected in only one of nine samples. Furthermore, in human ovarian cyst fluids tumor-associated trypsinogen-2 (TAT-2) is the predominant isoenzyme and in mucinous cyst fluids the levels of TAT-2 were associated with malignancy. These results suggest that (i) trypsinogen-2 could be used as a diagnostic marker for acute pancreatitis, (ii) its expression is not restricted to the pancreas, and (iii) TAT could be involved in ovarian tumor dissemination and breakage of tissue barriers. In ion exchange chromatography, isoelectric variants of the trypsinogen isoenzymes were seen. Mass spectrometric analysis of these revealed that pancreatic trypsinogens are sulfated at tyrosine 154 (Tyr154), whereas TAT-2 from a colon carcinoma cell line is not. Tyr154 is located within the primary substrate binding pocket of trypsin. Thus, Tyr154 sulfation is likely to influence substrate binding. The previously known differences in charge and substrate binding between pancreatic and tumor-associated trypsinogens are suggested to be caused by sulfation of Tyr154 in pancreatic trypsinogens.
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Affiliation(s)
- Outi Itkonen
- Hospital District of Helsinki and Uusimaa - HUSLAB and Department of Clinical Chemistry, University of Helsinki, Helsinki, Finland.
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Maciejewska-Rodrigues H, Al-Shamisi M, Hemmatazad H, Ospelt C, Bouton MC, Jäger D, Cope AP, Charles P, Plant D, Distler JHW, Gay RE, Michel BA, Knuth A, Neidhart M, Gay S, Jüngel A. Functional autoantibodies against serpin E2 in rheumatoid arthritis. ACTA ACUST UNITED AC 2010; 62:93-104. [DOI: 10.1002/art.25038] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Lee JH, Zhou HY, Cho SY, Kim YS, Lee YS, Jeong CS. Anti-inflammatory mechanisms of apigenin: inhibition of cyclooxygenase-2 expression, adhesion of monocytes to human umbilical vein endothelial cells, and expression of cellular adhesion molecules. Arch Pharm Res 2007; 30:1318-27. [PMID: 18038911 DOI: 10.1007/BF02980273] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The aim of this study was to clarify the anti-inflammatory mechanism of apigenin. Apigenin inhibited the collagenase activity involved in rheumatoid arthritis (RA) and suppressed lipopolysaccharide (LPS)-induced nitric oxide (NO) production in a dose dependent manner in RAW 264.7 macrophage cells. Pretreatment with apigenin also attenuated LPS-induced cyclooxygenase-2 (COX-2) expression. In addition, apigenin profoundly reduced the tumor necrosis factor-alpha (TNF-alpha)-induced adhesion of monocytes to HUVEC monolayer. Apigenin significantly suppressed the TNF-alpha-stimulated upregulation of vascular cellular adhesion molecule-1 (VCAM-1)-, intracellular adhesion molecule-1 (ICAM-1)-, and E-selectin-mRNA to the basal levels. Taken together, these results suggest that apigenin has significant anti-inflammatory activity that involves blocking NO-mediated COX-2 expression and monocyte adherence. These results further suggest that apigenin may be useful for therapeutic management of inflammatory diseases.
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Sumantran VN, Kulkarni AA, Harsulkar A, Wele A, Koppikar SJ, Chandwaskar R, Gaire V, Dalvi M, Wagh UV. Hyaluronidase and collagenase inhibitory activities of the herbal formulation Triphala guggulu. J Biosci 2007; 32:755-61. [PMID: 17762148 DOI: 10.1007/s12038-007-0075-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Myrrh (guggulu) oleoresin from the Commiphora mukul tree is an important component of antiarthritic drugs in Ayurvedic medicine. Clinical data suggest that elevated levels of hyaluronidase and collagenase type 2 enzymes contribute significantly to cartilage degradation. Triphala guggulu (TG) is a guggulu-based formulation used for the treatment of arthritis. We assessed the chondroprotective potential of TG by examining its effects on the activities of pure hyaluronidase and collagenase type 2 enzymes. Triphala shodith guggulu (TSG), an intermediate in the production of TG, was also examined. A spectrophotometric method was used to assay Hyaluronidase activity, and to detect potential Hyaluronidase inhibitors. Aqueous and hydro-alcoholic extracts of TSG showed weak but dose-dependent inhibition of hyaluronidase activity. In contrast, the TG formulation was 50 times more potent than the TSG extract with respect to hyaluronidase inhibitory activity. A validated X-ray film-based assay was used to measure the gelatinase activity of pure collagenase type 2. Hydro-alcoholic extracts of the TG formulation were 4 times more potent than TSG with respect to collagenase inhibitory activity. Components of Triphala were also evaluated for their inhibitory activities on hyaluronidase and collagenase. This is the first report to show that the T2 component of Triphala (T.chebula) is a highly potent hyaluronidase and collagenase inhibitor. Thus, the TG formulation inhibits two major enzymes that can degrade cartilage matrix. Our study provides the first in vitro preclinical evidence of the chondroprotective properties of TG.
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Affiliation(s)
- Venil N Sumantran
- Interactive Research School for Health Affairs (IRSHA), Bhartiya Vidyapeeth Deemed University Medical College Campus, Dhankawadi, Pune 411 043, India.
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Abstract
PURPOSE To study the proteolytic phenomena contributing to the pathogenesis of keratoconus, corneal enzymes with potential to cleave fibrillar collagen were studied. METHODS Immunohistochemical labeling was undertaken of conventional and novel mammalian collagenases (MMP-1, -2, -8, -13, and -14) of the matrix metalloproteinase (MMP) family and other collagenolytic proteinases of the serine (human trypsin-2) and cysteine (cathepsin K) endoproteinase families. The results were analyzed using a semiquantitative scoring system. RESULTS Labeling of MMP-8 was moderate in healthy controls, but weak in keratoconus. Moderate MMP-2 and weak MMP-14 expressions were similar in controls and keratoconus. MMP-1 was slightly overexpressed in keratoconus. In contrast, MMP-13 was weak in controls compared to moderate in keratoconus and human trypsin-2 and cathepsin K were moderate in controls and strong in keratoconus. CONCLUSIONS The collagenolytic milieu of human cornea is more complex than expected. Mesenchymal isoform of MMP-8 (ie, collagenase-2) participates in normal tissue remodeling, which may be impaired in keratoconus. MMP-2 (gelatinase A with interstitial collagenase activity) and MMP-14 (membrane-type MMP type I with collagenolytic potential) seem to be constitutively expressed and probably play a role in normal corneal remodeling. The most prominent changes in keratoconic cornea were observed in collagenase MMP-13 (ie, collagenase-3), and particularly, in cathepsin K and human trypsin-2, which were strongly expressed in keratoconus suggesting a role in intra- and extracellular pathological collagen destruction, respectively. This may contribute to stromal thinning characteristic for keratoconus.
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Ma GF, Ali A, Verzijl N, Hanemaaijer R, TeKoppele J, Konttinen YT, Salo J. Increased collagen degradation around loosened total hip replacement implants. ACTA ACUST UNITED AC 2006; 54:2928-33. [PMID: 16948130 DOI: 10.1002/art.22064] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To assess collagen degradation and its relationship to some of the key collagenolytic proteinases in the aggressive synovial membrane-like interface tissue around aseptically loosened hip replacement implants. METHODS The medical indication for the primary total hip replacement was osteoarthritis in all study patients. Samples from the study patients were compared with control synovial membranes obtained from trauma (hip fracture) patients. Proteoglycans were extracted with 4M guanidinium chloride. Denatured collagen in the remaining matrix was solubilized with alpha-chymotrypsin. Nonsoluble matrix and supernatant fractions were acid hydrolyzed before measurement of hydroxyproline. The proportion of soluble (in vivo-degraded) collagen of the total sample collagen content was calculated. Proteinases were stained using the avidin-biotin-peroxidase complex method. RESULTS Collagen in the interface membrane from the implants was highly degraded (mean +/- SEM 20 +/- 3%) compared with that in the control synovial membranes (12 +/- 1%; P = 0.007). In controls, the degree of collagen degradation did not correlate with levels of matrix metalloproteinase 1 (MMP-1), MMP-13, or cathepsin K, although MMP-1 approached statistical significance. In interface membranes, the correlations were r = 0.88 (P = 0.002), r = 0.92 (P = 0.001), and r = 0.98 (P < 0.0001) for MMP-1, MMP-13, and cathepsin K, respectively. CONCLUSION In normal synovial membrane, collagen matrix remodeling may be mainly an intracellular process. In contrast, pathologic tissue destruction in the interface membrane from prosthetic hip joints is associated with a shift toward MMP-13 and cathepsin K, which become activated and overcome their endogenous inhibitors (tissue inhibitors of metalloproteinases and cystatin C). The highly significant correlation between collagen degradation and cathepsin K indicates an extracellular role of this acidic endoproteinase, consistent with previous observations concerning the acidity of the interface membrane.
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Affiliation(s)
- Guo-Feng Ma
- Helsinki University Central Hospital, Helsinki, Finland
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Sorsa T, Tjäderhane L, Konttinen YT, Lauhio A, Salo T, Lee HM, Golub LM, Brown DL, Mäntylä P. Matrix metalloproteinases: contribution to pathogenesis, diagnosis and treatment of periodontal inflammation. Ann Med 2006; 38:306-21. [PMID: 16938801 DOI: 10.1080/07853890600800103] [Citation(s) in RCA: 464] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Matrix metalloproteinases (MMPs) form a family of enzymes that mediate multiple functions both in the tissue destruction and immune responses related to periodontal inflammation. The expression and activity of MMPs in non-inflamed periodontium is low but is drastically enhanced to pathologically elevated levels due to the dental plaque and infection-induced periodontal inflammation. Soft and hard tissue destruction during periodontitis and peri-implantitis are thought to reflect a cascade of events involving bacterial virulence factors/enzymes, pro-inflammatory cytokines, reactive oxygen species and MMPs. However, recent studies suggest that MMPs can also exert anti-inflammatory effects in defence of the host by processing anti-inflammatory cytokines and chemokines, as well as by regulating apoptotic and immune responses. MMP-inhibitor (MMPI)-drugs, such as doxycycline, can be used as adjunctive medication to augment both the scaling and root planing-treatment of periodontitis locally and to reduce inflammation systematically. Furthermore, MMPs present in oral fluids (gingival crevicular fluid (GCF), peri-implant sulcular fluid (PISF), mouth-rinses and saliva) can be utilized to develop new non-invasive, chair/bed-side, point-of-care diagnostics for periodontitis and dental peri-implantitis.
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Affiliation(s)
- Timo Sorsa
- Department of Oral and Maxillofacial Diseases, Helsinki University Central Hospital (HUCH), Institute of Dentistry, University of Helsinki, Helsinki, Finland.
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