scholarly journals Matrix metalloproteinases (MMP-1, -8, -13) in chronic periapical lesions

2008 ◽  
Vol 65 (12) ◽  
pp. 882-886 ◽  
Author(s):  
Biljana Andonovska ◽  
Cena Dimova ◽  
Saso Panov
Keyword(s):  
Matrix Metalloproteinases ◽  
Proteolytic Enzymes ◽  
High Concentration ◽  
Collagenase Activity ◽  
X Ray ◽  
Periapical Lesions ◽  
Membrane Components ◽  
Almost All ◽  
Basement Membrane Components

Background/Aim. Matrix metalloproteinases (MMPs) are proteolytic enzymes capable of degrading almost all extracellular matrix and basement membrane components in many destructive pathological processes, such as chronic inflammation and bone-destructive lesions. The aim of this study was to determinate the correlation between concentration of collagenases (MMP-1, -8, -13) in chronic periapical lesions and their dimension calculated with software predilection through X-ray. Metods. Chronic periapical tissues were collected by periapical surgery from 60 teeth with clinically and radiographically verified different chronic periapical lesions (20 granulomas, 20 diffuse periapical lesions, 10 cysts). Ten normal pulps used as controls were obtained by extirpation of the pulp of impacted third molars after their surgery. For rapid analysis of MMP-1, -8, -13 collagenase activities in the examined material Chemicon Collagenase Activity Assay Kit were used. From the X-ray trough software predilection (Image Tool3 Program) of the volume of chronic periapical tissue, correlation between concentration of MMPs in the periapical lesions and their dimension was confirmed. Results. Different concentrations of collagenases (MMP-1, -8 and -13) in chronic periapical process from different inflammation types showed different activity of MMPs. The obtained results showed the highest values of collagenases concentration (MMP-1, -8, -13) in chronic diffuse lesions (5.39 ng/ml). Low values of concentration of MMPs accompanied less serious lesions, whereas chronical periapical lesions of large dimension had high concentration of MMPs, which was proportional to progression of the lesion and destruction of bone tissue. Conclusions. This study confirmed the destructive role of collagenases (MMP-1, -8 and -13) in inflammation process, which directly depends on the concentration of MMPs in pathologically changed tissue.

Potential Role of Hyaluronic Acid on Bone in Osteoarthritis: Matrix Metalloproteinases, Aggrecanases, and RANKL Expression are Partially Prevented by Hyaluronic Acid in Interleukin 1-stimulated Osteoblasts

2014 ◽  
Vol 41 (5) ◽  
pp. 945-954 ◽  
Author(s):  
Zvezdana Mladenovic ◽  
Anne-Sophie Saurel ◽  
Francis Berenbaum ◽  
Claire Jacques
Keyword(s):  
Hyaluronic Acid ◽  
Matrix Metalloproteinases ◽  
Potential Role ◽  
Proteolytic Enzymes ◽  
Interleukin 1 ◽  
Nuclear Factor Κb ◽  
Mrna Levels ◽  
Receptor Activator ◽  
Polymerase Chain

Objective.To determine the effect of hyaluronic acid (HA) on proteolytic enzymes and bone remodeling mediators induced by interleukin 1β (IL-1β) and related to cartilage catabolism in murine osteoblasts.Methods.Osteoblasts were obtained from Swiss mice and cultured for 3 weeks. HA-treated osteoblasts were incubated with 100 μg/ml HA during the last week of culture, then stimulated with IL-1β (10 ng/ml) for 24 h. The expression of matrix metalloproteinases 3 and 13 (MMP-3 and MMP-13), ADAMTS-4 and ADAMTS-5, tissue inhibitor of metalloproteinases (TIMP), osteoprotegerin, and receptor activator of nuclear factor-κB ligand (RANKL) was determined by real-time polymerase chain reaction. MMP-3 and MMP-13 release was assessed by Western blot analysis.Results.IL-1β increased the mRNA levels of MMP-3 and MMP-13 and ADAMTS-4 and ADAMTS-5 and release of MMP-3 and MMP-13. Seven days of HA treatment significantly prevented the IL-1β-increased mRNA levels of MMP-3 (−61%, p < 0.01), MMP-13 (−56%, p < 0.01), ADAMTS-4 (−58%, p < 0.05), ADAMTS-5 (−52%, p < 0.01), and RANKL (−49%, p < 0.05), but not TIMP. As well, IL-1β-induced production of MMP-3 and MMP-13 was inhibited, by 27% (p < 0.01) and 40% (p < 0.01), respectively.Conclusion.In an inflammatory context in murine osteoblasts, HA can inhibit the expression of MMP and ADAMTS. Because HA can counteract the production of these mediators in chondrocytes, its beneficial effect in osteoarthritis may be due to its action on cartilage and subchondral bone.

scholarly journals Outstanding Nobility Observed in Cu5 Clusters Reveals the Key Role of Collective Quantum Effects

2021 ◽  
Author(s):  
David Buceta ◽  
Shahana Huseyinova ◽  
Miguel Cuerva ◽  
Héctor Lozano ◽  
Lisandro J. Giovanetti ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metal Clusters ◽  
Bulk Material ◽  
Chemical Properties ◽  
Quantum Effects ◽  
High Concentration ◽  
X Ray ◽  
Potential Applications ◽  
New Generation

Subnanometer-sized metal clusters often feature a molecule-like electronic structure, which makes their physical and chemical properties significantly different from those of nanoparticles and bulk material. Considering potential applications, there is a major concern about their thermal stability and susceptibility towards oxidation. Cu clusters of only 5 atoms (Cu<sub>5</sub> clusters) are first synthesized in high concentration using a new-generation wet chemical method. Next, it is shown that, contrary to what is currently assumed, Cu<sub>5</sub> clusters display nobility, beyond resistance to irreversible oxidation, at a broad range of temperatures and oxygen pressures. The outstanding nobility arises from an unusual reversible oxidation which is observed by <i>in situ</i> X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy on Cu<sub>5</sub> clusters deposited onto highly oriented pyrolitic graphite at different oxygen pressures and up to 773 K. This atypical property is explained by a theoretical approach combining different state-of-the-art first principles theories. It reveals the essential role of collective quantum effects in the physical mechanism responsible for the nobility of Cu<sub>5</sub> clusters, encompassing a structural ‘breathing’ through concerted Cu–Cu elongations/contractions upon O<sub>2</sub> uptake/release, and collective charge transfer as well. A predictive phase diagram of their reversible oxidation states is also delivered, agreeing with the experimental observations. The collective quantum effects responsible of the observed nobility are expected to be general in subnanometer-sized metal clusters, pushing this new generation of materials to an upper level.

scholarly journals Basement membrane proteoglycans in glomerular morphogenesis: chondroitin sulfate proteoglycan is temporally and spatially restricted during development.

1993 ◽  
Vol 41 (3) ◽  
pp. 401-414 ◽  
Author(s):  
K J McCarthy ◽  
K Bynum ◽  
P L St John ◽  
D R Abrahamson ◽  
J R Couchman
Keyword(s):  
Basement Membrane ◽  
Chondroitin Sulfate ◽  
Basement Membranes ◽  
Chondroitin Sulfate Proteoglycan ◽  
Sulfate Proteoglycan ◽  
Electron Microscopic ◽  
Ureteric Buds ◽  
Membrane Components ◽  
Almost All ◽  
Basement Membrane Components

We previously reported the presence of a basement membrane-specific chondroitin sulfate proteoglycan (BM-CSPG) in basement membranes of almost all adult tissues. However, an exception to this ubiquitous distribution was found in the kidney, where BM-CSPG was absent from the glomerular capillary basement membrane (GBM) but present in other basement membranes of the nephron, including collecting ducts, tubules, Bowman's capsule, and the glomerular mesangium. In light of this unique pattern of distribution and of the complex histoarchitectural reorganization occurring during nephrogenesis, the present study used light and electron microscopic immunohistochemistry to examine the distribution of BM-CSPG and basement membrane heparan sulfate proteoglycan (BM-HSPG) during prenatal and postnatal renal development in the rat. Our results show that the temporal and spatial pattern of expression of BM-CSPG during nephrogenesis is unlike that reported for other basement membrane components such as laminin, fibronectin, and BM-HSPG, all of which can be found in the earliest formed basement membranes of the vesicle-stage nephron. Although BM-CSPG is present in the basement membranes of the invading vasculature and ureteric buds, its first appearance in nephron basement membrane occurs during the late comma stage. In capillary loop-stage glomeruli of prenatal animals, BM-CSPG is present in the presumptive mesangial matrix but undetectable in the GBM. However, as postnatal glomerular maturation progresses BM-CSPG is also found in both the lamina rara interna and lamina densa of the GBM in progressively increasing amounts, being most evident in the GBM of 21-day-old animals. Micrographs of glomeruli from 42-day-old animals show that BM-CSPG gradually disappears from the GBM and, by 56 days after birth, appears to be completely absent from the GBM, its pattern of distribution resembling that of the adult animal. Our results show that BM-CSPG is not required for the initial assembly of basement membranes but may in fact serve to stabilize basement membrane structure after histoarchitectural reorganization is completed.

Impact Analysis of Machine Learning Techniques for COVID-19 Diagnosis: A Critical Review

2021 ◽  
Vol 12 (2) ◽  
pp. 510-516
Author(s):  
Anshul, Et. al.
Keyword(s):  
Machine Learning ◽  
Deep Learning ◽  
Severe Acute Respiratory Syndrome ◽  
Impact Analysis ◽  
Machine Learning Techniques ◽  
X Ray ◽  
Learning Techniques ◽  
The World ◽  
Almost All

COVID-19 virus belongs to the severe acute respiratory syndrome (SARS) family raised a situation of health emergency in almost all the countries of the world. Numerous machine learning and deep learning based techniques are used to diagnose COVID positive patients using different image modalities like CT SCAN, X-RAY, or CBX, etc. This paper provides the works done in COVID-19 diagnosis, the role of ML and DL based methods to solve this problem, and presents limitations with respect to COVID-19 diagnosis.

scholarly journals Matrix Metalloproteinases In Cancer Biology: A Review

2020 ◽  
Vol 18 (2) ◽  
Author(s):  
Ibrahim WN ◽  
Abdull Rasad MSB ◽  
Doolanea AA
Keyword(s):  
Matrix Metalloproteinases ◽  
Cancer Biology ◽  
Molecular Mechanisms ◽  
Epithelial Mesenchymal Transition ◽  
Tissue Remodelling ◽  
Mesenchymal Transition ◽  
Patients With Cancer ◽  
Online Databases ◽  
Membrane Components ◽  
Basement Membrane Components

Matrix metalloproteinases (MMPs) are a group of proteinases that are involved with the enzymatic breakdown of the extracellular matrix and basement membrane components. These enzymes are important in regulating vital physiological functions such as embryonic development, wound healing and tissue remodelling. However, several disorders may result from the exaggerated function of these enzymes such as ulcers, rheumatoid arthritis and invasive tumours. In tumours, the effect of these enzymes is not limited to invasion as it was traditionally believed but it also extends to the other oncogenic hallmark processes such as proliferation, angiogenesis, epithelial-mesenchymal transition and evasion from apoptosis. Therefore, it is essential to thoroughly understand the molecular mechanisms involved in these enzymes in cancerous tissue based on recent literature. Several reviews have highlighted the function of these enzymes in malignancies however the aim of this was to provide more recent overview to their role in malignant transformation and progression and in a briefer approach summarizing the complex molecular pathways. Online databases such as PubMed, Google scholar, Web of Science and MEDLINE were used to identify relevant articles. This approach would assist researchers by providing a list of the potential molecular targets in the sequence of changes related to these enzymes. This might help in designing a safer and a more specific targeted treatment for patients with cancer.

scholarly journals Expression of Selected Integrins and Selectins in Bullous Pemphigoid

2007 ◽  
Vol 2007 ◽  
pp. 1-7 ◽  
Author(s):  
Agnieszka Żebrowska ◽  
Anna Sysa-Jędrzejowska ◽  
Małgorzata Wągrowska-Danilewicz ◽  
Ewa Joss-Wichman ◽  
Anna Erkiert-Polguj ◽  
...  
Keyword(s):  
Bullous Pemphigoid ◽  
Healthy Subjects ◽  
Skin Lesions ◽  
Control Group ◽  
Dermoepidermal Junction ◽  
Basal Keratinocytes ◽  
Membrane Components ◽  
Inflammatory Infiltrates ◽  
Basement Membrane Components

Blister development in bullous pemphigoid (BP) results from destruction of hemidesmosomes and basement membrane components within the dermoepidermal junction by autoantibodies. Adhesion molecules can take part in pathogenesis of this disease. The aim of the study was to determine the localization and expression of L- and E-selectins andβ1,β3, andβ4 integrins by immunohistochemistry in skin lesions of 21 patients with BP, compared with 10 healthy subjects. Expression of L and E selectins andβ1,β3 integrins was detected mainly in basal keratinocytes and in inflammatory infiltrates in the dermis, expression ofβ4 integrin was irregular and was detected mainly in dermal part of the blister, while in the control group only weak and single expression of the examined molecules was detected in basal keratinocytes and endothelium cells. The obtained results reveal the important role of selected selectins and integrins in development of skin lesions in BP.

A Two-Holed Story: Structural Secrets About ClC Proteins Become Unraveled?

Physiology ◽  
2004 ◽  
Vol 19 (5) ◽  
pp. 293-299 ◽  
Author(s):  
Elena Babini ◽  
Michael Pusch
Keyword(s):  
Functional Properties ◽  
Short Review ◽  
Biophysical Properties ◽  
Physiological Functions ◽  
X Ray ◽  
Almost All

ClC Cl− channels are found in almost all organisms, ranging from bacteria to mammals, in which nine Cl− channels belonging to the ClC family have been identified. The biophysical properties and physiological functions of ClC Cl− channels have been extensively reviewed. In this short review, we will focus on recent results obtained on the X-ray structure and functional properties of the prokaryotic ClC-ec1 protein and some results obtained on the role of the cytoplasmic COOH terminus of mammalian ClCs.

The role of basement membrane components on psoriasis in mice

2016 ◽  
Vol 84 (1) ◽  
pp. e114
Author(s):  
Aki Natsumi ◽  
Koji Sugawara ◽  
Yukari Mizukami ◽  
Hisayoshi Imanishi ◽  
Daisuke Tsuruta
Keyword(s):  
Basement Membrane ◽  
Membrane Components ◽  
Basement Membrane Components
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