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Collagen Cross-linking

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https://www.readbyqxmd.com/read/28631261/distinct-post-translational-features-of-type-i-collagen-are-conserved-in-mouse-and-human-periodontal-ligament
#1
D M Hudson, M Garibov, D R Dixon, T Popowics, D R Eyre
BACKGROUND AND OBJECTIVE: Specifics of the biochemical pathways that modulate collagen cross-links in the periodontal ligament (PDL) are not fully defined. Better knowledge of the collagen post-translational modifications that give PDL its distinct tissue properties is needed to understand the pathogenic mechanisms of human PDL destruction in periodontal disease. In this study, the post-translational phenotypes of human and mouse PDL type I collagen were surveyed using mass spectrometry...
June 20, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28629592/measurement-and-clinical-utility-of-%C3%AE-ctx-in-serum-and-plasma
#2
Stephen A P Chubb, Samuel D Vasikaran
Biochemical markers of bone turnover (BTM) are released during bone remodeling and can be measured in blood or urine as noninvasive surrogate markers for the bone remodeling rate. The C-terminal cross-linked telopeptide of type I collagen (βCTX) is released during bone resorption and is specific to bone tissue. Assays have been developed to measure βCTX in blood and in urine; most current use of βCTX measurement for research and in clinical practice is performed on a blood sample. Method-specific differences for serum and plasma βCTX have led to initiatives to standardize or harmonize βCTX commercial assays...
2017: Advances in Clinical Chemistry
https://www.readbyqxmd.com/read/28628484/battling-bacterial-infection-with-hexamethylene-diisocyanate-cross-linked-and-cefaclor-loaded-collagen-scaffolds
#3
E K Tsekoura, A L Helling, J G Wall, Y Bayon, D I Zeugolis
Implant infections remain a major healthcare problem due to the prolonged hospitalisation period required to disrupt and treat bacterial biofilm formation, and the need for additional surgery to remove/replace the infected implant, which if not removed in a timely manner may lead to sepsis. Although localised drug administration, via an implanted scaffold, has shown promise in a clinical setting, the ideal scaffold cross-linking (to initially withstand the aggressive infection environment) and drug (to be effective against infection) have yet to be identified...
June 19, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28628374/effects-of-a-multispecies-probiotic-supplement-on-bone-health-in-osteopenic-postmenopausal-women-a-randomized-double-blind-controlled-trial
#4
Sadegh Jafarnejad, Kurosh Djafarian, Mohammad Reza Fazeli, Mir Saeed Yekaninejad, Abdolrahman Rostamian, Seyed Ali Keshavarz
OBJECTIVE: The development of alternative approaches to prevent and/or treat osteoporosis, as a chronic progressive bone disease, is being considered currently. Among dietary supplements, probiotics may have favorable effects on bone metabolism. Therefore, the aim of this study was to evaluate the effects of a multispecies probiotic supplementation on bone biomarkers and bone density in osteopenic postmenopausal women. METHODS: This randomized double-blind placebo-controlled clinical trial was performed on 50 patients with osteopenia aged 50-72 years...
June 19, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28626580/hernias-is-it-a-primary-defect-or-a-systemic-disorder-role-of-collagen-iii-in-all-hernias-a-case-control-study
#5
Sam Koruth, Y V Narayanaswamy Chetty
INTRODUCTION: The need of this study is to assess the role of collagen III in all hernias which include primary inguinal hernias ventral and recurrent abdominal hernias. Collagen type III represents the mechanically instable, less cross-linked collagen synthesized during the early days of wound healing. Quantitative assessment of collagen III in scar tissue on transversalis fascia as tissue obtained from cases operated for various hernias and compared to that of patients operated for abdominal surgeries for indications other than hernia was compared...
July 2017: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/28624291/vascular-lysyl-oxidase-over-expression-alters-extracellular-matrix-structure-and-induces-oxidative-stress
#6
Saray Varona, Ana B García-Redondo, Jose Martínez-González, Mercedes Salaices, Ana M Briones, Cristina Rodríguez
INTRODUCTION: Lysyl oxidase (LOX) participates in the assembly of collagen and elastin fibres. The impact of vascular LOX over-expression on extracellular matrix (ECM) structure and its contribution to oxidative stress has been analysed. METHODS: Studies were conducted on mice over-expressing LOX (Tg), specifically in smooth muscle cells (VSMC). Gene expression was assessed by real-time PCR analysis. Sirius Red staining, H2O2 production and NADPH oxidase activity were analysed in different vascular beds...
June 14, 2017: Clínica e Investigación en Arteriosclerosis
https://www.readbyqxmd.com/read/28617950/effect-of-cross-linked-vs-non-cross-linked-collagen-membranes-on-bone-a-systematic-review
#7
REVIEW
J Jiménez Garcia, S Berghezan, J M M Caramês, M M Dard, D N S Marques
The aim of this study was to conduct a systematic review to compare the clinical outcomes of two different resorbable collagen membranes in terms of regenerated bone volume, postoperative complications and membrane degradation during bone regeneration procedures. Randomized controlled trials (RCT) or controlled trials (CT) that compared both techniques were reviewed on four electronic databases up to December 2015, a manual search was performed on the bibliography of the collected articles and the authors were contacted for additional references if undetected on the electronic and manual search...
June 15, 2017: Journal of Periodontal Research
https://www.readbyqxmd.com/read/28603017/effects-of-diabetes-mellitus-on-biomechanical-properties-of-the-rabbit-cornea
#8
FangJun Bao, ManLi Deng, XiaoBo Zheng, LinNa Li, YiPing Zhao, Si Cao, AYong Yu, QinMei Wang, JinHai Huang, Ahmed Elsheikh
To investigate the effects of diabetes on the biomechanical behavior of cornea in alloxan-induced diabetic rabbits. Diabetes mellitus (DM) was induced in 20 rabbits using alloxan, while another 20 age- and weight-matched non-diabetic rabbits served as controls. Eyes were enucleated after 8 weeks of inducing diabetes and the whole cornea was removed with a 3 mm wide scleral ring and tested under inflation conditions with an internal pressure range of 2.0-30.0 mmHg to determine their stress-strain behavior using an inverse analysis process...
June 8, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28602782/associations-between-serum-ghrelin-and-knee-symptoms-joint-structures-and-cartilage-or-bone-biomarkers-in-patients-with-knee-osteoarthritis
#9
J Wu, K Wang, J Xu, G Ruan, Q Zhu, J Cai, J Ren, S Zheng, Z Zhu, P Otahal, C Ding
OBJECTIVE: The roles of ghrelin in knee osteoarthritis (OA) are unclear. This study aimed to examine cross-sectional associations of ghrelin with knee symptoms, joint structures and cartilage or bone biomarkers in patients with knee OA. METHODS: This study included 146 patients with symptomatic knee OA. Serum levels of ghrelin and cartilage or bone biomarkers including cartilage oligomeric matrix protein (COMP), cross linked C-telopeptide of type I collagen (CTXI), cross linked N-telopeptide of type I collagen (NTXI), N-terminal procollagen III propeptide (PIIINP), and matrix metalloproteinase (MMP)-3, 10, 13 were measured using Enzyme-linked immunosorbent assay (ELISA)...
June 15, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28592915/activated-platelets-induce-an-anti-inflammatory-response-of-monocytes-macrophages-through-cross-regulation-of-pge2-and-cytokines
#10
Bona Linke, Yannick Schreiber, Bettina Picard-Willems, Patrick Slattery, Rolf M Nüsing, Sebastian Harder, Gerd Geisslinger, Klaus Scholich
Platelets are well known for their role in hemostasis and are also increasingly recognized for their roles in the innate immune system during inflammation and their regulation of macrophage activation. Here, we aimed to study the influence of platelets on the production of inflammatory mediators by monocytes and macrophages. Analyzing cocultures of platelets and murine bone marrow-derived macrophages or human monocytes, we found that collagen-activated platelets release high amounts of prostaglandin E2 (PGE2) that leads to an increased interleukin- (IL-) 10 release and a decreased tumor necrosis factor (TNF) α secretion out of the monocytes or macrophages...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28592658/the-structural-response-of-the-cornea-to-changes-in-stromal-hydration
#11
Sally Hayes, Tomas White, Craig Boote, Christina S Kamma-Lorger, James Bell, Thomas Sorenson, Nick Terrill, Olga Shebanova, Keith M Meek
The primary aim of this study was to quantify the relationship between corneal structure and hydration in humans and pigs. X-ray scattering data were collected from human and porcine corneas equilibrated with polyethylene glycol (PEG) to varying levels of hydration, to obtain measurements of collagen fibril diameter, interfibrillar spacing (IFS) and intermolecular spacing. Both species showed a strong positive linear correlation between hydration and IFS(2) and a nonlinear, bi-phasic relationship between hydration and fibril diameter, whereby fibril diameter increased up to approximately physiological hydration, H = 3...
June 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28589787/conditioned-medium-from-the-three-dimensional-culture-of-human-umbilical-cord-perivascular-cells-accelerate-the-migration-and-proliferation-of-human-keratinocyte-and-fibroblast
#12
Min Ho Kim, Wen Hao Wu, Jee Hyun Choi, Ji Hyun Kim, Seok-Ho Hong, Jin Hyun Jun, Yong Ko, Jong Hun Lee
Previous studies have reported that the conditioned medium (CM) of bone marrow-mesenchymal stem cells (BM-MSCs) stimulate the migration and proliferation of cell types involved in the wound healing process. However, these studies only show MSC-CM effects that were obtained using a two-dimensional (2D) culture. Recently, a three-dimensional (3D) culture has been considered to be a more physiologically appropriate system than the 2D culture. In addition, it has been shown that the procurement of BM-MSC is invasive, and other sources of MSC are thus being explored...
June 18, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28584579/effect-of-soy-isoflavones-supplement-on-climacteric-symptoms-bone-biomarkers-and-quality-of-life-in-korean-postmenopausal-women-a-randomized-clinical-trial
#13
Hansongyi Lee, Ryowon Choue, Hyunjung Lim
BACKGROUND/OBJECTIVES: Soy isoflavones are expected to improve menopausal symptoms and osteoporosis in women. However, their efficacy is still inconclusive, and there was limited data for postmenopausal women in South Korea. We examined the effects of soy isoflavones on climacteric symptoms, bone biomarkers, and quality of life in Korean postmenopausal women. SUBJECTS/METHODS: A randomized, double-blind study design was used. Eighty-seven participants who had undergone natural menopause were randomly administered either 70 mg/day isoflavones (n = 43) or placebo (n = 41) for 12 weeks...
June 2017: Nutrition Research and Practice
https://www.readbyqxmd.com/read/28577892/effects-of-edc-crosslinking-on-the-stiffness-of-dentin-hybrid-layers-evaluated-by-nanodma-over-time
#14
Zihou Zhang, Mustafa Mutluay, Arzu Tezvergil-Mutluay, Franklin R Tay, David H Pashley, Dwayne Arola
Application of collagen cross-linkers to demineralized dentin improves bond durability. While the benefits of cross-linking treatments to bond strength and fatigue resistance have been explored, changes in hybrid layer stiffness with aging have not been examined. OBJECTIVE: To examine the influence of a cross-linking treatment using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) on hybrid layer stiffness of resin-dentin adhesive bonds, using spatially-resolved nanoscopic Dynamic Mechanical Analysis (nanoDMA)...
May 31, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28576718/effect-of-altered-haemodynamics-on-the-developing-mitral-valve-in-chick-embryonic-heart
#15
Kar Lai Pang, Matthew Parnall, Siobhan Loughna
Intracardiac haemodynamics is crucial for normal cardiogenesis, with recent evidence showing valvulogenesis is haemodynamically dependent and inextricably linked with shear stress. Although valve anomalies have been associated with genetic mutations, often the cause is unknown. However, altered haemodynamics have been suggested as a pathogenic contributor to bicuspid aortic valve disease. Conversely, how abnormal haemodynamics impacts mitral valve development is still poorly understood. In order to analyse altered blood flow, the outflow tract of the chick heart was constricted using a ligature to increase cardiac pressure overload...
May 30, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28575983/evaluation-of-nanohydroxyapaptite-nano-ha-coated-epigallocatechin-3-gallate-egcg-cross-linked-collagen-membranes
#16
Chenyu Chu, Jia Deng, Yi Man, Yili Qu
Collagen is the main component of extracellular matrix (ECM) with desirable biological activities and low antigenicity. Collagen materials have been widely utilized in guided bone regeneration (GBR) surgery due to its abilities to maintain space for hard tissue growth. However, pure collagen lacks optimal mechanical properties. In our previous study, epigallocatechin-3-gallate (EGCG) cross-linked collagen membranes, with better biological activities and enhanced mechanical properties, may promote osteoblast proliferation, but their effect on osteoblast differentiation is not very significant...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28574510/rip4-inhibits-stat3-signaling-to-sustain-lung-adenocarcinoma-differentiation
#17
Jawahar Kopparam, Johanna Chiffelle, Paolo Angelino, Alessandra Piersigilli, Nadine Zangger, Mauro Delorenzi, Etienne Meylan
Loss of epithelial differentiation and extracellular matrix (ECM) remodeling are known to facilitate cancer progression and are associated with poor prognosis in patients with lung cancer. We have identified Receptor-interacting serine/threonine protein kinase 4 (RIP4) as a regulator of tumor differentiation in lung adenocarcinoma (AC). Bioinformatics analyses of human lung AC samples showed that poorly differentiated tumors express low levels of RIP4, whereas high levels are associated with better overall survival...
June 2, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28573997/allergen-specific-exposure-associated-with-high-immunoglobulin-e-and-eye-rubbing-predisposes-to-progression-of-keratoconus
#18
Rohit Shetty, Shraddha Sureka, Pallak Kusumgar, Swaminathan Sethu, Kanchan Sainani
We report two male children with persistent allergic eye disease (AED) and keratoconus (KC). Both presented with symptoms of vernal keratoconjunctivitis and decreased vision. In view of unrelenting AED, serum immunoglobulin E (IgE) quantification and identification of specific allergens were advised. Increased serum IgE levels were observed in both cases. Sunflower and sheep wool were identified as specific allergens for the first and second patient respectively by skin patch test. There was complete resolution of symptoms of AED in both patients following avoidance of causative allergens...
May 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28573777/once-weekly-administration-of-a-long-acting-fgf21-analogue-modulates-lipids-bone-turnover-markers-blood-pressure-and-body-weight-differently-in-obese-hypertriglyceridemic-subjects-and-in-non-human-primates
#19
Albert M Kim, Veena R Somayaji, Jennifer Q Dong, Timothy P Rolph, Yan Weng, Jeffrey R Chabot, Kathryn E Gropp, Saswata Talukdar, Roberto A Calle
AIMS: To assess the safety, tolerability, pharmacokinetics and pharmacodynamics of PF-05231023, a long-acting FGF21 analogue, in obese, hypertriglyceridemic subjects on atorvastatin with or without type 2 diabetes. METHODS: Subjects received PF-05231023 or placebo intravenously once-weekly for 4 weeks. Safety (12-lead electrocardiogram [ECGs], vital signs, adverse events [AEs], laboratory tests) and longitudinal weight assessments were performed. Blood samples were collected for pharmacokinetic and pharmacodynamic analyses...
June 1, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28566555/cross-linked-matrix-rigidity-and-soluble-retinoids-synergize-in-nuclear-lamina-regulation-of-stem-cell-differentiation
#20
Irena L Ivanovska, Joe Swift, Kyle Spinler, Dave Dingal, Sangkyun Cho, Dennis E Discher
Synergistic cues from extracellular matrix and soluble factors are often obscure in differentiation. Here, the rigidity of crosslinked collagen synergizes with retinoids in the osteogenesis of human marrow mesenchymal stem cells (MSCs). Collagen nano-films serve as a model matrix that MSCs can easily deform unless the film is enzymatically crosslinked, which promotes the spreading of cells and the stiffening of nuclei as both actomyosin assembly and nucleoskeletal lamin-A increase. Expression of lamin-A is known to be controlled by Retinoic Acid Receptor (RAR) transcription factors, but rigid matrix is needed to induce rapid nuclear accumulation of the RARG isoform and subsequent expression of osteogenic markers...
May 31, 2017: Molecular Biology of the Cell
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