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Collagen Cross-linking

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https://www.readbyqxmd.com/read/28429547/the-use-of-bone-turnover-markers-in-chronic-kidney-disease-mineral-and-bone-disorders
#1
Cherie Chiang
Bone turnover markers assist in fracture risk prediction, management and monitoring of osteoporosis in patients without chronic kidney disease (CKD). The use in CKD-mineral bone disorder (MBD) has been limited as many of these markers and breakdown products are renally excreted, including the most commonly used and well standardized procollagen type I N propeptide and C-terminal cross-linking telopeptide of type I collagen. Of the markers unaffected by renal function, bone specific alkaline phosphatase is associated with mortality and fracture rate in CKD subjects and is now available on several automated analysers...
March 2017: Nephrology
https://www.readbyqxmd.com/read/28424209/the-sulfilimine-cross-link-of-collagen-iv-contributes-to-kidney-tubular-basement-membrane-stiffness
#2
Gautam Bhave, Selene Colon, Nicholas Ferrell
Basement membranes (BMs) are a specialized form of extracellular matrix (ECM) which underlie nearly all cell layers and provide structural support for tissues and interact with cell surface receptors to determine cell behavior. Both macromolecular composition and stiffness of BM influence cell-BM interactions. Collagen IV is major constituent of BM that forms an extensively cross-linked oligomeric network. Its deficiency leads to BM mechanical instability as observed with glomerular basement membrane (GBM) in Alport Syndrome...
April 19, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28423580/procollagen-lysine-2-oxoglutarate-5-dioxygenase-2-promotes-hypoxia-induced-glioma-migration-and-invasion
#3
Yangyang Xu, Lin Zhang, Yuzhen Wei, Xin Zhang, Ran Xu, Mingzhi Han, Bing Huang, Anjing Chen, Wenjie Li, Qing Zhang, Gang Li, Jian Wang, Peng Zhao, Xingang Li
Poor prognosis of glioblastoma multiforme is strongly associated with the ability of tumor cells to invade the brain parenchyma, which is believed to be the major factor responsible for glioblastoma recurrence. Therefore, identifying the molecular mechanisms driving invasion may lead to the development of improved therapies for glioblastoma patients. Here, we investigated the role of procollagen-lysine 2-oxoglutarate 5-dioxygenase 2 (PLOD2), an enzyme catalyzing collagen cross-linking, in the biology of glioblastoma invasion...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415047/plod2-in-cancer-research
#4
REVIEW
Hongzhi Du, Mao Pang, Xiaoying Hou, Shengtao Yuan, Li Sun
Collagen is not only the most abundant protein providing the scaffold for assembly of the extracellular matrix (ECM), but also considered to be the "highway" for cancer cell migration and invasion depending on the different collagen organizations. The accumulation of stabilized collagen is enhanced by different covalent collagen cross-links, lysyl hydroxylases 2 (encoded by the PLOD2 gene) is the key enzyme mediating the formation of the stabilized collagen cross-link. Interestingly, PLOD2 is overexpressed in different cancers and closely related to a poor prognosis...
April 14, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28412025/the-influence-of-chronic-il-6-exposure-in-vivo-on-rat-achilles-tendon-extracellular-matrix
#5
Mark S Katsma, Shivam H Patel, Erica Eldon, Kathryn A Corbell, Kevin L Shimkus, James D Fluckey, Chad C Carroll
When compared to placebo, acetaminophen (APAP) reduces tendon stiffness and collagen cross-linking. APAP also enhances the exercise-induced increase in peritendinous levels of IL-6. Elevated levels of IL-6 are associated with tendinopathy, thus we hypothesized that chronic, elevated peritendinous IL-6 would alter tendon extracellular matrix (ECM). IL-6 (∼3000pgml(-1)) was injected (3dwk(-1) for 8-wks) into the Achilles peritendinous region of male Wistar rats (n=16) with the opposite leg serving as a sham...
April 13, 2017: Cytokine
https://www.readbyqxmd.com/read/28411253/a-new-path-to-platelet-production-through-matrix-sensing
#6
Vittorio Abbonante, Christian Andrea Di Buduo, Cristian Gruppi, Carmelo De Maria, Elise Spedden, Aurora De Acutis, Cristian Staii, Mario Raspanti, Giovanni Vozzi, David Kaplan, Francesco Moccia, Katya Ravid, Alessandra Balduini
Megakaryocytes in the bone marrow are immersed in a network of extracellular matrix (ECM) components that regulate platelet release into the circulation. Combining biological and bioengineering approaches, we found that the activation of transient receptor potential cation channel subfamily V member 4 (TRPV4), a mechano-sensitive ion channel, is induced upon megakaryocyte adhesion on softer matrices. This response promoted platelet production by triggering a cascade of events that lead to calcium influx, β1 integrin activation and internalization, and Akt phosphorylation, responses not found on stiffer matrices...
April 14, 2017: Haematologica
https://www.readbyqxmd.com/read/28407169/collagen-cross-linking-with-photoactivated-riboflavin-pack-cxl-for-bacterial-keratitis-after-small-incision-lenticule-extraction-smile
#7
Tommy C Y Chan, Vanissa W S Chow, Vishal Jhanji
PURPOSE: To report a case of infectious keratitis after small incision lenticule extraction (SMILE) treated with collagen cross-linking with photoactivated riboflavin (PACK-CXL). METHODS: Case report and literature review. RESULTS: A patient presented with culture-proven bacterial keratitis 5 days after SMILE was treated with fortified topical antibiotics and PACK-CXL. Irrigation of the corneal cap-stromal bed interface, which can be difficult and affect visual outcomes, was not performed...
April 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28394292/gender-specific-impact-of-cadmium-exposure-on-bone-metabolism-in-older-people-living-in-a-cadmium-polluted-area-in-thailand
#8
Muneko Nishijo, Kowit Nambunmee, Dhitiwass Suvagandha, Witaya Swaddiwudhipong, Werawan Ruangyuttikarn, Yoshikazu Nishino
To elucidate the influence of cadmium exposure on bone metabolism, associations between urinary/blood cadmium and bone resorption/formation markers were investigated in older cadmium exposed men and women. Increased urinary cross-linked N-telopeptide of type I collagen (NTx), a bone resorption marker, was found to be associated with increased levels of parathyroid hormone, fractional excretion of calcium, and urinary/blood cadmium after adjusting for confounding factors in men. In women, urinary NTx was significantly associated with only urinary cadmium and a strong relationship with increased fractional excretion of calcium...
April 10, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28381643/quantification-of-the-efficacy-of-collagen-cross-linking-agents-to-induce-stiffening-of-rat-sclera
#9
Ian C Campbell, Bailey G Hannon, A Thomas Read, Joseph M Sherwood, Stephen A Schwaner, C Ross Ethier
The concept of scleral stiffening therapies has emerged as a novel theoretical approach for treating the ocular disorders glaucoma and myopia. Deformation of specific regions of the posterior eye is innately involved in the pathophysiology of these diseases, and thus targeted scleral stiffening could resist these changes and slow or prevent progression of these diseases. Here, we present the first systematic screen and direct comparison of the stiffening effect of small molecule collagen cross-linking agents in the posterior globe, namely using glyceraldehyde, genipin and methylglyoxal (also called pyruvaldehyde)...
April 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28378777/fkbp65-dependent-peptidyl-prolyl-isomerase-activity-potentiates-the-lysyl-hydroxylase-2-driven-collagen-cross-link-switch
#10
Yulong Chen, Masahiko Terajima, Priyam Banerjee, Houfu Guo, Xin Liu, Jiang Yu, Mitsuo Yamauchi, Jonathan M Kurie
Bruck Syndrome is a connective tissue disease associated with inactivating mutations in lysyl hydroxylase 2 (LH2/PLOD2) or FK506 binding protein 65 (FKBP65/FKBP10). However, the functional relationship between LH2 and FKBP65 remains unclear. Here, we postulated that peptidyl prolyl isomerase (PPIase) activity of FKBP65 positively modulates LH2 enzymatic activity and is critical for the formation of hydroxylysine-aldehyde derived intermolecular collagen cross-links (HLCCs). To test this hypothesis, we analyzed collagen cross-links in Fkbp10-null and -wild-type murine embryonic fibroblasts...
April 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28376767/high-dose-vitamin-d-supplementation-does-not-affect-biochemical-bone-markers-in-multiple-sclerosis-a-randomized-controlled-trial
#11
Trygve Holmøy, Jonas Christoffer Lindstrøm, Erik Fink Eriksen, Linn Hofsøy Steffensen, Margitta T Kampman
BACKGROUND: People with multiple sclerosis have high risk of osteoporosis and fractures. A poor vitamin D status is a risk factor for MS, and vitamin D supplementation has been recommended both to prevent MS progression and to maintain bone health. METHODS: We assessed the effect of 20,000 IU vitamin D3 weekly compared to placebo on biochemical markers of bone metabolism in 68 persons with relapsing remitting multiple sclerosis. RESULTS: Serum levels of 25-hydroxyvitamin D more than doubled in the vitamin D group, and parathyroid hormone decreased in the vitamin D group compared to the placebo group at week 48 and week 96...
April 4, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28375819/in-vivo-immune-responses-of-cross-linked-electrospun-tilapia-collagen-membrane
#12
Ammar Mansoor Hassanbhai, Chau Sang Lau, Feng Wen, Praveena Jayaraman, Bee Tin Goh, Na Yu, Swee-Hin Teoh
Collagen has been used extensively in tissue engineering applications. However, the source of collagen has been primarily bovine and porcine. In view of the potential risk of zoonotic diseases and religious constraints associated with bovine and porcine collagen, fish collagen was examined as an alternative. The aim of this study is to use tilapia fish collagen to develop a cross-linked electrospun membrane to be used as a barrier membrane in guided bone regeneration. As there is limited data available on the cytotoxicity and immunogenicity of cross-linked tilapia collagen, in vitro and in vivo tests were performed to evaluate this in comparison to the commercially available Bio-Gide(®) membrane...
March 30, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28372518/collagen-membrane-and-immune-response-in-guided-bone-regeneration-recent-progress-and-perspectives
#13
Chenyu Chu, Jia Deng, Xianchang Sun, Yili Qu, Yi Man
Collagen is one of the important components of collagen membranes as well as the extracellular matrix (ECM). Most previous studies have focused on combining collagen membranes with various cross-linking agents, grafting materials, and cytokines to enhance their mechanical properties and bioactivities. Moreover, collagen membranes are often designed to minimize foreign body reactions involving macrophages. However, macrophages were recently found to play a pivotal role during bone regeneration based on their polarization into both pro-inflammatory and anti-inflammatory phenotypes...
April 3, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28371893/tissue-transglutaminase-induction-in-the-pressure-overloaded-myocardium-regulates-matrix-remodeling
#14
Arti V Shinde, Marcin Dobaczewski, Judith J de Haan, Amit Saxena, Kang-Kon Lee, Ying Xia, Wei Chen, Ya Su, Waqas Hanif, Inderpreet Kaur Madahar, Victor M Paulino, Gerry Melino, Nikolaos G Frangogiannis
Aims: : Tissue transglutaminase (tTG) is induced in injured and remodeling tissues, and modulates cellular phenotype, while contributing to matrix cross-linking. Our study tested the hypothesis that tTG may be expressed in the pressure-overloaded myocardium, and may regulate cardiac function, myocardial fibrosis and chamber remodeling. Methods and results: In order to test the hypothesis, wildtype and tTG null mice were subjected to pressure overload induced through transverse aortic constriction...
March 28, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28370407/bps804-anti-sclerostin-antibody-in-adults-with-moderate-osteogenesis-imperfecta-results-of-a-randomized-phase-2a-trial
#15
Francis H Glorieux, Jean-Pierre Devogelaer, Michaela Durigova, Stefan Goemaere, Sarah Hemsley, Franz Jakob, Uwe Junker, Jon Ruckle, Lothar Seefried, Peter J Winkle
TRIAL DESIGN: This 21-week, open-label, phase 2a trial aimed to evaluate the pharmacodynamics and safety of multiple, escalating infusions of BPS804, a neutralizing, anti-sclerostin antibody, in adults with moderate osteogenesis imperfecta (OI). METHODS: Patients received BPS804 (three escalating doses each separated by 2 weeks [5, 10 and 20 mg/kg]) or no treatment (reference group). The primary efficacy endpoints were mean changes from baseline to day 43 in: procollagen type 1 N-terminal propeptide (P1NP), procollagen type 1 C-terminal propeptide (P1CP), bone-specific alkaline phosphatase (BSAP), osteocalcin (OC) and type 1 collagen cross-linked C-telopeptide (CTX-1)...
March 29, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28370361/randomized-clinical-trial-of-ridge-preservation-using-porcine-bone-cross-linked-collagen-vs-bovine-bone-non-cross-linked-collagen-cone-beam-computed-tomographic-analysis
#16
Hyun-Chang Lim, Ui-Won Jung, Hoon You, Jung-Seok Lee
PURPOSE: The aim of this study was to radiographically compare horizontal and vertical alterations of the alveolar ridge after ridge preservation using different combinations of biomaterials. MATERIALS AND METHODS: The patients were randomly assigned into two groups: (a) the test group, which received collagenated porcine bone plus cross-linked collagen membrane (n = 15), and (b) the control group, which received collagenated bovine bone plus non-cross-linked collagen membrane (n = 15)...
March 28, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28365565/bilirubin-prevents-atherosclerotic-lesion-formation-in-low-density-lipoprotein-receptor-deficient-mice-by-inhibiting-endothelial-vcam-1-and-icam-1-signaling
#17
Megan E Vogel, Gila Idelman, Eddy S Konaniah, Stephen D Zucker
BACKGROUND: Numerous epidemiological studies support an inverse association between serum bilirubin levels and the incidence of cardiovascular disease; however, the mechanism(s) by which bilirubin may protect against atherosclerosis is undefined. The goals of the present investigations were to assess the ability of bilirubin to prevent atherosclerotic plaque formation in low-density lipoprotein receptor-deficient (Ldlr(-/-) ) mice and elucidate the molecular processes underlying this effect...
April 1, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28358253/comparison-of-accelerated-corneal-collagen-cross-linking-types-for-treating-keratoconus
#18
Yusuf Yıldırım, Onur Olcucu, Zehra Karaagac Gunaydin, Alper Ağca, Engin Bilge Ozgurhan, Cengiz Alagoz, Cagri Mutaf, Ahmet Demirok
PURPOSE: To compare the results of different protocols for accelerated corneal collagen cross-linking (CXL) in patients with progressive keratoconus. MATERIALS AND METHOD: This prospective comparative study involved 40 patients treated with intended UV-A radiance of 5.4 J/cm(2) in 74 eyes (Group 1) and 42 patients treated with radiance of 7.2 J/cm(2) in 72 eyes (Group 2). Visual acuity, subjective manifest refraction and corneal topography were analyzed before and 12 months after surgery in both groups...
March 30, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28341762/a-prospective-observational-study-on-effect-of-short-term-periodic-steroid-premedication-on-bone-metabolism-in-gastrointestinal-cancer-espresso-01
#19
Michio Nakamura, Atsushi Ishiguro, Tetsuhito Muranaka, Hiraku Fukushima, Satoshi Yuki, Kota Ono, Taichi Murai, Chika Matsuda, Ayane Oba, Kazufumi Itaya, Takayuki Sone, Masataka Yagisawa, Yuta Koike, Ayana Endo, Yoko Tsukuda, Yuji Ono, Takahiko Kudo, Atsushi Nagasaka, Shuji Nishikawa, Yoshito Komatsu
BACKGROUND: A multicenter prospective observational study evaluated the effect of gastrointestinal cancer chemotherapy with short-term periodic steroid premedication on bone metabolism. PATIENTS AND METHODS: Seventy-four patients undergoing chemotherapy for gastrointestinal cancer were studied. The primary endpoints were changes in bone mineral densities (BMDs) and metabolic bone turnover 16 weeks after initiation of chemotherapy. BMDs, measured by dual-energy x-ray absorptiometry, and serum cross-linked N-telopeptides of type I collagen (sNTX), and bone alkaline phosphatase (sBAP) were assessed for evaluation of bone resorption and formation, respectively...
March 24, 2017: Oncologist
https://www.readbyqxmd.com/read/28340021/phenamil-an-amiloride-derivative-restricts-long-bone-growth-and-alters-keeled-sternum-bone-architecture-in-growing-chickens
#20
Tara R Price, Kristin Moncada, Hector Leyva-Jimenez, Kye Won Park, Peter Tontonoz, Rosemary L Walzem
"Broiler-type" chickens are fast-grow-ing, heavy-bodied birds with high demands on bone quality. Phenamil increased mineralization in cultured murine mesenchymal stem cells. Phenamil effects were tested in 2 groups of weight and gender matched day-old broiler chickens (n = 13). Oral administration of 30 mg phenamil/kg body weight d 1 to 13 reduced growth of chicks d 5 to 14 (P = 0.002); with phenamil-treated (PT) chick body weight being 84% of vehicle-treated (VT) chicks' body weight on d 14. Tissues collected on d 15 showed that femur lengths and widths did not differ, but tibias from PT chicks were 6% shorter (P = 0...
March 3, 2017: Poultry Science
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