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Collagen and Elastin Studies

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https://www.readbyqxmd.com/read/30335541/the-tropoelastin-and-lysyl-oxidase-treatments-increased-the-content-of-insoluble-elastin-in-bioprosthetic-heart-valves
#1
Yang Lei, Yushun Xia, Yunbing Wang
Valvular heart diseases lead to over 300,000 heart valve replacements worldwide each year. Commercially available bioprosthetic heart valves (BHVs) are mostly made from porcine or bovine pericardiums which were crosslinked by glutaraldehyde (GLUT). However, valve failures can occur within 10 years due to progressive degradation and calcification. GLUT could crosslink collagen but it fails to stabilize elastin. In this current study, we developed a new BHVs preparation strategy named as "GLUT/TE/LOXL/EGCG" that utilizes exogenous tropoelastin (TE)/lysyl oxidase (LOXL) and epigallocatechin gallate (EGCG) to increase the elastin content as well as the stabilization of elastin...
October 18, 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/30326277/radical-polymerization-crosslinking-method-for-improving-extracellular-matrix-stability-in-bioprosthetic-heart-valves-with-reduced-potential-for-calcification-and-inflammatory-response
#2
Gaoyang Guo, Linhe Jin, Wanyu Jin, Liang Chen, Yang Lei, Yunbing Wang
In recent years, the number of heart valve replacements has multiplied with valve diseases because of aging populations and the surge in rheumatic heart disease in young people. Among them, bioprosthetic heart valves (BHVs) have become increasingly popular. Transcatheter aortic valve implantation (TAVI) valve as an emerging BHV has been increasingly applied to patients. However, the current commercially used BHVs treated with glutaraldehyde (Glut) still face the problem of durability. BHVs derived from Glut-treated xenogenetic tissues would undergo structural degeneration and calcification sometimes even as short as less than 10 years...
October 13, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/30321593/bone-morphogenetic-protein-2-increases-lysyl-oxidase-activity-via-up-regulation-of-snail-in-human-granulosa-lutein-cells
#3
Long Bai, Hsun-Ming Chang, Yi-Min Zhu, Peter C K Leung
Lysyl oxidase (LOX) is a copper-dependent enzyme that maintains and stabilizes the extracellular matrix (ECM) by catalyzing the cross-linking of elastin and collagen. ECM within the ovarian follicle plays a crucial role in regulating follicular development and oocyte maturation. Bone morphogenetic protein 2 (BMP2) belongs to the BMP subfamily that has been shown to be involved in the process of ovarian folliculogenesis and luteal formation. To date, whether BMP2 regulates the activity of LOX during human follicular development remains to be elucidated...
October 12, 2018: Cellular Signalling
https://www.readbyqxmd.com/read/30314721/protease-activated-receptors-are-potential-regulators-in-the-development-of-arterial-endofibrosis-in-high-performance-athletes
#4
Jelle J Posthuma, Jens J N Posma, Goof Schep, Mart M H Bender, Rene van Oerle, Allard C van der Wal, Hugo Ten Cate, Henri M H Spronk
OBJECTIVE: High-performance athletes can develop symptomatic arterial flow restriction during exercise caused by endofibrosis. The pathogenesis is poorly understood; however, coagulation enzymes, such as tissue factor (TF) and coagulation factor Xa, might contribute to the fibrotic process, which is mainly regulated through activation of protease-activated receptors (PARs). Therefore, the aim of this explorative study was to evaluate the presence of coagulation factors and PARs in endofibrotic tissue, which might be indicative of their potential role in the natural development of endofibrosis...
October 9, 2018: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/30282912/milieu-for-endothelial-differentiation-of-human-adipose-derived-stem-cells
#5
Kendra Clark, Amol V Janorkar
Human adipose-derived stem cells (hASCs) have been shown to differentiate down many lineages including endothelial lineage. We hypothesized that hASCs would more efficiently differentiate toward the endothelial lineage when formed as three-dimensional (3D) spheroids and with the addition of vascular endothelial growth factor (VEGF). Three conditions were tested: uncoated tissue culture polystyrene (TCPS) surfaces that induced a 2D monolayer formation; elastin-like polypeptide (ELP)-collagen composite hydrogel scaffolds that induced encapsulated 3D spheroid culture; and ELP-polyethyleneimine-coated TCPS surfaces that induced 3D spheroid formation in scaffold-free condition...
October 3, 2018: Bioengineering
https://www.readbyqxmd.com/read/30281664/structural-characterization-of-four-different-naturally-occurring-porcine-collagen-membranes-suitable-for-medical-applications
#6
Thimo Maurer, Michael H Stoffel, Yury Belyaev, Niklaus G Stiefel, Beatriz Vidondo, Susanne Küker, Helga Mogel, Birgit Schäfer, Jasmin Balmer
Collagen is the main structural element of connective tissues, and its favorable properties make it an ideal biomaterial for regenerative medicine. In dental medicine, collagen barrier membranes fabricated from naturally occurring tissues are used for guided bone regeneration. Since the morphological characteristics of collagen membranes play a crucial role in their mechanical properties and affect the cellular behavior at the defect site, in-depth knowledge of the structure is key. As a base for the development of novel collagen membranes, an extensive morphological analysis of four porcine membranes, including centrum tendineum, pericardium, plica venae cavae and small intestinal submucosa, was performed...
2018: PloS One
https://www.readbyqxmd.com/read/30280483/effect-of-platelet-rich-plasma-on-proliferation-and-migration-in-human-dermal-fibroblasts
#7
Eun Byul Cho, Gil Soon Park, Seok Soon Park, Ye Ji Jang, Kwang Ho Kim, Kwang Joong Kim, Eun Joo Park
BACKGROUND: Platelet-rich plasma (PRP) is a blood fraction that contains high concentrations of several growth factors. PRP has been recently used in skin wound healing and rejuvenation. However, the precise molecular mechanisms underlying PRP-induced wound healing are unknown. AIMS: This study aimed to evaluate the effects of PRP on extracellular matrix remodeling, which requires the activation of dermal fibroblasts. METHODS: Cell proliferation and migration assay, enzyme-linked immunosorbent analysis, and Western blotting were performed on PRP-treated human skin fibroblasts...
October 2, 2018: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/30276490/q-switched-1064-nm-nd-yag-nanosecond-laser-effects-on-skin-barrier-function-and-on-molecular-rejuvenation-markers-in-keratinocyte-fibroblasts-interaction
#8
Anna De Filippis, Brunella Perfetto, Luigi Pio Guerrera, Giovanni Oliviero, Adone Baroni
Skin represents an interface between internal and external environment; it protects human body by regulating the water loss and the maintenance of body temperature, defending against irritant and pathogen agents, and against physical, chemical, and UV damage. It provides to essential physiological functions, such as the important antioxidant defense capacity; its protective/defensive function is performed by a high number of proteins, and shows important functions in maintenance of skin barrier homeostasis...
October 1, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/30271862/anterior-cruciate-ligament-derived-mesenchymal-stromal-cells-have-a-propensity-to-differentiate-into-the-ligament-lineage
#9
Yusuke Ogata, Yo Mabuchi, Kosuke Shinoda, Yuta Horiike, Mitsuru Mizuno, Koji Otabe, Eriko Grace Suto, Nobuharu Suzuki, Ichiro Sekiya, Chihiro Akazawa
Introduction: The anterior cruciate ligament (ACL) consists of various components, such as collagen, elastin fibres, and fibroblasts. Because ACL has a poor regenerative ability, ACL reconstruction need require the use of autologous tendons. In recent years, tissue-resident stem cells have been studied to promote ACL regeneration as an alternatively method. However, the existence of stem cells in ligaments has not been clearly defined. Here, we prospectively isolated stem cells from ACLs and characterized their properties...
June 2018: Regenerative Therapy
https://www.readbyqxmd.com/read/30267556/intratunical-injection-of-stromal-vascular-fraction-prevents-fibrosis-in-a-rat-model-of-peyronie-s-disease
#10
Fabio Castiglione, Petter Hedlund, Emanuel Weyne, Lukman Hakim, Francesco Montorsi, Andrea Salonia, Trinity J Bivalacqua, Dirk De Ridder, Uros Milenkovic, David Ralph, Giulio Garaffa, Asif Muneer, Steven Joniau, Maarten Albersen
OBJECTIVE: Previous studies have shown that the injection of adipose tissue-derived stem cells (ADSCs) into the tunica albuginea (TA) during the active phase of the Peyronie's disease (PD) prevents the development of fibrosis and elastosis in the TA and corpus cavernosum The aim of this study was to investigate whether local injection of autologous adipose stromal vascular fraction (SVF) can prevent the development of fibrosis and elastosis in the TA using a rat model of acute phase of the Peyronie's disease (PD) METHODS: A total of 24 male 12-wk-old Sprague-Dawley rats were divided in three equal groups: sham, PD without treatment (TGFB) and PD treated with SVF (SVF) 1 day after disease induction...
September 29, 2018: BJU International
https://www.readbyqxmd.com/read/30237745/in-vitro-study-of-rrs%C3%A2-silisorg-ce-class-iii-medical-device-composed-of-silanol-effect-on-human-skin-fibroblasts-and-its-clinical-use
#11
Pierre-Antoine Deglesne, Rodrigo Arroyo, Javier Fidalgo López, Lilian Sepúlveda, Evgeniya Ranneva, Philippe Deprez
Introduction: Silanol (organic silicon) has been used for decades in the treatment of skin photoaging as it stabilizes and maintains skin structures through hydrogen bonding electrostatic interaction with extracellular matrix (ECM) proteins or glycosaminoglycans. Organic silicon-based products are often presented as silanol derivatives which are currently associated to other structural molecules such as orthohydroxybenzoate, carboxymethyl theophylline alginate, ascorbate, acetyltyrosine, sodium lactate or mannuronate...
2018: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/30213068/air-pollution-autophagy-and-skin-aging-impact-of-particulate-matter-pm-10-on-human-dermal-fibroblasts
#12
Seo-Yeon Park, Eun Jung Byun, Jeong Deuk Lee, Sungjoo Kim, Hei Sung Kim
A World Health Organization (WHO) report from 2016 states that over 3 million people die annually from air pollution, which places air pollution as the world's largest single environmental health risk factor. Particulate matter (PM) is one of the main components of air pollution, and there is increasing evidence that PM exposure exerts negative effects on the human skin. To see the impact of air pollution on skin aging, we analyzed the effect of PM exposure on human dermal fibroblasts (HDFs) with Western blot, enzyme-linked immunosorbent assay (ELISA), and gene analysis...
September 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30196014/cell-seeded-3d-scaffolds-as-in-vitro-models-for-electroporation
#13
Paola Brun, Monica Dettin, Luca Giovanni Campana, Fabrizio Dughiero, Paolo Sgarbossa, Clara Bernardello, Anna Lisa Tosi, Annj Zamuner, Elisabetta Sieni
Electroporation of cells is usually studied using cell suspensions or monolayer cultures. 3D scaffolds for cell culture have been recently designed in order to reproduce in vitro the complex and multifactorial environment experimented in vivo by cells. In fact, it is well known that 2D cell cultures are not able to simulate the complex interactions between the cells and their extracellular matrix (ECM). Recently, some examples of 3D models, like spheroids, have been investigated also in the electroporation field...
August 30, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/30194900/fabrication-of-a-bilayer-scaffold-for-small-diameter-vascular-applications
#14
Allison Goins, Vidhya Ramaswamy, Darcy Lichlyter, Antonio Webb, Josephine B Allen
One of the greatest challenges plaguing cardiovascular tissue engineering has been the development of a compliant vascular graft. In this work, we report the development of a synthetic vascular graft with compliance similar to native arteries at physiological pressures. A bilayer scaffold was fabricated from a solid polymeric lumen made from poly(1,8 octanediol-co-citrate) (POC) and a microfibrous medial layer composed of type I collagen, elastin, and POC. Mechanical analysis revealed dynamic compliance, ~6...
September 8, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/30183612/the-effect-of-atorvastatin-on-penile-intracavernosal-pressure-and-cavernosal-morphology-in-normocholesterolemic-rats
#15
Mustafa Suat Bolat, Mustafa Bakırtaş, Fatih Fırat, Ekrem Akdeniz, Önder Çınar, Fikret Erdemir
OBJECTIVE: A debate is open on the effects of lipid-lowering drugs on sexual function. We aimed to investigate the effect of atorvastatin use on penile intracavernosal pressure (ICP) and cavernosal morphology. MATERIAL AND METHODS: Fourteen mature male Sprague-Dawley-rats were randomly assigned to either the control group (which received standard food and water ad libitum) or the atorvastatin group (which received standard food, water, and statin) for twelwe weeks...
August 31, 2018: Turkish Journal of Urology
https://www.readbyqxmd.com/read/30181809/3d-hydrogel-breast-cancer-models-for-studying-the-effects-of-hypoxia-on-epithelial-to-mesenchymal-transition
#16
Ying Wang, Sameer Mirza, Shaohua Wu, Jiping Zeng, Wen Shi, Hamid Band, Vimla Band, Bin Duan
Solid tumors are 3D assemblies of cancer cells, together with multiple stromal cell types within an extracellular matrix. Yet, the vast majority of cell-based studies to characterize oncogenesis and discovery of new anti-cancer drugs is conducted using conventional 2D monolayer culture systems, where cells are grown on plastic substratum under normoxic environments. In current study, we generated 3D breast cancer cell culture platform consists of photocrosslinkable hydrogels and encapsulated isogenic primary (21PT) and a metastatic (21MT-2) breast cancer cell lines derived from the primary tumor and pleural effusion from the same patient...
August 14, 2018: Oncotarget
https://www.readbyqxmd.com/read/30165639/improved-long-term-durability-of-allogeneic-heart-valves-in-the-orthotopic-sheep-model
#17
Anna Christina Biermann, Julia Marzi, Eva Brauchle, Julian Lukas Wichmann, Christophe Theo Arendt, Valentina Puntmann, Eike Nagel, Sherif Abdelaziz, Andreas Gerhard Winter, Kelvin Gordon Mashader Brockbank, Shannon Layland, Katja Schenke-Layland, Ulrich Alfred Stock
OBJECTIVES: Frozen cryopreservation (FC) with the vapour phase of liquid nitrogen storage (-135°C) is a standard biobank technique to preserve allogeneic heart valves to enable a preferable allograft valve replacement in clinical settings. However, their long-term function is limited by immune responses, inflammation and structural degeneration. Ice-free cryopreserved (IFC) valves with warmer storage possibilities at -80°C showed better matrix preservation and decreased immunological response in preliminary short-term in vivo studies...
August 24, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/30138272/a-current-review-of-biologic-meshes-in-abdominal-wall-reconstruction
#18
Maurice Y Nahabedian, Michael Sosin, Parag Bhanot
It is well accepted that the use of mesh has facilitated and improved outcomes following repair of the complex abdominal hernias. Current mesh options include biologic, synthetic, and resorbable materials. The use of biologic materials for the repair and reinforcement of abdominal wall hernia has generated significant discussion. There are a variety of biologic mesh materials that are currently available that are derived from various sources including human, porcine, or bovine. All are processed for heterogeneous use, include variable amounts of collagen and elastin, and may or may not be crosslinked...
September 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/30116408/multiple-roles-of-tenascins-in-homeostasis-and-pathophysiology-of-aorta
#19
Kyoko Imanaka-Yoshida, Ken-Ichi Matsumoto
Tenascins are a family of large extracellular matrix (ECM) glycoproteins. Four family members (tenascin-C, -R, -X, and -W) have been identified to date. Each member consists of the same types of structural domains and exhibits time- and tissue-specific expression patterns, suggesting their specific roles in embryonic development and tissue remodeling. Among them, the significant involvement of tenascin-C (TNC) and tenascin-X (TNX) in the progression of vascular diseases has been examined in detail. TNC is strongly up-regulated under pathological conditions, induced by a number of inflammatory mediators and mechanical stress...
June 25, 2018: Annals of Vascular Diseases
https://www.readbyqxmd.com/read/30111362/missense-mutation-in-slit2-associated-with-congenital-myopia-anisometropia-connective-tissue-abnormalities-and-obesity
#20
Katherine Y Liu, Jesse D Sengillo, Gabriel Velez, Ruben Jauregui, Lynn Y Sakai, Irene H Maumenee, Alexander G Bassuk, Vinit B Mahajan, Stephen H Tsang
BACKGROUND: SLIT2 is a protein ligand for the Roundabout (ROBO) receptor and was found to play a major role in repulsive midline axon guidance in central nervous system development. Based on studies utilizing knockout models, it has been postulated that SLIT2 is important for preventing inappropriate axonal routing during mammalian optic chiasm development. METHODS: Case report. RESULTS: Here, we report a case of congenital myopia, anisometropia, and obesity in a patient with a SLIT2 point mutation...
August 15, 2018: Orphanet Journal of Rare Diseases
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