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Collagen VI

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https://www.readbyqxmd.com/read/29349780/protective-effect-of-bled-exposed-conditioned-media-on-cell-injury
#1
Phil-Sun Oh, Eun-Mi Kim, Minjoo Kim, In Sun Kim, Yeon-Hee Han, SeokTae Lim, Myung-Hee Sohn, Myoung-Hwan Ko, Hwan-Jeong Jeong
Previous studies have reported that 450 nm blue light emitting diode (BLED) induces apoptosis through a mitochondria-mediated pathway in cancer cells and reduces the early stage tumor growth. The present study was performed to determine the effects of BLED-irradiated cell metabolites on cell injury. Our results showed that conditioned medium (CM) from cells irradiated with low-dose BLED (LCM) inhibited apoptosis and increased cell survival. Cell protection-related proteins were identified in cell metabolites of CM and LCM using 2-DE and MALDI-TOF analysis...
January 19, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29346490/composition-architecture-and-functional-implications-of-the-connective-tissue-network-of-the-extraocular-muscles
#2
Linda K McLoon, André Vicente, Krysta R Fitzpatrick, Mona Lindström, Fatima Pedrosa Domellöf
Purpose: We examined the pattern and extent of connective tissue distribution in the extraocular muscles (EOMs) and determined the ability of the interconnected connective tissues to disseminate force laterally. Methods: Human EOMs were examined for collagens I, III, IV, and VI; fibronectin; laminin; and elastin using immunohistochemistry. Connective tissue distribution was examined with scanning electron microscopy. Rabbit EOMs were examined for levels of force transmission longitudinally and transversely using in vitro force assessment...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29336501/uncontrolled-asthmatics-have-increased-fceri-and-tgf-%C3%AE-positive-mctc-mast-cells-and-collagen-vi-in-the-alveolar-parenchyma
#3
Cecilia K Andersson, Maria Weitoft, Kristina Rydell-Törmänen, Leif Bjermer, Gunilla Westergren-Thorsson, Jonas S Erjefält
BACKGROUND: Asthma has been associated with increased collagen deposition in both conducting airways and alveolar parenchyma. Mast cells (MCs) are key effector cells in asthma, and have the ability to affect collagen synthesis. However, the link between clinical control and changes in bronchial and alveolar MC phenotypes and specific collagens in controlled and uncontrolled asthma remains unknown. OBJECTIVE: To investigate MC phenotypes in correlation to deposition of specific collagen subtypes in patients with controlled and uncontrolled asthma as well as to healthy controls...
January 16, 2018: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29313037/soluble-collagen-vi-treatment-enhances-mesenchymal-stem-cells-expansion-for-engineering-cartilage
#4
Piera Smeriglio, Jieun Lee, Nidhi Bhutani
Bone Marrow-derived mesenchymal stem cells (BM-MSC) are an attractive source for cell-based therapies in cartilage injury owing to their efficient differentiation into chondrocytes and their immune-suppressive abilities. However, their clinical use is hampered by a scarcity of cells leading to compromised efficacy. While expansion of human MSC ex vivo can potentially overcome the scarcity of cells, current methods lead to a rapid loss of the stem cell properties. In this study, we report soluble Collagen VI (cartilage pericellular matrix component) as a potential biologic that can expand the MSC population while maintaining the stem cell phenotype as confirmed by expression of the stem cell markers CD105 and CD90...
September 2017: Bioengineering & Translational Medicine
https://www.readbyqxmd.com/read/29306997/extracellular-matrix-molecules-and-their-potential-contribution-to-the-function-of-transplanted-pancreatic-islets
#5
REVIEW
L Alberto Llacua, Marijke M Faas, Paul de Vos
Extracellular matrix (ECM) molecules are responsible for structural and biochemical support, as well as for regulation of molecular signalling and tissue repair in many organ structures, including the pancreas. In pancreatic islets, collagen type IV and VI, and laminins are the most abundant molecules, but other ECM molecules are also present. The ECM interacts with specific combinations of integrin α/β heterodimers on islet cells and guides many cellular processes. More specifically, some ECM molecules are involved in beta cell survival, function and insulin production, while others can fine tune the susceptibility of islet cells to cytokines...
January 6, 2018: Diabetologia
https://www.readbyqxmd.com/read/29296791/fibrin-and-d-dimer-bind-to-monomeric-gpvi
#6
Marie-Blanche Onselaer, Alexander T Hardy, Clare Wilson, Ximena Sanchez, Amir K Babar, Jeanette L C Miller, Callum N Watson, Stephanie K Watson, Arkadiusz Bonna, Helen Philippou, Andrew B Herr, Diego Mezzano, Robert A S Ariëns, Steve P Watson
Fibrin has recently been shown to activate platelets through the immunoglobulin receptor glycoprotein VI (GPVI). In the present study, we show that spreading of human platelets on fibrin is abolished in patients deficient in GPVI, confirming that fibrin activates human platelets through the immunoglobulin receptor. Using a series of proteolytic fragments, we show that D-dimer, but not the E fragment of fibrin, binds to GPVI and that immobilized D-dimer induces platelet spreading through activation of Src and Syk tyrosine kinases...
August 22, 2017: Blood Advances
https://www.readbyqxmd.com/read/29295843/gpvi-signaling-is-compromised-in-newly-formed-young-platelets-after-acute-thrombocytopenia-in-mice
#7
Shuchi Gupta, Deya Cherpokova, Markus Spindler, Martina Morowski, Markus Bender, Bernhard Nieswandt
At sites of vascular injury, exposed subendothelial collagens trigger platelet activation and thrombus formation by interacting with the immunoreceptor tyrosine-based activation motif (ITAM)-coupled glycoprotein (GP) VI on the platelet surface. Platelets are derived from the cytoplasm of megakaryocytes (MKs), which extend large proplatelets into bone marrow (BM) sinusoids that are then released into the blood stream where the final platelet sizing and maturation occurs. The mechanisms that prevent activation of MKs and forming proplatelets in the collagen-rich BM environment remain largely elusive...
January 2, 2018: Blood
https://www.readbyqxmd.com/read/29285457/osteogenesis-imperfecta
#8
REVIEW
Justin Easow Sam, Mala Dharmalingam
Osteogenesis imperfecta is a common heritable connective tissue disorder. Nearly ninety percent are due to Type I collagen mutations. Type I-IV are autosomal dominant, and Type VI-XIII are autosomal recessive. They are Graded 1-5 based on severity. Genomic testing is done by collagen analysis from fibroblasts. The mainstay of treatment is bisphosphonate therapy. The prognosis is variable.
November 2017: Indian Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29283096/the-role-of-topical-thymoquinone-in-the-treatment-of-acute-otitis-externa-an-experimental-study-in-rats
#9
Hasan Demirel, Cengiz Arlı, Tümay Özgür, Melek İnci, Recep Dokuyucu
OBJECTIVE: The aim of this experimental study was to compare the dose-related effect of topical thymoquinone (TQ) with other topical agents used in the management of acute otitis externa (AOE) in a rat model. MATERIALS AND METHODS: Forty-eight male Wistar albino rats were divided into six groups each with eight rats per group. Group I was the control group with no external otitis, whereas external otitis were created in the other five groups (study groups). Dexamethasone, 0...
December 14, 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/29277723/collagen-vi-disorders-insights-on-form-and-function-in-the-extracellular-matrix-and-beyond
#10
REVIEW
Shireen R Lamandé, John F Bateman
Mutations in the three canonical collagen VI genes, COL6A1, COL6A2 and COL6A3, cause a spectrum of muscle disease from Bethlem myopathy at the mild end to the severe Ullrich congenital muscular dystrophy. Mutations can be either dominant or recessive and the resulting clinical severity is influenced by the way mutations impact the complex collagen VI assembly process. Most mutations are found towards the N-terminus of the triple helical collagenous domain and compromise extracellular microfibril assembly. Outside the triple helix collagen VI is highly polymorphic and discriminating mutations from rare benign changes remains a major diagnostic challenge...
December 22, 2017: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29244830/transcriptome-profiling-identifies-regulators-of-pathogenesis-in-collagen-vi-related-muscular-dystrophy
#11
Russell J Butterfield, Diane M Dunn, Ying Hu, Kory Johnson, Carsten G Bönnemann, Robert B Weiss
OBJECTIVES: The collagen VI related muscular dystrophies (COL6-RD), Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy (BM) are among the most common congenital muscular dystrophies and are characterized by distal joint laxity and a combination of distal and proximal joint contractures. Inheritance can be dominant negative (DN) or recessive depending on the type and location of the mutation. DN mutations allow incorporation of abnormal chains into secreted tetramers and are the most commonly identified mutation type in COL6-RD...
2017: PloS One
https://www.readbyqxmd.com/read/29242851/in-depth-ptdins-3-4-5-p3-signalosome-analysis-identifies-dapp1-as-a-negative-regulator-of-gpvi-driven-platelet-function
#12
Tom N Durrant, James L Hutchinson, Kate J Heesom, Karen E Anderson, Len R Stephens, Phillip T Hawkins, Aaron J Marshall, Samantha F Moore, Ingeborg Hers
The class I phosphoinositide 3-kinase (PI3K) isoforms play important roles in platelet priming, activation, and stable thrombus formation. Class I PI3Ks predominantly regulate cell function through their catalytic product, the signaling phospholipid phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P3], which coordinates the localization and/or activity of a diverse range of binding proteins. Notably, the complete repertoire of these class I PI3K effectors in platelets remains unknown, limiting mechanistic understanding of class I PI3K-mediated control of platelet function...
June 13, 2017: Blood Advances
https://www.readbyqxmd.com/read/29229941/urinary-endotrophin-predicts-disease-progression-in-patients-with-chronic-kidney-disease
#13
Daniel Guldager Kring Rasmussen, Anthony Fenton, Mark Jesky, Charles Ferro, Peter Boor, Martin Tepel, Morten Asser Karsdal, Federica Genovese, Paul Cockwell
Renal fibrosis is the central pathogenic process in progression of chronic kidney disease (CKD). Collagen type VI (COL VI) is upregulated in renal fibrosis. Endotrophin is released from COL VI and promotes pleiotropic pro-fibrotic effects. Kidney disease severity varies considerably and accurate information regarding CKD progression may improve clinical decisions. We tested the hypothesis that urinary endotrophin derived during COL VI deposition in fibrotic human kidneys is a marker for progression of CKD in the Renal Impairment in Secondary Care (RIISC) cohort, a prospective observational study of 499 CKD patients...
December 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29220597/dietary-nacl-affects-bleomycin-induced-lung-fibrosis-in-mice
#14
Wensheng Chen, Darrell Pilling, Richard H Gomer
PURPOSE: High levels of NaCl in the diet are associated with both cardiac and renal fibrosis, but whether salt intake affects pulmonary fibrosis has not been examined. AIM OF THE STUDY: To test the hypothesis that salt intake might affect pulmonary fibrosis. MATERIALS AND METHODS: Mice were fed low, normal, or high salt diets for 2 weeks, and then treated with oropharyngeal bleomycin to induce pulmonary fibrosis, or oropharyngeal saline as a control...
December 8, 2017: Experimental Lung Research
https://www.readbyqxmd.com/read/29219948/asperosaponin-vi-promotes-angiogenesis-and-accelerates-wound-healing-in-rats-via-up-regulating-hif-1%C3%AE-vegf-signaling
#15
Cheng-Gui Wang, Yi-Ting Lou, Min-Ji Tong, Li-Lian Zhang, Zeng-Jie Zhang, Yong-Zeng Feng, Shi Li, Hua-Zi Xu, Cong Mao
Wound therapy remains a clinical challenge due to the complexity of healing pathology and high demand of achieving functional and aesthetically satisfactory scars. Newly formed blood vessels are essential for tissue repair since they can support cells at the wound site with nutrition and oxygen. In this study, we investigated the effects of Asperosaponin VI (ASA VI) isolated from a traditional Chinese medicine, the root of Dipsacus asper Wall, in promoting angiogenesis, as well as its function in wound therapeutics...
December 7, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/29207129/identification-of-susceptibility-loci-for-thoracic-ossification-of-the-posterior-longitudinal-ligament-by-whole-genome-sequencing
#16
Peng Wang, Xiao Liu, Bin Zhu, Yunlong Ma, Lei Yong, Ze Teng, Yongqiang Wang, Chen Liang, Guanping He, Xiaoguang Liu
Ossification of the posterior longitudinal ligament (OPLL) is a myelopathy commonly observed in the cervical spine. By contrast, thoracic OPLL (T‑OPLL) is rare but more severe. Previous studies have identified several polymorphisms in osteogenic genes that are associated with the occurrence and development of cervical OPLL. However, few genetic studies have evaluated T‑OPLL. The present study aimed to identify the genetic factors for OPLL by performing whole‑genome sequencing (WGS) in 30 unrelated northern Chinese Han patients with T‑OPLL...
November 28, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29202744/biomarkers-of-collagen-turnover-are-related-to-annual-change-in-fev1-in-patients-with-chronic-obstructive-pulmonary-disease-within-the-eclipse-study
#17
Diana J Leeming, Inger Byrjalsen, Jannie M B Sand, Asger R Bihlet, Peter Lange, Ruth Thal-Singer, Bruce E Miller, Morten A Karsdal, Jørgen Vestbo
BACKGROUND: Change in forced expiratory volume in one second (FEV1) is important for defining severity of chronic obstructive pulmonary disease (COPD). Serological neoepitope markers of collagen turnover may predict rate of change in FEV1. METHODS: One thousand COPD subjects from the observational, multicentre, three-year ECLIPSE (Evaluation of COPD Longitudinally to Identify Predictive Surrogate Endpoints) study (NCT00292552, trial registration in February 2006) were included...
December 4, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/29196262/collagen-vi-suppresses-fibronectin-induced-enteric-neural-crest-cell-migration-by-downregulation-of-focal-adhesion-proteins
#18
Shoichi Nishida, Hisayoshi Yoshizaki, Yoshitomo Yasui, Tsuyoshi Kuwahara, Etsuko Kiyokawa, Miyuki Kohno
The enteric nervous system (ENS) is a network of neurons and glia that are derived from enteric neural crest cells (ENCCs) and essential for regulating peristaltic activity of the colon. ENCCs migrate along the gastrointestinal tract to form the ENS, and disruption of ENCC motility leads to ENS disorders, such as Hirschsprung's disease. Previous ENCC-transplant experiments show that ENCCs can invade into isolated mouse intestines by age E13.5, but not after E15.5. We hypothesized that altered age-specific micro-environments in the intestine are responsible for ENCC invasion/migration...
January 1, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29187378/platelet-glycoprotein-vi-aids-in-local-immunity-during-gram-negative-pneumonia-derived-sepsis
#19
Theodora A M Claushuis, Alex F de Vos, Bernhard Nieswandt, Louis Boon, Joris J T H Roelofs, Onno J de Boer, Cornelis J van 't Veer, Tom van der Poll
Platelet collagen receptor glycoprotein(GP)VI and podoplanin receptor C-type lectin-like receptor (CLEC-)2 are receptors implicated in platelet activation that both signal via an immunoreceptor-tyrosine-based activation motif. Platelets are necessary for host defense and prevention of hemorrhage during sepsis, but the role of platelet GPVI and CLEC2 herein is unknown. To investigate this we infected mice depleted of platelet GPVI or CLEC2 by antibody treatment or GPVI-/- mice with the common human sepsis pathogen Klebsiella pneumoniae via the airways to induce pneumonia derived sepsis...
November 29, 2017: Blood
https://www.readbyqxmd.com/read/29177123/recent-advances-in-adhesive-bonding-the-role-of-biomolecules-nanocompounds-and-bonding-strategies-in-enhancing-resin-bonding-to-dental-substrates
#20
Eliseu A Münchow, Marco C Bottino
Purpose of review: To present an overview on the main agents (i.e., biomolecules and nanocompounds) and/or strategies currently available to amplify or stabilize resin-dentin bonding. Recent findings: According to studies retrieved for full text reading (2014-2017), there are currently six major strategies available to overcome resin-dentin bond degradation: (i) use of collagen crosslinking agents, which may form stable covalent bonds with collagen fibrils, thus strengthening the hybrid layer; (ii) use of antioxidants, which may allow further polymerization reactions over time; (iii) use of protease inhibitors, which may inhibit or inactivate metalloproteinases; (iv) modification of the bonding procedure, which may be performed by using the ethanol wet-bonding technique or by applying an additional adhesive (hydrophobic) coating, thereby strengthening the hybrid layer; (v) laser treatment of the substrate prior to bonding, which may cause specific topographic changes in the surface of dental substrates, increasing bonding efficacy; and (vi) reinforcement of the resin matrix with inorganic fillers and/or remineralizing agents, which may positively enhance physico-mechanical properties of the hybrid layer...
September 2017: Current Oral Health Reports
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