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Vitronectin

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https://www.readbyqxmd.com/read/28332572/xeno-free-culture-of-human-pluripotent-stem-cells-on-oligopeptide-grafted-hydrogels-with-various-molecular-designs
#1
Yen-Ming Chen, Li-Hua Chen, Meng-Pei Li, Hsing-Fen Li, Akon Higuchi, S Suresh Kumar, Qing-Dong Ling, Abdullah A Alarfaj, Murugan A Munusamy, Yung Chang, Giovanni Benelli, Kadarkarai Murugan, Akihiro Umezawa
Establishing cultures of human embryonic (ES) and induced pluripotent (iPS) stem cells in xeno-free conditions is essential for producing clinical-grade cells. Development of cell culture biomaterials for human ES and iPS cells is critical for this purpose. We designed several structures of oligopeptide-grafted poly (vinyl alcohol-co-itaconic acid) hydrogels with optimal elasticity, and prepared them in formations of single chain, single chain with joint segment, dual chain with joint segment, and branched-type chain...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28315346/inhibition-of-osteoporosis-by-the-%C3%AE-v%C3%AE-3-integrin-antagonist-of-rhodostomin-variants
#2
Tzu-Hung Lin, Rong-Sen Yang, Huang-Ju Tu, Houng-Chi Liou, Yen-Ming Lin, Woie-Jer Chuang, Wen-Mei Fu
Integrins are heterodimeric cell surface receptors that mediate cell-cell and cell-matrix interaction. The vitronectin and osteopontin receptor αvβ3 integrin has increased expression levels and is implicated in the adhesion, activation, and migration of osteoclasts on the bone surface as well as osteoclast polarization. αvβ3 integrin plays an important role in osteoclast differentiation and resorption. In addition, Arg-Gly-Asp (RGD)-containing peptides, small molecular inhibitors, and antibodies to αvβ3 integrin have been shown to inhibit bone resorption in vitro and in vivo...
March 14, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28299286/the-rickettsia-conorii-adr1-interacts-with-the-c-terminus-of-human-vitronectin-in-a-salt-sensitive-manner
#3
Abigail I Fish, Sean P Riley, Birendra Singh, Kristian Riesbeck, Juan J Martinez
Spotted fever group (SFG) Rickettsia species are inoculated into the mammalian bloodstream by hematophagous arthropods. Once in the bloodstream and during dissemination, the survival of these pathogens is dependent upon the ability of these bacteria to evade serum-borne host defenses until a proper cellular host is reached. Rickettsia conorii expresses an outer membrane protein, Adr1, which binds the complement inhibitory protein vitronectin to promote resistance to the anti-bacterial effects of the terminal complement complex...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28279737/targeting-tumors-with-cyclic-rgd-conjugated-lipid-nanoparticles-loaded-with-an-ir780-nir-dye-in-vitro-and-in-vivo-evaluation
#4
Jungyoon Choi, Emilie Rustique, Maxime Henry, Mélanie Guidetti, Véronique Josserand, Lucie Sancey, Jérôme Boutet, Jean-Luc Coll
Like several 50nm-large nanocarriers, lipid nanoparticles (LNPs) can passively accumulate in tumors through the Enhanced Permeability and Retention effect. In this study, we developed PEGylated LNPs loaded with IR780 iodide as a contrast agent for NIR fluorescence imaging and modified them with cyclic RGD peptides in order to target integrin avβ3. We demonstrate a specific targeting of the receptor with cRGD-LNPs but not with cRAD-LNP and standard LNP using HEK293(β3), HEK293(β3)-αvRFP, DU145 and PC3 cell lines...
March 6, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28256735/using-affinity-capillary-electrophoresis-and-computational-models-for-binding-studies-of-heparinoids-with-p-selectin-and-other-proteins
#5
Mona Mozafari, Shantheya Balasupramaniam, Lutz Preu, Sami El Deeb, Christian G Reiter, Hermann Wätzig
A fast and precise affinity capillary electrophoresis (ACE) method has been developed and applied for the investigation of the binding interactions between P-selectin and heparinoids as potential P-selectin inhibitors in the presence and absence of calcium ions. Furthermore, model proteins and vitronectin were used to appraise the binding behavior of P-selectin. The normalized mobility ratios (∆R/Rf ), which provided information about the binding strength and the overall charge of the protein-ligand complex, were used to evaluate the binding affinities...
March 3, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28247073/-proteome-analysis-of-undiluted-vitreous-humor-in-patients-with-branch-retinal-vein-occlusion
#6
I Dacheva, M Reich, M Nobl, K Ceglowska, J Wasiak, J Siwy, P Zürbig, H Mischak, F H J Koch, J Kopitz, F T A Kretz, T Tandogan, G U Auffarth, M J Koss
BACKGROUND: The pathophysiological mechanisms of macular edema secondary to branch retinal vein occlusion (BRVO) remain unclear. OBJECTIVES: To analyze the protein profile of human vitreous of patients with BRVO and to identify specific dysregulated proteins. MATERIALS AND METHODS: Undiluted vitreous humor samples from patients with treatment naïve BRVO and 15 controls with idiopathic floaters were analyzed in this clinical-experimental study using capillary electrophoresis coupled to a mass spectrometer (CE-MS) and tandem mass spectrometry (MS/MS)...
February 28, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/28236528/the-nature-and-consequence-of-vitronectin-interaction-in-the-non-compromised-contact-lens-wearing-eye
#7
Manpreet Cooner, Aisling Mann, Brian Tighe
PURPOSE: The aim of this work was to investigate the locus and extent of vitronectin (Vn) deposition on ex vivo contact lenses and to determine the influence of wear modality together with surface and bulk characteristics of the lens material. METHODS: The quantity and location of Vn deposition on the surfaces of contact lens materials was investigated using a novel on-lens cell attachment assay technique. RESULTS: Vn mapping showed that deposition resulted from lens-corneal interaction rather than solely from the tear film...
February 21, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28222616/plasma-biomarkers-for-the-identification-of-women-at-risk-for-early-onset-preeclampsia
#8
Aggeliki Kolialexi, George Th Tsangaris, Stavros Sifakis, Dimitris Gourgiotis, Aggeliki Katsafadou, Alexandra Lykoudi, Antonios Marmarinos, Danai Mavreli, Vassilis Pergialiotis, Dimitra Fexi, Ariadni Mavrou, George K Papaioanou, Nikolas Papantoniou
BACKGROUND: To identify potential biomarkers in the 1st trimester of pregnancy for the identification of women destined to develop early onset preeclampsia (EOPE). METHODS: Blood samples were obtained from pregnant women at 11-13 weeks of gestation. Women were followed up until delivery. Five samples from EOPE complicated pregnancies and 5 from unaffected ones were analysed using 2-DE and MALDI-TOF-TOF MS/MS. The altered expression of selected proteins was verified by ELISA in an extended sample cohort...
March 2017: Expert Review of Proteomics
https://www.readbyqxmd.com/read/28218242/protein-disulfide-isomerase-secretion-following-vascular-injury-initiates-a-regulatory-pathway-for-thrombus-formation
#9
Sheryl R Bowley, Chao Fang, Glenn Merrill-Skoloff, Barbara C Furie, Bruce Furie
Protein disulfide isomerase (PDI), secreted by platelets and endothelial cells on vascular injury, is required for thrombus formation. Using PDI variants that form mixed disulfide complexes with their substrates, we identify by kinetic trapping multiple substrate proteins, including vitronectin. Plasma vitronectin does not bind to αvβ3 or αIIbβ3 integrins on endothelial cells and platelets. The released PDI reduces disulfide bonds on plasma vitronectin, enabling vitronectin to bind to αVβ3 and αIIbβ3...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28209711/serotype-3-pneumococci-sequester-platelet-derived-human-thrombospondin-1-via-the-adhesin-and-immune-evasion-protein-hic
#10
Ulrike Binsker, Thomas P Kohler, Krystin Krauel, Sylvia Kohler, Johanna Habermeyer, Hansjörg Schwertz, Sven Hammerschmidt
Streptococcus pneumoniae serotype 3 strains emerge frequently within clinical isolates of invasive diseases. Bacterial invasion into deeper tissues is associated with colonization and immune evasion mechanisms. Thus, pneumococci express a versatile repertoire of surface proteins sequestering and interacting specifically with components of the human extracellular matrix and serum. Hic, a PspC-like pneumococcal surface protein possesses vitronectin and Factor H binding activity. Here, we show that heterologously expressed Hic domains interact, similar to the classical PspC molecule, with human matricellular thrombospondin-1 (hTSP-1)...
February 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28191759/heparin-promotes-cardiac-differentiation-of-human-pluripotent-stem-cells-in-chemically-defined-albumin-free-medium-enabling-consistent-manufacture-of-cardiomyocytes
#11
Yongshun Lin, Kaari L Linask, Barbara Mallon, Kory Johnson, Michael Klein, Jeanette Beers, Wen Xie, Yubin Du, Chengyu Liu, Yinzhi Lai, Jizhong Zou, Mark Haigney, Hushan Yang, Mahendra Rao, Guokai Chen
Cardiomyocytes can be differentiated from human pluripotent stem cells (hPSCs) in defined conditions, but efficient and consistent cardiomyocyte differentiation often requires expensive reagents such as B27 supplement or recombinant albumin. Using a chemically defined albumin-free (E8 basal) medium, we identified heparin as a novel factor that significantly promotes cardiomyocyte differentiation efficiency, and developed an efficient method to differentiate hPSCs into cardiomyocytes. The treatment with heparin helped cardiomyocyte differentiation consistently reach at least 80% purity (up to 95%) from more than 10 different hPSC lines in chemically defined Dulbecco's modified Eagle's medium/F-12-based medium on either Matrigel or defined matrices like vitronectin and Synthemax...
February 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28190785/crosstalk-between-insulin-like-growth-factor-igf-receptor-and-integrins-through-direct-integrin-binding-to-igf1
#12
Yoshikazu Takada, Yoko K Takada, Masaaki Fujita
It has been generally accepted that integrin cell adhesion receptors are involved in growth factor signaling (integrin-growth factor crosstalk), since antagonists to integrins often suppress growth factor signaling. Partly because integrins have been originally identified as cell adhesion receptors to extracellular matrix (ECM) proteins, current models of the crosstalk between IGF1 and integrins propose that ECM ligands (e.g., vitronectin) bind to integrins and IGF1 binds to IGF receptor type 1 (IGF1R), and two separate signals merge inside the cells...
February 3, 2017: Cytokine & Growth Factor Reviews
https://www.readbyqxmd.com/read/28186697/complement-activated-vitronectin-enhances-the-invasion-of-non-phagocytic-cells-by-bacterial-pathogens-burkholderia-and-klebsiella
#13
Yi Han Tan, Akshamal Gamage, Yunn-Hwen Gan
Burkholderia pseudomallei is a serum-resistant Gram-negative bacterium capable of causing disseminated infections with metastatic complications. However, their interaction with non-phagocytic cells is poorly understood. We observed that exposure of B. pseudomallei and the closely related yet avirulent B. thailandensis to human plasma increased epithelial cell invasion by >20 fold. Enhanced invasion was primarily driven by a plasma factor which required a functional complement cascade, but surprisingly, was downstream of C3 mediated opsonisation...
February 10, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28183283/comparative-proteomics-analysis-of-teleost-intermuscular-bones-and-ribs-provides-insight-into-their-development
#14
Chun-Hong Nie, Shi-Ming Wan, Tea Tomljanovic, Tomislav Treer, Chung-Der Hsiao, Wei-Min Wang, Ze-Xia Gao
BACKGROUND: Intermuscular bones (IBs) and ribs both are a part of skeletal system in teleosts, but with different developing process. The chemical composition of fish IBs and ribs as well as the underlying mechanism about their development have not been investigated. In the present study, histological structures showed that one bone cavity containing osteoclasts were existed in ribs, but not in IBs of Megalobrama amblycephala. We constructed the first proteomics map for fish bones including IBs and ribs, and identified the differentially expressed proteins between IBs and ribs through iTRAQ LC-MS/MS proteomic analysis...
February 10, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28150868/identification-of-second-arginine-glycine-aspartic-acid-motif-of-ovine-vitronectin-as-the-complement-c9-binding-site-and-its-implication-in-bacterial-infection
#15
Prasada Rao T, Lakshmi Prasanth T, Parvathy R, Murugavel S, Karuna Devi, Paritosh Joshi
Vitronectin (Vn), a multifunctional protein of blood and extracellular matrix interacts with complement C9. This interaction may modulate innate immunity. Details of Vn-C9 interaction are limited. An assessment of Vn-C9 interaction was made employing goat homologous system. Vn binding to C9 was observed in three different assays. Using recombinant fragments, the C9 binding was mapped to the N-terminus of Vn. Site directed mutagenesis was performed to alter the second RGD sequence (RGD-2) of Vn. Change of R to G or D to A in RGD-2 caused significant decrease in Vn binding to C9 whereas change of R to G in the first RGD motif (RGD-1) had no effect on Vn binding to C9...
February 2, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28143632/extracellular-like-matrices-and-leukaemia-inhibitory-factor-for-in-vitro-culture-of-human-primordial-follicles
#16
Assiel J Younis, Galit Lerer-Serfaty, Dana Stav, Bethsabee Sabbah, Tzippy Shochat, Gania Kessler-Icekson, Muayad A Zahalka, Michal Shachar-Goldenberg, Avi Ben-Haroush, Benjamin Fisch, Ronit Abir
The possibility of maturing human primordial follicles in vitro would assist fertility restoration without the danger of reseeding malignancies. Leukaemia inhibitory factor (LIF) and certain culture matrices may promote human follicular growth. The present study compared human primordial follicular growth on novel culture matrices, namely human recombinant vitronectin (hrVit), small intestine submucosa (SIS), alginate scaffolds and human recombinant virgin collagen bioengineered in tobacco plant lines (CollPlant)...
February 1, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28134277/efficient-adhesion-culture-of-human-pluripotent-stem-cells-using-laminin-fragments-in-an-uncoated-manner
#17
Takamichi Miyazaki, Takehisa Isobe, Norio Nakatsuji, Hirofumi Suemori
We describe highly effective adhesion culture of human pluripotent stem cells (hPSCs) using laminin fragments without precoating. Culture substrates have been generally thought to exert a cell adhesion effect when they are precoated onto culture vessels. However, simple addition of laminin fragments to a cell suspension during passaging accelerated the adhesion of single dissociated hPSCs onto culture vessels that were not precoated with any culture substrate. Interestingly, similar to conventional precoating, the uncoated addition of laminin fragments supported robust adhesion of single hPSCs and maximum adhesion at a much lower concentration compared with precoating...
January 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28133907/discovery-of-gastric-cancer-specific-biomarkers-by-the-application-of-serum-proteomics
#18
Moon-Won Yoo, Jisook Park, Hye-Seung Han, Yeo-Min Yun, Jeong Won Kang, Do-Young Choi, Joon Won Lee, Jae Hun Jung, Kyung-Yung Lee, Kwang Pyo Kim
Current diagnostic markers for gastric cancer are not sufficiently specific or sensitive for use in clinical practice. The aims of this study are to compare the proteomes of serum samples from patients with gastric cancers and normal controls, and to develop useful tumor markers of gastric cancer by quantitative proteomic analysis. We identified a total of 388 proteins with a ≤1% false discovery rate and with at least two unique peptides from the sera of each group. Among them, 215, 251, and 260 proteins were identified in serum samples of patients in an advanced cancer group, early cancer group, and normal control group, respectively...
January 29, 2017: Proteomics
https://www.readbyqxmd.com/read/28128374/the-influence-of-surface-modified-poly-l-lactic-acid-films-on-the-differentiation-of-human-monocytes-into-macrophages
#19
Clara R Correia, Joana Gaifem, Mariana B Oliveira, Ricardo Silvestre, João F Mano
Macrophages play a crucial role in the biological performance of biomaterials, as key factors in defining the optimal inflammation-healing balance towards tissue regeneration and implant integration. Here, we investigate how different surface modifications performed on poly(l-lactic acid) (PLLA) films would influence the differentiation of human monocytes into macrophages. We tested PLLA films without modification, surface-modified by plasma treatment (pPLLA) or by combining plasma treatment with different coating materials, namely poly(l-lysine) and a series of proteins from the extracellular matrix: collagen I, fibronectin, vitronectin, laminin and albumin...
January 27, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28121998/rheumatic-heart-disease-and-myxomatous-degeneration-differences-and-similarities-of-valve-damage-resulting-from-autoimmune-reactions-and-matrix-disorganization
#20
Carlo de Oliveira Martins, Lea Demarchi, Frederico Moraes Ferreira, Pablo Maria Alberto Pomerantzeff, Carlos Brandao, Roney Orismar Sampaio, Guilherme Sobreira Spina, Jorge Kalil, Edecio Cunha-Neto, Luiza Guilherme
Autoimmune inflammatory reactions leading to rheumatic fever (RF) and rheumatic heart disease (RHD) result from untreated Streptococcus pyogenes throat infections in individuals who exhibit genetic susceptibility. Immune effector mechanisms have been described that lead to heart tissue damage culminating in mitral and aortic valve dysfunctions. In myxomatous valve degeneration (MXD), the mitral valve is also damaged due to non-inflammatory mechanisms. Both diseases are characterized by structural valve disarray and a previous proteomic analysis of them has disclosed a distinct profile of matrix/structural proteins differentially expressed...
2017: PloS One
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