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Caiyun Liu, Like Qu, Chuanke Zhao, Chengchao Shou
BACKGROUND: Increasing evidence reveals a significant correlation between gamma-synuclein (SNCG) level and tumor invasion and metastasis in various human cancers. Our previous investigation showed that SNCG could secrete into extracellular environment and promoted tumor cell motility, but the mechanism is unknown. METHODS: The membrane binding ability of SNCG was characterized by immunohistochemical staining, immunofluorescence staining and fractionation of colorectal cancer (CRC) cell membrane...
June 15, 2018: Journal of Experimental & Clinical Cancer Research: CR
Thomas A Horbett
Fibrinogen (Fg) adsorption is an important mechanism underlying cell adhesion to biomaterials and was the major focus of the author's research career. This article summarizes our work on Fg adsorption, with citations of related work as appropriate. The molecular properties of Fg that promote adsorption and cell adhesion will be described. In addition, the adsorption behavior of Fg from buffer, binary solutions with other proteins, and blood plasma will be discussed, including the Vroman effect. Studies of platelet adhesion to surfaces preadsorbed with blood plasmas selectively deficient in Fg, vitronectin (Vn), fibronectin (Fn), or von Willebrand's factor (vWf) will be reviewed...
June 12, 2018: Journal of Biomedical Materials Research. Part A
Joanna Włodek, Anna Pituch-Noworolska
The extracellular matrix (ECM) is a dynamic environment involved in the regulation of haematopoiesis. A crucial role of this structure is the promotion of proliferation, maturation, and differentiation of haematopoietic stem cells (HSC), and adhesion and migration of HSC in bone marrow. In the present study the effect of ECM proteins (fibronectin, collagens, laminin, thrombospondin, and vitronectin) on proliferation and apoptosis of acute lymphoblastic leukaemia cells isolated from acute lymphoblastic leukaemia (ALL) patients (<i><i><i><i><i>in vitro</i></i></i></i></i>) was assessed...
2018: Polish Journal of Pathology: Official Journal of the Polish Society of Pathologists
Hung-Yun Lin, Shaker A Mousa, Paul J Davis
Integrin αvβ3 is one of the 24 heterodimeric structural proteins of the plasma membrane of animal cells. The extracellular domain of αvβ3 comprises about 80% of its mass and is devoted largely to interactions with extracellular matrix (ECM) proteins, such as vitronectin and fibronectin, and cell-cell interaction. The binding of specific ECM proteins is conveyed to the cell interior by signal transduction. In the past decade, integrin αvβ3 has been shown to bind small molecules, such as nonprotein hormones-thyroid hormone analogues and dihydrotestosterone-and the stilbene, resveratrol...
2018: Methods in Molecular Biology
Hwa-Young Kim, Song Baek, Na Rae Han, Eunsong Lee, Choon-Keun Park, Seung Tae Lee
In vitro expansion of undifferentiated porcine primed embryonic stem (ES) cells is facilitated by use of non-cellular niches that mimic three-dimensional (3D) microenvironments enclosing an inner cell mass of porcine blastocysts. Therefore, we investigated the integrin heterodimers on the surface of undifferentiated porcine primed ES cells for the purpose of developing a non-cellular niche to support in vitro maintenance of the self-renewal ability of porcine primed ES cells. Immunocytochemistry and a fluorescence immunoassay were performed to assess integrin α and β subunit levels, and attachment and antibody inhibition assays were used to evaluate the function of integrin heterodimers...
May 29, 2018: Cell Biology International
N Araújo-Gomes, F Romero-Gavilán, I Lara-Sáez, F Elortza, M Azkargorta, I Iloro, M Martínez-Ibañez, J J Martín de Llano, M Gurruchaga, I Goñi, J Suay, A M Sánchez-Pérez
Osseointegration, including the foreign body reaction to biomaterials, is an immune-modulated, multifactorial, and complex healing process in which various cells and mediators are involved. The buildup of the osseointegration process is immunological and inflammation-driven, often triggered by the adsorption of proteins on the surfaces of the biomaterials and complement activation. New strategies for improving osseointegration use coatings as vehicles for osteogenic biomolecules delivery from implants. Natural polymers, such as gelatin, can mimic collagen I and enhance the biocompatibility of a material...
May 21, 2018: Journal of Tissue Engineering and Regenerative Medicine
Yan Cao, Xinyu Li, Chong Lu, Xiaorong Zhan
The World Health Organization (WHO) estimates that approximately 300 million people will suffer from diabetes mellitus by 2025. Type 2 diabetes mellitus (T2DM) is much more prevalent. T2DM comprises approximately 90% of diabetes mellitus cases, and it is caused by a combination of insulin resistance and inadequate compensatory insulin secretory response. In this study, we aimed to compare the plasma vitronectin (VN) levels between patients with T2DM and insulin resistance (IR) and healthy controls. Seventy patients with IR and 70 age- and body mass index (BMI)-matched healthy controls were included in the study...
May 18, 2018: Endocrine Journal
Roshanak Aslebagh, Devika Channaveerappa, Kathleen F Arcaro, Costel C Darie
Breast Cancer (BC) remains a major cause of mortality, and early detection is considered important for reducing BC-associated deaths. Early detection of BC is challenging in young women, due to the limitations of mammography on the dense breast tissue of young women. We recently reported results of a pilot proteomics study, using one-dimensional polyacrylamide gel electrophoresis (1D-PAGE) and mass spectrometry (MS) to investigate differences in milk proteins from women with and without BC. Here, we applied two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) and MS to compare the protein pattern in milk from the breasts of a single woman who was diagnosed with BC in one breast 24 months after donating her milk...
May 13, 2018: Electrophoresis
Liqing Song, Mohammad Faisal Ahmed, Yan Li, Changchun Zeng, Yan Li
Auxetic scaffolds, i.e. scaffolds that can display negative Poisson's ratio, have unique physical properties and can expand transversally when axially strained or contract under compression. Auxetic materials have been used for bioprostheses and artery stents due to the enhanced compressive strength and shear stiffness. In vascular tissue engineering, auxetic scaffolds allow the widening of blood vessels when blood flows through (creating compressive stress) to prevent the blockage. However, the influence of auxetic materials on the cellular fate decision in local environment is unclear...
May 10, 2018: Journal of Tissue Engineering and Regenerative Medicine
Annj Zamuner, Paola Brun, Michele Scorzeto, Giuseppe Sica, Ignazio Castagliuolo, Monica Dettin
Engineered scaffolds for bone tissue regeneration are designed to promote cell adhesion, growth, proliferation and differentiation. Recently, covalent and selective functionalization of glass and titanium surfaces with an adhesive peptide (HVP) mapped on [351-359] sequence of human Vitronectin allowed to selectively increase osteoblast attachment and adhesion strength in in vitro assays, and to promote osseointegration in in vivo studies. For the first time to our knowledge, in this study we investigated the resistance of adhesion sequences to proteolytic digestion: HVP was completely cleaved after 5 h...
September 2017: Bioactive Materials
Farzaneh Kordbacheh, Thomas J Carruthers, Anna Bezos, Marie Oakes, Lauren Du Fall, Charles H Hocart, Christopher R Parish, Michael A Djordjevic
Excessive or insufficient angiogenesis is associated with major classes of chronic disease. Although less studied, small molecules which can promote angiogenesis are being sought as potential therapeutics for cardiovascular and peripheral arterial disease and stroke. Here we describe a bioassay-directed discovery approach utilising size exclusion and liquid chromatography to purify components of soybean xylem sap that have pro-angiogenic activity. Using high resolution accurate mass spectrometry and nuclear magnetic resonance spectroscopy, the structure of two pro-angiogenic molecules (FK1 and FK2) were identified as erythro-guaiacylglycerol-8-O-4'-(coniferyl alcohol) ether (eGGCE), and threo-guaiacylglycerol-8-O-4'-(coniferyl alcohol) ether (tGGCE)...
2018: PloS One
Ayaka Abe, Kei Hashimoto, Ayumi Akiyama, Momoe Iida, Natsumi Ikeda, Ayana Hamano, Riho Watanabe, Yokichi Hayashi, Yasunori Miyamoto
Vitronectin (VN), one of the extracellular matrix proteins, controls the maturation of cerebellar granule cells (CGCs) through the promotion of the initial differentiation stage progress. However, the receptors of VN in the initial differentiation stage of CGC precursors (CGCPs) have not been clarified. In this study, we characterized the receptor candidates for VN in CGCPs. First, we confirmed that αvβ3 and αvβ5 integrins, which are receptor candidates for VN, were co-localized with VN in the developing cerebellum and primary cultured CGCPs...
April 24, 2018: Brain Research
F Ravanetti, F Gazza, D D'Arrigo, G Graiani, A Zamuner, M Zedda, E Manfredi, M Dettin, A Cacchioli
Osteoblast cell adhesion to the extracellular matrix is established through two main pathways: one is mediated by the binding between integrin and a minimal adhesion sequence (RGD) on the extracellular protein, the other is based on the interactions between transmembrane proteoglycans and heparin-binding sequences found in many matrix proteins. The aim of this study is the evaluation in an in vivo endosseous implant model of the early osteogenic response of the peri-implant bone to a biomimetic titanium surface functionalized with the retro-inverso 2DHVP peptide, an analogue of Vitronectin heparin binding site...
July 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
Lorenzo Sernissi, Luciano Ricci, Dina Scarpi, Francesca Bianchini, Daniela Arosio, Alessandro Contini, Ernesto G Occhiato
A stereodivergent strategy was devised to obtain enantiopure cis and trans 5-aminopipecolic acids (5-APAs) in suitably protected forms to be employed in peptide synthesis as conformationally constrained α- and δ-amino acids. The cis isomer was used as a δ-amino acid to construct a cyclic RGD-containing peptidomimetic, the ability of which to compete with biotinylated vitronectin for binding with the isolated αVβ3 integrin was measured (IC50 = 4.2 ± 0.9 nM). A complete 1H NMR and computational conformational analysis was performed to elucidate the reasons for the high affinity of this cyclic peptidomimetic in comparison with cilengitide...
May 9, 2018: Organic & Biomolecular Chemistry
Saskia Roesch, Thomas Lindner, Max Sauter, Anastasia Loktev, Paul Flechsig, Martin Müller, Walter Mier, Rolf Warta, Gerhard Dyckhoff, Christel Herold-Mende, Uwe Haberkorn, Annette Altmann
Alpha v beta 6 (αvβ6) integrin is overexpressed by several carcinomas, and thus considered as target for diagnostic imaging and anti-cancer therapies. Recently, we presented SFITGv6 as a novel potential tracer for imaging and targeted therapy of αvβ6 integin-positive carcinomas. Here, we analyzed affinity and specificity of five native αvβ6 integrin-specific binders in comparison to SFITGv6. Methods: Sunflower trypsin inhibitor (SFTI)-1-based peptides containing arginine-glycine-aspartic acid (RGD) motif-spanning octamers of fibronectin (SFFN1), tenascin C (SFTNC), vitronectin (SFVTN), and latency-associated peptides (LAP) 1 (SFLAP1), and 3 (SFLAP3) were synthesized and their binding potential to αvβ6 integrin-expressing head and neck squamous cell carcinoma (HNSCC) cell lines was evaluated...
April 19, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Tian-Le Shen, Mi-Na Liu, Qin Zhang, Wen Feng, Wen Yu, Xiao-Long Fu, Xu-Wei Cai
BACKGROUND: Radiation-induced lung toxicity (RILT) is a severe complication of radiotherapy in patients with thoracic tumors. Through proteomics, we have previously identified vitronectin (VTN) as a potential biomarker for patients with lung toxicity of grade ≥ 2 radiation. Herein, we explored the molecular mechanism of VTN in the process of RILT. METHODS: In this study, lentivirus encoding for VTN and VTN-specific siRNA were constructed and transfected into the cultured fibroblasts and C57BL mice...
April 16, 2018: Journal of Translational Medicine
Mengzhu Cheng, Lihong Wang, Qing Yang, Xiaohua Huang
The pollution of rare earth elements (REEs) in ecosystem is becoming more and more serious, so it is urgent to establish methods for monitoring the pollution of REEs. Monitoring environmental pollution via the response of plants to pollutants has become the most stable and accurate method compared with traditional methods, but scientists still need to find the primary response of plants to pollutants to improve the sensitivity and speed of this method. Based on the facts that the initiation of endocytosis is the primary cellular response of the plant leaf cells to REEs and the detection of endocytosis is complex and expensive, we constructed a detection method in living plant cells for rapidly monitoring the response of plants to exogenous lanthanum [La(III), a representative of REEs] by designing a new immuno-electrochemical method for detecting the content change in extracellular vitronectin-like protein (VN) that are closely related to endocytosis...
August 30, 2018: Ecotoxicology and Environmental Safety
Julius Müller, Johanna Simon, Philipp Rohne, Claudia Koch-Brandt, Volker Mailänder, Svenja Morsbach, Katharina Landfester
The use of nanocarriers as drug delivery vehicles brings them into contact with blood plasma proteins. Polymeric nanocarriers require some sort of surfactant to ensure colloidal stability. Formation of the protein corona is therefore determined not only by the intrinsic properties of the nanocarrier itself but also by the accompanying surfactant. Although it is well-known that surfactants have an impact on protein structure, only few studies were conducted on the specific effect of surfactants on the composition of protein corona of nanocarriers...
April 20, 2018: Biomacromolecules
Caroline A B Hey, Katarina B Saltõkova, Hanne C Bisgaard, Lisbeth B Møller
Different culture-systems for derivation of induced pluripotent stem cells (iPSC) in vitro from human fibroblasts have been established. Here, we compared the efficacy of two different feeder-free culture-systems; Matrigel-coated surfaces in combination with mTeSR1 medium versus Vitronectin-coated surfaces in combination with Essential 8 (E8) medium. The comparison was performed by counting the number of emerging iPSC-looking colonies of re-programmed fibroblasts. The fibroblasts were re-programmed using episomal plasmids expressing OCT3/4, SOX2, KLF4, L-MYC, LIN28, and a p53 knock down shP53...
March 30, 2018: Cell Biology International
Andrew Smith, Manuel Galli, Isabella Piga, Vanna Denti, Martina Stella, Clizia Chinello, Nicola Fusco, Davide Leni, Marco Manzoni, Gaia Roversi, Mattia Garancini, Angela Ida Pincelli, Vincenzo Cimino, Giulia Capitoli, Fulvio Magni, Fabio Pagni
The main aim of the study was to assess the feasibility of matrix-assisted laser desorption/ionisation mass spectrometry imaging (MALDI-MSI) in the pathological investigation of Medullary Thyroid Carcinoma (MTC). Formalin-fixed paraffin-embedded (FFPE) samples from seven MTC patients were analysed by MALDI-MSI in order to detect proteomic alterations within tumour lesions and to define the molecular profiles of specific findings, such as amyloid deposition and C cell hyperplasia (CCH). nLC-ESI MS/MS was employed for the identification of amyloid components and to select alternative proteomic markers of MTC pathogenesis...
March 24, 2018: Journal of Proteomics
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