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Fibronectin assembly

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https://www.readbyqxmd.com/read/27925458/an-engineered-breast-cancer-model-on-a-chip-to-replicate-ecm-activation-in-vitro-during-tumor-progression
#1
Filomena Gioiella, Francesco Urciuolo, Giorgia Imparato, Virginia Brancato, Paolo A Netti
In this work, a new model of breast cancer is proposed featuring both epithelial and stromal tissues arranged on a microfluidic chip. The main task of the work is the in vitro replication of the stromal activation during tumor epithelial invasion. The activation of tumor stroma and its morphological/compositional changes play a key role in tumor progression. Despite emerging evidences, to date the activation of tumor stroma in vitro has not been achieved yet. The tumor-on-chip proposed in this work is built in order to replicate the features of its native counterpart: multicellularity (tumor epithelial cell and stromal cell); 3D engineered stroma compartment composed of cell-assembled extracellular matrix (ECM); reliable 3D tumor architecture...
December 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27920201/the-streptococcus-gordonii-adhesin-csha-binds-host-fibronectin-via-a-catch-clamp-mechanism
#2
Catherine R Back, Maryta N Sztukowska, Marisa Till, Richard J Lamont, Howard F Jenkinson, Angela H Nobbs, Paul R Race
Adherence of bacteria to biotic or abiotic surfaces is a prerequisite for host colonization and represents an important step in microbial pathogenicity. This attachment is facilitated by bacterial adhesins at the cell surface. Due to their size and often elaborate multi-domain architectures, these polypeptides represent challenging targets for detailed structural and functional characterization. The multifunctional fibrillar adhesin CshA, which mediates binding to both host molecules and other microorganisms, is an important determinant of colonisation by Streptococcus gordonii, an oral commensal and opportunistic pathogen of animals and humans...
December 5, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27914270/surface-mediated-transfection-of-a-pdna-vector-encoding-short-hairpin-rna-to-downregulate-tgf-%C3%AE-1-expression-for-the-prevention-of-in-stent-restenosis
#3
He Zhang, Ke-Feng Ren, Hao Chang, Jin-Lei Wang, Jian Ji
In-stent restenosis is one of the most serious modes of failure of cardiovascular stent implant. Although drug-eluting stents have been proven to reduce in-stent restenosis, the nonspecific inhibitory effects of anti-proliferative drugs, such as rapamycin, result in delayed re-endothelialization and fatal late stent thrombosis. Although many studies have focused on promoting rapid re-endothelialization, a feasible method of reducing excessive extracellular matrix (ECM) production and cell proliferation might provide a promising way to efficiently inhibit the restenosis in vivo...
November 24, 2016: Biomaterials
https://www.readbyqxmd.com/read/27909707/in-vitro-study-of-the-host-responses-to-model-biomaterials-via-a-fibroblast-macrophage-co-culture-system
#4
Guoying Zhou, Andrea Liedmann, Chandralekha Chatterjee, Thomas Groth
Surface properties are believed to play important roles in initial inflammatory and subsequent wound healing/fibrotic responses after implantation of biomaterials. To investigate the surface property effect in mediating these host responses, we used an in vitro fibroblast/macrophage co-culture model established with a cell migration chamber, and a series of self-assembling monolayers (SAMs) bearing different terminal groups as model surfaces to study the effect of surface properties on macrophage fusion, fibroblast attachment, spreading morphology, proliferation, outgrowth, as well as pro-(interleukin-6) and anti-(interleukin-10) inflammatory cytokine production, expression of ED-A fibronectin (FN) and alpha-smooth muscle actin (α-SMA)...
December 2, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27893712/blood-vessel-endothelium-directed-tumor-cell-streaming-in-breast-tumors-requires-the-hgf-c-met-signaling-pathway
#5
E Leung, A Xue, Y Wang, P Rougerie, V P Sharma, R Eddy, D Cox, J Condeelis
During metastasis to distant sites, tumor cells migrate to blood vessels. In vivo, breast tumor cells utilize a specialized mode of migration known as streaming, where a linear assembly of tumor cells migrate directionally towards blood vessels on fibronectin-collagen I-containing extracellular matrix (ECM) fibers in response to chemotactic signals. We have successfully reconstructed tumor cell streaming in vitro by co-plating tumors cells, macrophages and endothelial cells on 2.5 μm thick ECM-coated micro-patterned substrates...
November 28, 2016: Oncogene
https://www.readbyqxmd.com/read/27863391/nordihydroguaiaretic-acid-impairs-prostate-cancer-cell-migration-and-tumor-metastasis-by-suppressing-neuropilin-1
#6
Xin Li, Shengjun Fan, Xueyang Pan, Yilixiati Xiaokaiti, Jianhui Duan, Yundi Shi, Yan Pan, Lu Tie, Xin Wang, Yuhua Li, Xuejun Li
Tumor metastasis is a major cause leading to the deaths of cancer patients. Nordihydroguaiaretic acid (NDGA) is a natural product that has been demonstrated to show therapeutic values in multiple diseases. In this study, we report that NDGA can inhibit cell migration and tumor metastasis via a novel mechanism. NDGA suppresses NRP1 function by downregulating its expression, which leads to attenuated cell motility, cell adhesion to ECM and FAK signaling in cancer cells. Moreover, due to its cross-cell type activity on NRP1 suppression, NDGA also impairs angiogenesis function of endothelial cells and fibronectin assembly by fibroblasts, both of which are critical to promote metastasis...
November 15, 2016: Oncotarget
https://www.readbyqxmd.com/read/27859262/functional-and-prognostic-significance-of-the-genomic-amplification-of-frizzled-receptor-6-fzd6-in-breast-cancer
#7
Gabriele Corda, Gianluca Sala, Rossano Lattanzio, Manuela Iezzi, Michele Sallese, Giorgia Fragassi, Alessia Lamolinara, Hasan Mirza, Daniela Barcaroli, Sibylle Ermler, Elisabete Silva, Hemad Yasaei, Robert F Newbold, Paola Vagnarelli, Marcella Mottolese, Pier Giorgio Natali, Letizia Perracchio, Jelmar Quist, Anita Grigoriadis, Pierfrancesco Marra, Andrew N Tutt, Mauro Piantelli, Stefano Iacobelli, Vincenzo De Laurenzi, Arturo Sala
Frizzled receptors mediate Wnt ligands' signalling, which is crucially involved in regulating tissue development, differentiation and is often deregulated in cancer. In this study we found that the Wnt receptor frizzled 6 (FZD6) is frequently amplified in breast cancer, with an increased incidence in the triple negative breast cancer (TNBC) subtype. Ablation of FZD6 gene expression in mammary cancer cell lines: a) inhibited motility and invasion b) induced a more symmetric shape of organoid 3D cultures c) inhibited bone and liver metastasis in vivo...
November 9, 2016: Journal of Pathology
https://www.readbyqxmd.com/read/27808176/sulfated-hyaluronan-alters-fibronectin-matrix-assembly-and-promotes-osteogenic-differentiation-of-human-bone-marrow-stromal-cells
#8
Sarah Vogel, Simon Arnoldini, Stephanie Möller, Matthias Schnabelrauch, Ute Hempel
Extracellular matrix (ECM) composition and structural integrity is one of many factors that influence cellular differentiation. Fibronectin (FN) which is in many tissues the most abundant ECM protein forms a unique fibrillary network. FN homes several binding sites for sulfated glycosaminoglycans (sGAG), such as heparin (Hep), which was previously shown to influence FN conformation and protein binding. Synthetically sulfated hyaluronan derivatives (sHA) can serve as model molecules with a well characterized sulfation pattern to study sGAG-FN interaction...
November 3, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27804918/self-assembled-nanoparticles-comprising-aptide-sn38-conjugates-for-use-in-targeted-cancer-therapy
#9
Hyungjun Kim, Yonghyun Lee, Sukmo Kang, Minsuk Choi, Soyoung Lee, Sunghyun Kim, Vipul Gujrati, Jinjoo Kim, Sangyong Jon
Self-assembled nanoparticles (NPs) have been intensively utilized as cancer drug delivery carriers because hydrophobic anticancer drugs may be efficiently loaded into the particle cores. In this study, we synthesized and evaluated the therapeutic index of self-assembled NPs chemically conjugated to a fibronectin extra domain B-specific peptide (APTEDB) and an anticancer agent SN38. The APTEDB-SN38 formed self-assembled structures with a diameter of 58 ± 3 nm in an aqueous solution and displayed excellent drug loading, solubility, and stability properties...
November 2, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27798121/minireview-fibronectin-in-retinal-disease
#10
Charles G Miller, Greg Budoff, Jonathan L Prenner, Jean E Schwarzbauer
Retinal fibrosis, characterized by dysregulation of extracellular matrix (ECM) protein deposition by retinal endothelial cells, pigment epithelial cells, and other resident cell-types, is a unifying feature of several common retinal diseases. Fibronectin is an early constituent of newly deposited ECM and serves as a template for assembly of other ECM proteins, including collagens. Under physiologic conditions, fibronectin is found in all layers of Bruch's membrane. Proliferative vitreoretinopathy (PVR), a complication of retinal surgery, is characterized by ECM accumulation...
January 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27787529/self-assembly-of-vascularized-tissue-to-support-tumor-explants-in-vitro
#11
Despina Bazou, Nir Maimon, Gabriel Gruionu, Lance L Munn
Testing the efficacy of cancer drugs requires functional assays that recapitulate the cell populations, anatomy and biological responses of human tumors. Although current animal models and in vitro cell culture platforms are informative, they have significant shortcomings. Mouse models can reproduce tissue-level and systemic responses to tumor growth and treatments observed in humans, but xenografts from patients often do not grow, or require months to develop. On the other hand, current in vitro assays are useful for studying the molecular bases of tumorigenesis or drug activity, but often lack the appropriate in vivo cell heterogeneity and natural microenvironment...
December 5, 2016: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/27783674/kinetic-controlled-tag-catcher-interactions-for-directed-covalent-protein-assembly
#12
Lee Ling Tan, Shawn S Hoon, Fong T Wong
Over the last few years, a number of different protein assembly strategies have been developed, greatly expanding the toolbox for controlling macromolecular assembly. One of the most promising developments is a rapid protein ligation approach using a short polypeptide SpyTag and its partner, SpyCatcher derived from Streptococcus pyogenes fibronectin-binding protein, FbaB. To extend this technology, we have engineered and characterized a new Tag-Catcher pair from a related fibronectin-binding protein in Streptococcus dysgalactiae...
2016: PloS One
https://www.readbyqxmd.com/read/27775029/protein-kinase-d1-regulates-focal-adhesion-dynamics-and-cell-adhesion-through-phosphatidylinositol-4-phosphate-5-kinase-type-l-%C3%AE
#13
Nisha Durand, Ligia I Bastea, Jason Long, Heike Döppler, Kun Ling, Peter Storz
Focal adhesions (FAs) are highly dynamic structures that are assembled and disassembled on a continuous basis. The balance between the two processes mediates various aspects of cell behavior, ranging from cell adhesion and spreading to directed cell migration. The turnover of FAs is regulated at multiple levels and involves a variety of signaling molecules and adaptor proteins. In the present study, we show that in response to integrin engagement, a subcellular pool of Protein Kinase D1 (PKD1) localizes to the FAs...
October 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27770914/corrosion-resistance-and-biocompatibility-of-magnesium-alloy-modified-by-alkali-heating-treatment-followed-by-the-immobilization-of-poly-ethylene-glycol-fibronectin-and-heparin
#14
Changjiang Pan, Youdong Hu, Yu Hou, Tao Liu, Yuebin Lin, Wei Ye, Yanhua Hou, Tao Gong
In recent years, magnesium alloys are attracting more and more attention as a kind of biodegradable metallic biomaterials, however, their uncontrollable biodegradation speed in vivo and the limited surface biocompatibility hinder their clinical applications. In the present study, with the aim of improving the corrosion resistance and biocompatibility, the magnesium alloy (AZ31B) surface was modified by alkali heating treatment followed by the self-assembly of 3-aminopropyltrimethoxysilane (APTMS). Subsequently, poly (ethylene glycol) (PEG) and fibronectin or fibronectin/heparin complex were sequentially immobilized on the modified surface...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27759118/factor-xiii-a-transglutaminase-deficient-mice-show-signs-of-metabolically-healthy-obesity-on-high-fat-diet
#15
Vamsee D Myneni, Aisha Mousa, Mari T Kaartinen
F13A1 gene, which encodes for Factor XIII-A blood clotting factor and a transglutaminase enzyme, was recently identified as a potential causative gene for obesity in humans. In our previous in vitro work, we showed that FXIII-A regulates preadipocyte differentiation and modulates insulin signaling via promoting plasma fibronectin assembly into the extracellular matrix. To understand the role of FXIII-A in whole body energy metabolism, here we have characterized the metabolic phenotype of F13a1-/- mice. F13a1-/- and F13a1+/+ type mice were fed chow or obesogenic, high fat diet for 20 weeks...
October 19, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27741558/the-group-a-streptococcus-serotype-m2-pilus-plays-a-role-in-host-cell-adhesion-and-immune-evasion
#16
Jia-Yun C Tsai, Jacelyn M S Loh, Fiona Clow, Natalie Lorenz, Thomas Proft
Group A Streptococcus (GAS), or Streptococcus pyogenes, is a human pathogen that causes diseases ranging from skin and soft tissue infections to severe invasive diseases, such as toxic shock syndrome. Each GAS strain carries a particular pilus type encoded in the variable fibronectin-binding, collagen-binding, T antigen (FCT) genomic region. Here, we describe the functional analysis of the serotype M2 pilus encoded in the FCT-6 region. We found that, in contrast to other investigated GAS pili, the ancillary pilin 1 lacks adhesive properties...
October 14, 2016: Molecular Microbiology
https://www.readbyqxmd.com/read/27721010/3d-is-not-enough-building-up-a-cell-instructive-microenvironment-for-tumoral-stroma-microtissues
#17
Virginia Brancato, Alessandro Garziano, Filomena Gioiella, Francesco Urciuolo, Giorgia Imparato, Valeria Panzetta, Sabato Fusco, Paolo A Netti
: We fabricated three-dimensional microtissues with the aim to replicate in vitro the composition and the functionalities of the tumor microenvironment. By arranging either normal fibroblasts (NF) or cancer-activated fibroblasts (CAF) in two different three dimensional (3D) configurations, two kinds of micromodules were produced: spheroids and microtissues. Spheroids were obtained by means of the traditional cell aggregation technique resulting in a 3D model characterized by high cell density and low amount of extracellular proteins...
October 6, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27714997/surfaces-mimicking-glycosaminoglycans-trigger-different-response-of-stem-cells-via-distinct-fibronectin-adsorption-and-reorganization
#18
Ana R Araújo, Diana P Soares da Costa, Sara Amorim, Rui L Reis, Ricardo A Pires, Iva Pashkuleva
We report on the utility of a platform created by self-assembled monolayers to investigate the influence of the degree of sulfation of glycosaminoglycans (GAGs) on their interactions with fibronectin (Fn) and the impact of these interactions on the adhesion and morphology of human adipose derived stem cells (ASCs). We used the label-free QCM-D, AFM and SPR to follow the changes in the adlayer in close proximity to the substrates surface and QCM-D in combination with live imaging to characterize the adherent cells...
October 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27713971/template-assisted-extrusion-of-biopolymer-nanofibers-under-physiological-conditions
#19
Mohammad Raoufi, Neda Aslankoohi, Christine Mollenhauer, Heike Boehm, Joachim P Spatz, Dorothea Brüggemann
Biomedical applications ranging from tissue engineering to drug delivery systems require versatile biomaterials based on the scalable and tunable production of biopolymer nanofibers under physiological conditions. These requirements can be successfully met by a novel extrusion process through nanoporous aluminum oxide templates, which is presented in this study. With this simple method we are able to control the nanofiber diameter by chosing the size of the nanopores and the concentration of the biopolymer feed solution...
October 10, 2016: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/27713865/characterization-of-the-adherence-of-clostridium-difficile-spores-the-integrity-of-the-outermost-layer-affects-adherence-properties-of-spores-of-the-epidemic-strain-r20291-to-components-of-the-intestinal-mucosa
#20
Paola Mora-Uribe, Camila Miranda-Cárdenas, Pablo Castro-Córdova, Fernando Gil, Iván Calderón, Juan A Fuentes, Paula I Rodas, Saeed Banawas, Mahfuzur R Sarker, Daniel Paredes-Sabja
Clostridium difficile is the causative agent of the most frequently reported nosocomial diarrhea worldwide. The high incidence of recurrent infection is the main clinical challenge of C. difficile infections (CDI). Formation of C. difficile spores of the epidemic strain R20291 has been shown to be essential for recurrent infection and transmission of the disease in a mouse model. However, the underlying mechanisms of how these spores persist in the colonic environment remains unclear. In this work, we characterized the adherence properties of epidemic R20291 spores to components of the intestinal mucosa, and we assessed the role of the exosporium integrity in the adherence properties by using cdeC mutant spores with a defective exosporium layer...
2016: Frontiers in Cellular and Infection Microbiology
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