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Fibroblast topology

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https://www.readbyqxmd.com/read/28884679/the-integration-of-a-macrophage-adapted-live-vaccine-strain-of-equine-infectious-anaemia-virus-eiav-in-the-horse-genome
#1
Qiang Liu, Xue-Feng Wang, Cheng Du, Yue-Zhi Lin, Jian Ma, Yu-Hong Wang, Jian-Hua Zhou, Xiaojun Wang
Integration is an important feature of retroviruses and retrovirus-based therapeutic transfection vectors. The non-primate lentivirus equine infectious anaemia virus (EIAV) primarily targets macrophages/monocytes in vivo. Investigation of the integration features of EIAVDLV121 strains, which are adapted to donkey monocyte-derived macrophages (MDMs), is of great interest. In this study, we analysed the integration features of EIAVDLV121 in equine MDMs during in vitro infection. Our previously published integration sites (IS) for EIAVFDDV13 in fetal equine dermal (FED) cells were also analysed in parallel as references...
September 7, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28792773/easy-to-apply-polyoxazoline-based-coating-for-precise-and-long-term-control-of-neural-patterns
#2
Serge Weydert, Stefan Zürcher, Stefanie Tanner, Ning Zhang, Rebecca Ritter, Thomas Peter, Mathias J Aebersold, Greta Thompson-Steckel, Csaba Forró, Markus Rottmar, Flurin Stauffer, Irene A Valassina, Giulia Morgese, Edmondo M Benetti, Samuele Tosatti, János Vörös
Arranging cultured cells in patterns via surface modification is a tool used by biologists to answer questions in a specific and controlled manner. In the past decade, bottom-up neuroscience emerged as a new application, which aims to get a better understanding of the brain via reverse engineering and analyzing elementary circuitry in vitro. Building well-defined neural networks is the ultimate goal. Antifouling coatings are often used to control neurite outgrowth. Because erroneous connectivity alters the entire topology and functionality of minicircuits, the requirements are demanding...
August 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28644625/chemically-modified-surface-having-a-dual-structured-hierarchical-topography-for-controlled-cell-growth
#3
Lun Peng, Shenglin Zhou, Bo Yang, Meimei Bao, Gaojian Chen, Xiaohua Zhang
This report describes a technique for fabricating dual-structured hierarchical surface topography on the surface of polydimethylsiloxane (PDMS) films through simply replicating prefabricated patterns and wrinkling PDMS films. To enhance the biocompatibility of PDMS films, we synthesize a biocompatible dopamine-glycopolymer, which is utilized to modify the chemical feature of the PDMS surface. Dopamine component in this copolymer is introduced for the formation of a carbohydrate layer on the surface of PDMS films because of its excellent adhesion...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28424523/cohesin-is-positioned-in-mammalian-genomes-by-transcription-ctcf-and-wapl
#4
Georg A Busslinger, Roman R Stocsits, Petra van der Lelij, Elin Axelsson, Antonio Tedeschi, Niels Galjart, Jan-Michael Peters
Mammalian genomes are spatially organized by CCCTC-binding factor (CTCF) and cohesin into chromatin loops and topologically associated domains, which have important roles in gene regulation and recombination. By binding to specific sequences, CTCF defines contact points for cohesin-mediated long-range chromosomal cis-interactions. Cohesin is also present at these sites, but has been proposed to be loaded onto DNA elsewhere and to extrude chromatin loops until it encounters CTCF bound to DNA. How cohesin is recruited to CTCF sites, according to this or other models, is unknown...
April 27, 2017: Nature
https://www.readbyqxmd.com/read/28371268/aging-of-the-skeletal-muscle-extracellular-matrix-drives-a-stem-cell-fibrogenic-conversion
#5
Kristen M Stearns-Reider, Antonio D'Amore, Kevin Beezhold, Benjamin Rothrauff, Loredana Cavalli, William R Wagner, David A Vorp, Alkiviadis Tsamis, Sunita Shinde, Changqing Zhang, Aaron Barchowsky, Thomas A Rando, Rocky S Tuan, Fabrisia Ambrosio
Age-related declines in skeletal muscle regeneration have been attributed to muscle stem cell (MuSC) dysfunction. Aged MuSCs display a fibrogenic conversion, leading to fibrosis and impaired recovery after injury. Although studies have demonstrated the influence of in vitro substrate characteristics on stem cell fate, whether and how aging of the extracellular matrix (ECM) affects stem cell behavior has not been investigated. Here, we investigated the direct effect of the aged muscle ECM on MuSC lineage specification...
June 2017: Aging Cell
https://www.readbyqxmd.com/read/28349474/graph-theory-based-analysis-of-the-lymph-node-fibroblastic-reticular-cell-network
#6
Mario Novkovic, Lucas Onder, Gennady Bocharov, Burkhard Ludewig
Secondary lymphoid organs have developed segregated niches that are able to initiate and maintain effective immune responses. Such global organization requires tight control of diverse cellular components, specifically those that regulate lymphocyte trafficking. Fibroblastic reticular cells (FRCs) form a densely interconnected network in lymph nodes and provide key factors necessary for T cell migration and retention, and foster subsequent interactions between T cells and dendritic cells. Development of integrative systems biology approaches has made it possible to elucidate this multilevel complexity of the immune system...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28340537/study-on-a-3d-hydrogel-based-culture-model-for-characterizing-growth-of-fibroblasts-under-viral-infection-and-drug-treatment
#7
Xiaolu Zhu, Xianting Ding
Three-dimensional (3D) in vitro tissue models provide an approach for the systematic, repetitive, and quantitative study of drugs. In this study, we constructed an in vitro 3D acrylated hyaluronic acid (AHA) hydrogel model encapsulating fibroblasts, performed long-period 3D culture, and tested cellular topological changes and proliferation variation in the presence of herpes simplex virus-1 (HSV-1) as an infecting virus and acyclovir (ACV) as the treatment drug. The AHA hydrogels were formed by using Michael addition chemistry of bis-cysteine containing MMP-degradable cross-linker onto AHA prefunctionalized with cell adhesion peptides (RGD)...
June 2017: SLAS Discovery
https://www.readbyqxmd.com/read/28331312/investigation-of-silk-fibroin-nanoparticle-decorated-poly-l-lactic-acid-composite-scaffolds-for-osteoblast-growth-and-differentiation
#8
Biao-Qi Chen, Ranjith Kumar Kankala, Ai-Zheng Chen, Ding-Zhu Yang, Xiao-Xia Cheng, Ni-Na Jiang, Kai Zhu, Shi-Bin Wang
Attempts to reflect the physiology of organs is quite an intricacy during the tissue engineering process. An ideal scaffold and its surface topography can address and manipulate the cell behavior during the regeneration of targeted tissue, affecting the cell growth and differentiation significantly. Herein, silk fibroin (SF) nanoparticles were incorporated into poly(l-lactic acid) (PLLA) to prepare composite scaffolds via phase-inversion technique using supercritical carbon dioxide (SC-CO2). The SF nanoparticle core increased the surface roughness and hydrophilicity of the PLLA scaffolds, leading to a high affinity for albumin attachment...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28068057/topological-control-of-extracellular-matrix-growth-a-native-like-model-for-cell-morphodynamics-studies
#9
David Caballero, Josep Samitier
The interaction of cells with their natural environment influences a large variety of cellular phenomena, including cell adhesion, proliferation, and migration. The complex extracellular matrix network has challenged the attempts to replicate in vitro the heterogeneity of the cell environment and has threatened, in general, the relevance of in vitro studies. In this work, we describe a new and extremely versatile approach to generate native-like extracellular matrices with controlled morphologies for the in vitro study of cellular processes...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27995750/keloid-progression-a-stiffness-gap-hypothesis
#10
Chenyu Huang, Longwei Liu, Zhifeng You, Bingjie Wang, Yanan Du, Rei Ogawa
Keloids are fibroproliferative skin disorders characterised clinically by continuous horizontal progression and post-surgical recurrence and histologically by the accumulation of collagen and fibroblast ingredients. Till now, their aetiology remains clear, which may cover genetic, environmental and metabolic factors. Evidence in the involvement of local mechanics (e.g. predilection site and typical shape) and the progress in mechanobiology have incubated our stiffness gap hypotheses in illustrating the chronic but constant development in keloid...
December 19, 2016: International Wound Journal
https://www.readbyqxmd.com/read/27917883/comparison-of-cell-behavior-on-pva-pva-gelatin-electrospun-nanofibers-with-random-and-aligned-configuration
#11
Chen-Yu Huang, Keng-Hsiang Hu, Zung-Hang Wei
Electrospinning technique is able to create nanofibers with specific orientation. Poly(vinyl alcohol) (PVA) have good mechanical stability but poor cell adhesion property due to the low affinity of protein. In this paper, extracellular matrix, gelatin is incorporated into PVA solution to form electrospun PVA-gelatin nanofibers membrane. Both randomly oriented and aligned nanofibers are used to investigate the topography-induced behavior of fibroblasts. Surface morphology of the fibers is studied by optical microscopy and scanning electron microscopy (SEM) coupled with image analysis...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27579918/meta-analysis-of-transcriptome-regulation-during-induction-to-cardiac-myocyte-fate-from-mouse-and-human-fibroblasts
#12
Shima Rastegar-Pouyani, Niusha Khazaei, Ping Wee, Moein Yaqubi, Abdulshakour Mohammadnia
Ectopic expression of a defined set of transcription factors (TFs) can directly convert fibroblasts into a cardiac myocyte cell fate. Beside inefficiency in generating induced cardiomyocytes (iCMs), the molecular mechanisms that regulate this process remained to be well defined. The main purpose of this study was to provide better insight on the transcriptome regulation and to introduce a new strategy for candidating TFs for the transdifferentiation process. Eight mouse and three human high quality microarray data sets were analyzed to find differentially expressed genes (DEGs), which we integrated with TF-binding sites and protein-protein interactions to construct gene regulatory and protein-protein interaction networks...
August 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27494044/-race-for-the-surface-eukaryotic-cells-can-win
#13
Vy T H Pham, Vi Khanh Truong, Anna Orlowska, Shahram Ghanaati, Mike Barbeck, Patrick Booms, Alex J Fulcher, Chris M Bhadra, Ričardas Buividas, Vladimir Baulin, C James Kirkpatrick, Pauline Doran, David E Mainwaring, Saulius Juodkazis, Russell J Crawford, Elena P Ivanova
With an aging population and the consequent increasing use of medical implants, managing the possible infections arising from implant surgery remains a global challenge. Here, we demonstrate for the first time that a precise nanotopology provides an effective intervention in bacterial cocolonization enabling the proliferation of eukaryotic cells on a substratum surface, preinfected by both live Gram-negative, Pseudomonas aeruginosa, and Gram-positive, Staphylococcus aureus, pathogenic bacteria. The topology of the model black silicon (bSi) substratum not only favors the proliferation of eukaryotic cells but is biocompatible, not triggering an inflammatory response in the host...
August 31, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27485292/calcium-induced-conformational-changes-of-thrombospondin-1-signature-domain-implications-for-vascular-disease
#14
Akanksha Gupta, Rahul Agarwal, Ashutosh Singh, Sonika Bhatnagar
CONTEXT: Thrombospondin1 (TSP1) participates in numerous signaling pathways critical for vascular physiology and disease. The conserved signature domain of thrombospondin 1 (TSP1-Sig1) comprises three epidermal growth factor (EGF), 13 calcium-binding type 3 thrombospondin (T3) repeats, and one lectin-like module arranged in a stalk-wire-globe topology. TSP1 is known to be present in both calcium-replete (Holo-) and calcium-depleted (Apo-) state, each with distinct downstream signaling effects...
June 2017: Journal of Receptor and Signal Transduction Research
https://www.readbyqxmd.com/read/27415420/topological-small-world-organization-of-the-fibroblastic-reticular-cell-network-determines-lymph-node-functionality
#15
Mario Novkovic, Lucas Onder, Jovana Cupovic, Jun Abe, David Bomze, Viviana Cremasco, Elke Scandella, Jens V Stein, Gennady Bocharov, Shannon J Turley, Burkhard Ludewig
Fibroblastic reticular cells (FRCs) form the cellular scaffold of lymph nodes (LNs) and establish distinct microenvironmental niches to provide key molecules that drive innate and adaptive immune responses and control immune regulatory processes. Here, we have used a graph theory-based systems biology approach to determine topological properties and robustness of the LN FRC network in mice. We found that the FRC network exhibits an imprinted small-world topology that is fully regenerated within 4 wk after complete FRC ablation...
July 2016: PLoS Biology
https://www.readbyqxmd.com/read/27261203/molecular-basis-of-retinol-anti-ageing-properties-in-naturally-aged-human-skin-in-vivo
#16
Y Shao, T He, G J Fisher, J J Voorhees, T Quan
OBJECTIVE: Retinoic acid has been shown to improve the aged-appearing skin. However, less is known about the anti-ageing effects of retinol (ROL, vitamin A), a precursor of retinoic acid, in aged human skin in vivo. This study aimed to investigate the molecular basis of ROL anti-ageing properties in naturally aged human skin in vivo. METHODS: Sun-protected buttock skin (76 ± 6 years old, n = 12) was topically treated with 0.4% ROL and its vehicle for 7 days. The effects of topical ROL on skin epidermis and dermis were evaluated by immunohistochemistry, in situ hybridization, Northern analysis, real-time RT-PCR and Western analysis...
February 2017: International Journal of Cosmetic Science
https://www.readbyqxmd.com/read/27196306/nanofiber-alignment-regulates-nih3t3-cell-orientation-and-cytoskeletal-gene-expression-on-electrospun-pcl-gelatin-nanofibers
#17
Timothy Fee, Swetha Surianarayanan, Crawford Downs, Yong Zhou, Joel Berry
To examine the influence of substrate topology on the behavior of fibroblasts, tissue engineering scaffolds were electrospun from polycaprolactone (PCL) and a blend of PCL and gelatin (PCL+Gel) to produce matrices with both random and aligned nanofibrous orientations. The addition of gelatin to the scaffold was shown to increase the hydrophilicity of the PCL matrix and to increase the proliferation of NIH3T3 cells compared to scaffolds of PCL alone. The orientation of nanofibers within the matrix did not have an effect on the proliferation of adherent cells, but cells on aligned substrates were shown to elongate and align parallel to the direction of substrate fiber alignment...
2016: PloS One
https://www.readbyqxmd.com/read/27060148/de-novo-deciphering-three-dimensional-chromatin-interaction-and-topological-domains-by-wavelet-transformation-of-epigenetic-profiles
#18
Yong Chen, Yunfei Wang, Zhenyu Xuan, Min Chen, Michael Q Zhang
Defining chromatin interaction frequencies and topological domains is a great challenge for the annotations of genome structures. Although the chromosome conformation capture (3C) and its derivative methods have been developed for exploring the global interactome, they are limited by high experimental complexity and costs. Here we describe a novel computational method, called CITD, for de novo prediction of the chromatin interaction map by integrating histone modification data. We used the public epigenomic data from human fibroblast IMR90 cell and embryonic stem cell (H1) to develop and test CITD, which can not only successfully reconstruct the chromatin interaction frequencies discovered by the Hi-C technology, but also provide additional novel details of chromosomal organizations...
June 20, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/26895106/pathway-of-ppar-gamma-coactivators-in-thermogenesis-a-pivotal-traditional-chinese-medicine-associated-target-for-individualized-treatment-of-rheumatoid-arthritis
#19
Yanqiong Zhang, Xia Mao, Qiuyan Guo, Ming Bai, Bo Zhang, Chunfang Liu, Yanqun Sun, Shao Li, Na Lin
Traditional Chinese medicine (TCM) syndromes have been regarded as the crucial clinical manifestations for individualized diagnosis and treatment of complex diseases, including rheumatoid arthritis (RA) and cancer. Especially, RA patients are classified into cold and hot syndromes with different clinical manifestations, interventions and molecular mechanisms. Better effectiveness of a classic cold syndrome-specific herbal formula Wu-tou decoction (WTD) has been achieved. To explore molecular mechanisms of syndrome-specific formulae is of great clinical significance to improve the effectiveness and pertinence of treatment for the complex diseases with personalized conditions...
March 29, 2016: Oncotarget
https://www.readbyqxmd.com/read/26872345/cell-resistant-zwitterionic-polyelectrolyte-coating-promotes-bacterial-attachment-an-adhesion-contradiction
#20
Jessica S Martinez, Kristopher D Kelly, Yara E Ghoussoub, Jose D Delgado, Thomas C S Keller Iii, Joseph B Schlenoff
Polymers of various architectures with zwitterionic functionality have recently been shown to effectively suppress nonspecific fouling of surfaces by proteins and prokaryotic (bacteria) or eukaryotic (mammalian) cells as well as other microorganisms and environmental contaminants. In this work, zwitterionic copolymers were used to make thin coatings on substrates with the layer-by-layer method. Polyelectrolyte multilayers, PEMUs, were built with [poly(allylamine hydrochloride)], PAH, and copolymers of acrylic acid and either the AEDAPS zwitterionic group 3-[2-(acrylamido)-ethyldimethyl ammonio] propane sulfonate (PAA-co-AEDAPS), or benzophenone (PAABp)...
April 2016: Biomaterials Science
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