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https://www.readbyqxmd.com/read/28302906/distinct-focal-adhesion-protein-modules-control-different-aspects-of-mechanotransduction
#1
Ben Stutchbury, Paul Atherton, Ricky Tsang, De-Yao Wang, Christoph Ballestrem
Focal adhesions (FAs) are macromolecular complexes that regulate cell adhesion and mechanotransduction. Using fluorescence recovery after photobleaching (FRAP) and fluorescence loss after photoactivation (FLAP), we found that the mobility of core FA proteins correlates with protein function. Structural proteins such as tensin, talin and vinculin are significantly less mobile in FAs than signaling proteins such as FAK and paxillin. The mobilities of the structural proteins are directly influenced by substrate stiffness, suggesting they are involved in sensing the rigidity of the extracellular environment...
March 16, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28301676/deprescribing-versus-continuation-of-chronic-proton-pump-inhibitor-use-in-adults
#2
REVIEW
Taline A Boghossian, Farah Joy Rashid, Wade Thompson, Vivian Welch, Paul Moayyedi, Carlos Rojas-Fernandez, Kevin Pottie, Barbara Farrell
BACKGROUND: Proton pump inhibitors (PPIs) are a class of medications that reduce acid secretion and are used for treating many conditions such as gastroesophageal reflux disease (GERD), dyspepsia, reflux esophagitis, peptic ulcer disease, and hypersecretory conditions (e.g. Zollinger-Ellison syndrome), and as part of the eradication therapy for Helicobacter pylori bacteria. However, approximately 25% to 70% of people are prescribed a PPI inappropriately. Chronic PPI use without reassessment contributes to polypharmacy and puts people at risk of experiencing drug interactions and adverse events (e...
March 16, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28299994/the-changes-of-cytoskeletal-proteins-induced-by-the-fast-effect-of-estrogen-in-mouse-blastocysts-and-its-roles-in-implantation
#3
Shi-Mao Zhang, Lin-Lin Yu, Ting Qu, Ying Hu, Dong-Zhi Yuan, Sheng Zhang, Qian Xu, You-Bo Zhao, Jin-Hu Zhang, Li-Min Yue
It is necessary for estrogen to activate mouse blastocysts, so that they can attach to endometrial epithelium in implantation and in our previous research, we have proved estrogen can induce a fast increase in intracellular calcium of mouse blastocysts through acting on G protein-coupled receptor 30 (GPR30), which further promotes their implantation. Moreover, there has been evidence that cytoskeletal proteins are involved in integrin-mediated adhesion of many kinds of cells, which also plays an important role in implantation...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28298549/diverging-white-matter-trajectories-in-children-after-traumatic-brain-injury-the-rapbi-study
#4
Emily L Dennis, Faisal Rashid, Monica U Ellis, Talin Babikian, Roza M Vlasova, Julio E Villalon-Reina, Yan Jin, Alexander Olsen, Richard Mink, Christopher Babbitt, Jeffrey Johnson, Christopher C Giza, Paul M Thompson, Robert F Asarnow
OBJECTIVE: To examine longitudinal trajectories of white matter organization in pediatric moderate/severe traumatic brain injury (msTBI) over a 12-month period. METHODS: We studied 21 children (16 M/5 F) with msTBI, assessed 2-5 months postinjury and again 13-19 months postinjury, as well as 20 well-matched healthy control children. We assessed corpus callosum function through interhemispheric transfer time (IHTT), measured using event-related potentials, and related this to diffusion-weighted MRI measures of white matter (WM) microstructure...
March 15, 2017: Neurology
https://www.readbyqxmd.com/read/28292367/myofibroblast-mediated-contraction
#5
Wae M Al Kattan, Seham F Alarfaj, Bayan M Alnooh, Hadeel F Alsaif, Hayfa S Alabdul Karim, Noha M Al-Qattan, Mohammad M Al-Qattan, Amel A F El-Sayed
Myofibroblast-mediated contraction is viewed as a cycle of four steps. The first step is stimulation of myofibroblasts by lysophospholipids leading to the activation of G proteins and ending with contraction of the actin-myosin complex. The next step is the transmission of the intracellular contractile force at the focal adhesions of myofibroblasts; a step that involves talin, vinculin, paxillin, Hic-5, and the integrin receptors. In the third step, fibronectin will act as the extracellular link between the integrin receptors and the extracellular collagen...
January 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28284333/serum-soluble-talin-1-levels-are-elevated-in-patients-with-multiple-sclerosis-reflecting-its-disease-activity
#6
Mayumi Muto, Masahiro Mori, Jia Liu, Akiyuki Uzawa, Tomohiko Uchida, Hiroki Masuda, Ryohei Ohtani, Kazuo Sugimoto, Satoshi Kuwabara
Previously, we identified anti-Talin-1 antibodies in the serum of MS. In this case, we measured the serum soluble Talin-1 (sTalin-1) levels by enzyme-linked immunosorbent assay. The serum sTalin-1 levels were significantly higher in 40 patients with MS than in 43 normal controls and in the acute phase of disease than in the remission phase. Interestingly, serum sTalin-1 levels were associated with a sustained increase in disability after MS attack but not with serum anti-Talin-1 antibody levels. sTalin-1 may be a biomarker for the acute phase of MS and may be used for the short-term prognosis of MS...
April 15, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/28263956/shank-proteins-limit-integrin-activation-by-directly-interacting-with-rap1-and%C3%A2-r-ras
#7
Johanna Lilja, Thomas Zacharchenko, Maria Georgiadou, Guillaume Jacquemet, Nicola De Franceschi, Emilia Peuhu, Hellyeh Hamidi, Jeroen Pouwels, Victoria Martens, Fatemeh Hassani Nia, Malte Beifuss, Tobias Boeckers, Hans-Juergen Kreienkamp, Igor L Barsukov, Johanna Ivaska
SHANK3, a synaptic scaffold protein and actin regulator, is widely expressed outside of the central nervous system with predominantly unknown function. Solving the structure of the SHANK3 N-terminal region revealed that the SPN domain is an unexpected Ras-association domain with high affinity for GTP-bound Ras and Rap G-proteins. The role of Rap1 in integrin activation is well established but the mechanisms to antagonize it remain largely unknown. Here, we show that SHANK1 and SHANK3 act as integrin activation inhibitors by sequestering active Rap1 and R-Ras via the SPN domain and thus limiting their bioavailability at the plasma membrane...
March 6, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28263592/quantitative-and-atomic-scale-view-of-co-induced-pt-nanoparticle-surface-reconstruction-at-saturation-coverage-via-dft-calculations-coupled-with-in-situ-tem-and-ir
#8
Talin Avanesian, Sheng Dai, Matthew J Kale, George W Graham, Xiaoqing Pan, Phillip Christopher
Atomic-scale insights into how supported metal nanoparticles catalyze chemical reactions are critical for the optimization of chemical conversion processes. It is well-known that different geometric configurations of surface atoms on supported metal nanoparticles have different catalytic reactivity and that the adsorption of reactive species can cause reconstruction of metal surfaces. Thus, characterizing metallic surface structures under reaction conditions at atomic scale is critical for understanding reactivity...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28252668/aggretin-venom-polypeptide-as-a-novel-anti-angiogenesis-agent-by-targeting-integrin-alpha2beta1
#9
Ching Hu Chung, Chien Hsin Chang, Chun Chieh Hsu, Kung Tin Lin, Hui Chin Peng, Tur Fu Huang
VEGF and VEGFR antibodies have been used as a therapeutic strategy to inhibit angiogenesis in many diseases; however, frequent and repeated administration of these antibodies to patients induces immunogenicity. In previous studies, we demonstrated that aggretin, a heterodimeric snake venom C-type lectin, exhibits pro-angiogenic activities via integrin α2β1 ligation. We hypothesised that small-mass aggretin fragments may bind integrin α2β1 and act as antagonists of angiogenesis. In this study, the anti-angiogenic efficacy of a synthesised aggretin α-chain C-terminus (AACT, residue 106-136) was evaluated in both in vitro and in vivo angiogenesis models...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28218920/a-non-volatile-organic-electrochemical-device-as-a-low-voltage-artificial-synapse-for-neuromorphic-computing
#10
Yoeri van de Burgt, Ewout Lubberman, Elliot J Fuller, Scott T Keene, Grégorio C Faria, Sapan Agarwal, Matthew J Marinella, A Alec Talin, Alberto Salleo
The brain is capable of massively parallel information processing while consuming only ∼1-100 fJ per synaptic event. Inspired by the efficiency of the brain, CMOS-based neural architectures and memristors are being developed for pattern recognition and machine learning. However, the volatility, design complexity and high supply voltages for CMOS architectures, and the stochastic and energy-costly switching of memristors complicate the path to achieve the interconnectivity, information density, and energy efficiency of the brain using either approach...
February 20, 2017: Nature Materials
https://www.readbyqxmd.com/read/28207953/sgs1-a-neomorphic-nac52-allele-impairing-ptgs-through-sgs3-down-regulation
#11
Nicolas Butel, Ivan Le Masson, Nathalie Bouteiller, Hervé Vaucheret, Taline Elmayan
Post-transcriptional gene silencing (PTGS) is a defense mechanism that targets invading nucleic acids from endogenous (transposons) or exogenous (pathogens, transgenes) origins. Genetic screens based on the reactivation of silenced transgenes have long been used to identify cellular PTGS components and regulators. Here we show that the first isolated PTGS-deficient mutant, sgs1, is impaired in the transcription factor NAC52. This mutant exhibits striking similarities with a mutant impaired in the H3K4me3 demethylase JMJ14 isolated from the same genetic screen...
February 16, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28183734/skap2-is-required-for-%C3%AE-2-integrin-mediated-neutrophil-recruitment-and-functions
#12
Mark Boras, Stephanie Volmering, Arne Bokemeyer, Jan Rossaint, Helena Block, Bernadette Bardel, Veerle Van Marck, Barbara Heitplatz, Stefanie Kliche, Annegret Reinhold, Clifford Lowell, Alexander Zarbock
Integrin activation is required for neutrophil functions. Impaired integrin activation on neutrophils is the hallmark of leukocyte adhesion deficiency (LAD) syndrome in humans, characterized by impaired leukocyte recruitment and recurrent infections. The Src kinase-associated phosphoprotein 2 (Skap2) is involved in integrin functions in different leukocyte subtypes. However, the role of Skap2 in β2 integrin activation and neutrophil recruitment is unknown. In this study, we demonstrate the crucial role of Skap2 in regulating actin polymerization and binding of talin-1 and kindlin-3 to the β2 integrin cytoplasmic domain, thereby being indispensable for β2 integrin activation and neutrophil recruitment...
March 6, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28157452/activated-%C3%AE-2-integrins-restrict-neutrophil-recruitment-during-murine-acute-pseudomonal-pneumonia
#13
Zachary S Wilson, Lawrence B Ahn, William S Serratelli, Matthew D Belley, Joanne Lomas-Neira, Mehmet Sen, Craig T Lefort
Rapid neutrophil recruitment is critical for the efficient clearance of bacterial pathogens from the lungs. While β2 integrins and their activation are required for neutrophil recruitment from postcapillary venules of the systemic circulation into inflamed tissues, the involvement of integrins in neutrophil recruitment in response to respiratory infection varies between bacterial pathogens. For stimuli eliciting β2 integrin-dependent neutrophil influx, including Pseudomonas aeruginosa, it remains unclear whether the activation of β2 integrins is an essential step in this process...
February 3, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28155884/the-molecular-basis-of-talin2-s-high-affinity-toward-%C3%AE-1-integrin
#14
Yaxia Yuan, Liqing Li, Yanyan Zhu, Lei Qi, Latifeh Azizi, Vesa P Hytönen, Chang-Guo Zhan, Cai Huang
Talin interacts with β-integrin tails and actin to control integrin activation, thus regulating focal adhesion dynamics and cell migration. There are two talin genes, Tln1 and Tln2, which encode talin1 and talin2, and it is generally believed that talin2 functions redundantly with talin1. However, we show here that talin2 has a higher affinity to β1-integrin tails than talin1. Mutation of talin2 S339 to leucine, which can cause Fifth Finger Camptodactyly, a human genetic disease, completely disrupted its binding to β-integrin tails...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28135265/%C3%AE-integrin-de-phosphorylation-by-the-density-enhanced-phosphatase-dep-1-attenuates-egfr-signaling-in-c-elegans
#15
Michael Walser, Christoph Alois Umbricht, Erika Fröhli, Paolo Nanni, Alex Hajnal
Density-Enhanced Phosphatase-1 (DEP-1) de-phosphorylates various growth factor receptors and adhesion proteins to regulate cell proliferation, adhesion and migration. Moreover, dep-1/scc1 mutations have been detected in various types of human cancers, indicating a broad tumor suppressor activity. During C. elegans development, DEP-1 mediates binary cell fate decisions by negatively regulating EGFR signaling. Using a substrate-trapping DEP-1 mutant in a proteomics approach, we have identified the C. elegans β-integrin subunit PAT-3 as a specific DEP-1 substrate...
January 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28131835/nano-mechanical-characterization-of-tension-sensitive-helix-bundles-in-talin-rod
#16
Koichiro Maki, Nobuhiko Nakao, Taiji Adachi
Tension-induced exposure of a cryptic signaling binding site is one of the most fundamental mechanisms in molecular mechanotransduction. Helix bundles in rod domains of talin, a tension-sensing protein at focal adhesions, unfurl under tension to expose cryptic vinculin binding sites. Although the difference in their mechanical stabilities would determine which helix bundle is tension-sensitive, their respective mechanical behaviors under tension have not been characterized. In this study, we evaluated the mechanical behaviors of residues 486-654 and 754-889 of talin, which form helix bundles with low and high tension-sensitivity, by employing AFM nano-tensile testing...
January 25, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28117756/talin-modulation-by-a-synthetic-n-acylurea-derivative-reduces-angiogenesis-in-human-endothelial-cells
#17
I-Rang Lim, Hyung Joon Joo, Minseon Jeong, Jong-Ho Kim, Seung-Cheol Choi, Chungho Kim, Jong-Wha Jung, Soon Jun Hong
Talin is a focal adhesion protein that activates integrins and recruits other focal adhesion proteins. Talin regulates the interactions between integrins and the extracellular matrix, which are critical for endothelial cells during angiogenesis. In this study, we successfully synthesized a novel talin modulator, N-((2-(1H-indol-3-yl)ethyl)carbamoyl)-2-(benzo[d][1,3]dioxol-5-yloxy)acetamide, referred to as KCH-1521. KCH-1521 was determined to bind talin and modulate downstream signaling molecules of talin. After 24 h of treatment, KCH-1521 changed the cell morphology of human umbilical vein endothelial cells (HUVECs) and reduced focal adhesion protein expression including vinculin and paxillin...
January 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28101696/role-of-the-helix-in-talin-f3-domain-f3-helix-in-talin-mediated-integrin-activation
#18
Ang Li, Qiang Guo, Ailin Wei, Yaliang Zhou, Weiming Hu
Increases in ligand binding to cellular integrins (activation) play an important role in platelet and leukocyte function. Talin is necessary in vivo and sufficient in vitro for integrin αIIbβ3 activation. The precise mechanisms by which talin activates integrin are still being elucidated. In particular, talin undergoes conformational changes (around the F3 helix) and inserts the F3 helix into lipid bilayer; however, the connection between this lipid-inserting mechanism of talin and talin's capacity to activate integrin has never been explored before...
March 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28099903/talin-1-interaction-network-promotes-hepatocellular-carcinoma-progression
#19
Peng Chen, Xiaohu Zheng, Yonggang Zhou, Yechuan Xu, Lixin Zhu, Yeben Qian
Talin-1 is a known oncogene-associated protein. In this study, we set out to determine its role and mechanisms in hepatocellular carcinoma (HCC) progression. We found Talin-1 to be highly expressed in HCC cells relative to non-cancer liver epithelial cells and to promote tumor growth and metastasis. We used Whole Human Genome Oligo Microarray analysis with HCC cells and HCC cells in which Talin-1 was knocked down using shRNA to identify transcripts regulated by Talin-1. Of the 40,000 tested genes, 3099 were differentially expressed after Talin-1 knockdown; expression of 1924 genes was increased, while expression of 2175 was decreased...
January 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28096216/basal-filopodia-and-vascular-mechanical-stress-organize-fibronectin-into-pillars-bridging-the-mesoderm-endoderm-gap
#20
Yuki Sato, Kei Nagatoshi, Ayumi Hamano, Yuko Imamura, David Huss, Seiichi Uchida, Rusty Lansford
Cells may exchange information with other cells and tissues by exerting forces on the extracellular matrix (ECM). Fibronectin (FN) is an important ECM component that forms fibrils through cell contacts and creates directionally biased geometry. Here, we demonstrate that FN is deposited as pillars between widely separated germ layers, namely the somitic mesoderm and the endoderm, in quail embryos. Alongside the FN pillars, long filopodia protrude from the basal surfaces of somite epithelial cells. Loss-of-function of Ena/VASP, α5β1-integrins or talin in the somitic cells abolished the FN pillars, indicating that FN pillar formation is dependent on the basal filopodia through these molecules...
January 15, 2017: Development
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