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https://www.readbyqxmd.com/read/28102353/cofilin-regulates-nuclear-architecture-through-a-myosin-ii-dependent-mechanotransduction-module
#1
O'Neil Wiggan, Bryce Schroder, Diego Krapf, James R Bamburg, Jennifer G DeLuca
Structural features of the nucleus including shape, size and deformability impact its function affecting normal cellular processes such as cell differentiation and pathological conditions such as tumor cell migration. Despite the fact that abnormal nuclear morphology has long been a defining characteristic for diseases such as cancer relatively little is known about the mechanisms that control normal nuclear architecture. Mounting evidence suggests close coupling between F-actin cytoskeletal organization and nuclear morphology however, mechanisms regulating this coupling are lacking...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101575/identification-of-potential-targets-for-differentiation-in-human-leukemia-cells-induced-by-diallyl-disulfide
#2
Hui Ling, Jie He, Hui Tan, Lan Yi, Fang Liu, Xiaoxia Ji, Youhua Wu, Haobin Hu, Xi Zeng, Xiaohong Ai, Hao Jiang, Qi Su
Diallyl disulfide (DADS) is a primary component of garlic, which has chemopreventive potential. We previously found that moderate doses (15-120 µM) of DADS induced apoptosis and G2/M phase cell cycle arrest. In this study, we observed the effect of low doses (8 µM) of DADS on human leukemia HL-60 cells. We found that DADS could inhibit proliferation, migration and invasion in HL-60 cells, and arrested cells at G0/G1 stage. Then, cell differentiation was displayed by morphologic observation, NBT reduction activity and CD11b evaluation of cytometric flow...
February 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28098159/fluid-shear-stress-activates-yap1-to-promote-cancer-cell-motility
#3
Hyun Jung Lee, Miguel F Diaz, Katherine M Price, Joyce A Ozuna, Songlin Zhang, Eva M Sevick-Muraca, John P Hagan, Pamela L Wenzel
Mechanical stress is pervasive in egress routes of malignancy, yet the intrinsic effects of force on tumour cells remain poorly understood. Here, we demonstrate that frictional force characteristic of flow in the lymphatics stimulates YAP1 to drive cancer cell migration; whereas intensities of fluid wall shear stress (WSS) typical of venous or arterial flow inhibit taxis. YAP1, but not TAZ, is strictly required for WSS-enhanced cell movement, as blockade of YAP1, TEAD1-4 or the YAP1-TEAD interaction reduces cellular velocity to levels observed without flow...
January 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28096546/ma026-an-anti-hepatitis-c-virus-compound-opens-tight-junctions-of-the-epithelial-cell-membrane
#4
Yusuke Kanda, Youhei Yamasaki, Satomi Shimura, Shinji Kamisuki, Fumio Sugawara, Yoko Nagumo, Takeo Usui
MA026 is an antiviral natural compound against hepatitis C virus (HCV). It was recently reported that MA026 binds claudin-1 (CLDN1) and inhibits HCV infection. Although CLDN1 is an important component of tight junctions (TJ) in the epithelial cell layer, the effects of MA026 on the TJ barrier function remained to be revealed. Here we report that MA026 irreversibly opens the TJ. MA026 irreversibly increased FD4 permeability and decreased transepithelial electrical resistance (TER) for at least 5 h. Although MA026 increased Ca(2+) influx in layered MDCKII cells, the Ca(2+) influx was less than that of capsaicin, a reversible TJ opener...
January 18, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28074884/actin-interacting-protein-1-contributes-to-intranuclear-rod-assembly-in-dictyostelium-discoideum
#5
Hellen C Ishikawa-Ankerhold, Wioleta Daszkiewicz, Michael Schleicher, Annette Müller-Taubenberger
Intranuclear rods are aggregates consisting of actin and cofilin that are formed in the nucleus in consequence of chemical or mechanical stress conditions. The formation of rods is implicated in a variety of pathological conditions, such as certain myopathies and some neurological disorders. It is still not well understood what exactly triggers the formation of intranuclear rods, whether other proteins are involved, and what the underlying mechanisms of rod assembly or disassembly are. In this study, Dictyostelium discoideum was used to examine appearance, stages of assembly, composition, stability, and dismantling of rods...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28062501/p2y12-promotes-migration-of-vascular-smooth-muscle-cells-through-cofilin-dephosphorylation-during-atherogenesis
#6
Xuan Niu, Shu-Lan Pi, Suraj Baral, Yuan-Peng Xia, Quan-Wei He, Ya-Nan Li, Hui-Juan Jin, Man Li, Meng-Die Wang, Ling Mao, Bo Hu
OBJECTIVE: P2Y12 is a well-recognized receptor expressed on platelets and the target of thienopyridine-type antiplatelet drugs. However, recent evidence suggests that P2Y12 expressed in vessel wall plays a role in atherogenesis, but the mechanisms remain elusive. In this study, we examined the molecular mechanisms of how vessel wall P2Y12 mediates vascular smooth muscle cells (VSMCs) migration and promotes the progression of atherosclerosis. APPROACH AND RESULTS: Using a high-fat diet-fed ApoE knockout mice model, we found that the expression of P2Y12 in VSMCs increased in a time-dependent manner and had a linear relationship with the plaque area...
January 5, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28025492/cofilin-1-and-other-adf-cofilin-superfamily-members-in-human-malignant-cells
#7
REVIEW
Sergey Shishkin, Lidia Eremina, Natalya Pashintseva, Leonid Kovalev, Marina Kovaleva
Identification of actin-depolymerizing factor homology (ADF-H) domains in the structures of several related proteins led first to the formation of the ADF/cofilin family, which then expanded to the ADF/cofilin superfamily. This superfamily includes the well-studied cofilin-1 (Cfl-1) and about a dozen different human proteins that interact directly or indirectly with the actin cytoskeleton, provide its remodeling, and alter cell motility. According to some data, Cfl-1 is contained in various human malignant cells (HMCs) and is involved in the formation of malignant properties, including invasiveness, metastatic potential, and resistance to chemotherapeutic drugs...
December 22, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27994054/trp-asp-wd-repeat-domain-1-is-essential-for-mouse-peri-implantation-development-and-regulates-cofilin-phosphorylation
#8
Yi Xiao, Haixia Ma, Ping Wan, Dandan Qin, Xiaoxiao Wang, Xiaoxin Zhang, Yunlong Xiang, Wenbo Liu, Jiong Chen, Zhaohong Yi, Lei Li
Trp-Asp (WD) repeat domain 1 (WDR1) is a highly conserved actin binding protein across all eukaryotes and is involved in numerous actin-based processes by accelerating Cofilin severing actin filament. However, the function and the mechanism of WDR1 in mammalian early development are still largely unclear. We now report that WDR1 is essential for mouse peri-implantation development and regulates Cofilin phosphorylation in mouse cells. The disruption of maternal WDR1 does not obviously affect ovulation and female fertility...
December 19, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27978504/redox-guided-axonal-regrowth-requires-cyclic-gmp-dependent-protein-kinase-1-implication-for-neuropathic-pain
#9
Lucie Valek, Annett Häussler, Stefan Dröse, Philipp Eaton, Katrin Schröder, Irmgard Tegeder
Cyclic GMP-dependent protein kinase 1 (PKG1) mediates presynaptic nociceptive long-term potentiation (LTP) in the spinal cord and contributes to inflammatory pain in rodents but the present study revealed opposite effects in the context of neuropathic pain. We used a set of loss-of-function models for in vivo and in vitro studies to address this controversy: peripheral neuron specific deletion (SNS-PKG1(-/-)), inducible deletion in subsets of neurons (SLICK-PKG1(-/-)) and redox-dead PKG1 mutants. In contrast to inflammatory pain, SNS-PKG1(-/-) mice developed stronger neuropathic hyperalgesia associated with an impairment of nerve regeneration, suggesting specific repair functions of PKG1...
December 7, 2016: Redox Biology
https://www.readbyqxmd.com/read/27958762/cd47-and-nox1-mediate-dynamic-fluid-phase-macropinocytosis-of-native-ldl
#10
Gabor Csanyi, Douglas M Feck, Pushpankur Ghoshal, Bhupesh Singla, Hui-Ping Lin, Shanmugam Nagarajan, Daniel N Meijles, Imad Al Ghouleh, Nadiezhda Cantu-Medellin Cantu-Medellin, Eric E Kelley, Lukasz Mateuszuk Mateuszuk, Jeffrey S Isenberg, Simon C Watkins, Patrick J Pagano
AIMS: Macropinocytosis has been implicated in cardiovascular and other disorders yet the physiological factors that initiate fluid-phase internalization and the signaling mechanisms involved remain poorly identified. The present study was designed to examine whether matrix protein thrombospondin-1 (TSP1) stimulates macrophage macropinocytosis and, if so, to investigate the potential signaling mechanism involved. RESULTS: TSP1 treatment of human and murine macrophages stimulated membrane ruffle formation and pericellular solute internalization by macropinocytosis...
December 13, 2016: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/27922676/identification-of-functional-pathways-associated-with-the-conditional-ablation-of-serum-response-factor-in-dstncorn1-mice
#11
Yanan Huo, Xin Xie, Bo Jiang
The aim of the present study was to investigate the signaling pathways associated with functional alterations in corneal tissues following the conditional ablation of serum response factor (Srf) in Dstncorn1 mice. The gene expression profiling array GSE49688, which includes 3 samples each from the wild‑type (WT), Dstncorn1 mutant (corn1) and corn1 mice following the conditional ablation of Srf from the corneal epithelium [namely rescued (res)] mouse groups, was downloaded from the Gene Expression Omnibus database...
January 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27917311/rock-inhibition-promotes-attachment-proliferation-and-wound-closure-in-human-embryonic-stem-cell-derived-retinal-pigmented-epithelium
#12
Roxanne H Croze, William J Thi, Dennis O Clegg
PURPOSE: Nonexudative (dry) age-related macular degeneration (AMD), a leading cause of blindness in the elderly, is associated with the loss of retinal pigmented epithelium (RPE) cells and the development of geographic atrophy, which are areas devoid of RPE cells and photoreceptors. One possible treatment option would be to stimulate RPE attachment and proliferation to replace dying/dysfunctional RPE and bring about wound repair. Clinical trials are underway testing injections of RPE cells derived from pluripotent stem cells to determine their safety and efficacy in treating AMD...
November 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/27914009/serum-response-factor-srf-ablation-interferes-with-acute-stress-associated-immediate-and-long-term-coping-mechanisms
#13
Annemarie Zimprich, Gabi Mroz, Christopher Meyer Zu Reckendorf, Sofia Anastasiadou, Philip Förstner, Lillian Garrett, Sabine M Hölter, Lore Becker, Jan Rozman, Cornelia Prehn, Birgit Rathkolb, Kristin Moreth, Wolfgang Wurst, Thomas Klopstock, Martin Klingenspor, Jerzy Adamski, Eckhard Wolf, Raffi Bekeredjian, Helmut Fuchs, Valerie Gailus-Durner, Martin Hrabe de Angelis, Bernd Knöll
Stress experience modulates behavior, metabolism, and energy expenditure of organisms. One molecular hallmark of an acute stress response is a rapid induction of immediate early genes (IEGs) such as c-Fos and Egr family members. IEG transcription in neurons is mediated by the neuronal activity-driven gene regulator serum response factor (SRF). We show a first role of SRF in immediate and long-lasting acute restraint stress (AS) responses. For this, we employed a standardized mouse phenotyping protocol at the German Mouse Clinic (GMC) including behavioral, metabolic, and cardiologic tests as well as gene expression profiling to analyze the consequences of forebrain-specific SRF deletion in mice exposed to AS...
December 2, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27910925/thrombomodulin-regulates-monocye-differentiation-via-pkc%C3%AE-and-erk1-2-pathway-in-vitro-and-in-atherosclerotic-artery
#14
Chien-Sung Tsai, Yi-Wen Lin, Chun-Yao Huang, Chun-Min Shih, Yi-Ting Tsai, Nai-Wen Tsao, Chin-Sheng Lin, Chun-Che Shih, Hellen Jeng, Feng-Yen Lin
Thrombomodulin (TM) modulates the activation of protein C and coagulation. Additionally, TM regulates monocyte migration and inflammation. However, its role on monocyte differentiation is still unknown. We investigated the effects of TM on monocyte differentiation. First, we found that TM was increased when THP-1 cells were treated with phorbol-12-myristate-13-acetate (PMA). Overexpression of TM enhanced the macrophage markers, CD14 and CD68 expression in PMA-induced THP-1. TM siRNA depressed the PMA-induced increase of p21(Cip1/WAF1) via ERK1/2-NF-kB p65 signaling...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27895171/impairment-of-ccr6-and-cxcr3-th-cell-migration-in-hiv-1-infection-is-rescued-by-modulating-actin-polymerization
#15
Valentina Cecchinato, Enos Bernasconi, Roberto F Speck, Michele Proietti, Ulrike Sauermann, Gianluca D'Agostino, Gabriela Danelon, Tanja Rezzonico Jost, Fabio Grassi, Lorenzo Raeli, Franziska Schöni-Affolter, Christiane Stahl-Hennig, Mariagrazia Uguccioni
CD4(+) T cell repopulation of the gut is rarely achieved in HIV-1-infected individuals who are receiving clinically effective antiretroviral therapy. Alterations in the integrity of the mucosal barrier have been indicated as a cause for chronic immune activation and disease progression. In this study, we present evidence that persistent immune activation causes impairment of lymphocytes to respond to chemotactic stimuli, thus preventing their trafficking from the blood stream to peripheral organs. CCR6(+) and CXCR3(+) Th cells accumulate in the blood of aviremic HIV-1-infected patients on long-term antiretroviral therapy, and their frequency in the circulation positively correlates to levels of soluble CD14 in plasma, a marker of chronic immune activation...
January 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27872653/the-zuo-jin-wan-formula-induces-mitochondrial-apoptosis-of-cisplatin-resistant-gastric-cancer-cells-via-cofilin-1
#16
Qing-Feng Tang, Jian Sun, Hui Yu, Xiao-Jing Shi, Rong Lv, Hong-Chang Wei, Pei-Hao Yin
Despite the status of cisplatin (DDP) as a classical chemotherapeutic agent in the treatment of cancer, the development of multidrug resistance often leads to a failure of DDP therapy. Here we found that phosphorylated cofilin-1 (p-cofilin-1) was overexpressed in the DDP-resistant human gastric cancer cell lines SGC7901/DDP and BGC823/DDP, relative to the respective parent cell lines (SGC7901 and BGC823), and that DDP induced the dephosphorylation of p-cofilin-1 in both parent lines but not in the DDP-resistant lines...
2016: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/27866972/letrozole-regulates-actin-cytoskeleton-polymerization-dynamics-in-a-src-1-dependent-manner-in-the-hippocampus-of-mice
#17
Yangang Zhao, Yanlan Yu, Yuanyuan Zhang, Li He, Linli Qiu, Jikai Zhao, Mengying Liu, Jiqiang Zhang
In the hippocampus, local estrogens (E2) derived from testosterone that is catalyzed by aromatase play important roles in the regulation of hippocampal neural plasticity, but the underlying mechanisms remain unclear. The actin cytoskeleton contributes greatly to hippocampal synaptic plasticity; however, whether it is regulated by local E2 and the related mechanisms remain to be elucidated. In this study, we first examined the postnatal developmental profiles of hippocampal aromatase and specific proteins responsible for actin cytoskeleton dynamics...
November 17, 2016: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/27865840/a-pleckstrin-homology-like-domain-is-critical-for-f-actin-binding-and-cofilin-phosphatase-activity-of-slingshot-1
#18
Katsunori Takahashi, Haruka Okabe, Shin-Ichiro Kanno, Tomoaki Nagai, Kensaku Mizuno
Slingshot-1 (SSH1) is a protein phosphatase that specifically dephosphorylates and activates cofilin, an F-actin-severing protein. SSH1 binds to and co-localizes with F-actin, and the cofilin-phosphatase activity of SSH1 is markedly increased by binding to F-actin. In this study, we performed a secondary structure analysis of SSH1, which predicted the existence of a pleckstrin homology (PH)-like domain in the N-terminal region of SSH1. SSH1 also contains a DEK-C domain in the N-terminal region. The N-terminal fragment of SSH1 bound to and co-localized with F-actin, but mutation at Arg-96 or a Leu-His-Lys (LHK) motif in the PH-like domain reduced this activity...
January 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27863071/the-putative-involvement-of-actin-binding-proteins-and-cytoskeleton-proteins-in-pathological-mechanisms-of-ketamine-cystitis-revealed-by-a-prospective-pilot-study-using-proteomic-approaches
#19
Hsueh-Hui Yang, Wei-Jun Zhai, Hann-Chorng Kuo
PURPOSE: Ketamine-induced cystitis (KC) among chronic ketamine young abusers has increased dramatically and it has brought attention for Urologists. The underlying pathophysiological mechanism(s) of KC is still unclear. Therefore, the purpose of this study is to elucidate the possible pathophysiological mechanism(s) of KC through proteomic techniques. EXPERIMENTAL DESIGN: Bladder tissues are obtained from seven patients with KC, seven patients with interstitial cystitis/bladder pain syndrome, and five control subjects who underwent video-urodynamic study followed by augmentation enterocystoplasty to increase bladder capacity...
November 10, 2016: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/27852434/crenactin-forms-actin-like-double-helical-filaments-regulated-by-arcadin-2
#20
Thierry Izoré, Danguole Kureisaite-Ciziene, Stephen H McLaughlin, Jan Löwe
The similarity of eukaryotic actin to crenactin, a filament-forming protein from the crenarchaeon Pyrobaculum calidifontis supports the theory of a common origin of Crenarchaea and Eukaryotes. Monomeric structures of crenactin and actin are similar, although their filament architectures were suggested to be different. Here we report that crenactin forms bona fide double helical filaments that show exceptional similarity to eukaryotic F-actin. With cryo-electron microscopy and helical reconstruction we solved the structure of the crenactin filament to 3...
November 17, 2016: ELife
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