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https://www.readbyqxmd.com/read/28228547/limch1-regulates-nonmuscle-myosin-ii-activity-and-suppresses-cell-migration
#1
Yu-Hung Lin, Yen-Yi Zhen, Kun-Yi Chien, I-Ching Lee, Wei-Chi Lin, Mei-Yu Chen, Li-Mei Pai
Nonmuscle myosin II (NM-II) is an important motor protein involved in cell migration. Incorporation of NM-II into actin stress fiber provides a traction force to promote actin retrograde flow and focal adhesion assembly. However, the components involved in regulation of NM-II activity are not well understood. Here, we identified a novel actin stress fiber-associated protein, LIM and calponin-homology domains 1 (LIMCH1), which regulates NM-II activity. The recruitment of LIMCH1 into contractile stress fibers revealed its localization complementary to actinin-1...
February 22, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28228418/folic-acid-supplementation-increases-cutaneous-vasodilator-sensitivity-to-sympathetic-nerve-activity-in-older-adults
#2
Anna E Stanhewicz, Jody L Greaney, Lacy M Alexander, W Larry Kenney
During heat stress, blunted increases in skin sympathetic nervous system activity (SSNA) and reductions in end-organ vascular responsiveness contribute to the age-related reduction in reflex cutaneous vasodilation. In older adults, folic acid supplementation improves the cutaneous vascular conductance (CVC) response to passive heating; however, the influence of folic acid supplementation on SSNA:CVC transduction is unknown. Fourteen older adults (66±1yrs, 8M/6F) ingested folic acid (5mg·day(-1)) or placebo for 6 weeks in a randomized, double-blind, crossover design...
February 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28226209/production-of-high-performance-bioinspired-silk-fibers-by-straining-flow-spinning
#3
Rodrigo Madurga, Alfonso M Ganan-Calvo, Gustavo Ramón Plaza, Gustavo V Guinea, Manuel Elices, José Pérez-Rigueiro
In the last years there has been an increasing interest on bioinspired approaches for different applications, including the spinning of high performance silk fibers. Bioinspired spinning is based on the natural spinning system of spiders and worms and requires combining changes in the chemical environment of the proteins with the application of mechanical stresses. Here we present the novel Straining Flow Spinning (SFS) process and prove its ability to produce high performance fibers under mild, environmentally friendly conditions, from aqueous protein dopes...
February 22, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28224971/biofabrication-of-bundles-of-poly-lactic-acid-collagen-blends-mimicking-the-fascicles-of-the-human-achille-tendon
#4
Alberto Sensini, Chiara Gualandi, Luca Cristofolini, Gianluca Tozzi, Manuela Dicarlo, Gabriella Teti, Monica Mattioli-Belmonte, Maria Letizia Focarete
Electrospinning is a promising technique for the production of scaffolds aimed at the regeneration of soft tissues. The aim of this work was to develop electrospun bundles mimicking the architecture and mechanical properties of the fascicles of the human Achille tendon. Two different blends of poly(L-lactic acid) (PLLA) and collagen (Coll) were tested, PLLA/Coll-75/25 and PLLA/Coll-50/50, and compared with bundles of pure PLLA. First, a complete physico-chemical characterization was performed on non-woven mats made of randomly arranged fibers...
February 22, 2017: Biofabrication
https://www.readbyqxmd.com/read/28220401/numerical-model-for-healthy-and-injured-ankle-ligaments
#5
Antonella Forestiero, Emanuele Luigi Carniel, Chiara Giulia Fontanella, Arturo Nicola Natali
The aim of this work is to provide a computational tool for the investigation of ankle mechanics under different loading conditions. The attention is focused on the biomechanical role of ankle ligaments that are fundamental for joints stability. A finite element model of the human foot is developed starting from Computed Tomography and Magnetic Resonance Imaging, using particular attention to the definition of ankle ligaments. A refined fiber-reinforced visco-hyperelastic constitutive model is assumed to characterize the mechanical response of ligaments...
February 20, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28220374/lipopolysaccharide-activates-toll-like-receptor-4-and-prevents-cardiac-fibroblast-to-myofibroblast-differentiation
#6
Samir Bolívar, Roxana Santana, Pedro Ayala, Rodolfo Landaeta, Pía Boza, Claudio Humeres, Raúl Vivar, Claudia Muñoz, Viviana Pardo, Samuel Fernandez, Renatto Anfossi, Guillermo Diaz-Araya
Bacterial lipopolysaccharide (LPS) is a known ligand of Toll-like receptor 4 (TLR4) which is expressed in cardiac fibroblasts (CF). Differentiation of CF to cardiac myofibroblasts (CMF) is induced by transforming growth factor-β1 (TGF-β1), increasing alpha-smooth muscle actin (α-SMA) expression. In endothelial cells, an antagonist effect between LPS-induced signaling and canonical TGF-β1 signaling was described; however, it has not been studied whether in CF and CMF the expression of α-SMA induced by TGF-β1 is antagonized by LPS and the mechanism involved...
February 20, 2017: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/28219806/structural-characterization-and-viscoelastic-constitutive-modeling-of-skin
#7
Vincent R Sherman, Yizhe Tang, Shiteng Zhao, Wen Yang, Marc A Meyers
: A fascinating material, skin has a tensile response which exhibits an extended toe region of minimal stress up to nominal strains that, in some species, exceed 1, followed by significant stiffening until a roughly linear region. The large toe region has been attributed to its unique structure, consisting of a network of curved collagen fibers. Investigation of the structure of rabbit skin reveals that it consists of layers of wavy fibers, each one with a characteristic orientation. Additionally, the existence of two preferred layer orientations is suggested based on the results of small angle x-ray scattering...
February 17, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28219413/effect-of-waxy-barley-kirarimochi-consumption-on-bowel-movements-of-late-stage-elderly-residents-at-roken-nursing-home
#8
Keiko Taniguchi, Kozo Komae, Asuka Takahashi, Toji Yoshioka, Yoshiaki Sone
BACKGROUND: It is very important for the late-stage elderly to have the least stressful bowel movements for maintaining a good quality of life. It is generally accepted that consuming adequate dietary fiber is a promising method for the prevention and management of stressful bowel movements such as those during constipation. Therefore, we examined the effect of long-term consumption of waxy barley, which is high in dietary fiber, on the bowel movements of the late-stage elderly living at Roken nursing home (a geriatric health services facility), Japan...
February 20, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28216579/a-plant-proteinase-inhibitor-from-enterolobium-contortisiliquum-attenuates-pulmonary-mechanics-inflammation-and-remodeling-induced-by-elastase-in-mice
#9
Osmar Aparecido Theodoro-Júnior, Renato Fraga Righetti, Rafael Almeida-Reis, Bruno Tadeu Martins-Oliveira, Leandro Vilela Oliva, Carla Máximo Prado, Beatriz Mangueira Saraiva-Romanholo, Edna Aparecida Leick, Nathalia Montouro Pinheiro, Yara Aparecida Lobo, Mílton de Arruda Martins, Maria Luiza Vilela Oliva, Iolanda de Fátima Lopes Calvo Tibério
Proteinase inhibitors have been associated with anti-inflammatory and antioxidant activities and may represent a potential therapeutic treatment for emphysema. Our aim was to evaluate the effects of a plant Kunitz proteinase inhibitor, Enterolobium contortisiliquum trypsin inhibitor (EcTI), on several aspects of experimental elastase-induced pulmonary inflammation in mice. C57/Bl6 mice were intratracheally administered elastase (ELA) or saline (SAL) and were treated intraperitoneally with EcTI (ELA-EcTI, SAL-EcTI) on days 1, 14 and 21...
February 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28216317/tropomyosin-isoforms-specify-functionally-distinct-actin-filament-populations-in%C3%A2-vitro
#10
Gergana Gateva, Elena Kremneva, Theresia Reindl, Tommi Kotila, Konstantin Kogan, Laurène Gressin, Peter W Gunning, Dietmar J Manstein, Alphée Michelot, Pekka Lappalainen
Actin filaments assemble into a variety of networks to provide force for diverse cellular processes [1]. Tropomyosins are coiled-coil dimers that form head-to-tail polymers along actin filaments and regulate interactions of other proteins, including actin-depolymerizing factor (ADF)/cofilins and myosins, with actin [2-5]. In mammals, >40 tropomyosin isoforms can be generated through alternative splicing from four tropomyosin genes. Different isoforms display non-redundant functions and partially non-overlapping localization patterns, for example within the stress fiber network [6, 7]...
February 14, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28213499/geometry-and-network-connectivity-govern-the-mechanics-of-stress-fibers
#11
Elena Kassianidou, Christoph A Brand, Ulrich S Schwarz, Sanjay Kumar
Actomyosin stress fibers (SFs) play key roles in driving polarized motility and generating traction forces, yet little is known about how tension borne by an individual SF is governed by SF geometry and its connectivity to other cytoskeletal elements. We now address this question by combining single-cell micropatterning with subcellular laser ablation to probe the mechanics of single, geometrically defined SFs. The retraction length of geometrically isolated SFs after cutting depends strongly on SF length, demonstrating that longer SFs dissipate more energy upon incision...
February 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28209981/fibulin-6-regulates-pro-fibrotic-tgf-%C3%AE-responses-in-neonatal-mouse-ventricular-cardiac-fibroblasts
#12
Arpita Chowdhury, Lisa Hasselbach, Frank Echtermeyer, Nidhi Jyotsana, Gregor Theilmeier, Christine Herzog
Fibulin-6, an essential component of extracellular matrix determines the architecture of cellular junctions in tissues undergoing strain. Increased expression and deposition of fibulin-6 facilitates fibroblast migration in response to TGF-β, following myocardial infarction in mouse heart. The underlying mechanism still remains elusive. In conjunction with our previous study, we have now demonstrated that in fibulin-6 knockdown (KD) fibroblasts, not only TGF-β dependent migration, but also stress fiber formation, cellular networking and subsequently fibroblast wound contraction is almost abrogated...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28199929/identification-of-natural-red-and-purple-dyes-on-textiles-by-fiber-optics-reflectance-spectroscopy
#13
M A Maynez-Rojas, E Casanova-González, J L Ruvalcaba-Sil
Understanding dye chemistry and dye processes is an important issue for studies of cultural heritage collections and science conservation. Fiber Optics Reflectance Spectroscopy (FORS) is a powerful technique, which allows preliminary dye identification, causing no damage or mechanical stress on the artworks subjected to analysis. Some information related to specific light scattering and absorption can be obtained in the UV-visible and infrared range (300-1400nm) and it is possible to discriminate the kind of support fiber in the near infrared region (1000-2500nm)...
February 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28199794/the-cellular-stress-response-of-rat-skeletal-muscle-following-lengthening-contractions
#14
Evan Pollock-Tahiri, Marius Locke
The cellular stress response (CSR) of the rat tibialis anterior (TA) muscle was investigated following 20, 40 or 60 lengthening contractions (LCs) using an in-vivo model of electrical stimulation. Muscles were removed at 0, 1, 3, or 24 hours after LCs and assessed for HSF activation, HSP content and/or morphological evidence of muscle fibre damage. When compared to the first muscle contraction, peak muscle torque was reduced by 26% (p<0.05) after 20 LCs and further reduced to 56% and 60% (p<0.001) after 40 and 60 LCs, respectively...
February 15, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28196728/the-atypical-rho-gtpase-rhod-is-a-regulator-of-actin-cytoskeleton-dynamics-and-directed-cell-migration
#15
Magdalena Blom, Katarina Reis, Johan Heldin, Johan Kreuger, Pontus Aspenström
RhoD belongs to the Rho GTPases, a protein family responsible for the regulation and organization of the actin cytoskeleton, and, consequently, many cellular processes like cell migration, cell division and vesicle trafficking. Here, we demonstrate that the actin cytoskeleton is dynamically regulated by increased or decreased protein levels of RhoD. Ectopic expression of RhoD has previously been shown to give an intertwined weave of actin filaments. We show that this RhoD-dependent effect is detected in several cell types and results in a less dynamic actin filament system...
February 11, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28196086/nopal-feeding-reduces-adiposity-intestinal-inflammation-and-shifts-the-cecal-microbiota-and-metabolism-in-high-fat-fed-rats
#16
Sofia Moran-Ramos, Xuan He, Elizabeth L Chin, Armando R Tovar, Nimbe Torres, Carolyn M Slupsky, Helen E Raybould
Nopal is a cactus plant widely consumed in Mexico that has been used in traditional medicine to aid in the treatment of type-2 diabetes. We previously showed that chronic consumption of dehydrated nopal ameliorated hepatic steatosis in obese (fa/fa) rats; however, description of the effects on other tissues is sparse. The aim of the present study was to investigate the effects of nopal cladode consumption on intestinal physiology, microbial community structure, adipose tissue, and serum biochemistry in diet-induced obese rats...
2017: PloS One
https://www.readbyqxmd.com/read/28195168/taz-contributes-to-pulmonary-fibrosis-by-activating-profibrotic-functions-of-lung-fibroblasts
#17
Satoshi Noguchi, Akira Saito, Yu Mikami, Hirokazu Urushiyama, Masafumi Horie, Hirotaka Matsuzaki, Hideyuki Takeshima, Kosuke Makita, Naoya Miyashita, Akihisa Mitani, Taisuke Jo, Yasuhiro Yamauchi, Yasuhiro Terasaki, Takahide Nagase
Transcriptional coactivator with PDZ-binding motif (TAZ) regulates a variety of biological processes. Nuclear translocation and activation of TAZ are regulated by multiple mechanisms, including actin cytoskeleton and mechanical forces. TAZ is involved in lung alveolarization during lung development and Taz-heterozygous mice are resistant to bleomycin-induced lung fibrosis. In this study, we explored the roles of TAZ in the pathogenesis of idiopathic pulmonary fibrosis (IPF) through histological analyses of human lung tissues and cell culture experiments...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28192301/dynamic-interaction-between-actin-and-nesprin2-maintain-the-cell-nucleus-in-a-prestressed-state
#18
Abhishek Kumar, G V Shivashankar
Mechanical coupling between the nucleus and the cytoskeleton is indispensable for direct force transduction from the extra cellular matrix (ECM) to the chromatin. Although this physical coupling has been shown to be crucial for nuclear positioning and its function, the quantification of nuclear-cytoskeleton interaction has been lacking. In this paper, using various quantitative fluorescence spectroscopy techniques, we investigate the nature of this connection. High-resolution 3D imaging shows that nesprin2G forms short linear structures along actin stress fibers (ASFs) in the apical region of the nucleus...
November 11, 2016: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28191922/synergistic-integration-of-experimental-and-simulation-approaches-for-the-de-novo-design-of-silk-based-materials
#19
Wenwen Huang, Davoud Ebrahimi, Nina Dinjaski, Anna Tarakanova, Markus J Buehler, Joyce Y Wong, David L Kaplan
Tailored biomaterials with tunable functional properties are crucial for a variety of task-specific applications ranging from healthcare to sustainable, novel bio-nanodevices. To generate polymeric materials with predictive functional outcomes, exploiting designs from nature while morphing them toward non-natural systems offers an important strategy. Silks are Nature's building blocks and are produced by arthropods for a variety of uses that are essential for their survival. Due to the genetic control of encoded protein sequence, mechanical properties, biocompatibility, and biodegradability, silk proteins have been selected as prototype models to emulate for the tunable designs of biomaterial systems...
February 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28188891/3-2-deoxy-%C3%AE-d-erythro-pentafuranosyl-pyrimido-1-2-%C3%AE-purin-10-3h-one-deoxyguanosine-adducts-of-workers-exposed-to-asbestos-fibers
#20
Stefano Bonassi, Filippo Cellai, Armelle Munnia, Donatella Ugolini, Alfonso Cristaudo, Monica Neri, Mirta Milić, Alessandra Bonotti, Roger W Giese, Marco E M Peluso
Asbestos is the commercial name for a group of silicate minerals naturally occurring in the environment and widely used in the industry. Asbestos exposure has been associated with pulmonary fibrosis, mesothelioma, and malignancies, which may appear after a period of latency of 20-40 years. Mechanisms involved in the carcinogenic effects of asbestos are still not fully elucidated, although the oxidative stress theory suggests that phagocytic cells produce large amounts of reactive oxygen species, due to their inability to digest asbestos fiber...
February 7, 2017: Toxicology Letters
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