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https://www.readbyqxmd.com/read/28197168/expression-analysis-of-sound-vibration-regulated-genes-by-touch-treatment-in-arabidopsis
#1
Ritesh Ghosh, Mayank A Gururani, Lakshmi N Ponpandian, Ratnesh C Mishra, Soo-Chul Park, Mi-Jeong Jeong, Hanhong Bae
Sound vibration (SV) is considered to be a mechanical stimulus which gives rise to various physiological and molecular changes in plants. Previously, we identified 17 SV-regulated genes (SRGs) which were up-regulated by SV treatments in Arabidopsis. Here, we analyzed the expression pattern of similar genes after an exposure of 500 Hertz at 80 decibels, for various time periods. Simultaneously, we confirmed the SV-mediated expression of these genes under lighted condition as many of them were reported to be dark-induced...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28122455/high-throughput-simulations-reveal-membrane-mediated-effects-of-alcohols-on-mscl-gating
#2
Manuel N Melo, Clément Arnarez, Hendrik Sikkema, Neeraj Kumar, Martin Walko, Herman J C Berendsen, Armagan Kocer, Siewert J Marrink, Helgi I Ingólfsson
The mechanosensitive channels of large conductance (MscL) are bacterial membrane proteins that serve as last resort emergency release valves in case of severe osmotic downshock. Sensing bilayer tension, MscL channels are sensitive to changes in the bilayer environment and are, therefore, an ideal test case for exploring membrane protein coupling. Here, we use high-throughput coarse-grained molecular dynamics simulations to characterize MscL gating kinetics in different bilayer environments under the influence of alcohols...
February 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28096508/papers-of-note-in-nature-541-7636
#3
Nancy R Gough
This week's articles feature molecular mechanisms controlling metastasis, insights into heart and skeletal muscle regeneration, details of how to engineer a stomach from human stem cells, and the key role for a mechanosensitive channel in controlling respiration.
January 17, 2017: Science Signaling
https://www.readbyqxmd.com/read/28076814/gsmtx4-mechanism-of-inhibiting-mechanosensitive-ion-channels
#4
Radhakrishnan Gnanasambandam, Chiranjib Ghatak, Anthony Yasmann, Kazuhisa Nishizawa, Frederick Sachs, Alexey S Ladokhin, Sergei I Sukharev, Thomas M Suchyna
GsMTx4 is a spider venom peptide that inhibits cationic mechanosensitive channels (MSCs). It has six lysine residues that have been proposed to affect membrane binding. We synthesized six analogs with single lysine-to-glutamate substitutions and tested them against Piezo1 channels in outside-out patches and independently measured lipid binding. Four analogs had ∼20% lower efficacy than the wild-type (WT) peptide. The equilibrium constants calculated from the rates of inhibition and washout did not correlate with the changes in inhibition...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28076813/signatures-of-mechanosensitive-gating
#5
REVIEW
Richard G Morris
The question of how mechanically gated membrane channels open and close is notoriously difficult to address, especially if the protein structure is not available. This perspective highlights the relevance of micropipette-aspirated single-particle tracking-used to obtain a channel's diffusion coefficient, D, as a function of applied membrane tension, σ-as an indirect assay for determining functional behavior in mechanosensitive channels. While ensuring that the protein remains integral to the membrane, such methods can be used to identify not only the gating mechanism of a protein, but also associated physical moduli, such as torsional and dilational rigidity, which correspond to the protein's effective shape change...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28073835/mechanosensitive-transient-receptor-potential-vanilloid-4-regulates-dermatophagoides-farinae-induced-airway-remodeling-via-2-distinct-pathways-modulating-matrix-synthesis-and-degradation
#6
Farai Gombedza, Vinay Kondeti, Nosayba Al-Azzam, Stephanie Koppes, Ernest Duah, Prachi Patil, Madison Hexter, Daniel Phillips, Charles K Thodeti, Sailaja Paruchuri
Contributions of mechanical signals to airway remodeling during asthma are poorly understood. Transient receptor potential vanilloid 4 (TRPV4), a mechanosensitive ion channel, has been implicated in cardiac and pulmonary fibrosis; however, its role in asthma remains elusive. Employing a Dermatophagoides farinae-induced asthma model, we report here that TRPV4 knockout mice were protected from D. farinae-induced airway remodeling. Furthermore, lung fibroblasts that were isolated from TRPV4 knockout mice showed diminished differentiation potential compared with wild-type mice...
January 10, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28051349/a-suite-of-receptor-like-kinases-and-a-putative-mechano-sensitive-channel-are-involved-in-autoimmunity-and-plasma-membrane-based-defenses-in-arabidopsis
#7
Zhongqin Zhang, Chika Tateda, Shang-Chuan Jiang, Jay Shrestha, Joanna Jelenska, Dequantarius J Speed, Jean Greenberg
In plants, cell surface pattern recognition receptors (PRRs) provide a first line of defense against pathogens. Although each PRR recognizes a specific ligand, they share common signaling outputs such as callose and other cell wall-based defenses. Several PRRs are also important for callose induction in response to the defense signal salicylic acid (SA). The extent to which common components are needed for PRR signaling outputs is not known. The gain-of-function Arabidopsis mutant of ACCELERATED CELL DEATH6 (ACD6) acd6-1 shows constitutive callose production that partially depends on PRRs...
January 4, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28039570/different-transcriptional-profiling-between-senescent-and-non-senescent-human-coronary-artery-endothelial-cells-hcaecs-by-omeprazole-and-lansoprazole-treatment
#8
Laura Costarelli, Robertina Giacconi, Marco Malavolta, Andrea Basso, Francesco Piacenza, Mauro Provinciali, Marcello G Maggio, Andrea Corsonello, Fabrizia Lattanzio
Recent evidence suggests that high dose and/or long term use of proton pump inhibitors (PPIs) may increase the risk of adverse cardiovascular events in older patients, but mechanisms underlying these detrimental effects are not known. Taking into account that the senescent endothelial cells have been implicated in the genesis or promotion of age-related cardiovascular disease, we hypothesized an active role of PPIs in senescent cells. The aim of this study is to investigate the changes in gene expression occurring in senescent and non-senescent human coronary artery endothelial cells (HCAECs) following Omeprazole (OPZ) or Lansoprazole (LPZ) treatment...
December 30, 2016: Biogerontology
https://www.readbyqxmd.com/read/28036174/mechanosensitive-gold-colloidal-membranes-mediated-by-supramolecular-interfacial-self-assembly
#9
João Paulo Coelho, María José Mayoral, Luis Camacho, María T Martín-Romero, Gloria Tardajos, Iván López-Montero, Eduardo Sanz, David Ávila-Brande, Juan José Giner-Casares, Gustavo Fernández, Andrés Guerrero-Martínez
The ability to respond toward mechanical stimuli is a fundamental property of biological organisms at both the macroscopic and cellular levels, yet it has been considerably less observed in artificial supramolecular and colloidal homologues. An archetypal example in this regard is cellular mechanosensation, a process by which mechanical forces applied on the cell membrane are converted into biochemical or electrical signals through nanometer-scale changes in molecular conformations. In this article, we report an artificial gold nanoparticle (Au NP)-discrete π-conjugated molecule hybrid system that mimics the mechanical behavior of biological membranes and is able to self-assemble into colloidal gold nanoclusters or membranes in a controlled and reversible fashion by changing the concentration or the mechanical force (pressure) applied...
January 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28018918/role-of-bkca-in-stretch-induced-relaxation-of-colonic-smooth-muscle
#10
Jie Ren, Fang Xin, Ping Liu, Hai-Yan Zhao, Si-Tao Zhang, Peng Han, Hai-Xia Huang, Wei Wang
Stretch-induced relaxation has not been clearly identified in gastrointestinal tract. The present study is to explore the role of large conductance calcium-activated potassium channels (BKCa) in stretch-induced relaxation of colon. The expression and currents of BKCa were detected and the basal muscle tone and contraction amplitude of colonic smooth muscle strips were measured. The expression of BKCa in colon is higher than other GI segments (P < 0.05). The density of BKCa currents was very high in colonic smooth muscle cells (SMCs)...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27976998/acetylated-tubulin-is-essential-for-touch-sensation-in-mice
#11
Shane J Morley, Yanmei Qi, Loredana Iovino, Laura Andolfi, Da Guo, Nereo Kalebic, Laura Castaldi, Christian Tischer, Carla Portulano, Giulia Bolasco, Kalyanee Shirlekar, Claudia M Fusco, Antonino Asaro, Federica Fermani, Mayya Sundukova, Ulf Matti, Luc Reymond, Adele De Ninno, Luca Businaro, Kai Johnsson, Marco Lazzarino, Jonas Ries, Yannick Schwab, Jing Hu, Paul A Heppenstall
At its most fundamental level, touch sensation requires the translation of mechanical energy into mechanosensitive ion channel opening, thereby generating electro-chemical signals. Our understanding of this process, especially how the cytoskeleton influences it, remains unknown. Here we demonstrate that mice lacking the α-tubulin acetyltransferase Atat1 in sensory neurons display profound deficits in their ability to detect mechanical stimuli. We show that all cutaneous afferent subtypes, including nociceptors have strongly reduced mechanosensitivity upon Atat1 deletion, and that consequently, mice are largely insensitive to mechanical touch and pain...
December 13, 2016: ELife
https://www.readbyqxmd.com/read/27974811/recessive-piezo2-stop-mutation-causes-distal-arthrogryposis-with-distal-muscle-weakness-scoliosis-and-proprioception-defects
#12
Goknur Haliloglu, Kerstin Becker, Cagri Temucin, Beril Talim, Nalan Küçükşahin, Matthias Pergande, Susanne Motameny, Peter Nürnberg, Ustun Aydingoz, Haluk Topaloglu, Sebahattin Cirak
The genetic work-up of arthrogryposis is challenging due to the diverse clinical and molecular etiologies. We report a-18(3/12)-year-old boy, from a 2nd degree consanguineous family, who presented at 3(6/12) years with hypotonia, distal laxity, contractures, feeding difficulties at birth. He required surgery for progressive scoliosis at 16 years of age, and walked independently since then with an unstable gait and coordination defects. His latest examination at 18 years of age revealed a proprioceptive defect and loss-of-joint position sense in the upper limbs...
December 15, 2016: Journal of Human Genetics
https://www.readbyqxmd.com/read/27941751/a-programmable-dna-origami-nanospring-that-reveals-force-induced-adjacent-binding-of-myosin-vi-heads
#13
M Iwaki, S F Wickham, K Ikezaki, T Yanagida, W M Shih
Mechanosensitive biological nanomachines such as motor proteins and ion channels regulate diverse cellular behaviour. Combined optical trapping with single-molecule fluorescence imaging provides a powerful methodology to clearly characterize the mechanoresponse, structural dynamics and stability of such nanomachines. However, this system requires complicated experimental geometry, preparation and optics, and is limited by low data-acquisition efficiency. Here we develop a programmable DNA origami nanospring that overcomes these issues...
December 12, 2016: Nature Communications
https://www.readbyqxmd.com/read/27940346/spectator-no-more-the-role-of-the-membrane-in-regulating-ion-channel-function
#14
REVIEW
Christos Pliotas, James H Naismith
A pressure gradient across a curved lipid bilayer leads to a lateral force within the bilayer. Following ground breaking work on eukaryotic ion channels, it is now known that many proteins sense this change in the lateral tension and alter their functions in response. It has been proposed that responding to pressure differentials may be one of the oldest signaling mechanisms in biology. The most well characterized mechanosensing ion channels are the bacterial ones which open when the pressure differential hits a threshold...
December 7, 2016: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/27935846/guardians-in-a-stressful-world-the-opu-family-of-compatible-solute-transporters-from-bacillus-subtilis
#15
Tamara Hoffmann, Erhard Bremer
The development of a semi-permeable cytoplasmic membrane was a key event in the evolution of microbial proto-cells. As a result, changes in the external osmolarity will inevitably trigger water fluxes along the osmotic gradient. The ensuing osmotic stress has consequences for the magnitude of turgor and will negatively impact cell growth and integrity. No microorganism can actively pump water across the cytoplasmic membrane; hence, microorganisms have to actively adjust the osmotic potential of their cytoplasm to scale and direct water fluxes in order to prevent dehydration or rupture...
February 1, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/27930505/increased-membrane-localization-of-pannexin1-in-human-corneal-synaptosomes-causes-enhanced-stimulated-atp-release-in-chronic-diabetes-mellitus
#16
Hao Cui, Ying Liu, Limin Qin, Liqiang Wang, Yifei Huang
In the present study, we investigated the potential changes in the corneal nerve terminals in non-insulin-dependent diabetes mellitus of moderate duration. The dissected corneas were subjected to a protocol of ultracentrifugation to obtain synaptosomes of sensory nerve terminals. Within these nerve varicosities, 2 major mechanisms were examined, viz., alterations of the mechanosensitive channel pannexin1 and ATP release on stimulation of these terminals. We hypothesized that altered cellular location and function of the pannexin channel may contribute to altered mechanosensitivity of the cornea, which in turn may affect wound healing and primary visual function of the cornea...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27913829/glutamate-fermentation-2-mechanism-of-l-glutamate-overproduction-in-corynebacterium-glutamicum
#17
Takashi Hirasawa, Masaaki Wachi
The nonpathogenic coryneform bacterium, Corynebacterium glutamicum, was isolated as an L-glutamate-overproducing microorganism by Japanese researchers and is currently utilized in various amino acid fermentation processes. L-Glutamate production by C. glutamicum is induced by limitation of biotin and addition of fatty acid ester surfactants and β-lactam antibiotics. These treatments affect the cell surface structures of C. glutamicum. After the discovery of C. glutamicum, many researchers have investigated the underlying mechanism of L-glutamate overproduction with respect to the cell surface structures of this organism...
December 3, 2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/27874267/human-digital-meissner-corpuscles-display-immunoreactivity-for-the-multifunctional-ion-channels-trpc6-and-trpv4
#18
Paula Alonso-González, Roberto Cabo, Isabel San José, Angel Gago, Iván C Suazo, Olivia García-Suárez, Juan Cobo, José A Vega
Ion channels are at the basis of the sensory processes including mechanosensing. Some members of the transient receptor potential (TRP) ion channel superfamily have been proposed as mechanosensors, but their putative role in mechanotransduction is controversial. Among them there are TRP canonical 6 (TRPC6) and TRP vanilloid 4 (TRPV4) ion channels, which are known to cooperate in mechanical hyperalgesia. Here, we investigated the occurrence, distribution, and possible colocalization of TRPC6 and TRPV4 in human digital Meissner sensory corpuscles using immunohistochemistry and double immunofluorescence (associate with markers for specific corpuscular constituents)...
November 22, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27861175/transient-receptor-potential-vanilloid-4-and-serum-glucocorticoid-regulated-kinase-1-are-critical-mediators-of-lung-injury-in-overventilated-mice-in-vivo
#19
Laura Michalick, Lasti Erfinanda, Ulrike Weichelt, Markus van der Giet, Wolfgang Liedtke, Wolfgang M Kuebler
BACKGROUND: Mechanical ventilation can cause lung endothelial barrier failure and inflammation cumulating in ventilator-induced lung injury. Yet, underlying mechanotransduction mechanisms remain unclear. Here, the authors tested the hypothesis that activation of the mechanosensitive Ca channel transient receptor potential vanilloid (TRPV4) by serum glucocorticoid-regulated kinase (SGK) 1 may drive the development of ventilator-induced lung injury. METHODS: Mice (total n = 54) were ventilated for 2 h with low (7 ml/kg) or high (20 ml/kg) tidal volumes and assessed for signs of ventilator-induced lung injury...
February 2017: Anesthesiology
https://www.readbyqxmd.com/read/27856251/local-calcium-signalling-is-mediated-by-mechanosensitive-ion-channels-in-mesenchymal-stem-cells
#20
Vladislav I Chubinskiy-Nadezhdin, Valeria Y Vasileva, Natalia A Pugovkina, Irina O Vassilieva, Elena A Morachevskaya, Nikolay N Nikolsky, Yuri A Negulyaev
Mechanical forces are implicated in key physiological processes in stem cells, including proliferation, differentiation and lineage switching. To date, there is an evident lack of understanding of how external mechanical cues are coupled with calcium signalling in stem cells. Mechanical reactions are of particular interest in adult mesenchymal stem cells because of their promising potential for use in tissue remodelling and clinical therapy. Here, single channel patch-clamp technique was employed to search for cation channels involved in mechanosensitivity in mesenchymal endometrial-derived stem cells (hMESCs)...
January 22, 2017: Biochemical and Biophysical Research Communications
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