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https://www.readbyqxmd.com/read/29660346/wash-free-and-selective-imaging-of-epithelial-cell-adhesion-molecule-epcam-expressing-cells-with-fluorogenic-peptide-ligands
#1
K C Tara Bahadur, Kanako Suga, Takashi Isoshima, Toshiro Aigaki, Yoshihiro Ito, Kiyotaka Shiba, Takanori Uzawa
Detection of the cells expressing an epithelial cell adhesion molecule (EpCAM) is a crucial step to identify circulating tumor cells (CTCs) from blood. To detect the EpCAM, we here designed and synthesized a series of fluorogenic peptides. Specifically, we functionalized an EpCAM-binding peptide, Ep114, by replacing its amino acids to an aminophenylalanine that was modified with environmentally sensitive 7-nitro-2,1,3-benzoxadiazole (NBD-amPhe). Among six synthesized peptides, we have found that two peptides, Q4X and V6X (X represents NBD-amPhe), retain the Ep114's binding ability and specifically mark EpCAM-expressing cells by just adding these peptides to the cultivation medium...
April 13, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29644148/differential-deposition-of-fluorescently-tagged-cholesterol-on-commercial-contact-lenses-using-a-novel-in-vitro-eye-model
#2
Hendrik Walther, Chau-Minh Phan, Lakshman N Subbaraman, Lyndon Jones
Purpose: We evaluate the differences in lipid uptake and penetration in daily disposable (DD) contact lenses (CL) using a conventional "in-vial" method compared to a novel in vitro eye model. Methods: The penetration of fluorescently labelled 22-(N-(7-Nitrobenz-2-Oxa-1,3-Diazol-4-yl)Amino)-23,24-Bisnor-5-Cholen-3beta-Ol (NBD)-cholesterol on three silicone hydrogel (SH) and four conventional hydrogel (CH) DD CLs were investigated. CLs were incubated for 4 and 12 hours in a vial, containing 3...
April 2018: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29643833/-in-vivo-confocal-microscopic-evaluation-of-corneal-nerve-fibers-and-dendritic-cells-in-patients-with-beh%C3%A3-et-s-disease
#3
Gulfidan Bitirgen, Emine Tinkir Kayitmazbatir, Gunhal Satirtav, Rayaz A Malik, Ahmet Ozkagnici
Central and peripheral nervous system involvement may occur during the course of Behçet's disease (BD). In vivo corneal confocal microscopy (CCM) can detect corneal small fiber damage and immune cell density. The aim of this study was to assess central corneal sensitivity, corneal subepithelial nerve plexus morphology and dendritic cell (DC) density in patients with BD. Forty-nine consecutive patients with BD and 30 healthy control subjects were included in this cross-sectional study conducted at a tertiary referral university hospital...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29625335/cerebrospinal-fluid-il-10-as-an-early-stage-discriminative-marker-between-multiple-sclerosis-and-neuro-beh%C3%A3-et-disease
#4
Meriam Belghith, Khadija Bahrini, Mariem Kchaou, Olfa Maghrebi, Samir Belal, Mohamed Ridha Barbouche
Multiple Sclerosis (MS) and Neuro-Behçet's Disease (NBD) are two recurrent disorders affecting the central nervous system (CNS) by causing inflammation and irreversible damage. Inaugural clinical symptoms for both diseases might be very similar and definitive diagnosis could be delayed. The present study aimed to find out possible differences at early stages in the transcription factors/cytokines expression profiles in blood and cerebrospinal fluid (CSF) of MS and NBD patients which could be useful discriminative markers...
April 3, 2018: Cytokine
https://www.readbyqxmd.com/read/29624050/zwitterionic-rhodium-and-iridium-complexes-based-on-a-carboxylate-bridge-functionalized-bis-n-heterocyclic-carbene-ligand-synthesis-structure-dynamic-behavior-and-reactivity
#5
Raquel Puerta-Oteo, M Victoria Jiménez, Fernando J Lahoz, F Javier Modrego, Vincenzo Passarelli, Jesús J Pérez-Torrente
A series of water-soluble zwitterionic complexes featuring a carboxylate bridge-functionalized bis-N-heterocyclic carbene ligand of formula [Cp*MIII Cl{(MeIm)2 CHCOO}] and [MI (diene){(MeIm)2 CHCOO}] (Cp* = 1,2,3,4,5-pentamethylcyclopentadienyl; M = Rh, Ir; MeIm = 3-methylimidazol-2-yliden-1-yl; diene = 1,5-cyclooctadiene (cod), norbornadiene (nbd)) were prepared from the salt [(MeImH)2 CHCOO]Br and suitable metal precursor. The solid-state structure of both types of complexes shows a boat-shaped six-membered metallacycle derived of the κ2 C,C' coordination mode of the bis-NHC ligand...
April 6, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29596976/nbd-bpea-regulates-zn-2-or-cu-2-induced-a%C3%AE-40-aggregation-and-cytotoxicity
#6
Tingting Chen, Yuanyuan Zhang, Yanfang Shang, Xuefang Gu, Yue Zhu, Li Zhu
Abnormal interaction of amyloid-β peptide (Aβ) and metal ions is proved to be related to the etiology of Alzheimer's disease (AD). Using metal chelators to reverse metal-triggered Aβ aggregation has become one of the potential therapies for AD. In our work, the effect of metal chelator, NBD-BPEA, on Zn2+ - or Cu2+ -mediated Aβ40 aggregation and neurotoxicity has been systematically studied. NBD-BPEA exhibits the capability to inhibit the metal-mediated Aβ40 aggregation and disassemble performed Aβ40 aggregates...
March 26, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29567309/why-national-biomechanics-day
#7
Paul DeVita
National Biomechanics Day (NBD) seeks to expand the influence and impact of Biomechanics on our society by expanding the awareness of Biomechanics among young people. NBD will manifest this goal through worldwide, synchronized and coordinated celebrations and demonstrations of all things Biomechanics with high school students. NBD invites all Biomechanists to participate in NBD 2018, http://nationalbiomechanicsday.asbweb.org/.
March 14, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29550876/refining-protein-penetration-into-the-lipid-bilayer-using-fluorescence-quenching-and-molecular-dynamics-simulations-the-case-of-diphtheria-toxin-translocation-domain
#8
Alexander Kyrychenko, Nathan M Lim, Victor Vasquez-Montes, Mykola V Rodnin, J Alfredo Freites, Linh P Nguyen, Douglas J Tobias, David L Mobley, Alexey S Ladokhin
Dynamic disorder of the lipid bilayer presents a challenge for establishing structure-function relationships in membranous systems. The resulting structural heterogeneity is especially evident for peripheral and spontaneously inserting membrane proteins, which are not constrained by the well-defined transmembrane topology and exert their action in the context of intimate interaction with lipids. Here, we propose a concerted approach combining depth-dependent fluorescence quenching with Molecular Dynamics simulation to decipher dynamic interactions of membrane proteins with the lipid bilayers...
March 17, 2018: Journal of Membrane Biology
https://www.readbyqxmd.com/read/29547697/atomistic-mechanism-of-large-scale-conformational-transition-in-a-heterodimeric-abc-exporter
#9
Hendrik Göddeke, M Hadi Timachi, Cedric A Hutter, Laura Galazzo, Markus A Seeger, Mikko Karttunen, Enrica Bordignon, Lars V Schäfer
ATP-binding cassette (ABC) transporters are ATP-driven molecular machines, in which ATP binding and hydrolysis in the nucleotide-binding domains (NBDs) is chemo-mechanically coupled to large-scale, alternating access conformational changes in the transmembrane domains (TMDs), ultimately leading to the translocation of substrates across biological membranes. The precise nature of the structural dynamics behind the large-scale conformational transition as well as the coupling of NBD and TMD motions is still unresolved...
March 16, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29543435/a%C3%AE-42-protofibrils-interact-with-and-are-trafficked-through-microglial-derived-microvesicles
#10
Lisa K Gouwens, Mudar S Ismail, Victoria A Rogers, Nathan T Zeller, Evan C Garrad, Fatima S Amtashar, Nyasha J Makoni, David C Osborn, Michael R Nichols
Microvesicles (MVs) and exosomes comprise a class of cell-secreted particles termed extracellular vesicles (EVs). These cargo-holding vesicles mediate cell-to-cell communication and have recently been implicated in neurodegenerative diseases such as Alzheimer's disease (AD). The two types of EVs are distinguished by the mechanism of cell release and their size, with the smaller exosomes and the larger MVs ranging from 30 to 100 nm and 100 nm to 1 μm in diameter, respectively. MV numbers are increased in AD and appear to interact with amyloid-β peptide (Aβ), the primary protein component of the neuritic plaques in the AD brain...
March 15, 2018: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/29530601/structural-patterns-of-the-human-abcc4-mrp4-exporter-in-lipid-bilayers-rationalize-clinically-observed-polymorphisms
#11
B Chantemargue, F Di Meo, K Berka, N Picard, H Arnion, M Essig, P Marquet, M Otyepka, P Trouillas
The ABCC4/MRP4 exporter has a clinical impact on membrane transport of a broad range of xenobiotics. It is expressed at key locations for drug disposition or effects such as in the liver, the kidney and blood cells. Several polymorphisms and mutations (e.g., p.Gly187Trp) leading to MRP4 dysfunction are associated with an increased risk of toxicity of some drugs. So far, no human MRP4 structure has been elucidated, precluding rationalization of these dysfunctions at a molecular level. We constructed atomistic model of the wild type (WT) MRP4 and the p...
March 9, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29524794/design-synthesis-and-perception-of-fluorescently-labeled-isoprenoid-cytokinins
#12
Karolina Kubiasová, Václav Mik, Jaroslav Nisler, Martin Hönig, Alexandra Husičková, Lukáš Spíchal, Zuzana Pěkná, Olga Šamajová, Karel Doležal, Ondřej Plíhal, Eva Benková, Miroslav Strnad, Lucie Plíhalová
Isoprenoid cytokinins play a number of crucial roles in the regulation of plant growth and development. To study cytokinin receptor properties in plants, we designed and prepared fluorescent derivatives of 6-[(3-methylbut-2-en-1-yl)amino]purine (N6 -isopentenyladenine, iP) with several fluorescent labels attached to the C2 or N9 atom of the purine moiety via a 2- or 6-carbon linker. The fluorescent labels included dansyl (DS), fluorescein (FC), 7-nitrobenzofurazan (NBD), rhodamine B (RhoB), coumarin (Cou), 7-(diethylamino)coumarin (DEAC) and cyanine 5 dye (Cy5)...
March 7, 2018: Phytochemistry
https://www.readbyqxmd.com/read/29521495/interface-targeting-strategy-enables-two-photon-fluorescent-lipid-droplets-probes-for-high-fidelity-imaging-turbid-tissues-and-detecting-fatty-liver
#13
Lifang Guo, Minggang Tian, Ruiqing Feng, Ge Zhang, Ruoyao Zhang, Xuechen Li, Zhiqiang Liu, Xiuquan He, Jing Zhi Sun, Xiaoqiang Yu
Lipid droplets (LDs) with own interface architecture not only play crucial roles in protecting cell from lipotoxicity and lipoapoptosis but also closely relate with many diseases such as fatty liver and diabetes. Thus, as one of important applied biomaterials, fluorescent probes with ultrahigh selectivity for in-situ and high-fidelity imaging LDs in living cells and tissues are critical to elucidate relevant physiological and pathological events as well as detect related diseases. However, available LDs probes only utilizing their waterless neutral cores but ignoring the unique phospholipid monolayer interfaces exhibit low selectivity...
March 9, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29520883/the-nucleotide-bound-substrate-bound-conformation-of-the-mycoplasma-genitalium-dnak-chaperone
#14
Maria Adell, Bárbara M Calisto, Ignacio Fita, Luca Martinelli
Hsp70 chaperones keep protein homeostasis facilitating the response of organisms to changes in external and internal conditions. Hsp70s have two domains - Nucleotide Binding Domain (NBD) and Substrate Binding Domain (SBD) - connected by a conserved hydrophobic linker. Functioning of Hsp70s depend on tightly regulated cycles of ATP hydrolysis allosterically coupled, often together with co-chaperones, to the binding/release of peptide substrates. Here we describe the crystal structure of the Mycoplasma genitalium DnaK (MgDnaK) protein, an Hsp70 homolog, in the non-compact, nucleotide-bound/substrate-bound conformation...
March 9, 2018: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/29513298/nod2-activation-during-bacterial-and-viral-infections-polymorphisms-and-potential-as-therapeutic-target
#15
Diana Alhelí Domínguez-Martínez, Daniel Núñez-Avellaneda, Carlos Alberto Castañón-Sánchez, Ma Isabel Salazar
Nucleotide-binding domain (NBD) leucine-rich repeat (LRR)-containing receptors or NLRs are a family of receptors that detect both, molecules associated to pathogens and alarmins, and are located mainly in the cytoplasm. NOD2 belongs to the NLR family and is a dynamic receptor capable of interacting with multiple proteins and modulate immune responses in a stimuli-dependent manner. The experimental evidence shows that interaction between NOD2 structural domains and the effector proteins shape the overall response against bacterial or viral infections...
2018: Revista de Investigación Clínica; Organo del Hospital de Enfermedades de la Nutrición
https://www.readbyqxmd.com/read/29509417/versatile-coordination-modes-of-triphospha-1-4-pentadiene-2-4-diamine
#16
Anup K Adhikari, Toni Grell, Peter Lönnecke, Evamarie Hey-Hawkins
1,3,5-Triphospha-1,4-pentadiene-2,4-diamine reacts with [M(CO)4 L] (M = Mo, L = nbd (norbornadiene); M = W, L = 2 CH3 CN) to give the chelate complexes [M(CO)4 (PMes{C(NHCy)PMes}2 -κ P1 ,P3 )]. In contrast, an unusual intramolecular rearrangement occurred with [Cu(CH3 CN)4 ]PF6 leading to the dimeric copper(I) complex [Cu(CNCy){PHMesPMesC(NHCy)PMes-κ P1 ,P3 }]2 (PF6 )2 . The mechanism of the rearrangement was supported by quantum-mechanical calculations. The transition-metal complexes were characterized by multinuclear NMR spectroscopy, mass spectrometry, infrared spectroscopy, and X-ray crystallography...
March 6, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29496449/effect-of-tamoxifen-on-the-sphingolipid-biosynthetic-pathway-in-the-different-intraerythrocytic-stages-of-the-apicomplexa-plasmodium-falciparum
#17
Tamara A Piñero, Malena Landoni, Vilma G Duschak, Alejandro M Katzin, Alicia S Couto
Parasites of the genus Plasmodium responsible for Malaria are obligate intracellular pathogens residing in mammalian red blood cells, hepatocytes, or mosquito midgut epithelial cells. Regarding that detailed knowledge on the sphingolipid biosynthetic pathway of the apicomplexan protozoan parasites is scarce, different stages of Plasmodium falciparum were treated with tamoxifen in order to evaluate the effects of this drug on the glycosphingolipid biosynthesis. Thin layer chromatography, High performance reverse phase chromatography and UV-MALDI-TOF mass spectrometry were the tools used for the analysis...
February 26, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29495458/substrate-binding-switches-the-conformation-at-the-lynchpin-site-in-the-substrate-binding-domain-of-human-hsp70-to-enable-allosteric-interdomain-communication
#18
Kohei Umehara, Miho Hoshikawa, Naoya Tochio, Shin-Ichi Tate
The stress-induced 70 kDa heat shock protein (Hsp70) functions as a molecular chaperone to maintain protein homeostasis. Hsp70 contains an N-terminal ATPase domain (NBD) and a C-terminal substrate-binding domain (SBD). The SBD is divided into the β subdomain containing the substrate-binding site (βSBD) and the α-helical subdomain (αLid) that covers the βSBD. In this report, the solution structures of two different forms of the SBD from human Hsp70 were solved. One structure shows the αLid bound to the substrate-binding site intramolecularly, whereas this intramolecular binding mode is absent in the other structure solved...
February 27, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29463729/nlr-surveillance-of-essential-sec-9-snare-proteins-induces-programmed-cell-death-upon-allorecognition-in-filamentous-fungi
#19
Jens Heller, Corinne Clavé, Pierre Gladieux, Sven J Saupe, N Louise Glass
In plants and metazoans, intracellular receptors that belong to the NOD-like receptor (NLR) family are major contributors to innate immunity. Filamentous fungal genomes contain large repertoires of genes encoding for proteins with similar architecture to plant and animal NLRs with mostly unknown function. Here, we identify and molecularly characterize patatin-like phospholipase-1 (PLP-1), an NLR-like protein containing an N-terminal patatin-like phospholipase domain, a nucleotide-binding domain (NBD), and a C-terminal tetratricopeptide repeat (TPR) domain...
March 6, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29448172/analysis-of-quetiapine-in-human-plasma-using-fluorescence-spectroscopy
#20
Islam M Mostafa, Mahmoud A Omar, Dalia M Nagy, Sayed M Derayea
A simple and sensitive spectrofluorimetric method has been development for the assurance of quetiapine fumarate (QTF). The proposed method was utilized for measuring the fluorescence intensity of the yellow fluorescent product at 510nm (λ ex 470nm). The fluorescent product has resulted from the nucleophilic substitution reaction of QTF with 4-chloro-7-nitrobenzofurazane (NBD-Cl) in Mcllvaine buffer (pH7.0). The diverse variables influencing the development of the reaction product were deliberately changed and optimized...
February 6, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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