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https://www.readbyqxmd.com/read/28535036/reversible-bond-cation-coupled-electron-transfer-on-phenylenediamine-based-rhodamine-b-and-its-application-on-electrochromism
#1
Xiaojun Wang, Shuo Wang, Chang Gu, Weiran Zhang, Hongzhi Zheng, Jingjing Zhang, Geyu Lu, Yu-Mo Zhang, Minjie Li, Sean Xiao-An Zhang
A bio-mimetic system on reversible bond coupled electron transfer (BCET) has been proposed and investigated in a switchable Rh-N molecule with redox active subunits. We discover that energy barrier of C-N bond breaking is reduced dramatically to less than 1/7 (from 40.4 kcal/mol to 5.5 kcal/mol), and 1/3 of the oxidation potential has been simultaneously lowered (from 0.67 V to 0.43 V) with the oxidation of Rh-N. The concept, cation coupled electron transfer (CCET), is highly recommended by analyzing existing proton coupled electron transfer (PCET) and metal coupled electron transfer (MCET) along with aforementioned BCET, which have same characteristic of transferring positive charges, such as proton, metal ion, and organic cation...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28535031/tunichrome-inspired-gold-enrichment-dispersion-matrix-and-its-application-in-water-treatment-a-proof-of-concept-investigation
#2
Amarendra Dhar Dwivedi, Rega Permana, Jitendra Pal Singh, Hakwon Yoon, Keun Hwa Chae, Yoon-Seok Chang, Dong Soo Hwang
Tunicate, a filter-feeder in seawater, is able to accumulate high amount of metals using intracellular polymer matrices. The woven pyrogallol structures of tunichrome, a small peptide contained in tunicate's blood cells, is believed to be responsible for selective metal sequestration in tunicates from seawater. However, the intriguing tunichrome matrix is difficult to harvest from the tunicate nor to synthesize massively due to the extreme oxidation sensitivity of the pyrogallol moiety which limits the study scope...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534562/k-junction-structure-mediated-exponential-signal-amplification-strategy-for-microrna-detection-in-electrochemiluminescence-biosensor
#3
Xue Li, Anyi Chen, Yaqin Chai, Ruo Yuan
Based on the novel designed K-junction structure, an economic and efficient exponential signal amplification strategy with simple protocol combining hemin/G-quadruplex, a mimetic peroxidase, as a catalyzer was proposed and utilized in an electrochemiluminescence biosensor for sensitive microRNA detection. It was noteworthy that the K-junction structure was formed with guanine-rich reporter DNA and substrate DNA modified by phosphate at the 5'-terminus. Thus, the activity of the reporter DNA could be inhibited and the recognition domain for the target microRNA constructed through the K-junction structure formed...
May 23, 2017: Analyst
https://www.readbyqxmd.com/read/28533261/the-superoxide-dismutase-mimetic-tempol-does-not-alleviate-glucocorticoid-mediated-rarefaction-of-rat-skeletal-muscle-capillaries
#4
Erin R Mandel, Emily C Dunford, Ghoncheh Abdifarkosh, Patrick C Turnbull, Christopher G R Perry, Michael C Riddell, Tara L Haas
Sustained elevations in circulating glucocorticoids elicit reductions in skeletal muscle microvascular content, but little is known of the underlying mechanisms. We hypothesized that glucocorticoid-induced oxidative stress contributes to this phenomenon. In rats that were implanted with corticosterone (CORT) or control pellets, CORT caused a significant decrease in muscle glutathione levels and a corresponding increase in protein carbonylation, an irreversible oxidative modification of proteins. Decreased endothelial nitric oxide synthase and increased endothelin-1 mRNA levels were detected after 9 days of CORT, and blood flow to glycolytic muscles was diminished...
May 2017: Physiological Reports
https://www.readbyqxmd.com/read/28532670/syntheses-of-prodrug-type-phosphotriester-oligonucleotides-responsive-to-intracellular-reducing-environment-for-improvement-of-cell-membrane-permeability-and-nuclease-resistance
#5
Junsuke Hayashi, Yusuke Samezawa, Yosuke Ochi, Shun-Ichi Wada, Hidehito Urata
We synthesized prodrug-type phosphotriester (PTE) oligonucleotides containing the six-membered cyclic disulfide moiety by using phosphoramidite chemistry. Prodrug-type oligonucleotides named "Reducing-Environment-Dependent Uncatalyzed Chemical Transforming (REDUCT) PTE oligonucleotides" were converted into natural oligonucleotides under cytosol-mimetic reductive condition. Furthermore, the REDUCT PTE oligonucleotides were robust to nuclease digestion and exhibited good cell membrane permeability.
May 11, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28530799/bioinspired-interface-engineering-for-moisture-resistance-in-nacre-mimetic-cellulose-nanofibrils-clay-nanocomposites
#6
Kun Yao, Shu Huang, Hu Tang, Yeping Xu, Gerd Buntkowsky, Lars A Berglund, Qi Zhou
The interfacial adhesion design between "mortar" and "bricks" is essential for mechanical and barrier performance of nanocellulose-based nacre-mimetic nanocomposites, especially at high moisture conditions. To address this fundamental challenge, dopamine (DA) has been conjugated to cellulose nanofibrils (CNFs) and subsequently assembled with montmorillonite (MTM) to generate layered nanocomposite films inspired by the strong adhesion of mussel adhesive proteins to inorganic surfaces under water. The selective formation of catechol/metal ion chelation and hydrogen bonding at the interface between MTM platelets and CNFs bearing DA renders transparent films with strong mechanical properties, particularly at high humidity and in wet state...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28529037/diabetes-development-increased-concentrations-of-the-conjugated-bile-acid-taurocholic-acid-in-serum-while-treatment-with-microencapsulated-taurocholic-acid-exerted-no-hypoglycaemic-effects
#7
Sangeetha Mathavan, Momir Mikov, Svetlana Golocorbin-Kon, Hani Al-Salami
CONTEXT: The bile acid taurocholic acid (TCA) is endogenously produced, and has shown formulation-stabilising effects when incorporated into microcapsules containing potential antidiabetic drugs. This study aimed to develop and characterise TCA-microcapsules, and test their antidiabetic effects, in an animal model of Type 1 diabetes (T1D). METHODS: Using the polymer sodium alginate (SA), SA-microcapsules (control) and TCA-microcapsules (test) were prepared, and assessed for morphology, surface composition, chemical and thermal stability, swelling, buoyancy, mechanical, release and rheological properties...
May 18, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28528775/structural-basis-for-apelin-control-of-the-human-apelin-receptor
#8
Yingli Ma, Yang Yue, Yanbin Ma, Qing Zhang, Qingtong Zhou, Yunpeng Song, Yuqing Shen, Xun Li, Xiaochuan Ma, Chao Li, Michael A Hanson, Gye Won Han, E Allen Sickmier, Gayathri Swaminath, Suwen Zhao, Raymond C Stevens, Liaoyuan A Hu, Wenge Zhong, Mingqiang Zhang, Fei Xu
Apelin receptor (APJR) is a key regulator of human cardiovascular function and is activated by two different endogenous peptide ligands, apelin and Elabela, each with different isoforms diversified by length and amino acid sequence. Here we report the 2.6-Å resolution crystal structure of human APJR in complex with a designed 17-amino-acid apelin mimetic peptide agonist. The structure reveals that the peptide agonist adopts a lactam constrained curved two-site ligand binding mode. Combined with mutation analysis and molecular dynamics simulations with apelin-13 binding to the wild-type APJR, this structure provides a mechanistic understanding of apelin recognition and binding specificity...
May 11, 2017: Structure
https://www.readbyqxmd.com/read/28528117/composite-elastomeric-polyurethane-scaffolds-incorporating-small-intestinal-submucosa-for-soft-tissue-engineering
#9
Lincui Da, Mei Gong, Anjing Chen, Yi Zhang, Yizhou Huang, Zhijun Guo, Shengfu Li, Jesse Li-Ling, Li Zhang, Huiqi Xie
Although soft tissue replacement has been clinically successful in many cases, the corresponding procedure has many limitations including the lack of resilience and mechanical integrity, significant donor-site morbidity, volume loss with time, and fibrous capsular contracture. These disadvantages can be alleviated by utilizing bio-absorbable scaffolds with high resilience and large strain, which are capable of stimulating natural tissue regeneration. Hence, the chemically crosslinked tridimensional scaffolds obtained by incorporating water-based polyurethane (PU) (which was synthesized from polytetramethylene ether glycol, isophorone diisocyanate, and 2,2-bis(hydroxymethyl) butyric acid) into a bioactive extracellular matrix consisting of small intestinal submucosa (SIS) have been tested in this study to develop a new approach for soft tissue engineering...
May 17, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28527176/gila-monster-lizard-incretin-mimetics
#10
Jayant Pai Dhungat
No abstract text is available yet for this article.
April 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28525842/indole-coumarin-thiadiazole-hybrids-an-appraisal-of-their-mcf-7%C3%A2-cell-growth-inhibition-apoptotic-antimetastatic-and-computational-bcl-2-binding-potential
#11
Pooja R Kamath, Dhanya Sunil, Manu M Joseph, Abdul Ajees Abdul Salam, Sreelekha T T
Cancer therapeutic potential of thiadiazole hybrids incorporating pharmacologically active indole and coumarin moieties have not been explored much. In the current investigation, three new thiadiazole hybrids with spacers of varying lengths linking indole and thiadiazole units were synthesized and their structures were well-established using various spectroscopic techniques. 3-(1-(5-(3-(1H-indol-3-yl)propyl)-1,3,4-thiadiazol-2-ylimino)ethyl)-6-bromo-2H-chromen-2-one (IPTBC) exhibited dose-dependent cytotoxicity in breast adenocarcinoma (MCF-7) cells...
May 11, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28524209/understanding-the-biomimetic-properties-of-gallium-in-pseudomonas-aeruginosa-an-xas-and-xps-study
#12
F Porcaro, C Bonchi, A Ugolini, E Frangipani, G Polzonetti, P Visca, C Meneghini, C Battocchio
Pyochelin (PCH) is a siderophore (extracellular chelator) produced by the pathogenic bacterium Pseudomonas aeruginosa (PAO). PCH is implicated in iron (Fe(3+)) transport to PAO, and is crucial for its metabolism and pathogenicity. Due to the chemical similarity with Fe(3+), gallium (Ga(3+)) interferes with vital iron-dependent processes in bacterial cells, thereby opening new perspectives for the design of specific metal-based antibacterial drugs. However, the structural basis for the Fe(3+)-mimetic properties of Ga(3+) complexed with the PCH siderophore is still lacking...
May 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28523567/peripheral-viral-challenge-triggers-hippocampal-production-of-inflammatory-proteins
#13
Tiffany Petrisko, Gregory Konat
Peripheral viral infections increase seizure propensity and intensity in susceptible individuals. We have modeled this comorbidity by demonstrating that intraperitoneal (ip) injection of the conventional viral mimetic, polyinosinic-polycytidylic acid (PIC), renders the brain hypersusceptible to seizures induced by kainic acid (KA). At the molecular level, the hippocampus, which is the ictal site of KA-induced seizures, exhibits upregulated expression of messages encoding several inflammatory genes. Here, we profiled temporal expression of these genes at the protein level...
May 18, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28522750/inhibition-of-mitochondrial-matrix-chaperones-and-anti-apoptotic-bcl-2-family-proteins-empower-antitumor-therapeutic-responses
#14
Georg Karpel-Massler, Chiaki Tsuge Ishida, Elena Bianchetti, Chang Shu, Rolando Perez-Lorenzo, Basil Horst, Matei Banu, Kevin A Roth, Jeffrey N Bruce, Peter Canoll, Dario C Altieri, Markus D Siegelin
Rational therapeutic approaches based on synthetic lethality may improve cancer management. Based on a high-throughput drug screen, we provide preclinical proof of concept that targeting the mitochondrial Hsp90 chaperone network (mtHsp90) and inhibition of Bcl-2, Bcl-xL and Mcl-1 is sufficient to elicit synthetic lethality in tumors recalcitrant to therapy. Our analyses focused on BH3 mimetics that are broad acting (ABT263 and Obatoclax) or selective (ABT199, WEHI-539 and A1210477), along with the established mitochondrial matrix chaperone inhibitor Gamitrinib-TPP...
May 18, 2017: Cancer Research
https://www.readbyqxmd.com/read/28522696/apolipoprotein-a-i-mimetic-peptides-discordance-between-in-vitro-and-in-vivo-properties
#15
Michael Ditiatkovski, Jonatan Palsson, Jaye Chin-Dusting, Alan T Remaley, Dmitri Sviridov
OBJECTIVE: Apolipoprotein A-I (apoA-I) mimetic peptides have antiatherogenic properties of high-density lipoprotein in vitro and have been shown to inhibit atherosclerosis in vivo. It is unclear, however, if each in vitro antiatherogenic property of these peptides translates to a corresponding activity in vivo, and if so, which of these contributes most to reduce atherosclerosis. APPROACH AND RESULTS: The effect of 7 apoA-I mimetic peptides, which were developed to selectively reproduce a specific component of the antiatherogenic properties of apoA-I, on the development of atherosclerosis was investigated in apolipoprotein E-deficient mice fed a high-fat diet for 4 or 12 weeks...
May 18, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28517004/exploitation-of-new-structurally-diverse-d-glucuronamide-containing-n-glycosyl-compounds-synthesis-and-anticancer-potential
#16
Nuno M Xavier, Alexandre Porcheron, Daniela Batista, Radek Jorda, Eva Řezníčková, Vladimír Kryštof, M Conceição Oliveira
The synthesis and anticancer evaluation of novel N-glycosyl derivatives containing N-substituted glucuronamide moieties, as nucleoside analogs or as prospective mimetics of glycosyl phosphates or of nucleotides, is reported. These compounds comprise N-anomerically-linked nucleobases or motifs that are surrogates of a phosphate group, such as sulfonamide or phosphoramidate moieties. 1-Sulfonamido glucuronamides containing N-benzyl, N-propargyl or N-dodecyl carboxamide units were synthesized through glycosylation of methanesulfonamide with tetra-O-acetyl glucuronamides...
May 18, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28516466/bioinspired-synthesis-of-cu2-modified-covalent-triazine-framework-a-new-highly-efficient-and-promising-peroxidase-mimic
#17
Fanggui Ye, Yuhao Xiong, Yuemei Qin, Linjing Su
Artificial enzyme mimetics is an emerging field of research owing to the remarkable advantages of enzyme mimics over native enzymes, including tunable catalytic efficiencies, lower cost, ease of preparation, and excellent tolerance to reaction systems. Herein, we report an efficient peroxidase mimic based on a copper-modified covalent triazine framework (CCTF). Owing to its unique specific surface area, atomically dispersed active Cu sites, efficient electron transfer, and enhanced photo-assisted peroxidase-like activity, the CCTF showed superior peroxidase-like enzyme activity...
May 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28515202/does-coevolution-with-a-shared-parasite-drive-hosts-to-partition-their-defences-among-species
#18
Eleanor M Caves, Martin Stevens, Claire N Spottiswoode
When mimicry imposes costs on models, selection may drive the model's phenotype to evolve away from its mimic. For example, brood parasitism often drives hosts to diversify in egg appearance among females within a species, making mimetic parasitic eggs easier to detect. However, when a single parasite species exploits multiple host species, parasitism could also drive host egg evolution away from other co-occurring hosts, to escape susceptibility to their respective mimics. This hypothesis predicts that sympatric hosts of the same parasite should partition egg phenotypic space (defined by egg colour, luminance and pattern) among species to avoid one another...
May 17, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28514891/synergistic-effect-of-rapamycin-and-metformin-against-age-dependent-oxidative-stress-in-rat-erythrocyte
#19
Abhishek Kumar Singh, Geetika Garg, Sandeep Singh, Syed Ibrahim Rizvi
Erythrocytes are particularly vulnerable towards age-dependent oxidative stress mediated damage. Caloric restriction mimetics (CRMs) may provide a novel strategy for the maintenance of redox balance as well as effective treatment of age associated diseases. Herein, we have investigated the beneficial effect of co-treatment of CRM-candidate drugs, rapamycin (an immunosuppressant drug and inhibitor of mammalian target of rapamycin) and metformin (an anti-diabetic biguanide and activator of adenosine monophosphate kinase) against aging-induced oxidative stress in erythrocytes and plasma of aging rats...
May 17, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/28514687/particulate-array-of-well-ordered-hiv-clade-c-env-trimers-elicits-neutralizing-antibodies-that-display-a-unique-v2-cap-approach
#20
Paola Martinez-Murillo, Karen Tran, Javier Guenaga, Gustaf Lindgren, Monika Àdori, Yu Feng, Ganesh E Phad, Néstor Vázquez Bernat, Shridhar Bale, Jidnyasa Ingale, Viktoriya Dubrovskaya, Sijy O'Dell, Lotta Pramanik, Mats Spångberg, Martin Corcoran, Karin Loré, John R Mascola, Richard T Wyatt, Gunilla B Karlsson Hedestam
The development of soluble envelope glycoprotein (Env) mimetics displaying ordered trimeric symmetry has ushered in a new era in HIV-1 vaccination. The recently reported native, flexibly linked (NFL) design allows the generation of native-like trimers from clinical isolates at high yields and homogeneity. As the majority of infections world-wide are of the clade C subtype, we examined responses in non-human primates to well-ordered subtype C 16055 trimers administered in soluble or high-density liposomal formats...
May 16, 2017: Immunity
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