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https://www.readbyqxmd.com/read/28527111/human-placenta-derived-mesenchymal-stem-cells-loaded-on-linear-ordered-collagen-scaffold-improves-functional-recovery-after-completely-transected-spinal-cord-injury-in-canine
#1
Sufang Han, Zhifeng Xiao, Xing Li, Huan Zhao, Bin Wang, Zhixue Qiu, Zhi Li, Xin Mei, Bai Xu, Caixia Fan, Bing Chen, Jin Han, Yanzheng Gu, Huilin Yang, Qin Shi, Jianwu Dai
Traumatic spinal cord injury (SCI) is a major challenge in the clinic. In this study, we sought to examine the synergistic effects of linear ordered collagen scaffold (LOCS) and human placenta-derived mesenchymal stem cells (hPMSCs) when transplanted into completely transected beagle dogs. After 36 weeks observation, we found that LOCS+hPMSCs implants promoted better hindlimb locomotor recovery than was observed in the non-treatment (control) group and LOCS group. Histological analysis showed that the regenerated tissue after treatment was well integrated with the host tissue, and dramatically reduced the volume of cystic and chondroitin sulfate proteoglycans (CSPGs) expression...
May 16, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28524651/electrodeposited-mo3s13-films-from-nh4-2mo3s13%C3%A2-2h2o-for-electrocatalysis-of-hydrogen-evolution-reaction
#2
Kuangzhou Du, Lirong Zheng, Tanyuan Wang, Junqiao Zhuo, Zhiwei Zhu, Yuanhua Shao, Meixian Li
Molybdenum sulfides are considered to be one kind of the promising candidates as cheap and efficient electrocatalysts for hydrogen evolution reaction (HER). But this is still a gap on electrocatalytic performance toward Pt. In order to further enhance electrocatalytic activity of molybdenum sulfides, in this work, Mo3S13 films with high ratio of sulfur to molybdenum were prepared by electrodeposition. The Mo3S13 films exhibit highly efficient electrocatalytic activity for HER and achieve a current density of 10 mA/cm2 at an overpotential of 200 mV with an onset potential of 130 mV vs...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28521711/mini-heme-proteins-designability-of-structure-and-diversity-of-functions
#3
Jagdish Rai
Natural heme proteins may have heme bound to poly-peptide chain as a cofactor via non-covalent forces or heme as a prosthetic group may be covalently bound to the proteins. Nature has used porphyrins in diverse functions like electron transfer, oxidation, reduction, ligand binding, photosynthesis, signaling, etc. by modulating its properties through diverse protein matrices. Synthetic chemists have tried to utilize these molecules in equally diverse industrial and medical applications due to their versatile electro-chemical and optical properties...
May 15, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28520909/large-scale-data-driven-integrative-framework-for-extracting-essential-targets-and-processes-from-disease-associated-gene-data-sets
#4
Gaston K Mazandu, Emile R Chimusa, Kayleigh Rutherford, Elsa-Gayle Zekeng, Zoe Z Gebremariam, Maryam Y Onifade, Nicola J Mulder
Populations worldwide currently face several public health challenges, including growing prevalence of infections and the emergence of new pathogenic organisms. The cost and risk associated with drug development make the development of new drugs for several diseases, especially orphan or rare diseases, unappealing to the pharmaceutical industry. Proof of drug safety and efficacy is required before market approval, and rigorous testing makes the drug development process slow, expensive and frequently result in failure...
May 18, 2017: Briefings in Bioinformatics
https://www.readbyqxmd.com/read/28517106/tunable-supramolecular-assembly-and-photoswitchable-conversion-of-cyclodextrin-diphenylalanine-based-1d-and-2d-nanostructures
#5
He-Lue Sun, Yong Chen, Xu Han, Yu Liu
A photocontrolled, interconvertible supramolecular 2D-nanosheet/1D-nanotube system was constructed through the supramolecular assembly of adamantanyl-modified diphenylalanine with azobenzene-bridged bis(β-cyclodextrin). The nanosheet exhibited a greater fluorescence enhancement effect than the nanotube. Significantly, these nanosheets and nanotubes could interconvert via the photocontrolled trans/cis isomerization of azobenzene linkers in bis(β-cyclodextrin), and this photo-switchable one-dimensional/two-dimensional morphological interconversion was reversible and recyclable...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28514595/flocculation-and-dewatering-of-mature-fine-tailings-using-temperature-responsive-cationic-polymers
#6
Dan Zhang, Thomas Thundat, Ravin Narain
Temperature-responsive copolymer with cationic charge was prepared with N-isopropylacrylamide (NIPAM) and 2-aminoethyl methacrylamide hydrochloride (AEMA) by conventional free-radical polymerization. The flocculation performance of the copolymer, poly(AEMA-st-NIPAM), was compared to five different mixture ratios of polyNIPAM and cationic poly(acrylamide-st-diallyldimethylammonium chloride) (poly(AAm-st-DADMAC)). The effects of polymer mixture ratios, polymer dosages, and temperature on solid-liquid separation as a function of initial settling rates (ISR), supernatant turbidity, sediment solids content and water recovery were investigated...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28508509/investigating-the-inter-subunit-subdomain-interactions-and-motions-relevant-to-disease-mutations-in-the-n-terminal-domain-of-ryanodine-receptors-by-molecular-dynamics-simulation
#7
Wenjun Zheng, Zheng Liu
The ryanodine receptors (RyR) are essential to calcium signaling in striated muscles, and numerous disease mutations have been identified in two RyR isoforms, RyR1 in skeletal muscle and RyR2 in cardiac muscle. A deep understanding of the activation/regulation mechanisms of RyRs has been hampered by the shortage of high-resolution structures and dynamic information for this giant tetrameric complex in different functional states. Toward elucidating the molecular mechanisms of disease mutations in RyRs, we performed molecular dynamics simulation of the N-terminal domain (NTD) which is not only the best-resolved structural component of RyRs, but also a hotspot of disease mutations...
May 15, 2017: Proteins
https://www.readbyqxmd.com/read/28506910/omecamtiv-mecarbil-activates-ryanodine-receptors-from-canine-cardiac-but-not-skeletal-muscle
#8
Péter Nánási, Marta Gaburjakova, Jana Gaburjakova, János Almássy
Due to the limited results achieved in the clinical treatment of heart failure, a new inotropic strategy of myosin motor activation has been developed. The lead molecule of myosin activator agents is omecamtiv mecarbil, which binds directly to the heavy chain of the cardiac β-myosin and enhances cardiac contractility by lengthening the lifetime of the acto-myosin complex and increasing the number of the active force-generating cross-bridges. In the absence of relevant data, the effect of omecamtiv mecarbil on canine cardiac ryanodine receptors (RyR 2) has been investigated in the present study by measuring the electrical activity of single RyR 2 channels incorporated into planar lipid bilayer...
May 12, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28504559/immobilization-of-native-type-i-collagen-on-polypropylene-fabrics-as-a-substrate-for-hepg2-cell-culture
#9
Gongze Peng, Saina Li, Qing Peng, Yang Li, Jun Weng, Zhidong Jia, Jiyao Kang, Xiongxin Lei, Guifeng Zhang, Yi Gao
Background/aims The critical part of a bio-artificial liver device is establishment of a bioreactor filled with liver cells. However, it is still unclear how to maintain benign cell function while achieving the sufficient cell quantity. In the current study, we aim to establish a novel carrier for the culture of HepG2 cells, a liver cell line, by modifying polypropylene nonwoven fabrics with native type I collagen. Methods "Piranha" solution, KH-550 and glutaraldehyde subsequently were used to bridge native type I collagen and polypropylene nonwoven fabrics...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28498320/chronic-kidney-disease-and-exposure-to-nephrotoxic-metals
#10
REVIEW
Sarah E Orr, Christy C Bridges
Chronic kidney disease (CKD) is a common progressive disease that is typically characterized by the permanent loss of functional nephrons. As injured nephrons become sclerotic and die, the remaining healthy nephrons undergo numerous structural, molecular, and functional changes in an attempt to compensate for the loss of diseased nephrons. These compensatory changes enable the kidney to maintain fluid and solute homeostasis until approximately 75% of nephrons are lost. As CKD continues to progress, glomerular filtration rate decreases, and remaining nephrons are unable to effectively eliminate metabolic wastes and environmental toxicants from the body...
May 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28495859/alpha-synuclein-may-cross-bridge-v-snare-and-acidic-phospholipids-to-facilitate-snare-dependent-vesicle-docking
#11
Xiaochu Lou, Jaewook Kim, Brenden J Hawk, Yeon-Kyun Shin
Misfolded α-synuclein/A-syn is widely recognized as primal cause of neurodegenerative diseases including Parkinson's and dementia with Lewy bodies. The normal cellular function of A-syn has however been elusive. There is evidence that A-syn plays a variety of roles in the exocytotic pathway in the neuron, but the underlying molecular mechanisms are unclear. A-syn has been known to interact with negatively charged phospholipids and with vesicle SNARE protein VAMP2 as well. Using single vesicle-vesicle docking/fusion assays, we find that A-syn promotes SNARE-dependent vesicles docking significantly at 2...
May 11, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28494361/ferrocene-functionalized-graphitic-carbon-nitride-as-an-enhanced-heterogeneous-catalyst-of-fenton-reaction-for-degradation-of-rhodamine-b-under-visible-light-irradiation
#12
Kun-Yi Andrew Lin, Jyun-Ting Lin
To enhance degradation of Rhodamine B (RhB), a toxic xanthene dye, an iron-doped graphitic carbon nitride (CN) is prepared by establishing a covalent bond (-CN-) bridging ferrocene (Fc) and CN via a Schiff base reaction. The π-conjugation between the aromatic Fc and CN can be much enhanced by the covalent bond, thereby facilitating the bulk-to-surface charge transfer and separation as well as reversible photo-redox reactions during photocatalytic reactions. Thus, the resulting Fc-CN exhibits a much higher catalytic activity than CN to activate hydrogen peroxide (HP) for RhB degradation, because the photocatalytically generated electrons from CN can activate HP and effectively maintain the bivalence state of Fe in Fc, which also induces the activation of HP...
May 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28492928/local-changes-to-the-distal-femoral-growth-plate-following-injury-in-mice
#13
Lauren M Mangano Drenkard, Meghan E Kupratis, Katie Li, Louis C Gerstenfeld, Elise F Morgan
Injury to the growth plate is associated with growth disturbances, most notably premature cessation of growth. The goal of this study was to identify spatial changes in the structure and composition of the growth plate in response to injury to provide a foundation for developing therapies that minimize the consequences for skeletal development. We used contrast-enhanced micro-computed tomography (CECT) and histological analyses of a murine model of growth plate injury to quantify changes in the cartilaginous and osseous tissue of the growth plate...
May 8, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28489303/n2-to-nh3-conversion-by-a-triphos-iron-catalyst-and-enhanced-turnover-under-photolysis
#14
Trixia M Buscagan, Paul H Oyala, Jonas C Peters
Bridging iron hydrides are proposed to form at the active site of MoFe-nitrogenase during catalytic dinitrogen reduction to ammonia and may be key in the binding and activation of N2 via reductive elimination of H2 . This possibility inspires the investigation of well-defined molecular iron hydrides as precursors for catalytic N2 -to-NH3 conversion. Herein, we describe the synthesis and characterization of new P2(P'Ph) Fe(N2 )(H)x systems that are active for catalytic N2 -to-NH3 conversion. Most interestingly, we show that the yields of ammonia can be significantly increased if the catalysis is performed in the presence of mercury lamp irradiation...
May 10, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28487131/dendritic-cells-in-the-host-response-to-implanted-materials
#15
REVIEW
Benjamin G Keselowsky, Jamal S Lewis
The role of dendritic cells (DCs) and their targeted manipulation in the body's response to implanted materials is an important and developing area of investigation, and a large component of the emerging field of biomaterials-based immune engineering. The key position of DCs in the immune system, serving to bridge innate and adaptive immunity, is facilitated by rich diversity in type and function and places DCs as a critical mediator to biomaterials of both synthetic and natural origins. This review presents current views regarding DC biology and summarizes recent findings in DC responses to implanted biomaterials...
May 6, 2017: Seminars in Immunology
https://www.readbyqxmd.com/read/28485968/chiral-template-directed-regio-diastereo-and-enantioselective-photodimerization-of-an-anthracene-derivative-assisted-by-complementary-amidinium-carboxylate-salt-bridge-formation
#16
Junki Tanabe, Daisuke Taura, Naoki Ousaka, Eiji Yashima
A series of optically active amidine dimers composed of m-terphenyl backbones joined by a variety of linkers, such as achiral and chiral p-phenylene and chiral amide linkers, were synthesized and used as templates for the regio- (head-to-tail (HT) or head-to-head (HH)), diastereo- (anti or syn), and enantioselective [4 + 4] photocyclodimerization of an achiral m-terphenyl-based carboxylic acid monomer bearing a prochiral 2-substituted anthracene at one end (1) through complementary amidinium-carboxylate salt bridges...
May 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28483453/bivalent-o-glycoside-mimetics-with-s-disulfide-se-substitutions-and-aromatic-core-synthesis-molecular-modeling-and-inhibitory-activity-on-biomedically-relevant-lectins-in-assays-of-increasing-physiological-relevance
#17
Herbert Kaltner, Tamás Szabó, Krisztina Fehér, Sabine André, Sára Balla, Joachim C Manning, László Szilágyi, Hans-Joachim Gabius
The emerging significance of recognition of cellular glycans by lectins for diverse aspects of pathophysiology is a strong incentive for considering development of bioactive and non-hydrolyzable glycoside derivatives, for example by introducing S/Se atoms and the disulfide group instead of oxygen into the glycosidic linkage. We report the synthesis of 12 bivalent thio-, disulfido- and selenoglycosides attached to benzene/naphthalene cores. They present galactose, for blocking a plant toxin, or lactose, the canonical ligand of adhesion/growth-regulatory galectins...
April 9, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28482607/photosensitive-multifunctional-poly-vinyl-alcohol-micelles-for-enhanced-antitumor-effect
#18
Qingbo Yu, Anjian Xie, Fangzhi Huang, Shikuo Li, Yazhong Xiao, Yuhua Shen
Polyvinyl alcohol (PVA) micelles were firstly synthesized by using hemin molecules as novel crosslinked bridges (PVA-H crosslinked micelles). On one hand, the crosslinked micelles can allow high stability against extensive dilution (1800-fold) to reduce side-effects; On the other hand, the bridges not only can destruct by means of laser irradiation (405nm, 200mw), but also can induce the production of singlet oxygen ((1)O2) and the release of 5-fluorouracil (5FU) (i.e. 46% release in 360min). But above all, that 5FU-loaded PVA-H crosslinked micelles irradiating by laser is more efficient than PVA-H crosslinked micelles and free 5FU in killing tumor cells, suggest the effective synergistic antitumor effect about chemotherapy and photodynamic therapy (PDT)...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28482594/a-bridging-sf-alg-composite-scaffold-loaded-ngf-for-spinal-cord-injury-repair
#19
Genlong Jiao, Yongqin Pan, Cunchuang Wang, ZhaoXia Li, Zhizhong Li, Rui Guo
Neurons loss and axons degeneration after spinal cord injury (SCI) gradually give rise to result in functional motor and sensory impairment. A bridging biomaterial scaffold that allows the axons to grow through has been investigated for the repair of injured spinal cord. In this study, we introduced a silk fibroin (SF)-based neurobridge as scaffold enriched with/without nerve growth factor (NGF) that can be utilized as a therapeutic approach for spinal cord repair. NGF released from alginate (Alg) microspheres on SF scaffold (SF/Alg composites scaffolds) to the central lesion site of SCI significantly enhanced the sparing of spinal cord tissue and increased the number of surviving neurons...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28476596/synergistic-effect-of-glycerol-and-ionic-strength-on-the-rheological-behavior-of-cellulose-nanocrystals-suspension-system
#20
Yang Qin, Ranran Chang, Shengju Ge, Liu Xiong, Qingjie Sun
To broaden the application of cellulose nanocrystals (CNCs) in the field of biopolymer nanocomposites, a systematic assessment of the viscoelastic properties of CNC suspensions in the presence of glycerol (Gly) and/or sodium chloride (NaCl) was conducted. The viscosity, storage modulus (G'), and loss modulus (G'') increased with increasing concentrations of CNCs and Gly, respectively. Dramatically, the G' and G'' values were raised and tanδ (<1) decreased with the increasing addition of NaCl, indicating that the elastic properties of CNCs in NaCl solutions continuously strengthened, thereby the gel-like response of the network was enhanced...
May 3, 2017: International Journal of Biological Macromolecules
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