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https://www.readbyqxmd.com/read/28743125/surfactant-protein-b-suppresses-lung-cancer-progression-by-inhibiting-secretory-phospholipase-a2-activity-and-arachidonic-acid-production
#1
Sungmin Lee, Daehoon Kim, JiHoon Kang, EunGi Kim, Wanyeon Kim, HyeSook Youn, BuHyun Youn
BACKGROUND/AIMS: Radiotherapy is applied to patients with inoperable cancer types including advanced stage non-small cell lung cancer (NSCLC) and radioresistance functions as a critical obstacle in radiotherapy. This study was aimed to investigate the mechanism of radioresistance regulated by surfactant protein B (SP-B). METHODS: To investigate the role of SP-B in radioresistance, ΔSFTPB A549 cell line was established and SP-B expression was analyzed. In response to ionizing radiation (IR), the change of SP-B expression was analyzed in A549 and NCI-H441 cell lines...
July 25, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28742972/stimuli-responsive-directional-vesicular-assembly-with-tunable-surface-functionality-and-impact-on-enzyme-inhibition
#2
Amrita Sikder, Debes Ray, Vinod Kumar Aswal, Suhrit Ghosh
The article describes self-assembly of a series of unsymmetrical bola-shape π-amphiphiles (NDI-1, NDI-1a, NDI-2, NDI-3 and NDI-4) consisting of a hydrophobic naphthalene-diimide (NDI) chromophore attached with a non-ionic hydrophilic wedge and an anionic head group in the two opposite arms of the central NDI. By design only a single hydrazide group is linked either on the ionic or non-ionic arm of the NDI. NDI-1 and NDI-1a are regioisomers differing only in the location of the hydrazide group, placed in the non-ionic or ionic arm, respectively...
July 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28742723/supraglottic-atomization-of-surfactant-in-spontaneously-breathing-lambs-receiving-continuous-positive-airway-pressure
#3
Ilaria Milesi, David G Tingay, Anna Lavizzari, Federico Bianco, Emanuela Zannin, Paolo Tagliabue, Fabio Mosca, Maria Luisa Ventura, Anushi Rajapaksa, Elizabeth J Perkins, Don Black, Marco Di Castri, Magdy Sourial, Gerhard Pohlmann, Raffaele L Dellaca'
OBJECTIVES: To determine the short-term tolerance, efficacy, and lung deposition of supraglottic atomized surfactant in spontaneously breathing lambs receiving continuous positive airway pressure. DESIGN: Prospective, randomized animal study. SETTING: Animal research laboratory. SUBJECTS: Twenty-two preterm lambs on continuous positive airway pressure (132 ± 1 d gestational age). INTERVENTIONS: Animals receiving continuous positive airway pressure via binasal prongs at 8 cm H2O were randomized to receive atomized surfactant at approximately 60-minute of life (atom; n = 15) or not (control; n = 7)...
July 22, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28741953/synthesis-of-functional-particles-by-condensation-and-polymerization-of-monomer-droplets-in-silicone-oils
#4
Prathamesh Karandikar, Malancha Gupta
We studied the synthesis of poly(4-vinylpyridine) and poly(2-hydroxyethyl methacrylate) polymer particles in silicone oil using a sequential vapor phase polymerization method in which monomer droplets were first condensed onto a layer of silicone oil and subsequently polymerized via a free radical mechanism. The viscosity of the silicone oil was systematically varied. At lower viscosities, a heterogeneous particle size distribution was produced where small particles were formed by engulfment of the monomer droplets at the liquid surface and large particles were formed by coalescence of the monomer droplets inside the liquid layer...
July 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28741312/prediction-of-epr-spectra-of-lyotropic-liquid-crystals-using-a-combination-of-molecular-dynamics-simulations-and-the-model-free-approach
#5
Vasily S Oganesyan, Christopher Prior
We report the first application of fully atomistic molecular dynamics (MD) simulations to the prediction of the motional EPR spectra of lyotropic liquid crystals in different aggregation states. The purpose of this study is twofold. First, given that EPR spectra are highly sensitive to the motions and order of the spin probes doped within lyotropic aggregates, simulation of EPR line shapes from the results of MD modelling provides an ultimate test bed for the force fields currently employed to model such systems...
July 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28740987/rational-synthesis-of-hierarchical-magnetic-mesoporous-silica-microspheres-with-tunable-mesochannels-for-enhanced-enzyme-immobilization
#6
Dapeng Li, Renxing Yi, Jiangwei Tian, Jinhua Li, Boyang Yu, Jin Qi
Hierarchical magnetic mesoporous silica microspheres (MMSMs) with a core-shell structure have been fabricated through an improved water/oil biphase synthesis strategy. We firstly reported that the mesopore size can be readily tuned from 6.1 to 11.4 nm by the synergistic effect of surfactant concentration and an amphiphilic agent, thus holding a bright future in many possible applications.
July 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28740686/whole-lung-lavage-technical-details-challenges-and-management-of-complications
#7
REVIEW
Ahmed Awab, Muhammad S Khan, Houssein A Youness
Pulmonary alveolar proteinosis (PAP) is a rare disease characterized by alveolar accumulation of surfactant material with resulting hypoxemia and reduced lung function. Whole lung lavage (WLL) to physically remove the proteinaceous material from the affected lung is the standard treatment. Since its original description in 1964, there have been increasing numbers of WLL procedures done worldwide and the technique has been variously refined and modified. When done in experienced centers, WLL provides long lasting benefit in the majority of patients...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28738720/association-of-sp-b-gene-9306-a-g-polymorphism-rs7316-and-risk-of-rds
#8
Neda Fatahi, Nikoo Niknafs, Majid Kalani, Hosein Dalili, Mamak Shariat, Elaheh Amini, Tahereh Esmaeilnia Shirvani, Amir Kamal Hardani, Roya Taheritafti, Nasrin Ghasemi-Fakhr, Mohsen Ghadami, Javad Tavakkoly-Bazzaz, Ramin Rashidi-Nezhad, Fatemeh Nayeri, Ali Rashidi-Nezhad
BACKGROUND: Respiratory distress syndrome (RDS) is a severe pulmonary disease predominantly affects preterm newborns. Polymorphisms of surfactant-protein genes have been mostly evaluated as the candidate contributors in genetics of RDS. However the results are divers in different studies. We aimed at investigating the association of surfactant protein B (SPB) gene 9306 A/G polymorphism (rs7316) with RDS development. METHOD: Three hundred eighty newborns with gestational age of less than 34 weeks were included in a multicenter case-control study...
July 24, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28738282/fouling-behavior-of-silica-nanoparticle-surfactant-mixtures-during-constant-flux-dead-end-ultrafiltration
#9
Krzysztof W Trzaskus, Sooi Li Lee, Wiebe M de Vos, Antoine Kemperman, Kitty Nijmeijer
The increasing use of engineered nanoparticles in customer products results in their accumulation in water sources. In this experimental study, we investigated the role of surfactant type (cationic, anionic and non-ionic) and concentration on fouling development, nanoparticle rejection and fouling irreversibility during dead-end ultrafiltration of model silica nanoparticles. Our work demonstrates that the type of surfactant influences the nanoparticle stability, which in turn is responsible for differences in fouling behavior of the nanoparticles...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738158/efficient-interfacially-driven-vehiculization-of-corticosteroids-by-pulmonary-surfactant
#10
Alberto Hidalgo, Fabrizio Salomone, Nieves Fresno, Guillermo Orellana, Antonio Cruz, Jesus Perez-Gil
Pulmonary surfactant is a crucial system to stabilize the respiratory air-liquid interface. Furthermore, pulmonary surfactant has been proposed as an effective method for targeting drugs to the lungs. However, few studies have examined in detail the mechanisms of incorporation of drugs into surfactant, the impact of the presence of drugs on pulmonary surfactant performance at the interface under physiologically-meaningful conditions, or the ability of pulmonary surfactant to use the air-liquid interface to vehiculise drugs to long distances...
July 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28738151/effect-of-headgroup-variation-on-the-self-assembly-of-cationic-surfactants-with-sulfonatocalix-6-arene
#11
Véronique Wintgens, József Gábor Harangozó, Zsombor Miskolczy, Jean-Michel Guigner, Catherine Amiel, Laszlo Biczok
The effect of headgroup variation on the association of supramolecular amphiphiles composed of 4-sulfonatocalix[6]arene (SCX6) and cationic surfactant possessing tetradecyl substituent was studied in aqueous solutions at pH 7. When the surfactant contained hydrophilic trimethylammonium, pyridinium, or 1-methylimidazolium headgroup, highly reversible temperature-responsive nanoparticle-supramolecular micelle transformation could be attained at appropriately chosen component mixing ratios and NaCl concentrations...
July 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28737786/fluorescence-emission-originated-from-the-h-aggregated-cyanine-dye-with-chiral-gemini-surfactant-assemblies-having-a-narrow-absorption-band-and-a-remarkably-large-stokes-shift
#12
Naoya Ryu, Yutaka Okazaki, Emilie Pouget, Makoto Takafuji, Shoji Nagaoka, Hirotaka Ihara, Reiko Oda
We demonstrate that the fluorescence emission that originated from a cyanine dye forming H-aggregates with a narrow absorption band and a remarkably large Stokes shift can be induced by symmetry breaking. The H-aggregate formation was successfully induced using chirally assembled cationic gemini surfactants with enantiomeric tartrate counterions as templates in water.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737769/local-lung-hypoxia-determines-epithelial-fate-decisions-during-alveolar-regeneration
#13
Ying Xi, Thomas Kim, Alexis N Brumwell, Ian H Driver, Ying Wei, Victor Tan, Julia R Jackson, Jianming Xu, Dong-Kee Lee, Jeffrey E Gotts, Michael A Matthay, John M Shannon, Harold A Chapman, Andrew E Vaughan
After influenza infection, lineage-negative epithelial progenitors (LNEPs) exhibit a binary response to reconstitute epithelial barriers: activating a Notch-dependent ΔNp63/cytokeratin 5 (Krt5) remodelling program or differentiating into alveolar type II cells (AEC2s). Here we show that local lung hypoxia, through hypoxia-inducible factor (HIF1α), drives Notch signalling and Krt5(pos) basal-like cell expansion. Single-cell transcriptional profiling of human AEC2s from fibrotic lungs revealed a hypoxic subpopulation with activated Notch, suppressed surfactant protein C (SPC), and transdifferentiation toward a Krt5(pos) basal-like state...
July 24, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28736463/viscosity-density-and-thermal-conductivity-of-aluminum-oxide-and-zinc-oxide-nanolubricants
#14
M A Kedzierski, R Brignoli, K T Quine, J S Brown
This paper presents liquid kinematic viscosity, density, and thermal conductivity measurements of eleven different synthetic polyolester-based nanoparticle nanolubricants (dispersions) at atmospheric pressure over the temperature range 288 K to 318 K. Aluminum oxide (Al2O3) and zinc oxide (ZnO) nanoparticles with nominal diameters of 127 nm and 135 nm, respectively, were investigated. A good dispersion of the spherical and non-spherical nanoparticles in the lubricant was maintained with a surfactant. Viscosity, density, and thermal conductivity measurements were made for the neat lubricant along with eleven nanolubricants with differing nanoparticle and surfactant mass fractions...
February 2017: Revue Internationale du Froid
https://www.readbyqxmd.com/read/28735541/photoresponsive-foams-generated-by-a-rigid-surfactant-derived-from-dehydroabietic-acid
#15
Lan Lei, Danhua Xie, Binglei Song, Jianzhong Jiang, Xiaomei Pei, Zhenggang Cui
Innovation in the structure of surfactants is crucial to the construction of a surfactant-based system with intriguing properties. With dehydroabietic acid as a starting material, a nearly totally rigid azobenzene surfactant (R-azo-Na) was synthesized. The trans-R-azo-Na formed stable foams with half-lives of 636, 656, 976, and 872 min for 0.3, 1, 2, and 4 mmol∙L-1 aqueous solutions, respectively. Under UV light irradiation, a fast collapse of the foams was observed, showing an in situ response. The excellent foam stability of trans-R-azo-Na leads to the extremely high photoresponsive efficiency...
July 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28735222/effect-of-oleic-acid-on-the-properties-of-protein-adsorbed-layers-at-water-oil-interfaces-an-epr-study-combined-with-dynamic-interfacial-tension-measurements
#16
Eleni P Kalogianni, Leandros Sklaviadis, Stella Nika, Ioanna Theochari, Georgia Dimitreli, Despoina Georgiou, Vassiliki Papadimitriou
Multiphase food systems consist of complex interfacial layers where surface active molecules complete compete for adsorption and interact with one another affecting the interfacial properties and the behavior of the food systems involved. The present work focuses on the examination of interactions between proteins playing an which play an important role in milk-rich food systems (namely κ-casein and β-lactoglobulin) and oleic acid (an anionic surfactant abundant in food systems) at the oil/water interface...
July 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28735196/molecular-dynamics-simulation-of-sodium-dodecylsulfate-sds-bilayers
#17
Hongshu Zhang, Shiling Yuan, Jichao Sun, Jianqiang Liu, Haiping Li, Na Du, Wanguo Hou
Sodium dodecylsulfate (SDS) - a simple single tailed surfactant (STS) can form stable vesicles from its micellar solution without any additives under the mediation of solid surfaces. To further understand the mechanism of this transition on the molecular level, molecular dynamics simulations are performed to study segments of SDS bilayers (as part of vesicles) in the bulk solution systematically, at the moment that the lower leaflet of bilayers already detached from solid surfaces. The SDS membrane would rather keep their bilayers structure than return to micelles when the initial interdigitated degree (δi) between alkyl chains is more than 8...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735194/deposition-precipitation-preparation-of-ag-ag3po4-wo3-nanocomposites-for-efficient-visible-light-degradation-of-rhodamine-b-under-strongly-acidic-alkaline-conditions
#18
Qingyong Li, Fulei Wang, Yuxiang Hua, Yuting Luo, Xiaoheng Liu, Guorong Duan, Xujie Yang
A series of novel visible-light-driven Ag/Ag3PO4/WO3 (AAPW) Z-scheme heterostructures were fabricated using a facile deposition-precipitation method followed by photo-reduction without adding any surfactant. To explore more deeply about the photocatalytic activity of AAPW nanocomposites under neutral and strongly acidic/alkaline conditions, we investigated their photocatalytic rhodamine B (RhB) efficiency at different pH value that was controlled by adding HNO3 or NaOH aqueous solution. It was found that as-prepared AAPW photocatalysts showed enhanced photocatalytic RhB efficiency under neutral and even strongly acidic/alkaline environment...
July 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735189/studies-on-the-role-of-unsaturation-in-the-fatty-acid-surfactant-molecule-on-the-thermal-conductivity-of-magnetite-nanofluids
#19
Ramanujam Lenin, Pattayil Alias Joy
To study the role of unsaturation in the surfactant molecule on the thermal conductivity of magnetite nanofluids, four different fatty acid (stearic, oleic, linoleic, and linolenic acids with different degree of unsaturation) coated magnetite nanoparticles of comparable size are prepared and dispersed in toluene. It is found that the nanofluid with the saturated fatty acid coated nanoparticles show larger viscosity than the fluid with the unsaturated fatty acid coated particles at all concentrations. Thermal conductivity studies show enhancement only above a critical concentration for all fluids...
July 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28734731/postnatal-corticosteroids-to-prevent-or-treat-bronchopulmonary-dysplasia-who-might-benefit
#20
REVIEW
Lex W Doyle, Jeanie L Y Cheong
Newborn infants born very preterm are at high risk of developing bronchopulmonary dysplasia, which is associated with not only mortality but also adverse long-term neurological and respiratory outcomes in survivors. Postnatal corticosteroids might reduce the risk of developing bronchopulmonary dysplasia, or reduce its severity. However, it is important to minimize exposure to the potentially harmful effects of corticosteroids, particularly on the developing brain. Systemic corticosteroids started after the first week of life have shown the most benefit in infants at highest risk of developing bronchopulmonary dysplasia, whereas inhaled corticosteroids have little effect in children with established lung disease...
July 19, 2017: Seminars in Fetal & Neonatal Medicine
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