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Oxygen sensing

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https://www.readbyqxmd.com/read/28106401/transmembrane-difference-in-colloid-osmotic-pressure-affects-the-lipid-membrane-fluidity-of-liposomes-encapsulating-a-concentrated-protein-solution
#1
Tomoko Kure, Hiromi Sakai
A hemoglobin vesicle (Hb-V) is an artificial oxygen carrier encapsulating a highly concentrated hemoglobin solution (40 g/dL) in a liposome. The in vivo safety and efficacy of Hb-V suspension as a transfusion alternative and structural stability during storage have been studied extensively. Because the intra-liposomal Hb aqueous solution can possess colloid osmotic pressure (COP, 200-300 Torr), which is much higher than that of blood plasma (20-25 Torr), a question arises of whether the lipid membrane senses the transmembrane difference in COP...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098356/mechano-chemo-transduction-in-cardiac-myocytes
#2
Ye Chen-Izu, Leighton T Izu
The heart has the ability to adjust to changing mechanical loads. The Frank-Starling law and the Anrep effect describe exquisite intrinsic mechanisms the heart has for autoregulating the force of contraction to maintain cardiac output under preload and afterload. Although these mechanisms have been known for more than a century, their cellular and molecular underpinnings are still debated. How does the cardiac myocyte sense a change in preload or afterload? How does the myocyte adjust its response to compensate for such changes? In cardiac myocytes Ca(2+) is a crucial regulator of contractile force and in this review we compare and contrast recent results from different labs that address two important questions...
January 18, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28096464/functional-transformation-of-c-reactive-protein-by-hydrogen-peroxide
#3
Sanjay K Singh, Avinash Thirumalai, Asmita Pathak, Donald N Ngwa, Alok Agrawal
C-reactive protein (CRP) is present at sites of inflammation including amyloid plaques, atherosclerotic lesions and arthritic joints. CRP, in its native pentameric structural conformation, binds to cells and molecules which have exposed phosphocholine (PCh) groups. CRP, in its non-native pentameric structural conformation, binds to a variety of deposited, denatured and aggregated proteins, in addition to binding to PCh-containing substances. In this study, we investigated the effects of hydrogen peroxide (H2O2), a prototypical reactive oxygen species and which is also present at sites of inflammation, on the ligand recognition function of CRP...
January 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28094961/enhancing-the-sensing-properties-of-tio2-nanosheets-with-exposed-001-facets-by-a-hydrogenation-and-sensing-mechanism
#4
Ye Wang, Junfang Liu, Miao Wang, Cuijin Pei, Bin Liu, Yukun Yuan, Shengzhong Liu, Heqing Yang
Hydrogenation is successfully employed to improve sensing performances of the gas sensors based on TiO2 nanosheets with exposed {001} facets for the first time. The hydrogenated TiO2 nanosheets show a significantly higher response toward ethanol, acetone, triethylamine, or formaldehyde than the samples without hydrogenation, and the response further increases with an increase of the hydrogenation temperature. The excellent sensing performances are ascribed to an increase of the density of unsaturated Ti5c atoms on the {001} surface resulting from the hydrogenation process...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28093675/solar-photocatalytic-degradation-of-textile-effluent-with-tio2-zno-and-nb2o5-catalysts-assessment-of-photocatalytic-activity-and-mineralization
#5
Renata P Souza, Elizangela Ambrosio, Maisa T F Souza, Thábata K F S Freitas, Ana M Ferrari-Lima, Juliana C Garcia
The photocatalytic degradation of textile effluent was investigated using TiO2, ZnO, and Nb2O5 catalysts under solar irradiation. The procedures were carried out at ambient conditions in April 2014, with pH 3.0 and catalyst concentration of 0.250 g L(-1). The photocatalytic activity of the oxides was evaluated by means of kinetic efficiency (rate constant and half-life time), chemical oxygen demand reduction, and absorbance reduction at 228, 254, 284, 310, 350, 500, and 660 nm (λmáx). Mineralization in terms of the formation of inorganic ions and toxicity reduction using bioassays with Artemia salina were performed...
January 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091783/lifetime-based-oxygen-sensing-properties-of-palladium-ii-and-platinum-ii-meso-tetrakis-4-phenylethynyl-phenylporphyrin
#6
Emel Önal, Stephan Saß, Jeanne Hurpin, Kadriye Ertekin, Sevinc Zehra Topal, Michael U Kumke, Catherine Hirel
High oxygen permeable [poly(TMSP)] nanofibers incorporating porphyrin macrocycle as luminescence indicators were prepared by electrospinning technique. The porphyrins involves were modified by i) introducing phenylacetylide substituents on the para position of the phenyl moieties and ii) varying the metal centers [Pt(II) or Pd(II)] of the meso-tetrakisphenylporphyrins. A set of nanofibers; (Pt-TPP)NF, (Pd-TPP)NF, (Pt-TPA)NF and (Pd-TPA)NF were obtained to study their structure-activity relationship toward oxygen...
January 14, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28090285/pulmonary-vascular-and-ventricular-dysfunction-in-the-susceptible-patient-2015-grover-conference-series
#7
REVIEW
Bradley A Maron, Roberto F Machado, Larissa Shimoda
Pulmonary blood vessel structure and tone are maintained by a complex interplay between endogenous vasoactive factors and oxygen-sensing intermediaries. Under physiological conditions, these signaling networks function as an adaptive interface between the pulmonary circulation and environmental or acquired perturbations to preserve oxygenation and maintain systemic delivery of oxygen-rich hemoglobin. Chronic exposure to hypoxia, however, triggers a range of pathogenetic mechanisms that include hypoxia-inducible factor 1α (HIF-1α)-dependent upregulation of the vasoconstrictor peptide endothelin 1 in pulmonary endothelial cells...
December 2016: Pulmonary Circulation
https://www.readbyqxmd.com/read/28089830/tumor-suppressor-spop-ubiquitinates-and-degrades-egln2-to-compromise-growth-of-prostate-cancer-cells
#8
Linli Zhang, Shan Peng, Xiangpeng Dai, Wenjian Gan, Xin Nie, Wenyi Wei, Guoqing Hu, Jianping Guo
EglN prolyl hydroxylases, a family of oxygen-sensing enzymes, hydroxylate distinct proteins to modulate diverse physiopathological signals. Aberrant regulations of EglNs result in multiple human diseases, including cancer. Different from EglN1 which function largely depends on the role of hypoxia-induce factor alpha (HIFα) in tumors, the functional significance and the upstream regulatory mechanisms of EglN2, especially in prostate cancer setting, remain largely unclear. Here, we demonstrated that dysregulation of EglN2 facilitated prostate cancer growth both in cells and in vivo...
January 13, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28088479/three-dimensional-structure-of-full-length-ntrx-an-unusual-member-of-the-ntrc-family-of-response-regulators
#9
Ignacio Fernández, Irina Cornaciu, Mariela Del Carmen Carrica, Emiko Uchikawa, Guillaume Hoffmann, Rodrigo Sieira, José Antonio Márquez, Fernando A Goldbaum
Bacteria sense and adapt to environmental changes using two-component systems (TCS). These signaling pathways are formed by a histidine kinase (HK) that phosphorylates a response regulator (RR), which finally modulates the transcription of target genes. The bacterium Brucella abortus codes for a TCS formed by the HK NtrY and the RR NtrX that participates in sensing low oxygen tension and in generating an adaptive response. NtrX is a modular protein with REC, AAA+ and DNA binding domains, an architecture that classifies it among the NtrC subfamily of RRs...
January 11, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28087991/an-exceptionally-selective-dna-cooperatively-binding-two-ca2-ions
#10
Wenhu Zhou, Runjhun Saran, Po-Jung Jimmy Huang, Jinsong Ding, Juewen Liu
Ca2+ is a highly important metal ion in biology and in the environment, leading to extensive work in developing sensors for Ca2+ detection. While many Ca2+ binding proteins are known, few nucleic acids can selectively bind Ca2+. DNA-based biosensors are attractive for its high stability and excellent programmability. Herein, we report a RNA-cleaving DNAzyme named EtNa cooperatively binding two Ca2+ ions but only one Mg2+. Four DNAzymes with known Ca2+-dependent activity were compared, and the EtNa has the best selectivity...
January 14, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28080210/pathogen-control-at-the-intestinal-mucosa-h2o2-to-the-rescue
#11
Ulla G Knaus, Rosanne Hertzberger, Gratiela G Pircalabioru, S Parsa M Yousefi, Filipe Branco Dos Santos
Intestinal infections are a global challenge, connected to malnutrition and inadequate hygiene in developing countries, and to expanding antibiotic resistance in developed countries. In general, a healthy host is capable of fighting off gut pathogens or at least to recover from infections quickly. The underlying protective mechanism, termed colonization resistance, is provided by indigenous commensal communities (microbiota) that are shaped and aided by the host's epithelial and innate immune system. (1) Commensal-pathogen interactions are governed by competition for a suitable niche for replication and stable colonization, nutrient availability, species-specific alterations of the metabolic environment, changes in oxygen tension and release of chemicals and proteinaceous toxins (bacteriocins)...
January 12, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28077104/effects-of-treadmill-exercise-versus-flutter%C3%A2-on-respiratory-flow-and-sputum-properties-in-adults-with-cystic-fibrosis-a-randomised-controlled-cross-over-trial
#12
Tiffany J Dwyer, Rahizan Zainuldin, Evangelia Daviskas, Peter T P Bye, Jennifer A Alison
BACKGROUND: Treadmill exercise and airway clearance with the Flutter® device have previously been shown to improve mucus clearance mechanisms in people with cystic fibrosis (CF) but have not been compared. It is therefore not known if treadmill exercise is an adequate form of airway clearance that could replace established airway clearance techniques, such as the Flutter®. The aim of this study was to evaluate respiratory flow, sputum properties and subjective responses of treadmill exercise and Flutter® therapy, compared to resting breathing (control)...
January 11, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28069738/fbxl5-inactivation-in-mouse-brain-induces-aberrant-proliferation-of-neural-stem-progenitor-cells
#13
Takayoshi Yamauchi, Masaaki Nishiyama, Toshiro Moroishi, Atsuki Kawamura, Keiichi I Nakayama
FBXL5 is the substrate recognition subunit of an SCF-type ubiquitin ligase that serves as a master regulator of iron metabolism in mammalian cells. We previously showed that mice with systemic deficiency of FBXL5 fail to sense intracellular iron levels and die in utero at embryonic day (E) 8.5 as a result of iron overload and subsequent oxidative stress. This early embryonic mortality has thus impeded study of the role of FBXL5 in brain development. We have now generated mice lacking FBXL5 specifically in Nestin-expressing neural stem-progenitor cells (NSPCs) in the brain...
January 9, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28054425/synergism-between-soluble-guanylate-cyclase-signaling-and-neuropeptides-extends-lifespan-in-the-nematode-caenorhabditis-elegans
#14
Rachel Abergel, Leonid Livshits, Maayan Shaked, Arijit Kumar Chatterjee, Einav Gross
Oxygen (O2 ) homeostasis is important for all aerobic animals. However, the manner by which O2 sensing and homeostasis contribute to lifespan regulation is poorly understood. Here, we use the nematode Caenorhabditis elegans to address this question. We demonstrate that a loss-of-function mutation in the neuropeptide receptor gene npr-1 and a deletion mutation in the atypical soluble guanylate cyclase gcy-35 O2 sensor interact synergistically to extend worm lifespan. The function of npr-1 and gcy-35 in the O2 -sensing neurons AQR, PQR, and URX shortens the lifespan of the worm...
January 4, 2017: Aging Cell
https://www.readbyqxmd.com/read/28051298/the-activity-of-jmjc-histone-lysine-demethylase-kdm4a-is-highly-sensitive-to-oxygen-concentrations
#15
Rebecca L Hancock, Norma Masson, Kate Dunne, Emily Flashman, Akane Kawamura
The JmjC-histone lysine demethylases (KDMs) are epigenetic regulators involved in the removal of methyl groups from post-translationally modified lysyl residues within the histone tails, modulating gene transcription. These enzymes require molecular oxygen for catalytic activity and, as 2-oxoglutarate (2OG) dependent oxygenases, are related to the cellular oxygen sensing HIF hydroxylases PHD2 and FIH. Recent studies have indicated that the activity of some KDMs, including the pseudogene-encoded KDM4E, may be sensitive to changing oxygen concentrations...
January 4, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28046077/an-oxygen-sensing-two-component-system-in-the-burkholderia-cepacia-complex-regulates-biofilm-intracellular-invasion-and-pathogenicity
#16
Matthew M Schaefers, Tiffany L Liao, Nicole M Boisvert, Damien Roux, Deborah Yoder-Himes, Gregory P Priebe
Burkholderia dolosa is a member of the Burkholderia cepacia complex (BCC), which is a group of bacteria that cause chronic lung infection in patients with cystic fibrosis (CF) and can be associated with outbreaks carrying high morbidity and mortality. While investigating the genomic diversity of B. dolosa strains collected from an outbreak among CF patients, we previously identified fixL as a gene showing signs of strong positive selection. This gene has homology to fixL of the rhizobial FixL/FixJ two-component system...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28042606/oxygen-sensing-difluoroboron-%C3%AE-diketonate-polylactide-materials-with-tunable-dynamic-ranges-for-wound-imaging
#17
Christopher A DeRosa, Scott A Seaman, Alexander S Mathew, Catherine M Gorick, Ziyi Fan, James N Demas, Shayn M Peirce, Cassandra L Fraser
Difluoroboron β-diketonate poly(lactic acid) materials exhibit both fluorescence (F) and oxygen sensitive room-temperature phosphorescence (RTP). Introduction of halide heavy atoms (Br and I) is an effective strategy to control the oxygen sensitivity in these materials. A series of naphthyl-phenyl (nbm) dye derivatives with hydrogen, bromide and iodide substituents were prepared for comparison. As nanoparticles, the hydrogen derivative was hypersensitive to oxygen (0-0.3%), while the bromide analogue was suited for hypoxia detection (0-3% O2)...
November 23, 2016: ACS Sensors
https://www.readbyqxmd.com/read/28042311/preventing-radiobleaching-of-cyanine-fluorophores-enhances-stability-of-nuclear-nirf-multimodality-imaging-agents
#18
Reinier Hernandez, Sandra Heskamp, Mark Rijpkema, Desirée L Bos, David M Goldenberg, William J McBride, Alfred Morgenstern, Frank Bruchertseifer, Weibo Cai, Otto C Boerman
Despite the large interest in nuclear/optical multimodality imaging, the effect of radiation on the fluorescence of fluorophores remains largely unexplored. Herein, we report on the radiobleaching of cyanine fluorophores and describe conditions to provide robust radioprotection under practical (pre)clinical settings. We determined the radiosensitivity of several cyanine fluorescent compounds, including IRDye 800CW (800CW) and a dual modality imaging tetrapeptide containing DOTA as chelator and Dylight 800 as fluorophore, exposed to increasing activities of (111)In, (68)Ga, or (213)Bi (γ, EC/β, and α emitter, respectively)...
2017: Theranostics
https://www.readbyqxmd.com/read/28039194/sequence-and-functional-characterization-of-hypoxia-inducible-factors-hif1%C3%AE-hif2%C3%AE-a-and-hif3%C3%AE-from-the-estuarine-fish-fundulus-heteroclitus
#19
Ian K Townley, Sibel I Karchner, Elena Skripnikova, Thomas E Wiese, Mark E Hahn, Bernard B Rees
The hypoxia inducible factor (HIF) family of transcription factors plays central roles in the development, physiology, pathology, and environmental adaptation of animals. Because many aquatic habitats are characterized by episodes of low dissolved oxygen, fish represent ideal models to study the roles of HIF in the response to aquatic hypoxia. The estuarine fish Fundulus heteroclitus occurs in habitats prone to hypoxia, it responds to low oxygen via behavioral, physiological, and molecular changes, and one member of the HIF family, HIF2α, has been previously described...
December 30, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28032501/single-particle-ratiometric-pressure-sensing-based-on-double-sensor-colloidal-nanocrystals
#20
Monica Lorenzon, Valerio Pinchetti, Francesco Bruni, Wan Ki Bae, Francesco Meinardi, Victor I Klimov, Sergio Brovelli
Ratiometric pressure sensitive paints (r-PSPs) are all-optical probes for monitoring oxygen flows in the vicinity of complex or miniaturized surfaces. They typically consist of a porous binder embedding mixtures of a reference and a sensor chromophore exhibiting oxygen-insensitive and oxygen-responsive luminescence, respectively. Here, we demonstrate the first example of an r-PSP based on a single two-color emitter that removes limitations of r-PSPs based on chromophore mixtures such as different temperature dependencies of the two chromophores, cross-readout between the reference and sensor signals and phase segregation...
January 10, 2017: Nano Letters
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