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https://www.readbyqxmd.com/read/28213042/gene-duplication-conservation-and-divergence-of-heme-oxygenase-2-genes-in-blunt-snout-bream-megalobrama-amblycephala-and-their-responses-to-hypoxia
#1
Xue-Li Zhang, Yi-Wen Sun, Jie Chen, Xia-Yun Jiang, Shu-Ming Zou
Heme oxygenase (HO) that catalyzes the degradation of heme, is involved in responding and using oxygen in teleost fish. Physiologic heme degradation can be catalyzed by two isozymes of HO (HO-1 and HO-2). In fish, the molecular constructions, expression characteristics and hypoxic regulation of HO-2 are still not well known. Here, we report the isolation and characterization of duplicated HO-2 genes in blunt snout bream, a hypoxia sensitive fish species. Blunt snout bream HO-2a and -2b genes shared a relatively low sequence identity of 67%...
April 30, 2017: Gene
https://www.readbyqxmd.com/read/28182947/ho-2-pockets-myristoylated-gag
#2
Marilyn D Resh
Membrane binding of viral and cellular N-myristoylated proteins can be regulated by selectively sequestering myristate. In this issue of Cell Host & Microbe, Zhu et al. (2017) report on a myristate binding site within the cellular protein heme oxygenase-2 that acts as a trap to inhibit N-myristoylated protein function.
February 8, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28152789/does-oncology-patient-reported-healthcare-experience-vary-by-site-of-care-soc
#3
Adrianne Waldman Casebeer, Sari Hopson, Joseph Dye, Zhuliang Tao, Andrew M Howe, Stephen Stemkowski, Jeffrey Patton, Art Small, Anthony Masaquel
71 Background: Patients with cancer are increasingly receiving chemotherapy infusions in a hospital outpatient (HO) as compared to the physician practice setting (PO). Previous research has focused on SOC differences in economic measures, such as healthcare costs, in commercially insured populations. This study investigates SOC differences in patients' reported healthcare experience for a mostly Medicare population. METHODS: A convenience sample of 2,604 Humana members with cancer of the breast, lung, colon/rectum or NHL/CLL and treated in 2014 received a survey by mail to capture patient reported healthcare experiences...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28132836/heme-oxygenase-2-binds-myristate-to-regulate-retrovirus-assembly-and-tlr4-signaling
#4
Yiping Zhu, Shukun Luo, Yosef Sabo, Cheng Wang, Liang Tong, Stephen P Goff
N-myristoylation is the covalent attachment of myristic acid to the N terminus of proteins in eukaryotic cells. The matrix domain (MA) of HIV-1 Gag protein is N-myristoylated and plays an important role in virus budding. In screening for host factors that interact with HIV-1 MA, we found that heme oxygenase (HO-2) specifically binds the myristate moiety of Gag. HO-2 was also found to bind TRAM, an adaptor protein for Toll-like receptor 4 (TLR4), and thereby impact both virus replication and cellular inflammatory responses...
February 8, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28127593/the-ferromagnetic-ln2co6-heterometallic-complexes
#5
Xiao-Qing Zhao, Jin Wang, Dong-Xu Bao, Shuo Xiang, Ya-Jun Liu, Yun-Chun Li
Four 3d-4f heterometallic complexes with the formula, {[Ln2Co6(OH)4(L1)6(L2)8(CH3CN)2]·nCH2Cl2} (Ln = Dy (1), n = 0.5; Ho (2), n = 1; Gd (3), n = 1; Y (4), n = 1; HL1 = 6-chloro-2-pyridinol, HL2 = pivalic acid), were synthesized. Single-crystal X-ray diffraction analyses revealed that complexes 1-4 consisted of a [Ln2Co6] core, featuring a Ln-Ln edge-sharing double-trigonal-bipyramid configuration. The magnetic susceptibilities revealed ferromagnetic coupling within complexes 1 and 2, and complex 1 displayed slow relaxation of magnetization...
January 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28115703/complementary-roles-of-gasotransmitters-co-and-h2s-in-sleep-apnea
#6
Ying-Jie Peng, Xiuli Zhang, Anna Gridina, Irina Chupikova, David L McCormick, Robert J Thomas, Thomas E Scammell, Gene Kim, Chirag Vasavda, Jayasri Nanduri, Ganesh K Kumar, Gregg L Semenza, Solomon H Snyder, Nanduri R Prabhakar
Sleep apnea, which is the periodic cessation of breathing during sleep, is a major health problem affecting over 10 million people in the United States and is associated with several sequelae, including hypertension and stroke. Clinical studies suggest that abnormal carotid body (CB) activity may be a driver of sleep apnea. Because gaseous molecules are important determinants of CB activity, aberrations in their signaling could lead to sleep apnea. Here, we report that mice deficient in heme oxygenase-2 (HO-2), which generates the gaseous molecule carbon monoxide (CO), exhibit sleep apnea characterized by high apnea and hypopnea indices during rapid eye movement (REM) sleep...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28088559/increased-expression-of-carbon-monoxide-producing-enzymes-in-the-mpoa-after-sexual-experience-in-male-rats
#7
Christopher L Robison, Jenna A McHenry, Elaine M Hull
The hypothalamus contains numerous nuclei involved in the regulation of reproductive, stress, circadian, and homeostatic behaviors, with many of these nuclei concentrated within the preoptic and anterior regions. The gaseous neurotransmitter, nitric oxide (NO), has already been shown to have an important regulatory role within the medial preoptic area (MPOA) of the anterior hypothalamus, where it facilitates sexual behaviors. However, little is known about the role of other gaseous neurotransmitters in this area...
January 12, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/27984168/the-protective-mechanism-of-docosahexaenoic-acid-in-mouse-model-of-parkinson-the-role-of-hemeoxygenase
#8
Ayse Ozkan, Hande Parlak, Gamze Tanriover, Sayra Dilmac, Seher Nasircilar Ulker, Llknur Birsen, Aysel Agar
Parkinson's disease (PD) is characterized by degeneration of the dopaminergic neurons in substantia nigra (SN). Its major clinical symptoms are tremor, rigidity, bradykinesia and postural instability. Docosahexaenoic acid (DHA) is an essential fatty acid for neural functions that resides within the neural membrane. A decline in fatty acid concentration is observed in case of neurodegenerative diseases such as PD. The present study aimed to explore the role of the heme oxygenase (HO) enzyme in protective effects of DHA administration in an experimental model of PD by using the neurotoxin 1-Methly-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)...
October 27, 2016: Neurochemistry International
https://www.readbyqxmd.com/read/27976590/highly-oxidized-second-generation-products-from-the-gas-phase-reaction-of-oh-radicals-with-isoprene
#9
Torsten Berndt, Hartmut Herrmann, Mikko Sipilä, Markku Kulmala
The gas-phase reaction of OH radicals with isoprene has been investigated in an atmospheric pressure flow tube at 293 ± 0.5 K with special attention to the second-generation products. Reaction conditions were optimized to achieve a predominant reaction of RO2 radicals with HO2 radicals. Chemical ionization-atmospheric pressure interface-time-of-flight mass spectrometry served as the analytical technique in order to follow the formation of RO2 radicals and closed-shell products containing at least four O atoms in the molecule...
December 29, 2016: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27826418/cysteine-independent-activation-inhibition-of-heme-oxygenase-2
#10
Dragic Vukomanovic, Mona N Rahman, Mahin D Maines, Terence Rs Ozolinš, Walter A Szarek, Zongchao Jia, Kanji Nakatsu
Reactive thiols of cysteine (cys) residues in proteins play a key role in transforming chemical reactivity into a biological response. The heme oxygenase-2 (HO-2) isozyme contains two cys residues that have been implicated in binding of heme and also the regulation of its activity. In this paper, we address the question of a role for cys residues for the HO-2 inhibitors or activators designed in our laboratory. We tested the activity of full length recombinant human heme oxygenase-2 (FL-hHO-2) and its analog in which cys265 and cys282 were both replaced by alanine to determine the effect on activation by menadione (MD) and inhibition by QC-2350...
March 2016: Medical Gas Research
https://www.readbyqxmd.com/read/27825819/interaction-between-endogenous-carbon-monoxide-and-hydrogen-sulfide-in-the-mechanism-of-gastroprotection-against-acute-aspirin-induced-gastric-damage
#11
Marcin Magierowski, Katarzyna Magierowska, Magdalena Hubalewska-Mazgaj, Juliusz Adamski, Dominik Bakalarz, Zbigniew Sliwowski, Robert Pajdo, Slawomir Kwiecien, Tomasz Brzozowski
Acetylsalicylic acid (ASA) is mainly recognized as painkiller or anti-inflammatory drug. However, ASA causes serious side effects towards gastrointestinal (GI) tract which limits its usefulness. Carbon monoxide (CO) and hydrogen sulfide (H2S) have been described to act as important endogenous messengers and mediators of gastroprotection but whether they can interact in gastroprotection against acute ASA-induced gastric damage remains unknown. In this study male Wistar rats were pretreated with 1) vehicle (saline, i...
December 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27662030/non-exchanging-hydroxyl-groups-on-the-surface-of-cellulose-fibrils-the-role-of-interaction-with-water
#12
Erik L Lindh, Malin Bergenstråhle-Wohlert, Camilla Terenzi, Lennart Salmén, István Furó
The interaction of water with cellulose stages many unresolved questions. Here (2)H MAS NMR and IR spectra recorded under carefully selected conditions in (1)H-(2)H exchanged, and re-exchanged, cellulose samples are presented. It is shown here, by a quantitative and robust approach, that only two of the three available hydroxyl groups on the surface of cellulose fibrils are exchanging their hydrogen with the surrounding water molecules. This finding is additionally verified and explained by MD simulations which demonstrate that the (1)HO(2) and (1)HO(6) hydroxyl groups of the constituting glucose units act as hydrogen-bond donors to water, while the (1)HO(3) groups behave exclusively as hydrogen-bond acceptors from water and donate hydrogen to their intra-chain neighbors O(5)...
November 3, 2016: Carbohydrate Research
https://www.readbyqxmd.com/read/27565814/cystathionine-%C3%AE-synthase-and-pgrmc1-as-co-sensors
#13
Yasuaki Kabe, Takehiro Yamamoto, Mayumi Kajimura, Yuki Sugiura, Ikko Koike, Mitsuyo Ohmura, Takashi Nakamura, Yasuhito Tokumoto, Hitoshi Tsugawa, Hiroshi Handa, Takuya Kobayashi, Makoto Suematsu
Heme oxygenase (HO) is a mono-oxygenase utilizing heme and molecular oxygen (O2) as substrates to generate biliverdin-IXα and carbon monoxide (CO). HO-1 is inducible under stress conditions, while HO-2 is constitutive. A balance between heme and CO was shown to regulate cell death and survival in many experimental models. However, direct molecular targets to which CO binds to regulate cellular functions remained to be fully examined. We have revealed novel roles of CO-responsive proteins, cystathionine β-synthase (CBS) and progesterone receptor membrane component 1 (PGRMC1), in regulating cellular functions...
August 24, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27541924/hydrogen-sulfide-and-carbon-monoxide-protect-gastric-mucosa-compromised-by-mild-stress-against-alendronate-injury
#14
Marcin Magierowski, Katarzyna Magierowska, Jakub Szmyd, Marcin Surmiak, Zbigniew Sliwowski, Slawomir Kwiecien, Tomasz Brzozowski
BACKGROUND: Alendronate is an inhibitor of osteoclast-mediated bone resorption, but its clinical utility is limited due to gastrointestinal complications including bleeding erosions. AIMS: We studied whether potent vasodilators hydrogen sulfide (H2S) and carbon monoxide (CO) can protect against alendronate-induced gastric lesions in rats exposed to mild stress. METHODS: Three series (A, B, and C) of Wistar rats received alendronate (150-700 mg/kg i...
November 2016: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/27531649/h2s-production-by-reactive-oxygen-species-in-the-carotid-body-triggers-hypertension-in-a-rodent-model-of-sleep-apnea
#15
Guoxiang Yuan, Ying-Jie Peng, Shakil A Khan, Jayasri Nanduri, Amritha Singh, Chirag Vasavda, Gregg L Semenza, Ganesh K Kumar, Solomon H Snyder, Nanduri R Prabhakar
Sleep apnea is a prevalent respiratory disease in which episodic cessation of breathing causes intermittent hypoxia. Patients with sleep apnea and rodents exposed to intermittent hypoxia exhibit hypertension. The carotid body senses changes in blood O2 concentrations, and an enhanced carotid body chemosensory reflex contributes to hypertension in sleep apnea patients. A rodent model of intermittent hypoxia that mimics blood O2 saturation profiles of patients with sleep apnea has shown that increased generation of reactive oxygen species (ROS) in the carotid body enhances the chemosensory reflex and triggers hypertension...
August 16, 2016: Science Signaling
https://www.readbyqxmd.com/read/27436489/suppression-of-trpv4-channels-ameliorates-anti-dipsogenic-effects-under-hypoxia-in-the-subfornical-organ-of-rats
#16
Fan Yang, Li Zhou, Dong Wang, Li-Li Yang, Guo-Rong Yuan, Qing-Yuan Huang
The phenomenon of water intake reduction during the 1(st) day of hypobaric hypoxia has been known for a long time. However, the reason for the same is yet unknown. The transient receptor potential vanilloid (TRPV) channels, including TRPV1 and TRPV4, are located in the subfornical organ (SFO). These are calcium permeable cationic channels gated by various stimuli such as cell swelling, low pH, and high temperature, and participate in anti-dipsogenic effects when activated. We aimed to explore the drinking behavior of rats and the mechanism of TRPVs under hypoxia...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27383795/effects-of-dissolved-organic-matter-on-phototransformation-rates-and-dioxin-products-of-triclosan-and-2-ho-bde-28-in-estuarine-water
#17
Ya-Nan Zhang, Qing Xie, Guoxin Sun, Kuixing Yang, Shuainan Song, Jingwen Chen, Chengzhi Zhou, Yingjie Li
Photochemical transformation of hydroxylated polyhalodiphenyl ethers (HO-PXDEs) has attracted much attention for their ubiquitous presence and the photochemical formation of highly toxic dioxins. Dissolved organic matter (DOM) plays an important role in the environmental photochemical transformation of organic pollutants. However, the effects of DOM on the photolysis kinetics and dioxin formation of HO-PXDEs are still not fully understood. Herein, the effects of Suwannee River natural organic matter (SRNOM) on the phototransformation of 2'-HO-2,4,4'-trichlorodiphenyl ether (triclosan) and 2'-HO-2,4,4'-tribromodiphenyl ether (2'-HO-BDE-28) were investigated in artificial estuarine water (AEW)...
September 14, 2016: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/27023525/the-protective-role-of-carbon-monoxide-co-produced-by-heme-oxygenases-and-derived-from-the-co-releasing-molecule-corm-2-in-the-pathogenesis-of-stress-induced-gastric-lesions-evidence-for-non-involvement-of-nitric-oxide-no
#18
Katarzyna Magierowska, Marcin Magierowski, Marcin Surmiak, Juliusz Adamski, Agnieszka Irena Mazur-Bialy, Robert Pajdo, Zbigniew Sliwowski, Slawomir Kwiecien, Tomasz Brzozowski
Carbon monoxide (CO) produced by heme oxygenase (HO)-1 and HO-2 or released from the CO-donor, tricarbonyldichlororuthenium (II) dimer (CORM-2) causes vasodilation, with unknown efficacy against stress-induced gastric lesions. We studied whether pretreatment with CORM-2 (0.1-10 mg/kg oral gavage (i.g.)), RuCl₃ (1 mg/kg i.g.), zinc protoporphyrin IX (ZnPP) (10 mg/kg intraperitoneally (i.p.)), hemin (1-10 mg/kg i.g.) and CORM-2 (1 mg/kg i.g.) combined with N(G)-nitro-l-arginine (l-NNA, 20 mg/kg i.p.), 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ, 10 mg/kg i...
March 24, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/26998868/a-novel-biocompatible-conducting-polyvinyl-alcohol-pva-polyvinylpyrrolidone-pvp-hydroxyapatite-hap-composite-scaffolds-for-probable-biological-application
#19
B Chaudhuri, B Mondal, S K Ray, S C Sarkar
We have prepared biocompatible composites of 80wt% polyvinyl alcohol (PVA)-(20wt%) polyvinylpyrrolidone (PVP) blend with different concentrations of bioactive nanohydroxyapatite, Ca10(PO4)6(HO)2 (HAP). The composite films demonstrated maximum effective conductivity (σ∼1.64×10(-4)S/m) and effective dielectric constant (ε∼290) at percolation threshold concentration (∼10wt% HAP) at room temperature. These values of σ and ε are much higher than those of PVA, PVP or HAP. Our preliminary observation indicated excellent biocompatibility of the electrospun fibrous meshes of two of these composites with different HAP contents (8...
July 1, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/26994186/evidence-for-a-role-of-heme-oxygenase-1-in-the-control-of-cardiac-function-in-zebrafish-danio-rerio-larvae-exposed-to-hypoxia
#20
Velislava Tzaneva, Steve F Perry
Carbon monoxide (CO) is a gaseous neurotransmitter produced from the breakdown of heme via heme oxygenase-1 (HO-1; hypoxia-inducible isoform) and heme oxygenase-2 (HO-2; constitutively expressed isoform). In mammals, CO is involved in modulating cardiac function. The role of the HO-1/CO system in the control of heart function in fish, however, is unknown and investigating its physiological function in lower vertebrates will provide a better understanding of the evolution of this regulatory mechanism. We explored the role of the HO-1/CO system in larval zebrafish (Danio rerio) in vivo by investigating the impact of translational gene knockdown of HO-1 on cardiac function...
May 15, 2016: Journal of Experimental Biology
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