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https://www.readbyqxmd.com/read/29037851/cobalamin-associated-superoxide-scavenging-in-neuronal-cells-is-a-potential-mechanism-for-vitamin-b12-deprivation-optic-neuropathy
#1
Wesley Chan, Mohammadali Almasieh, Maria-Magdalena Catrinescu, Leonard A Levin
Chronic deficiency of vitamin B12 is the only nutritional deficiency definitively proven to cause optic neuropathy and loss of vision. The mechanism by which this occurs is unknown. Optic neuropathies are associated with death of retinal ganglion cells (RGCs), neurons that project their axons along the optic nerve to the brain. Injury to RGC axons causes a burst of intracellular superoxide, which then signals RGC apoptosis. Vitamin B12 (cobalamin) was recently shown to be a superoxide scavenger, with a rate constant similar to superoxide dismutase...
October 13, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29034961/a-randomized-trial-of-automated-intermittent-ropivacaine-administration-vs-continuous-infusion-in-an-interscalene-catheter
#2
J Oxlund, A H Clausen, S Venø, M D Nielsen, M Pall, T Strøm, P Toft
BACKGROUND: Ultrasound-guided interscalene nerve block with ropivacaine as local anesthetic agent given as boluses or continuous infusion is the preferred pain management after major shoulder surgery. The use of automated intermittent boluses has been shown to be superior to continuous infusion in sciatic and epidural nerve block. HYPOTHESIS: Automated intermittent boluses reduce pain after major shoulder surgery. METHODS: Seventy patients aged 18-75 years, scheduled for major shoulder surgery under general anesthesia with interscalene nerve block were included in this randomized controlled trial...
October 16, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29034187/electrical-nerve-stimulation-for-xerostomia-a-meta-analysis-of-randomised-controlled-trials
#3
REVIEW
Gowri Sivaramakrishnan, Kannan Sridharan
BACKGROUND: Xerostomia leads to caries, infection and overall psychological discomfort. Salivary substitutes and pharmacological agents have been tried only with temporary relief. The use of transcutaneous electrical nerve stimulation (TENS) has been contemplated on by various researchers for treatment of xerostomia. We carried out the present review as a systematic compilation and quantitative synthesis of the existing evidence related to the utility of TENS in patients with xerostomia...
October 2017: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/29032094/bicarbonate-activated-hydrogen-peroxide-and-efficient-decontamination-of-toxic-sulfur-mustard-and-nerve-gas-simulants
#4
Sanping Zhao, Hailing Xi, Yanjun Zuo, Qi Wang, Zhicheng Wang, Zengyuan Yan
(13)C NMR spectra showed that peroxymonocarbonate (HCO4(-)) was generated in the NaHCO3-activated H2O2 solution and pH was a key factor in its production. A cycle for the bicarbonate anion was proposed as HCO3(-)→HCO3 → (CO2)2*→CO2(aq)→HCO4(-) (H2CO4)→HCO3(-) (HCO3) basing on the results of NMR, electron paramagnetic resonance, chemiluminescence analysis. In this cycle, (CO2)2* was the key intermediate and (CO2)2*→2CO2+hv was the rate controlling step. Thioanisole and paraoxon, the simulants of sulfur mustard gas and nerve gas, respectively, were efficiently decontaminated by the NaHCO3-activated H2O2 solution...
October 2, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29029631/neurotrophic-support-by-traumatized-muscle-derived-multipotent-progenitor-cells-role-of-endothelial-cells-and-vascular-endothelial-growth-factor-a
#5
Heidi R H Zupanc, Peter G Alexander, Rocky S Tuan
BACKGROUND: Adult mesenchymal stem cells (MSCs) have been shown to increase nerve regeneration in animal models of nerve injury. Traumatized muscle-derived multipotent progenitor cells (MPCs) share important characteristics with MSCs and are isolated from severely damaged muscle tissue following surgical debridement. Previous investigations have shown that MPCs may be induced to increase production of several neurotrophic factors, suggesting the possible utility of autologous MPCs in peripheral nerve regeneration following injury...
October 13, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29026428/evaluation-of-the-physiological-activity-of-venom-from-the-eurasian-water-shrew-neomys-fodiens
#6
Krzysztof Kowalski, Paweł Marciniak, Grzegorz Rosiński, Leszek Rychlik
BACKGROUND: Animal toxins can have medical and therapeutic applications. Principally, toxins produced by insects, arachnids, snakes and frogs have been characterized. Venomous mammals are rare, and their venoms have not been comprehensively investigated. Among shrews, only the venom of Blarina brevicauda has been analysed so far, and blarina toxin has been proven to be its main toxic component. It is assumed that Neomys fodiens employs its venom to hunt larger prey. However, the toxic profile, properties and mode of action of its venom are largely unknown...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/29025656/dual-delivery-of-vegf-and-ngf-by-emulsion-electrospun-nanofibrous-scaffold-for-peripheral-nerve-regeneration
#7
Bin Xia, Yonggang Lv
Controlled delivery of multiple therapeutic agents can be considered an effective approach in nerve injury due to its multifunction. In this study, recombinant human vascular endothelial growth factor (VEGF) and recombinant human nerve growth factor (NGF) were loaded on the surface and in the core of emulsion electrospun poly (l-lactic acid) (PLLA) nanofibrous scaffold, respectively. The in vitro studies showed that VEGF and NGF had a sequential release pattern in which most of the VEFG was released in the first few days but the NGF could be continuously released for >1month...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29024789/in-vitro-pharmacological-characterization-of-the-bispyridinium-non-oxime-compound-mb327-and-its-2-and-3-regioisomers
#8
K V Niessen, T Seeger, S Rappenglück, T Wein, G Höfner, K T Wanner, H Thiermann, F Worek
The primary toxic mechanism of organophosphorus compounds, i.e. nerve agents or pesticides, is based on the irreversible inhibition of acetylcholinesterase. In consequence of the impaired hydrolysis, the neurotransmitter acetylcholine accumulates in cholinergic synapses and disturbs functional activity of nicotinic and muscarinic acetylcholine receptors by overstimulation and subsequent desensitization. The resulting cholinergic syndrome will become acute life-threatening, if not treated adequately. The current standard treatment, consisting of administration of a competitive mAChR antagonist (e...
October 9, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29023806/the-percutaneous-toxicokinetics-of-vx-in-a-damaged-skin-porcine-model-and-the-evaluation-of-woundstat%C3%A2-as-a-topical-decontaminant
#9
Helen Lydon, Charlotte Hall, Hazem Matar, Christopher Dalton, J Kevin Chipman, John S Graham, Robert P Chilcott
This study used a damaged skin, porcine model to evaluate the in vivo efficacy of WoundStat™ for the decontamination of superficial, nerve agent-contaminated wounds. Anaesthetized animals were randomly assigned to either control (n = 7), no decontamination (n = 12) or WoundStat™ (n = 12) treatment groups. Pigs were exposed to a 5× LD50 dose of neat, radiolabelled S-[2-(diisopropylamino)ethyl]-O-ethyl methyl-phosphonothioate (VX; or equivalent volume of sterile saline for the control group) via an area of superficially damaged skin on the ear...
October 10, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29023426/nanometric-mil-125-nh%C3%A2-metal-organic-framework-as-a-potential-nerve-agent-antidote-carrier
#10
Sérgio M F Vilela, Pablo Salcedo-Abraira, Isabelle Colinet, Fabrice Salles, Martijn C de Koning, Marloes J A Joosen, Christian Serre, Patricia Horcajada
The three-dimensional (3D) microporous titanium aminoterephthalate MIL-125-NH₂ (MIL: Material of Institut Lavoisier) was successfully isolated as monodispersed nanoparticles, which are compatible with intravenous administration, by using a simple, safe and low-cost synthetic approach (100 °C/32 h under atmospheric pressure) so that for the first time it could be considered for encapsulation and the release of drugs. The nerve agent antidote 2-[(hydroxyimino)methyl]-1-methyl-pyridinium chloride (2-PAM or pralidoxime) was effectively encapsulated into the pores of MIL-125-NH₂ as a result of the interactions between 2-PAM and the pore walls being mediated by π-stacking and hydrogen bonds, as deduced from infrared spectroscopy and Monte Carlo simulation studies...
October 12, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29023181/review-for-disease-of-the-year-varicella-zoster-virus-induced-anterior-uveitis
#11
Ilknur Tugal-Tutkun, Luca Cimino, Yonca Aydin Akova
Varicella zoster virus (VZV)-induced anterior uveitis (AU) may complicate the course of primary varicella infection typically seen in children. In adults, especially with advanced age, VZV AU is more commonly associated with herpes zoster ophthalmicus (HZO) with or without skin rash affecting the distribution of the ophthalmic nerve due to reactivation of the latent VZV in the trigeminal ganglion. While it is typically a mild self-limiting AU in primary infection, HZO AU is often accompanied by keratitis, may have a chronic recurrent course, and lead to sectoral iris atrophy, pupillary distortion, and ocular hypertension...
October 12, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/29022690/metallic-vs-semiconducting-swcnt-chemiresistors-a-case-for-separated-swcnts-wrapped-by-metallo-supramolecular-polymer
#12
Shinsuke Ishihara, Curtis J O'Kelly, Takeshi Tanaka, Hiromichi Kataura, Jan Labuta, Yoshitaka Shingaya, Tomonobu Nakayama, Takeo Ohsawa, Takashi Nakanishi, Timothy M Swager
As-synthesized single-walled carbon nanotubes (SWCNTs) are a mixture of metallic and semiconducting tubes, and separation is essential to improve the performances of SWCNT-based electric devices. Our chemical sensor monitors the conductivity of a SWCNT network, wherein each tube is wrapped by insulating metallo-supramolecular polymer (MSP). Vapors of strong electro-philes such as diethyl chlorophosphate (DECP), a nerve agent simulant, can trigger disassembly of MSP, resulting in conductive SWCNT pathways. Herein, we report that separated SWCNTs have a large impact on the sensitivity and selectivity of chemical sensors...
October 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29019446/the-role-of-the-oximes-hi-6-and-hs-6-inside-human-acetylcholinesterase-inhibited-with-nerve-agents-a-computational-study
#13
Teobaldo Cuya, Arlan da Silva Gonçalves, Jorge Alberto Valle da Silva, Teodorico C Ramalho, Kamil Kuca, Tanos C C França
Abstracts The oximes 4-carbamoyl-1-[({2-[(E)-(hydroxyimino) methyl] pyridinium-1-yl} methoxy) methyl] pyridinium (known as HI-6) and 3-carbamoyl-1-[({2-[(E)-(hydroxyimino) methyl] pyridinium-1-yl} methoxy) methyl] pyridinium (known as HS-6) are isomers differing from each other only by the position of the carbamoyl group on the pyridine ring. However this slight difference was verified to be responsible for big differences in the percentual of reactivation of acetylcholinesterase (AChE) inhibited by the nerve agents tabun, sarin, cyclosarin and VX...
October 11, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29019246/wearable-ring-based-sensing-platform-for-detecting-chemical-threats
#14
Juliane R Sempionatto, Rupesh K Mishra, Aida Martín, Guangda Tang, Tatsuo Nakagawa, Xiaolong Lu, Alan S Campbell, Kay Mengjia Lyu, Joseph Wang
This work describes a wireless wearable ring-based multiplexed chemical sensor platform for rapid electrochemical monitoring of explosive and nerve-agent threats in vapor and liquid phases. The ring-based sensor system consists of two parts: a set of printed electrochemical sensors and a miniaturized electronic interface, based on a battery-powered stamp-size potentiostat, for signal processing and wireless transmission of data. A wide range of electrochemical capabilities have thus been fully integrated into a 3D printed compact ring structure, toward performing fast square-wave voltammetry and chronoamperometric analyses, along with interchangeable screen-printed sensing electrodes for the rapid detection of different chemical threats...
October 11, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29017758/in-vitro-and-in-vivo-pharmacological-characterization-of-asp8477-a-novel-highly-selective-fatty-acid-amide-hydrolase-inhibitor
#15
Tomonari Watabiki, Noriko Tsuji, Tetsuo Kiso, Tohru Ozawa, Fumie Narazaki, Shuichiro Kakimoto
Although exogenous agonists for cannabinoid (CB) receptors are clinically effective for treating chronic pain, global activation of brain CB receptors causes frequent central nervous system (CNS) side-effects. Fatty acid amide hydrolase (FAAH) is a primary catabolic enzyme for anandamide (AEA), an endogenous CB. Recently, we discovered a novel FAAH inhibitor, 3-pyridyl 4-(phenylcarbamoyl)piperidine-1-carboxylate (ASP8477). In vitro studies demonstrated that ASP8477 inhibited human FAAH-1, FAAH-1 (P129T) and FAAH-2 activity with IC50 values of 3...
October 7, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28993240/the-oximes-hi-6-and-mmb-4-fail-to-reactivate-soman-inhibited-human-and-guinea-pig-ache-a-kinetic-in-vitro-study
#16
Franz Worek, Horst Thiermann, Timo Wille
Acetylcholinesterase (AChE) inhibited by the organophosphorus nerve (OP) agent soman underlies a spontaneous and extremely rapid dealkylation ("aging") reaction which prevents reactivation by oximes. However, in vivo studies in various, soman poisoned animal species showed a therapeutic effect of oximes, with the exact mechanism of this effect remaining still unclear. In order to get more insight and a basis for the extrapolation of animal data to humans, we applied a dynamic in vitro model with continuous online determination of AChE activity...
October 6, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28987189/diseases-of-the-peripheral-nerves
#17
Istvan Katona, Joachim Weis
This chapter reviews the diseases of the peripheral nerves from a neuropathologic point of view, with a special focus on specific morphologic changes, and includes a summary of the histopathologic methods available for their diagnosis. As the rate of obesity and the prevalence of type 2 diabetes increase, diabetic neuropathy is the most common cause of peripheral neuropathy. Many systemic disorders with metabolic origin, like amyloidosis, hepatic failure, vitamin deficiencies, uremia, lipid metabolism disorders, and others, can also cause axonal or myelin alterations in the peripheral nervous system...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28983034/nerve-agents-in-honey
#18
Christopher N Connolly
No abstract text is available yet for this article.
October 6, 2017: Science
https://www.readbyqxmd.com/read/28978804/purinergic-dysregulation-causes-hypertensive-glaucoma-like-optic-neuropathy
#19
Youichi Shinozaki, Kenji Kashiwagi, Kazuhiko Namekata, Akiko Takeda, Nobuhiko Ohno, Bernard Robaye, Takayuki Harada, Takeshi Iwata, Schuichi Koizumi
Glaucoma is an optic neuropathy characterized by progressive degeneration of retinal ganglion cells (RGCs) and visual loss. Although one of the highest risk factors for glaucoma is elevated intraocular pressure (IOP) and reduction in IOP is the only proven treatment, the mechanism of IOP regulation is poorly understood. We report that the P2Y6 receptor is critical for lowering IOP and that ablation of the P2Y6 gene in mice (P2Y6KO) results in hypertensive glaucoma-like optic neuropathy. Topically applied uridine diphosphate, an endogenous selective agonist for the P2Y6 receptor, decreases IOP...
October 5, 2017: JCI Insight
https://www.readbyqxmd.com/read/28975934/assembly-of-the-active-center-of-organophosphorus-hydrolase-in-metal-organic-frameworks-via-rational-combination-of-functional-ligands
#20
Mengfan Xia, Caixia Zhuo, Xuejuan Ma, Xiaohong Zhang, Huaming Sun, Quanguo Zhai, Yaodong Zhang
Different from popular mimics of bimetallic nuclear centers bridged by a hydroxide, a total coordination sphere of the active center of organophosphorus hydrolase was assembled in metal-organic frameworks by rational design and combination of ligands, which resulted in efficient destruction of nerve agent stimulants without a base as a co-catalyst.
October 12, 2017: Chemical Communications: Chem Comm
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