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https://www.readbyqxmd.com/read/28823084/effects-of-a-novel-tungsten-impregnated-rubber-neck-shield-on-the-quality-of-cerebral-images-acquired-using-15-o-labeled-gas
#1
Kei Wagatsuma, Keiichi Oda, Kenta Miwa, Motoki Inaji, Muneyuki Sakata, Jun Toyohara, Kiichi Ishiwata, Masayuki Sasaki, Kenji Ishii
The present study aimed to validate the effects of a novel tungsten-impregnated rubber neck shield on the quality of phantom and clinical (15)O-labeled gas positron emission tomography (PET) images. Images were acquired in the presence or absence of a neck shield from a cylindrical phantom containing [(15)O]H2O (phantom study) and from three individuals using [(15)O]CO2, [(15)O]O2 and [(15)O]CO gas (clinical study). Data were acquired in three-dimensional (3D) mode using a Discovery PET/CT 710. Values for cerebral blood flow, cerebral blood volume, oxygen extraction fraction, and cerebral metabolic rate of oxygen with and without the neck shield were calculated from (15)O-labeled gas images...
August 19, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28822252/removal-of-gadolinium-a-neutron-poison-from-the-moderator-system-of-nuclear-reactors
#2
A L Rufus, Padma S Kumar, K Jeena, S Velmurugan
Gadolinium as gadolinium nitrate is used as neutron poison in the moderator system for regulating and controlling the power generation of Pressurized Heavy Water Reactors (PHWR) and proposed to be used in Advanced Heavy Water Reactors (AHWR) owing to its high neutron absorption cross section. Removal of the added gadolinium nitrate (Gd(3+) and NO3(-)) from the system after its intended use is done using ion exchange resins. In the present investigation, attempts have been made to optimize the ion exchange process for generation of low radioactive waste and maximize utilization of the ion exchange resins by employing different types of resins and different modes of operation...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822134/genome-scale-modeling-of-photorespiratory-pathway-manipulation
#3
Anika Küken, Zoran Nikoloski
Quantifying the redistribution of metabolic reaction fluxes under experimental scenarios that affect the photorespiratory pathway can provide insights about the coupling of this pathway with other parts of metabolism. However, differential flux profiling on a genome-scale level remains the biggest challenge in modern systems biology. Here we present a protocol for applying a constraint-based approach, termed iReMet-Flux, that integrates data about relative metabolite levels in a stoichiometric metabolic model to predict differential fluxes at a genome-scale level under mild modeling assumptions...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28822101/revisiting-the-logan-plot-to-account-for-non-negligible-blood-volume-in-brain-tissue
#4
Martin Schain, Patrik Fazio, Ladislav Mrzljak, Nahid Amini, Nabil Al-Tawil, Cheryl Fitzer-Attas, Juliana Bronzova, Bernhard Landwehrmeyer, Christina Sampaio, Christer Halldin, Andrea Varrone
BACKGROUND: Reference tissue-based quantification of brain PET data does not typically include correction for signal originating from blood vessels, which is known to result in biased outcome measures. The bias extent depends on the amount of radioactivity in the blood vessels. In this study, we seek to revisit the well-established Logan plot and derive alternative formulations that provide estimation of distribution volume ratios (DVRs) that are corrected for the signal originating from the vasculature...
August 18, 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28821709/assessment-of-the-announced-north-korean-nuclear-test-using-long-range-atmospheric-transport-and-dispersion-modelling
#5
Pieter De Meutter, Johan Camps, Andy Delcloo, Piet Termonia
On 6 January 2016, the Democratic People's Republic of Korea announced to have conducted its fourth nuclear test. Analysis of the corresponding seismic waves from the Punggye-ri nuclear test site showed indeed that an underground man-made explosion took place, although the nuclear origin of the explosion needs confirmation. Seven weeks after the announced nuclear test, radioactive xenon was observed in Japan by a noble gas measurement station of the International Monitoring System. In this paper, atmospheric transport modelling is used to show that the measured radioactive xenon is compatible with a delayed release from the Punggye-ri nuclear test site...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821486/delayed-risk-stratification-system-in-pt1an0-nx-dtc-patients-treated-without-radioactive-iodine
#6
Danuta Gąsior-Perczak, Iwona Pałyga, Monika Szymonek, Artur Kowalik, Agnieszka Walczyk, Janusz Kopczyński, Katarzyna Lizis-Kolus, Anna Słuszniak, Janusz Słuszniak, Tomasz Łopatyński, Ryszard Mezyk, Stanisław Góźdź, Aldona Kowalska
PURPOSE: A delayed risk stratification (DRS) system by Momesso et al. was accepted by the American Thyroid Association as a diagnostic tool for the risk stratification of unfavorable clinical outcomes and to monitor the clinical outcomes of differentiated thyroid cancer (DTC) patients treated without radioactive iodine (RAI). The aim of this study was to evaluate the DRS system in patients with pT1aN0/Nx stage . METHODS: The study included 304 low-risk patients after thyroidectomy (n=202) or lobectomy (n=102) without RAI and were treated at a single center...
August 18, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28821003/-111-in-dtpa-d-phe-1-asp-0-d-phe-1-octreotide-exhibits-higher-tumor-accumulation-and-lower-renal-radioactivity-than-111-in-dtpa-d-phe-1-octreotide
#7
Nobuhiro Oshima, Hiromichi Akizawa, Hirotake Kitaura, Hidekazu Kawashima, Songji Zhao, Yan Zhao, Ken-Ichi Nishijima, Yoji Kitamura, Yasushi Arano, Yuji Kuge, Kazue Ohkura
INTRODUCTION: (111)In-DTPA-d-Phe(1)-octreotide scintigraphy is an important method of detecting neuroendocrine tumors. We previously reported that a new derivative of (111)In-DTPA-d-Phe(1)-octreotide, (111)In-DTPA-d-Phe(-1)-Asp(0)-d-Phe(1)-octreotide, accomplished the reduction of prolonged renal accumulation of radioactivity. The aim of this study was to evaluate the tumor accumulation of (111)In-DTPA-d-Phe(-1)-Asp(0)-d-Phe(1)-octreotide in vitro and in vivo by comparing it with (111)In-DTPA-d-Phe(1)-octreotide...
July 12, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28819816/a-new-non-radioactive-deoxyhypusine-synthase-assay-adaptable-to-high-throughput-screening
#8
Myung Hee Park, Ajeet Mandal, Swati Mandal, Edith C Wolff
Deoxyhypusine synthase (DHS) catalyzes the post-translational modification of eukaryotic translation factor 5A (eIF5A) by the polyamine, spermidine, that converts one specific lysine residue to deoxyhypusine [N (ε) -4-aminobutyl(lysine)], which is subsequently hydroxylated to hypusine [N (ε) -4-amino-2-hydroxybutyl(lysine)]. Hypusine synthesis represents the most critical function of polyamine. As eIF5A has been implicated in various human diseases, identification of specific inhibitors of hypusine modification is of vital importance...
August 17, 2017: Amino Acids
https://www.readbyqxmd.com/read/28818716/positron-emission-tomography-pet-imaging-of-nicotine-induced-dopamine-release-in-squirrel-monkeys-using-18-f-fallypride
#9
Jennifer E Naylor, Takato Hiranita, Katelin S Matazel, Xuan Zhang, Merle G Paule, Amy K Goodwin
BACKGROUND: Nicotine, the principal psychoactive tobacco constituent, is thought to produce its reinforcing effects via actions within the mesolimbic dopamine (DA) system. The objective of the current study was to examine the effect of nicotine on DA D2/D3 receptor availability in the nonhuman primate brain with the use of the radioligand [(18)F]fallypride and positron emission tomography (PET). METHODS: Ten adult male squirrel monkeys were used in the current study...
August 8, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28818645/improved-performance-comparisons-of-radioxenon-systems-for-low-level-releases-in-nuclear-explosion-monitoring
#10
Derek A Haas, Paul W Eslinger, Theodore W Bowyer, Ian M Cameron, James C Hayes, Justin D Lowrey, Harry S Miley
The Comprehensive Nuclear-Test-Ban Treaty bans all nuclear tests and mandates development of verification measures to detect treaty violations. One verification measure is detection of radioactive xenon isotopes produced in the fission of actinides. The International Monitoring System (IMS) currently deploys automated radioxenon systems that can detect four radioxenon isotopes. Radioxenon systems with lower detection limits are currently in development. Historically, the sensitivity of radioxenon systems was measured by the minimum detectable concentration for each isotope...
August 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28818531/the-position-of-fluorine-in-cp-118-954-affects-ache-inhibition-potency-and-pet-imaging-quantification-for-ache-expression-in-the-rat-brain
#11
Byung Chul Lee, Byung Seok Moon, Hyun Soo Park, Jae Ho Jung, Hyun Sik Park, Do Dam Park, Modesto de Candia, Nunzio Denora, Cosimo D Altomare, Sang Eun Kim
The in vitro inhibition potency against acetylcholinesterase (AChE) of fluorinated derivatives of CP-118,954 (1) has been shown to depend upon the position of aromatic fluorine (F) substitution on the N-benzyl moiety. Indeed, the meta-F-substituted compound 3 (IC50=1.4nM) shows similar potency with the parent compound 1 (IC50=1.2nM), whereas the ortho-F derivative 2 (IC50=3.2nM) and para-F derivative 4 (IC50=10.8nM) were found to be less potent AChE inhibitors. A comparative in vivo microdialysis study in rats showed that 3 has the strongest effect on the neuropharmacological properties as AChE inhibitor...
August 15, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28818311/characterization-of-the-flow-cytometric-assay-for-ex%C3%A2-vivo-monitoring-of-cytotoxicity-mediated-by-antigen-specific-cytotoxic-t-lymphocytes
#12
Akira Takagi, Yutaka Horiuchi, Masanori Matsui
Several non-radioactive methods have widely been utilized to detect antigen-specific cytotoxic T lymphocyte (CTL) responses instead of the classical (51)Cr-release assay. These methods include intracellular cytokine staining, major histocompatibility complex-class I tetramers, and the CD107a mobilization assay. However, they do not directly measure target-cell death. In contrast, several attempts have been made to develop the flow cytometric CTL (FC-CTL) assay for evaluation of cytotoxicity. However, further improvement is necessary for it to become standardized...
August 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28817670/synthesis-radiosynthesis-and-in-vitro-evaluation-of-18f-bodipy-c16-triglyceride-as-a-dual-modal-imaging-agent-for-brown-adipose-tissue
#13
Andreas Paulus, Marco Maenen, Natascha Drude, Emmani B M Nascimento, Wouter D van Marken Lichtenbelt, Felix M Mottaghy, Matthias Bauwens
BACKGROUND: Brown adipose tissue research is in the focus in the field of endocrinology. We designed a dual-modal fluorescent/PET fatty acid based tracer on commercially available Bodipy-C16, which can be synthesized to its corresponding triglyceride and which combines the benefits of fluorescent and PET imaging. METHODS: Bodipy-C16 was coupled to 1,3-diolein resulting in Bodipy-triglyceride. Bodipy-C16 and Bodipy-triglyceride compounds were radiolabeled with 18F using an 18F/19F exchange reaction to yield a dual-modal imaging molecule...
2017: PloS One
https://www.readbyqxmd.com/read/28816536/optimizing-lenvatinib-therapy-in-patients-with-metastatic-radioactive-iodine-resistant-differentiated-thyroid-cancers
#14
Sina Jasim, Nicole M Iniguez-Ariza, Crystal R Hilger, Ashish V Chintakuntlawar, Mabel M Ryder, John C Morris, Keith C Bible
BACKGROUND AND OBJECTIVES: Lenvatinib is approved for use in advanced radioactive iodine resistant differentiated thyroid cancers (RAIR-DTCs); its efficacy is indisputable, but toxicities are great, creating daunting challenges for patients and providers. Few data regarding early adverse events and impact on quality of life (QOL) exist; we sought to add clarity to these issues by analyzing our initial post-approval lenvatinib experience. METHODS: Standardized patient education was implemented, providing detailed instructions and expert provider contacts to facilitate timely reporting of toxicities and guide responsive actions...
August 17, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28816214/synchronous-malignancies-of-thyroglossal-duct-cyst-and-thyroid-gland
#15
Chinna Naik, Sandip Basu
Malignant involvement of thyroglossal duct cyst is rare, still rarer is the synchronous malignant involvement of the thyroid gland. Although the Sistrunk procedure is often regarded as adequate, controversy exists of the need for an additional total thyroidectomy and radioiodine ablative therapy, the decision of which depends upon the presence of (i) suspicious thyroid gland nodule; (ii) presence of lymphadenopathy; or (iii) a previous history of neck irradiation. We report a 47-year-old woman diagnosed with papillary carcinoma within a recurrent thyroglossal duct cyst with infiltration into surrounding soft tissues and a suspicious thyroid nodule of the left thyroid lobe with no regional lymph node involvement...
March 2017: National Medical Journal of India
https://www.readbyqxmd.com/read/28815804/octadentate-picolinic-acid-based-bispidine-ligand-for-radiometal-ions
#16
Peter Comba, Una Jermilova, Chris Orvig, Brian O Patrick, Caterina F Ramogida, Katharina Rück, Christina Schneider, Miriam Starke
The synthesis of the octadentate bispidine ligand H2bispa2 bearing two picolinic acid pendant arms and its coordination chemistry with metal ions with radionuclides relevant for nuclear medicine, i.e. indium(III) (111In), lutetium(III) (177Lu) and lanthanum(III) (as surrogate for 225Ac), are reported. The non-radioactive metal complexes of the N6O2-type bispa ligand were characterized by 1H and 13C nuclear magnetic resonance spectroscopy, elemental analysis, mass spectrometry and single crystal X-ray analysis...
August 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28815446/a-human-pet-study-of-11-c-hms011-a-potential-radioligand-for-ampa-receptors
#17
Keisuke Takahata, Yasuyuki Kimura, Chie Seki, Masaki Tokunaga, Masanori Ichise, Kazunori Kawamura, Maiko Ono, Soichiro Kitamura, Manabu Kubota, Sho Moriguchi, Tatsuya Ishii, Yuhei Takado, Fumitoshi Niwa, Hironobu Endo, Tomohisa Nagashima, Yoko Ikoma, Ming-Rong Zhang, Tetsuya Suhara, Makoto Higuchi
BACKGROUND: α-Amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) receptor is a primary mediator of fast glutamatergic excitatory signaling in the brain and has been implicated in diverse neuropsychiatric diseases. We recently developed a novel positron emission tomography (PET) ligand, 2-(1-(3-([(11)C]methylamino)phenyl)-2-oxo-5-(pyrimidin-2-yl)-1,2-dihydropyridin-3-yl) benzonitrile ([(11)C]HMS011). This compound is a radiolabelled derivative of perampanel, an antiepileptic drug acting on AMPA receptors, and was demonstrated to have promising in vivo properties in the rat and monkey brains...
August 16, 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28815414/comparison-of-image-quality-between-step-and-shoot-and-continuous-bed-motion-techniques-in-whole-body-18-f-fluorodeoxyglucose-positron-emission-tomography-with-the-same-acquisition-duration
#18
Shozo Yamashita, Haruki Yamamoto, Tetsu Nakaichi, Tatsuya Yoneyama, Kunihiko Yokoyama
OBJECTIVE: This study aimed to compare the qualities of whole-body positron emission tomography (PET) images acquired by the step-and-shoot (SS) and continuous bed motion (CBM) techniques with approximately the same acquisition duration, through phantom and clinical studies. METHODS: A body phantom with 10-37 mm spheres was filled with (18)F-fluorodeoxyglucose (FDG) solution at a sphere-to-background radioactivity ratio of 4:1 and acquired by both techniques. Reconstructed images were evaluated by visual assessment, percentages of contrast (%Q H) and background variability (%N) in accordance with the Japanese guideline for oncology FDG-PET/computed tomography (CT)...
August 16, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28813596/molecular-imaging-of-p-glycoprotein-in-chemoresistant-tumors-using-a-dual-modality-pet-fluorescence-probe
#19
Mengzhe Wang, Chengqiong Mao, Hui Wang, Xueying Ling, Zhanhong Wu, Zi-Bo Li, Xin Ming
Overexpression of P-glycoprotein (Pgp) has been considered a primary cause for multidrug resistance in a variety of cancers for three decades. However, clinical translation of Pgp targeted therapeutics has been hindered by lack of patient preselection based on the Pgp presence in tumors. We aim to develop a molecularly targeted probe for imaging tumoral Pgp in vivo with positron emission tomography (PET) and fluorescence, and to provide a tool for preselecting the patients with tumoral Pgp expression. Thus, a Pgp monoclonal antibody 15D3 was chemically modified with IRDye800 (IR800) and DOTA chelator...
August 16, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28813020/nine-new-triterpene-glycosides-magnumosides-a%C3%A2-a%C3%A2-b%C3%A2-b%C3%A2-c%C3%A2-c%C3%A2-and-c%C3%A2-from-the-vietnamese-sea-cucumber-neothyonidium-massinium-magnum-structures-and-activities-against-tumor-cells-independently-and-in-synergy-with-radioactive-irradiation
#20
Alexandra S Silchenko, Anatoly I Kalinovsky, Sergey A Avilov, Vladimir I Kalinin, Pelageya V Andrijaschenko, Pavel S Dmitrenok, Ekaterina A Chingizova, Svetlana P Ermakova, Olesya S Malyarenko, Tatyana N Dautova
Nine new sulfated triterpene glycosides, magnumosides A₁ (1), A₂ (2), A₃ (3), A₄ (4), B₁ (5), B₂ (6), C₁ (7), C₂ (8) and C₄ (9) as well as a known colochiroside B₂ (10) have been isolated from the tropical Indo-West Pacific sea cucumber Neothynidium (=Massinium) magnum (Phyllophoridae, Dendrochirotida) collected in the Vietnamese shallow waters. The structures of new glycosides were elucidated by 2D NMR spectroscopy and mass-spectrometry. All the isolated new glycosides were characterized by the non-holostane type lanostane aglycones having 18(16)-lactone and 7(8)-double bond and differed from each other by the side chains and carbohydrate moieties structures...
August 16, 2017: Marine Drugs
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