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https://www.readbyqxmd.com/read/28345174/overall-evaluability-of-low-dose-protocol-for-computed-tomography-angiography-of-thoracic-aorta-using-80%C3%A2-kv-and-iterative-reconstruction-algorithm-using-different-concentration-contrast-media
#1
Andrea Daniele Annoni, Maria E Mancini, Daniele Andreini, Alberto Formenti, Saima Mushtaq, Enrica Nobili, Marco Guglielmo, Andrea Baggiano, Edoardo Conte, Mauro Pepi
INTRODUCTION: Multidetector Computed Tomography Angiography (MDCTA) is presently the imaging modality of choice for aortic disease. However, the effective radiation dose and the risk related to the use of contrast agents associated with MDCTA is an issue of concern. Aim of this study was to assess image quality of a low dose ECG-gated MDCTA of thoracic aorta using different concentration contrast media without tailored injection protocol. METHODS: Two-hundred patients were randomised into four different scan protocols: Group A (Iodixanol 320 and 80 Kvp tube voltage), Group B (Iodixanol 320 and 100 Kvp tube voltage), Group C (Iomeprol 400 and 80 Kvp tube voltage) and Group D (Iomeprol 400 and 100 Kvp tube voltage)...
March 27, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28335309/separation-of-bacteria-protozoa-and-carbon-nanotubes-by-density-gradient-centrifugation
#2
Monika Mortimer, Elijah J Petersen, Bruce A Buchholz, Patricia A Holden
Sustainable production and use of carbon nanotube (CNT)-enabled materials require efficient assessment of CNT environmental hazards, including the potential for CNT bioaccumulation and biomagnification in environmental receptors. Microbes, as abundant organisms responsible for nutrient cycling in soil and water, are important ecological receptors for studying the effects of CNTs. Quantification of CNT association with microbial cells requires efficient separation of CNT-associated cells from individually dispersed CNTs and CNT agglomerates...
October 12, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28302486/mitochondria-are-devoid-of-amyloid-%C3%AE-protein-a%C3%AE-producing-secretases-evidence-for-unlikely-occurrence-within-mitochondria-of-a%C3%AE-generation-from-amyloid-precursor-protein
#3
Naomi Mamada, Daisuke Tanokashira, Kazuhiro Ishii, Akira Tamaoka, Wataru Araki
Mitochondrial dysfunction is implicated in the pathological mechanism of Alzheimer's disease (AD). Amyloid β-protein (Aβ), which plays a central role in AD pathogenesis, is reported to accumulate within mitochondria. However, a question remains as to whether Aβ is generated locally from amyloid precursor protein (APP) within mitochondria. We investigated this issue by analyzing the expression patterns of APP, APP-processing secretases, and APP metabolites in mitochondria separated from human neuroblastoma SH-SY5Y cells and those expressing Swedish mutant APP...
March 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28267987/prospective-ecg-triggering-cardiac-ct-for-infants-with-complex-congenital-heart-disease-using-low-dose-contrast-medium-low-tube-voltage-and-adaptive-statistical-iterative-reconstruction
#4
S-Y Wang, W Gao, Y-M Zhong, A-M Sun, Q Wang, L-W Hu, H-S Qiu, J-Y Li
AIM: To demonstrate the clinical value of prospective electrocardiography (ECG)-triggered cardiac computed tomography (CT) with low concentration contrast medium, low tube voltage, and adaptive statistic iterative reconstruction (ASIR) to reduce both radiation and contrast dose in examining infants with complex congenital heart disease (CHD). MATERIALS AND METHODS: Forty-four consecutive infants (19 male, 25 female, age: 8.06±4.33 months, weight: 7.31±1.36 kg) with complex CHD underwent prospective ECG-triggered low-dose cardiac CT using 80 kVp and 120 mA...
March 4, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28248433/application-of-bold-mri-and-dti-for-the-evaluation-of-renal-effect-related-to-viscosity-of-iodinated-contrast-agent-in-a-rat-model
#5
Yi Wang, Ke Ren, Yi Liu, Wen-Ge Sun, Jia-Huan Wang, Xin Zhang, Cheng-Hua Wu
PURPOSE: To evaluate the effects of viscosity of contrast agent (CA) on intrarenal oxygenation and diffusion as measured by blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) in a rat model. MATERIALS AND METHODS: Radiocontrast iodixanol formulated in three viscosities were designated 270, 320, and 350 (mg iodine/mL). Sixty-three male Wistar rats were divided into four groups. Saline and iodixanol (4 g iodine/kg) were administered...
March 1, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28240640/comparison-of-270-versus-320-mg-i-ml-of-iodixanol-in-1-image-assessment-of-both-renal-arteries-and-veins-with-dual-energy-spectral-ct-imaging-in-late-arterial-phase-and-their-influence-on-renal-function
#6
Kefeng Zhou, Jian He, Feng Qu, Haijian Fan, Yi Ma, Tingting Shi, Zhengyang Zhou, Bin Zhu
OBJECTIVE: The objective of this study was to compare the image quality of renal arteries and veins with dual-energy spectral computed tomography (CT) imaging in late arterial phase using 270 and 320 mg I/mL of iodixanol and their influence on renal function. METHODS: A total of 1062 patients underwent renal CT angiography with 270 or 320 mg I/mL of iodixanol with dual-energy spectral CT imaging in late arterial phase. Image quality and their influence on renal function were compared...
February 24, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28236133/subjective-and-objective-image-differences-in-pediatric-computed-tomography-cardiac-angiography-using-lower-iodine-concentration
#7
Jae-Yeon Hwang, Ki Seok Choo, Yoon Young Choi, Jin Hyeok Kim, Hwaseong Ryu, Junhee Han, Yong-Woo Kim, Ung Bae Jeon, Kyung Jin Nam
BACKGROUND: Several recent studies showed the optimal contrast enhancement with a low-concentration and iso-osmolar contrast media in both adult and pediatric patients. However, low contrast media concentrations are not routinely used due to concerns of suboptimal enhancement of cardiac structures and small vessels. OBJECTIVE: To evaluate the feasibility of using iso-osmolar contrast media containing a low iodine dose for CT cardiac angiography at 80 kilovolts (kVp) in neonates and infants...
February 24, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28205172/measurement-of-cholesterol-transfer-from-lysosome-to-peroxisome-using-an-in-vitro-reconstitution-assay
#8
Jie Luo, Ya-Cheng Liao, Jian Xiao, Bao-Liang Song
Low-density lipoproteins (LDLs) are taken up by the cell mainly through receptor-mediated endocytosis. LDL-derived cholesterol leaves lysosome and further transports to downstream organelles for specific cellular needs. We recently report that cholesterol transfers from lysosome to peroxisome through lysosome-peroxisome membrane contact (LPMC). Here, we use iodixanol density gradient centrifugation to isolate lysosomes and peroxisomes separately for the in vitro reconstitution of LPMC. We also apply (3)H-cholesterol-labeled lysosomes and peroxisomes in vitro to measure (3)H-cholesterol transfer through LPMC...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28177193/manufacturing-of-recombinant-adeno-associated-viruses-using-mammalian-expression-platforms
#9
REVIEW
Marc-André Robert, Parminder S Chahal, Alexandre Audy, Amine Kamen, Rénald Gilbert, Bruno Gaillet
Manufacturing practices for recombinant adeno-associated viruses (AAV) have improved in the last decade through the development of new platforms in conjunction with better production and purification methods. In this review, we discuss the advantages and limitations of the most popular systems and methods employed with mammalian cell platforms. Methods and systems such as transient transfection, packaging and producer cells and adenovirus and herpes simplex virus are described. In terms of best production yields, they are comparable with about 10(4) -10(5) vector genomes produced per cell but transient transfection of HEK293 cells is by far the most commonly used...
February 8, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28152568/apolipoprotein-a-inhibits-hepatitis-c-virus-entry-through-interaction-with-infectious-particles
#10
Catarina Oliveira, Carole Fournier, Véronique Descamps, Virginie Morel, Corey A Scipione, Rocco Romagnuolo, Marlys L Koschinsky, Agnès Boullier, Paulo Marcelo, Jean-Marc Domon, Etienne Brochot, Gilles Duverlie, Catherine Francois, Sandrine Castelain, Francois Helle
The development of different cell culture models has greatly contributed to improve the knowledge of the hepatitis C virus (HCV) life cycle. However, it is still challenging to grow HCV clinical isolates in cell culture. This would open new perspectives to study HCV biology, including drug resistant variants emerging with new antiviral therapies. In this study we hypothesized that this hurdle could be due to the presence of inhibitory factors in patient serum. Combining polyethylene glycol precipitation, iodixanol gradient and size-exclusion chromatography, we obtained a purified fraction enriched in inhibitory factors from HCV seronegative sera...
February 2, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28063646/solute-transport-at-the-interface-of-cartilage-and-subchondral-bone-plate-effect-of-micro-architecture
#11
Behdad Pouran, Vahid Arbabi, Ronald Law Bleys, P René van Weeren, Amir A Zadpoor, Harrie Weinans
Cross-talk of subchondral bone and articular cartilage could be an important aspect in the etiology of osteoarthritis. Previous research has provided some evidence of transport of small molecules (~370Da) through the calcified cartilage and subchondral bone plate in murine osteoarthritis models. The current study, for the first time, uses a neutral diffusing computed tomography (CT) contrast agent (iodixanol, ~1550Da) to study the permeability of the osteochondral interface in equine and human samples. Sequential CT monitoring of diffusion after injecting a finite amount of contrast agent solution onto the cartilage surface using a micro-CT showed penetration of the contrast molecules across the cartilage-bone interface...
February 8, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28045670/randomized-double-blind-study-comparing-patient-comfort-and-safety-between-iodixanol-320-mg-i-ml-and-iopamidol-370-mg-i-ml-in-patients-undergoing-peripheral-arteriography-the-comfort-ii-trial
#12
Christian Rosenberg, José Joaquín Martínez-Rodrigo, Elena Lonjedo Vicent, Juan Macho, Lauren Lim, Thomas M Todoran
BACKGROUND: Numerous clinical trials conducted 10-20 years ago evaluated contrast-induced discomfort. It is unknown whether those data are applicable to current-day clinical practice. This study was performed to provide contemporary contrast-induced patient discomfort data obtained during peripheral arteriography procedures using iso-osmolar iodixanol 320 mg I/mL, compared to low-osmolar iopamidol 370 mg I/mL. METHODS AND RESULTS: Patients receiving iodixanol or iopamidol reported discomfort (heat, coldness, or pain) using a 10-point scale, which was converted to intensity categories: 0 = none; 1-3 = mild; 4-7 = moderate; and 8-10 = severe...
2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/27935551/organotypic-soft-tissue-co-cultures-morphological-changes-in-microvascular-endothelial-tubes-after-incubation-with%C3%A2-iodinated-contrast-media
#13
S Kaessmeyer, J Sehl, M Khiao In, B Hiebl, R Merle, F Jung, R P Franke, J Plendl
INTRODUCTION: Clinical complications like thrombosis or anaphylaxis have been described to go along with the intra-venous or intra-arterial injection of iodinated contrast media (CM). It has been suggested that the administration of CM affects rheological parameters and thereby causes reduced blood velocity in microvessels. In vitro studies revealed significant buckling of endothelial cells after exposure to CM reducing the lumen of vessels. The aim of this study was to test the influence of CM on three-dimensional microvascular tubules with open lumina within an organotypic soft-tissue co-culture assay in vitro...
2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27917301/separation-of-bacteria-protozoa-and-carbon-nanotubes-by-density-gradient-centrifugation
#14
Monika Mortimer, Elijah J Petersen, Bruce A Buchholz, Patricia A Holden
Sustainable production and use of carbon nanotube (CNT)-enabled materials require efficient assessment of CNT environmental hazards, including the potential for CNT bioaccumulation and biomagnification in environmental receptors. Microbes, as abundant organisms responsible for nutrient cycling in soil and water, are important ecological receptors for studying the effects of CNTs. Quantification of CNT association with microbial cells requires efficient separation of CNT-associated cells from individually dispersed CNTs and CNT agglomerates...
2016: Nanomaterials
https://www.readbyqxmd.com/read/27910043/production-and-characterization-of-vectors-based-on-the-cardiotropic-aav-serotype-9
#15
Erik Kohlbrenner, Thomas Weber
Vectors based on adeno-associated virus serotype 9 (AAV9) efficiently transduce cardiomyocytes in both rodents and large animal models upon either systemic or regional vector delivery. In this chapter, we describe the most widely used production and purification method of AAV9. This production approach does not depend on the use of a helpervirus but instead on transient transfection of HEK293T cells with a plasmid containing the recombinant AAV genome and a second plasmid encoding the AAV9 capsid proteins, the AAV Rep proteins and the adenoviral helper functions...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27910039/silencing-genes-in-the-heart
#16
Henry Fechner, Roland Vetter, Jens Kurreck, Wolfgang Poller
Silencing of cardiac genes by RNA interference (RNAi) has developed into a powerful new method to treat cardiac diseases. Small interfering (si)RNAs are the inducers of RNAi, but cultured primary cardiomyocytes and heart are highly resistant to siRNA transfection. This can be overcome by delivery of small hairpin (sh)RNAs or artificial microRNA (amiRNAs) by cardiotropic adeno-associated virus (AAV) vectors. Here we describe as example of the silencing of a cardiac gene, the generation and cloning of shRNA, and amiRNAs directed against the cardiac protein phospholamban...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27899518/variable-mr-and-pathologic-patterns-of-hemorrhage-after-iodinated-contrast-infusion-in-mca-occlusion-reperfusion-model
#17
Humberto Morales, Aigang Lu, Yuko Kurosawa, Joseph F Clark, Thomas Tomsick
OBJECTIVE: To examine the hypothesis that IA reperfusion with iso-osmolar iodixanol, low-osmolar iopamidol, or saline causes different effects on MR signal changes and pathologic cut-brain section related to hemorrhagic transformation (HT) or iodinated radiographic contrast media (IRCM) deposition. METHODS: Infarct was induced in 30 rats by middle cerebral artery suture occlusion. Reperfusion was performed after 5 hours with iso-osmolar iodixanol (n=9), low-osmolar iopamidol (n=12) or saline (n=9)...
November 29, 2016: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/27775612/cutthroat-trout-virus-towards-a-virus-model-to-support-hepatitis-e-research
#18
Marcus von Nordheim, Michel Boinay, Remo Leisi, Christoph Kempf, Carlos Ros
Cutthroat trout virus (CTV) is a non-pathogenic fish virus belonging to the Hepeviridae family, and it is distantly related to hepatitis E virus (HEV). Here, we report the development of an efficient cell culture system where CTV can consistently replicate to titers never observed before with a hepevirus. By using the rainbow trout gill (RTGill-W1) cell line, CTV reaches 10(10) geq/mL intracellularly and 10⁸ geq/mL extracellularly within 5-6 days in culture. We additionally established a qPCR system to investigate CTV infectivity, and developed a specific antibody directed against the viral capsid protein encoded by ORF2...
October 20, 2016: Viruses
https://www.readbyqxmd.com/read/27720635/isolated-effects-of-external-bath-osmolality-solute-concentration-and-electrical-charge-on-solute-transport-across-articular-cartilage
#19
Behdad Pouran, Vahid Arbabi, Amir A Zadpoor, Harrie Weinans
The metabolic function of cartilage primarily depends on transport of solutes through diffusion mechanism. In the current study, we use contrast enhanced micro-computed tomography to determine equilibrium concentration of solutes through different cartilage zones and solute flux in the cartilage, using osteochondral plugs from equine femoral condyles. Diffusion experiments were performed with two solutes of different charge and approximately equal molecular weight, namely iodixanol (neutral) and ioxaglate (charge=-1) in order to isolate the effects of solute's charge on diffusion...
October 6, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27700101/layer-by-layer-sorting-of-rhenium-disulfide-via-high-density-isopycnic-density-gradient-ultracentrifugation
#20
Joohoon Kang, Vinod K Sangwan, Joshua D Wood, Xiaolong Liu, Itamar Balla, David Lam, Mark C Hersam
Isopycnic density gradient ultracentrifugation (iDGU) has been widely applied to sort nanomaterials by their physical and electronic structure. However, the commonly used density-gradient medium iodixanol has a finite maximum buoyant density that prevents the use of iDGU for high-density nanomaterials. Here, we overcome this limit by adding cesium chloride (CsCl) to iodixanol, thus increasing its maximum buoyant density to the point where the high-density two-dimensional nanomaterial rhenium disulfide (ReS2) can be sorted in a layer-by-layer manner with iDGU...
November 9, 2016: Nano Letters
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