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https://www.readbyqxmd.com/read/29353431/sensitive-electrochemical-detection-of-microrna-21-based-on-propylamine-functionalized-mesoporous-silica-with-glucometer-readout
#1
Kun Deng, Yong Zhang, Xuedong Tong
A new homogeneous electrochemical sensing system was developed for sensitive detection of microRNA-21 (miRNA-21) based on target-induced glucose release from propylamine-functionalized mesoporous silica nanoparticle (MSN) with glucometer readout. Glucose molecules (as the signal tracers) were initially gated into the pores through the interaction of the negatively charged anchor DNA with the aminated MSN. Upon addition of target miRNA, the analyte competitively hybridized with anchor DNA to form the RNA-DNA duplex, thus resulting in detachment of anchor DNA from the MSN accompanying the pore opening...
January 20, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29351846/dual-strategies-for-argonaute2-mediated-biogenesis-of-erythroid-mirnas-underlie-conserved-requirements-for-slicing-in-mammals
#2
David Jee, Jr-Shiuan Yang, Sun-Mi Park, D'Juan T Farmer, Jiayu Wen, Timothy Chou, Arthur Chow, Michael T McManus, Michael G Kharas, Eric C Lai
While Slicer activity of Argonaute is central to RNAi, conserved roles of slicing in endogenous regulatory biology are less clear, especially in mammals. Biogenesis of erythroid Dicer-independent mir-451 involves Ago2 catalysis, but mir-451-KO mice do not phenocopy Ago2 catalytic-dead (Ago2-CD) mice, suggesting other needs for slicing. Here, we reveal mir-486 as another dominant erythroid miRNA with atypical biogenesis. While it is Dicer dependent, it requires slicing to eliminate its star strand. Thus, in Ago2-CD conditions, miR-486-5p is functionally inactive due to duplex arrest...
January 18, 2018: Molecular Cell
https://www.readbyqxmd.com/read/29349425/assessment-of-lower-extremity-ischemia-using-smartphone-thermographic-imaging
#3
Peter H Lin, Marius Saines
Conventional diagnostic modalities for assessing arterial circulation or tissue perfusion include blood pressure measurement, ultrasound evaluation, and contrast-based angiographic assessment. An infrared thermal camera can detect infrared radiation energy from the human body, which generates a thermographic image to allow tissue perfusion analysis. We describe a smartphone-based miniature thermal imaging system that can be used as an adjunctive imaging modality to assess tissue perfusion. This smartphone-based camera device is noninvasive, simple to use, and cost-effective in assessing patients with lower extremity tissue perfusion...
December 2017: Journal of Vascular Surgery Cases and Innovative Techniques
https://www.readbyqxmd.com/read/29345638/molecular-mechanism-of-promoter-opening-by-rna-polymerase-iii
#4
Matthias K Vorländer, Heena Khatter, Rene Wetzel, Wim J H Hagen, Christoph W Müller
RNA polymerase III (Pol III) and transcription factor IIIB (TFIIIB) assemble together on different promoter types to initiate the transcription of small, structured RNAs. Here we present structures of Pol III preinitiation complexes, comprising the 17-subunit Pol III and the heterotrimeric transcription factor TFIIIB, bound to a natural promoter in different functional states. Electron cryo-microscopy reconstructions, varying from 3.7 Å to 5.5 Å resolution, include two early intermediates in which the DNA duplex is closed, an open DNA complex, and an initially transcribing complex with RNA in the active site...
January 17, 2018: Nature
https://www.readbyqxmd.com/read/29344073/bilateral-non-arteritic-anterior-ischaemic-optic-neuropathy-as-the-presentation-of-systemic-amyloidosis
#5
M Z Kanaan, A R Lorenzi, N Thampy, R Pandit, Margaret Dayan
A 75-year-old hypertensive female with stable idiopathic intermediate uveitis presented with bilateral sequential optic neuropathy with optic disc swelling. The optic neuropathy in the first affected eye (right) was thought to be due to non-arteritic anterior ischaemic optic neuropathy (NAION). Asymptomatic left optic disc swelling was found at routine review 2 months later, and a diagnosis of giant cell arteritis (GCA) was sought. Temporal artery duplex ultrasound showed the "halo sign," but a subsequent temporal artery biopsy showed light-chain (AL) amyloidosis with no signs of giant cell arteritis...
December 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/29333796/upper-extremity-deep-vein-thrombosis-symptoms-diagnosis-and-treatment
#6
REVIEW
Jaber Mustafa, Ilan Asher, Zev Sthoeger
Upper extremity deep vein thrombosis (UEDVT) is defined as thrombosis of the deep venous system (subclavian, axillary, brachial, ulnar, and radial veins), which drains the upper extremities. It can be caused by thoracic outlet anatomic obstruction, such as Paget-Schroetter syndrome, (primary) or by central intravenous catheters (secondary). UEDVT may be asymptomatic or present with acute severe pain and arm swelling. Clinical suspicion should be confirmed by diagnostic imaging procedures such as duplex ultrasound, computed tomography scan, or magnetic resonance imaging...
January 2018: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/29331436/jetstream-atherectomy-system-treatment-of-femoropopliteal-arteries-results-of-the-post-market-jet-registry
#7
William A Gray, Lawrence A Garcia, Ali Amin, Nicolas W Shammas
OBJECTIVES: To report on procedural, safety, and effectiveness outcomes of real-world practice with the Jetstream rotational atherectomy system for treatment of femoropopliteal artery lesions. BACKGROUND: Safety and effectiveness of treatment with the Jetstream device has been demonstrated in clinical trials, but outcomes during real-world clinical practice have yet to be examined. METHODS: 241 patients (66% male, mean age 67years, 41% diabetes; Rutherford 1-3) with de novo or restenotic (non-stent) femoropopliteal lesions ≥4cm in length were recruited...
December 27, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29322505/impact-of-bistrand-abasic-sites-and-proximate-orientation-on-dna-global-structure-and-duplex-energetics
#8
Conceição A Minetti, Jeffrey Y Sun, Daniel P Jacobs, Inkoo Kang, David P Remeta, Kenneth J Breslauer
Bistrand lesions embedded within a single helical turn of tridecameric deoxyoligonucleotide duplexes represent a model system for exploring the impact of clustered lesions that occur in vivo and pose a significant challenge to cellular repair machineries. Such investigations are essential for understanding the forces that dictate lesion-induced mutagenesis, carcinogenesis, and cytotoxicity within a context that mimics local helical perturbations caused by an ionizing radiation event. This study characterizes the structural and energy profiles of DNA duplexes harboring synthetic abasic sites (tetrahydrofuran, F) as models of clustered bistrand abasic (AP) lesions...
January 11, 2018: Biopolymers
https://www.readbyqxmd.com/read/29311285/lumenrecon-guidewire-pilot-study-of-a-novel-nonimaging-technology-for-accurate-vessel-sizing-and-delivery-of-therapy-in-femoropopliteal-disease
#9
Pradeep K Nair, Jeffrey G Carr, Brian Bigelow, Deepak L Bhatt, Zachary C Berwick, George Adams
BACKGROUND: Proper vessel sizing during endovascular interventions is crucial to avoid adverse procedural and clinical outcomes. LumenRECON (LR) is a novel, nonimaging, 0.035-inch wire-based technology that uses the physics-based principle of Ohm's law to provide a simple, real-time luminal size while also providing a platform for therapy delivery. This study evaluated the accuracy, reliability, and safety of the LR system in patients presenting for a femoropopliteal artery intervention...
January 2018: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29310232/electrochemical-aptasensor-for-multi-antibiotics-detection-based-on-endonuclease-and-exonuclease-assisted-dual-recycling-amplification-strategy
#10
Shengfeng Huang, Ning Gan, Tianhua Li, You Zhou, Yuting Cao, Youren Dong
An ultrasensitive electrochemical aptasensor for multiplex antibiotics detection based on endonuclease and exonuclease assisted dual recycling amplification strategy was proposed. Kanamycin and chloramphenicol were selected as candidates. Firstly, aptamers of the antibiotics were immobilized on bar A and then binding with their endonuclease labeled complementary DNA strands to construct enzyme-cleavage probes. Secondly, The nano zirconium-metal organic framework (NMOF) particles with 1,4-benzene-dicarboxylate (BDC) as linker was defined as UiO-66...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29291159/dual-radiosensitization-and-anti-stat3-anti-proliferative-strategy-based-on-delivery-of-gold-nanoparticle-oligonucleotide-nanoconstructs-to-head-and-neck-cancer-cells
#11
Surong Zhang, Suresh Gupta, Thomas J Fitzgerald, Alexei A Bogdanov
Constitutively activated signal transducer and activator of transcription 3 (STAT3) factor is an important therapeutic target in head and neck cancer (HNC). Despite early promising results, a reliable systemic delivery system for STAT3- targeted oligonucleotide (ODN) drugs is still needed for future clinical translation of anti-STAT3 therapies. We engineered and tested a novel ODN duplex/gold nanoparticle (AuNP)-based system carrying a therapeutic STAT3 decoy (STAT3d) payload. This strategy is two-pronged because of the additive STAT3 antagonism and radiosensitizing properties of AuNP...
2018: Nanotheranostics
https://www.readbyqxmd.com/read/29290905/duplex-collecting-system-in-a-pelvic-kidney-an-unusual-combination
#12
Francesca Giorlando, Chiara Recaldini, Anna Leonardi, Edoardo Macchi, Carlo Fugazzola
Pelvic kidney is a relatively common renal malformation as well as duplex kidney; however, the unilateral coexistence of these abnormalities is not frequently found. We present a case of a young woman with a history of hypertension in whom a pelvic and dysmorphic left kidney was discovered during ultrasound examination performed for the study of the renal arteries. Magnetic resonance imaging and computed tomography imaging revealed a duplex pelvic kidney. This combination is very rare; we have not found a similar case reported in the literature...
December 2017: Journal of Radiology Case Reports
https://www.readbyqxmd.com/read/29287183/electronic-properties-of-dna-description-of-weak-interactions-in-tata-box-like-chains
#13
Jorge Gutiérrez-Flores, Estrella Ramos, Carlos I Mendoza, Enrique Hernández-Lemus
DNA is one of the most important biomolecules since it contains all the genetic information about an organism. The tridimensional structure of DNA is a determinant factor that influences the physiological and biochemical mechanisms by which this molecule carries out its biological functions. It is believed that hydrogen bonds and π-π stacking are the most relevant non-covalent interactions regarding DNA stability. Due to its importance, several theoretical works have been made to describe these interactions, however, most of them often consider only the presence of two nitrogenous bases, having a limited overview of the participation of these in B-DNA stabilization...
December 12, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/29282977/comparison-of-different-strategies-for-the-development-of-highly-sensitive-electrochemical-nucleic-acid-biosensors-using-neither-nanomaterials-nor-nucleic-acid-amplification
#14
Víctor Ruiz-Valdepeñas Montiel, Eloy Povedano, Eva Vargas, Rebeca M Torrente-Rodríguez, María Pedrero, A Julio Reviejo, Susana Campuzano, Jose M Pingarron
Currently, electrochemical nucleic acid-based biosensing methodologies involving hybridization assays, specific recognition of RNA/DNA and RNA/RNA duplexes, and amplification systems provide an attractive alternative to conventional quantification strategies for the routine determination of relevant nucleic acids at different settings. A particularly relevant objective in the development of such nucleic acid biosensors is the design of as much as possible affordable, quick and simple methods while keeping the required sensitivity...
December 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29276583/utilization-of-chromic-polydiacetylene-assemblies-as-a-platform-to-probe-specific-binding-between-drug-and-rna
#15
Anothai Kamphan, Changjun Gong, Krishnagopal Maiti, Souvik Sur, Rakchart Traiphol, Dev P Arya
Recognition of nucleic acids remains an important endeavor in biology. Nucleic acids adopt shapes ranging from A-form (RNA and GC rich DNA) to B-form (AT rich DNA). We show, in this contribution, shape-specific recognition of A-U rich RNA duplex by a neomycin (Neo)-polydiacetylene (PDA) complex. PDA assemblies are fabricated by using a well-known diacetylene (DA) monomer, 10,12-pentacosadiynoic acid (PCDA). The response of poly(PCDA) assemblies is generated by mixing with a modified neomycin-PCDA monomer (Neo-PCDA)...
2017: RSC Advances
https://www.readbyqxmd.com/read/29273310/evaluation-of-fimc-and-bdha-based-duplex-pcr-for-specific-identification-and-differentiation-of-burkholderia-pseudomallei-from-near-neighbor-burkholderia-species
#16
Bhavani V Peddayelachagiri, Soumya Paul, Madhurjya Gogoi, Murali H Sripathy, Harsh V Batra
Assays for the rapid detection and accurate differentiation of Burkholderia pseudomallei from near-neighbor species are urgently needed in melioidosis endemic regions due to the high associated mortality and biowarfare importance of the pathogen. PCR-based methods have revolutionized this field due to the accuracy, sensitivity, and specificity that are achievable in a rapid way. In this study, a compound molecular detection system, consisting of a duplex PCR assay, was developed for the specific identification of Burkholderia pseudomallei and differentiation from other Burkholderia species...
November 28, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29248949/robot-assisted-extravesical-ureteral-reimplantation-revur-for-unilateral-vesico-ureteral-reflux-in-children-results-of-a-multicentric-international-survey
#17
Ciro Esposito, Lorenzo Masieri, Henri Steyaert, Maria Escolino, Raffaele Cerchione, Angela La Manna, Chiara Cini, Thomas S Lendvay
PURPOSE: This multicentric international retrospective study aimed to report the outcome of robot-assisted extravesical ureteral reimplantation (REVUR) in patients with unilateral vesico-ureteral reflux (VUR). METHODS: The medical records of 55 patients (35 girls, 20 boys) underwent REVUR in four international centers of pediatric robotic surgery for primary unilateral VUR were retrospectively reviewed. Patients' average age was 4.9 years. The preoperative grade of reflux was III in 12...
December 16, 2017: World Journal of Urology
https://www.readbyqxmd.com/read/29248492/r-loops-cause-genomic-instability-in-wiskott-aldrich-syndrome-thelper-lymphocytes
#18
Koustav Sarkar, Seong-Su Han, Kuo-Kwang Wen, Hans D Ochs, Loïc Dupré, Michael M Seidman, Yatin M Vyas
BACKGROUND: Wiskott-Aldrich syndrome (WAS), X-linked thrombocytopenia (XLT), and X-linked neutropenia (XLN), caused by WAS mutations affecting WASp expression or activity, manifest in immunodeficiency, autoimmunity, genomic-instability, and lymphoid-cancer. WASp supports filamentous-actin formation in the cytoplasm and gene-transcription in the nucleus. Although the genetic basis for XLT/WAS has been clarified, the relationships between mutant forms of WASp and the diverse features of these disorders remain ill-defined...
December 14, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29242065/preliminary-results-of-endovascular-aneurysm-sealing-from-the-multicenter-italian-research-on-nellix-endoprosthesis-irene-study
#19
Bruno Gossetti, Ombretta Martinelli, Michelangelo Ferri, Roberto Silingardi, Fabio Verzini
OBJECTIVE: Because of advances in technology and experience of the operator, endovascular aneurysm repair (EVAR) has supplanted open repair to treat abdominal aortic aneurysm (AAA). The low 30-day mortality and morbidity of EVAR make the endovascular approach particularly suitable for patients at high surgical risk. However, endoleak or endograft migration requiring secondary intervention or open surgical conversion is a limitation of EVAR. The Nellix system (Endologix, Inc, Irvine, Calif) has been designed to seal the entire AAA to overcome these limitations with EVAR...
December 11, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29234535/is-transurethral-incision-better-than-upper-pole-partial-nephrectomy-for-management-of-duplex-system-ureterocoele-diagnosed-in-the-first-year-of-life
#20
Amr Hodhod, Yasser A Noureldin, Mohamed El-Sherbiny
Objective: To compare the outcomes of transurethral incision (TUI) and upper pole partial nephrectomy (PN) in patients with duplex system ureterocoele (DSU). Patients and methods: We retrospectively reviewed the medical charts of patients who presented with DSU in the first-year of life and were managed with either TUI or PN. Patients' demographics, ultrasonography examinations, voiding cystourethrogram studies, and dimercaptosuccinic acid scans were reviewed. Also, the postoperative vesico-ureteric reflux status and febrile urinary tract infection occurrences, and subsequent surgical interventions were identified...
December 2017: Arab Journal of Urology
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