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Guangwen Li, Zhijun Li, Xiuhua You, Jinghua Chen, Shurong Tang
A novel label-free electrochemical biosensor for the detection of Hg(2+) based on ligase mediated creation of G-quadruplex-hemin DNAzyme has been developed. Firstly, Cp probe was immobilized on the gold electrode surface through Au-SH bond. In the presence of Hg(2+), Cp and Ap probes were partly hybridized with the LJ probe respectively through the specific T-Hg(2+)-T interaction. Then, the adjacent 3'-OH terminal of Cp will link with the 5'-PO4 terminal of Ap to form a G-rich DNA at the function of T4-ligase...
December 1, 2016: Talanta
Maryam Ghahremani Nasab, Leila Hassani, Sara Mohammadi Nejad, Davood Norouzi
A DNA enzyme with peroxidase activity is a G-quadruplex-based DNAzyme formed by hemin and G-quadruplex DNA. Activity of peroxide DNAzymes can be influenced by the structure of quadruplex DNA. In this investigation, the interaction of hemin with T30695 G-quadruplex DNA is evaluated. Molecular dynamic simulation indicates that the binding mode of hemin to G-quadruplex DNA is end-stacking, which is consistent with absorption spectroscopy. Based on fluorescence spectroscopy, hemin ejects thiazole orange from bases of four-strand DNA...
October 17, 2016: Journal of Biological Physics
Ismaeel Baba-Rasul, Hemin M Hama Ameen, Awder Khazendar, Seerwan O Hasan
BACKGROUND: Isolated lower segment sacral fracture is very rare. To the best of our knowledge, there is only one case report of S4 stable fracture that was treated conservatively. CASE DESCRIPTION: Here, we report a 12-year-old female child who sustained isolated S5 fracture with anterior displacement of S5 and coccyx on S4. The patient was initially provided with conservative management for one month and twenty-five days. On the failure of this treatment procedure, the patient was treated surgically by partial coccygectomy with S4-S5 fixation after reduction by two K-wires...
October 13, 2016: World Neurosurgery
I Gupta, A Goyal, N K Singh, H N Yadav, P L Sharma
BACKGROUND: Attenuated cardioprotective effect of ischemic preconditioning (IPC) by reduced nitric oxide (NO) is a hallmark during diabetes mellitus (DM). Recently, we reported that the formation of caveolin-endothelial nitric oxide synthase (eNOS) complex decreases the release of NO, which is responsible for attenuation of IPC-induced cardioprotection in DM rat heart. Heme oxygenase-1 (HO-1) facilitates release of NO by disrupting caveolin-eNOS complex. The activity of HO-1 is decreased during DM...
October 12, 2016: Human & Experimental Toxicology
David M Harris, Lou Reinisch
BACKGROUND AND OBJECTIVE: Selective killing of pathogens by laser is possible due to the difference in absorption of photon energy by pathogens and host tissues. The optical properties of pathogenic microorganisms are used along with the known optical properties of soft tissues in calculations of the laser-induced thermal response of pathogen colonies embedded in a tissue model. The objective is to define the laser parameters that optimize pathogen destruction and depth of the bactericidal effect...
October 10, 2016: Lasers in Surgery and Medicine
Ling Zhang, Jens Ulstrup, Jingdong Zhang
DNA quadruplexes (qs) are a class of "non-canonical" oligonucleotides (OGNs) composed of stacked guanine (G) quartets stabilized by specific cations. Metal porphyrins selectively bind to G-qs complexes to form what is known as DNAzyme, which can exhibit peroxidase and other catalytic activity similar to heme group metalloenzymes. In the present study we investigate the electrochemical properties and the structure of DNAzyme monolayers on single-crystal Au(111)-electrode surfaces using cyclic voltammetry and scanning tunnelling microscopy under electrochemical potential control (in situ STM)...
September 20, 2016: Faraday Discussions
Liyan Zhang, Shuai Li, Minmin Dong, Yao Jiang, Ru Li, Shuo Zhang, Xiaoxia Lv, Lijun Chen, Hua Wang
A facile and efficient enzymatic reconstitution methodology has been proposed for high-catalysis peroxidase mimics by remolding the redox active centers of heme-containing proteins with the in-site biomineralized gold using hemoglobin (Hb) as a model. Catalytic hemin (Hem) was extracted from the active centers of Hb for the gold biomineralization and then reconstituted into apoHb to yield the Hem-Au@apoHb nanocomposites showing dramatically improved intrinsic catalysis and electrocatalysis over natural Hb and Hem...
September 22, 2016: Biosensors & Bioelectronics
David A Bemis, Brian H Johnson, Mary Jean Bryant, Rebekah D Jones, Brynn V McCleery, Cheryl B Greenacre, Vincent Perreten, Stephen A Kania
An organism reported in the early literature to be a rare cause of cervical lymphadenitis in guinea pigs, Streptobacillus moniliformis, has been reclassified as Caviibacter abscessus We describe a series of sequential cases of abscesses in guinea pigs that were presented to our clinic from which the only agent isolated was a unique, serum-requiring bacterium. Discrete colonies were not detected in 6.5% CO2 or anaerobically on routine primary isolation media containing up to 5% whole sheep blood, with and without cysteine, vitamin K, and hemin supplementation after 7 days of incubation at 37°C...
November 2016: Journal of Veterinary Diagnostic Investigation
Marie Preuße, Sergey I Bokarev, Saadullah G Aziz, Oliver Kühn
The Frenkel exciton model was adapted to describe X-ray absorption and resonant inelastic scattering spectra of polynuclear transition metal complexes by means of the restricted active space self-consistent field method. The proposed approach allows to substantially decrease the requirements on computational resources if compared to a full supermolecular quantum chemical treatment. This holds true, in particular, in cases where the dipole approximation to the electronic transition charge density can be applied...
November 2016: Structural Dynamics (Melville, N.Y.)
Andrew Holowiecki, Britton O'Shields, Matthew J Jenny
While heme is an important cofactor for numerous proteins, it is highly toxic in its unbound form and can perpetuate the formation of reactive oxygen species. Heme oxygenase enzymes (HMOX1 and HMOX2) degrade heme into biliverdin and carbon monoxide, with biliverdin subsequently being converted to bilirubin by biliverdin reductase (BVRa or BVRb). As a result of the teleost-specific genome duplication event, zebrafish have paralogs of hmox1 (hmox1a and hmox1b) and hmox2 (hmox2a and hmox2b). Expression of all four hmox paralogs and two bvr isoforms were measured in adult tissues (gill, brain and liver) and sexually dimorphic differences were observed, most notably in the basal expression of hmox1a, hmox2a, hmox2b and bvrb in liver samples...
September 23, 2016: Toxicology and Applied Pharmacology
Yun Wang, Xingli Ma, Xingguo Zhang, Xiaoyan He, Hemin Li, Dangqun Cui, Dongmei Yin
Peanut seeds have a high oil content making it an important oil crop. During development and germination, seeds undergo complex dynamic and physiological changes. Changes in lipid metabolism and underlying mechanisms during seed development have been studied extensively by DNA and RNA sequencing; however, there are few studies on dynamic changes of proteomics during peanut seed development and germination. In this study, proteomic analyses were carried out 20, 40, 60 and 80 days after pollination, and 5, 10, 20 and 30 days after germination using isobaric tags for relative and absolute quantitation (iTRAQ) technology to determine the protein profiles of lipid dynamics during peanut seed development and post germination...
September 27, 2016: Journal of Proteome Research
Yunqing Liu, Erhu Xiong, Xiaoyu Li, Junjing Li, Xiaohua Zhang, Jinhua Chen
Taking TdT-mediated hemin/G-quadruplex DNAzyme nanowires as NADH oxidase and HRP-mimicking DNAzyme, a novel DNA-based electrochemical method has been developed for sensitive and selective assay of alkaline phosphatase (AP) activity. The double-stranded DNA (dsDNA) probe consisted of thiol-functionalized DNA1 and 3'-phosphorylated DNA2, was immobilized on a gold nanoparticles (AuNPs) modified glassy carbon (GC) electrode. In the presence of AP, 3'-phosphoryl end of DNA2 was dephosphorylated. Terminal deoxynucletidyl transferase (TdT) catalyzed the sequential addition of deoxynucleotides (dTTPs) at 3'-OH end of DNA2 to extend DNA2 with a poly-T sequence...
September 20, 2016: Biosensors & Bioelectronics
Maria G Detsika, Pu Duann, Vassilios Atsaves, Apostolos Papalois, Elias A Lianos
Complement-activation controllers, including decay accelerating factor (DAF), are gaining emphasis as they minimize injury in various dysregulated complement-activation disorders, including glomerulopathies. Heme oxygenase (HO)-1 overexpression or induction has been shown to attenuate injury in complement-dependent models of glomerulonephritis. This study investigated whether up-regulation of DAF by heme oxygenase 1 (HO-1) is an underlying mechanism by using Hmox-1-deficient rats (Hmox1(+/-); Hmox1(-/-)) or rats with Hmox-1 overexpression targeted to glomerular epithelial cells (GEC(Hmox-1)), which are particularly vulnerable to complement-mediated injury owing to their terminally differentiated nature...
September 20, 2016: American Journal of Pathology
Cheng-Gang Li, Meng-Fan Pu, Chun-Zhu Li, Man Gao, Ming-Xia Liu, Cun-Zhi Yu, Hong Yan, Chun Peng, Yang Zhao, Yu Li, Ze-Long Ma, Xin-Ming Qi, Yi-Zheng Wang, Ling-Ling Miao, Jin Ren
AIM: Previous studies have shown that microRNA-1304 (miR-1304) is dysregulated in certain types of cancers, including non-small cell lung cancer (NSCLC), and might be involved in tumor survival and/or growth. In this study we investigated the direct target of miR-1304 and its function in NSCLC in vitro. METHODS: Human lung adenocarcinoma cell lines (A549 and NCI-H1975) were studied. The cell proliferation and survival were investigated via cell counting, MTT and colony-formation assays...
September 19, 2016: Acta Pharmacologica Sinica
Awder A Khazendar, Hemin M Hama Ameen, Nzar I Jabbar, Seerwan O Hasan, Talar S Ahmed, Alaa A Ali
BACKGROUND: Intradural extramedullary spinal teratoma (IEST) is a rare condition in adult patients with male predominance. It is commonly associated with spinal dysraphism, lumbar puncture and prior spinal surgeries. The study presents a 37-year-old male diagnosed with upper lumbar intradural extramedullary mature cystic teratoma without dysraphism or prior surgical interventions. CASE DESCRIPTION: Patient's symptoms included a lumbar backache which progressed to the toes, as well as the anterior region of both the thighs...
September 15, 2016: World Neurosurgery
Vanessa Hull, Jindong Zhang, Jinyan Huang, Shiqiang Zhou, Andrés Viña, Ashton Shortridge, Rengui Li, Dian Liu, Weihua Xu, Zhiyun Ouyang, Hemin Zhang, Jianguo Liu
Animals make choices about where to spend their time in complex and dynamic landscapes, choices that reveal information about their biology that in turn can be used to guide their conservation. Using GPS collars, we conducted a novel individual-based analysis of habitat use and selection by the elusive and endangered giant pandas (Ailuropoda melanoleuca). We constructed spatial autoregressive resource utilization functions (RUF) to model the relationship between the pandas' utilization distributions and various habitat characteristics over a continuous space across seasons...
2016: PloS One
Shuntaro Takahashi, Sudipta Bhowmik, Naoki Sugimoto
DNA guanine-quadruplexes (G-quadruplexes) complexed with the Fe-containing porphyrin, hemin (iron(III)-protoporphyrin IX), can catalyze oxidation reactions. This so-called DNAzyme has been widely used in the field of DNA nanotechnology. To improve DNAzyme properties, we sought to elucidate the interaction mechanism between G-quadruplex DNA and hemin. Here, we performed volumetric analyses of formation of the complex between an oligonucleotide with the sequence of human telomeric DNA (h-telo) and hemin. The G-quadruplex DNA alone and the G-quadruplex DNA-hemin complex were destabilized with increasing pressure in Na(+) buffer...
September 2, 2016: Journal of Inorganic Biochemistry
Xiaolin Xu, Min Wei, Yuanjian Liu, Xu Liu, Wei Wei, Yuanjian Zhang, Songqin Liu
Telomerase, a widely accepted cancer biomarker for early cancer diagnostics, is considered as an important therapeutic target. To now, it is still a challenging subject to develop a simple and sensitive strategy for telomerase activity detection. Herein, we reported a simple colorimetric strategy for label-free quantification of human telomerase activity in urine by using hemin-graphene nanomaterial (H-GNs). H-GNs possessed tailored dispersibility in the high salt concentration and highly active biomimetic oxidation catalyst property...
September 2, 2016: Biosensors & Bioelectronics
Bum-Yong Kang, Kathy Park, Jennifer M Kleinhenz, Tamara C Murphy, Roy L Sutliff, David Archer, C Michael Hart
Pulmonary hypertension (PH), a serious complication of sickle cell disease (SCD), causes significant morbidity and mortality. While recent study determined that hemin release during hemolysis triggers endothelial dysfunction in SCD, the pathogenesis of SCD-PH remains incompletely defined. This study examines peroxisome proliferator-activated receptor gamma (PPARγ) regulation in SCD-PH and endothelial dysfunction. PH and right ventricular hypertrophy (RVH) were studied in Townes humanized sickle cell (SS) and littermate control (AA) mice...
September 9, 2016: American Journal of Respiratory Cell and Molecular Biology
Kimberley Span, Johan J F Verhoef, Hedi Hunt, Cornelus F van Nostrum, Vera Brinks, Huub Schellekens, Wim E Hennink
Anemia resulting from iron deficiency is one of the most prevalent diseases in the world. As iron has important roles in several biological processes such as oxygen transport, DNA synthesis and cell growth, there is a high need for iron therapies that result in high iron bioavailability with minimal toxic effects to treat patients suffering from anemia. This study aims to develop a novel oral iron-complex formulation based on hemin-loaded polymeric micelles composed of the biodegradable and thermosensitive polymer methoxy-poly(ethylene glycol)-b-poly[N-(2-hydroxypropyl) methacrylamide-dilactate], abbreviated as mPEG-b-p(HPMAm-Lac2)...
September 3, 2016: European Journal of Pharmaceutics and Biopharmaceutics
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