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hybridization chain reaction

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https://www.readbyqxmd.com/read/28917803/atp-mediated-rolling-circle-amplification-and-opening-dna-gate-for-drug-delivery-to-cell
#1
Yujie Wang, Xinxin Shang, Jia Liu, Yingshu Guo
Here, we have developed a facile fluorometric system for the detection of adenosine triphosphate (ATP) by a rolling circle amplification (RCA) based on proximity ligation mediated amplification, and simultaneously achieved the release of the anticancer drug doxorubicin (DOX) through the mesoporous silicon system. Once the ATP molecule is present, the linker DNA will be released from the graphene oxide (GO) surface and hybridized to the template DNA of the GO surface joining with ligation enzyme. RCA reaction is followed by the addition of the phi29 DNA polymerase...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28915003/the-evolution-of-dna-templated-synthesis-as-a-tool-for-materials-discovery
#2
Rachel K O'Reilly, Andrew J Turberfield, Thomas R Wilks
Precise control over reactivity and molecular structure is a fundamental goal of the chemical sciences. Billions of years of evolution by natural selection have resulted in chemical systems capable of information storage, self-replication, catalysis, capture and production of light, and even cognition. In all these cases, control over molecular structure is required to achieve a particular function: without structural control, function may be impaired, unpredictable, or impossible. The search for molecules with a desired function is often achieved by synthesizing a combinatorial library, which contains many or all possible combinations of a set of chemical building blocks (BBs), and then screening this library to identify "successful" structures...
September 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28910895/-correlation-analysis-of-the-epstein-barr-virus-recruited-regulatory-t-cells-in-nasopharyngeal-carcinoma-of-immune-escape
#3
P Bi, J Wang, J Lu, X Liu, F Wang, Y F Luo, S D Peng, X P Li
Objective: To investigate the relation of Epstein-Barr virus (EBV)-induced immune escape to regulatory T cells(Treg) in nasopharyngeal carcinoma(NPC). Methods: We recruited 83 patients who were pathologically diagnozed as nasopharyngeal carcinoma and treated in Nanfang Hospital from January to September 2016. CD4(+) CD25(+) FOXP3(+) Treg in peripheral blood was examined by flow cytometry and the level of EBV DNA in the blood was detected by quantitative real-time polymerase chain reaction(qRT-PCR)in 83 patients and 51 healthy adults as control...
September 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28906473/engineered-disease-resistance-in-cotton-using-rna-interference-to-knock-down-cotton-leaf-curl-kokhran-virus-burewala-and-cotton-leaf-curl-multan-betasatellite-expression
#4
Aftab Ahmad, Muhammad Zia-Ur-Rehman, Usman Hameed, Abdul Qayyum Rao, Ammara Ahad, Aneela Yasmeen, Faheem Akram, Kamran Shahzad Bajwa, Jodi Scheffler, Idrees Ahmad Nasir, Ahmad Ali Shahid, Muhammad Javed Iqbal, Tayyab Husnain, Muhammad Saleem Haider, Judith K Brown
Cotton leaf curl virus disease (CLCuD) is caused by a suite of whitefly-transmitted begomovirus species and strains, resulting in extensive losses annually in India and Pakistan. RNA-interference (RNAi) is a proven technology used for knockdown of gene expression in higher organisms and viruses. In this study, a small interfering RNA (siRNA) construct was designed to target the AC1 gene of Cotton leaf curl Kokhran virus-Burewala (CLCuKoV-Bu) and the βC1 gene and satellite conserved region of the Cotton leaf curl Multan betasatellite (CLCuMB)...
September 14, 2017: Viruses
https://www.readbyqxmd.com/read/28901323/human-epidermal-growth-factor-receptor-2-amplification-detection-by-droplet-digital-polymerase-chain-reaction-in-formalin-fixed-paraffin-embedded-breast-and-gastric-cancer-samples
#5
Xingwen Wang, Yunyan Wu, Xueling Song, Chengtao Sun, Changshun Wu, Hong Feng
OBJECTIVE: Human epidermal growth factor receptor 2 (HER2) is an important biomarker for the precise individualized treatment including trastuzumab of HER2-positive breast and gastric cancer. Immunohistochemistry (IHC) and fluorescence in situ hybridization (FISH) are the routine analyses for formalin-fixed paraffin-embedded (FFPE) samples. However, IHC is variable and depends on the evaluator, and FISH is a labor intensive and expensive method. We evaluated the feasibility of droplet digital polymerase chain reaction (ddPCR) as a precise and quantitative method for HER2 amplification test...
2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28894867/do-alkyl-groups-on-aromatic-or-aliphatic-structure-directing-agents-affect-water-stabilities-and-properties-of-hybrid-iodoargentates
#6
Guang-Ning Liu, Xu Zhang, Hong-Mei Wang, Hong Xu, Zi-Han Wang, Xiang-Long Meng, Ya-Nan Dong, Ruo-Yu Zhao, Cuncheng Li
Two types of in situ formed structure directing agents (SDAs) including aromatic triphenylphosphine (PPh3)- and aliphatic piperazine (H2pp)-derivative cations were used to synthesize five new hybrid iodoargentates, namely (EtPPh3)Ag3I4 (1, Et = ethyl), (n-PrPPh3)Ag3I4 (2, n-Pr = n-propyl), (i-PrPPh3)Ag5I6 (3, i-Pr = isopropyl), (Me4pp)0.5AgI2 (4, Me = methyl), and (H3app)2(Ag2I6)·2I·2H2O (5, app = N-aminoethylpiperazine). A comparative study of the two types of SDAs on the structures, stabilities and properties of hybrid iodoargentates was performed in detail...
September 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28892649/expression-of-phosphate-transporters-during-dental-mineralization
#7
L Merametdjian, S Beck-Cormier, N Bon, G Couasnay, S Sourice, J Guicheux, C Gaucher, L Beck
The importance of phosphate (Pi) as an essential component of hydroxyapatite crystals suggests a key role for membrane proteins controlling Pi uptake during mineralization in the tooth. To clarify the involvement of the currently known Pi transporters (Slc17a1, Slc34a1, Slc34a2, Slc34a3, Slc20a1, Slc20a2, and Xpr1) during tooth development and mineralization, we determined their spatiotemporal expression in murine tooth germs from embryonic day 14.5 to postnatal day 15 and in human dental samples from Nolla stages 6 to 9...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28892092/high-concordance-of-a-closed-system-rt-qpcr-breast-cancer-assay-for-her2-mrna-compared-to-clinically-determined-immunohistochemistry-fluorescence-in-situ-hybridization-and-quantitative-immunofluorescence
#8
Brad E Wasserman, Daniel E Carvajal-Hausdorf, Kenneth Ho, Wendy Wong, Natalie Wu, Victor C Chu, Edwin W Lai, Jodi M Weidler, Michael Bates, Veronique Neumeister, David L Rimm
Historically, mRNA measurements have been tested on several commercially available platforms, but none have gained broad acceptance for assessment of HER2. An mRNA measurement, as a continuous value, has the potential for use in adjudication of the equivocal category. Here we use a real-time quantitative reverse transcription polymerase chain reaction (RT-qPCR) assay in a closed, single-use cartridge, automated system. Multiple cores (1 mm in diameter) were retrospectively collected from 80 formalin-fixed paraffin-embedded (FFPE) tissue blocks with invasive breast cancer seen by Yale Pathology Labs between 1998 and 2011...
September 11, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28887628/development-of-a-set-of-pcr-markers-specific-to-aegilops-longissima-chromosome-arms-and-application-in-breeding-a-translocation-line
#9
Kunyang Wang, Zhishan Lin, Long Wang, Ke Wang, Qinghua Shi, Lipu Du, Xingguo Ye
Transcriptome data were used to develop 134 Aegilops longissima specific PCR markers and their comparative maps were constructed by contrasting with the homologous genes in the wheat B genome. Three wheat- Ae. longissima 1BL·1S (l) S translocation lines were identified using the correspondence markers. Aegilops longissima is an important wild species of common wheat that harbors many genes that can be used to improve various traits of common wheat (Triticum aestivum L.). To efficiently transfer the traits conferred by these Ae...
September 8, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28884579/facile-processing-of-free-standing-pani-swcnts-film-as-integrated-electrode-for-flexible-supercapacitor-application
#10
Fuwei Liu, Shaojuan Crystal Luo, Dong Liu, Wei Chen, Yang Huang, Lei Dong, Lei Wang
Flexible supercapacitors (SCs) with compact configuration are ideal energy storage device for portable electronics, owing to its original advantages (e.g. fast charging/discharging). To effectively reduce the volume of SC, an integrated electrode of free-standing PANI/SWCNTs film with high-performance has been developed via a facile solution deposition method, which can be employed as current collector and active material in the meantime. Thanks to the strong π-π interactions between PANI and CNTs, an efficient conductive network with ordered PANI molecular chains is formed in this hybrid film electrode, which is beneficial for ion diffusion process and fast redox reaction resulting in a high capacitance of 446 F g-1 and outstanding cycling stability, achieving 98% retention over 13000 cycles...
September 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28884055/a-biofunctionalizable-ink-platform-composed-of-catechol-modified-chitosan-and-reduced-graphene-oxide-platinum-nanocomposite
#11
Peter Sobolewski, Agata Goszczyńska, Małgorzata Aleksandrzak, Karolina Urbaś, Joanna Derkowska, Agnieszka Bartoszewska, Jacek Podolski, Ewa Mijowska, Mirosława El Fray
We present an ink platform for a printable polymer-graphene nanocomposite that is intended for the development of modular biosensors. The ink consists of catechol-modified chitosan and reduced graphene oxide decorated with platinum nanoparticles (rGO-Pt). We modified the chitosan with catechol groups, in order to obtain adhesive properties and improve solubility. Dispersions of rGO-Pt in ethylene glycol were admixed with an aqueous solution of modified chitosan to yield an ink that is suitable for non-contact piezoelectric printing using a commercial microplotter (Sonoplot GIX Microplotter Desktop)...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28877307/a-reconfigurable-multiplanar-in-vitro-simulator-for-real-time-absolute-motion-with-external-and-musculotendon-forces
#12
Joshua T Green, Rena F Hale, Jerome Hausselle, Roger V Gonzalez
Advancements in computational musculoskeletal biomechanics are constrained by a lack of experimental measurement under real-time physiological loading conditions. This paper presents the design, configuration, capabilities, accuracy, and repeatability of The University of Texas at El Paso Joint Load Simulator (UTJLS) by testing four cadaver knee specimens with 47 real-time tests including heel and toe squat maneuvers with and without musculotendon forces. The UTJLS is a musculoskeletal simulator consisting of two robotic manipulators and eight musculotendon actuators...
September 6, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28877060/clinicopathologic-diversity-of-undifferentiated-sarcoma-with-bcor-ccnb3-fusion-analysis-of-11-cases-with-a-reappraisal-of-the-utility-of-immunohistochemistry-for-bcor-and-ccnb3
#13
Atsuji Matsuyama, Eisuke Shiba, Yoshihisa Umekita, Kanae Nosaka, Takihiro Kamio, Hiroyuki Yanai, Chika Miyasaka, Reiko Watanabe, Ichiro Ito, Tomoko Tamaki, Shinichi Hayashi, Masanori Hisaoka
Undifferentiated sarcoma harboring the BCOR-CCNB3 fusion is characterized by its predilection to affect skeletons of adolescent males, cellular small round/spindle cell morphology, and CCNB3 immunoreactivity. We analyzed 11 cases of BCOR-CCNB3 sarcoma, 10 of which were identified in a reverse transcription-polymerase chain reaction-based screen of 85 patient samples recorded in our database as unclassified small round or spindle cell sarcomas. BCOR rearrangements were confirmed by fluorescence in situ hybridization in 8 tumors...
September 4, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28876055/supramolecular-assembly-of-peptide-amphiphiles
#14
Mark P Hendricks, Kohei Sato, Liam C Palmer, Samuel I Stupp
Peptide amphiphiles (PAs) are small molecules that contain hydrophobic components covalently conjugated to peptides. In this Account, we describe recent advances involving PAs that consist of a short peptide sequence linked to an aliphatic tail. The peptide sequence can be designed to form β-sheets among the amino acids near the alkyl tail, while the residues farthest from the tail are charged to promote solubility and in some cases contain a bioactive sequence. In water, β-sheet formation and hydrophobic collapse of the aliphatic tails induce assembly of the molecules into supramolecular one-dimensional nanostructures, commonly high-aspect-ratio cylindrical or ribbonlike nanofibers...
September 6, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28872300/ultra-sensitive-microrna-assay-via-surface-plasmon-resonance-responses-of-au-ag-nanorods-etching
#15
Yu Gu, Juan Song, Mei-Xing Li, Tingting Zhang, Wei Zhao, Jing-Juan Xu, Maili Liu, Hong-Yuan Chen
Quantification of trace serum circulate microRNAs is extremely important in clinical diagnosis but remains a great challenge. Herein we developed an ultra-sensitive platform for microRNA 141 (miR-141) detection based on a silver coated gold nanorods (Au@Ag NRs) etching process accompanied by surface plasmon resonance (SPR) shift. Both SPR absorption and scattering responses were monitored. Combined amplification cascades of catalyzed hairpin assembly (CHA) and hybridization chain reaction (HCR) with the sensitive SPR responses of plasmonic Au@Ag NRs, the proposed bioassay exhibited ultra-high sensitivity toward miRNA-141 with dynamic range from 5...
September 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28869524/hpv16-e6-and-e7-upregulate-interferon-induced-antiviral-response-genes-isg15-and-ifit1-in-human-trophoblast-cells
#16
Lea M M Ambühl, Annemarie B Villadsen, Ulrik Baandrup, Karen Dybkær, Suzette Sørensen
Human papillomavirus (HPV) is suggested to infect trophoblasts in the placenta, and HPV infections are reported to be more prevalent in pregnancies with adverse outcomes. Results are however controversial, and studies investigating the molecular consequences of placental HPV infections are lacking. We studied HPV DNA localization in the placenta in cases of spontaneous abortion/spontaneous preterm delivery as well as in elective abortion/normal full-term delivery. Using in vitro assays, we investigated downstream effects of HPV16 E6 and E7 expression in trophoblast cells at the gene expression level in order to gain increased biological insight into the interaction between HPV and the cellular host...
September 3, 2017: Pathogens
https://www.readbyqxmd.com/read/28868629/afm-imaging-of-hybridization-chain-reaction-mediated-signal-transmission-between-two-dna-origami-structures
#17
Sarah Helmig, Kurt Vesterager Gothelf
Signal transfer is central to the controlled exchange of information in biology and advanced technologies. Therefore, the development of reliable, long-ranging signal transfer systems for artificial nanoscale assemblies is of great scientific interest. We have designed such a system for signal transfer between two connected DNA nanostructures, using the hybridization chain reaction (HCR). Two sets of metastable DNA hairpins - of which one is immobilized in specific points along tracks on DNA origami structures - are polymerized to form a continuous DNA duplex, which is visible using atomic force microscopy (AFM)...
September 3, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28865929/non-natural-lipids-synthesis-and-characterization-of-esters-from-meta-carborane-1-carboxylic-acid
#18
Dhilan C Tribovane, Matthias S Scholz
Lipids are defined as apolar molecules comprising as major classes fatty acids and fatty acid esters of normally natural origin. Non-natural components, such as dicarba-closo-dodecaboranes (in short carboranes) can also form acids and esters, which reveal lipid-like properties. Carboranes are synthetic boron clusters featuring ten BH and two CH vertices, organized in icosahedral shape. The highly hydrophobic clusters are organic-inorganic hybrid constructs and can be modified at both the cluster boron and the cluster carbon atoms via adjusted organic reactions...
August 30, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28865923/rapid-and-label-free-electrochemical-dna-biosensor-for-detecting-hepatitis-a-virus
#19
Marisa Manzano, Sara Viezzi, Sandra Mazerat, Robert S Marks, Jasmina Vidic
Diagnostic systems that can deliver highly specific and sensitive detection of hepatitis A virus (HAV) in food and water are of particular interest in many fields including food safety, biosecurity and control of outbreaks. Our aim was the development of an electrochemical method based on DNA hybridization to detect HAV. A ssDNA probe specific for HAV (capture probe) was designed and tested on DNAs from various viral and bacterial samples using Nested-Reverse Transcription Polymerase Chain Reaction (nRT-PCR)...
August 19, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28865235/effect-of-electro-acupuncture-on-neuroplasticity-of-spinal-cord-transected-rats
#20
Xuyang Wang, Shiming Ju, Shiwen Chen, Wenwei Gao, Jun Ding, Gan Wang, Heli Cao, Hengli Tian, Xiaoli Li
BACKGROUND This study aimed to evaluate the effects of electro-acupuncture (EA) on neuroplasticity associated with the expressions of neurotrophic factors (NTFs) and their receptors in rats subjected to spinal cord transection (SCT). MATERIAL AND METHODS A total of 144 rats were randomly divided into 3 groups (n=48 per group): sham-operated group, SCT group, and EA (electro-acupuncture) group. Rats in SCT and EA groups received spinal cord transection at T10-T11 vertebral levels. Then, EA group rats received EA treatment...
September 2, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
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