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https://www.readbyqxmd.com/read/29457975/fluorescent-dna-probing-nanoscale-mno2-adsorption-dissolution-by-thiol-and-nanozyme-activity
#1
Liu Wang, Zhicheng Huang, Yibo Liu, Jian Wu, Juewen Liu
Manganese dioxide (MnO2) is an interesting material due to its excellent biocompatibility and magnetic properties. Adsorption of DNA to MnO2 is potentially interest for drug delivery and sensing applications. However, little fundamental understanding is known about their interactions. In this work, carboxyfluorescein (FAM)-labeled DNA oligonucleotides were used to explore the effect of salt concentration, pH, and DNA sequence and length for adsorption by MnO2, and comparisons were made with graphene oxide (GO)...
February 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29457714/selective-recognition-of-rna-substrates-by-adar-deaminase-domains
#2
Yuru Wang, SeHee Park, Peter A Beal
Adenosine deamination is one of the most prevalent post-transcriptional modifications in mRNA and is catalyzed by ADAR1 and ADAR2 in humans. ADAR1 and ADAR2 have different substrate selectivity, which is believed to mainly originate from the proteins' deaminase domains (hADAR1d and hADAR2d, respectively). RNA-seq of the S. cerevisiae transcriptome subjected to ADAR-catalyzed RNA editing identified substrates with common secondary structure features preferentially edited by hADAR1d over hADAR2d. The relatively small size and efficient reaction of one of these substrates suggested it could be useful for further study of the hADAR1d reaction...
February 19, 2018: Biochemistry
https://www.readbyqxmd.com/read/29456531/first-occurrence-of-plasmablastic-lymphoma-in-adenosine-deaminase-deficient-severe-combined-immunodeficiency-disease-patient-and-review-of-the-literature
#3
Maddalena Migliavacca, Andrea Assanelli, Maurilio Ponzoni, Roberta Pajno, Federica Barzaghi, Fabio Giglio, Francesca Ferrua, Marta Frittoli, Immacolata Brigida, Francesca Dionisio, Roberto Nicoletti, Miriam Casiraghi, Maria Grazia Roncarolo, Claudio Doglioni, Jacopo Peccatori, Fabio Ciceri, Maria Pia Cicalese, Alessandro Aiuti
Adenosine deaminase-deficient severe combined immunodeficiency disease (ADA-SCID) is a primary immune deficiency characterized by mutations in the ADA gene resulting in accumulation of toxic compounds affecting multiple districts. Hematopoietic stem cell transplantation (HSCT) from a matched donor and hematopoietic stem cell gene therapy are the preferred options for definitive treatment. Enzyme replacement therapy (ERT) is used to manage the disease in the short term, while a decreased efficacy is reported in the medium-long term...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29456511/p2y-12-receptors-in-tumorigenesis-and-metastasis
#4
REVIEW
Patrizia Ballerini, Melania Dovizio, Annalisa Bruno, Stefania Tacconelli, Paola Patrignani
Platelets, beyond their role in hemostasis and thrombosis, may sustain tumorigenesis and metastasis. These effects may occur via direct interaction of platelets with cancer and stromal cells and by the release of several platelet products. Platelets and tumor cells release several bioactive molecules among which a great amount of adenosine triphosphate (ATP) and adenosine diphosphate (ADP). ADP is also formed extracellularly from ATP breakdown by the ecto-nucleoside-triphosphate-diphosphohydrolases. Under ATP and ADP stimulation the purinergic P2Y1 receptor (R) initiates platelet activation followed by the ADP-P2Y12 R-mediated amplification...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29456159/cd150-high-bone-marrow-tregs-maintain-hematopoietic-stem-cell-quiescence-and-immune-privilege-via-adenosine
#5
Yuichi Hirata, Kazuhiro Furuhashi, Hiroshi Ishii, Hao Wei Li, Sandra Pinho, Lei Ding, Simon C Robson, Paul S Frenette, Joji Fujisaki
A crucial player in immune regulation, FoxP3+ regulatory T cells (Tregs) are drawing attention for their heterogeneity and noncanonical functions. Here, we describe a Treg subpopulation that controls hematopoietic stem cell (HSC) quiescence and engraftment. These Tregs highly expressed an HSC marker, CD150, and localized within the HSC niche in the bone marrow (BM). Specific reduction of BM Tregs achieved by conditional deletion of CXCR4 in Tregs increased HSC numbers in the BM. Adenosine generated via the CD39 cell surface ectoenzyme on niche Tregs protected HSCs from oxidative stress and maintained HSC quiescence...
February 7, 2018: Cell Stem Cell
https://www.readbyqxmd.com/read/29455417/effect-of-yulangsan-polysaccharide-on-the-reinstatement-of-morphine-induced-conditioned-place-preference-in-sprague-dawley-rats
#6
Chunxia Chen, Zhihuan Nong, Xingmei Liang, Mingyu Meng, Feifei Xuan, Qiuqiao Xie, Junhui He, Renbin Huang
We previously reported that Yulangsan polysaccharide (YLSP), which was isolated from the root of Millettia pulchra Kurz, attenuates withdrawal symptoms of morphine dependence by regulating the nitric oxide pathway and modulating monoaminergic neurotransmitters. In this study, we investigated the effects and mechanism of YLSP on the reinstatement of morphine-induced conditioned place preference (CPP) in rats. A CPP procedure was employed to assess the behavior of rats, and indicators of serum and four brain regions (nucleus accumbens, ventral tegmental area, hippocampus and prefrontal cortex) were determined to explore its underlying mechanism...
February 17, 2018: Neurochemical Research
https://www.readbyqxmd.com/read/29455338/extracellular-atp-is-differentially-metabolized-on-papillary-thyroid-carcinoma-cells-surface-in-comparison-to-normal-cells
#7
Ana Paula Santin Bertoni, Rafael Paschoal de Campos, Marisa Tsao, Elizandra Braganhol, Tania Weber Furlanetto, Márcia Rosângela Wink
The incidence of differentiated thyroid cancer has been increasing. Nevertheless, its molecular mechanisms are not well understood. In recent years, extracellular nucleotides and nucleosides have emerged as important modulators of tumor microenvironment. Extracellular ATP is mainly hydrolyzed by NTPDase1/CD39 and NTPDase2/CD39L1, generating AMP, which is hydrolyzed by ecto-5'-nucleotidase (CD73) to adenosine, a possible promoter of tumor growth and metastasis. There are no studies evaluating the expression and functionality of these ectonucleotidases on normal or tumor-derived thyroid cells...
February 17, 2018: Cancer Microenvironment: Official Journal of the International Cancer Microenvironment Society
https://www.readbyqxmd.com/read/29454993/in-vitro-studies-of-disease-linked-variants-of-human-trna-nucleotidyltransferase-reveal-decreased-thermal-stability-and-altered-catalytic-activity
#8
M Leibovitch, P J Hanic-Joyce, P B M Joyce
Mutations in the human TRNT1 gene encoding tRNA nucleotidyltransferase (tRNA-NT), an essential enzyme responsible for addition of the CCA (cytidine-cytidine-adenosine) sequence to the 3'-termini of tRNAs, have been linked to disease phenotypes including congenital sideroblastic anemia with B-cell immunodeficiency, periodic fevers and developmental delay (SIFD) or retinitis pigmentosa with erythrocyte microcytosis. The effects of these disease-linked mutations on the structure and function of tRNA-NT have not been explored...
February 15, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29454963/adenosine-receptors-enhance-the-atp-induced-odontoblastic-differentiation-of-human-dental-pulp-cells
#9
Xiaosong Yi, Wei Wang, Qiufei Xie
Purinergic signaling regulates various biological processes through the activation of adenosine receptors (ARs) and P2 receptors. ATP induces the odontoblastic differentiation of human dental pulp cells (HDPCs) via P2 receptors. However, there is no information available about the roles of ARs in HDPC odontoblastic differentiation induced by ATP. Here, we found that HDPCs treated with ATP showed higher activity of ADORA1 (A1 R), ADORA2B (A2B R), and ADORA3 (A3 R). Inhibition of A1 R and A2B R attenuated ATP-induced odontoblastic differentiation of HDPCs, whereas activation of the two receptors enhanced the odontoblastic differentiation induced by ATP...
February 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29454746/phosphodiesterase-inhibition-and-modulation-of-corticostriatal-and-hippocampal-circuits-clinical-overview-and-translational-considerations
#10
REVIEW
P R A Heckman, A Blokland, E P P Bollen, J Prickaerts
The corticostriatal and hippocampal circuits contribute to the neurobiological underpinnings of several neuropsychiatric disorders, including Alzheimer's disease, Parkinson's disease and schizophrenia. Based on biological function, these circuits can be clustered into motor circuits, associative/cognitive circuits and limbic circuits. Together, dysfunctions in these circuits produce the wide range of symptoms observed in related neuropsychiatric disorders. Intracellular signaling in these circuits is largely mediated through the cyclic adenosine monophosphate (cAMP)/protein kinase A (PKA) pathway with an additional role for the cyclic guanosine monophosphate (cGMP)/ protein kinase G (PKG) pathway, both of which can be regulated by phosphodiesterase inhibitors (PDE inhibitors)...
February 15, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29453293/protein-phosphorylation-maintains-the-normal-function-of-cloned-human-ca-v-2-3-channels
#11
Felix Neumaier, Serdar Alpdogan, Jürgen Hescheler, Toni Schneider
R-type currents mediated by native and recombinant Ca v 2.3 voltage-gated Ca 2+ channels (VGCCs) exhibit facilitation (run-up) and subsequent decline (run-down) in whole-cell patch-clamp recordings. A better understanding of the two processes could provide insight into constitutive modulation of the channels in intact cells, but low expression levels and the need for pharmacological isolation have prevented investigations in native systems. Here, to circumvent these limitations, we use conventional and perforated-patch-clamp recordings in a recombinant expression system, which allows us to study the effects of cell dialysis in a reproducible manner...
February 16, 2018: Journal of General Physiology
https://www.readbyqxmd.com/read/29452744/emerging-concepts-in-diagnosis-and-treatment-of-syncope-by-pacing
#12
REVIEW
Richard Sutton, Jean-Claude Deharo, Michele Brignole, Mohamed H Hamdan
Neuroendocrine syncope is a newly proposed term to embody both syncope of reflex and adenosine-related etiology. Recent publications on tilt testing have revealed the presence of a hypotensive tendency in some patients, even in the face of severe cardioinhibition. This new understanding may allow better selection of older reflex syncope patients, documented by ECG loop recorder, for successful pacing where tilt testing is ideally negative for a good result in terms of few syncope recurrences and prompts a less aggressive management policy when hypotensive medication is required...
February 13, 2018: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29452205/impaired-cerebral-microcirculation-induced-by-ammonium-chloride-in-rats-is-due-to-cortical-adenosine-release
#13
Peter Nissen Bjerring, Esben Jannik Bjerrum, Fin Stolze Larsen
BACKGROUND: Liver failure results in hyperammonaemia, impaired regulation of cerebral microcirculation, encephalopathy and death. However, the key mediator that alters cerebral microcirculation remains unidentified. In this study we show that topical ammonium significantly increases periarteriolar adenosine tone on the brain surface of healthy rats and is associated with a disturbed microcirculation. METHODS: Cranial windows were prepared in anaesthetized Wistar rats...
February 13, 2018: Journal of Hepatology
https://www.readbyqxmd.com/read/29452068/glycyrrhizin-attenuates-histamine-mediated-muc5ac-upregulation-inflammatory-cytokine-production-and-aquaporin-5-downregulation-through-suppressing-the-nf-%C3%AE%C2%BAb-pathway-in-human-nasal-epithelial-cells
#14
Haixia Li, Dandan Guo, Liangran Zhang, Xiao Feng
Allergic rhinitis (AR) is a chronic respiratory inflammatory disease. Glycyrrhizin is a main bioactive component of the licorice root extract and exhibits anti-inflammatory activity. However, the role of glycyrrhizin in AR has not been studied. The aim of the present study was to investigate the effect of glycyrrhizin on histamine-induced human nasal epithelial cells (HNEpCs). Here, we found that glycyrrhizin (20 or 40 μM) inhibited histamine-induced the mRNA expression and secretion of mucin 5 subtype AC (MUC5AC), interleukin (IL)-6 and IL-8 in HNEpCs...
February 13, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29449643/sirt2-regulates-oxidative-stress-induced-cell-death-through-deacetylation-of-c-jun-nh-2-terminal-kinase
#15
Mohsen Sarikhani, Sneha Mishra, Perumal Arumugam Desingu, Chaithanya Kotyada, Donald Wolfgeher, Mahesh P Gupta, Mahavir Singh, Nagalingam R Sundaresan
c-Jun NH 2 -terminal kinases (JNKs) are responsive to stress stimuli and their activation regulate key cellular functions, including cell survival, growth, differentiation and aging. Previous studies demonstrate that activation of JNK requires dual phosphorylation by the mitogen-activated protein kinase kinases. However, other post-translational mechanisms involved in regulating the activity of JNK have been poorly understood. In this work, we studied the functional significance of reversible lysine acetylation in regulating the kinase activity of JNK...
February 15, 2018: Cell Death and Differentiation
https://www.readbyqxmd.com/read/29449536/impaired-autophagic-flux-is-associated-with-the-severity-of-trauma-and-the-role-of-a-2a-r-in-brain-cells-after-traumatic-brain-injury
#16
Xu-Jia Zeng, Ping Li, Ya-Lei Ning, Yan Zhao, Yan Peng, Nan Yang, Zi-Ai Zhao, Jiang-Fan Chen, Yuan-Guo Zhou
Recent studies have shown that after traumatic brain injury (TBI), the number of autophagosomes is markedly increased in brain cells surrounding the wound; however, whether autophagy is enhanced or suppressed by TBI remains controversial. In our study, we used a controlled cortical impact system to establish models of mild, moderate and severe TBI. In the mild TBI model, the levels of autophagy-related protein 6 (Beclin1) and autophagy-related protein 12 (ATG12)-autophagy-related protein 5 (ATG5) conjugates were increased, indicating the enhanced initiation of autophagy...
February 14, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29449127/evaluating-the-effect-of-six-proton-pump-inhibitors-on-the-antiplatelet-effects-of-clopidogrel
#17
Eugene R Przespolewski, Erica S Westphal, Michelle Rainka, Nicholas M Smith, Vernice Bates, Fran M Gengo
BACKGROUND AND GOAL: Cytochrome P450 (CYP) enzymes are responsible for the conversion of clopidogrel into its active metabolite and the metabolism of proton pump inhibitors (PPIs), which may also inhibit CYP enzymes. A current Food and Drug Administration advisory suggests avoiding esomeprazole and omeprazole while taking clopidogrel because of concerns that PPIs may compromise clopidogrel's antiplatelet effects. The objective of the present study was to examine the robustness of this interaction using a well-controlled study design in a population of participants free of confounders...
February 12, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29448155/characterization-of-a-superman-like-gene-mdsup11-in-apple-malus-%C3%A3-domestica-borkh
#18
Ke Xu, LiMin Wang, Na Liu, Xuan Xie, YuanDi Zhu
Arabidopsis SUPERMAN and its family members of its family play important roles in plant growth and floral organ development; yet much less is known about their functions expanding in apple tree development. Previous work has identified 12 SUP-like genes in the apple (Malus × domestica Borkh.) genome, and the MdSUP11 which is expressed in both vegetative and reproductive organs of apple. However, the function of MdSUP11 remains obscure. In this study, the β-glucuronidase expression driven by the MdSUP11 native promoter was detected in roots, young leaves, and floral organs of transgenic Arabidopsis...
December 6, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29448091/evidence-and-prospective-of-plant-derived-flavonoids-as-antiplatelet-agents-strong-candidates-to-be-drugs-of-future
#19
Harron Khan, Mohammad Jawad, Mohammad Ajmal Kamal, Alessandra Baldi, Jianbo Xiao, Seyed Mohammad Nabavi, Maria Daglia
Platelets are involved in hemostasis, inflammation, and thrombosis processes. Following a vascular damage, the endothelium releases protein factors, allowing the adhesion of subendothelium to platelets. Then platelets are activated, leading to the secretion of biologically-active ligands including thromboxane A2, adenosine diphosphate and serotonin. Aspirin, clopidogrel and warfarin are the most common drugs used to meet the challenges of platelet aggregation. However, these agents face issues with aspirin resistance and bleeding...
February 12, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29447672/formulation-of-dna-chimera-templates-effects-on-emission-behavior-of-silver-nanoclusters-and-sensing
#20
Shi Ting Lee, David Beaumont, Xiao Di Su, Kasturi Muthoosamy, Siu Yee New
Single strand DNA (ssDNA) chimeras consisting of a silver nanoclusters-nucleating sequence (NC) and an aptamer are widely employed to synthesize functional silver nanoclusters (AgNCs) for sensing purpose. Despite its simplicity, this chimeric-templated AgNCs often leads to undesirable turn-off effect, which may suffer from false positive signals caused by interference. In our effort to elucidate how the relative position of NC and aptamer affects the fluorescence behavior and sensing performance, we systematically formulated these NC and aptamer regions at different position in a DNA chimera...
June 20, 2018: Analytica Chimica Acta
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