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https://www.readbyqxmd.com/read/28167951/micrornas-are-intensively-regulated-during-induction-of-somatic-embryogenesis-in-arabidopsis
#1
Katarzyna Szyrajew, Dawid Bielewicz, Jakub Dolata, Anna M Wójcik, Katarzyna Nowak, Aleksandra Szczygieł-Sommer, Zofia Szweykowska-Kulinska, Artur Jarmolowski, Małgorzata D Gaj
Several genes encoding transcription factors (TFs) were indicated to have a key role in the induction of somatic embryogenesis (SE), which is triggered in the somatic cells of plants. In order to further explore the genetic regulatory network that is involved in the embryogenic transition induced in plant somatic cells, micro-RNA (miRNAs) molecules, the products of MIRNA (MIR) genes and the common regulators of TF transcripts, were analyzed in an embryogenic culture of Arabidopsis thaliana. In total, the expression of 190 genes of the 114 MIRNA families was monitored during SE induction and the levels of the primary (pri-miRNAs) transcripts vs...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28164519/angiotensin-converting-enzyme-inhibitors-influence-on-antiplatelet-therapy-of-clopidogrel-in-acs
#2
Shuo Yang, Chanjuan Cui, Jie Zhang, Rui Qiao
BACKGROUND: Clopidogrel is a prodrug, the minority of which is converted to an active metabolite by hepatic cytochrome P450 (CYP2C19), however, most of it is metabolized to inactive substance by hepatic carboxylesterase1 (CES1). Meanwhile angiotensin-converting enzyme inhibitors (ACEIs) are mostly metabolized by CES1. We aimed to assess the impact of ACEIs on platelet inhibition by clopidogrel. METHODS: We genotyped variants CES1, CYP2C19*2 and *3 in 502 patients with acute coronary syndrome (ACS) receiving clopidogrel therapy, and analyzed the effects of ACEIs on responsiveness to clopidogrel by the vasodilator-stimulated phosphoprotein (VASP) phosphorylation assay and ADP-stimulated impedance whole blood platelet aggregation assay...
October 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28161630/base-pair-opening-dynamics-of-the-microrna-precursor-pri-mir156a-affect-temperature-responsive-flowering-in-arabidopsis
#3
Hee-Eun Kim, Wanhui Kim, Ae-Ree Lee, Suhyun Jin, A Rim Jun, Nak-Kyoon Kim, Joon-Hwa Lee, Ji Hoon Ahn
Internal and environmental cues, including ambient temperature changes, regulate the timing of flowering in plants. Arabidopsis miR156 represses flowering and plays an important role in the regulation of temperature-responsive flowering. However, the molecular basis of miR156 processing at lower temperatures remains largely unknown. Here, we performed nuclear magnetic resonance studies to investigate the base-pair opening dynamics of model RNAs at 16 °C and investigated the in vivo effects of the mutant RNAs on temperature-responsive flowering...
February 2, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28138147/non-coding-rna-pri-mirna-processing-structure-is-key
#4
Louise Adams
No abstract text is available yet for this article.
March 2017: Nature Reviews. Genetics
https://www.readbyqxmd.com/read/28137615/regulation-of-mir-29b-1-a-transcription-and-identification-of-target-mrnas-in-cho-k1-cells
#5
Penn Muluhngwi, Kirsten Richardson, Joshua Napier, Eric C Rouchka, Justin L Mott, Carolyn M Klinge
miR-29b and miR-29a transcript levels were reported to increase in exponentially growing CHO-K1 cells. Here, we examine the regulation of miR-29b-1/a in CHO-K1 cells. We observed that 4-hydroxytamoxifen (4-OHT) increased pri-miR-29b-1 and pri-miR-29a transcription in CHO-K1 cells by activating endogenous estrogen receptor α (ERα). DICER, an established, bona fide target of miR-29b-1/a, was shown to be regulated by 4-OHT in CHO-K1 cells. We showed that miR-29b-1 and miR-29a serve a repressive role in cell proliferation, migration, invasion, and colony formation in CHO-K1 cells...
January 28, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28129114/macrophage-derived-mir-155-containing-exosomes-suppress-fibroblast-proliferation-and-promote-fibroblast-inflammation-during-cardiac-injury
#6
Chunxiao Wang, Congcong Zhang, Luxin Liu, Xi A, Boya Chen, Yulin Li, Jie Du
Inflammation plays an important role in cardiac injuries. Here, we examined the role of miRNA in regulating inflammation and cardiac injury during myocardial infarction. We showed that mir-155 expression was increased in the mouse heart after myocardial infarction. Upregulated mir-155 was primarily presented in macrophages and cardiac fibroblasts of injured hearts, while pri-mir-155 was only expressed in macrophages. mir-155 was also presented in exosomes derived from macrophages, and it can be transferred into cardiac fibroblasts by macrophage-derived exosomes...
January 4, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28115696/stv1-a-ribosomal-protein-binds-primary-microrna-transcripts-to-promote-their-interaction-with-the-processing-complex-in-arabidopsis
#7
Shengjun Li, Kan Liu, Shuxin Zhang, Xiaoyan Wang, Kestrel Rogers, Guodong Ren, Chi Zhang, Bin Yu
MicroRNAs (miRNAs) are key regulators of gene expression. They are processed from primary miRNA transcripts (pri-miRNAs), most of which are transcribed by DNA-dependent polymerase II (Pol II). miRNA levels are precisely controlled to maintain various biological processes. Here, we report that SHORT VALVE 1 (STV1), a conserved ribosomal protein, acts in miRNA biogenesis in Arabidopsis A portion of STV1 localizes in the nucleus and binds pri-miRNAs. Using pri-miR172b as a reporter, we show that STV1 binds the stem-loop flanked by a short 5' arm within pri-miRNAs...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28110541/validation-of-a-new-elisa-based-vasodilator-associated-stimulated-phosphoprotein-phosphorylation-assay-to-assess-platelet-reactivity-index-in-a-chinese-population
#8
Peng Ding, Yujie Wei, Nana Chen, Huiliang Liu
The level of platelet reactivity during P2Y12-adenosine diphosphate receptor antagonist is associated with ischemic and bleeding risks following percutaneous coronary intervention in acute coronary syndrome. Determining platelet reactivity inhibition may be valuable for confirming effective platelet inhibition for individual patients and identifying patients at risk of bleeding. The enzyme-linked immunosorbent assay (ELISA)-based vasodilator-stimulated phosphoprotein (VASP) assay offers unique advantages over other methods and has not been used in the Chinese population...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28109136/therapeutic-potential-of-targeting-wnt-%C3%AE-catenin-pathway-in-treatment-of-colorectal-cancer-rational-and-progress
#9
Afsane Bahrami, Forouzan Amerizadeh, Soodabeh ShahidSales, Majid Khazaei, Majid Ghayour-Mobarhan, Hamid Reza Sadeghnia, Mina Maftouh, Seyed Mahdi Hassanian, Amir Avan
Wnt/β-catenin pathway is one of the main/frequent dysregulated pathways in several tumor types, including colon cancer. Aberrant activation of this pathway is associated with cell proliferation, invasive behaviors and cell resistance, suggesting its potential value as a therapeutic target in treatment of CRC. Several agents have been developed for targeting of this pathway (e.g, natural agents: curcumin, 3,3-diindolylmethane, phytoestrogen; Synthetic/small Wnt inhibitors: Rofecoxib; PRI-724, CWP232291; and monoclonal antibody against frizzled receptors, Vanituctumab...
January 21, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28099855/primary-cell-culture-of-live-neurosurgically-resected-aged-adult-human-brain-cells-and-single-cell-transcriptomics
#10
Jennifer M Spaethling, Young-Ji Na, Jaehee Lee, Alexandra V Ulyanova, Gordon H Baltuch, Thomas J Bell, Steven Brem, H Isaac Chen, Hannah Dueck, Stephen A Fisher, Marcela P Garcia, Mugdha Khaladkar, David K Kung, Timothy H Lucas, Donald M O'Rourke, Derek Stefanik, Jinhui Wang, John A Wolf, Tamas Bartfai, M Sean Grady, Jai-Yoon Sul, Junhyong Kim, James H Eberwine
Investigation of human CNS disease and drug effects has been hampered by the lack of a system that enables single-cell analysis of live adult patient brain cells. We developed a culturing system, based on a papain-aided procedure, for resected adult human brain tissue removed during neurosurgery. We performed single-cell transcriptomics on over 300 cells, permitting identification of oligodendrocytes, microglia, neurons, endothelial cells, and astrocytes after 3 weeks in culture. Using deep sequencing, we detected over 12,000 expressed genes, including hundreds of cell-type-enriched mRNAs, lncRNAs and pri-miRNAs...
January 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/28095325/peroxisome-proliferator-activated-receptor-%C3%AE-activation-inhibits-liver-growth-through-mir-122-mediated-downregulation-of-cmyc
#11
Andrei A Yarushkin, Yuliya A Kazantseva, Vyacheslav S Kobelev, Yuliya A Pustylnyak, Vladimir O Pustylnyak
Although NR1C3 agonists inhibit cell growth, the molecular mechanism of their action has not been thoroughly characterized to date. A recent study demonstrated that NR1C3 can regulate miR-122 by binding to its promoter. Given that miR-122 can indirectly regulate cMyc-mediated promitogenic signaling by targeting E2f1, we hypothesized that NR1C3 activation inhibits hepatocyte proliferation through miR-122-mediated cMyc downregulation. In the present study, we examined if liver hyperplasia induced by a strong chemical mitogen for the liver, 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene (TCPOBOP), which is an agonist of NR1I3, can be repressed by NR1C3 activation through miR-122 upregulation...
January 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28092426/incomplete-reversibility-of-platelet-inhibition-following-prolonged-exposure-to-ticagrelor
#12
A J Gerrits, J A Jakubowski, A Sugidachi, A D Michelson, A L Frelinger
INTRODUCTION: Ticagrelor is described as a reversible P2Y12 antagonist. However, residual platelet inhibition persists after discontinuation of ticagrelor when plasma levels are undetectable. We assessed the reversibility of platelet inhibition by ticagrelor and its active metabolite (T-AM) in comparison with cangrelor and prasugrel's active metabolite (P-AM). METHODS: Whole blood was treated in vitro with ~50% inhibitory concentrations of ticagrelor, T-AM, cangrelor, P-AM and assessed for ADP-stimulated activated GPIIb-IIIa and P-selectin and vasodilator stimulated phosphoprotein (VASP) platelet reactivity index (PRI) before and after 100-fold dilution...
January 16, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28087842/novel-determinants-of-mammalian-primary-microrna-processing-revealed-by-systematic-evaluation-of-hairpin-containing-transcripts-and-human-genetic-variation
#13
Christine Anne Roden, Jonathan Gaillard, Shaveta Kanoria, William Rennie, Syndi Barish, Jijun Cheng, Wen Pan, Jun Liu, Chris Cotsapas, Ye Ding, Jun Lu
Mature microRNAs (miRNAs) are processed from hairpin-containing primary miRNAs (pri-miRNAs). However, rules that distinguish pri-miRNAs from other hairpin-containing transcripts in the genome are incompletely understood. By developing a computational pipeline to systematically evaluate 30 structural and sequence features of mammalian RNA hairpins, we report several new rules that are preferentially utilized in miRNA hairpins and govern efficient pri-miRNA processing. We propose that a hairpin stem length of 36+/-3nt is optimal for pri-miRNA processing...
January 13, 2017: Genome Research
https://www.readbyqxmd.com/read/28075525/dynamic-remodeling-of-arteriolar-collaterals-after-acute-occlusion-in-chick-chorioallantoic-membrane
#14
Weiwei Xiang, Bettina Reglin, Bianca Nitzsche, Martin Maibier, Wenwei Rong, Björn Hoffmann, Alfredo Ruggeri, Pedro Guimarães, Timothy W Secomb, Axel R Pries
After arteriolar occlusion, collaterals enlarge and initially elevated wall shear stress (WSS) normalizes. While most previous studies focused on endpoints of such adaptive changes in larger collaterals the present investigation aimed to continuously determine the relation between WSS and diameter in microvascular collaterals during adaptive reactions METHODS: In Hamburger-Hamilton stage 40 chick chorioallantoic membranes (CAMs), junction points between arteriolar segments were identified and the third upstream segment on one side was occluded...
January 11, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/28074552/validation-of-microrna-pathway-polymorphisms-in-esophageal-adenocarcinoma-survival
#15
Olusola O Faluyi, Lawson Eng, Xin Qiu, Jiahua Che, Qihuang Zhang, Dangxiao Cheng, Nanjiao Ying, Alvina Tse, Qin Kuang, Lorin Dodbiba, Daniel J Renouf, Sharon Marsh, Sevtap Savas, Helen J Mackay, Jennifer J Knox, Gail E Darling, Rebecca K S Wong, Wei Xu, Abul Kalam Azad, Geoffrey Liu
Polymorphisms in miRNA and miRNA pathway genes have been previously associated with cancer risk and outcome, but have not been studied in esophageal adenocarcinoma outcomes. Here, we evaluate candidate miRNA pathway polymorphisms in esophageal adenocarcinoma prognosis and attempt to validate them in an independent cohort of esophageal adenocarcinoma patients. Among 231 esophageal adenocarcinoma patients of all stages/treatment plans, 38 candidate genetic polymorphisms (17 biogenesis, 9 miRNA targets, 5 pri-miRNA, 7 pre-miRNA) were genotyped and analyzed...
January 11, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28068184/antimicrobial-susceptibilities-of-flavobacterium-psychrophilum-isolates-from-the-great-lakes-basin-michigan
#16
Danielle Van Vliet, Thomas P Loch, Peter Smith, Mohamed Faisal
Flavobacterium psychrophilum is a serious pathogen of salmonids worldwide, a matter that is compounded by the lack of effective vaccine preparations. As a result, biosecurity measures and antimicrobial agents remain the only available methods to control diseases caused by F. psychrophilum. It is feared that antimicrobial use may have led to the development of F. psychrophilum strains with reduced susceptibility. Therefore, the primary objective of this study was to determine the antimicrobial susceptibility profiles of 50 F...
January 9, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28067243/association-of-polymorphisms-in-three-pri-mirnas-that-target-pepsinogen-c-with-the-risk-and-prognosis-of-gastric-cancer
#17
Ye-Feng Wu, Qian Xu, Cai-Yun He, Ying Li, Jing-Wei Liu, Na Deng, Li-Ping Sun, Yuan Yuan
We aimed to explore the associations of polymorphisms in three microRNAs (miRNAs) (let-7e rs8111742, miR-365b rs121224 and miR-4795 rs1002765) that target PGC with the risk and prognosis of gastric cancer/atrophic gastritis. Sequenom's MassArray was used to genotype the miRNA polymorphisms in 724 gastric cancer cases, 862 atrophic gastritis cases and 862 controls in a Chinese population. We found that let-7e rs8111742 and miR-4795 rs1002765 were associated with the risk of gastric cancer in the H. pylori-positive subgroup...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28065907/platelet-reactivity-in-human-immunodeficiency-virus-infected-patients-on-dual-antiplatelet-therapy-for-an-acute-coronary-syndrome-the-evere2st-hiv-study
#18
Marie Hauguel-Moreau, Franck Boccara, Anders Boyd, Joe-Elie Salem, Delphine Brugier, Angélique Curjol, Jean-Sébastien Hulot, Mathieu Kerneis, Sophie Galier, Ariel Cohen, Gilles Montalescot, Jean-Philippe Collet, Johanne Silvain
AIM: To explore platelet reactivity on dual antiplatelet therapy (DAPT) of acute coronary syndrome (ACS) patients infected with HIV. METHODS AND RESULTS: Acute coronary syndrome patients infected with HIV (n = 80) were matched to ACS patients without HIV (n = 160) on age, sex, diabetes, and DAPT (aspirin 100%, clopidogrel 68%, prasugrel 31%, ticagrelor 1%). Platelet reactivity was evaluated after ACS (>30 days) by measuring residual platelet aggregation (RPA) to aspirin and to P2Y12 inhibitors with light transmission aggregometry (LTA), VerifyNow aspirin assay (ARU), and P2Y12 assay (PRU) and with the VASP platelet reactivity index (VASP-PRI)...
January 8, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28059551/wnt-signaling-in-chronic-rhinosinusitis-with-nasal-polyps
#19
Robert Böscke, Eszter K Vladar, Michael Könnecke, Birgit Hüsing, Robert Linke, Ralph Pries, Norbert Reiling, Jeffrey D Axelrod, Jayakar V Nayak, Barbara Wollenberg
The signaling pathways that sustain the disease process of chronic rhinosinusitis with nasal polyps (CRSwNP) remain poorly understood. We sought to determine the expression levels of Wnt signaling genes in CRSwNP, and to study the role of the Wnt pathway in inflammation and epithelial remodeling in the nasal mucosa. Microarrays and RT-qPCR comparing gene expression in matched nasal polyps (NP) and inferior turbinates (IT) revealed that WNT2B, WNT3A, WNT4, WNT7A, WNT7B and FZD2 were upregulated, and FZD1, LRP5, LRP6 and WIF1 downregulated in NPs...
January 6, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28057565/development-and-validation-of-a-continuously-age-adjusted-measure-of-patient-condition-for-hospitalized-children-using-the-electronic-medical-record
#20
Michael J Rothman, Joseph J Tepas, Andrew J Nowalk, James E Levin, Joan M Rimar, Albert Marchetti, Allen L Hsiao
Awareness of a patient's clinical status during hospitalization is a primary responsibility for hospital providers. One tool to assess status is the Rothman Index (RI), a validated measure of patient condition for adults, based on empirically derived relationships between 1-year post-discharge mortality and each of 26 clinical measurements available in the electronic medical record. However, such an approach cannot be used for pediatrics, where the relationships between risk and clinical variables are distinct functions of patient age, and sufficient 1-year mortality data for each age group simply does not exist...
January 2, 2017: Journal of Biomedical Informatics
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