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https://www.readbyqxmd.com/read/28323446/leguminosae-native-nodulating-bacteria-from-a-gold-mine-as-contaminated-soil-multi-resistance-to-trace-elements-and-possible-role-in-plant-growth-and-mineral-nutrition
#1
Wesley de M Rangel, Silvia M de Oliveira Longatti, Paulo A A Ferreira, Daiane S Bonaldi, Amanda A Guimarães, Sofie Thijs, Nele Weyens, Jaco Vangronsveld, Fatima M S Moreira
Efficient N2-fixing Leguminosae nodulating bacteria resistant to As may facilitate plant growth on As-contaminated sites. In order to identify bacteria possessing these features, 24 strains were isolated from nodules of the trap species Crotalaria spectabilis (12) and Stizolobium aterrimum (12) growing on an As-contaminated gold mine site. 16S rRNA gene sequencing revealed that most of the strains belonged to the group of α-Proteobacteria, being representatives of the genera Bradyrhizobium, Rhizobium, Inquilinus, Labrys, Bosea, Starkeya and Methylobacterium...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28319446/good-laboratory-practice-preclinical-safety-studies-for-gsk2696273-mlv-vector-based-ex-vivo-gene-therapy-for-adenosine-deaminase-deficiency-severe-combined-immunodeficiency-in-nsg-mice
#2
Nicola Carriglio, Jan Klapwijk, Raisa Jofra Hernandez, Michela Vezzoli, Franck Chanut, Rhiannon Lowe, Draghici Elena, Melanie Nord, Paola Albertini, Patrizia Cristofori, Jane Richards, Hazel Staton, Jonathan Appleby, Alessandro Aiuti, Aisha V Sauer
GSK2696273 (autologous CD34+ cells transduced with retroviral vector that encodes for the human adenosine deaminase [ADA] enzyme) is a gamma-retroviral ex vivo gene therapy of bone marrow-derived CD34+ cells for the treatment of adenosine deaminase deficiency severe combined immunodeficiency (ADA-SCID). ADA-SCID is a severe monogenic disease characterized by immunologic and nonimmunologic symptoms. Bone-marrow transplant from a matched related donor is the treatment of choice, but it is available for only a small proportion of patients...
March 2017: Human Gene Therapy. Clinical Development
https://www.readbyqxmd.com/read/28318037/deoxycytidine-and-deoxythymidine-treatment-for-thymidine-kinase-2-deficiency
#3
Carlos Lopez-Gomez, Rebecca J Levy, Maria J Sanchez-Quintero, Marti Juanola-Falgarona, Emanuele Barca, Beatriz Garcia-Diaz, Saba Tadesse, Caterina Garone, Michio Hirano
OBJECTIVE: Thymidine kinase 2 (TK2), a critical enzyme in the mitochondrial pyrimidine salvage pathway, is essential for mitochondrial DNA (mtDNA) maintenance. Mutations in the nuclear gene TK2 cause TK2 deficiency, which manifests predominantly in children as myopathy with mtDNA depletion. Molecular bypass therapy with the TK2 products, dCMP and dTMP, prolongs the lifespan of Tk2-deficient (Tk2(-/-) ) mice by 2-3 fold. Because we observed rapid catabolism of the deoxynucleoside monophosphates to deoxythymidine (dT) and deoxycytidine (dC), we hypothesized that: 1) deoxynucleosides might be the major active agents and 2) inhibition of deoxycytidine deamination might enhance dTMP+dCMP therapy...
March 20, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28315663/enhancing-the-catalytic-deamination-activity-of-apobec3c-is-insufficient-to-inhibit-vif-deficient-hiv-1
#4
Ananda Ayyappan Jaguva Vasudevan, Henning Hofmann, Dieter Willbold, Dieter Häussinger, Bernd W Koenig, Carsten Münk
The retroviral restriction factors of the APOBEC3 (A3) cytidine deaminase family catalyze the deamination of cytidines in single-stranded viral DNA. APOBEC3C (A3C) is a strong antiviral factor against viral infectivity factor (vif)-deficient simian immunodeficiency (SIV) Δvif, however, a weak inhibitor against human immunodeficiency virus (HIV)-1 for reasons unknown. The precise link between the antiretroviral effect of A3C and its catalytic activity is incompletely understood. Here we show that the S61P mutation in human A3C (A3C...
March 15, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28301039/bach2-regulates-aid-mediated-immunoglobulin-gene-conversion-and-somatic-hypermutation-in-dt40-b-cells
#5
Paulina M Budzyńska, Minna K Kyläniemi, Teemu Kallonen, Anni I Soikkeli, Kalle-Pekka Nera, Olli Lassila, Jukka Alinikula
The transcription factor Bach2 is required for germinal centre formation, somatic hypermutation (SHM) and class-switch recombination (CSR) of immunoglobulins. SHM and CSR are initiated by activation-induced cytidine deaminase (AID) which has potential to induce human B cell lymphoma. To understand the role of Bach2 in AID-mediated immunoglobulin gene diversification processes, we established a BACH2-deficient DT40 B cell line. We show that in addition to allowing SHM, Bach2 drives immunoglobulin gene conversion (GCV), another AID-dependent antibody gene diversification process...
March 16, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28298420/staged-induction-of-hiv-1-glycan-dependent-broadly-neutralizing-antibodies
#6
Mattia Bonsignori, Edward F Kreider, Daniela Fera, R Ryan Meyerhoff, Todd Bradley, Kevin Wiehe, S Munir Alam, Baptiste Aussedat, William E Walkowicz, Kwan-Ki Hwang, Kevin O Saunders, Ruijun Zhang, Morgan A Gladden, Anthony Monroe, Amit Kumar, Shi-Mao Xia, Melissa Cooper, Mark K Louder, Krisha McKee, Robert T Bailer, Brendan W Pier, Claudia A Jette, Garnett Kelsoe, Wilton B Williams, Lynn Morris, John Kappes, Kshitij Wagh, Gift Kamanga, Myron S Cohen, Peter T Hraber, David C Montefiori, Ashley Trama, Hua-Xin Liao, Thomas B Kepler, M Anthony Moody, Feng Gao, Samuel J Danishefsky, John R Mascola, George M Shaw, Beatrice H Hahn, Stephen C Harrison, Bette T Korber, Barton F Haynes
A preventive HIV-1 vaccine should induce HIV-1-specific broadly neutralizing antibodies (bnAbs). However, bnAbs generally require high levels of somatic hypermutation (SHM) to acquire breadth, and current vaccine strategies have not been successful in inducing bnAbs. Because bnAbs directed against a glycosylated site adjacent to the third variable loop (V3) of the HIV-1 envelope protein require limited SHM, the V3-glycan epitope is an attractive vaccine target. By studying the cooperation among multiple V3-glycan B cell lineages and their coevolution with autologous virus throughout 5 years of infection, we identify key events in the ontogeny of a V3-glycan bnAb...
March 15, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28285362/purinergic-ecto-enzymes-participate-in-the-thromboregulation-in-acute-in-mice-infection-by-trypanosoma-cruzi
#7
Guilherme M do Carmo, Pedro H Doleski, Mariângela F de Sá, Thirssa H Grando, Nathieli B Bottari, Daniela B R Leal, Lucas T Gressler, Ricardo E Mendes, Lenita M Stefani, Silvia G Monteiro, Aleksandro S Da Silva
Coagulation disorders have been described in Chagas disease with thrombocytopenia as an important event. Several mechanisms may be related to this pathogenesis, such as enzymes of the purinergic system, purine, and receptors involved in the regulation and modulation of physiological events related to hemostasis. Therefore, the aim of this study was to evaluate the activities of E-NTPDase, E-5'nucleotidase, and ecto-adenosine deaminase (E-ADA) in platelets of mice experimentally infected by Trypanosoma cruzi...
March 11, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28283975/a-new-insight-to-adsorption-and-accumulation-of-high-lead-concentration-by-exopolymer-and-whole-cells-of-lead-resistant-bacterium-acinetobacter-junii-l-pb1-isolated-from-coal-mine-dump
#8
Anamika Kushwaha, Radha Rani, Sanjay Kumar, Tarence Thomas, Arun Alfred David, Meraz Ahmed
A lead-resistant bacterial strain was isolated from coal mine dump and identified as Acinetobacter junii Pb1 on basis of 16S rRNA (ribosomal ribonucleic acid) gene sequencing. The minimum inhibitory concentration of lead for the strain was 16,000 mg l(-1) and it showed antibiotic and multi metal resistance. In aqueous culture, at an initial lead (Pb(II)) concentration of 100 and 500 mg l(-1), lead adsorption and accumulation by the isolate was 100 and 60%, at pH 7 at 30 °C after 48 and 120 h, respectively...
March 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28283534/pms2-and-uracil-dna-glycosylases-act-jointly-in-the-mismatch-repair-pathway-to-generate-ig-gene-mutations-at-a-t-base-pairs
#9
Giulia Girelli Zubani, Marija Zivojnovic, Annie De Smet, Olivier Albagli-Curiel, François Huetz, Jean-Claude Weill, Claude-Agnès Reynaud, Sébastien Storck
During somatic hypermutation (SHM) of immunoglobulin genes, uracils introduced by activation-induced cytidine deaminase are processed by uracil-DNA glycosylase (UNG) and mismatch repair (MMR) pathways to generate mutations at G-C and A-T base pairs, respectively. Paradoxically, the MMR-nicking complex Pms2/Mlh1 is apparently dispensable for A-T mutagenesis. Thus, how detection of U:G mismatches is translated into the single-strand nick required for error-prone synthesis is an open question. One model proposed that UNG could cooperate with MMR by excising a second uracil in the vicinity of the U:G mismatch, but it failed to explain the low impact of UNG inactivation on A-T mutagenesis...
March 10, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28278381/alternative-splicing-of-stat3-is-affected-by-rna-editing
#10
Lior Goldberg, Mor Abutbul-Amitai, Gideon Paret, Yael Nevo-Caspi
A-to-I RNA editing, carried out by adenosine deaminase acting on RNA (ADAR) enzymes, is an epigenetic phenomenon of posttranscriptional modifications on pre-mRNA. RNA editing in intronic sequences may influence alternative splicing of flanking exons. We have previously shown that conditions that induce editing result in elevated expression of signal transducer and activator of transcription 3 (STAT3), preferentially the alternatively-spliced STAT3β isoform. Mechanisms regulating alternative splicing of STAT3 have not been elucidated...
March 9, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28276478/b-myb-induces-apobec3b-expression-leading-to-somatic-mutation-in-multiple-cancers
#11
Wen-Cheng Chou, Wei-Ting Chen, Chia-Ni Hsiung, Ling-Yueh Hu, Jyh-Cherng Yu, Huan-Ming Hsu, Chen-Yang Shen
The key signature of cancer genomes is the accumulation of DNA mutations, the most abundant of which is the cytosine-to-thymine (C-to-T) transition that results from cytosine deamination. Analysis of The Cancer Genome Atlas (TCGA) database has demonstrated that this transition is caused mainly by upregulation of the cytosine deaminase APOBEC3B (A3B), but the mechanism has not been completely characterized. We found that B-Myb (encoded by MYBL2) binds the A3B promoter, causing transactivation, and this is responsible for the C-to-T transitions and DNA hypermutation in breast cancer cells...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28275073/rapid-detection-of-cell-free-mycobacterium-tuberculosis-dna-in-tuberculous-pleural-effusion
#12
Nanying Che, Xinting Yang, Zichen Liu, Kun Li, Xiaoyou Chen
Tuberculous pleurisy is one of the most common extra-pulmonary tuberculosis, but its diagnosis remains to be difficult. In this study, we for the first time report detection of cell-free Mycobacterium tuberculosis DNA in pleural effusion and evaluation of this newly developed molecular assay. A total of 78 patients with pleural effusion, 60 patients with tuberculous pleurisy and 18 patients with alternative diseases, were included in this study. Mycobacterial culture, Xpert MTB/RIF assay, adenosine deaminase assay, T-SPOT...
March 8, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28271879/formation-and-determination-of-endogenous-methylated-nucleotides-in-mammals-by-chemical-labeling-coupled-with-mass-spectrometry-analysis
#13
Huan Zeng, Chu-Bo Qi, Ting Liu, Hua-Ming Xiao, Qing-Yun Cheng, Han-Peng Jiang, Bifeng Yuan, Yu-Qi Feng
5-Methylcytosine (5-mC) is an important epigenetic mark that plays critical roles in a variety of cellular pro-cesses. To properly exert physiological functions, the distribution of 5-mC needed to be tightly controlled in both DNA and RNA. In addition to methyltransferase-mediated DNA and RNA methylation, pre-methylated nucleotides can be potentially incorporated into DNA and RNA during replication and transcription. To exclude the pre-modified nucleotides into DNA and RNA, endogenous 5-methyl-2'-deoxycytidine monophosphate (5-Me-dCMP) generated from nucleic acids metabolism can be enzymatically deaminated to thymidine mono-phosphate (TMP)...
March 8, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28266575/cordycepin-disrupts-leukemia-association-with-mesenchymal-stromal-cells-and-eliminates-leukemia-stem-cell-activity
#14
Shu-Man Liang, Yi-Jhu Lu, Bor-Sheng Ko, Yee-Jee Jan, Song-Kun Shyue, Shaw-Fang Yet, Jun-Yang Liou
Maintaining stemness of leukemic stem cells (LSCs) and reciprocal interactions between leukemia and stromal cells support leukemic progression and resistance to chemotherapy. Targeting the niche-based microenvironment is thus a new approach for leukemia therapy. Cordycepin is an analogue of adenosine and has been suggested to possess anti-leukemia properties. However, whether cordycepin influences association of leukemia and mesenchymal stromal cells has never been investigated. Here we show that cordycepin reduces CD34(+)CD38(-) cells in U937 and K562 cells and induces Dkk1 expression via autocrine and paracrine regulation in leukemia and mesenchymal stromal/stem cells (MSCs)...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28261277/gene-therapy-for-primary-immune-deficiencies-a-canadian-perspective
#15
REVIEW
Xiaobai Xu, Chetankumar S Tailor, Eyal Grunebaum
The use of gene therapy (GT) for the treatment of primary immune deficiencies (PID) including severe combined immune deficiency (SCID) has progressed significantly in the recent years. In particular, long-term studies have shown that adenosine deaminase (ADA) gene delivery into ADA-deficient hematopoietic stem cells that are then transplanted into the patients corrects the abnormal function of the ADA enzyme, which leads to immune reconstitution. In contrast, the outcome was disappointing for patients with X-linked SCID, Wiskott-Aldrich syndrome and chronic granulomatous disease who received GT followed by autologous gene corrected transplantations, as many developed hematological malignancies...
2017: Allergy, Asthma, and Clinical Immunology
https://www.readbyqxmd.com/read/28260788/apobec-signature-mutation-generates-an-oncogenic-enhancer-that-drives-lmo1-expression-in-t-all
#16
Z Li, B J Abraham, A Berezovskaya, N Farah, Y Liu, T Leon, A Fielding, S H Tan, T Sanda, A S Weintraub, B Li, S Shen, J Zhang, M R Mansour, R A Young, A T Look
Oncogenic driver mutations are those that provide a proliferative or survival advantage to neoplastic cells resulting in clonal selection. Although most cancer causing mutations have been detected in the protein-coding regions of the cancer genome, driver mutations have recently also been discovered within noncoding genomic sequences. Thus, a current challenge is to gain precise understanding of how these unique genomic elements function in cancer pathogenesis, while clarifying mechanisms of gene regulation and identifying new targets for therapeutic intervention...
March 6, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28260703/streptomyces-cameroonensis-sp-nov-a-geldanamycin-producer-that-promotes-theobroma-cacao-growth
#17
Thaddée Boudjeko, Romaric Armel Mouafo Tchinda, Mina Zitouni, Joëlle Aimée Vera Tchatchou Nana, Sylvain Lerat, Carole Beaulieu
The taxonomy of an actinobacterial strain, designated JJY4(T), was established using a polyphasic approach. JJY4(T) was isolated from the rhizosphere of Chromolaena odorata in Yaoundé (Cameroon) during a project for the selection of biological control agents. Strain JJY4(T) exhibited antimicrobial activities against bacteria, fungi, and oomycetes. Strain JJY4(T) also exhibited the traits of plant growth-promoting rhizobacteria such as the solubilization of inorganic phosphate, production of siderophores and indole-3-acetic acid, and 1-aminocyclopropane-1-carboxylate deaminase activity...
March 4, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28258276/gypenosides-inhibits-xanthine-oxidoreductase-and-ameliorates-urate-excretion-in-hyperuricemic-rats-induced-by-high-cholesterol-and-high-fat-food-lipid-emulsion
#18
Minxia Pang, Yingying Fang, Suhong Chen, Xuexin Zhu, Chaowen Shan, Jie Su, Jingjing Yu, Bo Li, Yao Yang, Bo Chen, Kailun Liang, Huiming Hu, Guiyuan Lv
BACKGROUND The aim of this study was to study the effects of gypenosides (GPS) on lowering uric acid (UA) levels in hyperuricemic rats induced by lipid emulsion (LE) and the related mechanisms. GPS are natural saponins extracted from Gynostemma pentaphyllum. MATERIAL AND METHODS Forty-eight male SD rats were randomly divided into six groups: normal, model, two positive controls, and two GPS treated groups (two different doses of GPS). The normal group rats were fed a basic diet, and the other rats were orally pretreated with LE...
March 4, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28258148/biosynthesis-of-2-chloropentostatin-and-2-amino-2-deoxyadenosine-highlights-a-single-gene-cluster-performing-two-independent-pathways-in-actinomadura-sp-atcc-39365
#19
Yaojie Gao, Gudan Xu, Pan Wu, Jin Liu, You-Sheng Cai, Zixin Deng, Wenqing Chen
2' -chloropentostatin (2' -Cl PTN, 2' -chloro-2' -deoxycoformycin) and 2' -amino-2' -deoxyadenosine (2' -Amino dA) are two adenosine-derived nucleoside antibiotics co-produced by Actinomadura sp. ATCC 39365. 2' -Cl PTN is a potent adenosine deaminase (ADA) inhibitor featuring an intriguing 1,3-diazepine ring as well as a chlorination at C-2' of ribose, and 2' -Amino dA is an adenosine analog showing bioactivity against RNA-type virus infection. However, the biosynthetic logic of them has remained poorly understood...
March 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28257943/photodynamic-therapy-enhances-the-efficacy-of-gene-directed-enzyme-prodrug-therapy
#20
Catherine Christie, Aftin Pomeroy, Rohit Nair, Kristian Berg, Henry Hirschberg
INTRODUCTION: Gene-directed enzyme prodrug therapy (GDEPT) employing the cytosine deaminase (CD) gene, which encodes an enzyme that converts the nontoxic agent 5-fluorocytosine (5-FC) into the chemotherapeutic drug 5-fluorouracil (5-FU), has shown promise both in experimental animals and in clinical trials. Nevertheless, with the transfection systems available presently the percentage of tumor cells incorporating the desired gene is usually too low for successful therapy. We have examined the ability of photodynamic therapy (PDT) to enhance the efficacy of the metabolites, converted from 5-FC by CD gene transfected rat glioma cells...
February 28, 2017: Photodiagnosis and Photodynamic Therapy
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