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Hypoxanthine

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https://www.readbyqxmd.com/read/28728407/effects-of-cooking-method-and-final-core-temperature-on-cooking-loss-lipid-oxidation-nucleotide-related-compounds-and-aroma-volatiles-of-hanwoo-brisket
#1
Dicky Tri Utama, Ki Ho Baek, Hae Seong Jeong, Seok Ki Yoon, Seon-Tea Joo, Sung Ki Lee
Objective: This study was performed to observe the effects of cooking method and final core temperature on cooking loss, lipid oxidation, aroma volatiles, nucleotide-related compounds and aroma volatiles of Hanwoo brisket (deep pectoralis). Methods: Deep pectoralis muscles (8.65% of crude fat) were obtained from three Hanwoo steer carcasses with 1+ quality grade. Samples were either oven-roasted at 180°C (dry heat) or cooked in boiling water (moist heat) to final core temperature of 70°C (medium) or 77°C (well-done)...
July 6, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28726179/methionine-and-or-methionine-sulfoxide-alter-ectoenzymes-activities-in-lymphocytes-and-inflammatory-parameters-in-serum-from-young-rats-acute-and-chronic-effects
#2
Mayara Sandrielly Pereira Soares, Marcelo Zanusso Costa, Tatiane Morgana da Silva, Marta Gazal, Carlus Augustu Tavares do Couto, Gabriela Nogueira Debom, Rodrigo Rodrigues, Juliana Hofstätter Azambuja, Emerson André Casali, Cesar Eduardo Jacintho Moritz, Marta Frescura Duarte, Elizandra Braganhol, Francieli Moro Stefanello, Roselia Maria Spanevello
In this study we investigated the effect of acute and chronic treatment with Met and/or methionine sulfoxide (MetO) on ectonucleotidases and cholinesterases activities from lymphocytes and purine derivatives compounds, C-protein reactive, interleukin-10, interleukin-6, and tumor necrosis factor-α levels in serum of young rats. Adenosine triphosphate hydrolysis was decreased in lymphocytes 1 h after treatment by MetO and Met + MetO. However, adenosine triphosphate and adenosine diphosphate hydrolysis in lymphocytes was increased in the groups MetO and Met + MetO and adenosine deaminase activity was increased in MetO 3 h after the treatment...
July 19, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28719312/molecular-epidemiology-of-malaria-in-cameroon-and-c%C3%A3-te-d-ivoire-xxxi-kelch-13-propeller-sequences-in-plasmodium-falciparum-isolates-before-and-after-implementation-of-artemisinin-based-combination-therapy
#3
Joseph Allico Djaman, Dagnogo Olefongo, Aristide Berenger Ako, Jocelyne Roman, Vincent Foumane Ngane, Leonardo K Basco, Rachida Tahar
Artemisinin-resistant malaria has not been reported from Africa, but resistance can possibly spread from Asia or arise independently in Africa. The emergence of artemisinin resistance in Africa can be monitored by molecular assay of Kelch 13 (K13) propeller sequences. A total of 251 archived DNA samples of Plasmodium falciparum isolates collected in 2002, 2003, and 2006 in Yaounde, Cameroon, and 47 samples collected in 2006 and 2013 in Abidjan, Côte d'Ivoire, were analyzed for K13-propeller sequence polymorphism...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28717030/intestinal-epithelial-ecto-5-nucleotidase-cd73-regulates-intestinal-colonization-and-infection-by-nontyphoidal-salmonella
#4
Daniel J Kao, Bejan J Saeedi, David Kitzenberg, Krista M Burney, Evgenia Dobrinskikh, Kayla D Battista, Andrés Vázquez-Torres, Sean P Colgan, Douglas J Kominsky
Ecto-5' -nucleotidase (CD73) is expressed abundantly on the apical surface of intestinal epithelial cells (IEC) and functions as the terminal enzyme in the generation of extracellular adenosine. Previous work has demonstrated that adenosine signaling in IECs results in a number of tissue-protective effects during inflammation; however, a rationale for its apical expression has been lacking. We hypothesized that the highly polarized expression of CD73 is indicative of an important role for extracellular adenosine as a mediator of host-microbe interactions...
July 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28716914/metabolic-profiles-of-exercise-in-patients-with-mcardle-disease-or-mitochondrial-myopathy
#5
Nigel F Delaney, Rohit Sharma, Laura Tadvalkar, Clary B Clish, Ronald G Haller, Vamsi K Mootha
McArdle disease and mitochondrial myopathy impair muscle oxidative phosphorylation (OXPHOS) by distinct mechanisms: the former by restricting oxidative substrate availability caused by blocked glycogen breakdown, the latter because of intrinsic respiratory chain defects. We applied metabolic profiling to systematically interrogate these disorders at rest, when muscle symptoms are typically minimal, and with exercise, when symptoms of premature fatigue and potential muscle injury are unmasked. At rest, patients with mitochondrial disease exhibit elevated lactate and reduced uridine; in McArdle disease purine nucleotide metabolites, including xanthine, hypoxanthine, and inosine are elevated...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28708419/mechanisms-of-the-formation-of-adenine-guanine-and-their-analogues-in-uv-irradiated-mixed-nh3-h2o-molecular-ices-containing-purine
#6
Partha P Bera, Tamar Stein, Martin Head-Gordon, Timothy J Lee
We investigated the formation mechanisms of the nucleobases adenine and guanine and the nucleobase analogues hypoxanthine, xanthine, isoguanine, and 2,6-diaminopurine in a UV-irradiated mixed 10:1 H2O:NH3 ice seeded with precursor purine by using ab initio and density functional theory computations. Our quantum chemical investigations suggest that a multistep reaction mechanism involving purine cation, hydroxyl and amino radicals, together with water and ammonia, explains the experimentally obtained products in an independent study...
July 14, 2017: Astrobiology
https://www.readbyqxmd.com/read/28704682/mutagenic-potential-of-hypoxanthine-in-live-human-cells
#7
Stephen DeVito, Jordan Woodrick, Linze Song, Rabindra Roy
Hypoxanthine (Hx) is a major DNA lesion generated by deamination of adenine during chronic inflammatory conditions, which is an underlying cause of various diseases including cancer of colon, liver, pancreas, bladder and stomach. There is evidence that deamination of DNA bases induces mutations, but no study has directly linked Hx accumulation to mutagenesis and strand-specific mutations yet in human cells. Using a site-specific mutagenesis approach, we report the first direct evidence of mutation potential and pattern of Hx in live human cells...
June 28, 2017: Mutation Research
https://www.readbyqxmd.com/read/28682064/a-very-rare-example-of-a-structurally-characterized-3-gmp-metal-complex-nmr-and-synthetic-assessment-of-adducts-formed-by-guanine-derivatives-with-pt-l-tri-cl-cl-complexes-with-an-n-n-n%C3%A2-tridentate-ligand-l-tri-terminated-by-imidazole-rings
#8
Kokila Ranasinghe, Svetlana Pakhomova, Patricia A Marzilli, Luigi G Marzilli
[Pt(N(R)-1,1'-Me2dma)Cl]Cl complexes with tridentate ligands (bis(1-methyl-2-methylimidazolyl)amine, R = H; N-(methyl)bis(1-methyl-2-methylimidazolyl)amine, R = Me) were prepared in order to investigate Pt(N(R)-1,1'-Me2dma)G adducts (G = monodentate N9-substituted guanine or hypoxanthine derivative). Solution NMR spectroscopy is the primary tool for studying metal complexes of nucleosides and nucleotides because such adducts rarely crystallize. However, [Pt(N(H)-1,1'-Me2dma)(3'-GMPH)]NO3·5H2O (5) was crystallized, allowing, to our knowledge, the first crystallographic molecular structure determination for a 3'-GMP platinum complex...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28671969/reference-gene-selection-for-the-shell-gland-of-laying-hens-in-response-to-time-points-of-eggshell-formation-and-nicarbazin
#9
Sami Samiullah, Juliet Roberts, Shu-Biao Wu
Ten reference genes were investigated for normalization of gene expression data in the shell gland of laying hens. Analyses performed with geNorm revealed that hypoxanthine phosphoribosyltransferase 1 (HPRT1) and hydroxymethylbilane synthase (HMBS) were the two most stable reference genes in response to post-oviposition time alone (POT) or with nicarbazin treatment (POT+N) of laying hens. NormFinder analyses showed that the two most stable reference genes in response to POT and POT+N were 18S ribosomal RNA (18S rRNA), ribosomal protein L4 (RPL4) and HMBS, RPL4, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28666380/comparative-analysis-of-chimeric-zfp-tale-and-cas9-piggybac-transposases-for-integration-into-a-single-locus-in-human-cells
#10
Wentian Luo, Daniel L Galvan, Lauren E Woodard, Dan Dorset, Shawn Levy, Matthew H Wilson
Integrating DNA delivery systems hold promise for many applications including treatment of diseases; however, targeted integration is needed for improved safety. The piggyBac (PB) transposon system is a highly active non-viral gene delivery system capable of integrating defined DNA segments into host chromosomes without requiring homologous recombination. We systematically compared four different engineered zinc finger proteins (ZFP), four transcription activator-like effector proteins (TALE), CRISPR associated protein 9 (SpCas9) and the catalytically inactive dSpCas9 protein fused to the amino-terminus of the transposase enzyme designed to target the hypoxanthine phosphoribosyltransferase (HPRT) gene located on human chromosome X...
June 29, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28648005/-components-of-human-placental-extract-and-its-protective-effect-to-rat-from-d-galn-induced-acute-liver-injury
#11
H Q Lei, M L Cheng, J Li, P P Zhou, X H Luo, F Yu
Objective: To evaluate the effect of human placental extracts (HPE) on the protection from acute liver injury (ALI) induced by D-GalN and analyze the components of HPE. Methods: (1)Fourty male mice were randomly divided into five groups (Blank, Model, MgIG, HPE and HPE+ MgIG) for the ALI model and treatments.The serum alanine aminotransferase (ALT) and aspartate transaminase (AST) were determined by biochemical assays.Nitric monoxide (NO), malondialdehyde (MDA), superoxide dismutase (SOD), total antioxidant capacity (T-AOC) in serum and hepatic tissue were detected by assay kits...
June 20, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28640361/global-and-targeted-serum-metabolic-profiling-of-colorectal-cancer-progression
#12
Yin Long, Beatriz Sanchez-Espiridion, Moubin Lin, Lindsey White, Lopa Mishra, Gottumakkala S Raju, Scott Kopetz, Cathy Eng, Michelle A T Hildebrandt, David W Chang, Yuanqing Ye, Dong Liang, Xifeng Wu
BACKGROUND: Patients with colorectal adenoma polyps (PLPs) are at higher risk for developing colorectal cancer (CRC). However, the development of improved and robust biomarkers to enable the screening, surveillance, and early detection of PLPs and CRC continues to be a challenge. The aim of this study was to identify biomarkers of progression to CRC through metabolomic profiling of human serum samples with a multistage approach. METHODS: Metabolomic profiling was conducted with the Metabolon platform for 30 CRC patients, 30 PLP patients, and 30 control subjects, and this was followed by the targeted validation of the top metabolites in an additional set of 50 CRC patients, 50 PLP patients, and 50 controls with liquid chromatography-tandem mass spectrometry...
June 22, 2017: Cancer
https://www.readbyqxmd.com/read/28628279/acyclic-nucleoside-phosphonates-containing-9-deazahypoxanthine-and-a-five-membered-heterocycle-as-selective-inhibitors-of-plasmodial-6-oxopurine-phosphoribosyltransferases
#13
Martin Maxmilian Kaiser, Ondřej Baszczyňski, Dana Hocková, Lenka Poštová-Slavětínská, Martin Dračínský, Dianne T Keough, Luke W Guddat, Zlatko Janeba
Acyclic nucleoside phosphonates (ANPs) are an important class of therapeutic drugs that act as antiviral agents by inhibiting viral DNA polymerases and reverse transcriptases. ANPs containing a 6-oxopurine unit instead of a 6-aminopurine or pyrimidine base are inhibitors of the purine salvage enzyme, hypoxanthine-guanine-[xanthine] phosphoribosyltransferase (HG[X]PRT). Such compounds, and their prodrugs, are able to arrest the growth of Plasmodium falciparum (Pf) in cell culture. A new series of ANPs were synthesized and tested as inhibitors of human HGPRT, PfHGXPRT, and Plasmodium vivax (Pv) HGPRT...
June 19, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28628181/synthesis-and-antiviral-evaluation-of-base-modified-deoxythreosyl-nucleoside-phosphonates
#14
Chao Liu, Shrinivas G Dumbre, Christophe Pannecouque, Brent Korba, Steven De Jonghe, Piet Herdewijn
l-α-2'-Deoxythreosyl nucleoside phosphonates and their phosphonodiamidate prodrugs with a hypoxanthine, 2,6-diaminopurine, 2-amino-6-cyclopropylaminopurine, 7-deazaadenine, 5-fluorouracil and 5-methylcytosine heterocycle as a nucleobase were synthesized and evaluated for their inhibitory activity against HIV and HBV. The 2,6-diaminopurine modified analogue 23a displayed the most potent activity against HIV, with an EC50 value of 11.17 μM against HIV-1 (IIIB) and an EC50 value of 8.15 μM against HIV-2 (ROD)...
July 5, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28615843/in-vitro-adaptability-of-plasmodium-falciparum-to-different-fresh-serum-alternatives
#15
Chandrajit Dohutia, Pradyumna K Mohapatra, Dibya Ranjan Bhattacharyya, Kabita Gogoi, Khukumoni Bora, Basanta K Goswami
To reduce the dependency on fresh AB(+) serum in continuous culture of Plasmodium falciparum, a comparative study was undertaken to assess the in vitro adaptability of P. falciparum to media supplemented with fresh AB(+) serum from whole blood, AB(+) plasma, serum derived from AB(+) plasma, AB(+) human serum from Sigma, Albumax II, fetal bovine serum and new born calf serum, independently and in different combinations. Combinations were used to analyze whether two different substitutes demonstrate any synergistic effect on the growth of the parasites...
June 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28602601/association-of-amine-biomarkers-with-incident-dementia-and-alzheimer-s-disease-in-the-framingham-study
#16
Vincent Chouraki, Sarah R Preis, Qiong Yang, Alexa Beiser, Shuo Li, Martin G Larson, Galit Weinstein, Thomas J Wang, Robert E Gerszten, Ramachandran S Vasan, Sudha Seshadri
INTRODUCTION: The identification of novel biomarkers associated with Alzheimer's disease (AD) could provide key biological insights and permit targeted preclinical prevention. We investigated circulating metabolites associated with incident dementia and AD using metabolomics. METHODS: Plasma levels of 217 metabolites were assessed in 2067 dementia-free Framingham Offspring Cohort participants (mean age = 55.9 ± 9.7 years; 52.4% women). We studied their associations with future dementia and AD risk in multivariate Cox models...
June 8, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28601510/synthesis-and-evaluation-of-symmetric-acyclic-nucleoside-bisphosphonates-as-inhibitors-of-the-plasmodium-falciparum-plasmodium-vivax-and-human-6-oxopurine-phosphoribosyltransferases-and-the-antimalarial-activity-of-their-prodrugs
#17
Petr Špaček, Dianne T Keough, Marina Chavchich, Martin Dračínský, Zlatko Janeba, Lieve Naesens, Michael D Edstein, Luke W Guddat, Dana Hocková
Two new series of symmetric acyclic nucleoside bisphosphonates (ANbPs) have been synthesised as potential inhibitors of the Plasmodium falciparum (Pf) and vivax (Pv) 6-oxopurine phosphoribosyltransferases. The structural variability between these symmetric ANbPs lies in the number of atoms in the two acyclic linkers connecting the N(9) atom of the purine base to each of two phosphonate groups and the branching point of the acyclic moiety relative to the purine base, which occurs at either the alpha or beta positions...
May 24, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28593435/hypoxanthine-induces-neuroenergetic-impairment-and-cell-death-in-striatum-of-young-adult-wistar-rats
#18
Helena Biasibetti-Brendler, Felipe Schmitz, Paula Pierozan, Bruna S Zanotto, Caroline A Prezzi, Rodrigo Binkowski de Andrade, Clovis M D Wannmacher, Angela T S Wyse
Hypoxanthine is the major purine involved in the salvage pathway of purines in the brain. High levels of hypoxanthine are characteristic of Lesch-Nyhan Disease. Since hypoxanthine is a purine closely related to ATP formation, the aim of this study was to investigate the effect of intrastriatal hypoxanthine administration on neuroenergetic parameters (pyruvate kinase, succinate dehydrogenase, complex II, cytochrome c oxidase, and ATP levels) and mitochondrial function (mitochondrial mass and membrane potential) in striatum of rats...
June 7, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28591185/selection-of-suitable-endogenous-reference-genes-for-qpcr-in-kidney-and-hypothalamus-of-rats-under-testosterone-influence
#19
Khadijeh Gholami, Su Yi Loh, Naguib Salleh, Sau Kuen Lam, See Ziau Hoe
Real-time quantitative PCR (qPCR) is the most reliable and accurate technique for analyses of gene expression. Endogenous reference genes are being used to normalize qPCR data even though their expression may vary under different conditions and in different tissues. Nonetheless, verification of expression of reference genes in selected studied tissue is essential in order to accurately assess the level of expression of target genes of interest. Therefore, in this study, we attempted to examine six commonly used reference genes in order to identify the gene being expressed most constantly under the influence of testosterone in the kidneys and hypothalamus...
2017: PloS One
https://www.readbyqxmd.com/read/28583948/lysinibacillus-fusiformis-m5-induces-increased-complexity-in-bacillus-subtilis-168-colony-biofilms-via-hypoxanthine
#20
Ramses Gallegos-Monterrosa, Stefanie Kankel, Sebastian Götze, Robert Barnett, Pierre Stallforth, Ákos T Kovács
In recent years, biofilms have become a central subject of research in the fields of microbiology, medicine, agriculture, or systems biology amongst others. The sociomicrobiology of multispecies biofilms, however, is still poorly understood. Here, we report a screening system that allowed us to identify soil bacteria, which induce architectural changes in biofilm colonies when cocultured with B. subtilis We identified the soil bacterium Lysinibacillus fusiformis M5 as inducer of wrinkle-formation in B. subtilis colonies mediated by a diffusible signaling molecule...
June 5, 2017: Journal of Bacteriology
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