Search results for "Uridine"

showing 10 items of 142 documents

Reply

2015

Antiviral AgentSettore MED/12 - GastroenterologiaHepatologybusiness.industryMedicineHepatitis C ChronicbusinessUridine MonophosphateHuman
researchProduct

Neuronal cell cycle: the neuron itself and its circumstances.

2015

Neurons are usually regarded as postmitotic cells that undergo apoptosis in response to cell cycle reactivation. Nevertheless, recent evidence indicates the existence of a defined developmental program that induces DNA replication in specific populations of neurons, which remain in a tetraploid state for the rest of their adult life. Similarly, de novo neuronal tetraploidization has also been described in the adult brain as an early hallmark of neurodegeneration. The aim of this review is to integrate these recent developments in the context of cell cycle regulation and apoptotic cell death in neurons. We conclude that a variety of mechanisms exists in neuronal cells for G1/S and G2/M check…

ApoptosisBrdU 5-bromo-2′-deoxyuridineReviewp75NTR neurotrophin receptor p75Nervous SystemG0 quiescent stateCKI Cdk-inhibitorNeuronsCell DeathNeurodegenerationCell CycleapoptosisNeurodegenerative DiseasesCell cycleCell biologymedicine.anatomical_structureInk inhibitor of kinaseBDNF brain-derived neurotrophic factorp38MAPK p38 mitogen-activated protein kinaseG2 growth phase 2Programmed cell deathS-phasePD Parkinson diseaseRb RetinoblastomaMcm2 minichromosome maintenance 2PCNA proliferating cell nuclear antigenMitosisContext (language use)BiologyCdk cyclin-dependent kinaseCNS central nervous systemS-phase synthesis phase.Cip/Kip cyclin inhibitor protein/kinase inhibitor proteinmedicineAnimalsHumansMolecular BiologyMitosisTetraploidAD Alzheimer diseasecell cycle re-entryDNA replicationCell BiologyNeuronmedicine.diseaseG1 growth phase 1neuronRGCs retinal ganglion cellsCell cycle re-entrytetraploidnervous systemApoptosisNeuronDevelopmental BiologyCell cycle (Georgetown, Tex.)
researchProduct

Pharmacological blockade of the fatty acid amide hydrolase (FAAH) alters neural proliferation, apoptosis and gliosis in the rat hippocampus, hypothal…

2015

Endocannabinoids participate in the control of neurogenesis, neural cell death and gliosis. The pharmacological effect of the fatty acid amide hydrolase (FAAH) inhibitor URB597, which limits the endocannabinoid degradation, was investigated in the present study. Cell proliferation (phospho-H3(+) or BrdU(+) cells) of the main adult neurogenic zones as well as apoptosis (cleaved caspase-3(+)), astroglia (GFAP(+)), and microglia (Iba1(+) cells) were analyzed in the hippocampus, hypothalamus and striatum of rats intraperitoneally treated with URB597 (0.3 mg/kg/day) at one dose/4-days resting or 5 doses (1 dose/day). Repeated URB597 treatment increased the plasma levels of the N-acylethanolamine…

AstrocitosNeurobiologia del desenvolupamentAmidohidrolasasCannabinoid receptorCarbamatos:Chemicals and Drugs::Amino Acids Peptides and Proteins::Proteins::Intracellular Signaling Peptides and Proteins::Apoptosis Regulatory Proteins::Caspases [Medical Subject Headings]:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Differentiation::Neurogenesis [Medical Subject Headings]medicine.medical_treatment:Chemicals and Drugs::Carbohydrates::Monosaccharides::Hexoses::Glucose [Medical Subject Headings]Apoptosis:Phenomena and Processes::Physiological Phenomena::Body Constitution::Body Weights and Measures::Body Size::Body Weight [Medical Subject Headings]chemistry.chemical_compound:Chemicals and Drugs::Amino Acids Peptides and Proteins::Proteins::Membrane Proteins::Receptors Cell Surface::Receptors G-Protein-Coupled::Receptors Cannabinoid::Receptor Cannabinoid CB1 [Medical Subject Headings]0302 clinical medicine:Chemicals and Drugs::Organic Chemicals::Carboxylic Acids::Acids Acyclic::Carbamates [Medical Subject Headings]Fatty acid amide hydrolaseReceptor cannabinoide CB1:Organisms::Eukaryota::Animals [Medical Subject Headings]FAAHGliosishealth care economics and organizations:Chemicals and Drugs::Nucleic Acids Nucleotides and Nucleosides::Nucleosides::Deoxyribonucleosides::Deoxyuridine::Bromodeoxyuridine [Medical Subject Headings]:Chemicals and Drugs::Lipids::Glycerides::Triglycerides [Medical Subject Headings]Original Research0303 health sciencesNeurogenesisBenzamidas:Chemicals and Drugs::Polycyclic Compounds::Steroids::Cholestanes::Cholestenes::Cholesterol [Medical Subject Headings]Endocannabinoid systemEtanolaminas3. Good healthEndocannabinoides:Chemicals and Drugs::Lipids::Fatty Acids::Fatty Acids Unsaturated::Fatty Acids Monounsaturated::Oleic Acids [Medical Subject Headings]CannabinoidesMicroglíalipids (amino acids peptides and proteins)medicine.symptomColesterol:Chemicals and Drugs::Organic Chemicals::Hydrocarbons::Terpenes::Cannabinoids [Medical Subject Headings]:Chemicals and Drugs::Lipids::Fatty Acids::Palmitic Acids [Medical Subject Headings]psychological phenomena and processesProliferación celularmedicine.medical_specialtyCerebroNeurogenesiseducationBiologyBromodesoxiuridina:Anatomy::Nervous System::Neuroglia::Microglia [Medical Subject Headings]Triglicéridoslcsh:RC321-571Ácidos oléicosRatas03 medical and health sciencesCellular and Molecular NeuroscienceInternal medicineHipocampomedicineCaspasa 3:Anatomy::Nervous System::Central Nervous System::Brain::Limbic System::Hippocampus [Medical Subject Headings]:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Growth Processes::Cell Proliferation [Medical Subject Headings]lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry030304 developmental biologyPalmitoylethanolamide:Chemicals and Drugs::Chemical Actions and Uses::Pharmacologic Actions::Molecular Mechanisms of Pharmacological Action::Neurotransmitter Agents::Endocannabinoids [Medical Subject Headings]:Chemicals and Drugs::Enzymes and Coenzymes::Enzymes::Hydrolases::Amidohydrolases [Medical Subject Headings]Cannabinoids:Anatomy::Cells::Neuroglia::Astrocytes [Medical Subject Headings]Peso corporalEnergy metabolism:Anatomy::Nervous System::Central Nervous System::Brain [Medical Subject Headings]:Anatomy::Nervous System::Central Nervous System::Brain::Limbic System::Hypothalamus [Medical Subject Headings]URB597:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Death [Medical Subject Headings]:Diseases::Pathological Conditions Signs and Symptoms::Pathologic Processes::Gliosis [Medical Subject Headings]:Chemicals and Drugs::Organic Chemicals::Amines::Amino Alcohols::Ethanolamines [Medical Subject Headings]Muerte celular:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Death::Apoptosis [Medical Subject Headings]:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Rodentia::Muridae::Murinae::Rats [Medical Subject Headings]EndocrinologyURB597chemistryGliosisnervous systemGlucosaCannabinoidEnergy Metabolism:Chemicals and Drugs::Organic Chemicals::Amides::Benzamides [Medical Subject Headings]HipotálamoÁcidos palmíticos030217 neurology & neurosurgeryNeuroscienceFrontiers in Cellular Neuroscience
researchProduct

A comparative biochemical, pharmacological and immunological study of Clostridium novyi alpha-toxin, C. difficile toxin B and C. sordellii lethal tox…

1991

The three clostridial cytotoxins, i.e. alpha-toxin of C. novyi (Tox alpha-nov), toxin B of C. difficile (ToxB-dif) and lethal toxin of C. sordellii (LT-sor) consist of single peptide chains of about 200,000 (Tox alpha-nov), 250,000 (LT-sor) and 275,000 (ToxB-dif) mol. wts. ToxB-dif and LT-sor but not Tox alpha-nov cross-reacted with rabbit polyclonal antibodies. Toxicity upon i.v. injection in mice was similar (LD50, 100 hr, 50-200 ng/kg) and was characterized by a slowly developing fluid loss into the interstitial space. When injected into the rat paw the toxins caused a delayed local edema lasting for days. In vitro the three toxins provoked a persistent retraction of endothelial cells cu…

Bacterial ToxinsClostridium sordelliiClostridium difficile toxin BChick EmbryoBiologyPulmonary ArteryToxicologymedicine.disease_causeMedian lethal doseMicrobiologyLethal Dose 50chemistry.chemical_compoundMiceBacterial ProteinsmedicineAnimalsMicroscopy Phase-ContrastUridineCells CulturedClostridiumAdenosine Diphosphate RiboseToxinClostridioides difficileCytotoxinsRats Inbred Strainsbiology.organism_classificationClostridium novyiUridineRatsEndothelial stem cellchemistryADP-ribosylationPotassiumFemaleEndothelium VascularToxicon : official journal of the International Society on Toxinology
researchProduct

Regulatory factor for the transcription of the ribosomal genes in amphibian oocytes.

1970

AMPHIBIAN oocytes provide very convenient material for the study of the mechanisms that control ribosomal RNA synthesis because their pattern of ribosomal RNA synthesis does not change greatly during oogenesis. During the lampbrush stage of oogenesis (stage 4) more than 97 per cent of the RNA synthesized per unit time in the oocytes is ribosomal. This happens because the genes for ribosomal RNA are specifically amplified3–5 to such an extent that the oocyte nucleus (germinal vesicle) has an rDNA content approximately 1,500 times more than the haploid amount4. On the other hand, in mature oocytes (stage 6) no ribosomal RNA is synthesized1,2, although the extra copies of the ribosomal cistron…

BiologyTritiumRibosomeTranscription (biology)Genes RegulatorAnimalsGeneUridineOvumCarbon IsotopesMultidisciplinaryGerminal vesicleRNARibosomal RNAGenetic codeChromatography Ion ExchangeMolecular biologyCell biologyNeurulaGenetic Codeembryonic structuresRNAFemaleAnuraRibosomesProtein BindingNature
researchProduct

UDP-glucosyltransferase activity toward exogenous substrates in Drosophila melanogaster.

1991

To investigate the capacity of Drosophila extracts to glucosylate exogenous substrates we have developed a fast and sensitive method for the detection of UDP-glucosyltransferase activity using 4-nitrophenol, 1-naphthol, or 2-naphthol as substrates. High-performance liquid chromatography was used to separate and quantitate the reaction products, allowing detection of activities that produced as little as 1 pmol of 2-naphthol glucoside (fluorescence detection) or 16 pmol of 4-nitrophenol glucoside (absorbance detection). Optimal activity was found at 43 degrees C and alkaline pH. The affinity of the Drosophila enzyme was 250-fold higher for 1-naphthol or 2-naphthol (Km approximately 4 microM)…

BiophysicsNaphtholsBiochemistryHigh-performance liquid chromatographyUridine DiphosphateSubstrate SpecificityAbsorbanceNitrophenolschemistry.chemical_compoundGlucosideDrosophilidaeAnimalsMolecular BiologyChromatography High Pressure Liquidchemistry.chemical_classificationChromatographybiologySubstrate (chemistry)Cell BiologyHydrogen-Ion Concentrationbiology.organism_classificationFluorescenceEnzymeDrosophila melanogasterchemistryBiochemistryGlucosyltransferasesDrosophila melanogasterAnalytical biochemistry
researchProduct

Hematopoietic Stem Cells Reversibly Switch from Dormancy to Self-Renewal during Homeostasis and Repair

2008

Bone marrow hematopoietic stem cells (HSCs) are crucial to maintain lifelong production of all blood cells. Although HSCs divide infrequently, it is thought that the entire HSC pool turns over every few weeks, suggesting that HSCs regularly enter and exit cell cycle. Here, we combine flow cytometry with label-retaining assays (BrdU and histone H2B-GFP) to identify a population of dormant mouse HSCs (d-HSCs) within the lin(-)Sca1(+)cKit(+)CD150(+)CD48(-)CD34(-) population. Computational modeling suggests that d-HSCs divide about every 145 days, or five times per lifetime. d-HSCs harbor the vast majority of multilineage long-term self-renewal activity. While they form a silent reservoir of th…

BromouracilProliferationCellCD34CELLCYCLEQuiescenceSelf renewalMice0302 clinical medicineLongBone MarrowHomeostasisCancereducation.field_of_study0303 health sciencesProgenitor Cellshemic and immune systemsCell cycleCell biologyAdult Stem CellsHaematopoiesismedicine.anatomical_structure030220 oncology & carcinogenesisFluorouracilStem cellGreen Fluorescent ProteinsPopulationMice TransgenicCycleBiologyGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciencesmedicineAnimalsProgenitor celleducationUridine030304 developmental biologyMouse ModelBiochemistry Genetics and Molecular Biology(all)Osteoblastic NicheHematopoietic Stem CellsSTEMCELLAntigens DifferentiationMarrowIn-VitroImmunologyDormancyBone marrowHomeostasisCell
researchProduct

Chemical speciation of nucleotide 5′-monophosphates in the presence of biogenic amines

2001

The interaction of adenosine-, uridine-, inosine- and guanosine-5’-monophosphates with protonated ethylenediamine, putrescine, cadaverine, spermidine and spermine, was studied potentiometrically, a...

CadaverineChemical Health and SafetyStereochemistryHealth Toxicology and MutagenesisSpermineEthylenediamineToxicologyMedicinal chemistryBiogenic PolyaminesUridineSpermidinechemistry.chemical_compoundchemistrynucleotide 5′-monophosphates; biogenic polyamines; nucleotide 5′-monophosphate-polyammonium cation complexes; speciationmedicinePutrescineInosinemedicine.drug
researchProduct

Absolute and relative quantification of RNA modifications via biosynthetic isotopomers

2014

In the resurging field of RNA modifications, quantification is a bottleneck blocking many exciting avenues. With currently over 150 known nucleoside alterations, detection and quantification methods must encompass multiple modifications for a comprehensive profile. LC-MS/MS approaches offer a perspective for comprehensive parallel quantification of all the various modifications found in total RNA of a given organism. By feeding (13)C-glucose as sole carbon source, we have generated a stable isotope-labeled internal standard (SIL-IS) for bacterial RNA, which facilitates relative comparison of all modifications. While conventional SIL-IS approaches require the chemical synthesis of single mod…

Carbon IsotopesTandem Mass SpectrometryEscherichia coli500 Natural sciences and mathematicsMethods OnlineRNANucleosides500 NaturwissenschaftenReference Standards13PseudouridineChromatography LiquidNucleic Acids Research
researchProduct

Uridine enhances the cytotoxic effect of D-glucosamine in rat C6 glioma cells.

1986

This paper studies the influence of uridine on the effects exerted by D-glucosamine in rat C6 glioma cells. 2 mM uridine increased markedly both the cytotoxic effect of the aminosugar and the inhibition of thymidine incorporation into acid-insoluble fraction. Furthermore the complete resumption of the capacity to incorporate either 3H-thymidine or 3H-mannose which was observed after the removal of the aminosugar, was impeded when the cells were treated contemporaneously with D-glucosamine and uridine. An exposure for 4 hr to 20 mM glucosamine alone enhanced about 15-fold the cellular pool of UDP-N-acetylhexosamines; the addition of 2 mM uridine intensified the expansion of this pool, which …

Cell SurvivalBiologyC6 gliomaGeneral Biochemistry Genetics and Molecular BiologyCell Linechemistry.chemical_compoundGlucosamineGliomamedicineCytotoxic T cellAnimalsGeneral Pharmacology Toxicology and PharmaceuticsCytotoxicityUridineGlucosamineUridine Diphosphate N-AcetylglucosamineDrug SynergismGeneral MedicineGliomamedicine.diseaseMolecular biologyUridineIn vitroRatsBiochemistrychemistryAminosugarcytotoxic effectMannoseThymidineLife sciences
researchProduct