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14 resultados
[Pharmacology of uridine and cytidine].
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It was established that with intraperitoneal introduction of uridine and cytidine their DL50 for mice equals 5100 and 2700 mg/kg, respectively. In doses of 1/27 and 1/50 of DL50 cytidine reduces by 50 per cent the edema of the rat's paw in a dextran-and formaldehyde-induced inflammation, brings down
Early severe toxicities after capecitabine intake: possible implication of a cytidine deaminase extensive metabolizer profile.
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We report here the case of a 19-year-old female patient who suffered from extremely severe toxicities (G4 mucitis, fever, diarrhea, alteration of general state) while undergoing low-dose capecitabine treatment for her metastatic corticosurrenaloma. The severe toxicities stopped as soon as treatment
Inhibitors of the tick-borne, hemorrhagic fever-associated flaviviruses.
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No antiviral therapies are available for the tick-borne flaviviruses associated with hemorrhagic fevers: Kyasanur Forest disease virus (KFDV), both classical and the Alkhurma hemorrhagic fever virus (AHFV) subtype, and Omsk hemorrhagic fever virus (OHFV). We tested compounds reported to have
Phase I and pharmacologic study of oral (E)-2'-deoxy-2'-(fluoromethylene) cytidine: on a daily x 5-day schedule.
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(E)-2'-deoxy-2'-(fluoromethylene)cytidine (FMdC), one of the most potent inhibitors of ribonucleoside diphosphate reductase, was selected for clinical development because of its novel mechanisms of action, and strong antitumor activity against experimental tumor models. This study was designed to
Characterization of RNA-dependent RNA polymerase activity of CSFV NS5B proteins expressed in Escherichia coli.
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The full-length NS5B protein, and the truncated NS5B proteins of classical swine fever virus (CSFV) resulted from deletion of 24, 36, 65 or 82, amino acid residues at the C terminal were expressed in Escherichia coli cells and purified with a C-terminal hexahistidine tag. In addition to the
Decitabine: a review of its use in older patients with acute myeloid leukaemia.
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Decitabine (Dacogen(®)) is a deoxynucleoside analogue of cytidine that selectively inhibits DNA methyltransferases. Decitabine administered at a dose of 20 mg/m(2) by a 1-h intravenous infusion for 5 consecutive days of a 4-week cycle has been approved by the European Medicines Agency (EMA) for use
Interleukin 6 is a cause of flu-like symptoms in treatment with a deoxycytidine analogue.
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The precise mechanism of fever and flu-like syndrome that occurs in treatment with deoxycytidine analogues remains unclear. This study demonstrated a strong correlation between plasma interleukin 6 levels and fever in treatment with oral (E)-2'-deoxy-2'(fluoromethylene)cytidine, another
Effect of pyrimidine nucleosides on body temperatures of man and rabbit in relation to pharmacokinetic data.
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The effect of high-dose uridine on body temperatures of rabbits and man has been studied in relation to plasma concentrations of uridine and its catabolite uracil. Uridine induced fever in both rabbits and man. High-dose cytidine had no influence on body temperature in rabbits. Plasma concentrations
Inhibition of hepatitis C replicon RNA synthesis by beta-D-2'-deoxy-2'-fluoro-2'-C-methylcytidine: a specific inhibitor of hepatitis C virus replication.
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beta-D-2'-Deoxy-2'-fluoro-2'-C-methylcytidine (PSI-6130) is a cytidine analogue with potent and selective anti-hepatitis C virus (HCV) activity in the subgenomic HCV replicon assay, 90% effective concentration (EC90)=4.6 +/- 2.0 microM. The spectrum of activity and cytotoxicity profile of PSI-6130
Characterization of dengue virus resistance to brequinar in cell culture.
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Brequinar is an inhibitor of dihydroorotate dehydrogenase, an enzyme that is required for de novo pyrimidine biosynthesis. Here we report that brequinar has activity against a broad spectrum of viruses. The compound not only inhibits flaviviruses (dengue virus, West Nile virus, yellow fever virus,
A growth study of Coxiella burnetii Nine Mile Phase I and Phase II in fibroblasts.
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Coxiella burnetii, a slow-growing, gram-negative, obligate intracellular bacterium, is the causative agent of Q fever in humans. The avirulent Phase II C. burnetii Nine Mile strain can invade and establish persistent infections in a wide variety of laboratory cell lines, and is generally considered
In vitro studies of disease-linked variants of human tRNA nucleotidyltransferase reveal decreased thermal stability and altered catalytic activity.
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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
Deficiency of perforin and hCNT1, a novel inborn error of pyrimidine metabolism, associated with a rapidly developing lethal phenotype due to multi-organ failure.
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Pyrimidine nucleotides are essential for a vast number of cellular processes and dysregulation of pyrimidine metabolism has been associated with a variety of clinical abnormalities. Inborn errors of pyrimidine metabolism affecting enzymes in the pyrimidine de novo and degradation pathway have been
Immunoglobulin D enhances immune surveillance by activating antimicrobial, proinflammatory and B cell-stimulating programs in basophils.
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Immunoglobulin D (IgD) is an enigmatic antibody isotype that mature B cells express together with IgM through alternative RNA splicing. Here we report active T cell-dependent and T cell-independent IgM-to-IgD class switching in B cells of the human upper respiratory mucosa. This process required
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