A pyrimidine nucleoside analog that is used mainly in the treatment of leukemia, especially acute non-lymphoblastic leukemia. Cytarabine is an antimetabolite antineoplastic agent that inhibits the synthesis of DNA. Its actions are specific for the S phase of the cell cycle. It also has antiviral and immunosuppressant properties. (From Martindale, The Extra Pharmacopoeia, 30th ed, p472)
Within a eukaryotic cell, a membrane-limited body which contains chromosomes and one or more nucleoli (CELL NUCLEOLUS). The nuclear membrane consists of a double unit-type membrane which is perforated by a number of pores; the outermost membrane is continuous with the ENDOPLASMIC RETICULUM. A cell may contain more than one nucleus. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)
A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).
A nucleoside antibiotic isolated from Streptomyces antibioticus. It has some antineoplastic properties and has broad spectrum activity against DNA viruses in cell cultures and significant antiviral activity against infections caused by a variety of viruses such as the herpes viruses, the VACCINIA VIRUS and varicella zoster virus.
Leukemia, Myeloid, Acute
Dose-Response Relationship, Drug
A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.
DNA Polymerase II
A DNA-dependent DNA polymerase characterized in E. coli and other lower organisms. It may be present in higher organisms and has an intrinsic molecular activity only 5% of that of DNA Polymerase I. This polymerase has 3'-5' exonuclease activity, is effective only on duplex DNA with gaps or single-strand ends of less than 100 nucleotides as template, and is inhibited by sulfhydryl reagents. EC 18.104.22.168.
DNA-Directed DNA Polymerase
DNA-dependent DNA polymerases found in bacteria, animal and plant cells. During the replication process, these enzymes catalyze the addition of deoxyribonucleotide residues to the end of a DNA strand in the presence of DNA as template-primer. They also possess exonuclease activity and therefore function in DNA repair.
DNA Polymerase I
A DNA-dependent DNA polymerase characterized in prokaryotes and may be present in higher organisms. It has both 3'-5' and 5'-3' exonuclease activity, but cannot use native double-stranded DNA as template-primer. It is not inhibited by sulfhydryl reagents and is active in both DNA synthesis and repair. EC 22.214.171.124.
Prince Edward Island
An island in the Gulf of St. Lawrence constituting a province of Canada in the eastern part of the country. It is very irregular in shape with many deep inlets. Its capital is Charlottetown. Discovered by the French in 1534 and originally named Ile Saint-Jean, it was renamed in 1799 in honor of Prince Edward, fourth son of George III and future father of Queen Victoria. (From Webster's New Geographical Dictionary, 1988, p981 & Room, Brewer's Dictionary of Names, 1992, p433)
District of Columbia
Critical and exhaustive investigation or experimentation, having for its aim the discovery of new facts and their correct interpretation, the revision of accepted conclusions, theories, or laws in the light of newly discovered facts, or the practical application of such new or revised conclusions, theories, or laws. (Webster, 3d ed)
Typhus, Endemic Flea-Borne
Encyclopedias as Topic
It is a form of protection provided by law. In the United States this protection is granted to authors of original works of authorship, including literary, dramatic, musical, artistic, and certain other intellectual works. This protection is available to both published and unpublished works. (from Circular of the United States Copyright Office, 6/30/2008)
Protective measures against unauthorized access to or interference with computer operating systems, telecommunications, or data structures, especially the modification, deletion, destruction, or release of data in computers. It includes methods of forestalling interference by computer viruses or so-called computer hackers aiming to compromise stored data.
Pharmacy Service, Hospital
Polymorphism, Single Nucleotide
A form of gene interaction whereby the expression of one gene interferes with or masks the expression of a different gene or genes. Genes whose expression interferes with or masks the effects of other genes are said to be epistatic to the effected genes. Genes whose expression is affected (blocked or masked) are hypostatic to the interfering genes.
Genome-Wide Association Study
All-trans-retinoic acid increases cytosine arabinoside cytotoxicity in HL-60 human leukemia cells in spite of decreased cellular ara-CTP accumulation. (1/66)BACKGROUND: Accumulation of the cytosine arabinoside (ara-C) metabolite ara-C-triphosphate (ara-CTP) in leukemic blast cells is considered to be the main determinant of ara-C cytotoxicity in vitro and in vivo. Retinoids such as all-trans-retinoic acid (ATRA) have been shown to increase the sensitivity of acute myelogenous leukemic (AML) blast cells to ara-C. To investigate the mechanism of this sensitisation, the hypothesis was tested that ATRA augments cellular ara-CTP levels in human-derived myelogenous leukemia HL-60 cells. MATERIALS AND METHODS: The effect of ATRA and 13-cis-retinoic acid on ara-CTP accumulation and ara-C-induced apoptosis was studied. Ara-CTP levels were measured by high-performance liquid chromatography (HPLC), cytotoxicity by the tetrazolium (MTT) assay, and apoptosis by occurrence of DNA fragmentation (gel electrophoresis), cell shrinkage and DNA loss (flow cytometry). RESULTS: Pretreatment of HL-60 cells with ATRA (0.01-1 microM) caused a significant decrease in intracellular ara-CTP levels; e.g., incubation for 72 hours with ATRA 1 microM prior to one hour ara-C 10 microM reduced ara-CTP levels to 41% +/- 4% of control. Similar results were obtained after preincubation with 13-cis-retinoic acid. In spite of decreased ara-CTP levels, the cytotoxicity of the combination was supraadditive and ATRA augmented ara-C-induced apoptosis. CONCLUSION: At therapeutically relevant concentrations ATRA increased ara-C cytotoxicity and ara-C induced apoptosis but this augmentation is not the corollary of elevated ara-CTP levels. The feasibility of ara-C treatment optimisation via strategies other than those involving elevation of ara-CTP levels should be investigated further. (+info)
Interim comparison of a continuous infusion versus a short daily infusion of cytarabine given in combination with cladribine for pediatric acute myeloid leukemia. (2/66)PURPOSE: To identify the optimal schedule for infusion of cytarabine (ara-C) given with cladribine (2-CdA) to pediatric patients with acute myeloid leukemia (AML), and to compare the effects of the two schedules on the pharmacokinetics of ara-C triphosphate (ara-CTP) in leukemic cells. PATIENTS AND METHODS: Forty-nine pediatric patients with newly diagnosed primary AML received a 5-day course of ara-C 500 mg/m(2)/d and 2-CdA 9 mg/m(2)/d. They were randomly assigned to receive ara-C as either a 2-hour daily infusion (arm A) or a continuous infusion (arm B). Cellular pharmacokinetics were studied on days 1 and 2. All patients then received two courses of remission induction chemotherapy with daunorubicin, ara-C, and etoposide (DAV). RESULTS: Thirty-two percent of patients (seven of 22) in arm A and 63% (17 of 27) in arm B entered complete remission (P =.045) after ara-C and 2-CdA therapy. Coadministration of 2-CdA increased the intracellular concentration of ara-CTP in 20 of 36 patients, although we found no statistically significant difference between the treatment arms in this effect (P =.63). The incidence of toxicity did not differ significantly between the two treatment arms (P =.53). After two courses of DAV, the rate of complete remission was 91% in arm A and 96% in arm B (P =.58). CONCLUSION: Intracellular accumulation of ara-CTP is increased when 2-CdA is given with ara-C, but no schedule-dependent differences in this effect were seen. The combination of 2-CdA and ara-C seems to be effective therapy for pediatric AML. (+info)
Differential mRNA expression of Ara-C-metabolizing enzymes explains Ara-C sensitivity in MLL gene-rearranged infant acute lymphoblastic leukemia. (3/66)Infant acute lymphoblastic leukemia (ALL) is characterized by a high incidence of mixed lineage leukemia (MLL) gene rearrangements, a poor outcome, and resistance to chemotherapeutic drugs. One exception is cytosine arabinoside (Ara-C), to which infant ALL cells are highly sensitive. To investigate the mechanism underlying Ara-C sensitivity in infants with ALL, mRNA levels of Ara-C-metabolizing enzymes were measured in infants (n = 18) and older children (noninfants) with ALL (n = 24). In the present study, infant ALL cells were 3.3-fold more sensitive to Ara-C (P =.007) and accumulated 2.3-fold more Ara-CTP (P =.011) upon exposure to Ara-C, compared with older children with ALL. Real-time quantitative reverse trancriptase-polymerase chain reaction (RT-PCR) (TaqMan) revealed that infants express 2-fold less of the Ara-C phosphorylating enzyme deoxycytidine kinase (dCK) mRNA (P =.026) but 2.5-fold more mRNA of the equilibrative nucleoside transporter 1 (hENT1), responsible for Ara-C membrane transport (P =.001). The mRNA expression of pyrimidine nucleotidase I (PN-I), cytidine deaminase (CDA), and deoxycytidylate deaminase (dCMPD) did not differ significantly between both groups. hENT1 mRNA expression inversely correlated with in vitro resistance to Ara-C (r(s) = -0.58, P =.006). The same differences concerning dCK and hENT1 mRNA expression were observed between MLL gene-rearranged (n = 14) and germ line MLL cases (n = 25). An oligonucleotide microarray screen (Affymetrix) comparing patients with MLL gene-rearranged ALL with those with nonrearranged ALL also showed a 1.9-fold lower dCK (P =.001) and a 2.7-fold higher hENT1 (P =.046) mRNA expression in patients with MLL gene-rearranged ALL. We conclude that an elevated expression of hENT1, which transports Ara-C across the cell membrane, contributes to Ara-C sensitivity in MLL gene-rearranged infant ALL. (+info)
The antimetabolite ara-CTP blocks long-term memory of conditioned taste aversion. (4/66)We examined the hypothesis that processes related to DNA recombination and repair are involved in learning and memory. Rats received intracerebroventricular (i.c.v.) infusions of the antimetabolite 1-beta-D-arabinofuranosylcytosine triphosphate (ara-CTP) or its precursor cytosine arabinoside (ara-C) 30 min prior to conditioned taste aversion (CTA) training. Both ara-CTP and ara-C caused significant impairments in long-term memory (LTM) of CTA. Control experiments indicate that the effect of ara-CTP on CTA memory is related to interference with learning. Furthermore, as it was previously demonstrated for the protein synthesis inhibitor anisomycin, ara-CTP had no effect on CTA memory when it was injected 1 h after training. Importantly, although both ara-CTP and anisomycin significantly blocked LTM in the task, short-term memory (STM) measured 1 h after training was not affected by either of the drugs. Finally, ara-CTP had no effect on in vitro transcription, but it did effectively block nonhomologous DNA end joining (NHEJ) activity of brain protein extracts. We suggest that DNA ligase-mediated DNA recombination and repair processes are necessary for the expression of LTM in the brain. (+info)
The value of fludarabine in addition to ARA-C and G-CSF in the treatment of patients with high-risk myelodysplastic syndromes and AML in elderly patients. (5/66)Fludarabine in addition to cytosine-arabinoside (ARA-C) increases the accumulation of ARA-C-5'-triphosphate (ARA-CTP), which is responsible for the cytotoxic effect in leukemic blasts. In a randomized phase 3 trial, patients with high-risk myelodysplastic syndrome (MDS) (n = 91) or elderly patients with acute myeloid leukemia (AML) (n = 43) were randomized to receive 2 induction courses consisting of ARA-C (2 g/m2 days 1 through 5) and granulocyte colony-stimulating factor (G-CSF) (filgrastim, 5 microg/kg) during and after chemotherapy with or without fludarabine (25 mg/m2, days 1 through 5) (FLAG versus AG). Consolidation consisted of daunorubicin (45 mg/m2, days 1 through 3) and ARA-C (200 mg/m2, days 1 through 7). Complete remission (CR) rate following AG was 65% versus 71% with FLAG (P =.49). Overall survival (OS) at 24 months was 24% for AG treatment and 39% for FLAG (P =.32). Event-free survival (EFS) at 2 years was 10% and 19% (P =.31) for the AG and FLAG treatments, respectively. Platelet and granulocyte recovery times after the second cycle were prolonged in the FLAG treatment group. Grades 3 to 4 neurotoxicities were more often reported in the FLAG arm (14% versus 3%, P =.03), whereas no significant differences in other toxicities were observed. In a cohort of patients, the in vivo accumulation of ARA-CTP in leukemic cells was determined. Although ARA-CTP accumulation in leukemic cells after FLAG was enhanced, clinical outcome in terms of CR rate, OS, EFS, and disease-free survival (DFS) was not significantly improved by combining fludarabine with ARA-C. (+info)
Human immunodeficiency virus type 1 induces 1-beta-D-arabinofuranosylcytosine resistance in human H9 cell line. (6/66)We have found that chronically HIV-1(IIIB)-infected H9 cells showed 21-fold resistance to 1-beta-D-arabinofuranosylcytosine (ARA-C) compared with uninfected H9 cells. In the infected H9 cells, a 37% increase of dCTP pool and a 34% increase of dATP were observed, and no alteration of dTTP and dGTP was observed, compared with the uninfected H9 cells. A marked decrease of ARA-CTP generation was observed in the infected H9 cells after 3-h incubation with 0.1-10 microM ARA-C. The level of deoxycytidine kinase activity with ARA-C as substrate was similar in both the infected and the uninfected cells; however, a 37-fold increase of cytidine deaminase activity was observed in the infected H9 cells. These results indicate that the induction of cytidine deaminase activity by HIV-1(IIIB) infection conferred ARA-C resistance to H9 cells. This conclusion was supported by the observation that a marked reversal of ARA-C resistance in the infected H9 cells occurred after treatment with the inhibitor of cytidine deaminase, 3,4,5,6-tetrahydrouridine. The understanding of these cellular alterations in drug sensitivity may facilitate the development of effective therapeutic strategies against HIV-1-infected cells. (+info)
GATA1, cytidine deaminase, and the high cure rate of Down syndrome children with acute megakaryocytic leukemia. (7/66)Down syndrome children with acute megakaryocytic leukemia (AMkL) have higher cure rates than non-Down syndrome acute myeloid leukemia (AML) patients treated with cytosine arabinoside (ara-C). Megakaryoblasts from Down syndrome AML patients are more sensitive in vitro to ara-C than cells from non-Down syndrome AML patients. Somatic mutations in the GATA1 transcription factor have been detected exclusively and almost uniformly in Down syndrome AMkL patients, suggesting a potential linkage to the chemotherapy sensitivity of Down syndrome megakaryoblasts. Stable transfection of wild-type GATA1 cDNA into the Down syndrome AMkL cell line CMK resulted in decreased (8- to 17-fold) ara-C sensitivity and a threefold-lower generation of the active ara-C metabolite ara-CTP compared with that for mock-transfected CMK cells. High intracellular levels of uridine arabinoside (ara-U) (an inactive ara-C catabolite generated by cytidine deaminase) and cytidine deaminase transcripts were detected in GATA1-transfected CMK sublines, whereas no ara-U was detected in mock-transfected cells. Cytidine deaminase transcripts were a median 5.1-fold (P = .002) lower in Down syndrome megakaryoblasts (n = 16) than in blast cells from non-Down syndrome patients (n = 56). These results suggest that GATA1 transcriptionally upregulates cytidine deaminase and that the presence or absence of GATA1 mutations in AML blasts likely confers differences in ara-C sensitivities due to effects on cytidine deaminase gene expression, which, in turn, contributes to the high cure rate of Down syndrome AMkL patients. (+info)
An inhibitor of DNA recombination blocks memory consolidation, but not reconsolidation, in context fear conditioning. (8/66)Genomic recombination requires cutting, processing, and rejoining of DNA by endonucleases, polymerases, and ligases, among other factors. We have proposed that DNA recombination mechanisms may contribute to long-term memory (LTM) formation in the brain. Our previous studies with the nucleoside analog 1-beta-D-arabinofuranosylcytosine triphosphate (ara-CTP), a known inhibitor of DNA ligases and polymerases, showed that this agent blocked consolidation of conditioned taste aversion without interfering with short-term memory (STM). However, because polymerases and ligases are also essential for DNA replication, it remained unclear whether the effects of this drug on consolidation were attributable to interference with DNA recombination or neurogenesis. Here we show, using C57BL/6 mice, that ara-CTP specifically blocks consolidation but not STM of context fear conditioning, a task previously shown not to require neurogenesis. The effects of a single systemic dose of cytosine arabinoside (ara-C) on LTM were evident as early as 6 h after training. In addition, although ara-C impaired LTM, it did not impair general locomotor activity nor induce brain neurotoxicity. Importantly, hippocampal, but not insular cortex, infusions of ara-C also blocked consolidation of context fear conditioning. Separate studies revealed that context fear conditioning training significantly induced nonhomologous DNA end joining activity indicative of DNA ligase-dependent recombination in hippocampal, but not cortex, protein extracts. Finally, unlike inhibition of protein synthesis, systemic ara-C did not block reconsolidation of context fear conditioning. Our results support the idea that DNA recombination is a process specific to consolidation that is not involved in the postreactivation editing of memories. (+info)
Arabinofuranosylcytosine Triphosphate Summary Report | CureHunter
Arabinofuranosylcytosine Triphosphate: A triphosphate nucleotide analog which is the biologically active form of CYTARABINE. It inhibits nuclear DNA synthesis.
Scheduling of arabinosylcytosine (ara-c) and 6-thioguanine (6-tg) ther by G Le page and S White
Le page, G and White, S, Scheduling of arabinosylcytosine (ara-c) and 6-thioguanine (6-tg) therapy. Abstr. (1972). Subject Strain Bibliography 1972. 390 ...
1-beta-d-Arabinofuranosylcytosine (ara-C), an effective drug for acute leukemias, must be phosphorylated to its 5-triphosphate, ara-CTP, for activity. Our previous studies during therapy of acute myelogenous leukemia (AML) patients demonstrated that the accumulation of ara-CTP in circulating leukemia blasts was increased by a median of 2-fold when fludarabine (30 mg/m2/day over 30 min) was infused 4 h prior to intermediate dose ara-C. The augmentation was dependent on the cellular concentration of fludarabine triphosphate (F-ara-ATP). To determine the lowest dose of fludarabine needed for modulation of ara-C metabolism, the present study administered fludarabine at a test dose (15 mg/m2 over 30 min) followed by 2 g/m2 ara-C infused over 4 h. The next day, the fludarabine/ara-C couplet was repeated but with a standard dose (30 mg/m2) of fludarabine. There was a dose-dependent accumulation of F-ara-ATP in circulating leukemia blasts; the median peak concentrations were 33 and 41 microM with 15 ...
A radioimmunoassay for 1-beta-d-arabinofuranosylcytosine. by T Okabayashi, S Mihara et al.
Okabayashi, T; Mihara, S; Repke, D B.; and Moffatt, J G., A radioimmunoassay for 1-beta-d-arabinofuranosylcytosine. (1977). Subject Strain Bibliography 1977. 1646 ...
Orally Administered Liposomally Entrapped Insulin | Biochemical Society Transactions
Thank you for your interest in spreading the word about Biochemical Society Transactions.. NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address.. ...
Cytarabine (cytosine arabinoside, Cytosar-U) | Daviss Drug Guide
Find information on Cytarabine (cytosine arabinoside, Cytosar-U) in Daviss Drug Guide including dosage, side effects, interactions, nursing implications, mechanism of action, half life, administration, and more. Davis Drug Guide PDF.
Time controlled release of arabinofuranosylcytosine (Ara-C) from agarose hydrogels using layer-by-layer assembly: An in vitro...
TY - JOUR. T1 - Time controlled release of arabinofuranosylcytosine (Ara-C) from agarose hydrogels using layer-by-layer assembly. T2 - Journal of Biomaterials Science, Polymer Edition. AU - Mehrotra,Sumit. AU - Lynam,Daniel. AU - Liu,Chun. AU - Shahriari,Dena. AU - Lee,Ilsoon. AU - Tuszynski,Mark. AU - Sakamoto,Jeffrey. AU - Chan,Christina. PY - 2012. Y1 - 2012. N2 - Experimentally induced axonal regeneration is compromised by glial scar formation arising from leptomeningeal fibroblasts cells in and around the hydrogel scaffold implanted for nerve repair. Strategies are needed to prevent such fibroblastic reactive cell layer formation for enhanced axonal regeneration. Here, we implement the technique of layer-by-layer assembled degradable, hydrogen bonded multilayers on agarose hydrogels to incorporate an anti-mitotic drug (1-β-D-arabinofuranosylcytosine (Ara-C)) within the agarose hydrogels. We show controlled release of Ara-C under physiological conditions over a period of days. The ...
The cytocidal activity of arabinosyl-5-azacytosine (araAC) and its effect on the synthesis and methylation of DNA in the human colon carcinoma cell line HT-29 was examined and compared with three other cytidine analogues. Treatment for 2 hr with 10(-6)M arabinosylcytosine (araC), araAC, 5-azacytidine (AZC), or 2-deoxy-5-azacytidine (dAZC) produced a 7-30% reduction in cell viability. Prolongation of drug exposure to 24 hr significantly enhanced the cytotoxicity of all analogues, and particularly dAZC. AZC and dAZC were potent inhibitors of DNA methylation in the absence of inhibition of DNA synthesis, whereas araC and araAC primarily affected DNA synthesis. RNA synthesis was not affected by any of the analogues. dAZC and AZC were incorporated into DNA to a greater extent than were araC or araAC upon short- and long-term drug exposure, whereas only AZC was incorporated into RNA. These data indicate that araAC appears to behave more as an analogue of araC rather than of dAZC or AZC, wherein it ...
Browse by Creator - Research Repository
Anderson, E., Conway, M. E., Alloush, H., OMalley, K., Smith, A., Ashley, M., Ruddock, M., Reid, C., Lamont, J., Fitzgerald, P., Smith, G., Mehta, P. and Salisbury, V. (2014) Investigation and verification of a bioluminescent biosensor for the quantitation of ara-CTP generation: A biomarker for cytosine arabinoside sensitivity in acute myeloid leukaemia. Biosensors and Bioelectronics, 52. pp. 345-353. ISSN 0956-5663 Available from: http://eprints.uwe.ac.uk/21585 Anderson, E., Smith, M. A., Martin, A., Ruddock, M., Lamont, J., Alloush, H., Conway, M. E., Mehta, P., Smith, J. G. and Salisbury, V. (2013) A novel bioluminescent bacterial biosensor for measurement of Ara-CTP and cytarabine potentiation by fludarabine in seven leukaemic cell lines. Leukemia Research, 37 (6). pp. 690-696. ISSN 0145-2126 Available from: http://eprints.uwe.ac.uk/21670 Turner, D., Hezwani, M., Nelson, S., Salisbury, V. and Reynolds, D. M. (2012) Characterization of the Salmonella bacteriophage vB_SenS-Ent1. Journal of ...
Pharmacogenetics of Ara-C Metabolic Pathway - Jatinder Lamba
The nucleoside analog cytarabine (ara-C) has been the mainstay of acute myeloid leukemia (AML) chemotherapy for more than 40 years and is one of the most import...
Effect of Cytosine Arabinoside on Disseminated Herpes Zoster and Vesicle Fluid Interferon. | Annals of Internal Medicine |...
Fifty-three patients with disseminated herpes zoster were studied; 20 of them received intravenous cytosine arabinoside. Experience with an early treatment (first 2 days of dissemination) program suggested cytosine arabinoside shortened dissemination compared with untreated patients seen previously. With increased referral of early disseminated cases, the study population changed to include a greater proportion with milder disease. A double blind study was initiated and is currently in progress. To date, the results (11 patients) in the placebo and cytosine arabinoside groups arent significantly different. Treatment with cytosine arabinoside shortens dissemination in some patients destined to have prolonged dissemination and visceral complications: ...
Compartmentation of dCTP pools. Evidence from deoxyliponucleotide synthesis
The nucleotide fraction of cultured 3T6 and 3T3 mouse fibroblasts contains deoxy-CDP choline and deoxy-CDP ethanolamine as well as the corresponding riboliponucleotides. In permeabilized cells both deoxyliponucleotides were formed from dCTP. In intact cells they could be labeled from [5-3H] deoxycytidine or cytidine via transformation of the nucleosides to dCTP. Their turnover was slow compared to that of dCTP. When rapidly growing 3T3 cells were labeled during 90 min from deoxycytidine the specific activity of dCDP choline was 2.4 times higher than that of dCTP while after labeling from cytidine both nucleotides (and CTP) reached the same specific activity under steady state conditions. Also dCDP ethanolamine was labeled more rapidly from deoxycytidine than from cytidine. Our results suggest that the deoxyliponucleotides were synthesized from a dCTP pool that was labeled preferentially from deoxycytidine. Earlier work (Nicander, B., and Reichard, P. (1983) Proc. Natl. Acad. Sci. U. S. A. 80, ...
Fludarabine (F-ara-A) | Nucleoside Antimetabolite/Analog Inhibitor | MedChemExpress
Fludarabine (NSC 118218) is a DNA synthesis inhibitor, which also inhibits phosphorylation of STAT1. Fludarabine, a pro-drug, is converted metabolically by dephosphorylation to the antimetabolite, F-ara-A. - Mechanism of Action & Protocol.
Ara-C scheduling: Theoretical and experimental considerations<...
TY - JOUR. T1 - Ara-C scheduling. T2 - Theoretical and experimental considerations. AU - Gray, Joe. AU - Pallavicini, M. G.. PY - 1982. Y1 - 1982. N2 - In this paper, we discuss the cytokinetic basis for optimization of cancer therapy in humans. Specifically, we define a quantitative procedure for determination of the therapeutic acceptability of therapy schedule, discuss studies of the therapeutic gain that might result from treatment of acute lymphoid leukemia (ALL) with cytosine arabinoside (Ara-C), and indicate the kinds of cytokinetic information necessary for therapy scheduling. These studies suggest 1) that substantial therapeutic improvements may result from optimal therapy scheduling, 2) that therapy schedules selected at random are not likely to be beneficial, and 3) that consideration of the cytokinetic properties of the dose limiting normal tissues is critical during therapy design. We also discuss experimental studies of the response to Ara-C of the murine KHT sarcoma. These studies ...
Activation of deoxycytidine kinase by inhibition of DNA synthesis in human lymphocytes<...
TY - JOUR. T1 - Activation of deoxycytidine kinase by inhibition of DNA synthesis in human lymphocytes. AU - Csapó, Z.. AU - Sasvári, M.. AU - Spasokoukotskaja, T.. AU - Talianidis, Iannis. AU - Eriksson, Staffan. AU - Staub, M.. PY - 2001/1/15. Y1 - 2001/1/15. N2 - Deoxycytidine kinase (dCK, EC.126.96.36.199) is a key enzyme in the intracellular metabolism of 2-chlorodeoxyadenosine, 1β-D-arabinofuranosylcytosine, difluorodeoxycytidine, and other drugs used in chemotherapy of different leukaemias and solid tumours. Recently, stimulation of dCK activity was shown by these analogues and by other genotoxic agents such as etoposide and NaF, all of which cause severe inhibition of DNA synthesis in cell cultures. Here we describe that direct inhibition of DNA polymerases by aphidicolin stimulated dCK activity in normal lymphocytes and acute myeloid leukaemic cells, as well as in HL 60 promyelocytic cell cultures. Increased dCK activity was not due to new protein synthesis under our conditions, as ...
A phase III randomized of Cloretazine (VNP40101M) [laromustine] and cytosine arabinoside (AraC) [cytarabine] in patients with...
This trial will compare the efficacy and tolerability of cytarabine [cytosine arabinoside] with or without laromustine [Cloretazine, VNP40101M] in patients with
langkah langkah untuk membuat quarry dalam microsoft access
Cara membuat permintaan Total berjalan di Microsoft Access, Cara membuat permintaan Total berjalan di Microsoft Access Tingkat lanjut: Memerlukan pengkodean ahli, interoperabilitas, dan kemampuan multi-pengguna Artikel ini berlaku untuk Microsoft Access database (MDB) file atau file database (accdb) Microsoft Access Versi untuk Microsoft Access 2000 dari artikel ini, lihat 208714LANGKAH, Pada kesempatan kali ini Saya akan memberikan tutorial bagaimana cara mengolah QUERY pada Ms Access 2016, sebelum masuk pada hal inti sebaiknya kita mengetahui dulu apa sih Ms Access itu?? Microsoft Access (atau Microsoft Office Access) adalah sebuah program aplikasi basis data komputer relasional yang ditujukan untuk kalangan rumahan dan perusahaan kecil hingga menengah,Tutorial Microsoft Access Cara Membuat Form di Ms Access, Untuk totorial microsoft access penulis akan share cara membuat form beserta fungsi tombol-tombol standart yang biasanya di temui dalam form aplikasi access, seperti misalnya fungsi dari ...
Diphtheria toxin fused to granulocyte-macrophage colony-stimulating factor and Ara-C exert synergistic toxicity against human...
TY - JOUR. T1 - Diphtheria toxin fused to granulocyte-macrophage colony-stimulating factor and Ara-C exert synergistic toxicity against human AML HL-60 cells. AU - Kim, Caryn N.. AU - Bhalla, Kapil. AU - Kreitman, Robert J.. AU - Willingham, Mark C.. AU - Hall, Philip. AU - Tagge, Edward P.. AU - Jia, Tao. AU - Frankel, Authur E.. PY - 1999/6/1. Y1 - 1999/6/1. N2 - Human granulocyte-macrophage colony-stimulating factor fused to truncated diphtheria toxin (DT388-GM-CSF) sensitized wild-type and Bcl2- overexpressing HL60 human leukemia cells to intoxication by Ara-C based on proliferation and clonogenic assays. The toxin/drug combination showed dramatic synergistic toxicity with combination indices of , 0.1. Synergy was not seen with two other protein synthesis inhibiting drugs - ricin and cycloheximide nor with GMCSF alone: No changes in Ara-C incorporation into cellular DNA or cell cycle occupancy were seen. As compared to exposure to DT388-GM-CSF or Ara-C alone, co-treatment produced ...
Cytosine arabinoside induces programmed endothelial cell death through the caspase-3 pathway<...
TY - JOUR. T1 - Cytosine arabinoside induces programmed endothelial cell death through the caspase-3 pathway. AU - Moore, Ida M. AU - Merkle, Carrie J. AU - Miketova, Petra. AU - Salyer, Renee K.. AU - Torres, Bonny J.. AU - Schaeffer, Richard C.. AU - Montgomery, David W. PY - 2006/4. Y1 - 2006/4. N2 - The anti-cancer effects of cytosine arabinoside (ARA-C) are well known. However, effects on nonmalignant cells have not been elucidated and may be important to understanding treatment-related toxicity. The purpose of this study was to examine the effect of ARA-C on nondividing vascular endothelial cells. The objectives were to determine the effects of ARA-C on cell viability and to ascertain whether ARA-C caused apoptosis in cultured vascular endothelial cells and hydrocortisone blunted caspase-3-induced apoptosis. Endothelial cells were cultured until confluent and mitotically quiescent then exposed to ARA-C (10 -7 to 10 -3 M) for 1 to 4 days. Some experiments involved cotreatment with ...
Proven to correct the UV-induced DNA damage underlying wrinkles, brown spots, and skin cancer, these liposomally encapsulated marine extracts break the abnormal bonds forged by UV light, causing atoms in our DNA to resume their normal positions. In a study published in The Lancet in 2001, 30 subjects with a rare genetic disorder predisposing them to skin cancer applied a lotion with DNA repair enzymes daily for one year. At the trials end, they saw a 68 percent reduction in the development of precancerous lesions, and 30 percent fewer basal cell carcinomas.. DOUBLE CLEANSE ...
The molecular formula C9H16N3O14P3 may refer to: Cytidine triphosphate Arabinofuranosylcytosine triphosphate This set index ...
List of MeSH codes (D13)
... arabinofuranosylcytosine triphosphate MeSH D13.695.740.246.115 - cyclic cmp MeSH D13.695.740.246.150 - cytidine diphosphate ... arabinofuranosylcytosine triphosphate MeSH D13.695.065.900 - vidarabine phosphate MeSH D13.695.201.100 - deoxyadenine ... uridine triphosphate MeSH D13.695.900.380 - guanosine 5'-o-(3-thiotriphosphate) The list continues at List of MeSH codes (D20). ... ethenoadenosine triphosphate MeSH D13.695.667.138.382 - coenzyme a MeSH D13.695.667.138.382.300 - acyl coenzyme a MeSH D13.695. ...
... is a nucleotide that inhibits the synthesis of DNA by acting as an antimetabolic agent ...
Category:Organic compound stubs
Arabinofuranosylcytosine triphosphate. *Arabitol. *Arachidic acid. *Araloside A. *Arcapillin. *Archaeol. *Arisugacin A. * ...
... -5´-triphosphate is a substrate for SAMHD1. Furthermore, SAMHD1 has been shown to limit the efficacy of cytarabine ... It is an antimetabolic agent with the chemical name of 1β-arabinofuranosylcytosine. Certain sponges, where it was originally ... Its mode of action is due to its rapid conversion into cytosine arabinoside triphosphate, which damages DNA when the cell cycle ... When used as an antiviral, cytarabine-5´-triphosphate functions by inhibiting viral DNA synthesis. Cytarabine is able to ...
Arabinofuranosylcytosine triphosphate - Wikipedia
Arabinofuranosylcytosine Triphosphate Summary Report | CureHunter
A triphosphate nucleotide analog which is the biologically active form of CYTARABINE. It inhibits nuclear DNA synthesis. ... Arabinofuranosylcytosine Triphosphate. Subscribe to New Research on Arabinofuranosylcytosine Triphosphate A triphosphate ... Ara CTP; Triphosphate, Arabinofuranosylcytosine; Triphosphate, Arabinosylcytosine; Triphosphate, Cytarabine; Triphosphate, ... Arabinofuranosylcytosine Triphosphate: 72*1-(2-deoxy-2-fluoro-beta-arabinofuranosyl)-5-methylcytosine triphosphate ...
Minimum dose of fludarabine for the maximal modulation of 1-beta-D-arabinofuranosylcytosine triphosphate in human leukemia...
1-beta-d-Arabinofuranosylcytosine (ara-C), an effective drug for acute leukemias, must be phosphorylated to its 5-triphosphate ... Minimum dose of fludarabine for the maximal modulation of 1-beta-D-arabinofuranosylcytosine triphosphate in human leukemia ... Minimum dose of fludarabine for the maximal modulation of 1-beta-D-arabinofuranosylcytosine triphosphate in human leukemia ... Minimum dose of fludarabine for the maximal modulation of 1-beta-D-arabinofuranosylcytosine triphosphate in human leukemia ...
C9H16N3O14P3 - Wikipedia
Frontiers | The Pharmacological Potential of Non-ribosomal Peptides from Marine Sponge and Tunicates | Pharmacology
... triphosphate of 1-β-d-arabinofuranosylcytosine and the 5′-triphosphate of 9-β-d-arabinofuranosyladenine. Cancer Res. 28, 2061- ... Since homophymine A lacks structural features to act as mimics of natural nucleotide triphosphates, it is likely to impede the ... deoxyribose). The natural nucleoside mimics Ara-A and Ara-C are easily phosphorylated as their triphosphate derivatives by ... one that directly competes with natural nucleotide triphosphates and the other that either directly blocks the catalytic ...
Table of Contents | Cancer Research
Phase 2 and pharmacodynamic study of oral forodesine in patients with advanced, fludarabine-treated chronic lymphocytic...
Quantitation of 1-beta-D-arabinofuranosylcytosine 5′-triphosphate in the leukemic cells from bone marrow and peripheral blood ... deoxyadenosine triphosphate, deoxycytidine triphosphate, and thymidine triphosphate TTP (n = 5; data not shown). ... 3H]deoxyadenosine triphosphate and [3H]deoxythymidine triphosphate were purchased from PerkinElmer Life Sciences and MP ... Intracellular deoxyguanosine triphosphate (dGTP) increase was very modest, from median of 6μM to 10μM. Compared with in vivo, ...
Purification and characterization of two forms of DNA polymerase alpha from HeLa cell nuclei. - PubMed - NCBI
Table of Contents | Cancer Research
Beverly S. Mitchell, M.D. | Stanford Medicine Profiles
... triphosphate accumulation was approximately 30% of control values. Thus, ara-G differs from 1-beta-D-arabinofuranosylcytosine ... All patients who suffered major organ toxicity had red blood cell deoxyadenosine triphosphate/adenosine triphosphate ratios ... These data suggest that the degree of replacement of adenosine triphosphate by deoxyadenosine triphosphate in erythrocytes ... nor did the accumulation of 1-beta-D-arabinofuranosylcytosine 5-triphosphate in the freshly isolated leukemic cells differ ...
FAC - 5-fluorouracil-adriamycin-cyclophosphamide | AcronymAttic
... arabinofuranosylcytosine triphosphate ara u = arabinofuranosyluracil aras = atherosclerotic renal artery stenosis arbkt = aids ... cytidine triphosphate ctr = carpal tunnel release ctr = center ctr = central ctrl = control key cts = carpal tunnel syndrome ... copper adenosine triphosphate cuc = chronic ulcerative colitis cult = culture culys = copper lysine cuo = calovo fever cup = ... adenosine triphosphate atp = advanced technology program atp = azathioprine atra = all trans-retinoic acid ats = alport ...
Category:Organic compound stubs - Wikipedia
Table of Contents | Antimicrobial Agents and Chemotherapy
Division of Clinical Pharmacy and Diagnostics » Walter Jäger - Publications
P. Chiba, T. Szekeres, W. Jäger: Determination of Pyrimidine Deoxynucleoside 1-ß-D-Arabinofuranosylcytosine Triphosphate. Eur. ... Effects in human HL-60 promyelocytic leukemia cells and synergism with arabinofuranosylcytosine (Ara-C). Biochem. Pharmacol. 81 ... Heterodinucleoside phosphates of 5-fluorodeoxyuridine and arabinofuranosylcytosine-new drugs in cancer chemotherapy? In Vivo 19 ... Cytotoxic effects of novel amphiphilic dimers consisting of 5-fluorodeoxyuridine and arabinofuranosylcytosine in cross- ...
Sequence and annotation of the 288-kb ATCV-1 virus that infects an endosymbiotic chlorella strain of the heliozoon...
Cytosine Nucleotides | Profiles RNS
The Ankyrin Repeats of TRPV1 Bind Multiple Ligands and Modulate Channel Sensitivity - Semantic Scholar
The structure reveals a binding site that accommodates triphosphate nucleotides such as ATP, and biochemical studies ... The structure reveals a binding site that accommodates triphosphate nucleotides such as ATP, and biochemical studies ... Arabinofuranosylcytosine Triphosphate. *Nucleotides. *Nociception. *Pain, Burning. *Pain Perception. *hypersensitivity ...
Microsoft word - cv-fy2009-july 2009.doc
arabinofuranosylcytosine 5-triphosphate and 9-ß-D-arabinofuranosyl-2-fluoroadenine 5-triphosphate in human leukemia cells by ... determination and quantitation of arabinosylguanine triphosphate and fludarabine triphosphate in human cells. J. Chromatography ... triphosphate in primary human leukemia cells. Clin. Cancer Res. 3:2107-2113, 1997. Gandhi, V., Plunkett, W., Kantarjian, H., ... triphosphate by clofarabine. Proc. AACR, 44:119, 2003. 3. Pillai, R.N., Nowak, B., Keating, M.J., and Gandhi, V. Multifaceted ...
Gemtuzumab ozogamicin in acute myeloid leukaemia - Cancerworld
SLC29A1 single nucleotide polymorphisms as independent prognostic predictors for survival of patients with acute myeloid...
... triphosphate of 1-beta-d-arabinofuranosylcytosine and the 5-triphosphate of 9-beta-d-arabinofuranoxyladenine. Cancer Res. 1968 ... Jamieson GP, Finch LR, Snook M, Wiley JS: Degradation of 1-beta-D-arabinofuranosylcytosine 5-triphosphate in human leukemic ... Colly LP, Willemze R, Honders W, vd Hoorn F, Edelbroek PM: In vivo studies on high-dose 1-beta-D-arabinofuranosylcytosine ( ... Graham FL, Whitmore GF: Studies in mouse L-cells on the incorporation of 1-beta-D-arabinofuranosylcytosine into DNA and on ...
WO2019006133 MÉTHODES DE RETARDEMENT ET DE PRÉVENTION DE RECHUTE DE LEUCÉMIE AIGUË MYÉLOÏDE
Polbase - Authors
Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer | BMC Cancer | Full Text
Since troxacitabine triphosphate is a poor feedback inhibitor of dCK , it is not likely to limit accumulation of ... Yamauchi T, Ueda T, Nakamura T: A new sensitive method for determination of intracellular 1-beta-D-arabinofuranosylcytosine 5- ... Kukhanova M, Liu SH, Mozzherin D, Lin TS, Chu CK, Cheng YC: L- and D-enantiomers of 2,3-dideoxycytidine 5-triphosphate ... HPLC analysis of 15 nmol each of troxacitabine, troxacitabine mono-, di- and triphosphates standards yielded retention times of ...
Inhibition of mitochondrial permeability transition and release of cytochrome c by anti-apoptotic nucleoside analogues. -...
... triphosphate, which activated apoptosis in post-mitotic neurones without incorporation into nuclear DNA, induced rapid calcium- ... Adenine, Animals, Arabinofuranosylcytosine Triphosphate, Cytarabine, Cytochrome c Group, Drug Interactions, Enzyme Inhibitors, ... triphosphate, which activated apoptosis in post-mitotic neurones without incorporation into nuclear DNA, induced rapid calcium- ...
Template Design Nature Ten Benefits Of Template Design Nature That May Change Your Perspective - blakelivelybrasil.com
cytidine triphosphate sigma
... selective LC/MS/MS method for the simultaneous determination of intracellular 1-beta-d-arabinofuranosylcytosine triphosphate ( ... Cytidine triphosphate is a pyrimidine nucleoside triphosphate. Cytidine triphosphate is a pyrimidine nucleoside triphosphate ... CTP(4-) is a nucleoside triphosphate(4-) obtained by global deprotonation of the triphosphate … cytidine-triphosphate. ... Cytidine triphosphate synthetase (CTPS) mediates the conversion of uridine triphosphate (UTP) into cytidine triphosphate (CTP ...
Unscheduled DNA synthesis induced by N-methyl-N'-nitro-N-nitrosoguanidine in Hela cells. - PubMed - NCBI
Arabinofuranosylcytosine - Immunosuppressive Agents, Antivirals, Antimetabolites, Antineoplastic Agents, ...
Cytarabine is metabolized intracellularly into its active triphosphate form (cytosine arabinoside triphosphate). This ... Arabinofuranosylcytosine msds (material safety sheet) Arabinofuranosylcytosine MSDS Arabinofuranosylcytosine Synthesis ... Arabinofuranosylcytosine Dosage Forms Injectable solution Arabinofuranosylcytosine Indication For the treatment of acute non- ... Arabinofuranosylcytosine Patient Information This medicine is a type of chemotherapy for treating cancers of the blood and ...
Search Articles | University of Toronto Libraries
Arabinofuranosylcytosine Triphosphate - metabolism , Antimetabolites, Antineoplastic - therapeutic use , Animals , Monomeric ... Adenosine triphosphate , Cancer , Biological Sciences , Medical Biotechnology , Naturvetenskap , Medical and Health Sciences , ... Adenosine Triphosphate - metabolism , Enzyme Inhibitors - chemistry , Cell Line, Tumor , HL-60 Cells , Female , Cell ...
- A triphosphate nucleotide analog which is the biologically active form of CYTARABINE. (curehunter.com)
- 2] Other data have suggested that further escalation of the cytarabine dose beyond levels that saturate intracellular arabinofuranosylcytosine triphosphate is not beneficial. (cancerworld.net)
- Cytarabine is metabolized intracellularly into its active triphosphate form (cytosine arabinoside triphosphate). (pharmacycode.com)
- Cytarabine is converted to the triphosphate form within the cell and then competes with cytidine for incorporation into DNA. (cancer.gov)
- Cytosine arabinoside arabinofuranosylcytosine arabinosylcytosine aracytidine beta-cytosine arabinoside cytarabine hydrochloride cytarabinum cytosine arabinoside cytosine arabinosine hydrochloride cytosine-.beta. (cancer.gov)
- Cytarabine is chemically 1-β-D-Arabinofuranosylcytosine. (rxlist.com)
- Coadministration of 50 μM uridine prevented depletion of pyrimidine nucleoside triphosphates and inhibition of colony formation of HL-60 cells exposed to 3 mM N-(phosphonacetyl)-L-aspartate) or 5 x 10 -6 M pyrazofurin but was not capable of protecting HL-60-5-azacytidine under the same conditions. (houstonmethodist.org)
- These analogs are part of our continuing efforts to identify new anticancer drugs as well as to explore the substrate specificities of these analogs with the initial activating enzymes in the metabolic pathway leading to nucleoside triphosphates. (dasmaninstitute.org)
- Upon cellular metabolism, two additional phosphorylations occur to form the nucleotide phosphonate diphosphate which represents the equivalent of nucleoside triphosphates. (google.com)
- We found that the pro-apoptotic pyrimidine analogues cytosine beta-D-arabinofuranoside and cytosine beta-D-arabinofuranoside 5'-triphosphate, which activated apoptosis in post-mitotic neurones without incorporation into nuclear DNA, induced rapid calcium-dependent mitochondrial swelling of isolated liver mitochondria in a dose-dependent manner. (ox.ac.uk)
- Its mode of action is due to its rapid conversion into cytosine arabinoside triphosphate, which damages DNA when the cell cycle holds in the S phase(synthesis of DNA). (oncologydrugs.co.in)
- dFdU monophosphate, diphosphate, and triphosphate (dFdU-TP) were formed from dFdC and dFdU. (aacrjournals.org)
- dFdC is transported into cells by human nucleoside transporters ( 7 ) and is intracellularly phosphorylated by deoxycytidine kinase to its monophosphate (dFdC-MP) and subsequently phosphorylated to its active diphosphate (dFdC-DP) and triphosphate (dFdC-TP) metabolites ( 5 ). (aacrjournals.org)
- Transport of dFdC by human nucleoside transporters and phosphorylation by deoxycytidine kinase ( dCK ) to its monophosphate ( dFdC-MP ) and by human nucleoside monophosphate and diphosphate kinases ( NMPK and NDPK ) into its diphosphate ( dFdC-DP ) and triphosphate ( dFdC-TP ) metabolites. (aacrjournals.org)
- dFdU is transported into cells by hCNT1 and phosphorylated to its monophosphate ( dFdU-MP ), diphosphate ( dFdU-DP ), and its triphosphate ( dFdU-TP ), which is incorporated into DNA and RNA. (aacrjournals.org)
- These gemcitabine mononucleotides, subsequently activated by nucleotide kinase to gemcitabine diphosphate and gemcitabine triphosphate, are then incorporated into DNA leading to masked chain termination ( 2 , 3 ). (aacrjournals.org)
- The molecular formula C9H16N3O14P3 may refer to: Cytidine triphosphate Arabinofuranosylcytosine triphosphate This set index page lists chemical structure articles associated with the same molecular formula. (wikipedia.org)
- Cytidine triphosphate is a pyrimidine nucleoside triphosphate. (musiclargo.com)
- Cytidine triphosphate synthetase (CTPS) mediates the conversion of uridine triphosphate (UTP) into cytidine triphosphate (CTP) (Scheme 17), which is the rate-limiting step of de novo CTP biosynthesis. (musiclargo.com)
- 2019) on Bacillus subtilis and Myxococcus xanthus ParB, respectively, showed that ParB binds and hydrolyzes cytidine triphosphate (CTP) to cytidine … 62K1064 - you will only find the COO if CTP is a substrate in the synthesis of RNA. (musiclargo.com)
- Cytidine triphosphate synthetase (CTPS) is the rate-limiting enzyme in de novoCTP synthesis and is required for the formation of RNA, DNA, and phospholipids. (musiclargo.com)
- Cytidine 5′-Triphosphate, 100 mM solution (CTP). (musiclargo.com)
- Cytidine controls neuronal-glial glutamate cycling, affecting cerebral phospholipid metabolism, … CTP is a pyrimidine ribonucleoside 5'-triphosphate and a cytidine 5'-phosphate.It has a role as an Escherichia coli metabolite and a mouse metabolite. (musiclargo.com)
- Parent Compound: CID 6176 (Cytidine-5'-triphosphate) Dates: Modify: 2020-08-08. (musiclargo.com)
- CTP, much like ATP, consists of a ribose sugar, and three phosphate groups.The major difference between the two molecules is the base used, … Uridine-5'-triphosphate (UTP) is a pyrimidine nucleoside triphosphate, consisting of the organic base uracil linked to the 1' carbon of the ribose sugar, and esterified with tri-phosphoric acid at the 5' … It is present in RNA. (musiclargo.com)
- Conclusions: Our results suggest that an arrest of DNA replication caused by gemcitabine treatment through incorporation of gemcitabine triphosphate into replicating DNA and inhibition of ribonucleotide reductase would trigger an increase in DNA ligase I levels in cancer cells. (elsevier.com)
- A variety of factors have been described as correlates of gemcitabine resistance, including mutations of the dCK gene ( 1 , 10 - 13 ), low levels of dCK enzyme activity ( 7 , 14 ), and increased levels of the active metabolite gemcitabine triphosphate. (aacrjournals.org)
- After varying cycle numbers, the amount of polymerase, and the amount of deoxyribonucleotide triphosphates ( dNTPs ), it was found that restricting PCR amplification was best done by using a dNTP concentration of 3-12 [macro]mol/L. (thefreedictionary.com)
- Subsequently, dNMPs are phosphorylated into diphosphates (dNDPs) and triphosphates (dNTPs), which are the precursors of DNA. (embopress.org)
- Each of these analogs also inhibits an enzyme involved in deoxynucleotide metabolism resulting in depletion of at least one deoxynucleoside triphosphate pool. (springer.com)
- On transport into the cell, gemcitabine is phosphorylated to its mononucleotide moiety by deoxycytidine kinase (dCK), a rate-limiting enzyme in the salvage of deoxyribonucleosides that provides deoxynucleotide triphosphates for replicative and repair DNA synthesis. (aacrjournals.org)
- Arabinofuranosylcytosine triphosphate is a nucleotide that inhibits the synthesis of DNA by acting as an antimetabolic agent against deoxycytidine (a component of DNA). (wikipedia.org)
- Genetic PNP deficiency syndrome results in an accumulation of dGuo in plasma and deoxyguanosine triphosphate (dGTP) in T cells, thereby leading to dGTP-directed inhibition of DNA synthesis and cell death 4 with T cell-selective depletion as the main phenotype. (bloodjournal.org)
- This MNNG-induced in vitro DNA synthesis was inhibited by aphidicolin, but not by 2',3'-dideoxythymidine-5'-triphosphate. (nih.gov)
- As triphosphate analogs they can serve as substrates for nucleic acid synthesis and subsequent incorporation into DNA has been correlated with radiosensitization for bromo- and iododeoxyuridine. (springer.com)
- Minimum dose of fludarabine for the maximal modulation of 1-beta-D-arabinofuranosylcytosine triphosphate in human leukemia blasts during therapy. (aacrjournals.org)
- Our previous studies during therapy of acute myelogenous leukemia (AML) patients demonstrated that the accumulation of ara-CTP in circulating leukemia blasts was increased by a median of 2-fold when fludarabine (30 mg/m2/day over 30 min) was infused 4 h prior to intermediate dose ara-C. The augmentation was dependent on the cellular concentration of fludarabine triphosphate (F-ara-ATP). (aacrjournals.org)
- EGCG, EA, and RA dose-dependently inhibited the growth of human HL-60 promyelocytic leukemia cells, exerted strong free radical scavenging potential, and significantly imbalanced nuclear deoxyribonucleoside triphosphate ( dNTP ) concentrations without distinctly affecting the protein levels of RR subunits (R1, R2, p53R2). (thefreedictionary.com)
- The purified two active forms differed in chromatographic and electrophoretic behaviors, in their salt requirement for optimal activity, and in preference of template-primers, although both forms exhibited properties characteristic of DNA polymerase alpha such as sensitivity of N-ethylmaleimide, 1-beta-D-arabino-furanosylcytosine triphosphate, and aphidicolin. (nih.gov)
- Inhibition of hepatitis B virus deoxyribonucleic acid polymerase by the 5'-triphosphates of 9-beta-D-arabinofuranosyladenine and 1-beta-D-arabinofuranosylcytosine. (asm.org)
- 1-beta-d-Arabinofuranosylcytosine (ara-C), an effective drug for acute leukemias, must be phosphorylated to its 5'-triphosphate, ara-CTP, for activity. (aacrjournals.org)
- It is an antimetabolic agent with the chemical name of arabinofuranosylcytosine. (oncologydrugs.co.in)
- Liliemark, J. O., Plunkett, W. & Dixon, D. O. Relationship of 1-β-d-arabinofuranosylcytosine in claret to 1-β-d-arabinofuranosylcytosine 5′-triphosphate levels in leukemic beef during assay with high-dose 1-β-d-arabinofuranosylcytosine. (blakelivelybrasil.com)
- Other agents, such as 1-β-D-arabinofuranosylcytosine and hydroxyurea, which partly share mechanisms of action with gemcitabine by targeting DNA polymerases and ribonucleotide reductase, respectively, also caused an increase of DNA ligase I levels. (elsevier.com)
- Inhibitory effect of 1-beta-D-arabinofuranosylthymine 5'-triphosphate and 1-beta-D-arabinofuranosylcytosine 5'-triphosphate on DNA polymerases from murine cells and oncornavirus. (neb.com)
- Greco, W. R., Park, H. S., and Rustum, Y. M. Application of a new approach for the quantitation of drug synergism to the combination of cis -diamminedichloro-platinum and 1-D-arabinofuranosylcytosine. (springer.com)