Topoisomerase I Inhibitor
Mostrando 1-12 de 63 artigos, teses e dissertações.
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1. Antitumor activity of irinotecan with ellagic acid in C6 glioma cells
SUMMARY OBJECTIVE: Irinotecan-based combination chemotherapies in malignant gliomas need to be examined. The aim of this study was to investigate the synergetic effect of ellagic acid, a natural polyphenolic antioxidant compound, with irinotecan, an inhibitor of topoisomerase I enzyme, on the growth, cadherin switch, and angiogenic processes of a glioma cel
Revista da Associação Médica Brasileira. Publicado em: 2022
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2. Estudo do potencial anticÃncer de novos derivados acridÃnicos sintÃticos em modelos experimentais in vitro. / Study of the potential of new anticancer synthetic acridine derivatives in experimental models in vitro.
Acridines are planar aromatic polycyclic molecules that have the ability to progress in nuclear DNA. Many of its representatives have antibacterial, antiparasitic and antitumor. This study evaluated the cytotoxic potential of 22 new acridine compounds in strains of human tumor cells. Among these, four compounds [5-(acridin-9-yl-methilene)-3-(4-methyl-benzyl)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/01/2010
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3. Irinotecan and oxaliplain : an overview of the novel chemotherapeutic options for the treatment of advanced colorectal cancer
Colorectal cancer is one of the most frequent malignancies in humans and an important cause of cancer death. Metastatic colorectal cancer remains incurable with available systemic therapeutic options. The most active cytotoxic drug against this malignancy, the antimetabolite 5-fluorouracil, was developed more than forty years ago, and as a single agent produ
Publicado em: 2010
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4. Increase in mitotic recombination in diploid cells of Aspergillus nidulans in response to ethidium bromide
Ethidium bromide (EB) is an intercalating inhibitor of topoisomerase II and its activities are related to chemotherapeutic drugs used in anti-cancer treatments. EB promotes several genotoxic effects in exposed cells by stabilising the DNA-enzyme complex. The recombinagenic potential of EB was evaluated in our in vivo study by the loss of heterozygosity of nu
Genetics and Molecular Biology. Publicado em: 2003
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5. Irinotecan and oxaliplatin: an overview of the novel chemotherapeutic options for the treatment of advanced colorectal cancer
Colorectal cancer is one of the most frequent malignancies in humans and an important cause of cancer death. Metastatic colorectal cancer remains incurable with available systemic therapeutic options. The most active cytotoxic drug against this malignancy, the antimetabolite 5-fluorouracil, was developed more than forty years ago, and as a single agent produ
Brazilian Journal of Medical and Biological Research. Publicado em: 2001-09
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6. Novobiocin inhibits RNA polymerase III transcription in vitro by a mechanism distinct from DNA topoisomerase II.
The role of DNA topoisomerases in eucaryotic class III gene transcription in vitro has been studied through the use of inhibitory drugs and antisera to DNA topoisomerases I and II. The DNA topoisomerase II inhibitors, novobiocin and coumermycin AI, were found to inhibit transcription of cloned 5S and tRNA genes. Novobiocin acts by interfering with an ATP-req
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7. Sequence-specific transactivators counteract topoisomerase II-mediated inhibition of in vitro transcription by RNA polymerases I and II.
An inhibitor of RNA polymerase II transcription in vitro has been purified from HeLa cell nuclear extracts. Partial amino acid sequences derived from the purified protein revealed that the inhibitor of transcription corresponded to human topoisomerase II. Order of addition experiments provided evidence indicating that topoisomerase II inhibited transcription
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8. Comparison of effects of fostriecin, novobiocin, and camptothecin, inhibitors of DNA topoisomerases, on DNA replication and repair in human cells.
Fostriecin causes a delayed inhibition of replicative DNA synthesis in human cells, consistent with a role for DNA topoisomerase II (its target enzyme) at a late stage in replication. Fostriecin does not inhibit UV-induced excision repair. The less specific inhibitor novobiocin blocks repair in permeabilised cells given a low dose of UV, presumably through a
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9. Pea DNA Topoisomerase I Is Phosphorylated and Stimulated by Casein Kinase 2 and Protein Kinase C
DNA topoisomerase I catalyzes the relaxation of superhelical DNA tension and is vital for DNA metabolism; therefore, it is essential for growth and development of plants. Here, we have studied the phosphorylation-dependent regulation of topoisomerase I from pea (Pisum sativum). The purified enzyme did not show autophosphorylation but was phosphorylated i
The American Society for Plant Biologists.
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10. Camptothecin, a specific inhibitor of type I DNA topoisomerase, induces DNA breakage at replication forks.
The structure of replicating simian virus 40 minichromosomes, extracted from camptothecin-treated infected cells, was investigated by biochemical and electron microscopic methods. We found that camptothecin frequently induced breaks at replication forks close to the replicative growth points. Replication branches were disrupted at about equal frequencies at
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11. Effects of VM26, a specific inhibitor of type II DNA topoisomerase, on SV40 chromatin replication in vitro.
We have examined the influence of VM26 (teniposide), a specific inhibitor of mammalian type II DNA topoisomerase, on the replication of SV40 minichromosomes in vitro. The replication system we used consists of replicative intermediate SV40 chromatin as substrate which is converted to mature SV40 chromatin in the presence of ATP, deoxynucleotides and a protei
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12. Transcriptional Consequences of Topoisomerase Inhibition
In principle, the generation, transmission, and dissipation of supercoiling forces are determined by the arrangement of the physical barriers defining topological boundaries and the disposition of enzymes creating (polymerases and helicases, etc.) or releasing (topoisomerases) torsional strain in DNA. These features are likely to be characteristic for indivi
American Society for Microbiology.