Topoisomerase Ii
Mostrando 1-12 de 488 artigos, teses e dissertações.
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1. Diacetate Naphthoquinone Derivatives Tethered to 1,2,3-Triazoles: Synthesis and Cytotoxicity Evaluation in Caco-2 Cells
Acetylated compounds prepared from naphthoquinones have been reported as antitumoral prodrugs. Exploring the synthetic versatility of the naphthoquinone and triazolic nuclei, herein we report a simple and efficient synthetic route to prepare a series of sixteen prodrugs prototype of 1,2,3-triazoles-naphthoquinodoic acetyl derivatives. The compounds 10a-10h a
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Ruthenium(II)-mercapto Complexes with Anticancer Activity Interact with Topoisomerase IB
Herein we present four new ruthenium(II) complexes: [Ru(mtz)2(dppb)] (1), [Ru(mmi)2(dppb)] (2), [Ru(dmp)2(dppb)] (3), and [Ru(mpca)2(dppb)] (4), where mtz = 2-mercaptothiazoline; mmi = 2-mercapto-1-methyl-imidazole; dmp = 4,6-diamino-2-mercaptopyrimidine; mpca = 6-mercaptopyridine-3-carboxylic acid; dppb = 1,4-bis(diphenylphosphino)butane. In vitro cell cult
J. Braz. Chem. Soc.. Publicado em: 2020-03
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3. Synthesis, Antitumor Activity and Docking of 2,3-(Substituted)-1,4-Naphthoquinone Derivatives Containing Nitrogen, Oxygen and Sulfur
Eleven 2,3-(substituted)-1,4-naphthoquinone derivatives were synthesized in yields ranging from 52-89%. These derivatives were evaluated for their cytotoxic effects on human lungs (H460), triple-negative breast (MDA-MB-231) and ovarian (A2780) cancer cell lines. Compounds 5f and 8 showed IC50values of 3.048 × 10-5 mol L-1 and 4.24 × 10-6 mol L-1 for H460;
J. Braz. Chem. Soc.. Publicado em: 2015-09
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4. Efficient one pot synthesis of xanthene-triazole-quinoline/phenyl conjugates and evaluation of their antimicrobial activity
Novos conjugados xanteno-triazol-quinolina/fenila foram sintetizados via condensação ecologicamente amigável one pot de três componentes, 12-aril-2-hidroxi-tetrahidrobenzo[a]xanteno-11-ona, brometo propargílico e 4-azido-7-cloroquinolina/fenil azida usando polietilenoglicol 400 (PEG-400) como meio de reação, com o intuito de explorar seu efeito no cre
J. Braz. Chem. Soc.. Publicado em: 2014-07
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5. Estudo químico dos organismos marinhos Aplysina fistularis Pallas e Sargassum polyceratium Montagne.
As algas e as esponjas marinhas têm sido alvos de pesquisas científicas importantes nos últimos 50 anos, de onde foram isolados e caracterizados um grande número de metabólitos secundários, com ampla variedade estrutural, determinadas substâncias podem caracterizar as classes de algas e esponjas, fato de grande importância para os químicos, taxonomi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/08/2012
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6. Neolignans from Licaria chrysophylla and Licaria aurea with DNA topoisomerase II-α inhibitory activity
Seven natural neolignans isolated from Licaria chrysophylla and Licaria aurea along with five semisynthetic derivatives were tested for their inhibitory action on DNA-topoisomerase by relaxation assays on pBR322 plasmid DNA. All compounds tested showed strong inhibition at a concentration of 100 µM, while none showed activity between 5 and 70 µM. These res
Quím. Nova. Publicado em: 2012
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7. Phaeophytins from Thyrsacanthus ramosissimus Moric. with inhibitory activity on human dna topoisomerase II-α
Our study reports the extraction and isolation of a new phaeophytin derivative 15¹-hydroxy-(15¹-S)-porphyrinolactone, designated anamariaine (1) herein, isolated from the chloroform fraction of aerial parts of Thyrsacanthus ramosissimus Moric. along with the known 15¹-ethoxy-(15¹-S)-porphyrinolactone (2). These compounds were identified by usual spectros
Quím. Nova. Publicado em: 2012
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8. Aplysfistularine: a novel dibromotyrosine derivative isolated from Aplysina fistularis
The new dibromotyrosine derivative 3,5-dibromo-4-[3'dimethylamonium]propoxyphenyl]-N,N,N-trimethylethanamonium, here referred to as aplysfistularine (1), was isolated from the marine sponge Aplysina fistularis along with 2-(3,5-dibromo-4methoxyphenyl)-N,N,N-trimethylethanamonium (2), aplysterol (3) and 24,28-didehydroaplysterol (4). Their identification was
Quím. Nova. Publicado em: 2012
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9. Cinética celular na endometriose profunda infiltrativa de reto-sigmoide: estudo anátomo-clínico / Cell kinetics in deep infiltrating endometriosis of rectosigmoid: an anatomoclinical study
INTRODUÇÃO: A endometriose, uma doença benigna, tem características invasivas com potencial proliferativo. O desenvolvimento das lesões pode ocorrer em decorrência de crescimento celular glandular e/ou estromal ou de alterações na cinética celular. Cinética celular refere-se ao equilíbrio entre a morte celular, ou apoptose, e a proliferação celu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/09/2011
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10. Avaliação da Bioatividade de Lignóides na Inibição da Topoisomerase II-a Humana
A Topoisomerase II está envolvida em diversos processos celulares vitais, como a replicação e a transcrição do DNA, além da segregação dos cromossomos. Essa enzima catalisa mudanças na topologia do DNA através de rupturas temporárias e posterior rearranjo da dupla hélice, sendo fundamental para que ocorra a proliferação celular. Muitos composto
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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11. Karyotypic and fluorescent in-situ hybridization study of the centromere of chromosome 7 in secondary myeloid neoplasms
BACKGROUND: Secondary myeloid neoplasms comprise a group of secondary diseases following exposure to myelotoxic agents or due to congenital diseases. The improvement of anticancer agents and immunosuppressive drugs seem to be associated with an increased incidence of secondary myeloid neoplasms. Karyotyping of bone marrow is essential for diagnosis and progn
Revista Brasileira de Hematologia e Hemoterapia. Publicado em: 2011-12
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12. Validation of a spectrophotometric method to estimate the adsorption on nanoemulsions of an antimalarial oligonucleotide
This study describes the validation of a spectrophotometric method to estimate oligonucleotides association with cationic nanoemulsions. Phosphodiester and phosphorothioate oligonucleotides targeting Plasmodium falciparum topoisomerase II were analyzed at 262 nm. Linear response (r > 0.998) was observed from 0.4 to 1.0 nmol/mL, the relative standard deviatio
Química Nova. Publicado em: 2011-09