In this work, six triazene compounds are assayed to DNA cleavage activity. The same six triazenes and the drug Asercit® (dacarbazine) are assayed to antibacterial activity and toxicity to Artemia salina Leach.: 1,3-bis-(phenyl)triazene-1-N-hidroxide (T1), 1-(4-bromophenyl)-3-(4-nitrophenyl)triazene, (T2), 1-(4-azophenyl)-3-(4-nitrophenyl)triazene (T3) ,1,3-bis-(4-azophenyl-triazene) (T4), 1,3-bis-(2-bromophenyl)triazene (T5), 1-(4-carboxyphenyl)-3-(4-azophenyl)triazene (T6) and 5-(3,3-dimethyl-1-triazenyl)imidazol-4-carboxamide (dacarbazine, Asercit®). Triazene T1 cleaves approximately 50 % of plasmid DNA (pBSKII and pUC18, 3.75 mM, 50ºC/24 hours, Tris.HCl buffer 200 mM pH 8.0). Hydroxyl radical scavengers (glycerol 0.1 and 1.0 %, DMSO 0.04 M and tiourea 0.04 M) and argon atmosphere not interfere in DNA cleavage by T1. The Kb of T1 determinated by spectrofotometric titrations with DNA are 4.50 x 101 M-1 (pH 6,5), 1.00 x 102 M-1 (pH 7,0) e 2.33 x 102 M-1 (pH 8,0). T1, T6 and Asercit® are the more actives in antibacterial activity with CIM/CBM of even 16/64 μg/ml. LC50 more lower determinated by toxicity to A. salina are to T1 (0.081 ± 0.008 μg/ml), T5 (0.076 ± 0.011 μg/ml) and T6 (0.077 ± 0.007 μg/ml). Theses studies show the wide biological activity conferred by triazene compounds. / Neste estudo, seis compostos triazenos são avaliados quanto à atividade de clivagem do DNA. Os mesmos seis triazenos e o medicamento Asercit® (dacarbazina) são avaliados quanto à atividade antibacteriana e toxicidade frente à Artemia salina Leach.: 1,3-bis-(fenil)triazeno-1-N-hidróxido (T1), 1-(4-bromofenil)-3- (4-nitrofenil)triazeno (T2), 1-(4-azofenil)-3-(4-nitrofenil)triazeno (T3), 1,3-bis-(4- azofenil)triazeno (T4), 1,3-bis-(2-bromofenil)triazeno (T5), 1-(4-carbóxifenil)-3-(4-
azofenil)triazeno (T6) e 5-(3,3-dimetil-1-triazenil)imidazol-4-carboxamida (dacarbazina, Asercit®). O triazeno T1 cliva aproximadamente 50 % do DNA plasmidial (pBSKII e pUC18, a 3,75 mM, 50 ºC/24 horas, tampão Tris.HCl 200 mM
pH 8,0). Seqüestradores de radicais hidroxil (glicerol 0,1 e 1 %, DMSO 0,04 M e tiouréia 0,04 M) e atmosfera de argônio não interferem na clivagem do DNA por T1. Os Kb de T1 determinados por titulação espectrofotométrica com DNA são 4,50 x 101 M-1 (pH 6,5), 1,00 x 102 M-1 (pH 7,0) e 2,33 x 102 M-1 (pH 8,0). T1, T6 e o Asercit® são os mais ativos na atividade antibacteriana com CIM/CBM de até 16/64 μg/ml. As
LC50 mais baixas determinadas pela toxicidade para A. salina são para T1 (0,081 ± 0,008 μg/ml), T5 (0,076 ± 0,011 μg/ml) e T6 (0,077 ± 0,007 μg/ml). Esses estudos mostram a ampla atividade biológica conferida pelos compostos triazenos.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufsm.br:1/5874 |
| Date | 13 December 2007 |
| Creators | Paraginski, Gustavo Luiz |
| Contributors | Horner, Rosmari, Manfron, Melânia Palermo, Hörner, Manfredo |
| Publisher | Universidade Federal de Santa Maria, Programa de Pós-Graduação em Ciências Farmacêuticas, UFSM, BR, Farmacologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFSM, instname:Universidade Federal de Santa Maria, instacron:UFSM |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 201000000000, 400, 300, 300, 500, 500, 5fdaffc5-abc5-4607-8952-fc5c4760b004, b244639b-72cf-4b1f-b302-b49cde1ae739, 2bc33d24-7b74-400b-bd0f-7469f908d7a4, fbc928b5-4959-4411-a1cd-dc19be356252 |
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