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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Síntese e avaliação anti-Leishmania de novos derivados híbridos tiofênicos-acridínicos / Synthesis and evaluation anti-Leishmania of new derivatives hybrids acridines-thiophenics

Serafim, Vanessa de Lima 17 June 2016 (has links)
Submitted by Vasti Diniz (vastijpa@hotmail.com) on 2017-09-08T13:15:26Z No. of bitstreams: 1 arquivototal.pdf: 5193646 bytes, checksum: 62212dade111b2d7405b6107b2b692aa (MD5) / Made available in DSpace on 2017-09-08T13:15:26Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 5193646 bytes, checksum: 62212dade111b2d7405b6107b2b692aa (MD5) Previous issue date: 2016-06-17 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Leishmaniasis is a group of diseases caused by protozoa of the genus Leishmania, transmitted by sand flies insects. As recommended treatments are toxic and not very satisfactory, it is necessary to find new drugs more effective against the parasite and that have low toxicity to the host. In this context, this study aimed to synthesize, structurally elucidate and evaluate the anti-Leishmania potential novel hybrids thiophenics-acridines front of promastigotes of Leishmania (L.) amazonensis. In this study, we evaluated 23 compounds, of which 14 were derived hybrids. The synthesis of compounds had a yield from 47.7% (ACT06) to 88% (ACT05) to ACT series, and ACS series from 44.8% (ACS05) to 94.9% (ACS02). All compounds of ACS series showed antipromastigote activity (IC50 values from 3.9 to 30.9 μg/mL). Differently, hybrids of ACT series no showed antiparasitic activity. None of the derivatives showed cytotoxicity to erythrocytes of human origin, as compared to reference drug. The compounds with improved activity, ACS01 and ACS02 (IC50 3.9 and 4.6 μg/mL; SI 205.1 and 173.9 respectively) were selected to proceed with the investigation. ACS01 and ACS02 were effective against strains resistant trivalent antimony in the same way as in sensitive strains. Furthermore, the activity of ACS01is not associated with parasite DNA fragmentation, but ACS01 and ACS02 showed a binding constant of 104 M-1, demonstrating their DNA intercalation capacity. Thus, these results suggest that the derivatives of the ACS series are possible drug candidates for the therapy of leishmaniasis. / As leishmanioses são um conjunto de doenças causadas por protozoários do gênero Leishmania, transmitidas por insetos flebotomíneos. Como os tratamentos recomendados são tóxicos e pouco satisfatórios, faz-se necessário encontrar novas drogas, mais eficazes contra o parasito e que tenham baixa toxicidade para o hospedeiro. Neste contexto, este trabalho buscou sintetizar, elucidar estruturalmente, e avaliar o potencial anti-Leishmania de novos derivados híbridos tiofênicos-acridínicos frente às formas promastigotas de Leishmania (L.) amazonensis. Neste estudo, foram avaliados 23 compostos, dos quais 14 derivados são híbridos. A síntese dos compostos apresentou rendimento de 47,7% (ACT06) a 88% (ACT05) para série ACT, e na ACS de 44,8% (ACS05) a 94,9% (ACS02). Todos os compostos da série ACS apresentaram atividade antipromastigota (IC50 de 3,9 a 30,9 μg/mL). De modo diferente, os derivados da série ACT não apresentaram atividade antiparasitária. Nenhum dos derivados apresentou citotoxicidade para hemácias de origem humana, comparados às drogas de referência. Os compostos com melhor atividade, ACS01 e ACS02 (IC50 = 3,9 e 4,6 μg/mL; IS = 205,1 e 173,9 respectivamente) foram selecionados para prosseguir com a investigação. ACS01 e ACS02 foram eficazes contra cepas resistentes ao antimonial trivalente da mesma forma que nas culturas sensíveis. Além do mais, a atividade do ACS01 não está associada à fragmentação do DNA do parasito, porém ACS01 e ACS02 apresentaram uma constante de ligação de 104 M-1, demonstrando sua capacidade de intercalação ao DNA. Assim, estes resultados sugerem que os derivados da série ACS são possíveis candidatos a fármacos para a terapêutica das leishmanioses.

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