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Master thesis . 2015
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Fluoroquinolonas como inibidoras das topoisomerases de Leishmania infantum

Authors: Pereira, Octávio José Carraça;

Fluoroquinolonas como inibidoras das topoisomerases de Leishmania infantum

Abstract

A leishmaniose é uma das principais doenças negligenciadas, com uma incidência de 1,3 milhões de casos anuais em humanos, dos quais se estima que resultem 20 mil a 30 mil fatalidades. O objectivo deste estudo foi avaliar a eficácia de 12 fluoroquinolonas, 2 isoflavonas e 1 aminocumarina na inibição do crescimento e efeito citotóxico de promastigotas de Leishmania infantum cultivados axenicamente. Os parasitas foram obtidos de animais diagnosticados com leishmaniose e cultivados em meio RPMI-1640 enriquecido com hemina, aminoácidos essenciais e urina humana, de acordo com uma adaptação dos métodos descritos na bibliografia, e incubados num dispositivo de baixo custo, construído para o efeito. As subculturas em fase logarímica foram tratadas durante 7 dias com 5 concentrações dos compostos. O grupo de controlo foi tratado com 3 concentrações de antimoniato de n-metilglucamina. Os efeitos foram medidos através da alteração da absorvência do meio de cultura após reacção de conversão de MTS, e por observação (microscopia óptica) de alterações morfométricas dos promastigotas. Nos testes a Balofloxacina, a Gemifloxacina e a Clinafloxacina mostraram os efeitos mais marcantes e LC50 menores. Os resultados sugerem o interesse no desenvolvimento de futuros testes in vitro e in vivo.

ABSTRACT - Leishmaniasis is one of the major neglected diseases, with an incidence of 1,3 million human cases annualy, of which an estimated 20.000 to 30.000 outcome in death. The aim of this study was to investigate the efficacy of 12 fluoroquinolones, 2 isoflavones and 1 aminocumarine in inhibiting the growth and possible cytotoxic effect on axenically grown Leishmania infantum promastigotes. The parasites were obtained from animals diagnosed with leishmaniasis and maintained in RPMI-1640 medium, supplemented with hemin, essential amino acids and human urine, in an adaptadion of methods previously described, and incubated in a purpose-built low cost device. Subcultures in log-phase were treated for 7 days with 5 fluoroquinolones concentrations. The control group was treated with 3 concentrations of meglumine antimoniate.. The effects were measured using the change in absorbance of the culture medium after MTS conversion reaction, and by optical microscopy observation of the morphometric changes in the promastigote population. In tests, Balofloxacine, Gemifloxacine and Clinafloxacine showed the most marked effects and lower LC50. The results suggest the interest in developing future tests in vitro and in vivo.

Dissertação de Mestrado Integrado em Medicina Veterinária

Country
Portugal
Keywords

Topoisomerase, Fluoroquinolone, Leishmaniose, Leishmaniosis, Leishmania infantum, Fluoroquinolona

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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