Avaliação da toxicidade de tiossemicarbazonas derivadas de benzaldeído, acetofenona e benzofenona frente a larvas de Aedes aegypti

• Main Author: Gorssi, Jenifer Carvalho
• Other Authors: Silva, Jeferson Gomes da
• Language: Portuguese
• Published: Universidade Federal de Juiz de Fora - Campus Avançado de Governador Valadares 2018
• Subjects: CNPQ::CIENCIAS BIOLOGICAS::BIOQUIMICA; Tiossemicarbazonas; Atividade larvicida; Aedes aegypti; Thiosemicarbazones; Larvicidal activity
• Online Access: https://repositorio.ufjf.br/jspui/handle/ufjf/6830

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No. of bitstreams: 1 jenifercarvalhogorssi.pdf: 6998133 bytes, checksum: f49277dca971587203cbebb23396270d (MD5) Previous issue date: 2018-03-26 === As tiossemicarbazonas são uma classe de compostos químicos com amplo perfil farmacológico, contudo há poucos estudos sobre sua toxicidade em insetos. O Aedes aegypti (Linnaeus, 1762) é na atualidade um dos mosquitos que mais tem causado problemas de saúde pública, devido ao seu potencial de disseminar doenças, como dengue, febre amarela, chikungunya e zika. Entre as estratégias mais eficientes no controle dessas doenças está o combate ao vetor. No entanto, o número limitado de agentes larvicidas e o surgimento de mosquitos resistentes podem comprometer esse combate, o que tem motivado a busca por novas moléculas que podem atuar como larvicidas. Neste trabalho foi avaliada a toxicidade de uma série de quatorze tiossemicarbazonas derivadas de benzaldeído, acetofenona e benzofenona contra larvas do Aedes aegypti. Os compostos foram preparados e caracterizados a partir de seus espectros de infravermelho e ressonância magnética nuclear, bem como, por sua estabilidade coloidal em solução aquosa com dimetilsulfóxido 1%. A toxicidade dos compostos em concentrações na faixa de 0,1 a 100 μM foi avaliada frente a larvas no estádio L4, sendo demonstrado que as tiossemicarbazonas derivadas de benzofenona apresentam atividade larvicida. O comportamento de nado e a morfologia externa e das células do intestino médio foram avaliados para os compostos que apresentaram atividade larvicida, sendo observado a redução da mobilidade, deformidade de algumas larvas e alterações nas células após a exposição com tiossemicarbazonas. Ensaios de imunofluorescência utilizando os anticorpos anti-fosfohistona H3, anti-proteína de cadeia leve 3 associada a microtúbulos (anti-LC3A/B), anti-caspase-3 e anti-peroxidase foram realizados nas células do intestino médio das larvas. Esses resultados ressaltaram o efeito citotóxico das tiossemicarbazonas, contudo sem a participação dos processos de apoptose, autofagia e de enzimas peroxidase. Os resultados obtidos corroboram a potencial atividade larvicida das tiossemicarbazonas, mas a origem da sua citotoxicidade deve ser melhor investigada. === The thiosemicarbazones are a class of chemical compounds with broad pharmacological profile, however, there is few studies on its toxicity in insects. Currently, Aedes aegypti mosquitoes (Linnaeus, 1762) has caused public health problems due to its potential for disease dissemination, such as dengue fever, yellow fever, chikungunya and zika. The fight against the vector is one of most efficient strategies used in the control of these diseases. However, the limited number of larvicidal agents and the emergence of resistant mosquitoes can compromise this fight, which has motivated the research for new molecules that can act as larvicides. In this work, a series of fourteen thiosemicarbazones derived from benzaldehyde, acetophenone and benzophenone against Aedes aegypti larvae were evaluated. The compounds were prepared and characterized by their infrared and nuclear magnetic resonance spectra as well as its colloidal stability in 1% DMSO aqueous solution. The larvicidal activity of the compounds, at concentration range from 0.1 to 100 μM, was evaluated against larvae in the L4 stage, being that benzophenone-derived thiosemicarbazones demonstrated larvicidal activity. The swimming behavior and external and midgut cells morphology were evaluated for the active compounds. In these experiments were observed a reduction of mobility, deformity of some larvae and alterations in cells upon exposition to thiosemicarbazones. Immunofluorescence assays involving anti-phospho-histone H3, microtubule-associated protein light chain 3 antibody (anti-LC3A/B), anti-caspase 3, and anti-peroxidase antibodies were performed on midgut cells from larvae. These results highlight the cytotoxic effect of thiosemicarbazones, but without the participation of apoptotic and autophagic processes and peroxidase enzymes. The results obtained corroborate a potential larvicidal activity of thiosemicarbazones, however, the origin of its cytotoxicity should be better investigated.