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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

Avaliação da Atividade Antiviral de Extratos Vegetais e de Fungos contra Dengue Virus

Barbosa, Emerson de Castro January 2015 (has links)
Submitted by Nuzia Santos (nuzia@cpqrr.fiocruz.br) on 2016-04-12T19:03:42Z No. of bitstreams: 1 Dissertacao_BCM_EmersondeCastroBarbosa.pdf: 6431092 bytes, checksum: 15243f7b5580193cfc7b7ad5b935a77a (MD5) / Approved for entry into archive by Nuzia Santos (nuzia@cpqrr.fiocruz.br) on 2016-04-12T19:06:13Z (GMT) No. of bitstreams: 1 Dissertacao_BCM_EmersondeCastroBarbosa.pdf: 6431092 bytes, checksum: 15243f7b5580193cfc7b7ad5b935a77a (MD5) / Made available in DSpace on 2016-04-12T19:06:13Z (GMT). No. of bitstreams: 1 Dissertacao_BCM_EmersondeCastroBarbosa.pdf: 6431092 bytes, checksum: 15243f7b5580193cfc7b7ad5b935a77a (MD5) Previous issue date: 2015 / Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, Brasil / Produtos naturais são potenciais fontes alternativas para o desenvolvimento de antivirais para o tratamento da dengue, assim como de outras doenças causadas por vírus da família Flaviviridae ou mesmo para um amplo espectro de viroses. Neste estudo foi feita a triagem da atividade in vitro contra o Dengue virus 2 (DENV-2) de 3101 extratos, provenientes de plantas e de fungos da Coleção de Amostras para Bioensaios da Fiocruz. Para tal, células BHK-21 foram infectadas com DENV-2 e tratadas simultaneamente com 25 μg/mL de extrato sendo o resultado analisado por dois métodos: observação do grau de inibição do efeito citopático (ECP) por microscopia óptica e análise da viabilidade celular pelo ensaio colorimétrico do MTT. Dentre os 3101 extratos testados, 115 extratos apresentaram atividade antiviral contra DENV-2 e foram selecionados para a determinação da respectiva concentração efetiva 50 (CE 50). Cinquenta e cinco destes extratos foram obtidos de plantas pertencentes a 20 famílias distintas: Amaryllidaceae (3), Annonaceae (1), Asteraceae (5), Begoniaceae (1), Clusiaceae (1), Combretaceae (1), Erythroxylaceae (1), Fabaceae 4), Lythraceae (2), Malpighiaceae (8), Malvaceae (1), Melastomataceae (2), Melochia (1), Myrtaceae (3), Rubiaceae (8), Sapindaceae (9), Ochnaceae(1), Primulaceae (1), Vitaceae (1), Vochysiaceae (1). Os demais extratos (60) foram obtidos de culturas de fungos endofíticos coletados no Brasil, no continente Antártico e no Deserto do Atacama, ainda não identificados. Até o momento, os extratos vegetais mais promissores foram obtidos de plantas da família Amaryllidaceae (IS = 32,15) e da família Fabaceae (IS = 20,47) e (IS = 24,47). Vinte extratos fúngicos apresentaram valores de CE 50 que variaram entre 3,1 a 12,5 μg/mL e sem citotoxicidade aparente até a concentração de 100 μg/mL. Nossos resultados mostram que tais plantas e fungos são fontes promissoras de substâncias com ação antiviral contra DENV. / Natural products are potential alternat ive sources for the development of antiviral drugs for dengue treatment of, as well as for other diseases caused by viruses of the Flaviviridae family or even caused by a br oad spectrum of viruses. In this study, were performed an in vitro screening for activity against Dengue virus (DENV-2) of 3101 extracts fr om plants and fungi belonging to Fiocruz Minas extract sample collection. To this end, BHK-21 cells infected with DENV-2 were simultaneously treated with 25 μg/mL of extract and t he results analyzed by two methods: observing the degree of inhibiti on of DENV cytopathic effect (CPE) by optical microscopy and also by analysis of cell viability MTT colorimetric assay. Among the 3101 extracts tested, 115 extrac ts showed antiviral activity against DENV-2 and were selected for determination of its half maximal effective concentration (EC 50 ). Fifty-five of these extracts ar e taken from plants belonging to 20 different families: Amaryllidaceae (3), Annonaceae (1), Asteraceae (5), Begoniaceae (1), Clusiaceae (1), Combretaceae (1), Erythroxylaceae (1), Fabaceae (4), Lythraceae (2), Malpighiaceae (8), Malvaceae (1), Melastomataceae (2), Melochia (1), Myrtaceae (3), Rubiaceae (8), Sapindaceae (9), Ochnaceae (1), Primulaceae (1) Vitaceae (1), Vochysiaceae (1). The other extracts (60) were obtained from endophytic fungal cu ltures collected in Brazil, from Antarctic and the Atacama Desert soils, not identified yet. To date, the most promis ing plant extracts were obtained from plants of the Amaryllidaceae family (IS = 32.15) and Fabaceae (IS = 20.47) and (IS = 24.47). Twent y fungal extracts showed EC 50 values ranging from 3.1 to 12.5 mg/mL without any apparent cyt otoxicity up to the concentration of 100 μg/mL. Our results show that these pl ants and fungi are prom ising sources of substances with antiviral action against Dengue virus.

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