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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

Ação biológica in vitro de tiossemicarbazonas derivadas de canfeno e limoneno em células de melanoma humano (SK-MEL-37)

Passos, Débora Cristina Silva dos 16 May 2013 (has links)
Submitted by Erika Demachki (erikademachki@gmail.com) on 2014-10-22T16:44:26Z No. of bitstreams: 4 Tese - Débora Cristina Silva dos Passos - 2013 - Parte 01.pdf: 10357491 bytes, checksum: 1678b4aad93bca319ee5ddb93d3808bc (MD5) Tese - Débora Cristina Silva dos Passos - 2013 - Parte 02.pdf: 9533486 bytes, checksum: ad5e21870e09f4f46a3045a69996aed3 (MD5) Tese - Débora Cristina Silva dos Passos - 2013 - Parte 03.pdf: 8695341 bytes, checksum: 5f8d696c0a73f923cb129f3c0aa1e4b7 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2014-10-22T19:00:24Z (GMT) No. of bitstreams: 4 Tese - Débora Cristina Silva dos Passos - 2013 - Parte 01.pdf: 10357491 bytes, checksum: 1678b4aad93bca319ee5ddb93d3808bc (MD5) Tese - Débora Cristina Silva dos Passos - 2013 - Parte 02.pdf: 9533486 bytes, checksum: ad5e21870e09f4f46a3045a69996aed3 (MD5) Tese - Débora Cristina Silva dos Passos - 2013 - Parte 03.pdf: 8695341 bytes, checksum: 5f8d696c0a73f923cb129f3c0aa1e4b7 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-10-22T19:00:24Z (GMT). No. of bitstreams: 4 Tese - Débora Cristina Silva dos Passos - 2013 - Parte 01.pdf: 10357491 bytes, checksum: 1678b4aad93bca319ee5ddb93d3808bc (MD5) Tese - Débora Cristina Silva dos Passos - 2013 - Parte 02.pdf: 9533486 bytes, checksum: ad5e21870e09f4f46a3045a69996aed3 (MD5) Tese - Débora Cristina Silva dos Passos - 2013 - Parte 03.pdf: 8695341 bytes, checksum: 5f8d696c0a73f923cb129f3c0aa1e4b7 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2013-05-16 / Melanoma is a type of cancer that arises from melanocytes and is notoriously resistant to radiation and chemotherapy. The thiosemicarbazones are synthetic compounds with marked biological properties such as antibacterial, antiviral, antiprotozoal and antitumor and previous studies have demonstrated cytotoxic activity against the human melanoma cells, so in this study, we evaluated the antiproliferative activity, the enzymatic activity of Caspases 2, 3, 6, 8, 9, the effect on the cell cycle gene expression levels of caspases 2, 3, 6, 8, 9, Apaf-1 and microscopic morphological changes in human melanoma cells (SK -MEL-37) twenty one monoterpene derived from natural thiosemicarbazone (-) - camphene: camphene, benzaldehyde, benzophenone, menthone, ethyl pyruvate, p-nitroacetophenone, pchloroacetophenone, p-methoxyacetophenone, p-methylacetophenone, p fluoracetofenona-phidroxiacetofena, furan, 3-methoxy-4-hydroxybenzaldehyde, p-fluorbenzaldehyde, 2- hydroxybenzaldehyde, cinnamic aldehyde, thiophene-2-carboxaldehyde, 1-H-imidazole-4- carboxaldehyde, tiossemicaroazida and six montoterpeno natural R-(+)-limonene: benzaldehyde, thiosemicarbazide, o-nitro, m-nitro, p-nitro, p-hydroxy and p-dimethylamino. The values found for the inhibitory concentration for 50% of cells (IC50) were between 12 μM and 55 μM. The percentage of cells in phase and in phase G0/G1 decreased SG2 / M increased after forty-eight hours of incubation with benzaldehyde thio-camphene, limonene thio-benzaldehyde, m-nitro, p-hydroxy and thiosemicarbazide increased indicating that the growth inhibitory effect might be also due to arrest of cells at S-G2/M phase. We observed increased activity of caspase 3 (m-nitro thio-limonene), 6 (camphene thio-benzaldehyde and p-hydroxy thio-limonene) and 8 (thio-benzaldehyde limonene). Late apoptotic features were detected in 62% of cells treated with benzaldehyde thio-camphene and morphological changes typical of apoptosis were visualized by fluorescence microscopy and scanning electron microscopy (SEM) after treatment with benzaldehyde thio-camphene chosen due to their low IC50 value (12 mM). It was observed gene expression of caspases 2, 3, 6, 8 and Apaf-1 in cells treated with benzaldehyde thio-camphene indicating the participation of these enzymes in the anti-proliferative effect observed. Our results indicate that the thiosemicarbazones derivatives can inhibit proliferation, regulate cell cycle, induce apoptosis of human melanoma cells (SK-MEL-37) and could be an candidate for future preclinical in vivo studies. / O melanoma é um tipo de câncer que surge nos melanócitos e é notoriamente resistente à radioterapia e quimioterapia. As tiossemicarbazonas são compostos sintéticos com marcantes propriedades biológicas tais como antibacteriana, antiviral, antiprotozoária e antitumoral e em estudos anteriores demonstraram ação citotóxica frente à celulas de melanoma humano, por isso, neste estudo, foi avaliada a atividade anti-proliferativa, a atividade enzimática das caspases 2, 3, 6, 8, 9, o efeito no ciclo celular, os níveis de expressão gênica das caspases 2, 3, 6, 8, 9, Apaf-1 e as alterações morfológicas por microscopia em células de melanoma humano (SK-MEL-37) de vinte e uma tiossemicarbazonas derivadas do monoterpeno natural (-)- canfeno: canfeno, benzaldeído, benzofenona, mentona, etil piruvato, acetofenona, pnitroacetofenona, p-cloroacetofenona, p-metoxiacetofenona, p-metilacetofenona, pfluoracetofenona, p-hidroxiacetofena, furano, 3-metóxi-4-hidroxibenzaldeído, pfluorbenzaldeído, 2-hidroxibenzaldeído, aldeído cinâmico, tiofeno-2-carboxialdeído, 1-Himidazol- 4-carboxialdeído, tiossemicaroazida, bem como seis do montoterpeno natural R-(+)- limoneno: benzaldeído, tiossemicarbazida, o-nitro, m-nitro, p-nitro, p-dimetilamino e phidróxi . Os valores encontrados para a concentração inibitória para 50% das células (IC50) situaram-se entre 12 μM e 55 μM. A porcentagem de células na fase G0/G1diminuiu e na fase SG2/M aumentou após quarenta e oito horas de incubação com o benzaldeído tio-canfeno, benzaldeído tio-limoneno, m-nitro, p-hidróxi e tiossemicarbazida, indicando que o efeito antiproliferativo observado pode ser devido a uma interrupção das células na fase SG2/M. Observou-se uma maior atividade de caspase 3 (m-nitro tio-limoneno), 6 (benzaldeído tiocanfeno e p-hidróxi tio-limoneno) e 8 (benzaldeído tio-limoneno). Características apoptóticas tardias foram detectados em 62% das células tratadas com benzaldeído tio-canfeno e as alterações morfológicas típicas de processo de apoptose foram visualizadas através da microscopia de fluorescência e de microscopia eletrônica de varredura (MEV) após tratamento com o benzaldeído tio-canfeno escolhido devido ao seu baixo valor de IC50 (12 μM). Observou-se a expressão gênica das caspases 2, 3, 6, 8 e o apaf-1 nas células tratadas com benzaldeído tio-canfeno indicando a participação dessas enzimas no efeito antiproliferativo observado. Os resultados indicam que as tiossemicarbazonas derivadas de canfeno e limoneno podem inibir a proliferação celular, regular o ciclo celular e induzir apoptose nas células de melanoma humano (SK-MEL-37), portanto, podem ser considerados candidatos para futuros ensaios pré-clínico in vivo.

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