Detalhes bibliográficos
| Ano de defesa: |
2015 |
| Autor(a) principal: |
Pimenta, Vanessa de Sousa Cruz
 |
| Orientador(a): |
Araújo, Eugênio Gonçalves de
|
| Banca de defesa: |
Araújo, Eugênio Gonçalves de,
Bianchi Filho, Cesario,
Miguel, Marina Pacheco,
Araújo, Luciana Batalha de Miranda,
Damasceno, Adilson Donizeti |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Goiás
|
| Programa de Pós-Graduação: |
Programa de Pós-graduação em Ciência Animal (EVZ)
|
| Departamento: |
Escola de Veterinária e Zootecnia - EVZ (RG)
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://repositorio.bc.ufg.br/tede/handle/tede/5143
|
Resumo: |
Osteosarcoma is the most diagnosed primary bone cell tumor in dogs and humans. The need for more effective drugs with less intense collateral effect has triggered the development of plant-derived, natural-source chemotherapeutics. This study aimed to verify β lapachone intracellular effects on canine osteosarcoma cultured cells, as well as identify action mechanisms related to its antiproliferative properties. Cells were obtained from a cell line bank, sub cultivated and subjected to treatment with different β lapachone concentrations, followed by tetrazolium reduction, Tripan Blue dye exclusion assay, clongenic survival assay, Annexin V-FITC and propidium iodine double-labeling, JC-1 dye labeling and cell cycle kinetics analysis. The group treated with β lapachone for 72 hours showed the lowest cell viability, 27,74%, and the most conspicuous citotoxic effect, 64,81%, at 0,3 μM concentration; lower IC50, 0,180 μM and also the lowest cell growth - 0,50%- following treatment with 1,0 μM concentration. No statistical difference for cell proliferation was verified between concentrations after β lapachone exposure.Early apoptosis was the most frequent type of cell death considering all groups. It was less frequent in the 24-hour group treated with 0,1 μM (4,26 %) and more frequent in the 72-hour group treated with 1,0 μM (85,89 %). Mitochondrial depolarization was dose-dependent. Cell growth inhibition was carried out through cycle block at G0/G1 phase, according to exposure time. β lapachone was shown to have antiproliferative and cytotoxic effects, to induce apoptosis and to block cell cycle at G0/G1 phase on canine osteosarcoma cells. |
