2016-01-212015-03-27PIMENTA, VANESSA DE S. C. Propriedades citotóxicas daβ lapachona em células de osteossarcoma caninoin vitro. 2015. 69 f. Tese (Doutorado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2015.http://repositorio.bc.ufg.br/tede/handle/tede/5143Osteosarcoma 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.application/pdfAcesso AbertoCãesCultivo celularMétodos molecularesNeoplasia ósseaQuinonasBone tumorsCell cultureDogsMolecular methodsQuinonesCLINICA E CIRURGIA ANIMAL::CLINICA CIRURGICA ANIMALTese