Oksaliplatin ve 5-florourasilin CACO-2 kanser hücrelerinde toksisite ve antitümör aktivitelerine rutin flavonoidinin etkileri
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Date
2015
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Sağlık Bilimleri Enstitüsü
Abstract
Rutin is a strong antioxidant molecule and it has advantageous over other flavonoids since it is a nontoxic and nonoxidizable molecule. The concept of dual therapy of anti-cancer drugs with natural compounds has become a very promising approach in new strategy to treatment. The aim of this study was to evaluate the antiproliferative, apoptotic and anti-inflammatory effects of rutin flavonoids and its efficacy in enhancing the anticancer effects of 5-FU (5-fluorouracil) and oxaliplatin against colon cancer cells. Caco-2 human colon adenocarcinoma cells were used. Caco-2 human colon cancer cells were treated with rutin and/or anticancer drugs (5-FU and oxaliplatin). Cell viability, apoptosis and inflammation parameters were examined. The antiproliferative effects of rutin in Caco-2 cells were detected by MTT assay. Apoptotic and inflammation markers were determined using specific enzyme-linked immunosorbent assay kits. Caspase-8 and caspase-9 were analyzed by colorimetric activity assay kit. DNA fragmentation was analyzed by agarose gel electrophoresis. The exposure of Caco-2 human colon cancer cells to rutin, 5-FU and oxaliplatin resulted growth inhibition in a dose- and time-dependent manner. Cell viability assay shows that rutin inhibiting growth of Caco-2 cells at high concentrations (over 1000 µM). Combination with rutin markedly enhanced 5-FU and oxaliplatin growth inhibiting effects on Caco-2 cells. Results suggested that rutin had significant anticancer abilities; such rutin were capable of causing multifold decreases in the half maximal inhibitory concentration IC50 value of 5-FU and oxaliplatin. This flavonoid increased the levels of proteins associated with apoptotic cell death (cleaved caspase 3 and cleaved PARP) alone and combination. The activities of caspase 8 and caspase 9 were stimulated by the combination treatment of rutin and oxaliplatin then alone. Rutin suppresses inflammation by inhibiting NfKB and COX-2 activities. DNA fragmentation was observed only on combination treatment. Combined treatment with rutin and anticancer drugs (5-FU and/or oxaliplatin) is more effective than the individual treatments of drugs at inhibiting growth of Caco-2 cells. The use of lower 5-FU and oxaliplatin doses, with similar effects, could be also useful to reduce possible adverse effects of these drugs.
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Keywords
Flavonoidler, Kolon neoplazmları, Neoplazmlar