Abstract
Abstract Background Multidrug resistance (MDR) to known chemotherapeutic agents is increasing while the development of new drugs is lacking behind. Combination therapies might increase the development of effective treatment. Anticancer properties of C. sativa L. have been extensively studied against various cancer cell lines but research on its effectiveness on MDR in cancer is less documented. Aim To determine the potential resistant reversal of the cytostatic drug doxorubicin by C. sativa L. extracts through combination studies. Method The cytotoxic effect of the different C. sativa L. extracts was assessed against a panel of human colon cancer cells (HT-29, Caco-2, HCT-15, LS513) and normal colon cells (CCD-18Co) by MTT assay. Drug-extract combination studies were performed on HCT-15 and LS513 MDR cells. Results DCM: methanol- and H2O extracts moderately inhibited the growth in HCT-15 and LS513 cells (IC50: 20–100 μg/ml). DCM- and H2O extracts potently inhibited HT-29 cell growth. Higher concentrations (100 μg/ml) of the hexane- and DCM- extracts slightly stimulated growth in Caco-2 cells. All the C. sativa L. extracts were more cytotoxic towards the cancerous cells than towards the normal colon cells. Combination studies between doxorubicin and the C. sativa L. extracts revealed synergistic growth inhibitory effects (CI Conclusion C. sativa L. extracts possess direct selective cytotoxic effect on colon cells and have a potential to reverse doxorubicin resistance.
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