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• W2182655233 startingPage "1109" @default.
• W2182655233 abstract "Abstract Docosahexaenoic acid (DHA, 22:6 n-3), a polyunsaturated fatty acid found in fish oil, exerts cytotoxic effects on cancer cells. Although DHA was toxic toward five human cancer cell lines (MCF-7, MDA-MB-231, SiHa, Raji, and DHL-4), the lines were not uniformly sensitive. DHL-4, a bcl-2 overexpressing lymphoid line, was the most sensitive (IC50, 5.2 μmol/L) and the cervical cancer cell line, SiHa, was the most resistant (IC50, &gt;300 μmol/L). Lipid peroxidation has been cited by others as an important component of DHA toxicity, and we confirmed that vitamin E prevents the cytotoxic effects of DHA. Lipid peroxidation was greater following DHA treatment of the sensitive DHL-4 cells than in the resistant SiHa cells, as assessed by thiobarbituric acid reactive substance generation. DHL-4 cells treated with DHA for 20 hours showed a 3.5-fold increase in thiobarbituric acid reactive substances, whereas SiHa cells showed no increase. Reverse transcription-PCR analysis detected a down-regulation of the expression of the major antioxidant enzyme, superoxide dismutase (SOD) 1, in DHL-4 cells but not in SiHa cells after DHA treatment. Knockdown of SOD1 expression in SiHa cells with small interfering RNA significantly enhanced lipid peroxidation and cytotoxicity on exposure to DHA. These results show that DHL-4 cells are highly sensitive to the cytotoxic effect of DHA and that regulation of SOD1 expression may play an important role in determining the sensitivity of different tumor cells to the cytotoxic effects of DHA." @default.
• W2182655233 created "2016-06-24" @default.
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• W2182655233 date "2004-09-01" @default.
• W2182655233 modified "2023-10-06" @default.
• W2182655233 title "Differential sensitivity of cancer cells to docosahexaenoic acid–induced cytotoxicity: The potential importance of down-regulation of superoxide dismutase 1 expression" @default.
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• W2182655233 doi "https://doi.org/10.1158/1535-7163.1109.3.9" @default.
• W2182655233 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15367705" @default.
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