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Lipid peroxidation in human breast cancer (ZR-75-1) cells and cancer cell killing were confirmed by using ultraviolet (UV)-spectrophotometry and mass spectrometry (MS). ZR-75-1 cells and human normal fibroblast CCD-41-SK (41Sk) cells were cultured with gamma-linolenic acid (GLA) and ferrous iron Fe (II) combinations. Formation of lipid peroxide and cytotoxic effect were highest in ZR-75-1 cells treated with GLA + Fe (II), though 41Sk cells showed little evidence of either lipid peroxidation or cytotoxity. These results indicate a cancer-cell-specific lipid peroxidation mechanism in association with the selective cancer cell killing effect in response to GLA.
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