The mechanism by which tumour cells may be killed in vitro by exogenous polyunsaturated fatty acids may involve lipid peroxidation. Gamma-linolenic acid caused a dose and time-dependent reduction in ZR-75-1 cell growth. However, altering either the incubator temperature (35, 37 and 39 degrees C) or the oxygen content (16, 21 and 26%) had little effect on either the growth of cells in the presence of gamma-linolenic acid or on thiobarbiturate reactive material levels over a 7 day period. Thus, small changes in cell culture conditions do not affect 18:3n-6 cytotoxicity or markers of lipid peroxidation.
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