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Growth of cells in vitro in the presence of fatty acids can alter the membrane composition and hence fluidity and permeability. Exposure of both doxorubicin (2780AD) and cisplatin (2780CP) resistant human ovarian cell lines to non-toxic concentrations of polyunsaturated fatty acids (gamma-linolenic acid and eicosapentaenoic acid) either before or during exposure to the cytotoxic drug did not modulate drug sensitivity. However, the fatty acids were toxic in their own right. Whilst the ovarian cell lines 2780AD and 2780CP showed a small degree of cross resistance to both fatty acids the doxorubicin resistant breast cell line MCF7/Adr was slightly more sensitive than MCF7. When the interactions between the polyunsaturated fatty acids and cytotoxic drugs were analysed by the isobologram method the toxicities were shown to be additive. The combination of polyunsaturated fatty acids and cytotoxic drugs may have clinical potential provided that the normal tissue toxicities of the two treatments are not additive.

Effect of polyunsaturated fatty acids on the drug sensitivity of human tumour cell lines resistant to either cisplatin or doxorubicin