Sensitization of cancer cells treated with cytotoxic drugs to fas-mediated cytotoxicity

Journal of the National Cancer Institute
O MicheauM T Dimanche-Boitrel

Abstract

The transmembrane receptor Fas, together with its protein-binding partner (Fas ligand), is a key regulator of programmed cell death (i.e., apoptosis). Fas and Fas ligand also influence the ability of cytotoxic T lymphocytes and natural killer cells to eliminate tumor cells. However, by inducing apoptosis in activated T cells, the Fas/Fas ligand system may protect some tumor cells from clearance by the immune system. Anticancer drugs enhance Fas ligand expression on the surface of Fas receptor-expressing leukemia cells, thus suggesting that apoptosis caused by these drugs may be mediated via the Fas/Fas ligand system. This study was conducted to further investigate the relationship between the modulation of Fas receptor gene and protein expression by treatment of cells with cytotoxic drugs and the immune clearance of tumor cells. Fas expression on human HT29 colon carcinoma cells treated with a variety of anticancer drugs (cisplatin, doxorubicin, mitomycin C, fluorouracil, and camptothecin) was analyzed by use of quantitative flow cytometry. Human HCT8R and HCT116 colon carcinoma cells and human U937 leukemia cells were treated with cisplatin only and analyzed in the same way. Fas ligand messenger RNA and protein levels were stu...Continue Reading

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