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Effects of terbium on the cytotoxicity of cisplatin in FaDu human head and neck squamous cell carcinoma.

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In this investigation, we report a relationship between the terbium (Tb3+) binding protein and the cytotoxicity of cisplatin in human head and neck cancer cells. In the FaDu cell line, the cytotoxic action of cisplatin was shown to be approximately six times more potent than the cytotoxicity of Tb3+. When cisplatin was combined with 80 microM Tb3+, the IC20 and IC50 values for cisplatin were reduced by 70% and 24%, respectively. The IC80 value, however, was increased by 124%. The results suggest that the cytotoxicity of cisplatin is enhanced by Tb3+ at low cisplatin concentrations. In agreement with previous studies, calcium and cisplatin were found to be mixed-type and noncompetitive inhibitors, respectively, of the Tb3+ -FaDu intensity. These findings imply that the receptor binding of Tb3+ can modulate the cytotoxic activity of cisplatin.

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