Abstract
We established a vindesine-resistant (x 11.6) human small-cell lung cancer cell line (H69/VDS) by stepwise exposure of parent line H69 to vindesine. H69/VDS showed cross-resistance to taxol (x 10.1), vincristine (x 6.9) and colchicine (x 3.4) but not to doxorubicin, cisplatin or etoposide. There was no significant difference in intracellular [3H]-vincristine and doxorubicin accumulation between H69 and H69/VDS cells. The human mdr1 mRNA was not detected in either of the cell lines. These results indicated that H69/VDS did not express a typical multidrug resistant phenotype. Addition of 20 microM verapamil enhanced the growth inhibitory effect of vindesine on both H69/VDS (x 12.0) and H69 cells (x 3.8). The amount of total tubulin in H69/VDS cells was lower than that in the H69 parental cells. No significant increase was observed in the amount of total and polymerised tubulins of H69 cells. In H69/VDS cells, however, verapamil increased the amount of total tubulin to the level of parental cells, but decreased the amount of polymerised tubulin. Modulation of tubulin may play a role in the resistance to vindesine.
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Ohta, S., Nishio, K., Kubo, S. et al. Characterisation of a vindesine-resistant human small-cell lung cancer cell line. Br J Cancer 68, 74–79 (1993). https://doi.org/10.1038/bjc.1993.289
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DOI: https://doi.org/10.1038/bjc.1993.289
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