Summary
The effect of a combined treatment with shock waves generated by a lithotripter and Adriamycin or cisplatin was examined in cells that acutely survived exposure to shock waves and proliferated afterwards. Batches of 2 x 106 cells were exposed to the respective drug for 50 min or for 50 min plus 72 h. During the 50-min drug exposure 500 shock waves were applied at 25 kV. The growth as a percentage of the control was determined after 72 h by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Cells treated with shock waves alone showed a growth inhibition as compared to control cells. For a 50-min drug exposure with Adriamycin the dose enhancement ratio did not exceed 1.3. For a 50-min drug exposure with cisplatin at concentrations of 0.5 μg/ml and 5.0 μg/ml, growth (as a percentage of the control) after combined treatment was significantly reduced as compared to cisplatin treatment alone; the dose enhancement ratio was 3.2 at 50% growth compared to the control. This indicates that shock waves can increase the susceptibility of L1210 cells to cisplatin. For a 50-min plus 72-h drug exposure no effect of an additional treatment with shock waves, as compared to chemotherapy alone, could be observed.
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Abbreviations
- DER:
-
dose-enhancement ratio
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide
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Wilmer, A., Gambihler, S., Delius, M. et al. In vitro cytotoxic activity of lithotripter shock waves combined with Adriamycin or with cisplatin on L1210 mouse leukemia cells. J Cancer Res Clin Oncol 115, 229–234 (1989). https://doi.org/10.1007/BF00391694
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DOI: https://doi.org/10.1007/BF00391694