Summary
The synthetic ether lipids ET-18-OCH3 and BM41.440 and a derivative, hexadecylphosphocholine, were tested for inhibition of [3H]-thymidine uptake into a Chinese hamster ovarian cell line (AUXB1) and its multidrug-resistant subline selected for colchicine resistance (CHRC5). The activity of all three compounds against the multidrug-resistant subline was equal to or higher than that against the parent line. The same result was found for their activity against a human leukemic lymphoblastic cell line (CEM/O) and its methotrexate-resistant subline (CEM/MTX). In contrast, two multidrug-resistant cell lines selected for resistance to Adriamycin, the mouse leukemia cell line P388/ADR and the murine sarcoma cell line S180/ADR, expressed modest cross-resistance to the lipids as measured by thymidine uptake. Experiments performed using the trypan-blue dye-exclusion assay yielded comparable results, although this system revealed a slightly different sensitivity in showing the cytotoxicity of the drugs. By this assay, modest cross-resistance for ET-18-OCH3 and BM41.440 to Adriamycin was found only after 24 h incubation and decreased after 48 h incubation, with almost equal sensitivity to both drugs being shown by the parental (P388/W) and resistant lines (P388/ADR). Furthermore, findings from a human tumor-cloning assay were in accordance with these data, although they did not indicate cross-resistance for the P388/ADR cell line. These results suggest that certain ether lipids and derivatives might represent valuable anticancer drugs warranting further study in the setting of resistant disease.
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Abbreviations
- ALP :
-
alkyl-lysophospholipid derivative(s)
- TLP :
-
thioether-lysophospholipid derivative(s)
- EL :
-
ether lipid(s)
- ET-18-OCH 3 :
-
1-O-octadecyl-2-O-methyl-rac-glycero-3-phosphocholine
- BM41.440 :
-
1-hexadecylmercapto-2-methoxymethyl-rac-glycero-3-phosphocholine
- MDR :
-
multiple drug resistance
- MTX :
-
methotrexate
- DHFR :
-
dihydrofolate reductase
- ADR :
-
Adriamycin
- FCS :
-
fetal calf serum
- HTCA :
-
human tumor-cloning assay
- IC 50 :
-
drug concentration inhibiting the 48 h [3H]-thymidine uptake of cells by 50% or resulting in a 50% decrease in trypan-blue dye exclusion or colony formation in the HTCA at the times indicated
- RDR :
-
relative drug resistance
- HPC :
-
hexadecylphosphocholine (D18 506)
- PK-C :
-
protein kinase C
- TPA :
-
12-O-tetradecanoylphorbol-13-acetate
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This work was supported by Deutsche Forschungsgemeinschaft grant DFG BE 822/2-6, by a Heisenberg scholarship sponsored by the Deutsche Forschungsgemeinschaft (W. E. B.), and by grants CA-29 850 (W. R. V.) and CA-41314 (E.J.M.) from the National Cancer Institute
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Himmelmann, A.W., Danhauser-Riedl, S., Steinhauser, G. et al. Cross-resistance pattern of cell lines selected for resistance towards different cytotoxic drugs to membrane-toxic phospholipids in vitro. Cancer Chemother Pharmacol 26, 437–443 (1990). https://doi.org/10.1007/BF02994095
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DOI: https://doi.org/10.1007/BF02994095