Abstract
From a wild type strain of Ehrlich ascites tumor (EATWT) sublines resistant to daunorubicin (EATDNM), etoposide (EATETO), and cisplatinum (EATCIS) have been developed in vivo. Increase in survival and cure rate caused by adriamycin (doxorubicin) have been determined in female NMRI mice which were inoculated i. p. with EAT cells. Adriamycin concentrations causing 50% inhibition of 3H-thymidine (ICT) and 3H-uridine incorporation (ICU) and intracellular adriamycin steady-state concentrations (SSC) were measured in vitro. Adriamycin resistance increased and SSC decreased in the following sequence: EATWT — EATCIS — EATDNM — EATETO. When ICT and ICU were corrected for intracellular adriamycin concentrations in consideration of the different SSC (ICTC, ICUC), ICTC and ICUC still varied up to the 3.2 fold in EATCIS, EATDAM and EATETO in comparison to EATWT. Thus, in addition to different SSC other factors must be responsible for adriamycin resistance. Therefore, enzymes which may play a role in the cytotoxicity related to adriamycin metabolism (NADPH-cytochrome P-450 reductase, NADPH-glutathione reductase, NADP-glucose-6-phosphate dehydrogenase, NADP-isocitrate dehydrogenase) were measured. In contrast to the other parameters determined, NADPH-glutathione reductase was significantly (p<0.01) increased up to the 3.2 fold parallel to adriamycin resistance as determined by increase in life span, cure rate, ICTC, and ICUC, respectively. It is concluded that high activities of NADPH-glutathione reductase may contribute to an increase in adriamycin resistance of malignant tumors.
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Dedicated to Professor Dr. med. Herbert Remmer on the occasion of his 65th birthday
Supported by Deutsche Forschungsgemeinschaft, Bonn-Bad Godesberg, FRG: Sonderforschungsbereich 102, and Landesamt für Forschung Nordrhein-Westfalen, Düsseldorf, FRG
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Scheulen, M.E., Hoensch, H., Kappus, H. et al. Positive correlation between decreased cellular uptake, NADPH-glutathione reductase activity and adriamycin resistance in Ehrlich ascites tumor lines. Arch Toxicol 60, 154–157 (1987). https://doi.org/10.1007/BF00296970
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DOI: https://doi.org/10.1007/BF00296970