Influence of cell cycle on glutathione-S-transferase, selenium-dependent glutathione peroxidase, superoxide dismutase and glutathione levels in human myeloid leukaemia cell lines.
An important biological function of glutathione (GSH) resides in the detoxication reactions mediated by enzymes such as glutathione-S-transferase (GSTs) and glutathione peroxidase (GPX). An increasing body of evidence implies that GSH and these enzymes play important roles in determining the sensitivity of tumours against cytotoxic drugs like quinone antibiotics, in particular adriamycin (Adr). In the present study, we have analysed the effects of cell-cycle on GSH and GSH-dependent enzymes in an attempt to explain cell-cycle specificity of these antileukaemic drugs which were shown to be involved in free-radical-type reactions. Determination of GSH, GST, GPX and superoxide dismutase in cell-cycle-enriched fractions of five different human myeloid leukaemia cell lines (KG1, K562, U937, ML-1 and ML-2) yielded results identical to those obtained in random cultures, which implies that neither GSH nor GSH-related enzymes are cell-cycle regulated. These findings argue against the presumption that cell-cycle specificity of cytotoxic drugs like Adr could be due to the glutathione-dependent metabolism in myeloid leukaemia cell lines.
Department of Medical Chemistry, University of Vienna, Austria.
T
T
Tihan
P
P
Chiba
R
R
Eher
R
R
Goebl
T
T
Pernerstorfer
M
M
Kraupp
E
E
Kaiser
D002453:Cell Cycle; D002460:Cell Line; D005434:Flow Cytometry; D005978:Glutathione / Q000378:metabolism*; D005979:Glutathione Peroxidase / Q000378:metabolism*; D005982:Glutathione Transferase / Q000378:metabolism*; D006801:Humans; D007951:Leukemia, Myeloid / Q000201:enzymology*; D012643:Selenium / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism*; D014407:Tumor Cells, Cultured
D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase; D005978:Glutathione; D012643:Selenium