Modulation by d,l-buthionine-S,R-sulphoximine of etoposide cytotoxicity on human non-small cell lung, ovarian and breast carcinoma cell lines

D. R A Mans, G. J. Schuurhuis, M. Treskes, M. V M Lafleur, J. Retèl, H. M. Pinedo, J. Lankelma

Research output: Contribution to journalArticle

Abstract

Treatment with 25 μmol/l d,l-buthionine-S,R-sulphoximine (BSO) for at least 24 h depleted glutathione (GSH) in human non-small cell lung (SW-1573), ovarian (A2780) and breast carcinoma (MCF-7) cell lines to about 20% of control, and was accompanied by a 2-fold potentiation of the cytotoxicity of etoposide, doxorubicin and cisplatin. Cellular etoposide, but not doxorubicin or cisplatin, concentrations were increased 2-fold due to decreased efflux. This occurred independently of the presence of BSO during 1 h of etoposide exposure, but required prolonged exposure to BSO (at least 24 h). Energy depletion as well as cotreatment, but not pretreatment, of the cells with daunomycin, doxorubicin, vinblastine or vincristine increased cellular etoposide accumulation. Treatment of control cells with verapamil caused similar changes in etoposide cytotoxicity and cellular pharmacokinetics as GSH depletion, but did not further increase etoposide cytotoxicity and accumulation in GSH-depleted cells. Etoposide efflux may have been inhibited, not because of (competitive) inhibition by BSO or disturbance of the energy required for this process, but probably because of plasma membrane alterations.

Original languageEnglish (US)
Pages (from-to)1447-1452
Number of pages6
JournalEuropean Journal of Cancer
Volume28
Issue number8-9
DOIs
StatePublished - 1992
Externally publishedYes

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ASJC Scopus subject areas

  • Cancer Research
  • Hematology
  • Oncology

Cite this

Mans, D. R. A., Schuurhuis, G. J., Treskes, M., Lafleur, M. V. M., Retèl, J., Pinedo, H. M., & Lankelma, J. (1992). Modulation by d,l-buthionine-S,R-sulphoximine of etoposide cytotoxicity on human non-small cell lung, ovarian and breast carcinoma cell lines. European Journal of Cancer, 28(8-9), 1447-1452. https://doi.org/10.1016/0959-8049(92)90541-9