Abstract：
:Hepsulfam (NSC 329680, 1,7-heptanediol disulfamate) is an alkylating agent that showed excellent activity against mouse and human mammary carcinoma in preclinical studies. We therefore studied the cytotoxicity of this drug in six human breast cancer cell lines (AdrRMCF7, WTMCF7, Hs578T, MDA-MB-231, T47D, and MDA-MB-468). Clonogenic assays of these cell lines showed a range of sensitivity with the 90% inhibitory concentration ranging from 3.1 microM hepsulfam (MDA-MB-468) to 32.3 microM hepsulfam (AdrRMCF7) after 24-h exposure to the drug. To evaluate possible mechanisms responsible for this observed variation in sensitivity to hepsulfam, we have studied glutathione S-transferase (GST) activity and glutathione (GSH) in these cell lines. Total cytoplasmic GST activity correlated with sensitivity; the most sensitive cell lines had the lowest GST activity, while the two most resistant cell lines, AdrRMCF7 and Hs578T, had the highest GST levels of the six cell lines. Western blot analysis showed that the only detectable isoenzyme was GST-pi. The amount of GST-pi isoform correlated with hepsulfam sensitivity in the three most resistant cell lines and was undetectable in the three most sensitive cell lines. Cellular concentrations of GSH did not correlate with hepsulfam sensitivity. However, GSH depletion with buthionine sulfoximine increased sensitivity to hepsulfam in a dose-dependent fashion in all six cell lines. Evaluation by mass spectrometry revealed that glutathione can form conjugates with hepsulfam. We conclude that the GST/GSH detoxication system plays a role in the sensitivity of these breast cancer cell lines to hepsulfam.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Armstrong DK,Gordon GB,Hilton J,Streeper RT,Colvin OM,Davidson NEsubject
Has Abstractpub_date
1992-03-15 00:00:00pages
1416-21issue
6eissn
0008-5472issn
1538-7445journal_volume
52pub_type
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