Glutathione depletion overcomes resistance to arsenic trioxide in arsenic-resistant cell lines.
Arsenic trioxide (As(2)O(3)) is an effective treatment for acute promyelocytic leukemia (APL), but is less effective against other leukemias. Although the response of APL cells to As(2)O(3) has been linked to degradation of the PML/RARalpha fusion oncoprotein, there is evidence that PML/RARalpha expression is not the only mediator of arsenic sensitivity. Indeed, we found that exogenous expression of PML/RARalpha did not sensitize a non-APL leukemic line to As(2)O(3). To evaluate possible other determinants of sensitivity of leukemic cells to As(2)O(3), we derived two arsenic-resistant NB4 subclones. Despite being approximately 10-fold more resistant to arsenic than their parental cell line, PML/RARalpha protein was still degraded by As(2)O(3) in these cells, providing further evidence that loss of expression of the oncoprotein does not confer arsenic sensitivity. Both arsenic-resistant clones contained high glutathione (GSH) levels, however, and we found that GSH depletion coupled with As(2)O(3) treatment dramatically inhibited their growth. Annexin V-staining and TUNEL analysis confirmed a synergistic induction of apoptosis. In addition, these cells failed to accumulate ROS in response to arsenic treatment, in contrast to their arsenic-sensitive parental cells, unless cotreated with buthionine sulfoximine. While other malignant cells did not show a good correlation between arsenic sensitivity and GSH content, GSH depletion nevertheless sensitized all cell lines examined, regardless of their initial response to arsenic alone. These findings suggest that PML/RARalpha expression is not a determinant of arsenic sensitivity, and further support the coupling of GSH depletion and arsenic treatment as a novel treatment for human malignancies that are unresponsive to arsenic alone.
Lady Davis Institute for Medical Research, Sir Mortimer B Davis Jewish General Hospital, McGill University, Montréal, Québec, Canada.
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Miller
D017304:Annexin A5 / Q000378:metabolism; D000964:Antimetabolites, Antineoplastic / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D017209:Apoptosis / Q000187:drug effects; D000077237:Arsenic Trioxide; D001152:Arsenicals / Q000627:therapeutic use*; D019328:Buthionine Sulfoximine / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D019008:Drug Resistance, Neoplasm; D024202:Electrophoretic Mobility Shift Assay; D005978:Glutathione / Q000172:deficiency* / Q000378:metabolism; D006801:Humans; D020287:In Situ Nick-End Labeling; D015473:Leukemia, Promyelocytic, Acute / Q000188:drug therapy* / Q000378:metabolism; D009363:Neoplasm Proteins / Q000378:metabolism; D015514:Oncogene Proteins, Fusion / Q000378:metabolism; D010087:Oxides / Q000627:therapeutic use*; D017382:Reactive Oxygen Species / Q000378:metabolism; D014407:Tumor Cells, Cultured
D017304:Annexin A5; D000964:Antimetabolites, Antineoplastic; D000970:Antineoplastic Agents; D001152:Arsenicals; D009363:Neoplasm Proteins; D015514:Oncogene Proteins, Fusion; D010087:Oxides; D017382:Reactive Oxygen Species; C093476:promyelocytic leukemia-retinoic acid receptor alpha fusion oncoprotein; D019328:Buthionine Sulfoximine; D005978:Glutathione; D000077237:Arsenic Trioxide