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Simultaneous inhibition of glutathione- and thioredoxin-dependent metabolism is necessary to potentiate 17AAG-induced cancer cell killing via oxidative stress
- Source :
- Free Radical Biology and Medicine. 52:436-443
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- 17-Allylamino-17-demethoxygeldanamycin (17AAG) is an experimental chemotherapeutic agent believed to form free radicals in vivo, and cancer cell resistance to 17AAG is believed to be a thiol-dependent process. Inhibitors of thiol-dependent hydroperoxide metabolism [l-buthionine-S,R-sulfoximine (BSO) and auranofin] were combined with the glucose metabolism inhibitor 2-deoxy-d-glucose (2DG) to determine if 17AAG-mediated cancer cell killing could be enhanced. When 2DG (20 mM, 24 h), BSO (1 mM, 24 h), and auranofin (500 nM, 3 h) were combined with 17AAG, cell killing was significantly enhanced in three human cancer cell lines (PC-3, SUM159, MDA-MB-231). Furthermore, the toxicity of this drug combination was significantly greater in SUM159 human breast cancer cells, relative to HMEC normal human breast epithelial cells. Increases in toxicity seen with this drug combination also correlated with increased glutathione (GSH) and thioredoxin (Trx) oxidation and depletion. Furthermore, treatment with the thiol antioxidant NAC (15 mM, 24 h) was able to significantly protect from drug-induced toxicity and ameliorate GSH oxidation, Trx oxidation, and Trx depletion. These data strongly support the hypothesis that simultaneous inhibition of GSH- and Trx-dependent metabolism is necessary to sensitize human breast and prostate cancer cells to 2DG+17AAG-mediated killing via enhancement of thiol-dependent oxidative stress. These results suggest that simultaneous targeting of both GSH and Trx metabolism could represent an effective strategy for chemosensitization in human cancer cells.
- Subjects :
- Thioredoxin-Disulfide Reductase
Auranofin
Cell Survival
Glutamate-Cysteine Ligase
Lactams, Macrocyclic
Glutathione reductase
Antineoplastic Agents
Deoxyglucose
Biology
medicine.disease_cause
Biochemistry
Article
chemistry.chemical_compound
Thioredoxins
Cell Line, Tumor
Physiology (medical)
Benzoquinones
medicine
Humans
Buthionine sulfoximine
Buthionine Sulfoximine
Glutathione Disulfide
Drug Synergism
Glutathione
Oxidative Stress
Cell killing
chemistry
Cancer cell
Cancer research
Thioredoxin
Oxidation-Reduction
Oxidative stress
medicine.drug
Subjects
Details
- ISSN :
- 08915849
- Volume :
- 52
- Database :
- OpenAIRE
- Journal :
- Free Radical Biology and Medicine
- Accession number :
- edsair.doi.dedup.....83f0f5e8446569988663709a8c3d4177