Document Detail

Cytotoxicity of arsenic trioxide is enhanced by (-)-epigallocatechin-3-gallate via suppression of ferritin in cancer cells.
MedLine Citation:
PMID:  20950636     Owner:  NLM     Status:  In-Process    
Arsenic trioxide (ATO) treatment is a useful therapy against human acute promyelocytic leukemia (APL), however, it concomitantly brings potential adverse consequences including serious side effect, human carcinogenicity and possible development of resistance. This investigation revealed that those problems might be relaxed by simultaneous application with (-)-epigallocatechin-3-gallate (EGCG), one of the major components from green tea. EGCG significantly lowered down the ATO concentration required for an effective control of APL cells, HL-60. The simultaneous treatment of ATO with EGCG induced a mitochondria-dependent apoptosis in HL-60 cells significantly, which accounted for more than 70% of the cell death in the treatment. The mechanism of apoptosis induction was elucidated. EGCG in HL-60 cells acted as a pro-oxidant enhancing intracellular hydrogen peroxide significantly. ATO, on the other hand, induced heme oxygenase-1 (HO-1) to catalyze heme degradation, thereby provided ferrous iron for EGCG-induced hydrogen peroxide to precede Fenton reaction, which in turn generated deleterious reactive oxygen species to damage cell. In addition, EGCG inhibited expression of ferritin, which supposedly to sequester harmful ferrous iron, thereby augmented the occurrence of Fenton reaction. This investigation also provided evidence that ATO, since mainly acted to induce HO-1 in simultaneous treatment with EGCG, could be replaced by other HO-1 inducer with much less human toxicity. Furthermore, several of our preliminary investigations revealed that the enhanced cytotoxicity induced by combining heme degradation and Fenton reaction is selectively toxic to malignant but not non-malignant cells.
Te-Chang Lee; I-Cheng Cheng; Jun-Jie Shue; T C Wang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-13
Journal Detail:
Title:  Toxicology and applied pharmacology     Volume:  250     ISSN:  1096-0333     ISO Abbreviation:  Toxicol. Appl. Pharmacol.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0416575     Medline TA:  Toxicol Appl Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  69-77     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Institute of Biomedical Sciences, Academia Sinica, Taiwan.
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