Document Detail

The role of oxidative stress in the toxicity of pyridoxal isonicotinoyl hydrazone (PIH) analogues.
MedLine Citation:
PMID:  12196187     Owner:  NLM     Status:  MEDLINE    
Pyridoxal isonicotinoyl hydrazone (PIH) analogues are effective iron chelators in vivo and in vitro, and may be of value for the treatment of secondary iron overload. The sensitivity of Jurkat cells to Fe-chelator complexes was enhanced several-fold by the depletion of the antioxidant glutathione, indicating the role of oxidative stress in their toxicity. K562 cells loaded with eicosapentaenoic acid, a fatty acid particularly susceptible to oxidation, were also more sensitive to the toxic effects of the Fe complexes, and toxicity was proportional to lipid peroxidation. Thus Fe-chelator complexes cause oxidative stress, which may be a major component of their toxicity. As was the case for their Fe complexes, the toxicity of PIH analogues was enhanced by glutathione depletion of Jurkat cells and eicosapentaenoic acid-loading of K562 cells. Thus the toxicity of the chelators themselves is also enhanced by compromised cellular redox status. In addition, the toxicity of the chelators was diminished by culturing Jurkat cells under hypoxic conditions, which may limit the production of the reactive oxygen species that initiate oxidative stress. A significant part of the toxicity of the chelators may be due to intracellular formation of Fe-chelator complexes, which oxidatively destroy the cell.
J L Buss; J Neuzil; P Ponka
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biochemical Society transactions     Volume:  30     ISSN:  0300-5127     ISO Abbreviation:  Biochem. Soc. Trans.     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-08-28     Completed Date:  2003-02-24     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7506897     Medline TA:  Biochem Soc Trans     Country:  England    
Other Details:
Languages:  eng     Pagination:  755-7     Citation Subset:  IM    
Lady Davis Institute for Medical Research, Sir Mortimer B. Davis Jewish General Hospital, 3755 chemin de la Cote-Ste-Catherine, Montreal, Quebec, Canada H3T 1E2.
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MeSH Terms
Ascorbic Acid
Cell Survival / drug effects
Chelating Agents / toxicity*
Drug Design
Iron Chelating Agents / toxicity
Isoniazid / analogs & derivatives*,  toxicity*
Jurkat Cells
K562 Cells
Molecular Structure
Oxidative Stress
Pyridoxal / analogs & derivatives*,  toxicity*
Structure-Activity Relationship
Reg. No./Substance:
0/Chelating Agents; 0/Iron Chelating Agents; 50-81-7/Ascorbic Acid; 54-85-3/Isoniazid; 66-72-8/Pyridoxal; 737-86-0/pyridoxal isonicotinoyl hydrazone

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