Document Detail

Combined effects of okadaic acid and cadmium on lipid peroxidation and DNA bases modifications (m5dC and 8-(OH)-dG) in Caco-2 cells.
MedLine Citation:
PMID:  10839474     Owner:  NLM     Status:  MEDLINE    
Okadaic acid (OA) is a marine toxin, a tumour promoter and an inducer of apoptosis. It mainly inhibits protein-phosphatases, protein synthesis and enhances lipid peroxidation. Cadmium (Cd) is known to be carcinogenic in animals and humans (group 1 according to the International Agency for Research on Cancer (IARC) classification). Cd also induces oxidative stress in living organisms. Since they are sometimes found simultaneously in mussels, we have evaluated in the present investigation, the lipid peroxidation, as malondialdehyde (MDA) production, in the variation of the ratios of 8-(OH)-dG/10(5)dG and m5dC/(dC + m5dC) induced by OA and/or Cd in Caco-2 cells. When cells were treated exclusively by OA (15 ng/ml) or Cd (0.625 and 5 microg/ml) for 24 h, protein synthesis was inhibited (by 42 +/- 5%, 18 +/- 13%, and 90 +/- 4% respectively) while MDA production was 2,235 +/- 129, 1710 +/- 20, and 11,496 +/-1,624 pmol/mg protein respectively. In addition, each toxicant induced modified bases in DNA; increases in oxidised bases and methylated dC. The combination of OA and cadmium was more cytotoxic and caused more DNA base modifications; the ratio m(5)dC/(m(5)dC + dC) was increased from 3 +/- 0.15 to 9 +/- 0.15 and the ratio 8-(OH)-dG/10(5) dG also (from 36 +/- 2 to 76 +/- 6). The combination of OA and Cd also increased the level of MDA (1,6874 +/- 2,189 pmole/mg protein). The present results strongly suggest that DNA damage resulting from the oxidative stress induced by these two toxicants may significantly contribute to increasing their carcinogenicity via epigenetic processes.
A Traoré; S Ruiz; I Baudrimont; A Sanni; S D Dano; P Guarigues; J F Narbonne; E E Creppy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of toxicology     Volume:  74     ISSN:  0340-5761     ISO Abbreviation:  Arch. Toxicol.     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-08-17     Completed Date:  2000-08-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417615     Medline TA:  Arch Toxicol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  79-84     Citation Subset:  IM    
Department of Toxicology, University Victor Segalen Bordeaux 2, France.
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MeSH Terms
5-Methylcytosine / analogs & derivatives
Caco-2 Cells / drug effects,  metabolism
Cadmium / toxicity*
Carcinogens / toxicity*
Chromatography, High Pressure Liquid
Cytosine / analogs & derivatives,  metabolism
DNA / drug effects*,  metabolism
Deoxyguanosine / analogs & derivatives,  metabolism
Drug Synergism
Enzyme Inhibitors / toxicity*
Leucine / metabolism
Lipid Peroxidation / drug effects*
Malondialdehyde / metabolism
Okadaic Acid / toxicity*
Protein Synthesis Inhibitors / toxicity
Reg. No./Substance:
0/5-methyldeoxycytosine; 0/8-hydroxy-2'-deoxyguanosine; 0/Carcinogens; 0/Enzyme Inhibitors; 0/Protein Synthesis Inhibitors; 542-78-9/Malondialdehyde; 554-01-8/5-Methylcytosine; 61-90-5/Leucine; 71-30-7/Cytosine; 7440-43-9/Cadmium; 78111-17-8/Okadaic Acid; 9007-49-2/DNA; 961-07-9/Deoxyguanosine

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