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Reaction of chromium (VI) with hydrogen peroxide in the presence of glutathione: reactive intermediates and resulting DNA damage.

Abstract：

:The reaction of chromium(VI) with hydrogen peroxide was studied in the presence of glutathione. In vitro, reaction of chromium(VI) with hydrogen peroxide alone led to production of hydroxyl radical as the significant reactive intermediate, while reaction of chromium(VI) with glutathione led to formation of two chromium(V)-glutathione complexes and the glutathione thiyl radical. Incubation of chromium(VI) with glutathione prior to addition of hydrogen peroxide led to formation of peroxochromium(V) species and a dramatic increase in hydroxyl radical production over that detected in the reaction of chromium(VI) with hydrogen peroxide alone. In contrast, addition of chromium(VI) to a preincubated mixture of glutathione and hydrogen peroxide led to a decrease in hydroxyl radical production over that obtained in the reaction of chromium(VI) with hydrogen peroxide. When pBR322 DNA was added to the above reactions, the extent of chromium(VI)-induced DNA strand breakage correlated with the relative amount of hydroxyl radical formed. Reaction of chromium(VI) with calf thymus DNA in the presence of a preincubated mixture of glutathione and hydrogen peroxide led to detection of the 8-hydroxydeoxyguanosine adduct, whose formation correlated with that of hydroxyl radical production. No significant chromium-DNA adduct formation was detected. The results suggest that, in the cellular metabolism of chromium(VI), preformed chromium(V)-glutathione complexes may react with hydrogen peroxide in a Fenton-type manner to produce hydroxyl radical as the DNA-damaging agent. However, if glutathione reacts with hydrogen peroxide prior to exposure to chromium(VI), the amount of hydroxyl radical generated may not be sufficient to cause significant DNA damage.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Chem Res Toxicol

journal_title

Chemical research in toxicology

authors

Aiyar J,Berkovits HJ,Floyd RA,Wetterhahn KE

doi

10.1021/tx00018a016

subject

Has Abstract

pub_date

1990-11-01 00:00:00

pages

595-603

issue

eissn

0893-228X

issn

1520-5010

journal_volume

pub_type

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Reaction of chromium (VI) with hydrogen peroxide in the presence of glutathione: reactive intermediates and resulting DNA damage.