Hydrogen peroxide lethality is associated with a decreased ability to maintain positive DNA supercoiling.

Abstract:

:Hydrogen peroxide is more toxic to mammalian cells at 37 degrees C than 0 degree C at all concentrations studied. Histone-free nuclei (nucleoids) extracted from treated cells have a reduced ability to maintain positive DNA supercoiling, with the maximum effect at the higher temperature. Prior exposure of cells to sodium ascorbate at 0 degree C increased both toxicity and the inhibition of nuclear supercoil rewinding. After exposure at 0 degrees C, normal levels of supercoiling returned with both a fast and a slow component, kinetics characteristic of DNA single-strand break repair; the fast component was eliminated when cells were exposed at 37 degrees C due to in situ rejoining. At least a portion of the lethal lesions induced by hydrogen peroxide are DNA double-strand breaks (dsb) because the dsb repair-deficient mutant, xrs-5, is approximately two to three times more sensitive than wild-type cells over the initial portion of the survival curve. However, the increased toxicity found after exposure at 37 degrees C is observed equally in both cell lines, indicating that temperature-dependent cell killing is not directly linked to DNA dsb. It is suggested that cell killing at 37 degrees C is mediated through two linked processes. First, hydrogen peroxide may disrupt cation-stabilized nuclear supercoiling by direct ion oxidation. Second, as a part of the oxidation process, hydrogen peroxide will produce potentially cytotoxic free radicals close to the DNA-linked metal site, limited in extent only by the presence of chemicals capable of reducing metal ions prior to reoxidation.

journal_name

Exp Cell Res

authors

Vaughan AT,Gordon DJ

doi

10.1016/0014-4827(92)90088-p

keywords:

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

376-80

issue

2

eissn

0014-4827

issn

1090-2422

pii

0014-4827(92)90088-P

journal_volume

202

pub_type

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