Hydrogen peroxide induces DNA single strand breaks in respiratory epithelial cells.

Abstract:

:The respiratory epithelium is often exposed to oxidant gases, including ozone from photochemical smog and toxic oxygen metabolites released from neutrophils recruited in conditions of airway inflammation. We evaluated DNA single strand break formation by alkaline elution as a measure of oxidant-induced DNA damage to bronchial epithelial cells. Human AdenoSV-40-transformed bronchial epithelial cells (BEAS), subclone R1.4 or nonhuman primate bronchial epithelial cells were cultured in growth factor supplemented Ham's F12 medium on polycarbonate filters. DNA was labeled by incubation with [3H]thymidine. Cells were incubated for 1 h in HBSS or HBSS and increasing concentrations of hydrogen peroxide (H2O2). Cells incubated in H2O2 demonstrated dose-dependent increases in strand break formation, and BEAS cells were more sensitive to H2O2-induced injury than primary bronchial epithelial cells. The addition of catalase or preincubation of cells with the iron chelator desferoxamine prevented H2O2-induced strand breakage. DNA strand break formation may be an important mechanism of oxidant injury in respiratory epithelial cells.

journal_name

Inflammation

journal_title

Inflammation

authors

McDonald RJ,Pan LC,St George JA,Hyde DM,Ducore JM

doi

10.1007/BF00920476

subject

Has Abstract

pub_date

1993-12-01 00:00:00

pages

715-22

issue

6

eissn

0360-3997

issn

1573-2576

journal_volume

17

pub_type

杂志文章