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Proc Natl Acad Sci U S A. Mar 29, 1994; 91(7): 2607–2610.
PMCID: PMC43418

Heme oxygenase 1 mediates an adaptive response to oxidative stress in human skin fibroblasts.

Abstract

Oxidative stress of human skin fibroblasts by treatment with ultraviolet A (UVA) radiation has been shown to lead to an increase in levels of the heme catabolizing enzyme heme oxygenase 1 [heme, hydrogen-donor:oxygen oxidoreductase (alpha-methene-oxidizing, hydroxylating), EC 1.14.99.3] and the iron storage protein ferritin. Here we show that human skin fibroblasts, preirradiated with UVA, sustain less membrane damage during a subsequent exposure to UVA radiation than cells that had not been preirradiated. Pretreating cells with heme oxygenase 1 antisense oligonucleotide inhibited the irradiation-dependent induction of both the heme oxygenase I enzyme and ferritin and abolished the protective effect of preirradiation. Inhibition of the UVA preirradiation-dependent increase in ferritin, but not heme oxygenase, with desferrioxamine also abolished the protection. This identifies heme oxygenase 1 as a crucial enzymatic intermediate in an oxidant stress-inducible antioxidant defense mechanism, involving ferritin, in human skin fibroblasts.

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