PMID: 9554837Apr 29, 1998Paper

In vivo dual effects of vitamin C on paraquat-induced lung damage: dependence on released metals from the damaged tissue

Free Radical Research
S A KangH Park

Abstract

Vitamin C, a potent antioxidant, can act as a pro-oxidant in the presence of free transition metal ions by accelerating the Fenton reaction. An in vivo pro-oxidant role of vitamin C has been suggested, but direct evidence for it is scant. Here, we report the dual role of vitamin C on paraquat-induced lung injury, which appears to depend on the metal ions released from damaged cells. Vitamin C (10 mg/kg) given at the time when the extensive tissue damage was in progress aggravated the oxidative damage, while it protected against the damage when given before the initiation of the damage. The extent of oxidative tissue damage was monitored by measuring the expiratory ethane, one of the hydrocarbons produced during lipid peroxidation. Deferoxamine, given intraperitoneally as a bolus dose of 50 mg/kg, completely blocked the aggravation of oxidative damage by vitamin C. Moreover, deferoxamine unmasked the antioxidant effect of vitamin C. The results show that vitamin C can either aggravate or alleviate the oxidative tissue damage depending on the presence of metal ions released from damaged cells.

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Citations

May 15, 2002·Archives of Pharmacal Research·Hyun Dong JeUy Dong Sohn
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