Modulation of oxidant stress in vivo in chronic cigarette smokers

Circulation
M P ReillyG A Fitzgerald

Abstract

Free radical-induced oxidative damage is thought to be involved in the pathogenesis of diseases associated with cigarette smoking. We examined the production of 8-epi-prostaglandin (PG) F2 alpha, a stable product of lipid peroxidation in vivo, and its modulation by aspirin and antioxidant vitamins in chronic cigarette smokers. We performed the following studies: (1) a cross-sectional comparison of smokers and control subjects, (2) an examination of the dose-response relationship, (3) an exploration of the effect of smoking cessation (3 weeks) and nicotine patch supplementation, (4) the effect of aspirin consumption, and (5) the effects of 5 days' dosing with vitamin E (100 and 800 U), vitamin C (2 g), and their combination. 8-epi-PGF2 alpha excretion (in pmol/mmol, mean +/- SEM) was 176.5+/-30.6 in heavy smokers, 92.7+/-4.8 (P<.05) in moderate smokers, and 54.1+/-2.7 (P<.005) in nonsmokers. Urinary levels fell from 145.5+/-24.9 to 114.6+/-27.1 (week 2, P<.05) and 112.6+/-24.9 (week 3, P<.05) on cessation of smoking. Aspirin treatment failed to suppress urinary levels of 8-epi-PGF2 alpha despite a significant reduction in urinary 11-dehydro-TxB2 production and suppression of 8-epi-PGF2 alpha and TxB2 in serum. Vitamin C (pre, 19...Continue Reading

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