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American Journal of Clinical Nutrition, Vol 62, 1490S-1500S, Copyright © 1995 by The American Society for Clinical Nutrition, Inc
ORIGINAL RESEARCH COMMUNICATIONS |
JP Eiserich, A van der Vliet, GJ Handelman, B Halliwell and CE Cross
Division of Pulmonary/Critical Care Medicine, University of California, Davis, USA.
Epidemiologic evidence suggests that cigarette smoking is a major risk factor for chronic obstructive pulmonary diseases such as chronic bronchitis and emphysema, for carcinogenesis, and for cardiovascular disease. However, the precise mechanisms of these effects are incompletely understood. The gas phase of cigarette smoke contains abundant free radicals including nitric oxide. Hence, cigarette smoke may induce some of its damaging effects by free radical mechanisms. We report that exposure of plasma, a model for respiratory tract lining fluids, to gas-phase cigarette smoke causes depletion of antioxidants, including ascorbate, urate, ubiquinol-10, and alpha-tocopherol, and a variety of carotenoids, including beta-carotene. Gas-phase cigarette smoke induced some lipid peroxidation, as measured by cholesteryl linoleate hydroperoxide (18:2OOH) formation. Ascorbate was effective in preventing 18:2OOH formation. In contrast to the low concentrations of lipid hydroperoxides measured (< 1 mumol/L), protein carbonyl formation, a measure of protein modification, increased by approximately 400 mumol/L after nine puffs of cigarette smoke. Reduced glutathione inhibited protein carbonyl formation, whereas other plasma antioxidants, including ascorbate, were ineffective. alpha, beta- Unsaturated aldehydes (acrolein and crotonaldehyde) in cigarette smoke may react with protein -SH and -NH2 groups by a Michael addition reaction that results in a protein-bound aldehyde functional group. Gas- phase cigarette smoke is capable of converting tyrosine to 3- nitrotyrosine and dityrosine, indicating free radical mechanisms of protein damage by nitrogen oxides. Aldehydes and nitrogen oxides in cigarette smoke may be significant contributors to biomolecular damage, and endogenous antioxidants can attenuate some of these adverse effects.
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