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Quantitative analysis of phospholipid peroxidation and antioxidant protection in live human epidermal keratinocytes.
Shvedova AA; Tyurina YY; Tyurin VA; Kikuchi Y; Kagan VE; Quinn PJ
Biosci Rep 2001 Feb; 21(1):33-43
To characterize oxidative stress in phospholipids of normal human epidermal keratinocytes we metabolically labeled their membrane phospholipids with a natural oxidation-sensitive fluorescent fatty acid, cis-parinaric acid, and exposed the cells to two different sources of oxidants--a lipid-soluble azo-initiator of peroxyl radicals, 2,2'-azobis(2,4-dimethyl-valeronitrile), AMVN, and a superoxide generator, xanthine oxidase/xanthine. We demonstrated that both oxidants induced pronounced oxidation of four major classes of cis-parinaric acid-labeled phospholipids-phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol-in normal human epidermal keratinocytes that was not detectable as any significant change of their phospholipid composition. Vitamin E was effective in protecting the cells against phospholipid peroxidation. Since viability of normal human epidermal keratinocytes was not changed either by labeling or exposure to oxidants the labeling protocol and oxidative stress employed are compatible with the quantitative analysis of phospholipid peroxidation in viable cells.
Antioxidants; Phospholipids; Stress; Exposure-levels; Skin; Carcinogenesis; Author Keywords: keratinocytes; phospholipid peroxidation; oxidative stress; xanthine; xanthine oxidase; AMVN; alpha-tocopherol
Anna A. Shvedova, Health Effects Laboratory Division, Pathology and Physiology Research Branch, NIOSH, 1095 Willowdale Road, Morgantown, WV 26505
Pasternak CA; Lennarz WJ
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