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Lipids
1985 Mar 01;203:151-7. doi: 10.1007/bf02534247.
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Fatty acid metabolism and cell proliferation. VII. Antioxidant effects of tocopherols and their quinones.
Lindsey JA
,
Zhang HF
,
Kaseki H
,
Morisaki N
,
Sato T
,
Cornwell DG
.
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The antioxidant capacities of alpha- and gamma-tocopherols (alpha-E and gamma-E) and their quinones (alpha-EQ and gamma-EQ) were determined in non-biological and biological systems. The non-biological system consisted of arachidonic acid [20:4 (n-6)], the oxidant cumene hydroperoxide, and a Fe3+ catalyst to facilitate malondialdehyde (MDA) formation from lipid peroxides. alpha-E and gamma-E had similar antioxidant capacities in this system. alpha-EQ also functioned as an antioxidant, while gamma-EQ exhibited a crossover effect by functioning as an antioxidant at low concentrations and a prooxidant at high concentrations. Biological lipid peroxidation in smooth muscle cells challenged with 20:4 (n-6) was measured both by MDA formation in confluent cultures and by cell growth in proliferating cultures. alpha-E, gamma-E and alpha-EQ had similar antioxidant capacities, but gamma-EQ was highly cytotoxic for cells in both confluent and proliferating cultures. Cellular retention of antioxidants was estimated indirectly from MDA formation when cells were loaded with an antioxidant (preincubation) and then incubated for varying periods of time in fresh media containing 20:4 (n-6). Cellular retention also was measured directly with tritiated alpha-E and tritiated alpha-EQ. These studies showed that cellular retention decreased in the sequence gamma-E greater than alpha-E greater than alpha-EQ. Thus, cellular retention does not explain the enhanced antioxidant capacity of alpha-E compared to gamma-E that has been reported for animal systems. The antioxidant capacity of alpha-E evidently is enhanced by its metabolism to a quinone which, unlike the quinone from gamma-E, functions as a biological antioxidant.
BUNYAN,
THE VITAMIN E ACTIVITY OF ALPHA-TOCOPHERYLQUINONE AND ALPHA-TOCOPHERYLHYDROQUINONE IN THE RAT.
1963, Pubmed
BUNYAN,
THE VITAMIN E ACTIVITY OF ALPHA-TOCOPHERYLQUINONE AND ALPHA-TOCOPHERYLHYDROQUINONE IN THE RAT.
1963,
Pubmed
Chiku,
Novel urinary metabolite of d-delta-tocopherol in rats.
1984,
Pubmed
Cornwell,
Polyunsaturated fatty acids, vitamin E, and the proliferation of aortic smooth muscle cells.
1979,
Pubmed
Dillard,
Relative antioxidant effectiveness of alpha-tocopherol and gamma-tocopherol in iron-loaded rats.
1983,
Pubmed
Draper,
Metabolism and function of vitamin E.
1969,
Pubmed
GREEN,
Studies on vitamin E. 2. Reversal of respiratory decline in nutritional liver necrosis by intraportal administration of tocopherols and other substances.
1960,
Pubmed
Gallo-Torres,
Distribution and metabolism of two orally administered esters of tocopherol.
1971,
Pubmed
Gavino,
Polyunsaturated fatty acid accumulation in the lipids of cultured fibroblasts and smooth muscle cells.
1981,
Pubmed
Gavino,
Image analysis for the automated estimation of clonal growth and its application to the growth of smooth muscle cells.
1982,
Pubmed
Gavino,
Effect of polyunsaturated fatty acids and antioxidants on lipid peroxidation in tissue cultures.
1981,
Pubmed
Huttner,
Fatty acids and their prostaglandin derivatives: inhibitors of proliferation in aortic smooth muscle cells.
1977,
Pubmed
KRISHNAMURTHY,
THE ABSORPTION, STORAGE, AND METABOLISM OF ALPHA-TOCOPHEROL-C14 IN THE RAT AND CHICKEN.
1963,
Pubmed
Liepkalns,
Regulation of cell division in a human glioma cell clone by arachidonic acid and alpha-tocopherolquinone.
1982,
Pubmed
Mellors,
The distribution and metabolism of alpha-tocopherol in the rat.
1966,
Pubmed
Miller,
Triglycerides, lipid droplets, and lysosomes in aorta smooth muscle cells during the control of cell proliferation with polyunsaturated fatty acids and vitamin E.
1980,
Pubmed
Morisaki,
Fatty acid specificity in the inhibition of cell proliferation and its relationship to lipid peroxidation and prostaglandin biosynthesis.
1982,
Pubmed
Morisaki,
Dipyridamole: an antioxidant that promotes the proliferation of aorta smooth muscle cells.
1982,
Pubmed
Morisaki,
Fatty acid metabolism and cell proliferation. V. Evaluation of pathways for the generation of lipid peroxides.
1984,
Pubmed
Panganamala,
The effects of vitamin E on arachidonic acid metabolism.
1982,
Pubmed
Peake,
Alpha- and gamma-tocopherol in the rat: in vitro and in vivo tissue uptake and metabolism.
1971,
Pubmed
Peake,
A comparison of the intestinal absorption, lymph and plasma transport, and tissue uptake of -and -tocopherols in the rat.
1972,
Pubmed