3-Hydroxyanthranilic acid is an efficient, cell-derived co-antioxidant for alpha-tocopherol, inhibiting human low density lipoprotein and plasma lipid peroxidation.

The Journal of Biological Chemistry
S R ThomasR Stocker

Abstract

alpha-Tocopherol (alpha-TOH) can promote lipid peroxidation in human low density lipoprotein (LDL) unless co-antioxidants are present that eliminate the chain-carrying alpha-tocopheroxyl radical (alpha-TO.) (Bowry, V. W., Mohr, D., Cleary, J., and Stocker, R. (1995) J. Biol. Chem. 270, 5756-5763). Interferon-gamma inhibits human monocyte/macrophage-facilitated LDL lipid peroxidation via induction of cellular tryptophan degradation and production and release of 3-hydroxyanthranilic acid (3HAA) (Christen, S., Thomas, S. R., Garner, B., and Stocker, R. (1994) J. Clin. Invest. 93, 2149-2158). We now report on the mechanism of antioxidant action of 3HAA. 3HAA directly reduced alpha-TO. in UV-exposed micellar dispersions of alpha-TOH or in LDL incubated with soybean 15-lipoxygenase (SLO), as assessed by electron paramagnetic resonance spectroscopy. 3HAA did not inhibit SLO enzyme activity. Anthranilic acid, which lacks the phenoxyl group, was incapable of reducing alpha-TO.. 3HAA dose-dependently inhibited the peroxidation of surface phospholipids and core cholesteryl esters in LDL exposed to SLO, peroxyl radicals (ROO.), or Cu2+; oxidants that convert alpha-TOH to alpha-TO.. In all cases, sparing of LDL's alpha-TOH, but not ubiquino...Continue Reading

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