Hemoglobin induced apolipoprotein B crosslinking in low-density lipoprotein peroxidation

Archives of Biochemistry and Biophysics
Y I MillerN Shaklai

Abstract

Oxidative modification of human low-density lipoprotein (LDL) is thought to play a major role in the development of atherosclerosis. Free hemin, hemoglobin, myoglobin, and horseradish peroxidase (HRP) were reported in different studies as promoters of LDL lipid oxidation. Based on our previous finding that hemin induced oxidative crosslinking of the LDL protein, apolipoprotein B (apo B) (Y. I. Miller and N. Shaklai (1994) Biochem. Mol. Biol. Int. 34, 1121-1129), we compared the ability of free hemin and the above hemoproteins to induce peroxidation modification of apo B using SDS-PAGE. The levels of the final products of lipid peroxidation were determined as thiobarbituric acid-reactive substances. Hemoglobin and myoglobin were found to be as active as free hemin and all these were much more active than the classic peroxidase HRP. Moreover, the products of oxidized apo B differed: hemoglobin, myoglobin, and hemin induced mostly covalent aggregates, while HRP caused fragmentation of apo B. Hemoglobin reactivity was expressed at low H2O2 concentrations even in the absence of molecular oxygen. Desferal, along with other antioxidants, inhibited the hemoglobin-induced LDL oxidation independently of its iron-chelating property. The h...Continue Reading

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