PMID: 2879568Feb 14, 1987Paper

The antioxidant activity of haptoglobin towards haemoglobin-stimulated lipid peroxidation

Biochimica Et Biophysica Acta
J M Gutteridge

Abstract

Haemoglobin stimulates the peroxidation of lipids in two discernable phases. The first phase is inhibited by binding haemoglobin to the protein haptoglobin. The second phase is stimulated by complexable iron released from the haemoglobin molecule during the process of lipid peroxidation. This latter peroxidation is inhibitable by transferrin and the iron chelator desferrioxamine. Heat-denatured haemoglobin and haemin both stimulated lipid peroxidation but this is not inhibitable by haptoglobin. It is suggested that the haptoglobins play an important antioxidant role in vivo by preventing iron-stimulated formation of oxygen radicals.

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