Antioxidant effect of caeruloplasmin on microsomal lipid peroxidation.

Microsomal NADPH-dependent lipid peroxidation catalyzed by ADP-Fe3+ was inhibited by the addition of caeruloplasmin. The antioxidant effect of caeruloplasmin was independent of the superoxide anion (O-2) scavenging activity. Since caeruloplasmin enhanced the function of ADP-Fe3+ acting as electron acceptor for microsomal electron transport system, the antioxidant effect of caeruloplasmin is considered to depend on the ferroxidase activity.