Anti-oxidative profile of lobenzarit disodium (CCA).

The effects of lobenzarit disodium (CCA) on various species of activated oxygen were investigated in chemiluminescence experiments. CCA showed a quenching effect against hydroxyl radicals generated by Fenton reaction. The inhibition of CCA was much more intense than that of mefenamic acid which is an anti-inflammatory drug and an analogous compound to CCA. CCA also showed a quenching effect against singlet oxygen generated in enzymatic systems. However, CCA had no effect against superoxide anion radicals generated in the xanthine oxidase-hypoxanthine system. As a model of lipid peroxidation and protein alteration induced by activated oxygen, we examined the auto-oxidation of linolenic acid and the UV irradiation of immunoglobulin G (IgG). CCA inhibited the production of lipid peroxide; however CCA did not show a direct quenching action against lipid radicals which had been previously generated. CCA also inhibited the IgG alteration induced by UV irradiation. These results indicate that CCA has anti-oxidative actions with specificity for activated oxygen species and that CCA protects against lipid and protein damage induced by activated oxygen.