The protective effects of major boysenberry anthocyanins (BoAnt) against oxidative stress were investigated in streptozotocin (STZ)-induced diabetic rats. Increases in the concentration of plasma thiobarbituric acid reactive substances (TBARS), and in the liver 8-hydroxy deoxyguanosine (8-OH dG)/deoxyguanosine (dG) ratio and also in the liver GSSG/GSH ratio, which were all observed in STZ-injected rats, were restored or tended to be restored to the level of the control rats when a diet with BoAnt was given to the diabetic animals. The susceptibility of the liver homogenate of the diabetic rats to the oxidation by AAPH was relieved when BoAnt was fed to them. These results suggested that BoAnt was effective in protecting the development of in vivo oxidation involved with diabetes.
The preventive effects of dietary nasunin on a liver injury induced by D-galactosamine (GalN) were investigated in rats. Increases in plasma alanine aminotransferase (ALT), aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) activities, which were induced by GalN, were suppressed by the feeding of nasunin before the intraperitoneal injection of GalN. Increases in liver oxidized-form glutathione (GSSG) concentration and the ratio of GSSG to reduced-form glutathione (GSH) by the injection of GalN were also suppressed by the dietary nasunin. A slight increase in the liver ␣-tocopherol concentration and an increase in the liver SOD activity due to the injection of GalN tended to return to the level of the control rat by the feeding of the nasunin. These results suggested that nasunin is effective to prevent liver injury and that it is also effective to prevent oxidative stress which may be induced by GalNinduced liver injury.
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