Isolation and properties of protein component as activator for anthranilamide hydroxylation in rat liver

The effect of sulfhydryl compounds on the catalytic activity of Cu, Zn-superoxide dismutase purified from rat liver

Sulfhydryl compounds such as reduced glutathione, cysteine and 2-mercaptopropionylglycine, a hepato-protective agent, activated Cu, Zn-superoxide dismutase purified from rat liver at low concentrations (below 10 microM). Furthermore we found evidence indicating that this activation is achieved by reducing Cu2+ present in the catalytic site of the dismutase, and thereby promoting the dismutation of superoxide anions.

Anthranilic acid metabolism in the isolated perfused rat liver: Detection and determination of anthranilic acid and its related substances using high-performance liquid chromatography with electrochemical detection

In order to elucidate the anthranilic acid metabolism in animal tissue, the metabolism was studied in the isolated perfused liver of rats. A sensitive and rapid method was devised for determination of anthranilic acid and its related substances using high-performance liquid chromatography with electrochemical detection. 5-Hydroxyanthranilic acid and anthranilamide, which have not been detected in animal tissue, were found in the perfusate and in the bile secreted from the perfused liver, respectively. In addition, a non-enzymatic production of anthranilamide from anthraniloyl glucuronide in the presence of ammonium and bicarbonate ions was also observed. These present results suggest that, apart from undergoing glycine or glucuronide conjugation, anthranilic acid is metabolized to 5-hydroxyanthranilic acid and anthranilamide in the rat liver.