The effect of phenobarbital and 3'-methyl-N,N-dimethyl-4-aminoazobenzene administration on catalytic, binding and immunological properties of ligandin subunits in rat liver.

Following administration of phenobarbital to rats, liver ligandin content, bilirubin binding, glutathione-S-transferase and steroid isomerase activities increased by 150% and the 22000-dalton subunit was selectively increased. Following administration of 3'-methyl-N,N-dimethyl-4-aminoazobenzene, rat liver ligandin content and steroid isomerase decreased by 65%, glutathione-S-transferase increased by 100%, bilirubin binding was abolished, and the relative proportion of the 22000- and 25000-dalton subunits remained unchanged.