Changes in subcellular distribution of S-adenosylmethionine decarboxylase in regenerating and in developing rat liver.

Distribution of the activity of S-adenosylmethionine decarboxylase in homogenates of rat liver regenerating after partial hepatectomy and during development are reported. In the stages of rapid growth of liver remaining after partial hepatectomy, an increased activity of S-adenosylmethionine decarboxylase in the supernatant fractions is accompanied by a decreased activity in the crude nuclear fractions. Prior to birth, in the liver of the developing rat, all activity of S-adenosylmethionine decarboxylase is in the supernatant fraction. After birth, activity in the crude nuclear fraction increases rapidly, reaching adult values by the end of weaning.