Induction of hepatic malic enzyme in response to insulin.

The activity and quantity of hepatic malic enzyme were determined in diabetic rats at various times after insulin treatment. The increase in activity observed following insulin treatment was accompanied by a similar increase in the quantity of this enzyme, as determined by a specific radioimmunoassay. These results demonstrate that the insulin-mediated increase in malic enzyme activity was due to an increase in the quantity of enzyme and did not involve a modification of existing enzyme molecules.