Effect of administration of triiodothyronine on aspartate aminotransferase in pyridoxine-deficient rats.

The state of thyroid function and the effect of triiodothyronine (T3) administration on aspartate aminotransferase isozymes in the livers of rats fed on a diet with or without pyridoxine were examined. Decreased thyroid function in pyridoxine-deficient rats was demonstrated using malic enzyme as a marker of thyroid function in the liver. Administration of T3 increased cytosolic aspartate aminotransferase in the liver of pyridoxine-deficient rats, but not of control rats.