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The level of glucose-1,6-diphosphate (Glc-1,6-P2), the powerful regulator of carbohydrate metabolism, was found to be strikingly decreased in brains of adult rats (5 months of age) as compared to young (10-14 days of age). 2. This age-related decrease in Glc-1,6-P2, the potent inhibitor of hexokinase and activator of phosphoglucomutase, was accompanied by a correlated increase in the activity of hexokinase and a reduction in phosphoglucomutase. 3. Evidence is provided showing that Glc-1,6-P2 participates in the regulation of these enzymes' activities with age. 4. The age-related changes in Glc-1,6-P2 and in the enzymes' activities in brain were opposite to those which we previously found in skeletal muscle. 5. These results suggest that Glc-1,6-P2 is involved in the regulation of carbohydrate metabolism during growth in both brain and muscle, as well as in the interrelationship between these two tissues.

The level of glucose-1,6-diphosphate (Glc-1,6-P2), the powerful regulator of carbohydrate metabolism, was found to be strikingly decreased in brains of adult rats (5 months of age) as compared to young (10-14 days of age). 2. This age-related decrease in Glc-1,6-P2, the potent inhibitor of hexokinase and activator of phosphoglucomutase, was accompanied by a correlated increase in the activity of hexokinase and a reduction in phosphoglucomutase. 3. Evidence is provided showing that Glc-1,6-P2 participates in the regulation of these enzymes' activities with age. 4. The age-related changes in Glc-1,6-P2 and in the enzymes' activities in brain were opposite to those which we previously found in skeletal muscle. 5. These results suggest that Glc-1,6-P2 is involved in the regulation of carbohydrate metabolism during growth in both brain and muscle, as well as in the interrelationship between these two tissues.

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