Abstract
Liver glucose 6-phosphate dehydrogenase and phosphogluconate dehydrogenase activities were significantly decreased in both diabetic and fasted rats. Treatment of diabetic rats with insulin resulted in liver glucose 6-phosphate dehydrogenase and phosphogluconate dehydrogenase activities that were significantly greater than controls. Insulin promoted an increase in food consumption that was blocked by adrenaline. Insulin, when administered together with adrenaline, restored hepatic glucose 6-phosphate dehydrogenase and phosphogluconate dehydrogenase activities of diabetic animals to control values, without altering food consumption. Brain glucose 6-phosphate dehydrogenase and phosphogluconate dehydrogenase activities were not significantly altered by either dietary restriction, diabetes or insulin treatment. These results demonstrate a dissociation between the action of insulin on hepatic glucose 6-phosphate dehydrogenase activity and its action to increase food intake.
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