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  • Title: Studies on the early changes in rat hepatic fructose 2,6-bisphosphate and enzymes in response to a high protein diet.
    Author: Bois-Joyeux B, Chanez M, Azzout B, Peret J.
    Journal: J Nutr; 1986 Mar; 116(3):446-54. PubMed ID: 3005533.
    Abstract:
    Pertinent hepatic metabolites and enzymes were examined in rats fed a high carbohydrate (HC) diet and during the first 24 h of either starvation or feeding a high protein (HP) diet. Consumption of the HC diet induced slight but definite 24-h oscillations in hepatic concentrations of cyclic AMP, glycogen, glucose 6-phosphate, fructose 2,6-bisphosphate, fructose 1,6-bisphosphate and phosphoenolpyruvate, as well as the activities of 6-phosphofructo-2-kinase/fructose 2,6-bisphosphatase and phosphoenolpyruvate carboxykinase. The transition to starvation or the HP diet induced, within 12 h, concurrent increases in cyclic AMP and phosphoenolpyruvate and decreases in glycogen, glucose 6-phosphate, fructose 6-phosphate, fructose 2,6-bisphosphate and fructose 1,6-bisphosphate. These changes were associated with a decrease in the ratio of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase and an increase in phosphoenolpyruvate carboxykinase. These results suggest that the activity of the fructose 6-phosphate/fructose 1,6-bisphosphate cycle is similar during the first 24 h of starvation or HP consumption.
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