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Regulation of hepatic phosphoenol pyruvate carboxy kinase ec role of dietary proteins and amino acids in vivo and in the isolated perfused rat liver

, : Regulation of hepatic phosphoenol pyruvate carboxy kinase ec role of dietary proteins and amino acids in vivo and in the isolated perfused rat liver. Biochimica et Biophysica Acta 632(4): 473-482

The effect of protein feeding and the addition of amino acids on the activity of hepatic phosphoenolpyruvate carboxykinase (GTP: oxaloacetate carboxylyase (transphosphorylating), EC was investigated in vivo and in the isolated perfused rat liver. Protein feeding resulted in a considerable increase in phosphoenolpyruvate carboxykinase activity within 6 h. This rise was independent of the presence of glucocorticoids. In the isolated perfused liver system amino acids had a small effect on phosphoenolpyruvate carboxykinase activity and led to an increase by 20% when glucocorticoids were present, but resulted in a rise by 100% when glucocorticoids plus dibutyryl cAMP were added to the perfusion medium. The effect of amino acids in the presence of dibutyryl cAMP could be observed in the liver of glucocorticoid-deprived rats. Cycloheximide, a translational inhibitor, totally blocked all effects of amino acids on enzyme activity. The concentration of amino acids in the portal vein modify the regulation of phosphoenolpyruvate carboxykinase by cAMP.

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