Effect of dietary proteins on time-dependent changes in plasma @entity535 levels and on liver protein synthesis in XXXX .

@entity1522 @entity1423 @entity535 @entity3880 @entity1460 @entity35
The effects of four dietary proteins on plasma @entity535 ( @entity3880 ) levels in portal vein and aorta and on hepatic @entity1423 were investigated in @entity35 fed 10% protein diets ad libitum. Proteins studied were beef, casein, rapeseed and @entity1460 . Measurements were made at 2000, 2300, 0200, 0500 and 0800 h. Portoaortic differences in essential @entity1522 (EAA) in plasma were calculated and compared to dietary EAA to verify the time-dependent changes in their intestinal absorption. Each protein generated different variations in portal and aortic @entity3880 levels. Rapeseed produced the lowest plasma concentrations of EAA, but its portoaortic differences were as large as those of the other proteins. With each protein, proportions of EAA in plasma (in contrast to concentrations) tended to remain constant in portal vein and aorta over the 12-h period. Significant correlations between portoaortic differences and dietary EAA were found in all groups, but at varying times, indicating that the kinetics of intestinal absorption were dependent on the protein fed. So were variations in liver polysome distribution. For rapeseed and @entity1460 , times of most active protein synthesis were 0200 and 0500 h; with beef and casein, variations between sampling times were not significant. No direct relationship was found between magnitude and composition of @entity3880 portoaortic differences and @entity1423 . Thus these two parameters were both affected by dietary proteins, but no synchrony was evidenced between them.
