Metabolism of histidine in growing rats at various dietary protein levels

Autor:	Hideyuki Tanaka, Masaji Ogura
Rok vydání:	1980
Předmět:	medicine.medical_specialty Low protein Calorie Chemistry Carbon skeleton Metabolism General Biochemistry Genetics and Molecular Biology Endocrinology Dietary protein Urinary excretion Internal medicine medicine Protein retention General Agricultural and Biological Sciences Histidine
Zdroj:	Agricultural and Biological Chemistry. 44:2343-2349
ISSN:	1881-1280 0002-1369
DOI:	10.1271/bbb1961.44.2343
Popis:	The metabolic fate of the carbon skeleton of l-(U-14C)-histidine has been investigated in growing rats fed diets containing different percentages of protein calories (0, 5, 10, 15 and 30 PC%) at 410 kcal of metabolizable energy per 100 g diet.The incorporation of 14C into body protein at 12 hr after injection of 14C-histidine was about 70% of the dose in rats fed 0 to 10 PC% diets, though the value was reduced in rats fed higher PC% diets. The expired 14CO2 production was depressed in the low protein groups, and it showed an inverse pattern to that of 14C incorporation into body protein. Urinary excretion of 14C was about 20% of the dose in all dietary groups. The activities of hepatic histidase, urocanase and histidine-pyruvate aminotransferase were increased in the 30 PC% group.These results indicate that the metabolic response of histidine to dietary protein changes around 10 PC%, where growth rate and body protein retention reached approximate plateaus.The nutritional significance of the metabolism of...
Databáze:	OpenAIRE
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