Differential effects of protein restriction on gamma-glutamyltranspeptidase [EC 2.3.2.2] activity in young and mature rats.
Braz J Med Biol Res
; 29(2): 213-7, 1996 Feb.
Article
em En
| MEDLINE
| ID: mdl-8731351
Gamma-glutamyltranspeptidase (GGT, EC 2.3.2.2) activity was determined in the plasma and liver of 40 young (50 days old) and 40 mature (300 days old) male Wistar rats, after a protein restriction period of 28 days. Casein protein levels used were: 1%, 3%, 5%, 7% and 28% (control). Weanling rats submitted to protein-free diet and adult rats submitted to that and other low-protein diets (1%, 3% or 5% casein) presented weight reductions (-0.38 +/- 0.07 g/day and -0.98 +/- 0.19 g/day, respectively). Only in young animals did these weight reductions parallel those of food consumption (37 +/- 12% of control), plasma protein (52 +/- 11% of control), plasma albumin (70 +/- 12% of control), hepatic RNA (68 +/- 7% of control) and protein (71 +/- 8% of control). A marked effect of the protein restriction, increasing the GGT activity, was also observed only in young rats. A significant (P < 0.05) rise was promoted by the protein-free diet in the plasma GGT (2.83 +/- 1.39 vs 0.69 +/- 0.50 mU/ml for control) and by both the protein-free and 3% casein diets, in the liver GGT (respectively, 16.00 +/- 6.72 and 7.75 +/- 3.49 vs 0.94 +/- 0.57 U/g protein for control). The different results obtained for young in relation to mature animals could be explained by the reduction of both protein and sulfur-containing amino acid requirements with aging.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Dieta com Restrição de Proteínas
/
Gama-Glutamiltransferase
Limite:
Animals
Idioma:
En
Revista:
Braz J Med Biol Res
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Brasil