scholarly journals Response of the Induction of Rat Liver Serine Dehydratase to Changes in the Dietary Protein Requirement

2003 ◽  
Vol 67 (2) ◽  
pp. 383-387 ◽  
Author(s):  
Saeko IMAI ◽  
Ryuhei KANAMOTO ◽  
Iyo YAGI ◽  
Makoto KOTARU ◽  
Tohru SAEKI ◽  
...  
Keyword(s):  
Rat Liver ◽  
Dietary Protein ◽  
Protein Requirement ◽  
Serine Dehydratase

scholarly journals Quantity as Well as Quality of Dietary Protein Affects Serine Dehydratase Gene Expression in Rat Liver

2003 ◽  
Vol 49 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Saeko IMAM ◽  
Iyo YAGI ◽  
Tohru SAEKI ◽  
Makoto KOTARU ◽  
Kimikazu IWAMI
Keyword(s):  
Gene Expression ◽  
Rat Liver ◽  
Dietary Protein ◽  
Serine Dehydratase

Inverse Correlation between the Nitrogen Balance and Induction of Rat Liver Serine Dehydratase (SDH) by Dietary Protein

2004 ◽  
Vol 68 (4) ◽  
pp. 888-893 ◽  
Author(s):  
Ryuhei KANAMOTO ◽  
Kousuke FUJITA ◽  
Megumi KUMASAKI ◽  
Saeko IMAI ◽  
Makoto KOTARU ◽  
...  
Keyword(s):  
Rat Liver ◽  
Nitrogen Balance ◽  
Dietary Protein ◽  
Inverse Correlation ◽  
Serine Dehydratase

DIETARY PROTEIN REQUIREMENT FOR JUVENILE SPINIBARBUS SINENSIS

2009 ◽  
Vol 33 (4) ◽  
pp. 674-681 ◽  
Author(s):  
Xiao-Zhi LIN ◽  
Xiao-Jun XIE ◽  
Yi-Ping LUO
Keyword(s):  
Dietary Protein ◽  
Protein Requirement ◽  
Spinibarbus Sinensis

Dietary protein paradox: decrease of amino acid availability induced by high-protein diets

1993 ◽  
Vol 264 (6) ◽  
pp. G1057-G1065 ◽  
Author(s):  
C. Moundras ◽  
C. Remesy ◽  
C. Demigne
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Dietary Protein ◽  
High Protein ◽  
Glutamine Metabolism ◽  
Metabolic Adaptation ◽  
Casein Diet ◽  
Serine Dehydratase ◽  
High Protein Diets ◽  
Protein Diets

The aim of the present study was to evaluate the effect of changes in dietary protein level on overall availability of amino acids for tissues. For this purpose, rats were adapted to diets containing various concentrations of casein (7.5, 15, 30, and 60%) and were sampled either during the postprandial or postabsorptive period. In rats fed the protein-deficient diet, glucogenic amino acids (except threonine) tended to accumulate in plasma, liver, and muscles. In rats fed high-protein diets, the hepatic balance of glucogenic amino acids was markedly enhanced and their liver concentrations were consistently depressed. This response was the result of a marked induction of amino acid catabolism (a 45-fold increase of liver threonine-serine dehydratase activity was observed with the 60% casein diet). The muscle concentrations of threonine, serine, and glycine underwent changes parallel to plasma and liver concentrations, and a significant reduction of glutamine was observed. During the postabsorptive period, adaptation to high-protein diets resulted in a sustained catabolism of most glucogenic amino acids, which accentuated the drop in their concentrations (especially threonine) in all the compartments studied. The time course of metabolic adaptation from a 60 to a 15% casein diet has also been investigated. Adaptation of alanine and glutamine metabolism was rapid, whereas that of threonine, serine, and glycine was delayed and required 7-11 days. This was paralleled by a relatively slow decay of liver threonine-serine dehydratase (T-SDH) activity in contrast to the rapid adaptation of pyruvate kinase activity after refeeding a high-carbohydrate diet.(ABSTRACT TRUNCATED AT 250 WORDS)

Dietary Protein Requirements of Fishes — A Reassessment

1987 ◽  
Vol 44 (11) ◽  
pp. 1995-2001 ◽  
Author(s):  
Stephen H. Bowen
Keyword(s):  
Growth Rate ◽  
Dietary Protein ◽  
Protein Concentration ◽  
Trophic Ecology ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Intake Rate ◽  
Protein Requirement ◽  
Fish Physiology ◽  
Protein Retention

It is widely believed that fishes require more dietary protein than other vertebrates. Many aspects of fish physiology, nutrition, and trophic ecology have been interpreted within the context of this high protein requirement. Here, fishes are compared with terrestrial homeotherms in terms of (1) protein requirement for maintenance, (2) relative protein concentration in the diet required for maximum growth rate, (3) protein intake rate required for maximum growth rate, (4) efficiency of protein retention in growth, and (5) weight of growth achieved per weight of protein ingested. The two animal groups compared differ only in relative protein concentration in the diet required for maximum growth rate. This difference is explained in terms of homeotherms' greater requirement for energy and does not reflect absolute differences in protein requirement. The remaining measures of protein requirement suggest that fishes and terrestrial homeotherms are remarkably similar in their use of protein as a nutritional resource. Reinterpretation of the role of protein in fish physiology, nutrition, and trophic ecology is perhaps in order.

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