飼料脂質に対するハマチ肝臓酵素の適応〔魚類の代謝調節-1-〕

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The effects of dietary lipid on the activities of several hepatic enzymes relating to the metabolism of protein, lipid and carbohydrate were investigated in young yellowtail, Seriola quinqueradiata, fed for 30 days on isocaloric diets containing differing levels of lipid (5-22%) and protein (68-40%). Each enzyme activity changed markedly in response to the dietary lipid, but it required a long period (20-30 days) for the adaptation. In general, the feeding of high fat diets lowered the activities of hepatic alanine aminotransferase, arginase, glucose-6-phosphatase, fructose-biphosphatase, phosphorylase, 6-phosphofructokinase, glucose-6-phosphate dehydrogenase, phosphogluconate dehydrogenase (decarboxylating) and malate dehydrogenase (oxaloacetate-decarboxylating) (NADP+). At the end of the experiments, the highest activity of most enzymes was found in the liver of the fish fed on the lowest lipid diet, and the enzyme activities correlated negatively with the dietary lipid levels. There were similar negative correlations between dietary lipid level and concentrations of protein, amino nitrogen and glucose in the plasma and of glycogen in the liver, but there was a positive correlation between dietary lipid level and the liver fat content. These data suggest that dietary lipid causes a repression of amino acid degradation, gluconeogenesis, glycolysis and lipogenesis as well as a facilitation of the assimilation or preservation of the lipid in the fish liver, and that the protein sparing effect of lipid results from the comprehensive regulation of many enzymes relating to the metabolishm of protein, lipid and carbohydrate.
日本水産學會の論文

飼料脂質に対するハマチ肝臓酵素の適応〔魚類の代謝調節-1-〕

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