Effect of Dietary Ornithine on the Brain Protein Synthesis Rate in Hypophysectomized Aged Rats

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概要

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• The purpose of this study was to determine whether the regulation of brain protein synthesis is mediated through changes in the plasma concentration of growth hormone (GH) when dietary ornithine treatment is manipulated in the hypophysectomized or sham-operated aged rats. Experiments were done on four groups of hypophysectomized and sham-operated (24-wk-old) male rats given 0% or 0.7% ornithine-HCl added to a 20% casein diet. The concentrations of plasma GH and fractional rates of protein synthesis in the brains increased significantly with the 20% casein+0.7% ornithine compared with the 20% casein diet alone in the sham-operated rats. However ornithine supplementation to the basal diet did not affect the rates of protein synthesis in the hypophysectomized rats. In the cerebral cortex and cerebellum, the RNA activity [g protein synthesized/(g RNA•d)] significantly correlated with the fractional rate of protein synthesis. The RNA concentration (mg RNA/g protein) was also related to the fractional rate of protein synthesis in these organs. The results suggest that the treatment with ornithine is likely to increase the concentration of GH and the rate of brain protein synthesis in the sham-operated rats only, not in the hypophysectomized rats, and that the ornithine-induced increase in the concentration of GH may be primarily responsible for changes in the brain protein synthesis. The RNA activity is at least partly related to the fractional rate of brain protein synthesis.

• 財団法人 学会誌刊行センターの論文

著者

• Morishita Koji

  Healthcare Product Development Center Kyowa Hakko Bio Co. Ltd.

• Tujioka Kazuyo

  Faculty Of Early Childhood Care And Education Ohkagakuen University

• Hayase Kazutoshi

  Department Of Home Economics Aichi University Of Education

• Yamada Takashi

  Department Of Animal Science Graduate School Of Agricultural Science Kobe University

• Aoki Mami

  Healthcare Products Development Center Kyowa Hakko Bio Co. Ltd.

• YOKOGOSHI Hidehiko

  Department of Food and Nutritional Sciences, College of Bioscience and Biotechnology, Chubu University

• YOKOGOSHI Hidehiko

  Department of Agricultural Chemistry, Nagoya University

• ABIKO Hiromi

  Laboratory of Nutritional Biochemistry, School of Nutritional Sciences, The University of Shizuoka

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