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The Quantity of Dietary Protein Affects Brain Protein Synthesis Rate in Aged Rats

Manuscript received 11 February 1998. Initial reviews completed 30 March 1998. Revision accepted 19 May 1998.

Kazutoshi Hayase, Miho Koie, and Hidehiko Yokogoshi*

Department of Home Economics, Aichi University of Education, Kariya, Aichi 448-8542, Japan and * Laboratory of Nutritional Biochemistry, School of Food and Nutritional Sciences, The University of Shizuoka, Yada, Shizuoka 422-8526, Japan

The purpose of this study was to determine whether the quantity of dietary protein affects the rate of brain protein synthesis in aged rats. Experiments were conducted on three groups of 30-wk-old rats fed diets containing 0, 5 or 20 g casein/100 g for 10 d. The fractional rates of protein synthesis in brain, liver and kidney declined with a decrease in quantity of dietary protein. In brain, liver and kidney, RNA activity [g protein synthesized/(g RNA·d)] was significantly correlated with the fractional rate of protein synthesis. The RNA concentration (mg RNA/g protein) was not related to the fractional rate of protein synthesis in any organ. The results suggest that the rate of protein synthesis in the brain declines with a decrease in quantity of dietary protein in aged rats, and that RNA activity is at least partly related to the fractional rate of brain protein synthesis.

Key words: dietary protein, age, protein synthesis bullet  brain, rats.

The Journal of Nutrition Vol. 128 No. 9 September 1998, pp. 1533-1536
Copyright ©1998 by the American Society for Nutritional Sciences




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