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Nutritional Neurosciences
Research Communication

Dietary Genistein Affects Brain Protein Synthesis Rates in Ovariectomized Female Rats

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

¹To whom correspondence should be addressed. E-mail: khayase{at}auecc.aichi-edu.ac.jp.

The purpose of this study was to determine whether genistein affects the rate of brain protein synthesis in ovariectomized female rats. Experiments were conducted on three groups of 12-wk-old female rats: those in group 1 were ovariectomized to reduce the level of plasma sex hormone; those in group 2 were ovariectomized and fed diets containing 0.01% genistein; and those in group 3 were sham-operated controls. The fractional rates of protein synthesis in the brain of ovariectomized rats fed genistein were significantly greater than those in ovariectomized rats without genistein treatment. In the cerebral cortex and cerebellum, the RNA activity [g protein synthesized/(g RNA·d)] significantly correlated (r > 0.86, P < 0.001) 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 addition of genistein to the diet of ovariectomized female rats is likely to increase the rate of protein synthesis in the brain, and that RNA activity is at least partly related to the fractional rate of brain protein synthesis.

KEY WORDS: • brain • isoflavone • ovariectomy • protein synthesis • rats