Nutrition of Threonine |
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| Authors: | Michiko Yamashita Teiichi Eto Yukio Okazawa Masao Fujimaki Yosito Sakurai |
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| Affiliation: | 1. Department of Agricultural Chemistry, The University of Tokyo, Tokyo;2. Department of Veterinary Physiology, The University of Tokyo, Tokyo;3. Department of Home Economics, The Japan Women’s University, Tokyo |
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| Abstract: | By administering 2 mg/day of cortisone acetate to adrenalectomized rats, the hepatic threonine dehydratase activity of these rats increased 5 times as much as that of the control. By administering 5 IU/day of ACTH to hypophysectomized rats, both the hepatic threonine dehydratase activity and the adrenal glucose-6-phosphate dehydrogenase activity increased 3 times and 7 times as much as that of the control group, respectively. The effects of excess feeding of lysine or threonine on the increase of the dehydratase activity by the adminitration of cortisone to the adrenalectomized rats and the administration of ACTH to the hypophysetomized rats were negative. When the intact rats were fed on lysine and/or threonine excess diet, the amount of glucocorticoid secretion as measured by the adrenal glucose-6-phosphate dehydrogenase activity increased and the hepatic threonine dehydratase activity increased accordingly. A linear relationship was found between these two activities and no significant deviation from the relationship due to the difference in diet composition was observed. A mechanism was proposed, based on these results, explaining the fact that the hepatic threonine dehydratase activity increased when rats were fed on lysine or threonine excess diet. |
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