Role of Ornithine in Urea Synthesis in Rats Treated with Thyroid Hormone
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概要
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The purpose of this study was to find whether the regulation of urea synthesis was mediated through the activation of N-acetylglutamate synthesis by ornithine when the thyroid status was manipulated. Experiments were done on three groups of rats, given 6-propyl-2-thiouracil (PTU, a thyroid inhibitor) without triiodothyronine (T_3) treatment, treated with PTU + T_3, or neither PTU nor T_3 (control). Urinary excretion of urea and the liver concentrations of ornithine and N-acetylglutamate in rats given PTU + T_3 were significantly lower than in rats given PTU alone. The liver concentration of N-acetylglutamate was correlated with the liver concentration of ornithine (r=0.920, p<0.001). Ornithine administration (0.5mmol/100g body wt) elevated the liver concentration of N-acetylglutamate in all three groups. The results suggest that the greater concentration of ornithine in the hypothyroid (PTU alone) rats is likely to increase the N-acetylglutamate concentration in liver and stimulate urea synthesis.
- 社団法人日本農芸化学会の論文
- 1995-05-23
著者
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HAYASE Kazutoshi
Department of Home Economics, Aichi University of Education
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YOSHIDA AKIRA
Department of Radiological Sciences, Hiroshima Prefectural College of Health Science
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Hayase Kazutoshi
Department Of Home Economics Aichi University Of Education
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Yoshida Akira
Department Of Agricultural Chemistry Nagoya University
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Yoshida Akira
Department Of Food And Nutritional Sciences Nagoya Bunri Junior College
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