コイにおけるエネルギ-源としての脂肪酸の選択性〔魚類の脂肪酸代謝に関する研究-8-〕

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In order to elucidate, in vivo, the selevtive utilization of fatty acid as the energy source in carp Cyprinus carpio, the incorporation of 1-14C-acetate and 1-14C-18:1ω9 acid into lipid fraction, their excretion as 14CO2 and the changes of lipid content and fatty acid composition were studied in starved carp. The formation of fatty acid from acetate and the syntesis of triglyceride from 18:1ω9 acid were extremely depressed during starvation, while β-oxidation was accelerated. After 34 days, the total lipid content in the whole body fell remarkably owing to the decrease of the triglyceride content. Thus, the authors inferred that the change of fatty acids in the triglyceride during starvation might be attributable to the fatty acids being utilized as energy source in carp. In the body triglyceride of carp starved for 66 days, 22:6ω3 acid comprised 56% of the total acids; however, both the percentages of 18:1ω9 and 18:2ω6 acids were reduced to as low as 23% of their initial levels. 18:3ω3, 20:3ω9 and 20:4ω6 acids remained almost unchanged during the starvation. Consequently, it was judged that the composition of fatty acid in the body triglyceride was changed by the selective utilization of fatty acids as energy source rather than by the acceleration of chain elongation and desaturation of the fatty acids. In conclusion, these results indicated that 18:1ω9 and 18:2ω6 acuds were preferentially utilized as energy source in carp, whereas 22:6ω3 acid was utilized minimally.
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コイにおけるエネルギ-源としての脂肪酸の選択性〔魚類の脂肪酸代謝に関する研究-8-〕

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