カイコの蛹期における窒素異化代謝の研究 : 第1報尿酸の分布・生成様相およびタンパク質量の変動

概要

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Accumulation and distribution of uric acid in the silkworm, Bombyx mori, were studied in relation to histolysis and histogenesis during the pupal period. Injected 2-^<14>C-uric acid was not metabolized any further, from which it is concluded that uric acid is really the endproduct of nitrogen metabolism in silkworm pupae. Uric acid is distributed mainly in the fat body during the early half of the pupal period, but in the mid-pupal stage it is largely transferred to the rectal sac. After eclosion it is excreted with the meconium. In the male, uric acid increases rapidly in the mid-pupal stage and again shortly before emergence, whereas in the female it is maintained at a constant level until the late pupal stage, when a rapid increase occurs. The two sexes also differ in the changes of total protein content : in the male protein begins to decrease from the mid-pupal stage, while in the female it changes only a little until shortly before emergence and then decreases rapidly. The sum of the nitrogen lost from protein and free amino acids during the pupal period accounts for the nitrogen gained in uric acid. These results indicate that the lost protein is catabolized to uric acid via the amino acid pool.
日本応用動物昆虫学会の論文
1971-09-25