ウニ胚の炭水化物代謝経路(予報)

概要

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The ^<14>CO_2 production form glucose-1-^<14>C and glucose-6-^<14>C was determined in embryos of the sea urchin, Pseudocentrotus depressus (Table 1). The ratio E, (^<14>CO_2 from glucose-6-^<14>C) was regarded as a measure of the rate of glucose breakdown via the Embden-Meyerhof-Parnas glycolytic pathway and the tricarboxylic acid cycle, and P (=1-E) as the rate of glucose breakdown via the pentose phosphate cycle. The ration P/E increased upon fertilization and during cleavage stages, but dropped after hatching. On the basis of E- and P-values and respiratory quotients (Isono, 1963a), the changes in oxygen uptake during embryonic development was analysed as shown in Figure 1. It will be seenthat: (1) An increase upon fertilization is due mainly to an activation of carbohydrate breakdown via the pentose phosphate cycle. (2) An increase during cleavage stages is due to a further increase in carbohydrate breakdown via the pentose phosphate cycle. (3) An increase after hatching is due to an activation of lipid oxidation.
社団法人日本動物学会の論文
1966-09-15