カキに対するステロイドの影響-VI. : エストラジオール-17βによる雌マガキのグリコーゲン分解促進に関する室内実験

概要

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The effect of estradiol-17β on the tissue distribution of PAS-positive substance digestable by saliva-treatment, namely, glycogen was studied using the Japanese common oysters during sexual maturation. The experiment was carried out indoors. In oysters which were kept in sea water containing low concentrations of estradiol-17β (total steroid applied, 4 μg and less/oyster), sexual maturation proceeded normally without sex reversal and an acceleration of glycogenolysis by this steroid was found in females. However, no such effect was seen in the experimental groups treated with high concentrations (10 μg and over/oyster) except at a level of 1, 000-4, 000 μg/oyster. These results indicate that the concentration of steroid applied is of special importance for the appearance of such an effect. The decrease in the glycogen amount which was observed in the 1, 000-4, 000 μg group should be considered to be qualitatively different from that occurring in the 4 μg and less group, because of the high frequency of mortality which is most likely due to serious pathological changes in the digestive diverticula. The present study together with the previous one1) strongly suggests that the acceleration of glycogenolysis by estradiol-17β may occur in female C. gigas provided that sexual maturation proceeds normally without sex reversal.