Gonadal Steroids Delay Spontaneous Flounder Metamorphosis and Inhibit T_3-induced Fin Ray Shortening in vitro(Endocrinology)
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概要
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Although it is now clear that the major hormones controlling metamorphosis of the Japanese Flounder, Paralichthys olivaceus, are the thyroid hormones, thyroxine and triiodothyronine, other hormones modulate their effects. The aim of the present study was to determine the effects of the sex steroids, estradiol and testosterone, on the resorption of the dorsal fin rays of flounder in vitro, and on spontaneously metamorphosing larvae. Neither estradiol nor testosterone (100 ng/ml) had any direct effect on fin ray shortening. However, they exerted inhibitory effects on thyroid hormoneinduced fin ray resorption. Immersion of flounder larvae in 100 ng/ml solution of either estradiol or testosterone also resulted in a delay in metamorphic features such as fin ray shortening, eye migration and settling. Measurement of whole-body concentrations of estradiol and testosterone during metamorphosis revealed no significant changes, and levels remained low (below 1 ng/g) throughout the larval period. These results are discussed in relation to the possible interraction between thyroid hormones and sex steroids.
- 1992-06-15
著者
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Hirano Tetsuya
Ocean Research Institute University Of Tokyo
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Inui Yasuo
National Research Institute Of Aquaculture
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DE JESUS
Ocean Research Institute, University of Tokyo
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De Jesus
Ocean Research Institute University Of Tokyo
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Hirano Tetsuya
Ocean Research Institute University
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