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首页> 外文期刊>Journal of Fish Biology >Melatonin concentrations during larval and postlarval development of gilthead sea bream Sparus auratus: more than a time-keeping molecule?
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Melatonin concentrations during larval and postlarval development of gilthead sea bream Sparus auratus: more than a time-keeping molecule?

机译：head头鲷的幼体和幼体发育过程中褪黑激素的浓度：不仅仅是一个计时分子？

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摘要

In this study, melatonin (MEL) and thyroxine (T4) concentrations were measured during larval and postlarval development of gilthead sea bream Sparus auratus Hormones were measured in whole bodies of larvae or the head and trunk of postlarvae after 67 days of exposure to constant light, 24L:0D, constant darkness, 0L:24D or 12L:12D and in the plasma of 6 month juveniles kept under the 12L:12D, 0L:24D and 24L:0D regimes. High MEL concentrations in larvae suggested a distinct role of MEL in early organogenesis and development of S. auratus. In larvae, the gastro-intestinal tract seemed to be an important extrapineal and extraretinal source of MEL. No endogenous rhythm of MEL synthesis was demonstrated in 67 day larvae; however, in 6 month juveniles, it was evident. At early ontogenesis of S. auratus, the role of MEL is probably related mostly to the control of development and protection against free radicals, whereas its action as a time-keeping molecule develops later. The increase in T4 concentration during the S. auratus larva-juvenile transition, i.e. between 50 and 70 days post-hatch, which was observed concurrently with the decrease of MEL concentration, may suggest an inverse relationship between T4 and MEL.
机译：在这项研究中，测定了在暴露于恒定光照67天后的金头鲷的幼鱼和幼虫的发育过程中褪黑激素（MEL）和甲状腺素（T4）的浓度，并在整个幼体或幼体头和躯干中测量了金头鲷鲷的生长。 ，24L：0D，持续黑暗，0L：24D或12L：12D，并在12L：12D，0L：24D和24L：0D体制下的6个月龄少年血浆中。幼虫中的高MEL浓度表明MEL在金黄色葡萄球菌的早期器官发生和发育中具有独特的作用。在幼虫中，胃肠道似乎是MEL的重要的视网膜外和视网膜外来源。在67天的幼虫中没有发现MEL合成的内源性节律。然而，在六个月的少年中，这是显而易见的。在金黄色葡萄球菌的早期致癌作用中，MEL的作用可能主要与控制发育和抵抗自由基有关，而其作为计时分子的作用则在稍后发展。在金黄色葡萄球菌幼虫-幼体过渡期间，即孵化后50至70天之间，T4浓度的增加与MEL浓度的降低同时观察到，可能表明T4与MEL之间呈反比关系。

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