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首页> 外文期刊>Marine biology >Actions of 17 β-estradiol on carbohydrate metabolism in liver, gills, and brain of gilthead sea bream Sparus auratus during acclimation to different salinities
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Actions of 17 β-estradiol on carbohydrate metabolism in liver, gills, and brain of gilthead sea bream Sparus auratus during acclimation to different salinities

机译：17β-雌二醇对适应不同盐度的金头鲷鲷鱼肝脏，g和大脑中碳水化合物代谢的作用

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摘要

The influence of gonadal maturation on sea-water adaptability at the metabolic level was assessed in the euryhaline teleost Sparus auratus by treatment of immature fish with 17β-estradiol (E_2) followed by acclimation to different environmental salinities. Fish were injected with coconut oil alone (sham) or containing E_2 (10 μg g~(-1) body weight) and maintained in seawater (40 per thousand). After 5 days, fish from oil- and E_2-implanted groups were sampled. At the same time, fish of both groups were transferred to brackish water (5 per thousand, hypoosmotic test), seawater (40 per thousand, transfer test), and hypersaline water (55 per thousand, hyperosmotic test); 4 days after transfer (9 days post-implant) all groups were sampled. Data obtained from liver suggest that E_2 treatment produced effects comparable to those already reported in literature, including decreased glycogen levels, increased glycolytic potential, and decreased gluconeogenic potential. This, together with the fact that many changes displayed in shams among salinities disappeared in E_2-treated fish allow us to suggest that the response of liver carbohydrate metabolism to osmotic acclimation is exceeded by the response elicited by E_2 treatment. In gills, E_2 treatment produced increased lactate levels, decreased capacity for use of exogenous glucose, and decreased the potential of the pentose phosphate pathway. These findings suggest that the energy demand occurring in gills during osmotic acclimation should be increasingly fuelled by substrates other than exogenous glucose. Finally, data obtained in brain of E_2-treated fish suggest a lower necessity of exogenous glucose, increased lactate levels, and decreased glycolytic potential.
机译：通过用17β-雌二醇（E_2）处理未成熟鱼，然后适应不同的环境盐度，来评估鱼腥草硬骨鱼（Spaus auratus）在代谢水平上性腺成熟对海水适应性的影响。鱼只注射椰子油（假）或含有E_2（体重为10μg〜（-1）），并保持在海水中（每千只40）。 5天后，从油和E_2植入组中取样。同时，将两组鱼分别转移至微咸水（每千次渗透测试，每5份），海水（每千份，转移测试，每份40克）和高盐度水（每千份，渗透测试，每份55克）；转移后4天（植入后9天）取样所有组。从肝脏获得的数据表明，E_2治疗产生的效果与文献中已报道的效果相当，包括糖原水平降低，糖酵解潜力增加和糖原异生能力降低。这与E_2处理的鱼的盐分中盐分中显示的许多变化消失的事实一起，使我们提出E_2处理引起的响应超出了肝脏碳水化合物代谢对渗透性适应的响应。在g中，E_2处理可提高乳酸水平，降低利用外源葡萄糖的能力，并降低戊糖磷酸途径的潜力。这些发现表明，在渗透适应过程中，g中发生的能量需求应通过外源葡萄糖以外的其他底物来增加。最后，从用E_2处理的鱼的大脑中获得的数据表明，外源葡萄糖的需求降低，乳酸水平升高，糖酵解潜力降低。

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