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High-Glucose Feeding of Gilthead Seabream (Sparus Aurata) Larvae: Effects on Molecular and Metabolic Pathways

Abstract : Nutritional programming has begun to arouse interest as a novel tool to alter specific metabolic pathways or functions in farmed animals. The aim of the present study was to explore the potential of early glucose stimuli to induce changes in nutrient metabolism of gilthead seabream. Nutritional conditioning was performed by delivering glucose-rich feed at three distinct recurrent periods of larval feeding regime: during first-feeding with rotifers (3 days after hatching, DAH) and mid-feedingwith Artemiametanauplii (20DAH) and the beginning of inert diet feeding (30DAH), called the Recurrent treatment (REC). As opposed, the control treatment (CTRL) did not experience any glucose stimuli. At post-larval stage (from 50 to 60DAH), both treatments were challenged with a high-carbohydrate diet (50%). The immediate response to the early stimuli was assessed through gene expression of metabolic markers and by nutrient metabolismusing [14C] tracers. Each dietary stimulus induced metabolic changes on REC larvae, shown by altered expression of some genes, including those involved in glycolysis, and by a different pattern of glucose utilization. However, none of the molecular adaptations (except G6PDH gene) were persistent in the viscera and muscle of challenged post-larvae from REC group. In contrast, the glucose metabolism of challenged REC post-larvae revealed a shift towards a higher catabolism and lower glucose retention in tissues, compared to the CTRL group, suggesting an improvement of glucose oxidation pathways. In addition, the REC group showed a higher bio-conversion of glucose into lipids, indicating enhanced hepatic lipogenesis. The early stimuli did not affect the relative retention or use of amino acids or the growth and survival of challenged fish, up to 60DAH. In summary, although not substantiated at a molecular level, our data reveal that a recurrent high-glucose stimulus during larval stages affects the shortterm modulation of pathways for glucose utilization in gilthead seabream
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Submitted on : Saturday, May 25, 2019 - 10:21:59 AM
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Filipa Rocha, Jorge Dias, Inge Geurden, Maria Teresa Dinis, Stéphane Panserat, et al.. High-Glucose Feeding of Gilthead Seabream (Sparus Aurata) Larvae: Effects on Molecular and Metabolic Pathways. Aquaculture, Elsevier, 2016, 451, pp.241-253. ⟨10.1016/j.aquaculture.2015.09.015⟩. ⟨hal-02139690⟩



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