Nutritional and hormonal control of lipolysis in isolated gilthead seabream (Sparus aurata) adipocytes
2005
Albalat, A. | Gomez-Réqueni, P. | Rojas, P. | Médale, Françoise | Kaushik, Sadasivam, S. | Vianen, G.J. | van den Thillart, G. | Gutíerrez, J. | Perez-Sanchez, J. | Navarro, Isabelle | Universitat de Barcelona (UB) | Institute of Aquaculture Torre la Sal (IATS) | Nutrition, Aquaculture et Génomique (NUAGE) ; Institut National de la Recherche Agronomique (INRA)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) | Universiteit Leiden = Leiden University
International audience
اظهر المزيد [+] اقل [-]إنجليزي. We examined the effects of diet composition and fasting on lipolysis of freshly isolated adipocytes from gilthead seabream (Sparus aurata). We also analyzed the effects of insulin, glucagon, and growth hormone (GH) in adipocytes isolated from fish fed with different diets. Basal lipolysis, measured as glycerol release, increased proportionally with cell concentration and time of incubation, which validates the suitability of these cell preparations for the study of hormonal regulation of this metabolic process. Gilthead seabream were fed two different diets, FM (100% of fish meal) and PP (100% of plant protein supplied by plant sources) for 6 wk. After this period, each diet group was divided into two groups: fed and fasted (for 11 days). Lipolysis was significantly higher in adipocytes from PP-fed fish than in adipocytes from FM-fed fish. Fasting provoked a significant increase in the lipolytic rate, about threefold in isolated adipocytes regardless of nutritional history. Hormone effects were similar in the different groups: glucagon increased the lipolytic rate, whereas insulin had almost no effect. GH was clearly lipolytic, although the relative increase in glycerol over control was lower in isolated adipocytes from fasted fish compared with fed fish. Together, we demonstrate for the first time that lipolysis, measured in isolated seabream adipocytes, is affected by the nutritional state of the fish. Furthermore, our data suggest that glucagon and especially GH play a major role in the control of adipocyte lipolysis.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique