Lipid-stimulated somatostatin secretion in rainbow trout,Oncorhynchus mykiss |
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| Authors: | Nancy M Carneiro Carmen D Eilertson Dr Mark A Sheridan |
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| Institution: | (1) Department of Zoology, North Dakota State University, 58105 Fargo, ND, USA;(2) Present address: Instituto de Biociencias, Deparatmento de Fisiologio, Universidade de São Paulo, 05508-900 São Paulo, Brasil;(3) Present address: Department of Anatomy and Cell Biology, Emory University School of Medicine, 30322 Atlanta, GA, USA |
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| Abstract: | Previous work has shown that somatostatins (SS) affect teleost lipid metabolism indirectly by inhibition of insulin (INS) and directly by stimulation of hepatic lipolysis. In the present study, rainbow trout (Oncorhynchus mykiss) were used to characterize further the lipid-SS relationship by evaluating how lipid, contributes to SS secretion bothin vivo andin vitro. In vivo hyperlipidemia was induced for up to 3 h by short-term (2 min) infusion of a triacylglycerol (TG)-rich lipid emulsion (20% Intralipid®). Plasma total lipid concentration increased 118 and 155% over control levels 1 h and 3 h, respectively, after infusion; much of this increase was due to elevated plasma fatty acids (FA), which increased 39 and 520%, respectively, over the same time-frame. The hyperlipidemic pattern was attended by a significant increase in the plasma concentration of SS. The specific effects of fatty acids were evaluated on isolated Brockmann bodies. Palmitic acid and oleic acid stimulated SS release 378 and 82%, respectively, over baseline levels. These results indicate that lipids, and in particular fatty acids, modulate SS secretion in rainbow trout. |
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| Keywords: | hyperlipidemia fatty acids somatostatin rainbow trout Oncorhynchus mykiss |
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