Antarctic fish tissues preferentially catabolize monoenoic fatty acids

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Authors:Sidell, B. D.; Crockett, E. L.; Driedzic, W. R.
Main Author Affiliation:Sidell, B. D., Department of Zoology and Center for Marine Studies, University of Maine, Orono, Maine 04469-5751
Volume Title:Journal of experimental zoology
Source:Journal of experimental zoology. 271(2). United States. P.73-81
Publication Date:1995
Note:39 refs. Ant. Acc. No: 52825
Abstract:In vitro measurements were made of the rates of oxidation of 14C-labeled carbohydrates and fatty acids by oxidative skeletal muscle and heart ventricle of an antarctic teleost, Gobionotothen gibberifrons to assess the relative importance of these substrates to aerobic energy metabolism. Capacities for regeneration of ATP calculated from oxidation rates of these fuels clearly indicate that fatty acids are more effective substrates of energy metabolism than either glucose or lactate with both tissues. Substrate competition experiments conducted between the saturated fatty acid palmitate (16:1) and the monoenoic unsaturate oleate (18:1) comparing the oxidation rate of radio-labeled fatty acid in the presence and absence of unlabeled competitor demonstrate a clear preference of both tissue types for catabolism of the monounsaturated substrate. The general pattern of results suggests that monounsaturated fatty compounds are the most readily utilized substrates for energy metabolism by oxidative muscle tissues of this antarctic species. (Auth. mod.)
Index Terms:Pisces--Physiology; Pisces--Morphology; Biochemistry; Antarctica--East Antarctica; Antarctica--Low Island; Antarctica--Dallmann Bay
Coordinates:S900000 S650000 E1710000 W0400000
Publication Type:journal article
Record ID:189056
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