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mediates the lipolytic effects of dietary fish oil to reduce body fat deposition1Y. H. Yu*, P. H. Wang*, W. T. K. Cheng
, H. J. Mersmann*,2, S. C. Wu*,3 and S. T. Ding*,3 [size=-1]* Department of Animal Science and Technology/Institute of Biotechnology, National Taiwan University, Taipei 106, Taiwan; and Department of Animal Science and Biotechnology, Tunghai University, Taichung 407, Taiwan [size=-1]3 Corresponding authors: sding@ntu.edu.tw and scw01@ntu.edu.tw Peroxisome proliferator-activated receptor 
promotes fatty acid catabolism and energy expenditure in skeletal muscle and adipose tissues. A ligand for PPAR is required to activate PPAR function. Polyunsaturated fatty acids are potential ligands for PPAR activation. The current experiment was designed to determine the potential for PUFA, particularly from dietary fish oil, to activate porcine PPAR in vivo. Transgenic mice were generated to overexpress porcine PPAR in the adipose tissue. Mice were fed a high-saturated fat (13% beef tallow), or high-unsaturated fat (13% fish oil) diet, or a diet containing 4 mg/kg of a PPAR ligand (L165041) for 4 mo. Compared with beef tallow feeding, fish oil feeding reduced fat mass and decreased (P < 0.05) plasma triacylglycerol and FFA concentrations in the transgenic mice. Adipose tissue expression of genes involved in adipogenesis (i.e., lipoprotein lipase and adipocyte fatty acid-binding protein) was decreased in transgenic mice fed fish oil or the PPAR ligand. In the same mice, expression of the lipolytic gene, hormone-sensitive lipase was increased (P < 0.05). Fish oil feeding also stimulated expression of genes participating in fatty acid oxidation in the liver of transgenic mice compared with wild-type mice. Overall, these results indicate that PUFA may serve as natural and effective regulators of lipid catabolism in vivo and many of these effects may be generated from activation of PPAR. Key Words: adipose tissue • fish oil • lipid metabolism • peroxisome proliferator-activated receptor • pig • polyunsaturated fatty acid| 歡迎光臨 畜牧人 (http://www.www12347.com/) | Powered by Discuz! X3.5 |