PMID: 11932205Apr 5, 2002Paper

Prolonged dietary treatment with conjugated linoleic acid stimulates porcine muscle peroxisome proliferator activated receptor gamma and glutamine-fructose aminotransferase gene expression in vivo

Journal of Molecular Endocrinology
W J MeadusM E R Dugan

Abstract

Peroxisome proliferator activated receptors (PPARs) represent a family of DNA binding proteins that are activated by a variety of dietary and endogenous fatty acids. The PPAR proteins are expressed throughout the body and are the target of a variety of lipidaemic and insulin sensitizing drugs. Conjugated linoleic acid (CLA) is a collective name for octadecadienoic acid isomers with conjugated double bonds, which can also act as ligands for some of the PPAR family. To gain better understanding of the long-term effects of PPAR activation, CLA was fed at 11 g/kg of feed for 45 days to castrated male pigs (barrows). These barrows had a significant repartitioning of subcutaneous fat to lean tissue in the carcass: fat was reduced by 9 x 2% and lean muscle was increased by 3 x 5%, but intramuscular fat content was also increased by 14% (P<0 x 05). PPARgamma, glutamine-fructose aminotransferase (GFAT), adipocyte fatty acid binding protein (AFABP), but not PPARalpha mRNA levels were significantly increased (P<0 x 05) in the CLA-fed pigs. The increased expression of PPARgamma and AFABP indicates that CLA induced the development of preadipocytes from stromal-vascular (s-v) stem cells to promote intramuscular fat content. The increase in t...Continue Reading

Citations

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