Short-term administration of conjugated linoleic acid reduces liver triglyceride concentration and phosphatidate phosphohydrolase activity in OLETF rats

J Biochem Mol Biol. 2002 Sep 30;35(5):494-7. doi: 10.5483/bmbrep.2002.35.5.494.

Abstract

The present study explored the short-term effects of dietary conjugated-linoleic acid (CLA) on liver lipid metabolism in starved/refed Otsuka Long Evans Tokushima Fatty (OLETF) rats. Male OLETF rats (12 weeks old) were starved for 24 hours, then refed for 48 hours with either a CLA diet [7.5% CLA and 7.5% Safflower oil (SAF)] or a SAF control diet (15% SAF). The results demonstrated a 30% reduction of hepatic triglyceride (TG) concentration in the CLA group when compared to the control group. Liver cholesterol concentration was also 26% lower in the CLA fed rats. The activity of mitochondrial carnitine palmitoyltransferase, the rate-limiting enzyme of fatty acid oxidation, was moderately elevated by 1.2-fold in the livers of the CLA group when compared to the control. In contrast, phosphatidate phosphohydrolase, the rate-limiting enzyme for TG synthesis, was found to be 20% lower in the livers of the CLA-fed rats. Therefore, dietary CLA evidently lowers liver lipid concentrations through a reduced TG synthesis and enhanced fatty acid oxidation in starved/refed OLETF rats.

MeSH terms

  • Animals
  • Carnitine O-Palmitoyltransferase / metabolism
  • Diabetes Mellitus, Type 2 / therapy
  • Dietary Fats / pharmacology*
  • Disease Models, Animal
  • Food
  • Glucosephosphate Dehydrogenase / metabolism
  • Linoleic Acid / administration & dosage
  • Linoleic Acid / pharmacology*
  • Liver / enzymology
  • Liver / metabolism*
  • Malate Dehydrogenase / metabolism
  • Male
  • Phosphatidate Phosphatase / metabolism*
  • Rats
  • Rats, Inbred OLETF
  • Starvation
  • Triglycerides / metabolism*

Substances

  • Dietary Fats
  • Triglycerides
  • Linoleic Acid
  • Malate Dehydrogenase
  • Glucosephosphate Dehydrogenase
  • Carnitine O-Palmitoyltransferase
  • Phosphatidate Phosphatase