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Asian-Australas J Anim Sci > Volume 24(9); 2011 > Article
Poultry and Laboratory Animal Nutrition
Asian-Australasian Journal of Animal Sciences 2011;24(9): 1274-1281.
DOI: https://doi.org/10.5713/ajas.2011.10430    Published online August 24, 2011.
Dietary Protein Restriction Alters Lipid Metabolism and Insulin Sensitivity in Rats
W. Kang, M. S. Lee, M. Baik
Abstract
Dietary protein restriction affects lipid metabolism in rats. This study was performed to determine the effect of a low protein diet on hepatic lipid metabolism and insulin sensitivity in growing male rats. Growing rats were fed either a control 20% protein diet or an 8% low protein diet. Feeding a low protein diet for four weeks from 8 weeks of age induced a fatty liver. Expression of acetyl-CoA carboxylase, a key lipogenic enzyme, was increased in rats fed a low protein diet. Feeding a low protein diet decreased very low density lipoprotein (VLDL) secretion without statistical significance. Feeding a low protein diet down-regulated protein expression of microsomal triglyceride transfer protein, an important enzyme of VLDL secretion. Feeding a low protein diet increased serum adiponectin levels. We performed glucose tolerance test (GTT) and insulin tolerance test (ITT). Both GTT and ITT were increased in protein-restricted growing rats. Our results demonstrate that dietary protein restriction increases insulin sensitivity and that this could be due to low-protein diet-mediated metabolic adaptation. In addition, increased adiponectin levels may influences insulin sensitivity. In conclusion, dietary protein restriction induces a fatty liver. Both increased lipogenesis and decreased VLDL secretion has contributed to this metabolic changes. In addition, insulin resistance was not associated with fatty liver induced by protein restriction.
Keywords: Dietary Protein Restriction; Fatty Liver; Lipid Metabolism; Insulin Sensitivity


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