Journal
BRITISH JOURNAL OF NUTRITION
Volume 113, Issue 7, Pages 1069-1077Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0007114514004310
Keywords
Bama mini-pigs; Dietary protein; Gene expression; Lipid metabolism
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Funding
- National Basic Research Program of China [2012CB124704, 2013CB127305]
- National Nature Science Foundation of China [31372325]
- K.C. Wong Education Foundation (Hong Kong)
- Texas A&M AgriLife Research
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Skeletal muscle is a major site for the oxidation of fatty acids (FA) in mammals, including humans. Using a swine model, we tested the hypothesis that dietary protein intake regulates the expression of key genes for lipid metabolism in skeletal muscle. A total of ninety-six barrows (forty-eight pure-bred Bama mini-pigs (fatty genotype) and forty-eight Landrace pigs (lean genotype)) were fed from 5 weeks of age to market weight. Pigs of fatty or lean genotype were randomly assigned to one of two dietary treatments (low-or adequate-protein diet), with twenty-four individually fed pigs per treatment. Our data showed that dietary protein levels affected the expression of genes involved in the anabolism and catabolism of lipids in the longissimus dorsi and biceps femoris muscles in a genotype-dependent manner. Specifically, Bama mini-pigs had more intramuscular fat, SFA and MUFA, as well as elevated mRNA expression levels of lipogenic genes, compared with Landrace pigs. In contrast, Bama mini-pigs had lower mRNA expression levels of lipolytic genes than Landrace pigs fed an adequate-protein diet in the growing phase. These data are consistent with higher white-fat deposition in Bama mini-pigs than in Landrace pigs. In conclusion, adequate provision of dietary protein (amino acids) plays an important role in regulating the expression of key lipogenic genes, and the growth of white adipose tissue, in a genotype-and tissue-specific manner. These findings have important implications for developing novel dietary strategies in pig production.
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