Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/12302
Title: Expression of genes involved in lipid metabolism in the muscle of beef cattle fed soybean or rumen-protected fat, with or without monensin supplementation
Keywords: Ionophores
mRNA
Oilseeds
Peroxisome proliferator-activated receptor α (PPAR-α)
Sterol regulatory element-binding protein-1c (SREBP-1c)
Issue Date: Dec-2014
Publisher: American Society of Animal Science
Citation: OLIVEIRA, D. M. et al. Expression of genes involved in lipid metabolism in the muscle of beef cattle fed soybean or rumen-protected fat, with or without monensin supplementation. Journal of Animal Science, Champaign, v. 92, n. 12, p. 5426-5436, Dec. 2014.
Abstract: Degree of unsaturation of fatty acids, which is influenced by lipid source and level of metabolism in the rumen, is a major determinant in how dietary lipids affect genes that regulate beef marbling. A total of 28 Red Norte bulls with an initial live weight of 361 ± 32 kg (P > 0.05) were used in a completely randomized experimental design to analyze the expression of genes that are involved in lipid metabolism in the longissimus dorsi (LD) when diets contained soybean grain or rumen-protected fat, with or without monensin. Treatments were arranged as a 2 × 2 factorial, with 4 treatments and 7 replicates per treatment. Half of the animals that received soybean or rumen-protected fat were supplemented with 230 mg head−1 d−1 of monensin. Gene expression was analyzed by reverse-transcription quantitative PCR (RT-qPCR). Expression of sterol regulatory element-binding protein-1c (SREBP-1c) in the LD muscle was not affected by lipid source or monensin (P > 0.05). There was an interaction effect (P < 0.05) between lipid source and monensin for peroxisome proliferator-activated receptor α (PPAR-α) and stearoyl-CoA desaturase (SCD) expression, where greater gene expression was found in animals fed soybean plus monensin and the lower gene expression was found in animals fed rumen-protected fat plus monensin. Expression of lipoprotein lipase (LPL) and fatty acid-binding protein 4 (FABP4) were greater (P < 0.05) in the LD muscle of animals fed soybean. Monensin had no effect on LPL and FABP4 expression when soybean without monensin was fed, but when rumen-protected fat was fed, monensin increased LPL expression and decreased FABP4 expression (P < 0.05). Linoleic and arachidonic acids had negative correlations (P < 0.05) with the expression of PPAR-α, SCD, FABP4, and LPL genes. PPAR-α gene expression was not correlated with SREBP-1c but was positively correlated with SCD, FABP4, LPL, and glutathione peroxidase (GPX1) gene expression (P < 0.001). Lipid sources and monensin interact and alter the expression of PPAR-α, SCD, acetyl CoA carboxylase α (ACACA), LPL, FABP4, and GPX1. These changes in gene expression were most associated with arachidonic and α-linolenic acids and the ability of lipid sources and monensin to increase these fatty acids in tissues.
URI: https://academic.oup.com/jas/article-abstract/92/12/5426/4703265?redirectedFrom=fulltext
http://repositorio.ufla.br/jspui/handle/1/12302
Appears in Collections:DBI - Artigos publicados em periódicos
DQI - Artigos publicados em periódicos
DZO - Artigos publicados em periódicos

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