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Effects of nonesterified fatty acids on the synthesis and assembly of very low density lipoprotein in bovine hepatocytes in vitro.

J. Dairy Sci.2014 Mar;97(3):1328-35. Epub 2013 Dec 28
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摘要


High serum concentrations of nonesterified fatty acids (NEFA), which may affect the synthesis and assembly of very low density lipoproteins (VLDL), are associated with fatty liver during the early lactation period. Therefore, the objective of this study was to investigate the effects of NEFA on the synthesis and assembly of VLDL in bovine hepatocytes. Bovine hepatocytes were cultured and treated with different concentrations of NEFA. The mRNA expression of apolipoprotein B100 (ApoB100) and apolipoprotein E (ApoE) was significantly lower in the NEFA treatment groups than in the control group (0mM NEFA). The abundance of mRNA from microsomal triglyceride transfer protein (MTP) and the low density lipoprotein receptor (LDLR) was significantly lower in the medium- and high-dose NEFA treatment groups. The protein expression of ApoB100, ApoE, MTP, and LDLR was found to be significantly and dose-dependently decreased in groups of NEFA-treated hepatocytes. The VLDL content was also significantly decreased in the NEFA-treated hepatocytes. Large amounts of triglycerides accumulated in the hepatocytes. These results indicate that NEFA significantly inhibits the expression of ApoB100, ApoE, MTP, and LDLR, thereby decreasing the synthesis and assembly of VLDL and inducing TG accumulation in bovine hepatocytes.

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