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Proteomics and gene expression analyses of squalene-supplemented mice identify microsomal thioredoxin domain-containing protein 5 changes associated with hepatic steatosis.

J Proteomics. 2012 Dec 21;77:27-39. Epub 2012 Jul 11
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摘要


Squalene is an abundant hydrocarbon present in virgin olive oil. Previous studies showed that its administration decreased atherosclerosis and steatosis in male apoE-knock-out mice. To study its effects on microsomal proteins, 1g/kg/day of squalene was administered to those mice. After 10 weeks, hepatic fat content was assessed and protein extracts of microsomal enriched fractions from control and squalene-treated animals were analyzed by 2D-DIGE. Spots exhibiting significant differences were identified by peptide fingerprinting and MSMS analysis. Squalene administration modified the expression of thirty-one proteins involved in different metabolic functions and increased the levels of those involved in vesicle transport, protein folding and redox status. Only mRNA levels of 9 genes (Arg1, Atp5b, Cat, Hyou1, Nipsnap1, Pcca, Pcx, Pyroxd2, and Txndc5) paralleled these findings. No such mRNA changes were observed in wild-type mice receiving squalene. Thioredoxin domain-containing protein 5 (TXNDC5) protein and mRNA levels were significantly associated with hepatic fat content in apoE-ko mice. These results suggest that squalene action may be executed through a complex regulation of microsomal proteins, both at the mRNA and post-transcriptional levels and the presence of apoE may change the outcome. Txndc5 reflects the anti-steatotic properties of squalene and the sensitivity to lipid accumulation.

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