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  • Vehmas, A. P., et al. (författare)
  • Liver lipid metabolism is altered by increased circulating estrogen to androgen ratio in male mouse
  • 2016
  • Ingår i: Journal of Proteomics. - : Elsevier BV. - 1874-3919. ; 133, s. 66-75
  • Tidskriftsartikel (refereegranskat)abstract
    • Estrogens are suggested to lower the risk of developing metabolic syndrome in both sexes. In this study, we investigated how the increased circulating estrogen-to-androgen ratio (E/A) alters liver lipid metabolism in males. The cytochrome P450 aromatase (P450arom) is an enzyme converting androgens to estrogens. Male mice overexpressing human aromatase enzyme (AROM + mice), and thus have high circulating E/A, were used as a model in this study. Proteomics and gene expression analyses indicated an increase in the peroxisomal beta-oxidation in the liver of AROM + mice as compared with their wild type littermates. Correspondingly, metabolomic analysis revealed a decrease in the amount of phosphatidylcholines with long-chain fatty acids in the plasma. With interest we noted that the expression of Cyp4a12a enzyme, which specifically metabolizes arachidonic acid (AA) to 20-hydroxy AA, was dramatically decreased in the AROM + liver. As a consequence, increased amounts of phospholipids having AA as a fatty acid tail were detected in the plasma of the AROM + mice. Overall, these observations demonstrate that high circulating E/A in males is linked to indicators of higher peroxisomal beta-oxidation and lower AA metabolism in the liver. Furthermore, the plasma phospholipid profile reflects the changes in the liver lipid metabolism. (C) 2015 Elsevier B.V. All rights reserved.
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