Assays of plasma dehydrocholesteryl esters and oxysterols from Smith-Lemli-Opitz syndrome patients

Smith-Lemli-Opitz syndrome (SLOS) is caused by mutations in the gene encoding 3β-hydroxysterol-Δ7-reductase and as a result of this defect, 7-dehydrocholesterol (7-DHC) and 8-dehydrocholesterol (8-DHC) accumulate in the fluids and tissues of patients with this syndrome. Both 7- and 8-DHC are suscept...

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Main Authors: Liu, Wei (Author) , Xu, Libin (Author) , Lamberson, Connor R. (Author) , Merkens, Louise S. (Author) , Steiner, Robert D. (Author) , Elias, Ellen R. (Author) , Haas, Dorothea (Author) , Porter, Ned A. (Author)
Format: Article (Journal)
Language:English
Published: 2013
In: Journal of lipid research
Year: 2021, Volume: 54, Issue: 1, Pages: 244-253
ISSN:1539-7262
DOI:10.1194/jlr.M031732
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1194/jlr.M031732
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0022227520417791
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Author Notes:Wei Liu, Libin Xu, Connor R. Lamberson, Louise S. Merkens, Robert D. Steiner, Ellen R. Elias, Dorothea Haas, and Ned A. Porter

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520 |a Smith-Lemli-Opitz syndrome (SLOS) is caused by mutations in the gene encoding 3β-hydroxysterol-Δ7-reductase and as a result of this defect, 7-dehydrocholesterol (7-DHC) and 8-dehydrocholesterol (8-DHC) accumulate in the fluids and tissues of patients with this syndrome. Both 7- and 8-DHC are susceptible to peroxidation reactions, and several biologically active DHC oxysterols are found in cell and animal models of SLOS. Ex vivo oxidation of DHCs can be a confounding factor in the analysis of these sterols and their esters, and we developed HPLC/MS methods that permit the direct analysis of cholesterol, 7-DHC, 8-DHC, and their esters in human plasma, thus avoiding ex vivo oxidation. In addition, three oxysterols were classified as endogenously formed products by the use of an isotopically-labeled 7-DHC (d7-7-DHC) added to the sample before workup, followed by MS analysis of products formed. Analysis of 17 SLOS plasma samples shows that 8-DHC linoleate correlates better with the SLOS severity score of the patients than other sterols or metabolites, including cholesterol and 7-DHC. Levels of 7-ketocholesterol also correlate with the SLOS severity score. 8-DHC esters should have utility as surrogate markers of severity in SLOS for prognostication and as endpoints in clinical trials. 
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650 4 |a 7-dehydrocholesterol 
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650 4 |a lipid peroxidation 
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650 4 |a sterol ester 
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