Karuna, R; Park, R; Othman, A; Holleboom, A G; Motazacker, M M; Sutter, I; Kuivenhoven, J A; Rohrer, L; Matile, H; Hornemann, T; Stoffel, M; Rentsch, K M; von Eckardstein, Arnold (2011). Plasma levels of sphingosine-1-phosphate and apolipoprotein M in patients with monogenic disorders of HDL metabolism. Atherosclerosis, 219(2):855-863.
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BACKGROUND: Apolipoprotein M (apoM) has been identified as a specific sphingosine-1-phosphate (S1P) binding protein of HDL. OBJECTIVES AND METHODS: To investigate the in vivo effects of disturbed apoM or HDL metabolism we quantified S1P and apoM in plasmas of wild-type, apoM-knock-out, and apoM transgenic mice as well as 50 patients with seven different monogenic disorders of HDL metabolism and their 51 unaffected relatives. RESULTS: Compared to wild type mice, S1P plasma levels in apoM knock-out and apoM transgenic mice were decreased by 30% and increased by 270%, respectively. Compared to family controls, S1P and apoM levels in apoB-depleted plasma were significantly decreased by in average 34% and 12%, respectively, in heterozygous carriers of mutations in APOA1, LCAT or ABCA1, and by 70% and 48%, respectively, in carriers of two defective alleles in LCAT or ABCA1. Heterozygous mutations in CETP, SCARB1, LIPC, or LIPG did not significantly affect S1P or apoM concentrations. Albumin-corrected molar S1P-to-apoM ratios varied from 0.12 to 0.8 (median 0.3) and were not affected by any mutation. S1P levels in apoB-depleted plasma correlated significantly with HDL-cholesterol and less so with apoM both if apoA-I plasma concentrations were below the median. CONCLUSION: In the context of previous data, our findings can be explained by the existence of a specific apoM and S1P containing HDL subclass which contains a considerable molar excess of apoM over S1P and is critically determined by apoA-I up to a threshold concentration around the median found in a Caucasian population.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Institute of Clinical Chemistry
04 Faculty of Medicine > Center for Integrative Human Physiology
|DDC:||570 Life sciences; biology
610 Medicine & health
|Deposited On:||15 Jan 2012 11:13|
|Last Modified:||27 Nov 2013 17:43|
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