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- Title
Effect of Simvastatin on markers of triglyceride-rich lipoproteins in familial hypercholesterolaemia.
- Authors
Dane-Stewart, C. A.; Watts, G. F.; Mamo, J. C. L.; Barrett, P. H. R.; Martins, I. J.; Dimmitt, S. B.; Redgrave, T. G.
- Abstract
Abstract Background We have previously shown elevated fasting plasma concentrations of intestinal remnants, as reflected by apolipoprotein (apo) B-48 and remnant-like particle-cholesterol (RLP-C) in patients with heterozygous familial hypercholesterolaemia (FH). We now investigate the effect of an HMG-CoA reductase inhibitor (simvastatin) on chylomicron remnant metabolism using the measurement of fasting apoB-48 and RLP-C in FH patients after long- and short-term simvastatin therapy and after a wash-out period. We also piloted the response of a breath test, involving the measurement of the fractional catabolic rate (FCR) of an intravenously injected chylomicron remnant-like emulsion labeled with cholesteryl 13 C-oleate. Methods Fifteen FH patients were studied after > 6 months 40 mg day-1 simvastatin treatment (long-term), a wash-out period (4 weeks), and 4 weeks of simvastatin treatment (short-term). Apolipoprotein B-48 was determined by SDS-PAGE and Western blotting/enhanced chemiluminescence and RLP-C by an immunoseparation assay. The FCR of the chylomicron remnant-like emulsion was determined from the appearance of 13 CO2 in the breath and by multicompartmental mathematical modelling. Results Both long- and short-term treatment with simvastatin were associated with decreases in the plasma concentration of apoB-48 (P < 0·05) and RLP-C ( P < 0·001), but there was no significant change in the FCR of the emulsion. Conclusions We suggest that long- and short-term treatments with simvastatin have comparable effects in decreasing the plasma concentration of triglyceride-rich remnants in heterozygous FH, as measured by fasting apoB-48 and RLP-C. The mechanisms for this may involve decreased production of hepatic and possibly intestinal lipoproteins, and/or up-regulation of hepatic receptor clearance pathways, but these changes are apparently not associated with a change in remnant clearance as measured...
- Subjects
BLOOD plasma; APOLIPOPROTEINS; HYPERCHOLESTEREMIA
- Publication
European Journal of Clinical Investigation, 2002, Vol 32, Issue 7, p493
- ISSN
0014-2972
- Publication type
Article
- DOI
10.1046/j.1365-2362.2002.01012.x