Abstract
The influence of dietary excess (5%) of L-cystine on rat plasma lipoproteins was examined. After only one week of cystine feeding, an increase in the plasma cholesterol level and a decrease in triglyceride levels were observed. The increase in cholesterol level became greater when the duration of cystine-enriched diet increased until eight weeks (+131% after eight weeks), but no further increase occurred between 8 and 20 weeks. This change was essentially due to the progressive increase in cholesterol levels in high density lipoproteins (HDL) and in lipoproteins isolated between 1.040 and 1.063 g/ml, i.e., certain low density lipoproteins (HDL2), and containing mainly apoE-rich lipoproteins (HDL1). The decrease in plasma triglycerides resulted from that of chylomicrons and very low density lipoproteins (VLDL). The effects observed after four or eight weeks of cystine feeding were maintained for eight weeks after replacing the cystine diet by the standard diet. Ingestion of the standard diet containing either cholestyramine (2%) or probucol (0.25%) following eight weeks of cystine feeding significantly decreased plasma cholesterol levels. It is concluded that cystine-fed rats are a useful tool of investigation for understanding mechanisms leading to increased plasma cholesterol level and for hypocholesterolemic drug trials.
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Abbreviations
- CETP:
-
cholesteryl ester transfer protein
- EDTA:
-
ethylenediamine tetraacetic acid
- HDL:
-
high density lipoprotein
- LCAT:
-
lecithin: cholesterol acyl transferase
- (V)LDL:
-
(very) low density lipoprotein
- MIA:
-
monoiodoacetamide
- PTU:
-
propylthiouracil
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Sérougne, C., Mathé, D. & Lutton, C. Induction of long-lasting hypercholesterolemia in the rat fed a cystine-enriched diet. Lipids 23, 930–936 (1988). https://doi.org/10.1007/BF02536339
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DOI: https://doi.org/10.1007/BF02536339