Sprague-Dawley male rats from the Ivanovas-Sieve colony (IVA-SIV) show higher plasma triglyceride levels compared to the standard Charles River (CR) rats. The triglyceride enrichment occurs primarily in the very-low-density lipoproteins (VLDL), otherwise of a normal % composition, suggesting that the number of particles is increased, rather than their triglyceride (TG) content. High-density lipoprotein (HDL) particles, corresponding to HDL1, appear to be increased in the IVA-SIV rats, as confirmed by rate-zonal ultracentrifugation. The apoprotein composition of isolated lipoproteins (apo B content and isoelectric focusing pattern), does not differ in the two strains. The IVA-SIV rats are remarkably more TG inducible, compared to the standard CR. This can be shown with fructose loading and with a cholesterol-cholic acid diet. The plasma TG increase, after Triton administration, indicative of the VLDL-TG production, is fourfold higher in the IVA-SIV, compared to the CR rats. These findings provide evidence for some similarities between the IVA-SIV rat and human endogenous hypertriglyceridemia, and suggest an increased TG biosynthesis in this model.
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