Abstract
Partial ileal bypass (PIB) surgery was performed in hypercholesterolaemic mini-pigs and Yorkshire pigs fed a semipurified diet containing 1% (W/W) of cholesterol. PIB drastically reduced serum total cholesterol and phospholipid concentrations and the cholesterol: phospholipid ratio in spite of continuation of cholesterol feeding. The relative distribution of cholesterol between serum lipoproteins was affected by PIB; the surgical treatment caused an increase in the ratio of high-density lipoprotein (HDL) to low-density lipoprotein (LDL) cholesterol. Serum apo B and apo A levels were rapidly decreased by PIB. The operation induced a decrease in the cholesterol: apo B and cholesterol: apo A ratios. It is suggested that the pig is a suitable animal model to study PIB-induced changes in lipoprotein metabolism.
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