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Eighteen-month-old Nebraska strain minipigs were fed diets containing 2% cholesterol and 20% corn oil, lard, or coconut oil for 12 to 18 months. Concentrations of serum total lipid, total cholesterol, and total phospholipid increased 200 to 300% with each diet. Changes in serum concentrations of Sf 20+ and Sf 0-20 lipoproteins varied with diets fed. Serum concentration of high density lipoprotein was increased in all cases. Intima concentration of Sf 0-20 lipoprotein fraction was elevated by feeding the corn oil diet. There was no development of atherosclerosis as a result of feeding the corn oil-cholesterol diet, but there was an increase in atherosclerosis as a result of feeding the lard or coconut oil diet. There were no correlations between fatty acid patterns of several lipid fractions from serum and corresponding lipid fractions from aortic intima of corn oil fed animals.

Two products derived from rat renal tissue have been shown to affect in vitro hepatic cholesterol synthesis. A premevalonate inhibitor of hepatic cholesterol synthesis is associated with the membranes of the renal endoplasmic reticulum. It is stable at −75 C and at 4 C but is heat labile. A pre‐mevalonate stimulator of in vitro hepatic cholesterol synthesis is located within renal lysosomes and can be prepared in a nonsedimentable form by extraction with hypotonic buffer. While it is stable at −75 C, it loses activity at 4 C. Both of these products appear to have a molecular weight in excess of 150,000 as determined by gel filtration.

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