A B S T R A C T Six adult pedigreed dogs were studied as long as 3 yr in order to determine the effects of cholesterol feeding and of bile diversion on absorption, synthesis, and storage of cholesterol. These measurements were based on cholesterol balance and isotope kinetic studies.In the six dogs fed a "cholesterol-free" diet with their enterohepatic circulations undisturbed, the rate of cholesterol synthesis ranged from 225 to 508 mg/day (mean 325 mg/day or 12.4 mg/kg/day). In two dogs studied subsequently on cholesterol-containing diets, absorption of cholesterol averaged 81% (range 71-94%) on a dietary intake of 0.5 g/day; on high cholesterol intakes (2.7-3.0 g/day) the rate of absorption dropped to 43-51% of daily intake, but the absolute amounts absorbed were increased. Feeding of cholesterol resulted in acceleration of bile acid formation and excretion, as well as nearly total inhibition of cholesterol synthesis. These two compensatory mechanisms were sufficient to maintain zero balance of cholesterol in the face of a high cholesterol intake. Plasma cholesterol concentrations in the two dogs increased by 37 and 44%.In two other dogs bile was completely diverted into the urinary system for nearly 2 yr. When these dogs were studied on a cholesterol-free diet, the sum of acidic steroids excreted daily in urine plus neutral steroids excreted in feces was seven times as high as before the operation. Since these massive excretory losses could not Dr. Pertsemlidis and Dr. Kirchman's present address is
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