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Journal of Lipid Research, Vol. 10, 304-315, May 1969
The Rockefeller University, New York 10021
The total miscible pool of cholesterol in the body is determined largely by the interaction of cholesterol absorption and synthesis. In the present study we have examined the net effects of this interplay in one normal and five hypercholesteremic subjects when various amounts of cholesterol were made available for absorption. Feeding large amounts of cholesterol to the normocholesteremic patient caused an expansion of body pools by as much as 20 g before the amount of cholesterol re-excreted as fecal neutral steroids each day came into balance with the cholesterol absorbed from the diet. There was no detectable decrease in total body synthesis of cholesterol nor any increase in conversion of cholesterol into bile acids. However, feedback control of cholesterol synthesis was demonstrable when large quantities of plant sterols were fed: in the hypercholesteremic patients thus studied, the absorption of both endogenous and exogenous cholesterol was then greatly reduced, and a compensatory increase in synthesis occurred. Thus, the plant sterol experiments, but not the cholesterol feeding experiment, demonstrated that feedback control by dietary cholesterol does occur in man. That feedback control by dietary cholesterol is relatively unimportant in man seems to be due to the fact that in the metabolic "steady state" the absorption mechanism is essentially saturated by the large amounts of endogenous cholesterol available for reabsorption. These findings demonstrate that there are important differences between man and various laboratory animals in regard to the interaction of absorption and synthesis as factors controlling the size of tissue pools of cholesterol. Supplementary key words ßbeta;-sitosterol • plant sterols • feedback regulation • cholesterol feeding • cholesterol balance
Submitted on November 4, 1968
Copyright © 1969 by Lipid Research, Inc.
The interaction of cholesterol absorption and cholesterol synthesis in man
Accepted on February 20, 1969
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