Abstract
When rabbit reticulocytes were incubated in normal blood plasma containing mevalonic acid-2-(14)C, radioactivity was incorporated into cholesterol, cholesteryl esters, and squalene in the cells. The squalene reached a steady level of radioactivity much more rapidly than did cholesterol. Rabbit reticulocytes which were labeled as a result of previous incubation with mevalonic acid-2-(14)C were incubated with normal autologous blood plasma. The specific activity of the cholesterol in the plasma rapidly became higher than that of the cells. This suggests that there is compartmentation of cholesterol in the reticulocyte and that a pool involved in exchange with plasma cholesterol has a specific activity which is much higher than the average for the whole cell.
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