A possible regulatory role of squalene epoxidase in chinese hamster ovary cells |
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Authors: | Haviva Eilenberg Ishaiahu Shechter |
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Affiliation: | (1) Department of Biochemistry, The George S. Wise Faculty of Life Sciences, Tel Aviv University, 69978 Tel Aviv, Israel |
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Abstract: | Growth of Chinese Hamster Ovary (CHO) cells in the presence of 20% lipid depleted serum (LDS) for only 2 hr results in an
increase in the synthesis of 14C] sterols from 14C] mevalonate and from 14C] squalene compared with cells grown under normal growth conditions in the presence of 10% fetal calf serum (FCS). This enhanced
sterol synthesis increases with time of exposure of the cells to LDS. However, exposing these cells for time periods up to
42.5 hr to a growth medium containing 20% LDS did not result in enhanced 14C] sterol synthesis from 14C] 2,3-oxidosqualene. Incubation of these cells with 14C] mevalonate resulted in the accumulation of 14C] squalene regardless of the presence of either LDS or FCS. These results suggest that squalene epoxidase is a regulatory
enzyme in the cholesterol biosynthetic pathway in CHO.
This research was supported by Grant 1426 from the Council for Tobacco Research-USA, Inc. |
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