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Journal of Lipid Research, Vol 38, 2264-2272, Copyright © 1997 by Lipid Research, Inc.
AE Christian, MP Haynes, MC Phillips and GH Rothblat
Previous studies from this laboratory have demonstrated that exposure of
tissue culture cells to cyclodextrins results in rapid cholesterol
depletion. In the present study, we have developed experimental systems for
using solutions of cyclodextrins, either 2-hydroxypropyl beta- cyclodextrin
or methylated beta-cyclodextrin, complexed with varying amounts of free
cholesterol to manipulate cell cholesterol content. Cholesterol delivered
via the cyclodextrin has been found to be metabolically active, as measured
by the acyl-coenzyme A:cholesterol acyltransferase (ACAT)-mediated
esterification of [3H]cholesterol in Fu5AH rat hepatoma cells and Chinese
hamster ovary cells. The methylated beta-cyclodextrin was found to be a
more efficient donor in all cell types studied, with an average cholesterol
uptake of at least 100 microg cholesterol/mg protein within 6 h. By
modifying the cyclodextrin:cholesterol molar ratio, it is possible to
manipulate the cellular cholesterol content of cells, producing conditions
ranging from net cholesterol enrichment to depletion. The use of
cyclodextrins provides a convenient, precise and reproducible method for
modulating the cholesterol content of tissue culture cells.
ARTICLES
Use of cyclodextrins for manipulating cellular cholesterol content
Department of Biochemistry, Allegheny University of the Health Sciences, Philadelphia, PA 19129, USA.
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