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Cholesteryl ester metabolism in tissue culture cells: II. Source of accumulated esterified cholesterol in Fu5AH rat hepatoma cells

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Lipids

Abstract

Previous investigations had demonstrated that Fu5AH rat hepatoma cells accumulated large quantities of esterified cholesterol when grown in hyperlipemic rabbit serum. The present investigation has determined the sources of the cellular esterified cholesterol when the cells were grown in hyperlipemic serum. Cellular esterification of endogenous and exogenous free cholesterol contributed 10% and 30%, respectively. The remaining 60% of the accumulated cellular esterified cholesterol was derived from exogenous (serum) cholesteryl esters. Evidence for the hydrolysis of a portion of the incorporated esterified cholesterol is presented. A stimulation of free cholesterol incorporation and cellular esterification is elicited by hyperlipemic serum and serum lipoproteins when compared to normolipemic serum present at equivalent exogenous cholesterol concentrations. The effect of hyperlipemic serum is reduced by Tween-80 and Triton WR-1339. Comparative data on esterified cholesterol accumulation, free cholesterol incorporation, and cellular cholesterol esterification in Fu5-5 rat hepatoma cells, L-cells, and rabbit aortic medial cells are presented.

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Authors and Affiliations

  1. The Wistar Institute, 36th and Spruce Sts., 19104, Philadelphia, Pennsylvania

    G. H. Rothblat, L. Arbogast, D. Kritchevsky & M. Naftulin

Authors
  1. G. H. Rothblat
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  2. L. Arbogast
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  3. D. Kritchevsky
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  4. M. Naftulin
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Additional information

This work was done during the tenure as Established Investigator of the American Heart Association.

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Rothblat, G.H., Arbogast, L., Kritchevsky, D. et al. Cholesteryl ester metabolism in tissue culture cells: II. Source of accumulated esterified cholesterol in Fu5AH rat hepatoma cells. Lipids 11, 97–108 (1976). https://doi.org/10.1007/BF02532658

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  • DOI: https://doi.org/10.1007/BF02532658

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