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Regulation of cholesterol ester synthesis in cultured glial and neuronal cells
Abstract
Regulation of cholesterol ester synthesis was studied in cultured C-6 glial and neuroblastoma cells. Particular emphasis was placed on the relation of this regulation to control of cholesterol synthesis. The effectors studied were low density lipoprotein (LDL) and desmosterol. Distinct differences in regulation were observed between the glial and neuronal cells. In the neuronal cells cholesterol ester synthesis (from [14C]oleate) was not affected by even high concentrations of LDL or desmosterol. In contrast, cholesterol ester synthesis was stimulated as much as 12-fold in the glial cells after just 5 h exposure to LDL or desmosterol. Cholesterol synthesis (from [14C]acetate) was inhibited in a simultaneous and quantitatively similar manner. Suitable experiments indicated that alterations in pool sizes of intermediates did not contribute to the genesis of the observed responses and suggested that LDL and desmosterol produced their effects by stimulating esterification of primarily endogenous cholesterol. The data may have major implications concerning the controlling metabolic events prior to and at the onset of myelination.
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Astrocytes possess an apo (B, E) receptor that provides a regulated mechanism for supplying cells with cholesterol.
“Like other cells in the body, astrocytes possess an apo (B, E) receptor, and at the cellular level, this receptor provides a regulated mechanism for supplying cells with cholesterol (Volpe et al., 1978; Pitas et al., 1987).”
From Upregulation of the low density lipoprotein receptor at the blood-brain barrier: intercommunications between brain capillary endothelial cells and astrocytes. (1994) · cites this paper as Volpe et al., 1978
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Cited by
Sorted by citations
Astrocytes synthesize apolipoprotein E and metabolize apolipoprotein E-containing lipoproteins
Pitas, R. E., Boyles, J. K., Lee, S. H., Foss, D., & Mahley, R. W. (1987) · Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism · doi:10.1016/0005-2760(87)90295-5 · Cited by 693
Dehouck, B., Dehouck, M. P., Fruchart, J. C., & Cecchelli, R. (1994) · The Journal of cell biology · doi:10.1083/jcb.126.2.465 · Cited by 240
Metadata
- Authors
- Volpe, J. J., Hennessy, S. W., & Wong, T.
- Venue
- Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism
- Publisher
- Elsevier BV
- Published
- 1978-03
- Volume
- 528
- Issue
- 3
- Pages
- 424-435
- ISSN
- 0005-2760
- Cited by
- 19
- References
- 0
- Language
- en
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