Cited by 693Cholesterol and Lipid MetabolismAlzheimer's disease research and treatmentsLipoproteins and Cardiovascular Health

Astrocytes synthesize apolipoprotein E and metabolize apolipoprotein E-containing lipoproteins

Pitas, Robert E., Boyles, Janet K., Lee, Susan H., Foss, Donna, Mahley, Robert W.·1987·Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism

Abstract

We have previously demonstrated that astrocytes synthesize and secrete apolipoprotein E in situ. In the present work, primary cultures of rat brain astrocytes were used to study apolipoprotein E synthesis, secretion, and metabolism in vitro. The astrocytes in culture contained immunoreactive apolipoprotein E in the area of the Golgi apparatus. Incubation of the astrocytes with [35S]methionine resulted in the secretion of labeled immunoprecipitable apolipoprotein E, which constituted 1-3% of the total secreted proteins. The apolipoprotein E secreted in culture and the apolipoprotein E in rat brain extracts differed from serum apolipoprotein E in two respects: both had a slightly higher apparent molecular weight (approx. 36,000) and more acidic isoforms than serum apolipoprotein E. Sialylation of the newly secreted apolipoprotein accounted for the difference in both the apparent molecular weight and isoelectric focusing pattern of newly secreted apolipoprotein E and plasma apolipoprotein E. The astrocytes possessed apolipoprotein B,E(LDL) receptors capable of binding and internalizing apolipoprotein E-containing lipoproteins. The uptake of lipoproteins by the cells led to a reduction in the number of cell surface receptors and to the intracellular accumulation of cholesteryl esters. Since apolipoprotein E is present within the brain, and since brain cells can express apolipoprotein B,E(LDL) receptors, apolipoprotein E-containing lipoproteins may function to redistribute lipid and regulate cholesterol homeostasis within the brain.

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Crossref · 10.1016/0005-2760(87)90295-5

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Authors
Pitas, R. E., Boyles, J. K., Lee, S. H., Foss, D., & Mahley, R. W.
Affiliations
University of California, San Francisco (US)
Corresponding author
Pitas, Robert E.
Venue
Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism
Publisher
Elsevier BV
Published
1987-01
Volume
917
Issue
1
Pages
148-161
ISSN
0005-2760 (ISSN-L)
OpenAlex
W2067064610
Cited by
693
References
39
Citations by year
2026: 9 · 2025: 24 · 2024: 11 · 2023: 16 · 2022: 19 · 2021: 22 · 2020: 15 · 2019: 17 · 2018: 9 · 2017: 11 · 2016: 24 · 2015: 19 · 2014: 12 · 2013: 16 · 2012: 19
FWCI
10.53
Type
journal article
Language
en
Open access
closed
Locations
  • Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
Keywords
astrocytes, apolipoprotein E, sialylation, Golgi apparatus, cholesterol esters, cholesterol homeostasis, brain lipids
MeSH terms
Animals, Animals, Newborn, Apolipoproteins E, Astrocytes, Brain, Cells, Cultured, Female, Fetus, Fibroblasts, Humans, Immunoenzyme Techniques, Kinetics, Macrophages, Microscopy, Fluorescence, Molecular Weight, Pregnancy, Rats, Inbred Strains, Mice, Rats

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