Cited by 59Caveolin-1 and cellular processesCholesterol and Lipid MetabolismLipid Membrane Structure and Behavior

Caveolin-1 does not affect SR-BI-mediated cholesterol efflux or selective uptake of cholesteryl ester in two cell lines

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Wang, Libo, Connelly, Margery A., Ostermeyer, Anne G., Chen, Hsu-hsin, Williams, David L., Brown, Deborah A.·2003·Journal of Lipid Research

Abstract

Free cholesterol (FC) has been reported to efflux from cells through caveolae, which are 50-100 nm plasma membrane pits. The 22 kDa protein caveolin-1 is concentrated in caveolae and is required for their formation. The HDL scavenger receptor BI (SR-BI), which stimulates both FC efflux and selective uptake of HDL-derived cholesteryl ester (CE), has been reported to be concentrated in caveolae, suggesting that this localization facilitates flux of FC and CE across the membrane. However, we found that overexpression of caveolin-1 in Fischer rat thyroid (FRT) cells, which lack caveolin-1 and caveolae, or HEK 293 cells, which normally express very low levels of caveolin-1, did not affect FC efflux to HDL or liposomes. Transient expression of SR-B1 did not affect this result. Similarly, caveolin-1 expression did not affect selective uptake of CE from labeled HDL particles in FRT or HEK 293 cells transfected with SR-BI. We conclude that basal and SR-BI-stimulated FC efflux to HDL and liposomes and SR-BI-mediated selective uptake of HDL CE are not affected by caveolin-1 expression in HEK 293 or FRT cells.

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Crossref · 10.1194/jlr.m200449-jlr200

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Authors
Wang, L., Connelly, M. A., Ostermeyer, A. G., Chen, H.-H., Williams, D. L., & Brown, D. A.
Affiliations
Stony Brook University (US)
Corresponding author
Brown, Deborah A.
Venue
Journal of Lipid Research
Publisher
Elsevier BV
Published
2003-04
Volume
44
Issue
4
Pages
807-815
ISSN
0022-2275 (ISSN-L)
OpenAlex
W2145629533
Cited by
59
References
56
Citations by year
2025: 1 · 2023: 2 · 2021: 3 · 2020: 1 · 2018: 3 · 2016: 3 · 2014: 3 · 2013: 1
FWCI
2.67
Type
journal article
Language
en
Open access
Locations
  • Journal of Lipid Research (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Heart, Lung, and Blood Institute (HL 58012, R01HL058012)
  • National Institute of General Medical Sciences (R01GM047897, GM 47897)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Caveolin-1 and cellular processes
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
Keywords
caveolin-1, scavenger receptor class B type I, cholesteryl ester uptake, HDL cholesterol, caveolae, FRT cells, HEK293 cells, liposomes
MeSH terms
Animals, Cell Line, Cholesterol, Cholesterol Esters, Humans, Lipoproteins, HDL, Liposomes, Membrane Proteins, Receptors, Immunologic, Transfection, Receptors, Lipoprotein, CD36 Antigens, Caveolae, Caveolins, Receptors, Scavenger, Scavenger Receptors, Class B, Caveolin 1, Rats

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