Cited by 133Cholesterol and Lipid MetabolismLipoproteins and Cardiovascular HealthLipid metabolism and disorders

Elevated Triglyceride Content Diminishes the Capacity of High Density Lipoprotein to Deliver Cholesteryl Esters via the Scavenger Receptor Class B Type I (SR-BI)

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Greene, Diane J., Skeggs, Josephine W., Morton, Richard E.·2001·Journal of Biological Chemistry

Abstract

The selective uptake of high density lipoprotein (HDL) cholesteryl ester (CE) by the scavenger receptor class B type I (SR-BI) is well documented. However, the effect of altered HDL composition, such as occurs in hyperlipidemia, on this important process is not known. This study investigated the impact of variable CE and triglyceride (TG) content on selective uptake. CE selective uptake by Y1 and HepG2 cells was strongly affected by modification of either the CE or TG content of HDL. Importantly, TG, like CE, was selectively taken up by a dose-dependent, saturable process in these cells. As shown by ACTH up-regulation and receptor overexpression experiments, SR-BI mediated the selective uptake of both CE and TG. With in vitro modified HDLs of varying CE and TG composition, the selective uptake of CE and TG was dependent on the abundance of each lipid within the HDL particle. Furthermore, total selective uptake (CE + TG) remained constant, indicating that these lipids competed for cellular uptake. These data support a novel mechanism whereby SR-BI binds HDL and mediates the incorporation of a nonspecific portion of the HDL lipid core. In this way, TG directly affects the ability of HDL to donate CE to cells. Processes that raise the TG/CE ratio of HDL will impair the delivery of CE to cells via this receptor and may compromise the efficiency of sterol balancing pathways such as reverse cholesterol transport.

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Crossref · 10.1074/jbc.m008725200

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Authors
Greene, D. J., Skeggs, J. W., & Morton, R. E.
Affiliations
Cleveland Clinic (US)
Corresponding author
Morton, Richard E.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-02
Volume
276
Issue
7
Pages
4804-4811
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2053088392
Cited by
133
References
52
Citations by year
2025: 3 · 2023: 3 · 2022: 6 · 2021: 2 · 2020: 5 · 2019: 5 · 2018: 4 · 2017: 7 · 2016: 5 · 2015: 5 · 2014: 7 · 2013: 12 · 2012: 8
FWCI
7.54
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (R01HL060934, HL60934)
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
Keywords
high-density lipoprotein, scavenger receptor class B type I, cholesteryl ester uptake, triglyceride content, HDL lipid composition, selective uptake, reverse cholesterol transport, sterol balance, hyperlipidemia, receptor overexpression
MeSH terms
Animals, Biological Transport, Cell Line, Cholesterol Esters, Humans, Lipoproteins, HDL, Membrane Proteins, Receptors, Immunologic, Substrate Specificity, Transfection, Triglycerides, Receptors, Lipoprotein, CD36 Antigens, COS Cells, Receptors, Scavenger, Scavenger Receptors, Class B

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