Cited by 73Cholesterol and Lipid MetabolismLipoproteins and Cardiovascular HealthLipid metabolism and disorders

LDL and HDL enriched in triglyceride promote abnormal cholesterol transport

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Skeggs, Josephine W., Morton, Richard E.·2002·Journal of Lipid Research

Abstract

Hypertriglyceridemia induces multiple changes in lipoprotein composition. Here we investigate how one of these modifications, triglyceride (TG) enrichment, affects HDL and LDL function when this alteration occurs under conditions in which more polar components can naturally re-equilibrate. TG-enriched lipoproteins were produced by co-incubating VLDL, LDL, and HDL with cholesteryl ester (CE) transfer protein. The resulting 2.5-fold increase in TG/CE ratio did not measurably alter the apoprotein composition of LDL or HDL, or modify LDL size. HDL mean diameter increased slightly from 9.1 to 9.4 nm. Modified LDL was internalized by fibroblasts normally, but its protein was degraded much less efficiently. This likely reflects an aberrant apolipoprotein B (apoB) conformation, as suggested by its resistance to V8 protease digestion and altered LDL electrophoretic mobility. TG-enriched LDL ineffectively down-regulated cholesterol biosynthesis compared with control LDL at the same protein concentration, but was equivalent in sterol regulation when compared on a cholesterol basis. TG-enriched HDL promoted greater net cholesterol efflux from cholesterol-loaded J774 cells. However, cholesterol associated with TG-enriched HDL was inefficiently esterified by lecithin:cholesterol acyltransferase, and TG-enriched HDLs were poor donors of CE to HepG2 hepatocytes by selective uptake. We conclude that TG-enrichment, in the absence of other significant alterations in lipoprotein composition, is sufficient to alter both cholesterol delivery and removal mechanisms. Some of these abnormalities may contribute to increased coronary disease in hypertriglyceridemia.

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Crossref · 10.1194/jlr.m100431-jlr200

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Authors
Skeggs, J. W., & Morton, R. E.
Affiliations
Cleveland Clinic (US)
Corresponding author
Morton, Richard E.
Venue
Journal of Lipid Research
Publisher
Elsevier BV
Published
2002-08
Volume
43
Issue
8
Pages
1264-1274
ISSN
0022-2275 (ISSN-L)
OpenAlex
W2308761634
Cited by
73
References
63
Citations by year
2026: 1 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 4 · 2021: 2 · 2020: 6 · 2019: 5 · 2018: 1 · 2017: 1 · 2016: 3 · 2015: 6 · 2014: 2 · 2013: 5 · 2012: 5
FWCI
1.27
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 (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
hypertriglyceridemia, low-density lipoprotein, HDL cholesterol, cholesterol transport, cholesteryl ester transfer protein, cholesterol biosynthesis, cholesterol efflux, lecithin:cholesterol acyltransferase, cholesteryl ester uptake, coronary disease
MeSH terms
Biological Transport, Esterification, Humans, Phosphatidylcholine-Sterol O-Acyltransferase, Cholesterol, HDL, Cholesterol, LDL, Triglycerides

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