Cited by 144Lipid metabolism and disordersLipid metabolism and biosynthesisCholesterol and Lipid Metabolism

Apolipoprotein E Effectively Inhibits Lipoprotein Lipase-mediated Lipolysis of Chylomicron-like Triglyceride-rich Lipid Emulsions and

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Rensen, Patrick C.N., van Berkel, Theo J.C.·1996·Journal of Biological Chemistry

Abstract

Apolipoprotein E (apoE) is an important determinant for the liver uptake of triglyceride-rich lipoproteins and emulsions by the remnant receptor. In the current study, we assessed an additional role of apoE as modulator of the metabolism of triglyceride-rich lipoproteins in vitro and in vivo. Glycerol tri[3H]oleate [14C]cholesteryl oleate double-labeled triglyceride-rich emulsions were injected into fasted rats. The serum half-life of glycerol tri[3H]oleate was 3-fold faster (5.4 min) than that of [14C]cholesteryl oleate (16.7 min), confirming lipoprotein lipase (LPL)-mediated processing. To establish a specific effect of apoE on emulsion lipolysis rather than liver uptake, rats were functionally hepatectomized, and hypo(apo)lipoproteinemia was induced by 17alpha-ethinyl estradiol treatment. An apoE concentration-dependent inhibition of emulsion-triglyceride hydrolysis was observed, reaching a 14.8-fold increased half-life of glycerol tri[3H]oleate as compared with that in the absence of exogenous apoE. The mechanism and specificity of the effect of apoE on emulsion lipolysis by purified LPL was assessed in vitro. Addition of apoE to glycerol tri[3H]oleate-labeled emulsions led to a concentration-dependent inhibition of [3H]oleate release (9.5% residual LPL activity at 60 microg/ml apoE), while apoA-I was ineffective. The inhibitory effect of apoE was not abolished by reductive methylation of lysine residues, whereas selective modification of arginine residues by 1,2-cyclohexadione completely cancelled the inhibitory effect of apoE. It is concluded that apoE can specifically inhibit the LPL-mediated hydrolysis of emulsion triglycerides both in vitro and in vivo, and that arginine residues in apoE are essential for this effect. We suggest that in addition to its role in receptor recognition, apoE also modulates the LPL-mediated processing of triglyceride-rich lipoproteins.

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Crossref · 10.1074/jbc.271.25.14791

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  • An excess of APOE on VLDL particles can hinder their lipolysis, resulting in elevated plasma triglyceride levels.

    “Additionally, an excess of APOE on VLDL particles can hinder their lipolysis [34], resulting in elevated plasma triglyceride levels.”

    From Analysis of early effects of human APOE isoforms on Alzheimer’s disease and type III hyperlipoproteinemia pathways using knock-in rat models with humanized APP and APOE (2024) · cites this paper as [34]

    The paper reports that apoE content was inversely correlated with the lipolysis rate of VLDL in vitro (background passage labeled Abstract; page unavailable). Its own in-vivo experiments found inhibited lipolysis of apoE-enriched chylomicron-like emulsions, not VLDL. The paper suggests a role in regulating plasma triglycerides but does not establish that excess apoE on VLDL elevates plasma triglyceride levels. (LLM, conf=0.83)

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  • In vessels, apoE on VLDL and chylomicron particles competitively inhibits triglyceride degradation processing by lipoprotein lipase (LPL) promoted by apoC-II and apoA-V.

    “Meanwhile, in vessels, apoE on VLDL and chylomicron particles competitively inhibits triglyceride degradation processing by lipoprotein lipase (LPL) promoted by apoC-II and apoA-V20).”

    From Impact of Apolipoprotein E Variants: A Review of Naturally Occurring Variants and Clinical Features (2025) · cites this paper as [20]

    The ‘Effect of ApoE on LPL Activity in Vitro’ section (page unavailable) reports that apoE inhibited LPL-mediated triglyceride hydrolysis in chylomicron-like emulsions even when apoC-II was present. The Discussion (page unavailable) describes supporting experiments in rats, but the paper does not establish competitive inhibition by apoE on native VLDL and chylomicrons, or address apoA-V’s role in promoting lipolysis. (LLM, conf=0.88)

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  • The insufficiency of LPL appears to result from inhibition of this enzyme by apoE, which accumulates in VLDL/IDL/LDL-size lipoprotein particles.

    “As reported previously ( 36,37 ), the insuffi ciency of LPL appears to result from inhibition of this enzyme by apoE, which accumulates in VLDL/IDL/LDL-size lipoprotein particles.”

    From Molecular etiology of a dominant form of type III hyperlipoproteinemia caused by R142C substitution in apoE4 (2011) · cites this paper as [37]

    The paper concludes that apoE inhibits LPL-mediated hydrolysis of chylomicron-like emulsion triglycerides in vitro and in vivo. It also says VLDL and chylomicrons become enriched in apoE during lipolysis, but the cited passages do not establish that apoE accumulation in VLDL/IDL/LDL-size particles causes the particular LPL insufficiency described here. Page numbers are unavailable in our copy. (LLM, conf=0.85)

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Research works printed but not linked: 3

  1. Beisiegel, U., Weber, W., and Bengtsson-Olivecrona, G. (1991) Proc. Natl. Acad. Sci. U. S. A. 88, 8342-8346
  2. Vogel, T., Weisgraber, K. H., Zeevi, M. I., Ben-Artzi, H. B., Levanon, A. Z., Rall, S. C., Jr., Innerarity, T. L., Hui, D. Y., Taylor, J. M., Kanner, D., Yavin, Z., Amit, B., Aviv, H., Gorecki, M., and Mahley, R. W. (1985) Proc. Natl. Acad. Sci. U. S. A. 82, 8696 -8700
  3. Peterson, J., Bihain, B. E., Bengtsson-Olivecrona, G., Deckelbaum, R. J., Carpentier, Y. A., and Olivecrona, T. (1990) Proc. Natl. Acad. Sci. U. S. A. 87, 909 -913

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Authors
Rensen, P. C. N., & van Berkel, T. J. C.
Affiliations
Leiden University (NL)
Corresponding author
Rensen, Patrick C.N.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1996-06
Volume
271
Issue
25
Pages
14791-14799
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2134193555
Cited by
144
References
77
Citations by year
2025: 3 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 4 · 2020: 3 · 2019: 8 · 2018: 3 · 2017: 1 · 2016: 2 · 2015: 3 · 2014: 7 · 2013: 4 · 2012: 4
FWCI
9.58
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
apolipoprotein E, lipoprotein lipase, triglyceride-rich lipoproteins, lipolysis, lipolysis inhibition, arginine residues, hepatectomy, apolipoprotein A-I, lysine methylation, serum half-life
MeSH terms
Animals, Apolipoproteins E, Cholesterol Esters, Chylomicrons, Emulsions, Fasting, Half-Life, Hepatectomy, Humans, Kinetics, Lipolysis, Lipoprotein Lipase, Liver, Male, Recombinant Proteins, Time Factors, Triglycerides, Triolein, Tritium, Mutagenesis, Site-Directed, Rats, Wistar, Point Mutation, Rats

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